A primary and secondary seal mounting and positioning device for a main pump

Abstract

This utility model provides a primary and secondary seal installation and positioning device for a main pump, including an upper manifold plate and a lower manifold plate. The upper manifold plate is fixedly connected to the secondary sealing cavity, and the lower manifold plate is fixedly connected to the secondary shaft sleeve. A step is provided at the connection and mating position of the upper and lower manifold plates. The upper manifold plate is fixed on the secondary sealing cavity of the secondary seal, and the lower manifold plate is fixed on the secondary shaft sleeve of the secondary seal. An L-shaped connecting ring is provided at the connection between the primary and secondary shaft sleeves. One end of the L-shaped connecting ring is inserted into the groove of the primary shaft sleeve, and the other end is connected to the secondary shaft sleeve. This utility model ensures reliable installation and positioning of the primary and secondary seals of the main pump. The step ensures a tight connection between the upper and lower manifold plates. The pin limit prevents relative rotation of the upper and lower manifold plates, and the shift fork structure ensures a reliable connection between the primary and secondary shaft sleeves and prevents them from loosening.

Description

Technical Field

[0001] This utility model relates to the field of dynamic pressure shaft seals for main pumps in nuclear power plants, and in particular to a primary and secondary seal installation and positioning device for main pumps. Background Technology

[0002] The main pump is a key piece of equipment in a nuclear power plant. The mechanical seal is one of the key components of the main pump, used to limit the leakage of reactor coolant. It is also the most easily damaged component on the main pump. Even a slight operational deviation can cause abnormal leakage, or even lead to an emergency reactor shutdown, threatening the safe operation of the power plant and causing huge economic losses.

[0003] The shaft seal of the main pump in a nuclear power plant requires extremely high reliability, ensuring a stable leakage rate and long-term reliable operation. Under normal operating conditions, the main pump shaft seal components can withstand one-third of the pressure in the primary circuit, and under special circumstances, they can withstand the full pressure of the primary circuit. During the installation of the main pump's dynamic pressure shaft seal, the primary and secondary seals are integrated into a single unit using a primary and secondary seal mounting plate, making the installation process more convenient. After the primary and secondary seals are in place, the primary and secondary mounting and positioning device is removed. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a primary and secondary seal installation and positioning device for a main pump.

[0005] To achieve the above-mentioned objectives, the technical solution of this utility model is as follows:

[0006] A primary and secondary seal installation and positioning device for a main pump includes an upper manifold 1 and a lower manifold 2. The upper manifold 1 is fixedly connected to the secondary seal cavity 11.2, and the lower manifold 2 is fixedly connected to the secondary shaft sleeve 12.2.

[0007] A step 6 is provided at the connection and mating position of the upper manifold 1 and the lower manifold 2. The upper manifold 1 is fixed on the secondary sealing cavity 11.2 of the secondary seal 9, and the lower manifold 2 is fixed on the secondary bushing 12.2 of the secondary seal 9. The manifold 1 and the lower manifold 2 integrate the rotating part of the primary seal 8 and the secondary seal 9 and the relatively stationary part fixed in the sealing cavity together.

[0008] The partial protruding structure at the rear end of the primary bushing 12.1 and the partial groove structure at the front end of the secondary bushing 12.2 fit together to form the shift fork structure 13;

[0009] An L-shaped connecting ring 5 is provided at the connection between the primary bushing 12.1 and the secondary bushing 12.2. One end of the L-shaped connecting ring 5 is inserted into the groove 14 of the primary bushing 12.1, and the other end is connected to the secondary bushing 12.2.

[0010] The end groove structure of the lower container plate 2 and the end protrusion structure of the secondary bushing 12.2 are fitted together to form the fork structure 13.

[0011] As a preferred embodiment, a pin 7 is provided at the mating connection between the upper container plate 1 and the lower container plate 2, with one end of the pin 7 extending into the upper container plate 1 and the other end extending into the lower container plate 2.

[0012] As a preferred embodiment, lifting holes 10 are provided on the back of the upper container plate 1.

[0013] As a preferred embodiment, the upper container plate 1 is connected to the secondary sealing cavity 11.2 by screw A3.

[0014] As a preferred embodiment, the lower cartridge plate 2 is connected to the secondary bushing 12.2 by screw B4.

[0015] The beneficial effects of this utility model are as follows:

[0016] This utility model ensures reliable installation and positioning of the primary and secondary seals of the main pump. The step 6 ensures a tight fit between the upper manifold 1 and the lower manifold 2. The pin 7 limits the relative rotation of the upper and lower manifolds. The shift fork structure ensures a reliable connection between the primary bushing 12.1 and the secondary bushing, preventing them from loosening. Attached Figure Description

[0017] Figure 1 This is the front view of this utility model.

[0018] 1-Upper container plate, 2-Lower container plate, 3-Screw A, 4-Screw B, 5-L-type connecting ring, 6-Step, 7-Pin, 8-Primary seal, 9-Secondary seal, 10-Lifting hole, 11.1-Primary sealing cavity, 11.2-Secondary sealing cavity, 12.1-Primary bushing, 12.2-Secondary bushing, 13-Shift fork structure, 14-Groove. Detailed Implementation

[0019] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0020] like Figure 1 As shown, a primary and secondary seal installation and positioning device for a main pump includes an upper manifold 1 and a lower manifold 2. The upper manifold 1 is fixedly connected to the secondary seal cavity 11.2, and the lower manifold 2 is fixedly connected to the secondary bushing 12.2.

[0021] A step 6 is provided at the connection and mating position of the upper manifold 1 and the lower manifold 2. The upper manifold 1 is fixed on the secondary sealing cavity 11.2 of the secondary seal 9, and the lower manifold 2 is fixed on the secondary bushing 12.2 of the secondary seal 9. The manifold 1 and the lower manifold 2 integrate the rotating part of the primary seal 8 and the secondary seal 9 and the relatively stationary part fixed in the sealing cavity together.

[0022] The partial protruding structure at the rear end of the primary bushing 12.1 and the partial groove structure at the front end of the secondary bushing 12.2 fit together to form the shift fork structure 13;

[0023] An L-shaped connecting ring 5 is provided at the connection between the primary bushing 12.1 and the secondary bushing 12.2. One end of the L-shaped connecting ring 5 is inserted into the groove 14 of the primary bushing 12.1, and the other end is connected to the secondary bushing 12.2.

[0024] The end groove structure of the lower container plate 2 and the end protrusion structure of the secondary bushing 12.2 are fitted together to form the fork structure 13.

[0025] Preferably, a pin 7 is provided at the mating connection between the upper container plate 1 and the lower container plate 2, with one end of the pin 7 extending into the upper container plate 1 and the other end extending into the lower container plate 2.

[0026] Preferably, lifting holes 10 are provided on the back of the upper container plate 1.

[0027] Preferably, the upper container plate 1 is connected to the secondary sealing cavity 11.2 by screw A3.

[0028] Preferably, the lower cartridge plate 2 is connected to the secondary bushing 12.2 by screw B4.

[0029] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A primary pump two-stage seal mounting and positioning device, characterized by: It includes an upper container plate (1) and a lower container plate (2). The upper container plate (1) is fixedly connected to the secondary sealing cavity (11.2), and the lower container plate (2) is fixedly connected to the secondary bushing (12.2). A step (6) is provided at the connection and mating position of the upper container plate (1) and the lower container plate (2). The upper container plate (1) is fixed on the secondary sealing cavity (11.2) of the secondary seal (9), and the lower container plate (2) is fixed on the secondary bushing (12.2) of the secondary seal (9). The container plate (1) and the lower container plate (2) integrate the shaft-rotating part of the primary seal (8) and the secondary seal (9) and the relatively stationary part fixed in the sealing cavity together. The partial protrusion structure at the rear end of the primary bushing (12.1) and the partial groove structure at the front end of the secondary bushing (12.2) fit together to form a fork structure (13); An L-shaped connecting ring (5) is provided at the connection between the primary bushing (12.1) and the secondary bushing (12.2). One end of the L-shaped connecting ring (5) is inserted into the groove (14) of the primary bushing (12.1), and the other end is connected to the secondary bushing (12.2). The end groove structure of the lower container plate (2) and the end protrusion structure of the secondary bushing (12.2) are fitted together to form a fork structure (13).

2. A primary pump two-stage seal mounting and positioning device as claimed in claim 1, wherein: A pin (7) is provided at the mating connection between the upper container plate (1) and the lower container plate (2), with one end of the pin (7) extending into the upper container plate (1) and the other end extending into the lower container plate (2).

3. A primary pump two-stage seal mounting and positioning device as claimed in claim 1, wherein: Lifting holes (10) are provided on the back of the upper container plate (1).

4. A primary pump two-stage seal mounting and positioning device as claimed in claim 1, wherein: The upper container plate (1) is connected to the secondary sealing cavity (11.2) by screw A (3).

5. A primary pump two-stage seal mounting and positioning device as claimed in claim 1, wherein: The lower container plate (2) is connected to the secondary bushing (12.2) by screw B (4).

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