Large vertical centrifugal pump equipment and air bag sealing and pressure maintaining system

Abstract

The utility model provides large vertical centrifugal pump equipment and an air bag sealing and pressure maintaining system, and relates to the technical field of large vertical centrifugal pumps. The air bag sealing pressure maintaining system comprises an air bag sealing assembly, a pressure gauge, an alarm and a connecting wire. The air bag sealing assembly comprises an air source, a connecting air path, a first valve and an air bag, the air source is connected with the air bag through the connecting air path, and the first valve is arranged on the connecting air path. The pressure gauge is used for detecting the pressure of the air bag, the alarm is electrically connected with the pressure gauge through the connecting wire, the positions of the air bag and the pressure gauge basically have no signals, so that pressure information detected by the pressure gauge can be output to the alarm through the connecting wire, and the alarm can be arranged on the outer side of a narrow space during installation. When the pressure of the air bag exceeds a threshold value, an alarm signal is sent out through the alarm, so that the frequency of entering and exiting a narrow space by personnel is greatly reduced, and the possibility of safety problems is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of large vertical centrifugal pumps, in particular to large vertical centrifugal pump equipment and an airbag sealing and pressure-maintaining system. Background Art

[0002] At present, the existing large vertical centrifugal pumps generally use air bags as sealing devices when they are shut down on site to prevent seawater from backflowing, thereby preventing seawater from corroding the pump cover and its internal components. The main principle is as follows: air is supplied to the air bag through an air source, and when the air bag pressure reaches the design value, the air bag is pressurized by closing the valve. At this time, the air bag is in an expanded state, which can eliminate the gap between the air bag and other components, thereby achieving the purpose of sealing.

[0003] In order to ensure that the airbag has a good sealing effect during the shutdown process, it is necessary to regularly send people to check whether the airbag pressure changes during the airbag pressure maintenance process, and keep the airbag pressure within the set range by controlling the valve. However, at present, the airbag, valve and other components are located in a small space. On the one hand, people entering and exiting the space involve climbing high and close to the edge. On the other hand, there is basically no signal in the space, and there is a certain risk for people to enter and exit. Utility Model Content

[0004] The utility model aims to provide an airbag sealing and pressure-maintaining system, which can improve the technical problems in the prior art that personnel are required to frequently perform pressure checks and have high safety risks.

[0005] The utility model also aims to provide a large vertical centrifugal pump device, which can improve the technical problems in the prior art that personnel need to frequently perform pressure checks and have high safety risks.

[0006] The embodiments of the present invention can be implemented in the following ways:

[0007] An airbag sealing and pressure-maintaining system, the airbag sealing and pressure-maintaining system comprising:

[0008] An airbag sealing assembly, the airbag sealing assembly comprising an air source, a connecting air path, a first valve and an airbag, the air source being connected to the airbag via the connecting air path, and the first valve being arranged on the connecting air path, and the on-off of the air source and the airbag can be controlled by the first valve;

[0009] a pressure gauge, the pressure gauge being used to detect the pressure of the airbag; and

[0010] An alarm and a connecting wire, wherein the alarm is electrically connected to the pressure gauge through the connecting wire, so that an alarm signal is sent out through the alarm when the pressure of the airbag exceeds a threshold value.

[0011] Optionally, the alarm device includes an alarm unit, and the alarm unit is used to emit at least one of an alarm sound signal and an alarm light signal; the alarm signal includes the alarm sound signal and / or the alarm light signal.

[0012] Optionally, the alarm further has a signal transmitter, and the signal transmitter is used to transmit a wireless signal containing alarm information to a cloud network.

[0013] Optionally, the pressure gauge is connected to the connecting gas path, and the pressure gauge is located on a side of the first valve close to the airbag.

[0014] Optionally, the air source includes a formal air source and a temporary air source, the connecting air path includes a first branch connected to the formal air source and a second branch connected to the temporary air source, and the airbag sealing assembly also includes a second valve and a third valve; the second valve is arranged on the first branch to control the opening and closing of the formal air source; the third valve is arranged on the second branch to control the opening and closing of the temporary air source.

[0015] A large vertical centrifugal pump device comprises a centrifugal pump body and the above-mentioned airbag sealing and pressure maintaining system, wherein the airbag sealing and pressure maintaining system is used for sealing the centrifugal pump body.

[0016] Optionally, the centrifugal pump body includes a pump shaft, a pump cover and a protective sleeve, the pump cover and the protective sleeve are both sleeved on the outside of the pump shaft, and the pump cover extends radially along the pump shaft, and the protective sleeve extends axially along the pump shaft; the large vertical centrifugal pump equipment also includes an airbag sealing cover and an airbag sealing seat, the airbag sealing seat and the protective sleeve are distributed at intervals along the radial direction of the pump shaft, the airbag sealing cover and the pump cover are distributed at intervals along the axial direction of the pump shaft, and the airbag sealing seat, the pump cover, the protective sleeve and the airbag sealing cover define a sealing cavity, and the airbag is arranged in the sealing cavity.

[0017] The beneficial effects of the large vertical centrifugal pump equipment and the airbag sealing and pressure maintaining system provided by the embodiments of the utility model include:

[0018] The embodiment of the utility model provides an airbag sealing and pressure-maintaining system, which includes an airbag sealing component, a pressure gauge, an alarm, and a connecting wire. The airbag sealing component includes an air source, a connecting air path, a first valve, and an airbag. The air source is connected to the airbag through the connecting air path, and the first valve is arranged on the connecting air path, so that the on and off of the air source and the airbag are controlled by the first valve. The pressure gauge is used to detect the pressure of the airbag, and the alarm is electrically connected to the pressure gauge through the connecting wire. Since there is basically no signal at the position where the airbag and the pressure gauge are located, the pressure information detected by the pressure gauge can be output to the alarm through the connecting wire. When installed, the alarm can be set outside the narrow space. When the pressure of the airbag exceeds the threshold, an alarm signal is sent out through the alarm. In this way, there is no need for manual frequent entry and exit of the narrow space to detect the airbag pressure. It is only necessary to enter and operate when the alarm signal is obtained, which greatly reduces the frequency of personnel entering and exiting the narrow space, helps to reduce the workload, and reduces the possibility of safety problems.

[0019] The embodiment of the utility model also provides a large vertical centrifugal pump device, which includes the above-mentioned airbag sealing and pressure-maintaining system. Since the large vertical centrifugal pump device includes the above-mentioned airbag sealing and pressure-maintaining system, it also has the beneficial effect of greatly reducing the frequency of personnel entering and exiting a narrow space, helping to reduce workload and reducing the possibility of safety problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above features and advantages of the present invention can be better understood after reading the detailed description of the embodiments of the present disclosure in conjunction with the following drawings. In the drawings, the components are not necessarily drawn to scale, and components with similar related properties or features may have the same or similar reference numerals.

[0021] Figure 1 A structural schematic diagram of a large vertical centrifugal pump device provided according to one aspect of the utility model is shown.

[0022] Reference numerals:

[0023] 10-Large vertical centrifugal pump equipment; 100-Centrifugal pump body; 111-Pump shaft; 112-Pump cover; 113-Protective cover; 211-Sealing chamber; 212-Airbag sealing cover; 213-Airbag sealing seat; 300-Airbag sealing pressure maintaining system; 311-Formal air source; 312-Temporary air source; 320-Connecting air circuit; 321-Main air circuit; 322-First branch; 323-Second branch; 331-First valve; 332-Second valve; 333-Third valve; 340-Airbag; 350-Pressure gauge; 360-Connecting wire; 370-Alarm; 371-Alarm unit. DETAILED DESCRIPTION

[0024] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. Note that the aspects described below in conjunction with the accompanying drawings and specific embodiments are only exemplary and should not be construed as limiting the scope of protection of the present invention.

[0025] In the description of the present utility model, it should be noted that if the terms "upper", "lower", "inside", "outside", "vertical" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when used, rather than indicating or implying that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model.

[0026] At the same time, it should be noted that the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified or limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, an integral connection, or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or the internal communication of two components, etc. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Figure 1 This is a schematic diagram of the structure of a large vertical centrifugal pump device 10 provided in this embodiment. Figure 1 This embodiment provides an airbag sealing and pressure-maintaining system 300, and also provides a large vertical centrifugal pump device 10. The large vertical centrifugal pump device 10 is used to provide stable cooling water for the heat source of nuclear power and thermal power plants. Specifically, the main medium of the large vertical pump is a non-corrosive liquid at room temperature, which can be connected to an inlet and outlet pipe system with a diameter of up to 3m, and can provide an outlet flow of up to 2000m 3 / min power.

[0029] The large vertical centrifugal pump device 10 comprises a centrifugal pump body 100 and an airbag sealing and pressure-maintaining system 300. The airbag sealing and pressure-maintaining system 300 is used to seal the centrifugal pump body 100 when it is shut down, thereby preventing seawater from flowing back.

[0030] The airbag sealing and pressure-maintaining system 300 includes an airbag sealing assembly, a pressure gauge 350, an alarm 370, and a connecting wire 360. The airbag sealing assembly includes an air source, a connecting air path 320, a first valve 331, and an airbag 340. The air source is connected to the airbag 340 through the connecting air path 320, and the first valve 331 is arranged on the connecting air path 320, so that the first valve 331 controls the on-off of the air source and the airbag 340. The pressure gauge 350 is used to detect the pressure of the airbag 340. The alarm 370 is electrically connected to the pressure gauge 350 via the connecting wire 360. Since there is basically no signal at the position where the airbag 340 and the pressure gauge 350 are located, the pressure information detected by the pressure gauge 350 can be output to the alarm 370 via the connecting wire 360. During installation, the alarm 370 can be set outside the narrow space. When the pressure of the airbag 340 exceeds the threshold, an alarm signal is sent out through the alarm 370. In this way, there is no need for manual operation to frequently enter and exit the narrow space to detect the pressure of the airbag 340. It is only necessary to enter and operate when the alarm signal is obtained, which greatly reduces the frequency of personnel entering and exiting the narrow space, helps to reduce workload, and reduces the possibility of safety problems.

[0031] Optionally, the pressure gauge 350 is connected to the connecting air path 320 and is located on the side of the first valve 331 close to the airbag 340 , so that the air pressure value in the airbag 340 is obtained by detecting the air pressure in the pipeline between the first valve 331 and the airbag 340 .

[0032] Furthermore, if Figure 1 As shown, the centrifugal pump body 100 includes a pump shaft 111, a pump cover 112 and a protective sleeve 113. The pump cover 112 and the protective sleeve 113 are both sleeved outside the pump shaft 111, and the pump cover 112 extends radially along the pump shaft 111, and the protective sleeve 113 extends axially along the pump shaft 111. At the same time, the large vertical centrifugal pump equipment 10 also includes an airbag sealing cover 212 and an airbag sealing cover 213. The airbag sealing cover 213 and the protective sleeve 113 are spaced apart along the radial direction of the pump shaft 111, and the airbag 340 seals the airbag 340 and the pump cover 112 along the axial direction of the pump shaft 111. In this way, an annular sealing chamber 211 distributed around the pump shaft 111 is defined by the airbag sealing cover 213, the pump cover 112, the protective sleeve 113 and the airbag sealing cover 212, and the airbag 340 is arranged in the sealing chamber 211. When the centrifugal pump body 100 is shut down, the airbag 340 is inflated to fill the sealing cavity 211 , thereby sealing the centrifugal pump body 100 .

[0033] In this embodiment, a pressure differential electric signal transmitter is provided at the pressure gauge 350, and the pressure differential electric signal transmitter is connected to the alarm 370 via the connecting wire 360, so as to realize the communication between the pressure differential electric signal transmitter and the alarm 370. A preset pressure threshold is pre-set in the pressure differential electric signal transmitter, and the pressure differential electric signal transmitter makes a difference between the pressure value detected by the pressure gauge 350 and the threshold, and transmits the difference to the alarm 370 via the connecting wire 360, and the alarm 370 determines whether an alarm is needed according to the difference. Specifically, when the pressure of the airbag 340 exceeds the threshold, the alarm 370 sends an alarm signal.

[0034] Optionally, the alarm 370 includes an alarm unit 371, and the alarm unit 371 is used to send out at least one of an alarm sound signal and an alarm light signal. Accordingly, the alarm signal sent by the alarm 370 may include the alarm sound signal and / or the alarm light signal. Optionally, the alarm unit 371 may be configured to include a speaker structure, and an alarm sound signal is sent out through the speaker structure when an alarm is required. At the same time, the alarm unit 371 may also be configured to include a warning light and other structures, so that when an alarm is required, a flashing light may be sent out through the warning light as an alarm light signal. It is understandable that in some other embodiments, the structure of the alarm unit 371 may also be specifically set according to requirements. Optionally, the sound and light alarm signal may be broadcast continuously until the pressure of the airbag 340 is within a preset range and the alarm stops.

[0035] Furthermore, the alarm 370 also includes a signal transmitter (not shown), which is used to transmit a wireless signal containing alarm information to the cloud network. Accordingly, the alarm signal emitted by the alarm 370 may also include the wireless signal. In this way, the wireless signal can be transmitted to a terminal such as a mobile phone through the cloud network, so that the on-duty personnel can obtain the alarm signal in real time and conveniently.

[0036] In this embodiment, the gas source includes a formal gas source 311 and a temporary gas source 312, and the connecting gas path 320 includes a first branch 322 and a second branch 323, the first branch 322 is connected to the formal gas source 311, and the second branch 323 is connected to the temporary gas source 312. Specifically, the connecting gas path 320 also includes a main gas path 321, which has an air inlet end and an air outlet end. One end of the first branch 322 is connected to the formal air source 311, and the other end of the first branch 322 is connected to the air inlet end, so that the formal air source 311 and the main air circuit 321 are connected through the first branch 322; one end of the second branch 323 is connected to the temporary air source 312, and the other end of the second branch 323 is connected to the air inlet end, so that the temporary air source 312 and the main air circuit 321 are connected through the second branch 323; the air outlet end of the main air circuit 321 is connected to the airbag 340, and the first valve 331 is set on the main air circuit 321 to control the on and off of the main air circuit 321.

[0037] The airbag sealing assembly further includes a second valve 332 and a third valve 333. The second valve 332 is disposed on the first air path to control the on-off of the first air path through the second valve 332, thereby controlling the on-off of the formal air source 311; the third valve 333 is disposed on the second air path to control the on-off of the second air path through the third valve 333, thereby controlling the on-off of the temporary air source 312. During the process of inflating the airbag 340, the on-off of the second valve 332 and the third valve 333 can be selected and controlled according to demand.

[0038] The airbag sealing and pressure-maintaining system 300 and the large vertical centrifugal pump device 10 provided by the embodiment of the utility model are provided with an alarm 370 connected to the wire of the pressure difference electric signal transmitting device, and the alarm 370 is installed outside a narrow space without a signal (for example, the outside of the motor foundation of the centrifugal pump body 100), so that it can be determined whether an alarm is needed according to the difference between the pressure of the airbag 340 and the preset threshold value. The alarm mode can be set to alarm through sound and light signals, which is helpful to find the alarm situation at the first time on the spot; it can also be set to notify the personnel of the alarm information by sending text messages, WeChat, telephone, etc., which is convenient for remote monitoring. In addition, in order to ensure that the airbag sealing and pressure-maintaining system 300 can accurately alarm during use, the airbag sealing and pressure-maintaining system 300 can also be verified after installation. Specifically, after the airbag 340 is inflated to the preset pressure range, the air source is first disconnected, and the airbag 340 is controlled to be slowly exhausted, so that the pressure in the airbag 340 is slowly reduced to beyond the preset pressure range. If the alarm 370 alarms normally, it means that the alarm is normal. It is understandable that the alarm function can also be verified by continuing to inflate the airbag 340 so that the pressure is higher than the preset pressure range.

[0039] At the same time, the alarm 370 can also be set to sound an alarm when the pressure gauge 350 fails. In this way, the airbag sealing and pressure-maintaining system 300 and the large vertical centrifugal pump device 10 realize automatic monitoring of the pressure of the airbag 340 when the centrifugal pump is shut down, which can effectively reduce the frequency of pressure detection by the staff, thereby reducing the workload and reducing the possibility of safety problems.

[0040] The embodiment of the utility model further provides a method for alarming the pressure of the airbag 340, which is used in the airbag sealing and pressure-maintaining system 300. In other words, the method for alarming the pressure of the airbag 340 is implemented based on the airbag sealing and pressure-maintaining system 300. Specifically, the method for alarming the pressure of the airbag 340 includes:

[0041] S01: Acquire a pressure signal representing the pressure of the airbag 340 .

[0042] The upper and lower extreme values ​​of the pressure gauge 350 are set, and the pressure of the airbag 340 is detected by the pressure gauge 350. After the pressure difference electric signal transmitter obtains the pressure of the airbag 340 detected by the pressure gauge 350, the pressure difference is calculated according to the upper and lower extreme values ​​of the pressure gauge 350, and the signal representing the pressure difference is output to the outside through the connecting wire 360.

[0043] S02: Determine whether the pressure is within a preset range.

[0044] It is to be noted that in this embodiment, whether the pressure of the airbag 340 is within the preset range is judged based on the pressure difference data. It is understandable that in some other embodiments, whether the pressure is within the preset range can also be judged based on the actual pressure value.

[0045] The minimum value of the preset range should be set greater than the design value of the airbag 340 pressure holding pressure. For example, according to calculation, the design pressure value of the airbag 340 during sealing and pressure holding should be 0.38Mpa, then the preset range can be set to 0.4Mpa~0.5Mpa, so that the lower extreme value of the pressure gauge 350 is 0.4Mpa, and the upper extreme value of the pressure gauge 350 is 0.5Mpa. When the pressure difference electrical signal transmitting device calculates the pressure difference, the lower extreme value can be used as the reference value, that is, after subtracting the measured airbag 340 pressure from the reference value, if the difference is negative, it means that the airbag 340 pressure is too low, and if the difference is greater than 0.1Mpa, it means that the airbag 340 pressure is too high.

[0046] S03: If the pressure value is not within the preset range, an alarm signal is issued.

[0047] If the pressure value is higher than the upper limit or lower than the lower limit, the alarm unit 371 is controlled to give an audible / visual alarm and the signal transmitter is controlled to send a wireless signal to the cloud network.

[0048] The above is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technology in this field within the technical scope disclosed by the present invention should be included in the protection scope of the present invention.

Claims

1. An airbag sealing and pressure maintaining system, characterized in that: The airbag sealing and pressure maintaining system comprises: An airbag sealing assembly, the airbag sealing assembly comprising an air source, a connecting air path, a first valve and an airbag, the air source being connected to the airbag via the connecting air path, and the first valve being arranged on the connecting air path, and the on-off of the air source and the airbag can be controlled by the first valve; a pressure gauge, the pressure gauge being used to detect the pressure of the airbag; and An alarm and a connecting wire, wherein the alarm is electrically connected to the pressure gauge through the connecting wire, so that an alarm signal is sent out through the alarm when the pressure of the airbag exceeds a threshold value.

2. The airbag sealing and pressure maintaining system according to claim 1, characterized in that: The alarm device comprises an alarm unit, and the alarm unit is used to send out at least one of an alarm sound signal and an alarm light signal; the alarm signal comprises the alarm sound signal and / or the alarm light signal.

3. The airbag sealing and pressure maintaining system according to claim 1, characterized in that: The alarm also has a signal transmitter, which is used to transmit a wireless signal containing alarm information to the cloud network.

4. The airbag sealing and pressure maintaining system according to claim 1, characterized in that: The pressure gauge is connected to the connecting gas path, and the pressure gauge is located on a side of the first valve close to the airbag.

5. The airbag sealing and pressure maintaining system according to claim 1, characterized in that: The air source includes a formal air source and a temporary air source, the connecting air path includes a first branch connected to the formal air source and a second branch connected to the temporary air source, and the airbag sealing assembly also includes a second valve and a third valve; the second valve is arranged on the first branch to control the opening and closing of the formal air source; the third valve is arranged on the second branch to control the opening and closing of the temporary air source.

6. A large vertical centrifugal pump equipment, characterized in that: The large vertical centrifugal pump equipment comprises a centrifugal pump body and an airbag sealing and pressure maintaining system as described in any one of claims 1 to 5, wherein the airbag sealing and pressure maintaining system is used for sealing the centrifugal pump body.

7. The large vertical centrifugal pump equipment according to claim 6, characterized in that: The centrifugal pump body includes a pump shaft, a pump cover and a protective sleeve, the pump cover and the protective sleeve are both sleeved outside the pump shaft, and the pump cover extends radially along the pump shaft, and the protective sleeve extends axially along the pump shaft; the large vertical centrifugal pump equipment also includes an airbag sealing cover and an airbag sealing seat, the airbag sealing seat and the protective sleeve are distributed at intervals along the radial direction of the pump shaft, the airbag sealing cover and the pump cover are distributed at intervals along the axial direction of the pump shaft, and the airbag sealing seat, the pump cover, the protective sleeve and the airbag sealing cover define a sealing cavity, and the airbag is arranged in the sealing cavity.

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