Production system of high-chromium-content super anti-corrosion heat-insulation oil casing for offshore oil and gas development

Abstract

The invention relates to a production system of a high-chromium-content super anti-corrosion heat-insulation oil casing for offshore oil and gas development. The production system comprises a placing mechanism, a heat-insulation oil casing conveying mechanism and a heat-insulation oil casing conveying mechanism, a dadoing mechanism for dadoing an outer pipe arm of the heat insulation oil casing is arranged on the placing mechanism; rotating and fixing mechanisms for rotating and fixing the heat insulation oil casing are symmetrically arranged at the front end and the rear end of the placing mechanism; one side of the rotating and fixing mechanism is provided with a thermal insulation oil sleeve temporary placing track for placing the thermal insulation oil sleeve subjected to the dadoing process; guide sliding rollers are arranged at the end part of the temporary track in parallel; an outer lining mechanism for thermally lining an anti-corrosion material on the heat insulation oil sleeve is arranged on an extension line of the guide sliding roller; and the general control device is electrically connected with the dadoing mechanism, the rotary fixing mechanism, the guide sliding roller and the outer lining mechanism. According to the production system of the high-chromium-content super anti-corrosion heat-insulation oil casing for ocean oil and gas development, the heat-insulation oil casing suitable for ocean oil and gas development is produced.

Description

Technical Field

[0001] This invention relates to the field of petroleum extraction technology, and in particular to a production system for high-chromium super anti-corrosion and heat-insulating oil casing for offshore oil and gas development. Background Technology Oil extraction involves first excavating where oil is stored, and then extracting it. During this process, oil and gas flow from the reservoir to the bottom of the well and rise from the bottom to the wellhead.

[0002] The ocean, vast in area and rich in resources, contains over 34% of the Earth's oil and natural gas. Of this, approximately 44% lies buried more than 300 meters below the surface, while in my country's waters with an average depth exceeding 1,000 meters, oil and gas resources account for 55%. In recent years, my country has also been developing its offshore oil and gas sector.

[0003] Oil extraction includes heavy oil / asphalt and natural gas. Heavy oil / asphalt and natural gas extraction have become the main production sources for domestic and international oil companies. Insulated oil casing is commonly used in heavy oil extraction. The structure of an insulated oil casing is a double-layered pipe with a vacuum in the middle, which can maintain the temperature of the heavy oil / asphalt inside the pipe, ensuring its good fluidity.

[0004] Compared to land-based oil and gas development, offshore oil and gas development requires consideration of corrosion and damage prevention for the insulated oil casing due to the presence of seawater in the jacket section. Summary of the Invention

[0005] To address the technical problems existing in the background art, the present invention provides a production system for high-chromium super anti-corrosion and heat-insulating oil casing for marine oil and gas development, which produces heat-insulating oil casing suitable for marine oil and gas development.

[0006] The technical solution adopted by this invention is: A production system for high-chromium super corrosion-resistant and heat-insulating oil casing for offshore oil and gas development includes: A horizontally positioned placement mechanism for placing multiple heat-insulating oil sleeves side by side; The placement mechanism is equipped with a grooving mechanism that moves along the front-back direction to groove the outer tube arm of the heat insulation oil casing. The placement mechanism is symmetrically equipped with a screwing mechanism at both the front and rear ends for rotating and fixing the heat insulation oil casing. The screwing mechanism is provided with a temporary track on the side away from the placement mechanism for placing the heat insulation oil sleeve after the grooving process is completed. Guide rollers are arranged side by side at the ends of the temporary track; The guide roller is provided with an outer lining mechanism along its extension line in the front-to-back direction for heat-lining anti-corrosion material onto the heat-insulating oil casing. In addition, a central control device is electrically connected to the grooving mechanism, the spin-fixing mechanism, the guide roller, and the outer lining mechanism.

[0007] Furthermore, the placement mechanism includes: A horizontally arranged main warehouse is provided with a slide rail assembly, the slide rail assembly including at least two slide rails arranged on the left and right sides of the main warehouse, and a placement slot is provided in the middle of the main warehouse along the front-to-back direction, and multiple sets of placement slots are arranged along the left-to-right direction.

[0008] Furthermore, the grooving mechanism includes: A longitudinally moving gantry is slidably mounted on a slide rail assembly. A transversely moving telescopic tool holder is movably mounted on the longitudinally moving gantry. Multiple parallel planing tools are fixedly mounted on the transversely moving telescopic tool holder along the front-to-back direction. A control mechanism is provided at one end of the longitudinally moving gantry. The control mechanism is electrically connected to the central control device for controlling: The longitudinal gantry moves longitudinally along the front-to-back direction; The lateral telescopic tool holder moves laterally in the left-right direction and rises and falls in the up-down direction.

[0009] Furthermore, the screwing mechanism includes: A horizontally positioned base is provided, on which stroke cylinders and a support frame are fixedly mounted. Two sets of stroke cylinders are arranged side by side along the front-rear direction and are electrically connected to a central control device. A rotating roller is fixedly mounted on the stroke end of the rear stroke cylinder, and a driver is coaxially mounted on the rotating roller. The driver is electrically connected to the central control device. A lifting frame is fixedly mounted on the stroke end of the front stroke cylinder. An upper pressure roller is mounted on the upper end of the inner frame of the lifting frame. The support frame is shaped like an "A" and passes through the lifting frame. A lower support roller is rotatably mounted on the upper part of the support frame and is positioned directly below the upper pressure roller.

[0010] Furthermore, the stroke cylinder is configured as a stroke hydraulic cylinder, and a synchronizing valve is connected to the front and rear sets of stroke cylinders. The synchronizing valve is electrically connected to the main control device.

[0011] Furthermore, the temporary track extends in the left-right direction and has multiple tracks arranged in parallel in the front-back direction.

[0012] Furthermore, the outer liner mechanism includes: Longitudinal drive rollers used to drive the movement of the heat insulation oil casing; An extrusion mechanism used for supplying, melting, lining, and shaping the outer lining material; A cooling mechanism that uses an outer lining for cooling.

[0013] Furthermore, the longitudinal drive rollers are provided in two sets, respectively located on both sides of the extrusion mechanism and the cooling mechanism, and consist of a drive roller and a drive component. The drive roller is deflected in the horizontal direction to drive the heat insulation oil jacket to rotate and translate in the front-to-back direction; The drive component is electrically connected to the central control device.

[0014] Furthermore, the extrusion mechanism is disposed between two sets of longitudinal drive rollers, and includes: The inlet, injection port, melting tank, forming tube assembly, shaping tube assembly, and outlet are sequentially and coaxially connected. The inlet is used to introduce the heat insulation oil jacket, the injection port is used to replenish the outer lining material particles, the melting tank is used to extrude the molten outer lining material, the forming tube assembly is used to shape the outer circle of the outer lining material, the shaping tube assembly is used to cool and shape the surface of the outer lining material, and the outlet is used to lead out the heat insulation oil jacket. The feeding components, temperature measuring components, heating components, and extrusion drive components in the extrusion mechanism are all electrically connected to the central control device.

[0015] Furthermore, the cooling mechanism is located at the outlet end of the extrusion mechanism and includes: A water storage tank is located below the shaped pipe assembly. The water storage tank is connected to the water supply pipeline and the drainage pipeline. A circulating water pump is installed inside the water storage tank. The circulating water pump is electrically connected to the main control device. The outlet end of the circulating water pump is connected to a main drainage pipe. The lower end of the main drainage pipe is supported by a main pipe support leg. The main pipe support leg is fixedly connected to the water storage tank. Multiple drainage branch pipes are connected to the main drainage pipe. Spray heads are connected to the ends of the drainage branch pipes. A "Π"-shaped mounting bracket is fixedly installed on the upper side wall of the water storage tank. The spray heads are fixedly installed on the mounting bracket. An outer protective box is provided on the mounting bracket to prevent water sprayed from the spray heads from splashing out. The side wall of the outer protective box is provided with a downward-opening through groove for passing through a heat-insulating oil sleeve.

[0016] The advantages of the high-chromium super anti-corrosion and heat-insulating oil casing production system for marine oil and gas development of this invention are as follows: 1. Multiple heat-insulating oil sleeves are placed side by side using a placement mechanism; 2. The heat insulation oil casing is rotated and fixed by a screwing mechanism; 3. Grooving is performed on the outer tube arm of the heat insulation oil casing, which is fixed by the screwing mechanism on the placement mechanism, using the grooving mechanism. 4. The heat insulation oil casing with the grooved surface temporarily placed using a temporary track; 5. The heat insulation oil sleeve on the temporary track is fed into the outer lining mechanism by the guide roller; 6. Apply anti-corrosion material to the outer wall of the heat-insulating oil casing through the outer lining mechanism. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings required for the specific embodiments will be briefly introduced below. The accompanying drawings in the following description are embodiments of the present invention.

[0018] Figure 1 This is a general three-dimensional schematic diagram of a high-chromium super anti-corrosion and heat-insulating oil casing production system for marine oil and gas development, provided by an example of the present invention. Figure 2 This invention provides a three-dimensional schematic diagram of the placement mechanism and grooving mechanism of a high-chromium super anti-corrosion and heat-insulating oil casing production system for marine oil and gas development. Figure 3 This is a three-dimensional schematic diagram of the spun-locking mechanism of a high-chromium super anti-corrosion and heat-insulating oil casing production system for marine oil and gas development, provided by an example of the present invention. Figure 4 This is a three-dimensional schematic diagram of the outer lining mechanism of a high-chromium super anti-corrosion and heat-insulating oil casing production system for marine oil and gas development, provided by an example of the present invention. Figure 5 This is a three-dimensional schematic diagram of the extrusion mechanism of a high-chromium super anti-corrosion and heat-insulating oil casing production system for marine oil and gas development, provided by an example of the present invention. Figure 6 This invention provides a three-dimensional schematic diagram of the cooling mechanism of a high-chromium super anti-corrosion and heat-insulating oil casing production system for offshore oil and gas development. Figure 1 ; Figure 7 This invention provides a three-dimensional schematic diagram of the cooling mechanism of a high-chromium super anti-corrosion and heat-insulating oil casing production system for offshore oil and gas development. Figure 2 ; Figure 8 This invention provides a three-dimensional cross-sectional view of a high-chromium super corrosion-resistant and heat-insulating oil casing production system for offshore oil and gas development. Figure 1 ; Figure 9 This invention provides a three-dimensional cross-sectional view of a high-chromium super corrosion-resistant and heat-insulating oil casing production system for offshore oil and gas development. Figure 2 .

[0019] In the picture: 1. Placement mechanism 10. Main compartment; 11. Slide rail assembly; 12. Placement slot. 2. Grooving mechanism, 21. Longitudinal gantry; 22. Lateral telescopic tool holder; 23. Control mechanism. 3. Spinning mechanism, 30. Base; 31. Stroke cylinder; 32. Rotary roller; 33. Driver; 34. Lifting frame; 35. Upper pressure roller. 36. Support frame; 37. Lower support roller. 4. Temporary track, 5. Guide rollers, 6. Outer lining mechanism, 61. Longitudinal drive roller, 62. Extrusion mechanism; 621. Inlet pipe; 622. Inlet for dispensing; 623. Melting tank; 624. Forming tube assembly. 625. Fixed pipe assembly; 626. Pipe outlet. 63. Cooling mechanism; 630. Water storage tank; 631. Circulating water pump; 632. Drain main pipe; 633. Main pipe support. 634. Drainage branch pipe; 635. Sprinkler head; 636. Mounting bracket; 637. Outer protective box. Detailed Implementation

[0020] To more clearly and explicitly illustrate the specific objectives and implementation methods of this invention, a complete description of the technical solution of this invention will be provided below. The described embodiments are only a part of the embodiments of this invention, not all of them. Without creative effort, all other embodiments based on the embodiments described in this invention are within the protection scope of this invention.

[0021] This invention discloses a high-chromium-content super corrosion-resistant and heat-insulating oil casing production system for offshore oil and gas development, such as... Figure 1 As shown, it includes: The horizontally positioned placement mechanism 1 is used to place multiple heat-insulating oil sleeves side by side, such as... Figure 2 As shown, it includes: A horizontally arranged main compartment 10 is provided with a slide rail assembly 11. The slide rail assembly 11 includes at least two slide rails arranged on the left and right sides of the main compartment 10. A placement groove 12 is provided in the middle of the main compartment 10 along the front-to-back direction. Multiple sets of placement grooves 12 are arranged along the left-to-right direction.

[0022] The placement mechanism 1 is equipped with a grooving mechanism 2 that moves along the front-to-back direction, used to groove the outer tube arm of the heat insulation oil casing. Figure 2 As shown, it includes: A longitudinal gantry 21 is slidably mounted on a slide rail assembly 11. A transverse telescopic tool holder 22 is movably mounted on the longitudinal gantry 21. Multiple parallel planing tools are fixedly mounted on the transverse telescopic tool holder 22 along the front-back direction. A control mechanism 23 is provided at one end of the longitudinal gantry 21. The control mechanism 23 is electrically connected to a central control device and is used to control: the longitudinal gantry 21 to move longitudinally along the front-back direction, and the transverse telescopic tool holder 22 to move laterally along the left-right direction and to rise and fall along the up-down direction.

[0023] The placement mechanism 1 is symmetrically equipped with a screwing mechanism 3 at both the front and rear ends for rotating and fixing the heat insulation oil casing, such as... Figure 3 As shown, it includes: A horizontally positioned base 30 is provided, on which a stroke cylinder 31 and a support frame 36 are fixedly mounted. Two sets of stroke cylinders 31 are arranged side by side in the front-to-back direction and are configured as stroke hydraulic cylinders. Synchronization valves are connected to the front and rear sets of stroke cylinders 31. The synchronization valves are electrically connected to the main control device. A rotating roller 32 is fixedly installed at the stroke end of the rear stroke cylinder 31. A driver 33 is coaxially installed on the rotating roller 32. The driver 33 is electrically connected to the main control device. A lifting frame 34 is fixedly installed at the stroke end of the front stroke cylinder 31. An upper pressure roller 35 is installed at the upper end of the inner frame of the lifting frame 34. The support frame 36 is configured in a "V" shape and passes through the lifting frame 34. A lower support roller 37 is rotatably installed on the upper part of the support frame 36. The lower support roller 37 is located directly below the upper pressure roller 35.

[0024] like Figure 1 As shown, the screwing mechanism 3 has multiple temporary rails 4 arranged side by side in the front-to-back direction on the side away from the placement mechanism 1. The temporary rails 4 extend in the left-to-right direction to place the heat insulation oil sleeve after the grooving process is completed.

[0025] like Figure 1 As shown, guide rollers 5 are arranged side by side at the end of the temporary track 4 in the front-to-back direction.

[0026] The guide roller 5 is provided with an outer lining mechanism 6 along its extension line in the front-to-back direction for heat-lining anti-corrosion material onto the heat-insulating oil casing, such as... Figure 4 As shown, it includes: The longitudinal drive roller 61 used to drive the movement of the heat insulation oil casing, such as Figure 4 As shown, two sets of longitudinal drive rollers 61 are provided, respectively located on both sides of the extrusion mechanism 62 and the cooling mechanism 63, and are composed of drive rollers and drive components. The drive rollers are deflected in the horizontal direction to drive the heat insulation oil jacket to rotate and translate in the front-to-back direction; the drive components are electrically connected to the main control device.

[0027] An extrusion mechanism 62 for supplying, melting, lining, and shaping the outer lining material, such as... Figure 5As shown, the extrusion mechanism 62 is disposed between two sets of longitudinal drive rollers 61, and includes: an inlet 621, a feeding port 622, a melting tank 623, a forming tube assembly 624, a shaping tube assembly 625, and an outlet 626, which are coaxially connected in sequence. The inlet 621 is used to introduce the heat insulation oil jacket, the feeding port 622 is used to replenish the outer lining material particles, the melting tank 623 is used to extrude the molten outer lining material, the forming tube assembly 624 is used to shape the outer circle of the outer lining material, the shaping tube assembly 625 is used to cool and shape the surface of the outer lining material, and the outlet 626 is used to lead out the heat insulation oil jacket. The feeding component, temperature measuring component, heating component, and extrusion drive component in the extrusion mechanism 62 are all electrically connected to the main control device.

[0028] Cooling mechanism 63 that uses an outer lining for cooling, such as Figure 6 , Figure 7 As shown, the cooling mechanism 63 is located at the outlet end of the extrusion mechanism 62 and includes: a water storage tank 630 located below the shaping tube assembly 625; the water storage tank 630 is connected to a water supply pipeline and a drainage pipeline; a circulating water pump 631 is installed inside the water storage tank 630; the circulating water pump 631 is electrically connected to a main control device; a main drainage pipe 632 is connected to the outlet end of the circulating water pump 631; a main pipe support 633 is provided at the lower end of the main drainage pipe 632; and the main pipe support 633 is fixedly connected to the water storage tank 630. A main drain pipe 632 is connected to a branch drain pipe 634, and multiple branch drain pipes 634 are arranged in parallel. A spray head 635 is connected to the end of the branch drain pipe 634. A "Π"-shaped mounting bracket 636 is fixedly installed on the upper side wall of the water storage tank 630. The spray head 635 is fixedly installed on the mounting bracket 636. An outer protective box 637 is provided on the mounting bracket 636 to prevent water sprayed from the spray head 635 from splashing out. A downward-opening through groove is provided on the side wall of the outer protective box 637 for passing through a heat insulation oil sleeve.

[0029] In addition, a central control device is electrically connected to the grooving mechanism 2, the spin-fixing mechanism 3, the guide roller 5, and the outer lining mechanism 6.

[0030] When the heat insulation oil casing is being lined, if Figure 8 As shown, the extrusion mechanism 62 causes the extruded material to penetrate deep into the wedge groove on the outer wall of the heat insulation oil casing, thereby improving the strength of the outer lining.

[0031] After the outer lining process and cooling of the heat-insulating oil casing are completed, a heating and inward flanging process is required on the end face of the outer lining tube that protrudes from the heat-insulating oil casing. Figure 9 As shown, this forms a structure in which the outer liner is completely wrapped around the heat-insulating oil jacket.

[0032] In summary, the above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the invention. Based on the above description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of the present invention is not limited to the contents of the specification; all equivalent variations and modifications of the shape, structure, features, and spirit described within the scope of the claims should be included within the scope of the claims.

Claims

1. A production system for high-chromium super corrosion-resistant and heat-insulating oil casing for marine oil and gas development, characterized in that: include: A horizontally arranged placement mechanism (1) is used to place multiple heat-insulating oil sleeves side by side; The placement mechanism (1) is provided with a grooving mechanism (2) that moves along the front-back direction to groove the outer tube arm of the heat insulation oil casing. The placement mechanism (1) is symmetrically equipped with a screwing mechanism (3) at both the front and rear ends for rotating and fixing the heat insulation oil casing; The screwing mechanism (3) is provided with a temporary track (4) on the side away from the placement mechanism (1) for placing the heat insulation oil sleeve after the grooving process is completed. The temporary track (4) is provided with guide rollers (5) arranged side by side at its ends. The guide roller (5) is provided with an outer lining mechanism (6) along its extension line in the front-back direction for heat-lining anti-corrosion material on the heat insulation oil casing. In addition, a central control device is electrically connected to the grooving mechanism (2), the spun-fixing mechanism (3), the guide roller (5), and the outer lining mechanism (6).

2. The high-chromium super anti-corrosion and heat-insulating oil casing production system for offshore oil and gas development according to claim 1, characterized in that: The placement mechanism (1) includes: A horizontally arranged main warehouse (10) is provided with a slide rail assembly (11). The slide rail assembly (11) includes at least two slide rails arranged on the left and right sides of the main warehouse (10). A placement slot (12) is provided in the middle of the main warehouse (10) along the front-back direction. Multiple sets of placement slots (12) are arranged along the left-right direction.

3. The high-chromium super anti-corrosion and heat-insulating oil casing production system for marine oil and gas development according to claim 2, characterized in that: The grooving mechanism (2) includes: A longitudinal gantry (21) is slidably mounted on a slide rail assembly (11). A transverse telescopic tool holder (22) is movably mounted on the longitudinal gantry (21). Multiple parallel planing tools are fixedly mounted on the transverse telescopic tool holder (22) along the front-back direction. A control mechanism (23) is provided at one end of the longitudinal gantry (21). The control mechanism (23) is electrically connected to the main control device for controlling: The longitudinal gantry (21) moves longitudinally along the front-back direction; The horizontal telescopic tool holder (22) moves laterally in the left and right direction and rises and falls in the up and down direction.

4. The high-chromium super anti-corrosion and heat-insulating oil casing production system for marine oil and gas development according to claim 1, characterized in that: The screwing mechanism (3) includes: A horizontally arranged base (30) is provided with a stroke cylinder (31) and a support frame (36) fixedly mounted on the base (30). Two sets of stroke cylinders (31) are arranged side by side in the front-rear direction and are electrically connected to the main control device. A rotating roller (32) is fixedly mounted on the stroke end of the rear stroke cylinder (31). A driver (33) is coaxially mounted on the rotating roller (32) and is electrically connected to the main control device. A lifting frame (34) is fixedly mounted on the stroke end of the front stroke cylinder (31). An upper pressure roller (35) is mounted on the upper end of the inner frame of the lifting frame (34). The support frame (36) is set in a "V" shape and passes through the lifting frame (34). A lower support roller (37) is rotatably mounted on the upper part of the support frame (36) and is located directly below the upper pressure roller (35).

5. A production system for high-chromium super anti-corrosion and heat-insulating oil casing for marine oil and gas development according to claim 4, characterized in that: The stroke cylinder (31) is configured as a stroke hydraulic cylinder, and a synchronization valve is connected to the front and rear sets of stroke cylinders (31). The synchronization valve is electrically connected to the main control device.

6. The production system for high-chromium super anti-corrosion and heat-insulating oil casing for marine oil and gas development according to claim 1, characterized in that: The temporary track (4) extends in the left and right direction and has multiple tracks arranged in parallel in the front and back.

7. A production system for high-chromium super anti-corrosion and heat-insulating oil casing for offshore oil and gas development according to claim 1, characterized in that: The outer liner mechanism (6) includes: Longitudinal drive roller (61) used to drive the movement of the heat insulation oil casing. An extrusion mechanism (62) for supplying, melting, lining, and shaping the outer lining material. Cooling mechanism (63) that uses an outer lining for cooling.

8. A production system for high-chromium super corrosion-resistant and heat-insulating oil casing for offshore oil and gas development according to claim 7, characterized in that: Two sets of longitudinal drive rollers (61) are provided, respectively located on both sides of the extrusion mechanism (62) and the cooling mechanism (63), and are composed of drive rollers and drive components: The drive roller is deflected in the horizontal direction to drive the heat insulation oil jacket to rotate and translate in the front-to-back direction; The drive component is electrically connected to the central control device.

9. A production system for high-chromium super corrosion-resistant and heat-insulating oil casing for marine oil and gas development according to claim 8, characterized in that: The extrusion mechanism (62) is disposed between two sets of longitudinal drive rollers (61), and includes: The inlet (621), injection port (622), melting tank (623), forming tube assembly (624), shaping tube assembly (625), and outlet (626) are sequentially and coaxially connected. The inlet (621) is used to introduce the heat insulation oil jacket, the injection port (622) is used to replenish the outer lining material particles, the melting tank (623) is used to extrude the molten outer lining material, the forming tube assembly (624) is used to shape the outer circle of the outer lining material, the shaping tube assembly (625) is used to cool and shape the surface of the outer lining material, and the outlet (626) is used to lead out the heat insulation oil jacket. The feeding component, temperature measuring component, heating component, and extrusion drive component in the extrusion mechanism (62) are all electrically connected to the main control device.

10. A production system for high-chromium super corrosion-resistant and heat-insulating oil casing for offshore oil and gas development according to claim 9, characterized in that: The cooling mechanism (63) is located at the outlet end of the extrusion mechanism (62) and includes: A water storage tank (630) is located below the fixed pipe assembly (625). The water storage tank (630) is connected to the water supply pipeline and the drainage pipeline. A circulating water pump (631) is installed inside the water storage tank (630). The circulating water pump (631) is electrically connected to the main control device. A main drainage pipe (632) is connected to the outlet end of the circulating water pump (631). A main pipe support (633) is installed at the lower end of the main drainage pipe (632). The main pipe support (633) is fixedly connected to the water storage tank (630). A main drainage pipe (632) is connected to the upper part of the main drainage pipe (632). There are multiple drainage branch pipes (634) arranged in parallel. The end of the drainage branch pipe (634) is connected to a spray head (635). A "Π" shaped mounting bracket (636) is fixedly installed on the upper side wall of the water storage tank (630). The spray head (635) is fixedly installed on the mounting bracket (636). The mounting bracket (636) is covered with an outer protective box (637) to prevent water sprayed from the spray head (635) from splashing out. The side wall of the outer protective box (637) is provided with a downward-opening through groove for passing through a heat insulation oil sleeve.

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