Detachable spraying assembly and pressure stabilizer

Abstract

The utility model is suitable for the technical field of nuclear power station pressure control, and provides a detachable spraying assembly and a pressure stabilizer, the detachable spraying assembly comprises a spraying connecting pipe, a thermal shock prevention sleeve, a spray head connecting pipe and a spray head, a spraying cavity is formed in the spraying connecting pipe, and a first channel communicating the spraying cavity with the external space is formed in the spraying connecting pipe; the first end of the thermal shock prevention sleeve is arranged in the first channel, a gap is formed between the first end of the thermal shock prevention sleeve and the inner wall of the spraying connecting pipe, the second end of the thermal shock prevention sleeve is arranged in the spraying cavity, the spray head connecting pipe is arranged in the spraying cavity, the thermal shock prevention sleeve is arranged in a sleeved mode, the spray head connecting pipe is detachably connected with the second end of the thermal shock prevention sleeve, and the spray head is arranged in the spraying cavity. The nozzle connecting pipe is communicated with one end deviating from the first channel. According to the thermal shock prevention sleeve, the whole thermal shock prevention sleeve can be detached, when the thermal shock prevention sleeve is damaged or deformed, the whole thermal shock prevention sleeve is allowed to be detached and replaced more conveniently, the detachment and maintenance time can be shortened, and the operation safety of a unit is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pressure control of nuclear power plants, in particular to a detachable spray assembly and a pressurizer. BACKGROUND

[0002] The pressurizer is one of the key equipment of the pressurized water reactor nuclear power plant. During the normal operation of the nuclear power plant, the pressurizer controls the pressure of the primary loop system by heating or cooling the water in it, so that the pressure of the primary loop system is maintained within a relatively stable range. This is crucial to ensure the safe operation of the reactor, because fluctuations in pressure can affect the power output and safety of the reactor.

[0003] When the pressurizer is in normal operation, its lower part is filled with water and its upper part is filled with steam. A spray head and an electric heater are provided in the pressurizer. The electric heater is used to heat the water in the pressurizer, which will vaporize and increase the pressure. The cooler coolant from the primary loop is sprayed out of the pressurizer spray head, and the steam in the upper part of the pressurizer will partially condense, thereby reducing the pressure.

[0004] A heat shock protection sleeve is provided in the pressurizer spray connection pipe to prevent excessive thermal stress on the spray connection pipe, heat shock protection sleeve, etc. when the cooler coolant from the primary loop frequently flows into the pressurizer.

[0005] The heat shock protection sleeve in the pressurizer spray connection pipe is relatively thin in wall thickness, and is subject to thermal shock. During the operation of the pressurizer, there is a risk of deformation and damage. The existing heat shock protection sleeve and spray connection pipe are connected by welding. If the heat shock protection sleeve is damaged, it is difficult to replace, and long-term maintenance and replacement will seriously affect the operation of the unit. CONTENT OF THE INVENTION

[0006] The purpose of the embodiments of the present application is to provide a detachable spray assembly, which aims to solve the technical problems of inconvenient replacement of the heat shock protection sleeve in the existing pressurizer and impact on the operation of the unit.

[0007] The embodiments of the present application are implemented as follows: a detachable spray assembly, comprising:

[0008] A spray connection pipe is provided with a spray cavity inside, and a first channel is provided to communicate the spray cavity with the outside space;

[0009] A heat shock protection sleeve is provided, and the first end of the heat shock protection sleeve is arranged in the first channel and has a gap between the inner wall of the spray connection pipe, and the second end of the heat shock protection sleeve is arranged in the spray cavity;

[0010] A spray head connection pipe is arranged in the spray cavity and sleeved on the heat shock protection sleeve, and the spray head connection pipe and the second end of the heat shock protection sleeve are detachably connected;

[0011] A spray head is arranged in the spray cavity and is in communication with one end of the spray head connecting pipe which is away from the first channel.

[0012] In one embodiment, an inner thread section is arranged on the inner wall of the spray head connecting pipe, and an outer thread section is arranged on the second end of the thermal shock resistant sleeve, the inner thread section being engaged with the outer thread section.

[0013] In one embodiment, a first thickened portion is arranged on the inner wall of the spray head connecting pipe and protrudes towards the thermal shock resistant sleeve, and the inner thread section is arranged on the first thickened portion; and / or, a second thickened portion is arranged on the second end of the thermal shock resistant sleeve and protrudes towards the spray head connecting pipe, and the outer thread section is arranged on the second thickened portion.

[0014] In one embodiment, the side of the spray head connecting pipe and the thermal shock resistant sleeve which faces the spray head is connected by spot welding.

[0015] In one embodiment, a second annular space is formed between the spray head connecting pipe and the thermal shock resistant sleeve, and a plurality of flow-through holes are arranged on the spray head connecting pipe and are in communication with the second annular space and the spray cavity, the flow-through holes being arranged to tilt towards the spray head in a direction away from the thermal shock resistant sleeve.

[0016] In one embodiment, the second end of the thermal shock resistant sleeve further comprises a locking portion arranged on the side of the outer thread section which faces the spray head, and the outer peripheral surface of the locking portion is a non-cylindrical surface.

[0017] In one embodiment, the spray head connecting pipe further comprises a connecting section arranged on the side of the inner thread section which faces the spray head, and the outer wall of the connecting section is threadedly engaged with the inner wall of the spray head.

[0018] In one embodiment, a boss is arranged on the outer wall of the first end of the thermal shock resistant sleeve, and the gap between the outer wall of the boss and the inner wall of the spray connecting pipe is greater than 0 and less than or equal to 1 mm.

[0019] In one embodiment, the spray connecting pipe comprises a safety end and a spray connecting pipe body which are connected to each other, the spray cavity is arranged on the spray connecting pipe body, and the first channel is arranged on the spray connecting pipe body and the safety end; the safety end and the spray connecting pipe body are connected by welding; the distance between the boss and the weld joint between the safety end and the spray connecting pipe body is 15-25 mm.

[0020] Another object of the present application is to provide a stabilizer comprising the detachable spray assembly as described in the above embodiments.

[0021] The detachable spray assembly and the pressure stabilizer have the beneficial effects that:

[0022] The detachable spray assembly has a gap between the first end of the heat shock protection sleeve and the inner wall of the spray connecting pipe, and the second end of the heat shock protection sleeve is detachably connected with the spray head connecting pipe, so that the heat shock protection sleeve can be integrally detached. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] Figure 1 is a structural schematic diagram of the detachable spray assembly provided by the embodiments of the present application;

[0025] Figure 2 is Figure 1 is an enlarged view of A in FIG. 1;

[0026] Figure 3 is Figure 2 is an enlarged view of B in FIG. 1;

[0027] Figure 4 is a structural schematic diagram of the spray connecting pipe in the detachable spray assembly provided by the embodiments of the present application.

[0028] The meanings of the marks in the drawings are as follows:

[0029] 100 - detachable spray assembly;

[0030] 1 - spray connecting pipe, 10 - spray cavity, 11 - safety end, 111 - resisting step wall, 12 - spray connecting pipe body, 15 - first annular weld, 16 - anti-corrosion layer, 18 - first channel;

[0031] 3 - spray head connecting pipe, 30 - flow-through hole, 31 - first thickened part, 32 - connecting section, 33 - internal thread section;

[0032] 4 - spray head;

[0033] 5 - fastening block;

[0034] 6 - heat shock protection sleeve, 60 - second channel, 61 - second thickened part, 62 - external thread section, 63 - boss, 64 - locking part;

[0035] 81 - first annular space, 82 - second annular space;

[0036] 91 - second annular weld, 92 - dot weld. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application.

[0038] It should be noted that when a component is referred to as "fixed to" or "disposed on" another component, it can be directly or indirectly fixed or disposed on the other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to the other component. The terms "upper", "lower", "left", "right", etc. indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present patent. The terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implying the number of technical features. The meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0039] In order to illustrate the technical solutions described in the present application, the following will be described in detail in conjunction with specific drawings and embodiments.

[0040] The embodiment of the present application first provides a stabilizer (not shown), which comprises a container body and a plurality of spray assemblies fixed on the container body. The container body is internally provided with a containing space, and the containing space is provided with a heater and the like. One end of the spray assembly is in communication with the containing space, and the other end is in communication with a loop system for adjusting the pressure of the loop system.

[0041] Please refer to Figure 1 The spray assembly described above is a detachable spray assembly 100.

[0042] Specifically, please refer to Figure 1 The detachable spray assembly 100 comprises a spray connecting pipe 1, a heat shock resistant sleeve 6, a spray head connecting pipe 3 and a spray head 4. As Figure 4 The spray connecting pipe 1 is internally provided with a spray cavity 10, and the spray connecting pipe 1 is further provided with a first channel 18 in communication with the spray cavity 10 and the outside space; as Figure 2 and Figure 3As shown in the figure, the heat shock sleeve 6 has a second channel 60 passing through the inside of the heat shock sleeve 6, the first end of the heat shock sleeve 6 is arranged in the first channel 18 and has a gap between the inner wall of the spray connecting pipe 1, and the second end is arranged in the spray cavity 10. Figure 1 and Figure 2 As shown in the figure, the spray head connecting pipe 3 is arranged in the spray cavity 10 and is sleeved with the heat shock sleeve 6, one end of the spray head connecting pipe 3 is fixedly connected with the inner wall of the spray connecting pipe 1, and the other end of the spray head connecting pipe 3 is detachably connected with the second end of the heat shock sleeve 6. Figure 1 As shown in the figure, the spray head 4 is arranged in the spray cavity 10 and is in communication with the first end of the spray head connecting pipe 3 which is away from the first channel 18.

[0043] It can be understood that the gap between the first end of the heat shock sleeve 6 and the inner wall of the spray connecting pipe 1 has a single-side width H which is greater than 0, and does not include the case that H is 0 and the two are just attached together, please refer to Figure 3 As shown in the figure. That is, the heat shock sleeve 6 is not substantially fixedly connected with the inner wall of the spray connecting pipe 1.

[0044] The detachable spray assembly 100 provided by the embodiment of the present application has a gap between the first end of the heat shock sleeve 6 and the inner wall of the spray connecting pipe 1, and the second end is detachably connected with the spray head connecting pipe 3, so that the whole heat shock sleeve 6 can be detached. When the heat shock sleeve 6 is damaged or deformed, the heat shock sleeve 6 can be conveniently detached and replaced as a whole, which is beneficial to reduce the time for disassembly and maintenance and ensure the safe operation of the unit.

[0045] The above-mentioned external space refers to the space outside the spray connecting pipe 1. In the pressure stabilizer, the external space refers to a primary loop system.

[0046] In a specific application, when the heat shock sleeve 6 needs to be detached, the spray head 4 is detached from the other end of the spray head connecting pipe 3, then the second end of the heat shock sleeve 6 is detached from the spray head connecting pipe 3, and the heat shock sleeve 6 can be taken out.

[0047] Please refer to Figure 4 As shown in the figure, the spray connecting pipe 1 comprises a safety end 11 and a spray connecting pipe body 12 which are connected with each other, the spray cavity 10 is arranged on the spray connecting pipe body 12, the first channel 18 is arranged on the spray connecting pipe body 12 and the safety end 11, and the safety end 11 and the spray connecting pipe body 12 are fixedly connected.

[0048] More specifically, the safety end 11 and the spray connecting pipe body 12 are weldedly connected. As shown in Figure 1 , Figure 2 and Figure 4As shown, the end face of the safety end 11 on the side facing the spray head 4 is welded to the end face of the spray pipe body 12 on the side away from the spray head 4, and a first annular weld 15 is formed between the two.

[0049] The first end of the thermal shock protection sleeve 6 extends to the safety end 11, as shown. Figure 1 and Figure 2 As shown, a stop step wall 111 is arranged on the inner wall of the safety end 11, as shown. Figure 4 The stop step wall 111 is used to limit the end face of the first end of the thermal shock protection sleeve 6, so as to prevent the thermal shock protection sleeve 6 from moving in the first channel 18 away from the spray head 4.

[0050] During the operation of the detachable spray assembly 100, the working medium in the spray cavity 10 directly contacts the inner wall of the spray pipe body 12. As shown, Figure 1 , Figure 2 and Figure 4 In order to reduce the corrosion of the working medium to the inner wall of the spray pipe body 12, in one embodiment, an anti-corrosion layer 16 is arranged on the inner wall of the spray pipe body 12.

[0051] The anti-corrosion layer 16 can be stainless steel overlaying or other material coating capable of resisting the corrosion of the working medium.

[0052] The end of the spray head connecting pipe 3 away from the spray head 4 is welded to the inner wall of the spray pipe body 12. As shown, Figure 2 The end of the spray head connecting pipe 3 away from the spray head 4 and the inner wall of the spray pipe body 12 form a second annular weld 91.

[0053] As shown, Figure 2 and Figure 3 Due to the gap between the outer wall of the first end of the thermal shock protection sleeve 6 and the inner wall of the spray pipe 1, a first annular space 81 is formed therebetween. When the low-temperature coolant from the primary loop enters the thermal shock protection sleeve 6 from the first channel 18, it can enter the first annular space 81 through the first end of the thermal shock protection sleeve 6, thus causing corrosion, thermal shock, etc. to the inner wall of the spray pipe body 12 and the outer wall of the thermal shock protection sleeve 6. Therefore, the width H of the gap between the outer wall of the first end of the thermal shock protection sleeve 6 and the inner wall of the spray pipe 1 should be minimized.

[0054] In one embodiment, the width H of the gap between the outer wall of the first end of the thermal shock protection sleeve 6 and the inner wall of the spray pipe 1 is greater than 0 and less than or equal to 1 mm. Alternatively, the width H of the gap between the outer wall of the first end of the thermal shock protection sleeve 6 and the inner wall of the spray pipe 1 is greater than 0 and less than or equal to 0.5 mm.

[0055] As shown, Figure 2 andFigure 3 As shown, in one embodiment, the outer wall of the first end of the thermal shock protection sleeve 6 is provided with a boss 63, and a gap is formed between the boss 63 and the inner wall of the spray connection pipe 1. The purpose of this design is that, on the one hand, the boss 63 is essentially a thickened area, and when non-destructive testing is performed on the first annular weld 15 between the safety end 11 and the spray connection pipe body 12, the boss 63 has clearer imaging and larger size, which can be used as a non-destructive reference, and in turn, the boss 63 can also be detected at the same time, which is beneficial to determine whether the thermal shock protection sleeve 6 is detached or deformed; on the other hand, in order to avoid the low-temperature coolant entering the first annular space 81, the width of the first annular space 81 can be reduced by reducing the gap between the boss 63 and the inner wall of the spray connection pipe 1, and thus, the boss 63 is separately processed, which is easier to control the size, so that the spray connection pipe 1 is easier to achieve small-gap fitting, that is, the gap width H between the outer wall of the first end of the thermal shock protection sleeve 6 and the inner wall of the spray connection pipe 1 can be determined by the gap width between the outer wall of the boss 63 and the inner wall of the spray connection pipe 1, as shown in Figure 3 As shown.

[0056] For example, the gap width H between the outer wall of the boss 63 and the inner wall of the spray connection pipe 1 is less than or equal to 0.5 mm; alternatively, the gap width H between the outer wall of the boss 63 and the inner wall of the spray connection pipe 1 is less than or equal to 0.4 mm; alternatively, the gap width H between the outer wall of the boss 63 and the inner wall of the spray connection pipe 1 is less than or equal to 0.3 mm.

[0057] The boss 63 can be a closed structure or a plurality of convex points distributed along the circumference of the thermal shock protection sleeve 6. Alternatively, in order to facilitate processing and manufacturing, the boss 63 is a closed structure.

[0058] In addition, the boss 63 and the inner wall of the spray connection pipe 1 are not substantially fixedly connected, but form a gap. When the low-temperature coolant enters the thermal shock protection sleeve 6, it will inevitably cause the thermal shock protection sleeve 6 to vibrate, at this time, the first end of the thermal shock protection sleeve 6 is supported on the inner wall of the spray connection pipe 1 by the boss 63, and the second end is fixed by the nozzle connecting pipe 3. Through the small-gap fitting between the boss 63 and the inner wall of the spray connection pipe 1, the thermal shock protection sleeve 6 is uniformly and stably supported, which can avoid the problem that the vibration amplitude of the thermal shock protection sleeve 6 is too large due to the cantilever structure, and thus the thermal shock protection sleeve 6 is damaged.

[0059] In addition, as shown in Figure 2 The distance between the boss 63 and the first annular weld 15 between the safety end 11 and the spray connection pipe body 12 is 15-25 mm. The boss 63 and the first annular weld 15 are kept at a sufficient distance, which can avoid affecting the detection of the first annular weld 15 during non-destructive testing.

[0060] As shown in Figure 2 , the boss 63 can be in small clearance fit with the inner wall of the safety end 11, that is, the boss 63 is located at the side of the first annular weld 15 close to the nozzle 4; or, the boss 63 can be in small clearance fit with the inner wall of the spray connector body 12, that is, the boss 63 is located at the side of the first annular weld 15 away from the nozzle 4.

[0061] As shown in Figure 2 , in one embodiment, the nozzle connecting pipe 3 and the second end of the thermal shock resistant sleeve 6 are in threaded connection.

[0062] Specifically, the inner wall of the nozzle connecting pipe 3 is provided with an inner threaded section 33, and the second end of the thermal shock resistant sleeve 6 is provided with an outer threaded section 62, and the inner threaded section 33 and the outer threaded section 62 are engaged. By using the threaded connection to fix the thermal shock resistant sleeve 6 on the nozzle connecting pipe 3, the connection strength is ensured and the disassembly and assembly are facilitated.

[0063] More specifically, as shown in Figure 2 , the inner wall of the nozzle connecting pipe 3 is provided with a first thickened portion 31 protruding towards the thermal shock resistant sleeve 6, and the inner threaded section 33 is arranged on the first thickened portion 31. And, the second end of the thermal shock resistant sleeve 6 is provided with a second thickened portion 61 protruding towards the nozzle connecting pipe 3, and the outer threaded section 62 is arranged on the second thickened portion 61.

[0064] The purpose of such arrangement is to realize that only a part of the nozzle connecting pipe 3 and the second end of the thermal shock resistant sleeve 6 are connected together, and the other part can be separated, by the arrangement of the first thickened portion 31 and the second thickened portion 61. Thus, as shown in Figure 2 , a second annular space 82 is formed inside the nozzle connecting pipe 3 and outside the thermal shock resistant sleeve 6. Of course, at the side of the second annular space 82 away from the nozzle 4, it is also in communication with the first annular space 81. The first annular space 81 is a part of the first channel 18, and the second annular space 82 is a part of the spray cavity 10.

[0065] In other alternative embodiments, the arrangement of the first thickened portion 31 or the second thickened portion 61 can be selectively cancelled.

[0066] The second annular space 82 is arranged to separate the interior of the thermal shock protection sleeve 6 from the spray cavity 10 to some extent. The second annular space 82 serves as a buffer space for temperature. When the low-temperature coolant from the primary loop system enters the first channel 18 of the spray connector 1 and enters the thermal shock protection sleeve 6, the low-temperature coolant can be prevented from directly transferring to the spray connector 1, and when the low-temperature coolant from the primary loop system enters the spray cavity 10 through the spray head 4, the low-temperature coolant can also be prevented from immediately contacting the portion of the spray connector 1 located inside the spray head connecting pipe 3, thereby preventing the spray connector 1 from being subjected to a large thermal shock and thermal fatigue.

[0067] As shown in Figure 2 , the side of the spray head connecting pipe 3 and the thermal shock protection sleeve 6 facing the spray head 4 is connected by spot welding. The side of the spray head connecting pipe 3 and the thermal shock protection sleeve 6 facing the spray head 4 is connected by one or more spot welds 92, which can ensure that the spray head connecting pipe 3 and the thermal shock protection sleeve 6 do not rotate during operation and can be easily disassembled. Specifically, when the thermal shock protection sleeve 6 needs to be disassembled, the spray head 4 is disassembled, and the spot welds 92 are removed, such as being ground off, to allow the spray head connecting pipe 3 and the thermal shock protection sleeve 6 to be rotated in the opposite direction and disassembled.

[0068] As shown in Figure 2 , the spray head connecting pipe 3 is provided with a plurality of flow-through holes 30 that communicate the second annular space 82 and the spray cavity 10, and the flow-through holes 30 are inclined toward the spray head 4 in a direction away from the thermal shock protection sleeve 6. The flow-through holes 30 are used to allow the condensed liquid in the second annular space 82 to be discharged.

[0069] The inclination angle of the flow-through holes 30 relative to the axial direction of the thermal shock protection sleeve 6 is 30° to 60°. The diameter of the flow-through holes 30 is 5 mm to 20 mm. According to the pressure control requirements, the total flow-through area of the flow-through holes 30 should be 10% to 30% of the flow-through area of the thermal shock protection sleeve 6.

[0070] It can be understood that, according to the specific operation conditions in a nuclear power plant, the data such as the unit flow volume of the coolant from the primary loop system flowing into the surge tank are different, and the diameter and total flow-through area of the flow-through holes 30 can be set to other ranges, as long as the flow-through holes 30 allow the condensed liquid in the second annular space 82 to be discharged in time and do not allow the condensed liquid to accumulate too much in the second annular space 82.

[0071] Please refer to Figure 1 and Figure 2As shown, the second end of the thermal shock protection sleeve 6 further comprises a locking portion 64 arranged on the side of the outer threaded section 62 facing the shower head 4, and the outer peripheral surface of the locking portion 64 is a non-cylindrical surface. The locking portion 64 is used as a force applying position when rotating the thermal shock protection sleeve 6. For example, the locking portion 64 is a hexagonal head, and the outer peripheral surface thereof is a hexagonal prism surface. By cooperating with an inner hexagonal wrench, the thermal shock protection sleeve 6 can be conveniently rotated to facilitate the dismounting or mounting of the thermal shock protection sleeve 6.

[0072] As shown in Figure 2 The shower head connecting pipe 3 further comprises a connecting section 32 arranged on the side of the inner threaded section 33 facing the shower head 4, and the connecting section 32 is fixedly connected with the shower head 4.

[0073] Specifically, the connecting section 32 and the shower head 4 can be threadedly connected. For example, the outer wall of the connecting section 32 is threadedly engaged with the inner wall of the shower head 4.

[0074] In addition, please continue to refer to Figure 2 The detachable shower assembly 100 further comprises a fastening block 5, one end of the fastening block 5 is fixedly connected with the shower head connecting pipe 3, and the other end is fixedly connected with the shower head 4. The arrangement of the fastening block 5 can also prevent the connecting section 32 and the shower head 4 from being loosened.

[0075] Specifically, one end of the fastening block 5 can be welded with the outer wall of the shower head 4, and the other end can be welded with the outer wall of the shower head 4. Since the fastening block 5, the outer wall of the shower head 4 connected with the fastening block 5, and the outer wall of the shower head 4 are all exposed in the shower cavity 10, when the shower head 4 needs to be dismounted, the operation space is large, and the fastening block 5 can be conveniently dismounted.

[0076] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A demountable spray assembly characterized by, The spray assembly comprises: a spray connector, which is internally provided with a spray cavity and is provided with a first channel communicating the spray cavity with an external space; a thermal shock resistant sleeve, a first end of the thermal shock resistant sleeve being arranged in the first channel and having a gap with an inner wall of the spray connector, a second end of the thermal shock resistant sleeve being arranged in the spray cavity; a spray head connecting pipe, which is arranged in the spray cavity, is sleeved with the thermal shock resistant sleeve, and is detachably connected with the second end of the thermal shock resistant sleeve; a spray head, which is arranged in the spray cavity and is in communication with an end of the spray head connecting pipe away from the first channel.

2. The modular spray assembly of claim 1, wherein, An inner thread section is arranged on an inner wall of the spray head connecting pipe, an outer thread section is arranged on the second end of the thermal shock resistant sleeve, and the inner thread section is engaged with the outer thread section.

3. The modular spray assembly of claim 2, wherein, A first thickened portion protruding towards the thermal shock resistant sleeve is arranged on the inner wall of the spray head connecting pipe, and the inner thread section is arranged on the first thickened portion; and / or a second thickened portion protruding towards the spray head connecting pipe is arranged on the second end of the thermal shock resistant sleeve, and the outer thread section is arranged on the second thickened portion.

4. The modular spray assembly of claim 3, wherein, The side of the spray head connecting pipe and the thermal shock resistant sleeve facing the spray head is connected through spot welding.

5. The modular spray assembly of claim 2, wherein, A second annular space is formed between the spray head connecting pipe and the thermal shock resistant sleeve, a plurality of flow-through holes communicating the second annular space with the spray cavity are arranged on the spray head connecting pipe, and the flow-through holes are arranged to be inclined towards the spray head in a direction away from the thermal shock resistant sleeve.

6. The modular spray assembly of claim 2, wherein, The second end of the thermal shock resistant sleeve further comprises a locking portion arranged on the side of the outer thread section facing the spray head, and an outer peripheral surface of the locking portion is a non-cylindrical surface.

7. The demountable spray assembly of any one of claims 2 to 6, wherein, The spray head connecting pipe further comprises a connecting section arranged on the side of the inner thread section facing the spray head, and an outer wall of the connecting section is threadedly engaged with an inner wall of the spray head.

8. The demountable spray assembly of any one of claims 1 to 6, wherein, A boss is arranged on an outer wall of the first end of the thermal shock resistant sleeve, and the gap between the outer wall of the boss and the inner wall of the spray connector is greater than 0 and less than or equal to 1 mm.

9. The modular spray assembly of claim 8, wherein, The spray connector comprises a safety end and a spray connector body connected with each other, the spray cavity is arranged on the spray connector body, the first channel is arranged on the spray connector body and the safety end, the safety end and the spray connector body are weldedly connected, and the distance between the boss and the weld seam between the safety end and the spray connector body is 15-25 mm.

10. A voltage regulator characterized by comprising: The spray assembly comprises any one of the detachable spray assemblies according to claims 1-9.

Images