CN111946917A - A smooth nozzle fastening connection device - Google Patents

Abstract

The invention discloses a smooth pipe orifice fastening and connecting device, which comprises a split-type positioning thread assembly, a transitional connection wedge-shaped assembly (M) and an integrated compression thread assembly (C) in sequence from the inside to the outside; The transitional connection wedge-shaped assembly (M) and the split-type positioning thread assembly are fastened and locked by the hook-shaped wrench slot (G) on the integral compression thread assembly (C); the integral compression thread The assembly limit ring locking bolt (H) restricts the axial displacement of the integrated compression screw assembly (C) by fixing the integrated compression screw assembly limit ring (D). The structure of the smooth nozzle fastening connection device is relatively simple, the assembly and disassembly process is easy to operate, and there is no need to use lubricating reagents, which reduces the items introduced into the IRWST water tank and reduces the risk of foreign matter; the assembly disassembly process does not require the use of hydraulic tools for rigid assembly and disassembly. Compared with the existing scheme, the installation period of the temporary equipment for the test can be well reduced.

Description

A smooth nozzle fastening connection device

technical field

The invention belongs to the field of commissioning of core cooling systems of passive nuclear power plant units, in particular to a special underwater pneumatic isolation device for the flow resistance test (nuclear safety related) of the direct injection pipeline of the containment pit and the recirculation pipeline of the containment pit during the commissioning stage of the unit Install.

Background technique

Passive core cooling system (hereinafter referred to as PXS) is a unique safety system of AP/CAP series nuclear power plants. Most of the system flow channel tests are to verify the special safety functions of the power plant. The critical path is the focus and key point of nuclear island debugging. According to the requirements of the relevant documents of the PXS system test design of the CAP series nuclear power plant, during the commissioning stage of the unit, it is necessary to pipe the replacement material water tank (hereinafter referred to as IRWST) in the containment of the PXS system to the direct injection of the containment pit and the recirculation pipeline of the containment pit The flow resistance measurement test is used to equivalently verify that the direct injection of the containment and the recirculation of the containment pit under severe accident conditions meet the safety analysis and design requirements of the nuclear power plant.

Based on the pipeline design structure of PXS system of CAP series nuclear power plant, the inlet of the safety injection pipeline of the replacement material water tank in the containment is a smooth nozzle, and the nozzle does not have any structural components that can be installed with a pneumatic isolation device. In order to properly measure parameters such as the test flow of the containment pit direct injection pipeline and the containment pit recirculation pipeline, and prevent the related constraints between different test pipelines, a temporary pneumatic isolation device must be installed and used during the test to conduct the test medium. Control, effective and reliable isolation of non-test flow channels. Based on the engineering practice of the circular nesting device and the application of the transition piece for the installation of the temporary pneumatic isolation device based on the flow channel test of the IRWST water tank inlet safety injection pipeline of the existing PXS system, according to the subsequent CAP series nuclear power plant PXS system IRWST water tank inlet pipeline to the containment According to the test requirements of the direct injection pipeline of the pit and the flow channel of the recirculation pipeline of the containment pit, we independently developed and designed the smooth pipe orifice fastening connection device required for the installation of the test pneumatic isolation device.

SUMMARY OF THE INVENTION

In order to meet the goal of reliable installation of engineering test equipment, the invention is guided by ensuring the safe operation of the equipment, and combined with the actual needs of the test, the invention independently develops and designs to meet the follow-up CAP series nuclear power plant PXS system safety IRWST water tank inlet safety injection pipeline related flow channel test used in pneumatic isolation The unit is mounted with a smooth orifice to fasten the connection unit. The following technical scheme is adopted: the device sequentially includes a split-type positioning thread assembly, a transitional connection wedge-shaped assembly (M) and an integral compression thread assembly (C) from the inside out;

The split-type positioning thread assembly is that the split-type positioning thread assembly positioning block (B) is positioned on the outer wall of the pipeline through the radial split-type positioning screw assembly positioning block fastening bolts (F);

The wedge surface between the transition connection wedge-shaped component (M) and the split-type positioning thread component is matched with the wedge surface, and is fastened by the hook-type wrench groove (G) on the integral compression thread component (C). locking; the transition connection wedge assembly (M) and the integral compression thread assembly (C) have a certain distance of sliding clearance;

The outer side of the integral compression thread assembly (C) is slidably nested with the integral compression thread assembly limit ring (D), and an integral compression thread assembly limit ring (D) is provided on the circumference of the integral compression thread assembly. Compression thread assembly limit ring locking bolts (H), the one-piece compression thread assembly limit ring locking bolts (H) restrict all The one-piece compression thread assembly (C) is axially displaced.

Preferably, the limit ring locking bolt (H) of the integral compression thread assembly is a hexagon socket type.

Preferably, the inner surface of the positioning block (B) of the split positioning screw assembly is processed by diamond knurling.

Preferably, the outer side of the overlapping mating section of the split-lobe positioning thread assembly and the transition connection wedge assembly (M) is provided with a locking thread, and the locking thread is threadedly engaged with the integral compression thread assembly (C).

Preferably, the one-piece compression thread assembly (C) is in the shape of a circular cylinder with a built-in locking thread.

Preferably, the interface flange (E) of the pneumatic isolation device is welded after the assembly of the integral compression screw assembly (C) is completed.

Preferably, the interface flange (E) of the pneumatic isolation device is provided with a sealing positioning groove, and the interface flange (E) of the pneumatic isolation device and the split-type positioning thread assembly cooperate to squeeze the seal to realize the sealing of the outer wall of the pipeline. Reliable sealing.

The structure of the smooth nozzle fastening connection device is relatively simple, the assembly disassembly process is easy to operate, and there is no need to use lubricating reagents, which reduces the items introduced into the IRWST water tank and reduces the risk of foreign matter; the assembly disassembly process does not require the use of hydraulic tools for rigid assembly and disassembly. Compared with the existing scheme, the installation period of the temporary equipment for the test can be well reduced. The inner wall of the split-type positioning threaded assembly is processed by prismatic knurling. After applying sufficient torque to the reinforcement bolts, a sufficient friction force between the assembly and the pipeline is ensured to prevent axial sliding during the tightening process of the integrated compression threaded assembly. Prevent the equipment from falling off due to axial sliding during the operation of the pneumatic isolator. Tightening through the integral compression thread assembly enables the split positioning thread assembly and the transition connection wedge assembly to have a close enough fit, ensuring reliable and leak-free sealing between each assembly and the pipeline, with high reliability.

Description of drawings

Figure 1 is a schematic diagram of a smooth nozzle fastening connection device;

Fig. 2 is a kind of assembly drawing and sectional view of a smooth nozzle fastening connection device;

Fig. 3 is the physical structure diagram of the positioning block of the split-type positioning screw assembly;

Among them: A—pipeline; B—split type positioning thread assembly positioning block; C—integrated compression thread assembly; D—integrated compression thread assembly limit ring; E—pneumatic isolation device interface flange; F—point Flap-type positioning thread assembly positioning block fastening bolt; G—integrated compression thread assembly hook wrench slot; H—integrated compression thread assembly limit ring locking bolt; I—seal; J—built-in locking Thread; K—One-piece compression thread assembly limit ring sliding clearance; L—Pneumatic isolation device interface flange bolt hole; M—Transition connection wedge assembly; N—Split type positioning thread assembly positioning block interface straight flange; O —Knurled surface; P—sealing installation groove; Q—split type positioning thread component positioning block bolt hole.

Detailed ways

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

The present invention will be further described below with reference to Figs.

The first part is the split-type positioning thread assembly, which consists of two split-type positioning screw assembly positioning blocks B with the same structure, which are connected by the paired pneumatic isolation device interface flange E, and the design between the pneumatic isolation device interface flanges E There is a certain stretching allowance. During installation, the bolts F are tightened and stretched by the positioning block of the split positioning threaded assembly, and the inner wall is knurled to form a knurled surface O, which increases the friction with the outer wall of the pipeline. The coefficient is based on the locking torque of the positioning block fastening bolt F of the split-type positioning threaded assembly to strengthen the degree of cooperation between the inner wall of the assembly and the outer wall of the pipe, to prevent the axial sliding of the assembly during the locking process of the integrated compression threaded assembly C, and to prevent During the operation of the pneumatic isolation device, the axial displacement of the pipeline occurs to ensure the reliable positioning of the entire device.

The second part is the transition connection wedge assembly M: this assembly forms an assembly with the integral compression thread assembly C, the integral compression thread assembly limit ring D, the installation interface flange E of the pneumatic isolation device, and the transition connection wedge assembly M , the component is made by forging. The first is to nest and assemble the one-piece compression thread assembly C, then assemble the one-piece compression thread assembly limit ring D, and finally weld the installation interface flange E of the pneumatic isolation device. The one-piece compression thread assembly limit ring D is distributed on a 360° circumference with 6 inner hexagon sockets. Afterwards, fix the limit ring D of the integral compression thread assembly through 6 hexagonal socket head integral compression thread assembly limit ring locking bolts H to limit the axial displacement of the integral compression thread assembly C. The transition connection wedge-shaped component M has its own sealing and positioning groove, and after installation, it cooperates with the split-type positioning thread component to squeeze the sealing member I to realize reliable sealing of the outer wall of the pipeline.

The third part is the one-piece compression thread assembly C: the overall structure of this assembly is a circular column with a built-in locking thread J. When the split positioning thread assembly is matched with the transition connection wedge assembly M, use a special hook wrench to pass the clamp The groove G fixes the applied torque, and rotates the integral compression thread component C to fasten the split-type positioning thread component positioning block B to provide axial tension, and increase the cooperation between the split-type positioning thread component positioning block B and the transition connection wedge-shaped component M To ensure the reliable sealing of the outer wall of the pipeline. Reliable positioning of the transition connection wedge assembly M facilitates the installation and cooperation of the interface flange E of the pneumatic isolation device.

The above process is equipped with split-type positioning thread components, transitional connection wedge-shaped components, integrated compression thread components, i.e., integrated compression thread component limit rings, etc. The above components are assembled before the installation of the special pneumatic isolation device for the test, and then the The assembly of the special pneumatic isolation device for the test can be completed by disassembling the pneumatic isolation device and assembling the interface flange of the transitional connection wedge-shaped assembly.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Thus, provided that these modifications and variations of the present invention fall within the scope of the claims of the present invention and their technical equivalents, the present invention is also intended to include such modifications and variations. The above-mentioned embodiments or implementations are merely illustrative of the present invention, and the present invention may also be implemented in other specific forms or other specific forms without departing from the gist or essential characteristics of the present invention. Accordingly, the described embodiments are to be regarded in all respects as illustrative and not restrictive. The scope of the present invention should be indicated by the appended claims, and any changes equivalent to the intent and scope of the claims should also be included within the scope of the present invention.

Claims (7)

1. A smooth pipe orifice fastening and connecting device is characterized by comprising a split type positioning threaded component, a transitional connection wedge-shaped component (M) and an integrated pressing threaded component (C) from inside to outside in sequence;

the split positioning threaded component is a split positioning threaded component positioning block (B) which is positioned on the outer wall of the pipeline through a radial split positioning threaded component positioning block fastening bolt (F);

the transition connection wedge-shaped component (M) is matched with a wedge surface between the split type positioning thread components and is fastened and locked through a hook type spanner clamping groove (G) on the integrated pressing thread component (C); the transition connection wedge assembly (M) and the integral compression thread assembly (C) have a sliding clearance at a certain distance;

the integrated type compression thread component (C) outer side and the integrated type compression thread component limiting ring (D) are nested in a sliding mode, an integrated type compression thread component limiting ring locking bolt (H) is arranged on the circumference of the integrated type compression thread component limiting ring (D), and the integrated type compression thread component limiting ring locking bolt (H) is fixed to limit the integrated type compression thread component limiting ring (D) to limit axial displacement of the integrated type compression thread component (C).

2. A smooth-mouthed fastening connection, according to claim 1, characterized in that said integrated compression-screw assembly stop-ring locking bolt (H) is of the hexagon socket type.

3. The smooth-mouthed fastening connection, as recited in claim 1, wherein said split positioning screw assembly positioning block (B) has an inner surface formed by diamond knurling.

4. A smooth-bore fastening connection as claimed in claim 1, wherein said split set screw assembly is threaded with locking threads on the outside of the overlapping mating section of said transition wedge assembly (M), said locking threads being threadedly engaged with said integral compression screw assembly (C).

5. A smooth-mouthed fastening connection, according to claim 1, characterized in that said integral compression screw assembly (C) is of cylindrical shape with internal locking screw (J).

6. The smooth-pipe-mouth fastening connection according to claim 1, wherein the integral compression screw assembly (C) is assembled and then welded with the pneumatic isolator port flange (E).

7. The smooth-pipe-mouth fastening connection device according to claim 6, wherein the pneumatic isolator interface flange (E) is provided with a seal positioning groove, and the pneumatic isolator interface flange (E) and the split positioning threaded assembly press the seal member in cooperation to realize reliable sealing of the outer wall of the pipeline.

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