Internal flow type sealing pressure maintaining system

Abstract

The invention relates to the technical field of pressure control and sealing systems, in particular to an internal flow type sealing pressure maintaining system which comprises a water supply unit used for providing a water source for an internal flow type seal, the water supply unit comprises a water tank and a variable frequency water pump, the water tank is used for storing the water source, and the variable frequency water pump conveys water in the water tank to the internal flow type seal; the pressure adjusting unit comprises a pressure reducing valve, and the pressure reducing valve is arranged on the water supply pipeline between the variable frequency water pump and the internal flow type seal; the pressure detection unit comprises a pressure sensor, and the pressure sensor is arranged at the internal flow type sealing position or the shell end cover position; and the control unit is electrically connected with the pressure sensor, the variable-frequency water pump and the pressure reducing valve and used for receiving pressure data output by the pressure sensor and adjusting the rotating speed of the variable-frequency water pump and the opening degree of the pressure reducing valve according to a preset pressure range. The internal pressure of the shell is prevented from being larger than the water supply pressure of an internal flow type sealing system, internal liquid backflow is avoided, and a stable working environment is created for mechanical sealing.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure control and sealing systems, and in particular to an internal flow sealing pressure maintaining system. Background Art

[0002] Currently, mechanical seals primarily offer two drainage methods: internal flow and external flow. These methods prevent particles from entering the housing and potentially damaging the seal. Internal-drain mechanical seals require that the water supply pressure exceed the internal pressure of the housing by a fixed value. However, unstable water supply pressures in industrial sites significantly reduce the service life of the seals. This not only increases equipment maintenance costs but can also lead to safety hazards such as leaks due to seal failure, compromising the efficiency and safety of the entire production process. Summary of the Invention

[0003] The purpose of the present invention is to provide an internal flow sealing and pressure maintaining system that can solve the above technical problems.

[0004] The present invention provides an internal flow sealing and pressure maintaining system, comprising:

[0005] A water supply unit is used to provide water to the inflow seal. The water supply unit includes a water tank and a variable frequency water pump. The water tank is used to store water. The variable frequency water pump transports water in the water tank to the inflow seal through a water supply pipe.

[0006] The pressure regulating unit includes a pressure reducing valve, which is arranged on the water supply pipe between the variable frequency water pump and the inflow seal and is used to regulate the pressure of the water output by the variable frequency water pump;

[0007] A pressure detection unit, comprising a pressure sensor, wherein the pressure sensor is provided at an inner flow seal or an end cover of the housing;

[0008] The control unit is electrically connected to the pressure sensor, the variable frequency water pump and the pressure reducing valve, and is used to receive pressure data output by the pressure sensor and adjust the speed of the variable frequency water pump and the opening of the pressure reducing valve according to a preset pressure range.

[0009] Preferably, the water tank is provided with a water replenishing port and a water level monitoring device. The water replenishing port is used to replenish the water source in the water tank. The water level monitoring device is used to monitor the water level in the water tank in real time and output the water level data to the control unit.

[0010] Preferably, the pressure regulating unit further comprises a pressure stabilizing tank, which is connected to the pipeline between the pressure reducing valve and the inflow seal and is used to stabilize the water flow. An air bag is provided in the pressure stabilizing tank, and the air bag expands or contracts as the water flow pressure changes.

[0011] Preferably, the pressure regulating unit also includes a safety valve installed in the pipeline between the pressure-surge tank and the inflow seal. When the water supply pressure exceeds the set pressure value of the safety valve, the safety valve automatically opens to discharge excess water. A pressure gauge is also installed in the pipeline between the variable frequency water pump and the pressure reducing valve to monitor the pressure of the pressurized water output from the variable frequency water pump.

[0012] Preferably, the control unit is further connected to a display device, and the display device is used to display water supply pressure and water tank water level information in real time.

[0013] Preferably, a flow sensor is further provided on the water supply pipe, and the flow sensor is electrically connected to the control unit for monitoring the water supply flow in real time.

[0014] Preferably, it also includes an alarm device, which is electrically connected to the control unit. When the water supply pressure and water tank water level parameters are abnormal, the control unit controls the alarm device to send out an alarm signal.

[0015] Preferably, the control unit includes a PLC controller, which is connected to the pressure detection unit and the pressure regulating unit respectively. A pressure threshold range is preset in the PLC controller. When the water supply pressure detected by the pressure detection unit exceeds the pressure threshold range, the PLC controller controls the pressure regulating unit to operate so that the water supply pressure is maintained within the pressure threshold range.

[0016] Preferably, the variable frequency water pump is a variable frequency water pump, and the speed is adjusted according to the instructions of the control unit.

[0017] Preferably, the pressure reducing valve is an electric pressure reducing valve, and the opening is adjusted by a control unit.

[0018] Beneficial effects:

[0019] The present invention monitors the pressure at the internal flow seal in real time through a pressure detection unit, and the control unit accurately adjusts the speed of the variable frequency water pump and the opening of the pressure reducing valve according to the pressure data, so as to realize dynamic regulation of the water supply pressure, ensure that the water supply pressure is always greater than the fixed value of the internal pressure of the shell, solve the problem of unstable water pressure, prevent the internal pressure of the shell from being greater than the water supply pressure of the internal flow sealing system, causing internal liquid to flow back, create a stable working environment for the mechanical seal, dynamically adapt to fluctuations in water supply pressure, and avoid damage to the seal caused by excessively high or low pressure, thereby greatly extending the service life of the mechanical seal; ensure stable operation of the seal, reduce the frequency of seal damage, and thereby reduce the number of seal replacements and equipment maintenance frequency; by stabilizing the seal working pressure, effectively avoid leakage accidents caused by seal failure, ensure the safety of the production environment, and provide reliable guarantee for the efficient and stable operation of the entire production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a schematic diagram of the overall structure of Example 1 of the present invention;

[0022] Figure 2 It is a schematic diagram of the overall structure of Example 2 of the present invention.

[0023] Explanation of the accompanying symbols: 1-water tank, 2-frequency conversion water pump, 3-pressure reducing valve, 4-pressure sensor, 5-inward flow seal, 6-housing, 7-pressure stabilizing tank, 8-safety valve, 9-pressure gauge. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Example 1

[0028] An internal flow sealing and pressure maintaining system, such as Figure 1 As shown, it includes: a water supply unit for providing water to the inflow seal, the water supply unit includes a water tank 1 and a variable frequency water pump 2, the water tank 1 is used to store water, the water tank 1 is made of high-strength corrosion-resistant material, has a large volume, and can store sufficient water, the variable frequency water pump 2 transports the water in the water tank 1 to the inflow seal 5 through a water supply pipe, the inflow seal 5 is mounted on a housing 6, and the housing can be any equipment housing requiring an inflow seal; a pressure regulating unit including a pressure reducing valve 3, which is arranged on the water supply pipe between the variable frequency water pump 2 and the inflow seal, and is used to regulate the pressure of the water output by the variable frequency water pump 2 (the variable frequency water pump and the pressure reducing valve jointly achieve water pressure regulation); a pressure detection unit including a pressure sensor 4, which is arranged at the inflow seal 5 or the housing end cover; a control unit electrically connected to the pressure sensor 4, the variable frequency water pump 2 and the pressure reducing valve 3, and is used to receive pressure data output by the pressure sensor 4 and adjust the speed of the variable frequency water pump 2 and the opening of the pressure reducing valve 3 according to a preset pressure range. The variable-frequency pump adjusts its speed based on commands from the control unit. The pressure-reducing valve is electrically operated, and its opening is adjusted by the control unit. When pressure falls below the lower limit of a preset range, the control unit sends a command to increase the variable-frequency pump speed and adjust the pressure-reducing valve opening to increase water supply and pressure. Conversely, when pressure rises above the upper limit, the variable-frequency pump speed is reduced and the pressure-reducing valve opening is adjusted to achieve dynamic balance in water supply pressure, ensuring that the internal flow seal always maintains optimal operating pressure.

[0029] The water tank is equipped with a water inlet and a water level monitoring device. The water inlet is used to replenish the water supply within the water tank, and the water level monitoring device is used to monitor the water level within the water tank in real time and output the water level data to the control unit. The water inlet adopts a standard interface design, which is convenient for connection to an external water source. It can replenish the water supply within the water tank in a timely and efficient manner, ensuring that the water level in the water tank always remains within a reasonable range. The water level monitoring device uses an ultrasonic water level sensor with high precision and non-contact measurement. It can accurately monitor the water level changes in the water tank in real time and output the water level data stably to the control unit in the form of a digital signal. The control unit can realize automatic water replenishment control based on the water level data. When the water level falls below the set value, the water replenishment program is automatically started to ensure the continuity and stability of the water supply to the water tank.

[0030] The control unit includes a PLC controller, which is connected to the pressure detection unit and the pressure regulation unit respectively. A pressure threshold range is preset in the PLC controller. When the water supply pressure detected by the pressure detection unit exceeds the pressure threshold range, the PLC controller controls the pressure regulation unit to operate so that the water supply pressure is maintained within the pressure threshold range.

[0031] The control unit is also connected to a display device that displays real-time water supply pressure and tank water level information. A flow sensor is also installed on the water supply pipe, electrically connected to the control unit, for real-time monitoring of water flow. A pressure gauge is also installed on the pipe between the variable-frequency pump and the pressure-reducing valve to monitor the pressure of the pressurized water from the variable-frequency pump. An alarm device is also included, electrically connected to the control unit. When abnormalities in water supply pressure or tank water level occur, the control unit controls the alarm device to issue an alarm signal. The alarm device consists of an audible and visual alarm and a remote alarm module, both hard-wired and wirelessly connected to the control unit. The audible and visual alarm features a high-brightness red warning light and a 110-decibel buzzer. When the water supply pressure exceeds the upper or lower limit, or the tank water level falls below the minimum warning line or rises above the maximum warning line, the control unit immediately triggers an alarm signal, with the warning light flashing and the buzzer sounding rapidly, alerting on-site personnel to take prompt action. The remote alarm module supports 4G wireless network communication and can send alarm information to the pre-set manager's mobile phone or email in the form of SMS, WeChat push or email. Even if the manager is not on site, he can obtain system abnormality information in the first time and respond quickly, effectively reducing the losses caused by failures and ensuring the safe and reliable operation of the system.

[0032] Example 2

[0033] The basic structure is the same as that of Example 1. Figure 2As shown, the pressure regulating unit also includes a pressure stabilizing tank 7, which is connected to the pipeline between the pressure reducing valve 3 and the inflow seal 5 and is used to stabilize the water flow. A rubber airbag is provided in the pressure stabilizing tank 7. The airbag expands or contracts as the water flow pressure changes. The airbag has good elasticity and corrosion resistance. The main function of the pressure stabilizing tank is to stabilize the water flow. When the water flow pressure fluctuates, the airbag will automatically expand or contract according to the pressure change. When the pressure rises, the airbag compresses and stores part of the pressure energy; when the pressure drops, the airbag expands and releases the stored energy, thereby effectively buffering the pressure fluctuations and making the water flow pressure entering the inflow seal more stable. The presence of the pressure stabilizing tank greatly improves the stability of the system water supply pressure, reduces the impact on the sealing system caused by pressure fluctuations, and extends the service life of the sealing components.

[0034] The pressure regulating unit also includes a safety valve 8, installed in the pipeline between the pressure-surge tank 7 and the inflow seal 5. When the water supply pressure exceeds the valve's set pressure, the valve automatically opens to drain excess water. The spring-loaded structure provides high sensitivity and reliable sealing. When the water supply pressure exceeds the valve's preset pressure, the valve automatically opens to drain excess water from the system, preventing damage to the equipment caused by excessive pressure. This effectively protects the inflow seal and the entire system, preventing accidents and equipment failures.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An internal flow sealing and pressure maintaining system, characterized in that: include: A water supply unit is used to provide water to the inflow seal. The water supply unit includes a water tank and a variable frequency water pump. The water tank is used to store water. The variable frequency water pump transports water in the water tank to the inflow seal through a water supply pipe. The pressure regulating unit includes a pressure reducing valve, which is arranged on the water supply pipe between the variable frequency water pump and the inflow seal and is used to regulate the pressure of the water output by the variable frequency water pump; A pressure detection unit, comprising a pressure sensor, wherein the pressure sensor is provided at an inner flow seal or an end cover of the housing; The control unit is electrically connected to the pressure sensor, the variable frequency water pump and the pressure reducing valve, and is used to receive pressure data output by the pressure sensor and adjust the speed of the variable frequency water pump and the opening of the pressure reducing valve according to a preset pressure range.

2. The internal flow sealing and pressure maintaining system according to claim 1, characterized in that: The water tank is provided with a water filling port and a water level monitoring device. The water filling port is used to replenish the water source in the water tank. The water level monitoring device is used to monitor the water level in the water tank in real time and output the water level data to the control unit.

3. The internal flow sealing and pressure maintaining system according to claim 1, characterized in that: The pressure regulating unit also includes a pressure stabilizing tank, which is connected to the pipeline between the pressure reducing valve and the inflow seal and is used to stabilize the water flow. An air bag is provided in the pressure stabilizing tank, and the air bag expands or contracts as the water flow pressure changes.

4. The internal flow sealing and pressure maintaining system according to claim 3, characterized in that: The pressure regulating unit further comprises a safety valve, which is arranged on a pipeline between the pressure stabilizing tank and the inflow seal.

5. The internal flow sealing and pressure maintaining system according to claim 1, characterized in that: The control unit is also connected to a display device, which is used to display water supply pressure and water tank water level information in real time.

6. The internal flow sealing and pressure maintaining system according to claim 1, characterized in that: The water supply pipe is also provided with a flow sensor, which is electrically connected to the control unit and is used for real-time monitoring of the water supply flow.

7. The internal flow sealing and pressure maintaining system according to claim 1, characterized in that: It also includes an alarm device, which is electrically connected to the control unit.

8. The internal flow sealing and pressure maintaining system according to claim 1, characterized in that: The control unit includes a PLC controller, which is respectively connected to the pressure detection unit and the pressure regulation unit. A pressure threshold range is preset in the PLC controller. When the water supply pressure detected by the pressure detection unit exceeds the pressure threshold range, the PLC controller controls the pressure regulation unit to operate so that the water supply pressure remains within the pressure threshold range.

9. The internal flow sealing and pressure maintaining system according to claim 1, characterized in that: A pressure gauge is also provided on the pipeline between the variable frequency water pump and the pressure reducing valve for monitoring the pressure of the pressurized water coming out of the variable frequency water pump.

10. The internal flow sealing and pressure maintaining system according to claim 1, characterized in that: The pressure reducing valve is an electric pressure reducing valve, and the opening is adjusted by a control unit.

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