Compressed air system and air pressure monitoring device of diesel generating set

Abstract

The utility model discloses a diesel generating set compressed air system and an air pressure monitoring device, the air pressure monitoring device comprises a connecting disc and a pressure gauge, the center of the connecting disc is provided with a vent hole, and a gauge rod of the pressure gauge is communicated with the vent hole. The connecting disc is provided with a plurality of mounting holes distributed around the vent hole, and the mounting holes are used for being connected with a drainage flange at the tail end of a drainage pipeline of the compressed air tank. According to the air pressure monitoring device provided by the utility model, a tester can quickly confirm the real reason of alarm, and time is saved for eliminating alarm signals.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power plants, in particular to a diesel generator set compressed air system and an air pressure monitoring device. Background Art

[0002] The emergency diesel generator of a nuclear power plant (hereinafter referred to as "diesel engine") is directly related to nuclear safety as an emergency safety power supply. Its purpose is to ensure the safe shutdown of the unit and prevent damage to key equipment when both the plant working power supply and the auxiliary power supply of the nuclear power plant fail. The diesel engine of the emergency diesel generator set does not have the ability to start by itself. To make the static diesel engine rotate, it is necessary to use external force to create the conditions for the diesel engine to obtain the first working stroke, that is, to take in air, compress, and inject fuel under the action of external force until the fuel burns and expands to do work to push the piston to rotate by itself. This process is called diesel engine starting.

[0003] The compressed air system of a diesel generator set is used to start the diesel engine and control the air control valve. It is usually equipped with two air compressors, two starting air tanks and an overspeed protection air tank. Both starting air tanks can start the diesel engine independently. When the diesel engine overspeeds and needs emergency shutdown, the compressed air in the overspeed protection air tank is used to purge the oil circuit in the diesel engine cylinder to achieve the purpose of rapid shutdown. The two air compressors provide compressed air to the two starting air tanks respectively. The overspeed protection air tank is connected to the starting air tank through a pipeline, and the starting air tank replenishes gas to the overspeed protection air tank.

[0004] The diesel engine start signal is divided into emergency start mode and regular start mode. During the emergency start process, the regular protection trip signal of the diesel engine will be shielded, and only the emergency protection trip signal will be activated. The monthly low-power test of the diesel engine is an inspection test to ensure the performance of the diesel generator set. The test adopts the emergency start mode. During the start process, only the emergency protection trip signal is activated, and the regular protection trip signal of the diesel engine is not activated. When the diesel engine is running stably, the tester presses the "diesel generator set allowed to stop" button, and then all the protections of the diesel engine will be activated. After the diesel engine is started in the above test, an alarm signal may sometimes appear, such as the "overspeed protection air tank low pressure" alarm signal. If the alarm signal has not been eliminated, the tester shall not press the "diesel generator set allowed to stop" button. However, if the conventional protection of the diesel engine is not activated for a long time, it will affect the safe and stable operation of the diesel engine. Therefore, the tester is required to confirm the true cause of the alarm as soon as possible. The current compressed air system has the following disadvantages: after the alarm signal indicating that the pressure of a compressed air tank is low appears, the tester cannot further confirm whether the air pressure threshold of the alarm has drifted or the air pressure in the compressed air tank has actually dropped, which causes the tester to spend a long time to eliminate the alarm signal. Utility Model Content

[0005] In view of this, one of the purposes of the utility model is to provide an air pressure monitoring device so that test personnel can quickly confirm the real cause of the alarm and save time for eliminating the alarm signal. Another purpose of the utility model is to provide a diesel generator set compressed air system including the above-mentioned air pressure monitoring device.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] An air pressure monitoring device, comprising:

[0008] A connecting plate, wherein a vent hole is provided at the center of the connecting plate, and the connecting plate is provided with a plurality of mounting holes distributed around the vent hole, wherein the mounting holes are used to connect to a drainage flange at the end of a drainage pipeline of a compressed air tank;

[0009] A pressure gauge, wherein a gauge rod of the pressure gauge is connected to the vent hole.

[0010] Optionally, the above-mentioned air pressure monitoring device includes a connecting head, which is provided with an axial connecting channel, and the two ends of the connecting head are respectively a first connecting part and a second connecting part, the first connecting part is provided with a first external thread connected to the vent hole, and the second connecting part is provided with a first internal thread connected to the meter stem.

[0011] Optionally, in the above-mentioned air pressure monitoring device, the first external thread is configured as a conical thread.

[0012] Optionally, in the above-mentioned air pressure monitoring device, the connecting head is configured to be in a bolt shape, the first connecting portion is located at the bolt rod of the connecting head, and the second connecting portion is located at the bolt head of the connecting head.

[0013] Optionally, in the above-mentioned air pressure monitoring device, a first annular sealing gasket is included, and the first sealing gasket is located in the threaded hole where the first internal thread is located, and the first sealing gasket is against the end of the meter rod.

[0014] Optionally, in the above-mentioned air pressure monitoring device, the material of the first sealing gasket is copper.

[0015] Optionally, in the above-mentioned air pressure monitoring device, a disc-shaped second sealing gasket is included, and the second sealing gasket is provided with a first hole corresponding to the position of the vent hole and a second hole corresponding to the position of the mounting hole.

[0016] Optionally, in the above-mentioned air pressure monitoring device, the outer edge of the second sealing gasket is provided with a protrusion for hand-holding.

[0017] A compressed air system for a diesel generator set comprises a compressed air tank and a drainage pipeline connected to the compressed air tank, and also comprises an air pressure monitoring device as disclosed in any one of the above items, wherein the air pressure monitoring device is connected to the drainage pipeline.

[0018] Optionally, in the above-mentioned diesel generator set compressed air system, the compressed air tank is an overspeed protection air tank.

[0019] The air pressure monitoring device provided by the utility model can be applied to the inspection test of the compressed air system of the diesel generator set, such as the monthly low-power test of the diesel engine. Before the test starts, the air pressure monitoring device is installed on the drainage flange at the end of the drainage pipeline of the compressed air tank, so that the pressure gauge of the air pressure monitoring device is connected to the compressed air tank through the drainage pipeline. During the test, the tester can check the real-time pressure in the compressed air tank through the pressure gauge. In this way, after the alarm signal indicating that the pressure of the compressed air tank is low occurs, the tester can further confirm through the air pressure monitoring device whether the air pressure in the compressed air tank has actually dropped, thereby saving time for quickly finding out the real reason for the alarm, so as to eliminate the alarm signal as soon as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the top view of the arrangement of the air pressure monitoring device provided by the embodiment of the utility model in the compressed air system of the diesel generator set;

[0022] Figure 2 yes Figure 1 Schematic diagram of the air pressure monitoring device in;

[0023] Figure 3 yes Figure 3 A schematic diagram of the connection disk in FIG.

[0024] Figure 4 yes Figure 3 Right view of;

[0025] Figure 5 yes Figure 3 Schematic diagram of the second sealing gasket in .

[0026] The markings in the figure are:

[0027] 1. Compressed air tank; 2. Isolation valve; 3. Drain pipe; 4. Bolts; 5. Drain flange; 6. Second sealing gasket; 61. First hole; 62. Second hole; 63. Raised part; 7. Connecting plate; 71. Vent hole; 72. Mounting hole; 8. Connecting head; 9. Pressure gauge; 91. Gauge stem. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] See also Figure 1~Figure 5 The embodiment of the utility model provides an air pressure monitoring device, including a connection plate 7 and a pressure gauge 9, wherein a vent hole 71 is provided at the center of the connection plate 7, and a gauge rod 91 of the pressure gauge 9 is connected to the vent hole 71. The connection plate 7 is provided with a plurality of mounting holes 72 distributed around the vent hole 71, and the mounting holes 72 are used to connect with the drain flange 5 at the end of the drain pipe 3 of the compressed air tank 1. The connection plate 7 is used to install the air pressure monitoring device on the drain flange 5 at the end of the drain pipe 3 of the compressed air tank 1, such as Figure 1 As shown, during installation, the isolation valve 2 on the drainage pipeline 3 is first closed, and then the end cover (not shown in the figure) originally installed on the drainage flange 5 is removed, and the connection plate 7 of the air pressure monitoring device is replaced, and finally the isolation valve 2 is reopened, so that the pressure gauge 9 is connected to the compressed air tank 1 through the drainage pipeline 3. In the subsequent test process (such as the monthly low-power test of the diesel engine), the tester can check the real-time pressure in the compressed air tank 1 through the pressure gauge 9. In this way, after the alarm signal indicating that the pressure of the compressed air tank 1 is low occurs, the tester can further confirm whether the air pressure in the compressed air tank 1 has actually dropped through the air pressure monitoring device, thereby saving time for quickly finding out the real cause of the alarm, so that the alarm signal can be eliminated as soon as possible.

[0030] like Figure 2 As shown, in some embodiments, the pressure gauge 9 of the air pressure monitoring device can be a mechanical pointer pressure gauge. Of course, the pressure gauge 9 can also be set as a digital pressure gauge. The pressure gauge 9 can be directly connected to the connecting plate 7, or can be connected through other components, such as Figure 2In the illustrated embodiment, the air pressure monitoring device includes a connector 8, which is provided with an axial connecting passage (not shown in the figure), and the two ends of the connector 8 are respectively a first connecting portion and a second connecting portion, the first connecting portion is provided with a first external thread connected to the vent hole 71 of the connecting disk 7, and the second connecting portion is provided with a first internal thread connected to the gauge rod 91 of the pressure gauge 9. In this structure, the vent hole 71 of the connecting disk 7 has an internal thread, and the gauge rod 91 of the pressure gauge 9 has an external thread, and the two ends of the connector 8 are screwed and connected to the vent hole 71 of the connecting disk 7 and the gauge rod 91 of the pressure gauge 9, respectively. In order to improve the sealing of the connection, the above-mentioned first external thread can be set as a conical thread. In this structure, the internal thread of the vent hole 71 of the connecting disk 7 is correspondingly set as a conical thread, such as Figure 3 shown.

[0031] like Figure 2 As shown, in some embodiments, the connector 8 can be set to a bolt shape, the first connection part is located at the bolt rod of the connector 8, and the second connection part is located at the bolt head of the connector 8. By setting the connector 8 to a bolt shape, the connector 8 can be easily installed using tools such as a wrench. The gauge rod 91 of the pressure gauge 9 is screwed into the bolt head of the connector 8. In order to improve the sealing of the connection between the gauge rod 91 and the connector 8, the air pressure monitoring device may include an annular first sealing gasket (not shown in the figure), the first sealing gasket is located in the threaded hole where the above-mentioned first internal thread is located, and the first sealing gasket is against the end of the gauge rod 91. The material of the first sealing gasket can be copper. The sealing copper gasket can withstand a large extrusion force, and will be slightly deformed after being compressed, filling the uneven part of the end surface of the gauge rod 91 to improve the sealing effect.

[0032] like Figure 1 , Figure 4 and Figure 5 As shown, in some embodiments, the air pressure monitoring device may include a disc-shaped second sealing gasket 6, and the second sealing gasket 6 is provided with a first hole 61 corresponding to the position of the vent hole 71 and a second hole 62 corresponding to the position of the mounting hole 72. When installing the connecting plate 7 to the connecting flange, align the second hole 62 of the second sealing gasket 6 with the mounting hole 72 of the connecting plate 7, and use the bolts 4 passing through the second hole 62 and the mounting hole 72 to fix the connecting plate 7 to the connecting flange. The mounting holes 72 of the connecting plate 7 can be set to four, or to other values ​​such as three, five, or six. In order to improve the sealing of the connection between the connecting plate 7 and the connecting flange, the mounting holes 72 can be evenly distributed around the vent hole 71. As shown Figure 5 As shown, in some embodiments, the outer edge of the second sealing gasket 6 may be provided with a protrusion 63 for holding. By holding the protrusion 63 to lift the second sealing gasket 6, the second sealing gasket 6 can be conveniently placed on the disk surface of the connecting disk 7, and pinching the protrusion 63 when installing the bolt 4 can prevent the second sealing gasket 6 from shifting.

[0033] like Figure 1 As shown, an embodiment of the utility model provides a compressed air system for a diesel generator set, comprising a compressed air tank 1 and a drainage pipeline 3 connected to the compressed air tank 1, and also comprising an air pressure monitoring device disclosed in any of the above embodiments, the air pressure monitoring device being connected to the drainage pipeline 3. In some embodiments, the compressed air tank 1 can be an overspeed protection air tank, or a starting air tank connected to an air compressor (not shown in the figure).

[0034] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0035] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An air pressure monitoring device, characterized in that: include: A connecting plate, wherein a vent hole is provided at the center of the connecting plate, and the connecting plate is provided with a plurality of mounting holes distributed around the vent hole, wherein the mounting holes are used to connect to a drainage flange at the end of a drainage pipeline of a compressed air tank; A pressure gauge, wherein a gauge rod of the pressure gauge is connected to the vent hole.

2. The air pressure monitoring device according to claim 1, characterized in that: It includes a connecting head, which is provided with an axial connecting channel. The two ends of the connecting head are respectively a first connecting part and a second connecting part. The first connecting part is provided with a first external thread connected to the vent hole, and the second connecting part is provided with a first internal thread connected to the meter stem.

3. The air pressure monitoring device according to claim 2, characterized in that: The first external thread is configured as a tapered thread.

4. The air pressure monitoring device according to claim 2, characterized in that: The connecting head is configured to be in a bolt shape, the first connecting portion is located at the bolt rod of the connecting head, and the second connecting portion is located at the bolt head of the connecting head.

5. The air pressure monitoring device according to claim 2, characterized in that: It comprises a first annular sealing gasket, wherein the first sealing gasket is located in the threaded hole where the first internal thread is located, and the first sealing gasket abuts against the end of the meter rod.

6. The air pressure monitoring device according to claim 5, characterized in that: The first sealing gasket is made of copper.

7. The air pressure monitoring device according to any one of claims 1 to 6, characterized in that: A disc-shaped second sealing gasket is included, wherein the second sealing gasket is provided with a first hole corresponding to the position of the vent hole and a second hole corresponding to the position of the mounting hole.

8. The air pressure monitoring device according to claim 7, characterized in that: The outer edge of the second sealing pad is provided with a protrusion for handholding.

9. A diesel generator set compressed air system, comprising a compressed air tank and a drainage pipeline connected to the compressed air tank, characterized in that: It also includes an air pressure monitoring device as described in any one of claims 1 to 8, and the air pressure monitoring device is connected to the drainage pipeline.

10. The diesel generator set compressed air system according to claim 9, characterized in that: The compressed air tank is an overspeed protection air tank.

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