Special tool for detecting backpressure of sealing system of cutterhead type chopper

Abstract

The utility model relates to a special tool for detecting the back pressure of a sealing system of a cutterhead type chopper. A liquid inlet detection joint and a liquid outlet detection joint are arranged on the detection cavity, the liquid inlet detection joint is connected with a liquid outlet of the circulating pump through a pipeline, the liquid outlet detection joint is connected with a liquid inlet of the filter through a pipeline, the liquid outlet of the filter is connected with a liquid inlet of the cooler through a pipeline, and a liquid outlet of the cooler is connected with a liquid inlet of the circulating pump through a pipeline. The oil circulating system is arranged to be connected with the detection cavity of the chopper sealing assembly in a matched mode, after the detection cavity is filled with oil, the internal pressure of the detection cavity is monitored, when the back pressure exceeds the range, the flow or pressure of the buffer solution is automatically adjusted, the back pressure is stabilized at a set value, and therefore in the pressure stabilizing process, the pressure of the chopper sealing assembly is stabilized. The working environment of the sealing assembly of the chopper is simulated, the sealing performance of the sealing assembly of the chopper can be detected with low cost, and the reliable working performance of the cutterhead type chopper is ensured.

Description

Technical Field

[0001] This application relates to the field of mechanical seal back pressure testing tooling technology, and in particular to a special tooling for testing the back pressure of a disc shredder sealing system. Background Technology

[0002] The sealing system side of a disc shredder refers to the pressure exerted on the inner back pressure of the mechanical seal by the medium pressure. It has a significant impact on the stress state of the internal sealing surface of the mechanical seal, liquid film formation, stability, leakage, and environmental aspects.

[0003] The mechanical seal is designed with a double seal and costs 200,000 yuan per set. The sealing fluid is methyl silicone oil. Each replacement mechanical seal operates for about 3 months, resulting in a short service life and high spare parts costs. Disassembly revealed that the leaking mechanical seal had several annular wear marks on its friction pair. The height of the wear platform, made of hard alloy for both the dynamic and static rings, had been reduced by 0.5 mm. The flat crystal stripe inspection did not meet the operational requirements, leading to media leakage, serious environmental pollution, and unplanned shutdown losses amounting to millions of yuan. As a crucial parameter affecting sealing performance, accurate measurement and control of mechanical seal back pressure are of great significance for optimizing mechanical seal design and improving sealing reliability. Therefore, the invention of a dedicated back pressure testing fixture is of great guiding importance. Utility Model Content

[0004] To address or partially address the problems existing in related technologies, this application provides a special tooling for detecting the back pressure of the sealing system of a disc shredder. This tooling can simulate the working environment of the shredder's sealing components, detect the sealing performance of the shredder's sealing components at a relatively low cost, and ensure the reliable working performance of the disc shredder.

[0005] The first aspect of this application provides a special tooling for detecting the back pressure of the sealing system of a disc shredder, including a detection chamber, a filter, a cooler, a circulating pump, and a back pressure detection device; the detection chamber is open on one side, and screws are evenly distributed along the outer edge of the open side, the screws are used to dock with the shredder sealing assembly for testing, and are fastened by nuts;

[0006] The detection chamber is equipped with an inlet detection connector and an outlet detection connector. The inlet detection connector is connected to the outlet of the circulation pump through a pipe, and the outlet detection connector is connected to the inlet of the filter through a pipe. The outlet of the filter is connected to the inlet of the cooler through a pipe, and the outlet of the cooler is connected to the inlet of the circulation pump through a pipe.

[0007] The detector is also equipped with a back pressure detection device.

[0008] Optionally, the back pressure detection device includes a pressure sensor and a PLC. The pressure sensor is installed inside the detection chamber and connected to the PLC. After the detection chamber is filled with oil, the pressure sensor is squeezed. The pressure sensor and the PLC can monitor the internal pressure data.

[0009] The technical solution provided in this application may include the following beneficial effects:

[0010] The solution provided in this application can monitor the internal pressure of the shredder sealing assembly by setting up an oil circulation system in conjunction with the detection chamber connected to the shredder sealing assembly. After the detection chamber is filled with oil, the back pressure is monitored. When the back pressure exceeds the range, the buffer flow rate or pressure is automatically adjusted to stabilize the back pressure at the set value. Thus, during the pressure stabilization process, the working environment of the shredder sealing assembly is simulated, and the sealing performance of the shredder sealing assembly is detected at a relatively low cost, ensuring the reliable working performance of the disc shredder.

[0011] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0012] The above and other objects, features and advantages of this application will become more apparent from the more detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments thereof.

[0013] Figure 1 This is a schematic diagram of the overall device shown in the embodiments of this application;

[0014] Figure 2 This is a schematic diagram of another embodiment.

[0015] Reference numerals: 1-Detection chamber, 2-Filter, 3-Cooler, 4-Circulation pump, 5-Pressure sensor, 6-PLC, 7-Chopper sealing assembly, 8-Screw, 9-Fasting nut, 10-Air pump, 11-Pressure gauge. Detailed Implementation

[0016] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make this application more thorough and complete, and to fully convey the scope of this application to those skilled in the art.

[0017] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0018] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0019] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0020] The sealing system of a disc shredder is expensive, and wear occurs during operation. After the medium leaks, it causes serious environmental pollution and significant losses. As an important parameter affecting sealing performance, accurate measurement and control of mechanical seal back pressure is of great significance for optimizing mechanical seal design and improving sealing reliability.

[0021] To address the aforementioned issues, this application provides a dedicated tooling device for detecting the back pressure of the sealing system of a disc shredder. This device utilizes an oil circulation system connected to the detection chamber of the shredder's sealing assembly. After filling the detection chamber with oil, the internal pressure is monitored. When the back pressure exceeds the specified range, the buffer flow rate or pressure is automatically adjusted to stabilize the back pressure at a set value. This pressure stabilization process simulates the working environment of the shredder's sealing assembly, allowing for the detection of the sealing performance of the shredder's sealing assembly at a relatively low cost, thus ensuring the reliable operation of the disc shredder.

[0022] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0023] See Figure 1 This application provides a special tooling device for detecting the back pressure of the sealing system of a disc shredder, including a detection chamber 1, a filter 2, a cooler 3, a circulating pump 4, and a back pressure detection device;

[0024] In this embodiment, the detection chamber 1 is a cylindrical cavity structure with an opening on one side, and screws 8 parallel to the axial direction of the detection chamber 1 are evenly distributed along the outer edge of the opening side. The screws 8 are used to dock with the shredder sealing assembly 7 for testing. They are fastened by connecting with nuts. After the shredder sealing assembly 7 is assembled, its own bolt holes can match the screws 8 in this technical solution. After insertion, the shredder sealing assembly 7 seals the opening of the detection chamber 1.

[0025] In this embodiment, the detection chamber 1 is equipped with an inlet detection connector and an outlet detection connector (the outlet detection connector is equipped with a valve). The inlet detection connector is connected to the outlet of the circulation pump 4 via a pipe, and the outlet detection connector is connected to the inlet of the filter 2 via a pipe. The outlet of the filter 2 is connected to the inlet of the cooler 3 via a pipe, and the outlet of the cooler 3 is connected to the inlet of the circulation pump 4 via a pipe. The circulation pump 4 ensures a stable buffer solution flow rate, the filter 2 removes impurities, and the cooler 3 controls the buffer solution temperature. Oil is pumped in through the circulation pump 4. In this embodiment, a suitable buffer solution is selected; the original buffer solution used was heat transfer oil, whose specific gravity at 20°C is 0.8998*1000kg / m³. 3 The viscosity is 19.12 cst at 40℃ and the flash point is 192℃. After comparison and selection, methyl silicone oil solution was chosen as the buffer solution. It is resistant to high and low temperatures, has good thermal stability and flame retardancy, and has a flash point greater than 300℃, which can ensure good compatibility between the buffer solution and the medium and prevent chemical reactions.

[0026] In this embodiment, a back pressure detection device is also installed on the detector. The back pressure detection device includes a pressure sensor 5 and a PLC 6. The pressure sensor 5 is installed in the detection chamber 1 and connected to the PLC 6. After the detection chamber 1 is filled with oil, the pressure sensor 5 is squeezed. The pressure sensor 5 and the PLC 6 can monitor the internal pressure data. After the oil is pumped in, the oil enters the detection chamber 1. After being squeezed, the pressure sensor 5 transmits an electrical signal to the PLC 6. The system has a preset back pressure range. When the back pressure exceeds the range, the buffer flow rate or pressure is automatically adjusted to stabilize the back pressure at the set value. After the detection is completed, the valve on the liquid outlet detection connector is opened. The oil flows back and is first filtered, then flows back to the circulation pump 4 after passing through the cooler 3, forming a system where the oil can circulate. The internal pressure can change, thereby detecting the sealing performance of the shredder sealing assembly 7.

[0027] In other embodiments, such as Figure 2As shown, an air source connector can be installed on the detection chamber 1. The detection chamber 1 is connected to the air pump 10 through a pipe. A pressure gauge 11 is installed to connect to the internal cavity of the detection chamber 1. During operation, the detection chamber 1 and the connected chopper sealing assembly 7 are placed in water. After the air source is injected, the pressure gauge 11 monitors the internal pressure. After the pressure is stabilized, it is observed whether bubbles appear in the water, thereby testing the sealing performance of the chopper sealing assembly 7. Experiments can be conducted at different pressure values, and the experimental cost is low.

[0028] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A special tool for detecting back pressure in a knife disc shredder seal system, characterized by: Including detection cavity, filter, cooler, circulating pump, back pressure detection device; The opening side of the detection cavity is uniformly distributed with a screw rod outside the opening side, the screw rod is used for docking with the sealing assembly of the chopper for testing, and the screw rod is fastened through a nut; Liquid inlet detection connector and liquid outlet detection connector are arranged on the detection cavity, the liquid inlet detection connector is connected with the liquid outlet of the circulating pump through a pipeline, the liquid outlet detection connector is connected with the liquid inlet of the filter through a pipeline, the liquid outlet of the filter is connected with the liquid inlet of the cooler through a pipeline, and the liquid outlet of the cooler is connected with the liquid inlet of the circulating pump through a pipeline; The back pressure detection device is further installed on the detection.

2. The tool for detecting back pressure in a cutterhead-type shredder seal system of claim 1, wherein: The back pressure detection device comprises a pressure sensor and a PLC, the pressure sensor is installed in the detection cavity, the pressure sensor is connected with the PLC, the pressure sensor is extruded after the detection cavity is filled with oil, and the pressure sensor and the PLC can monitor the internal pressure data.

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