A main pump dynamic pressure shaft seal throttle pipe calibration device

Abstract

The utility model provides a kind of main pump dynamic pressure shaft seal throttling pipe calibration device, including left first cover, right second cover, throttling pipe seat, cavity, first cover, cavity, throttling pipe seat, second cover are connected to become an entirety;Throttling pipe seat and cavity between being equipped with first closed cavity, second closed cavity, third closed cavity;Second closed cavity is equipped with the first throttling pipe assembly and second throttling pipe assembly needing series calibration in;First throttling pipe assembly and second throttling pipe assembly are fixed on throttling pipe seat and mutually independent;Cavity is equipped with connecting pipe A, connecting pipe B, connecting pipe C;Connecting pipe A, connecting pipe B, connecting pipe C are connected to pressure source or pressure gauge outside.Through the utility model, the main pump three-stage sealing cavity can be simulated, and the pressure distribution of the main pump three-stage sealing cavity is carried out, and the expected partial pressure effect is achieved.

Description

Technical Field

[0001] This utility model relates to the field of dynamic pressure shaft seal of nuclear power plant main pump, specifically to the calibration of a throttling pipe for dynamic pressure shaft seal of nuclear main pump. 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 a nuclear power plant's main pump typically consists of three stages of seals, each bearing a certain pressure differential. By progressively reducing the pressure at each stage, all three stages of seals can withstand the full pressure. A throttling tube ensures that the three stages of seals bear the corresponding pressure differential as designed. To achieve the required pressure drop and flow rate range, the throttling tube needs to be calibrated using a specialized device. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to design a special device to calibrate the throttling tube so that it reaches the required pressure drop and flow range.

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

[0006] A main pump dynamic pressure shaft seal throttle tube calibration device includes a first cover plate 1 on the left, a second cover plate 13 on the right, a throttle tube seat 5 between the first cover plate 1 and the second cover plate 13, and a cavity 3 above the throttle tube seat 5. The first cover plate 1, the cavity 3, the throttle tube seat 5, and the second cover plate 13 are connected as a whole. A first sealed cavity 31, a second sealed cavity 32, and a third sealed cavity 33 are provided between the throttle tube seat 5 and the cavity 3.

[0007] The second sealed cavity 32 is provided with a first throttling tube assembly 6 and a second throttling tube assembly 9 that need to be calibrated in series; the first throttling tube assembly 6 and the second throttling tube assembly 9 are fixed on the throttling tube seat 5 and are independent of each other.

[0008] The cavity 3 is equipped with connectors A14, B15, and C16;

[0009] One end of the connector A14 is connected to the outside of the cavity, and the other end is connected to the first sealed cavity 31.

[0010] One end of the connector B15 is connected to the outside of the cavity, and the other end is connected to the second sealed cavity 32.

[0011] One end of the connector C16 is connected to the outside of the cavity, and the other end is connected to the second sealed cavity 33.

[0012] Connect pipes A14, B15, and C16 to external pressure sources or pressure gauges.

[0013] As a preferred embodiment, an O-ring is provided between the cavity 3 and the first sealed cavity 31, the second sealed cavity 32, and the third sealed cavity 33; an O-ring is provided between the throttling tube seat 5 and the first cover plate 1 and the second cover plate 13; and an O-ring is provided between the throttling tube seat 5 and the cavity 3.

[0014] As a preferred embodiment, the first throttling tube assembly 6 and the second throttling tube assembly 9 include a throttling tube and connectors at both ends of the throttling tube. The length of the throttling tube is the object to be calibrated. The calibration process is as follows: test the pressure drop value at both ends of the throttling tube, adjust the length of the shunt tube according to the test value, and select the corresponding shunt tube length when the pressure drop test value reaches the target value, thus the calibration is successful.

[0015] As a preferred embodiment, the pressure block 8 fixes the first throttling tube assembly 6 and the second throttling tube assembly 9 to the throttling tube seat 5 by means of screws 8.

[0016] As a preferred embodiment, a first O-ring 2 is provided between the throttling tube seat 5 and the cavity 3, and the first O-ring 2 is located in the groove of the throttling tube seat 5;

[0017] And / or a second O-ring 4 and a third O-ring 10 are provided between the second sealed cavity 32 and the cavity 3;

[0018] And / or a fourth O-ring 11 is provided between the throttle tube seat 5 and the second cover plate 13;

[0019] And / or a fifth O-ring 12 is provided between the cavity 3 and the second cover plate 13.

[0020] As a preferred embodiment, the first cover plate 1, cavity 3, throttling tube seat 5, and second cover plate 13 are connected together as a single integral component by threaded connection.

[0021] As a preferred embodiment, the first throttling tube assembly 6 and the second throttling tube assembly 9 are 304 stainless steel throttling tube assemblies.

[0022] The working principle of this utility model is as follows:

[0023] Connector A14 is connected to a pressure source, causing the pressure in the first sealed chamber 31 to reach the initial pressure. The pressure in the second sealed chamber 32 is reduced by the first throttling tube assembly 6, and the pressure is read by the pressure gauge connected to connector B15, calibrating the pressure reduction effect of the first throttling tube assembly 6. The pressure in the second sealed chamber 32 is reduced by the second throttling tube assembly 9, and the pressure entering the third sealed chamber 33 is the pressure after the pressure reduction by the second throttling tube assembly 9, which is read by the pressure gauge connected to connector C16, calibrating the pressure reduction effect of the second throttling tube assembly 9.

[0024] The beneficial effects of this utility model are as follows:

[0025] This invention can simulate the three-stage sealing chamber of the main pump and distribute the pressure within the three-stage sealing chamber to achieve the desired pressure distribution effect. Attached Figure Description

[0026] Figure 1 This is the front view of this utility model.

[0027] Explanation of serial number

[0028] 1-First cover plate, 2-First O-ring, 3-Cavity, 4-Second O-ring, 5-Throttle tube seat, 6-First throttle tube assembly, 7-Pressure block, 8-Screw, 9-Second throttle tube assembly, 10-Third O-ring, 11-Fourth O-ring, 12-Fifth O-ring, 13-Second cover plate, 31-First sealed cavity, 32-Second sealed cavity, 33-Third sealed cavity, 14-Connector A, 15-Connector B, 16-Connector C. Detailed Implementation

[0029] 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.

[0030] like Figure 1 As shown, this embodiment provides a main pump dynamic pressure shaft seal throttle tube calibration device, including a first cover plate 1 on the left, a second cover plate 13 on the right, a throttle tube seat 5 between the first cover plate 1 and the second cover plate 13, and a cavity 3 above the throttle tube seat 5. The first cover plate 1, the cavity 3, the throttle tube seat 5, and the second cover plate 13 are connected as a whole. A first sealed cavity 31, a second sealed cavity 32, and a third sealed cavity 33 are provided between the throttle tube seat 5 and the cavity 3.

[0031] The second sealed cavity 32 is provided with a first throttling tube assembly 6 and a second throttling tube assembly 9 that need to be calibrated in series; the first throttling tube assembly 6 and the second throttling tube assembly 9 are fixed on the throttling tube seat 5 and are independent of each other.

[0032] The cavity 3 is equipped with connectors A14, B15, and C16;

[0033] One end of the connector A14 is connected to the outside of the cavity, and the other end is connected to the first sealed cavity 31.

[0034] One end of the connector B15 is connected to the outside of the cavity, and the other end is connected to the second sealed cavity 32.

[0035] One end of the connector C16 is connected to the outside of the cavity, and the other end is connected to the second sealed cavity 33.

[0036] Connect pipes A14, B15, and C16 to external pressure sources or pressure gauges.

[0037] As a preferred embodiment, an O-ring is provided between the cavity 3 and the first sealed cavity 31, the second sealed cavity 32, and the third sealed cavity 33; an O-ring is provided between the throttling tube seat 5 and the first cover plate 1 and the second cover plate 13; and an O-ring is provided between the throttling tube seat 5 and the cavity 3.

[0038] As a preferred embodiment, the first throttling tube assembly 6 and the second throttling tube assembly 9 include a throttling tube and connectors at both ends of the throttling tube. The length of the throttling tube is the object to be calibrated. The calibration process is as follows: test the pressure drop value at both ends of the throttling tube, adjust the length of the shunt tube according to the test value, and select the corresponding shunt tube length when the pressure drop test value reaches the target value, thus the calibration is successful.

[0039] As a preferred embodiment, the pressure block 8 fixes the first throttling tube assembly 6 and the second throttling tube assembly 9 to the throttling tube seat 5 by means of screws 8.

[0040] As a preferred embodiment, a first O-ring 2 is provided between the throttling tube seat 5 and the cavity 3, and the first O-ring 2 is located in the groove of the throttling tube seat 5;

[0041] And / or a second O-ring 4 and a third O-ring 10 are provided between the second sealed cavity 32 and the cavity 3;

[0042] And / or a fourth O-ring 11 is provided between the throttle tube seat 5 and the second cover plate 13;

[0043] And / or a fifth O-ring 12 is provided between the cavity 3 and the second cover plate 13.

[0044] As a preferred embodiment, the first cover plate 1, cavity 3, throttling tube seat 5, and second cover plate 13 are connected together as a single integral component by threaded connection.

[0045] As a preferred embodiment, the first throttling tube assembly 6 and the second throttling tube assembly 9 are 304 stainless steel throttling tube assemblies.

[0046] The working principle of this utility model is as follows:

[0047] Connector A14 is connected to a pressure source, causing the pressure in the first sealed chamber 31 to reach the initial pressure. The pressure in the second sealed chamber 32 is reduced by the first throttling tube assembly 6, and the pressure is read by the pressure gauge connected to connector B15, calibrating the pressure reduction effect of the first throttling tube assembly 6. The pressure in the second sealed chamber 32 is reduced by the second throttling tube assembly 9, and the pressure entering the third sealed chamber 33 is the pressure after the pressure reduction by the second throttling tube assembly 9, which is read by the pressure gauge connected to connector C16, calibrating the pressure reduction effect of the second throttling tube assembly 9.

[0048] 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 calibration device for the throttling pipe of a main pump dynamic pressure shaft seal, characterized in that: Includes a first cover plate (1) on the left, a second cover plate (13) on the right, a throttling tube seat (5) between the first cover plate (1) and the second cover plate (13), and a cavity (3) above the throttling tube seat (5). The first cover plate (1), the cavity (3), the throttling tube seat (5), and the second cover plate (13) are connected as one unit. A first sealed cavity (31), a second sealed cavity (32), and a third sealed cavity (33) are provided between the throttling tube seat (5) and the cavity (3). The second sealed cavity (32) is provided with a first throttling tube assembly (6) and a second throttling tube assembly (9) that need to be calibrated in series; the first throttling tube assembly (6) and the second throttling tube assembly (9) are fixed on the throttling tube seat (5) and are independent of each other; The cavity (3) is provided with connector A (14), connector B (15), and connector C (16); One end of the connector A (14) is connected to the outside of the cavity, and the other end is connected to the inside of the first sealed cavity (31). One end of the connector B (15) is connected to the outside of the cavity, and the other end is connected to the inside of the second sealed cavity (32). One end of the connector C (16) is connected to the outside of the cavity, and the other end is connected to the inside of the third sealed cavity (33). Connector A (14), connector B (15), connector C (16) to an external pressure source or pressure gauge.

2. The main pump dynamic pressure shaft seal throttling pipe calibration device according to claim 1, characterized in that: O-rings are provided between the cavity (3) and the first sealed cavity (31), the second sealed cavity (32), and the third sealed cavity (33), and O-rings are provided between the throttling tube seat (5) and the first cover plate (1) and the second cover plate (13); O-rings are provided between the throttling tube seat (5) and the cavity (3).

3. The main pump dynamic pressure shaft seal throttling pipe calibration device according to claim 1, characterized in that: The first throttling tube assembly (6) and the second throttling tube assembly (9) include a throttling tube and connectors at both ends of the throttling tube. The length of the throttling tube is the specified object.

4. The main pump dynamic pressure shaft seal throttling pipe calibration device according to claim 1, characterized in that: The pressure block (7) secures the first throttle tube assembly (6) and the second throttle tube assembly (9) to the throttle tube seat (5) by screws (8).

5. The main pump dynamic pressure shaft seal throttling pipe calibration device according to claim 1, characterized in that: A first O-ring (2) is provided between the throttling tube seat (5) and the cavity (3), and the first O-ring (2) is located in the groove of the throttling tube seat (5); And / or a second O-ring (4) and a third O-ring (10) are provided between the second sealed cavity (32) and the cavity (3); And / or a fourth O-ring (11) is provided between the throttle seat (5) and the second cover plate (13); And / or a fifth O-ring (12) is provided between the cavity (3) and the second cover plate (13).

6. The main pump dynamic pressure shaft seal throttling pipe calibration device according to claim 1, characterized in that: The first cover plate (1), cavity (3), throttle seat (5), and second cover plate (13) are connected by threads to form an integral component.

7. The main pump dynamic pressure shaft seal throttling pipe calibration device according to claim 1, characterized in that: The first throttling tube assembly (6) and the second throttling tube assembly (9) are 304 stainless steel throttling tube assemblies.

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