Centrifugal air compressor pressure detection interlocking starting mechanism and control system

Abstract

The utility model relates to the field of industrial machinery, in particular to a centrifugal air compressor pressure detection interlocking starting mechanism and a control system. The system comprises a power supply, a centrifugal air compressor, a power distribution cabinet, a pressure sensor, a digital display instrument and an outlet pipeline. The power source provides power for the system, and the air compressor is driven by the power source and conveys compressed air to the outlet pipeline. The pressure sensor is installed on an outlet pipeline and used for detecting gas pressure and converting pressure signals into electric signals, and the digital display instrument displays the pressure values in real time. In addition, the utility model further comprises a pressure detection interlocking starting mechanism which detects pressure through a pressure sensor, activates a pressure switch when the pressure exceeds a preset threshold value, and cuts off power supply of a starting switch through a control circuit, so that the centrifugal air compressor is prevented from being started under an unsafe pressure condition. According to the technical scheme, the safety and the reliability of the system are enhanced, and the operation efficiency and the maintenance convenience are improved.

Description

Technical Field

[0001] The utility model belongs to the field of industrial automation control, and particularly relates to a centrifugal air compressor pressure detection interlock starting mechanism and control system. Background Technique

[0002] In the production process of float glass, nitrogen is an essential protective gas for the tin bath, and the centrifugal air compressor, as a key device in the air separation nitrogen production system, needs to operate stably for a long time. However, due to the switching of the dual-circuit power supply system and the regular shutdown maintenance of the centrifugal air compressor, the equipment will inevitably experience frequent shutdown and startup processes. At present, the pressure direction in the air supply system is opposite to the outlet pressure of a single centrifugal air compressor, which means that if the centrifugal air compressor is started under pressure, serious damage may be caused to its internal components. The prior art mainly relies on a check valve installed in the outlet pipeline of the centrifugal air compressor to prevent the backflow of system force. However, when the check valve fails and leaks air, the system cannot detect the pressure inside the centrifugal air compressor, easily leading to starting under pressure, thereby damaging key components such as the impeller, the last-stage high-speed shaft, and the bearing.

[0003] The existing starting mode is to directly start the equipment through a button on the control panel, without being interlocked with the internal pressure of the equipment, and it is easy to start under pressure. In addition, the existing pressure detection mode can only detect the pressure of the outlet pipeline after the check valve of the centrifugal compressor, and fails to detect the internal pressure of the equipment. It is necessary to manually judge whether the starting conditions are met, and there is a risk of missed detection and incorrect manual judgment.

[0004] CN200820062632.0 discloses an energy-saving controller for an inflation device, which realizes air pressure control through an air pressure sensor and a one-way air pressure valve. Although this patent has advantages in energy saving and structural simplification, its design cannot meet the strict requirements of the centrifugal air compressor for pressure detection and starting interlock.

[0005] The technical problems faced by the prior art mainly include:

[0006] 1. The problem of starting the centrifugal air compressor under pressure: Since only a check valve installed in the outlet pipeline of the centrifugal air compressor is relied on in the existing system to prevent the backflow of system force, when the check valve fails and leaks air, the pressure inside the centrifugal air compressor cannot be detected, easily causing starting under pressure and thus damaging the internal components.

[0007] 2. Inaccurate judgment of starting conditions: In the prior art, the internal pressure of the equipment is not detected, and only manual judgment can be used to determine whether the starting conditions are met. It is very easy to have missed detection and incorrect judgment, resulting in equipment damage.

[0008] 3. Inconvenient detection: In the prior art, operators cannot conveniently obtain the internal pressure state of a centrifugal air compressor, resulting in low detection work efficiency. Summary of the Utility Model

[0009] The purpose of the present utility model is to provide a pressure detection and interlock starting mechanism and control system for a centrifugal air compressor in view of the problems existing in the prior art. It aims to solve the problem of component damage that may be caused by starting under pressure by automatically detecting the internal pressure of the centrifugal air compressor and evaluating the starting conditions, and enhance the safety during system startup.

[0010] To achieve the above purpose, the solution adopted by the present utility model is as follows:

[0011] In the first aspect, a centrifugal air compressor detection control system is provided, including:

[0012] Power supply: Input the power supply into the power distribution cabinet.

[0013] Centrifugal air compressor: Driven by the power supply, its outlet is directly connected to the outlet pipeline, responsible for compressing gas and transporting it.

[0014] Power distribution cabinet: Electrically connected to the power supply, controlling and distributing power to the centrifugal air compressor and other electrical equipment.

[0015] Pressure sensor: Located inside the outlet pipeline, used to detect the gas pressure in the pipeline.

[0016] Digital display instrument: Electrically connected to the power distribution cabinet, receiving the electrical signal from the pressure sensor and displaying the pressure reading in real time.

[0017] Among them, the pressure sensor includes a sampling tube and a pressure measuring probe. One end of the sampling tube is fixedly connected to the pressure measuring probe, and the other end is electrically connected to the power distribution cabinet. The pressure measuring probe is directly inserted into the outlet pipeline to contact the air flow to detect the pressure. The pressure measuring probe contains a pressure sensitive element, with a pressure measurement range of 0 to 1 MPa, and converts the pressure signal into an electrical signal.

[0018] The digital display instrument is electrically connected to the power distribution cabinet, configured to receive the electrical signal from the pressure sensor, and used to display the measured pressure value in real time.

[0019] The sampling tube is connected to the outlet pipeline through a bracket. The bracket is independently arranged near the outlet pipeline and fixed through the ground structure.

[0020] It includes a distributed control system and a process interface to display the pressure value, configured to receive the electrical signal and convert it into a pressure value for real-time display.

[0021] In the second aspect, the present utility model also provides a pressure detection and interlock starting mechanism for a centrifugal air compressor, including:

[0022] A pressure sensor is configured in the outlet pipeline of a centrifugal air compressor to detect pressure in real time and generate an electrical signal.

[0023] The pressure switch is electrically connected to the pressure sensor, receives the electrical signal, and is activated when the detected pressure exceeds a preset threshold.

[0024] The control circuit is electrically connected to the pressure switch and is used to cut off the power supply to the start switch when the pressure switch is activated, preventing the unit from starting.

[0025] The start switch is configured to control the start of the centrifugal air compressor and is activated when the control circuit allows the power supply.

[0026] Compared with the prior art, the beneficial effects of the present utility model

[0027] 1. By installing the pressure sensor directly on the outlet pipeline of the centrifugal air compressor, the present utility model can detect the pressure in the pipeline in real time, rather than simply relying on the check valve to prevent gas backflow. In this way, even if the check valve fails and leaks, the system can still detect the internal pressure, preventing starting under pressure and thus protecting the internal components from damage.

[0028] 2. Through real-time pressure detection and using the pressure sensor to convert physical pressure into an electrical signal, the present utility model allows the automated control system to determine whether the start conditions are met based on the actual pressure data. This reduces the inaccuracy of relying on manual judgment and lowers the risk of equipment damage caused by misoperation.

[0029] 3. Compared with the traditional system, the present utility model directly displays the pressure reading through a digital display instrument and cooperates with the distributed control system to monitor the pressure status in real time. This enables the operator to obtain the pressure information conveniently and quickly, greatly improving the efficiency and convenience of detection. Description of the Drawings

[0030] Figure 1 It is a diagram of the pressure detection and control system in Embodiment 2 of the present utility model;

[0031] Reference numerals: 1 - sampling pipe; 2 - digital display instrument; 3 - outlet check valve; 4 - outlet stop valve; 5 - outlet pipeline; 6 - pressure measuring probe;

[0032] Figure 2 It is a control circuit diagram in Embodiment 2 of the present utility model;

[0033] Figure 3 It is an electrical control circuit diagram in Embodiment 2 of the present utility model;

[0034] Figure 4 It is a schematic diagram of the digital display instrument in Embodiment 2 of the present utility model. Detailed Embodiment

[0035] The present utility model will be further described in detail below in conjunction with embodiments and specific implementation manners. However, it should not be understood that the scope of the above-mentioned subject matter of the present utility model is limited to the following embodiments. All technologies implemented based on the content of the present utility model belong to the scope of the present utility model.

[0036] Embodiment 1

[0037] This embodiment provides a centrifugal air compressor detection and control system, including:

[0038] Power supply: Input the power supply into the power distribution cabinet.

[0039] Centrifugal air compressor: Driven by the power supply, its outlet is directly connected to the outlet pipeline, responsible for compressing gas and transporting it.

[0040] Power distribution cabinet: Electrically connected to the power supply, controlling and distributing electric power to the centrifugal air compressor and other electrical equipment.

[0041] Pressure sensor: Located inside the outlet pipeline, used to detect the gas pressure in the pipeline.

[0042] Digital display instrument: Electrically connected to the power distribution cabinet, receiving the electrical signal from the pressure sensor and displaying the pressure reading in real time.

[0043] Among them, the pressure sensor includes a sampling tube and a pressure measuring probe. One end of the sampling tube is fixedly connected to the pressure measuring probe, and the other end is electrically connected to the power distribution cabinet. The pressure measuring probe is directly inserted into the outlet pipeline, contacting the air flow to detect the pressure. The pressure measuring probe contains a pressure sensitive element, with a pressure measurement range of 0 to 1 MPa, and converting the pressure signal into an electrical signal.

[0044] The digital display instrument is electrically connected to the power distribution cabinet, configured to receive the electrical signal from the pressure sensor, and used to display the measured pressure value in real time.

[0045] The sampling tube is connected to the outlet pipeline through a bracket. The bracket is independently arranged near the outlet pipeline and fixed through the ground structure.

[0046] Including a distributed control system and a process interface to display the pressure value, configured to receive the electrical signal and convert it into a pressure value for real-time display.

[0047] Furthermore, this embodiment also provides a centrifugal air compressor pressure detection and interlock startup mechanism, including:

[0048] Pressure sensor, configured in the outlet pipeline of the centrifugal air compressor, used to detect the pressure in real time and generate an electrical signal.

[0049] The pressure switch is electrically connected to the pressure sensor, receiving the electrical signal and activating when the detected pressure exceeds the preset threshold.

[0050] The control circuit is electrically connected to the pressure switch and is used to cut off the power supply to the start switch when the pressure switch is activated, preventing the unit from starting.

[0051] The start switch is configured to control the start of the centrifugal air compressor and is activated when the control circuit allows the power supply.

[0052] Embodiment 2

[0053] As a further optimization of the foregoing embodiment, as Figure 1 shown, a centrifugal air compressor detection and control system according to the present utility model includes: a power supply, a centrifugal air compressor, an outlet pipe (5), a power distribution cabinet, a pressure sensor, a digital display instrument (2), and a distributed control system.

[0054] In the centrifugal air compressor system, the power supply is the main power source, responsible for driving the air compressor to compress gas. The power supply delivers electricity to the power distribution cabinet, which is responsible for controlling and distributing electricity to the air compressor and other electrical equipment in the system. The outlet of the air compressor is directly connected to the outlet pipe (5), which is responsible for transporting the compressed gas to the next part of the system.

[0055] Figure 1 It also includes an outlet check valve (3) and an outlet stop valve (4), which are two important mechanical valves installed on the outlet pipe (5) of the centrifugal air compressor. The outlet check valve (3) is mechanical, and its main function is to ensure that the gas can only flow in one direction and prevent the compressed gas from flowing back into the compressor, protecting the equipment and the system. This valve usually opens automatically when there is no reverse pressure and closes when encountering reverse pressure.

[0056] The outlet stop valve (4) is usually in the open state, and it allows the operator to manually or automatically close it when needed, thus completely cutting off the gas flow. This ability enables the safe isolation of the air compressor during system maintenance or emergency operations.

[0057] Under normal operating conditions, if the pressure in the outlet pipe (5) exceeds the set safety threshold, these two valves will automatically remain closed to prevent any possible safety issues. If it is detected that the pressure from the external system exceeds the pressure inside the air compressor system, this usually indicates that the outlet check valve (3) may have failed. In this case, the pressure switch in the system will prevent the unit from starting, avoiding operation under potentially dangerous pressure conditions and thus ensuring the safe operation of the system.

[0058] The pressure sensor system consists of a sampling pipe (1) and a pressure measuring probe (6). One end of the sampling pipe (1) is fixed to the pressure measuring probe (6) through a bolt structure, and the pressure measuring probe (6) is made of rigid material to resist damage that may be caused by pressure fluctuations. The pressure measuring probe (6) directly penetrates into the outlet pipe (5), and the penetration position of the pressure measuring probe (6) is between the outlet check valve (3) and the outlet of the air compressor, directly contacting the air flow to detect the pressure signal. Inside the pressure measuring probe (6), there is a pressure sensitive element, and the pressure measuring range of this element is 0 to 1 MPa, which converts the pressure signal into an electrical signal.

[0059] The sampling pipe (1) is electrically connected to the power distribution cabinet, and this electrical signal is transmitted to the power distribution cabinet. At the same time, the sampling pipe (1) is electrically connected to a digital display instrument (2). The digital display instrument (2) is directly electrically connected to the power distribution cabinet and is controlled by it to display the pressure reading in real time, enabling the operator to monitor and adjust the pressure in real time to ensure that the system operates in a safe and efficient state.

[0060] This electrical signal is also transmitted to the distributed control system. The pressure switch is connected to the pressure sensor. If pressure is detected in the shutdown state, the interlock mechanism will prevent the unit from starting to prevent the system from operating under unsafe pressure conditions.

[0061] A pressure detection and interlock starting mechanism for a centrifugal air compressor includes: a pressure sensor configured in the outlet pipe (5) of the centrifugal air compressor for detecting pressure in real time and generating a corresponding electrical signal; a pressure switch electrically connected to the pressure sensor, receiving the electrical signal from the pressure sensor, and activating when the detected pressure exceeds a preset threshold; a control circuit electrically connected to the pressure switch for disconnecting the power supply to the starting switch when the pressure switch is activated to prevent the unit from starting; a starting switch configured to control the starting of the centrifugal air compressor and activating when the control circuit allows the power supply.

[0062] The control circuit of the pressure detection and interlock starting mechanism of the centrifugal air compressor is as Figure 2 shown. The figure includes the main components and their connection methods, which are specifically described as follows:

[0063] Power supply: AC220V represents the power input voltage; QF1 represents a circuit breaker for disconnecting the power supply of the control circuit when abnormal current is detected.

[0064] Control module: U1(SWP-C401) is the wiring terminal of the control module; KA1 is an intermediate relay that disconnects the power supply to the starting switch when the pressure switch is activated, preventing the centrifugal air compressor from starting when the pressure exceeding the preset pressure threshold is detected; SB1 is the starting switch for controlling the starting or stopping of the centrifugal air compressor.

[0065] Wiring Instructions: The power supply is provided through circuit breaker QF1. L (phase wire) and N (neutral wire) are connected to control module U1. The contacts of intermediate relay KA1 are connected to the corresponding terminals of control module U1 for controlling signal transmission. The grounding part shows the grounding connection of the device to ensure the safe operation of the device.

[0066] Figure 3 It is a simplified electrical control circuit diagram showing the start or stop of the centrifugal air compressor circuit controlled by intermediate relay KA1 and start switch SB1.

[0067] Through the detection and control system of the centrifugal air compressor, all-weather pressure monitoring can be achieved. The detected values can be clearly shown on the digital display instrument (2), which helps the operator to carry out on-site detection work. And the pressure value is transmitted to the control cabinet and can be introduced into the distributed control system (DCS) in the central control room for remote monitoring as needed. According to the detected pressure value, a new start control is added, and the pressure value is used as one of the start conditions for start interlock control, effectively avoiding component damage caused by equipment start with insufficient start conditions.

[0068] Figure 4 It shows a schematic diagram of the pressure display panel of the digital display instrument (2). By displaying the pressure value in real time on the pressure display panel, the operator can intuitively monitor the operating state of the centrifugal air compressor, ensure that the system operates within a safe pressure range, and prevent equipment damage and safety accidents caused by abnormal pressure.

[0069] System Components and Their Connection Relationships:

[0070] Distribution Cabinet: The distribution cabinet is responsible for receiving external power supply and safely and reliably distributing power to the high-voltage motor of the centrifugal air compressor. It is internally equipped with circuit breaker QF1, intermediate relay KA1 and start switch SB1, which are used to quickly cut off the power supply in case of abnormal conditions to protect the system from electrical faults.

[0071] The control module receives the electrical signal provided by the pressure sensor and controls the start and stop of the centrifugal air compressor according to the set pressure threshold.

[0072] Embodiment 3

[0073] As a further optimization of the foregoing embodiments, in order to reduce the influence of external factors on pressure detection, a bracket independent of the outlet pipeline of the centrifugal air compressor is specially designed. This design significantly reduces the interference of pipeline vibration on the pressure sensor during normal operation, ensuring the stability and accuracy of the sensor performance. The bracket is fixed using a ground-based structure, including a fixed seat and fixing bolts, for directly anchoring the bracket to the ground to improve the overall stability and shock resistance of the system. In addition, the bracket is also equipped with a manual adjustment mechanism, enabling the operator to adjust the position of the pressure sensor according to actual needs, ensuring high-precision and reliable pressure detection.

[0074] Embodiment 4

[0075] As a further optimization of the foregoing embodiments, a gauge pressure sensor is adopted to improve the direct detection ability of the system. The pressure-sensitive element of this gauge pressure sensor is precisely placed at a specific opening position of the outlet pipeline, thereby directly detecting the pressure within the system. The collected pressure values are sent to the signal processing unit through a numerical transmission line, where the values are converted into digital signals and displayed on the pressure display panel of the control panel. This configuration not only facilitates the operator to directly read the real-time values on-site but also allows remote monitoring of the pressure status through the user interface of the control system, greatly enhancing the interactivity and response speed of the system.

[0076] Embodiment 5

[0077] As a further optimization of the foregoing embodiments, the pressure switch system is designed to include an intermediate relay and a circuit breaker and is directly integrated with the start-up and shutdown control circuits of the centrifugal air compressor. This configuration enables the analog pressure signal received from the pressure sensor to be converted into an electrical signal and amplified and processed through the relay. This allows precise electronic control of the start-up and stop of the centrifugal air compressor. This technical design significantly improves the automation level and response speed of the system, making the operation process safer and more reliable.

[0078] Embodiment 6

[0079] As a further optimization of the foregoing embodiments, the system in this embodiment is designed to allow the transmission of real-time pressure detection values to the distributed control system. By displaying these pressure values on the process interface of the distributed control system, the operator can perform real-time monitoring and response.

[0080] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A centrifugal air compressor detection and control system, characterized in that, Comprising: A power supply, inputting power to a power distribution cabinet; A centrifugal air compressor, driven by the power supply, and its outlet is directly connected to an outlet pipe (5); A power distribution cabinet, electrically connected to the power supply, controlling and distributing electric power to the centrifugal air compressor and other electrical equipment; A pressure sensor, located inside the outlet pipe (5); A digital display instrument (2), electrically connected to the power distribution cabinet, receiving an electrical signal from the pressure sensor.

2. The centrifugal air compressor detection and control system according to claim 1, wherein The pressure sensor includes a sampling pipe (1) and a pressure measuring probe (6); one end of the sampling pipe (1) is fixedly connected to the pressure measuring probe (6); the pressure measuring probe (6) directly extends into the outlet pipe (5) for directly contacting the air flow to detect a pressure signal; the pressure measuring probe (6) contains a pressure sensitive element inside and converts the detected pressure signal into an electrical signal, and this electrical signal is transmitted to the power distribution cabinet through the electrical connection of the sampling pipe (1).

3. The centrifugal air compressor detection and control system according to claim 1, wherein, The digital display instrument (2) is electrically connected to the power distribution cabinet and is configured to receive the electrical signal from the pressure sensor for real-time displaying the measured pressure value.

4. The centrifugal air compressor detection control system according to claim 2, wherein, The sampling pipe (1) is installed on a bracket; the bracket is independently arranged near the outlet pipe (5) and is fixed by a ground-based structure; the bracket further includes a fixing base and fixing bolts for anchoring the bracket to the ground.

5. The centrifugal air compressor detection and control system according to claim 1, characterized in that, It further includes a distributed control system and a process interface with a displayed pressure value; the distributed control system is configured to receive the electrical signal and convert the electrical signal into a pressure value; the process interface will display the pressure value in real time.

6. A pressure detection and interlock starting mechanism for a centrifugal air compressor, characterized in that, Comprising: A pressure sensor, configured in the outlet pipe (5) of the centrifugal air compressor for real-time detecting pressure and generating a corresponding electrical signal; A pressure switch, electrically connected to the pressure sensor, receiving the electrical signal from the pressure sensor and being activated when detecting that the pressure exceeds a preset threshold; a control circuit, electrically connected to the pressure switch, for disconnecting the power supply to the start switch when the pressure switch is activated to prevent the unit from starting; A start switch, configured to control the start of the centrifugal air compressor and being activated when the control circuit allows the power supply.

7. The pressure detection and interlock starting mechanism of a centrifugal air compressor according to claim 6, characterized in that, The preset threshold is set based on the safety operation parameters of the centrifugal air compressor; further, the pressure measuring range of the pressure sensor is 0 to 1 MPa.

8. The pressure detection and interlock starting mechanism of a centrifugal air compressor according to claim 6, characterized in that, The control circuit further includes an intermediate relay KA1, and the intermediate relay KA1 disconnects the power supply to the start switch when the pressure switch is activated to prevent the centrifugal air compressor from starting when detecting a pressure exceeding the preset pressure threshold.

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