Compressor packing box nitrogen seal control system

Abstract

The utility model discloses a compressor packing box nitrogen seal control system which is characterized by comprising a packing box, a control box and a nitrogen supply device, and the nitrogen supply device is connected with the packing box through a gas pipe. The nitrogen supply device comprises a nitrogen cylinder, a flow regulating valve, a safety valve, a pressure reducing valve and a pressure sensor, the flow regulating valve is installed on a gas pipe connected with the filler box, the safety valve is connected with the filler box, the nitrogen cylinder is connected with the pressure reducing valve, the pressure sensor is installed on the filler box, and the pressure sensor is connected with the pressure reducing valve. And the nitrogen supply device is connected with the pressure sensor and the control box.

Description

Technical Field

[0001] The utility model relates to the technical field of nitrogen sealing, in particular to a nitrogen sealing control system for a compressor stuffing box. Background Art

[0002] The operating principle of a piston compressor is that the crankshaft drives the connecting rod, which in turn drives the piston rod. The piston rod, passing through the cylinder, drives the piston in reciprocating motion, completing the intake, compression, and exhaust cycles. During long-term operation, the reciprocating motion of the piston rod rubs against the packing, generating heat and accelerating packing wear, rendering it ineffective as a seal. This, in turn, causes the compressed medium to contaminate the compressor lubricant. Furthermore, compressed gas leakage poses a safety hazard, compromising stable compressor operation and continuous system production. Conventional stuffing box seals utilize a packing made of multiple layers of flexible material (such as graphite or polytetrafluoroethylene (PTFE)) surrounding the piston rod and installed within the stuffing box. A packing gland secures the packing in place, achieving a seal through close contact between the packing and the piston rod. The packing gradually wears as the piston rod reciprocates, necessitating regular replacement. Over time, the packing may lose its elasticity, leading to increased leakage. The high friction between the packing and the piston rod can cause wear on the piston rod surface, reducing the compressor's stuffing box sealing performance and service life.

[0003] Therefore, it is necessary to provide a compressor stuffing box nitrogen sealing control system to solve the above technical problems. Utility Model Content

[0004] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the title of the invention of this application to avoid blurring the purpose of this section, the abstract of the specification and the title of the invention, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a compressor stuffing box nitrogen sealing control system, characterized in that: it includes a stuffing box, a control box and a nitrogen supply device, and the nitrogen supply device is connected to the stuffing box through an air pipe;

[0006] The nitrogen supply device includes a nitrogen cylinder, a flow regulating valve, a safety valve, a pressure reducing valve and a pressure sensor. The flow regulating valve is installed on the air pipe connected to the stuffing box, the safety valve is connected to the stuffing box, the nitrogen cylinder is connected to the pressure reducing valve, the pressure sensor is arranged and installed in the stuffing box, and the nitrogen supply device is connected to the stuffing box and the control box.

[0007] As a preferred solution of the compressor stuffing box nitrogen sealing control system of the present invention, a sealing ring is provided at the connection between the air pipe and the stuffing box.

[0008] As a preferred solution of the compressor stuffing box nitrogen sealing control system of the present invention, a filter valve is installed on the nitrogen cylinder.

[0009] As a preferred solution of the compressor stuffing box nitrogen sealing control system of the present invention, the control box includes a controller and a solenoid valve, and the controller is electrically connected to the solenoid valve.

[0010] As a preferred solution of the compressor stuffing box nitrogen sealing control system of the present invention, the controller is electrically connected to the safety valve and the pressure sensor.

[0011] As a preferred solution of the compressor stuffing box nitrogen sealing control system of the present invention, the stuffing gland is fixedly connected to the stuffing box by bolts.

[0012] As a preferred solution of the compressor stuffing box nitrogen sealing control system of the present invention, the set pressure of the safety valve is 1.1 times the working pressure of the stuffing box.

[0013] As a preferred solution of the compressor stuffing box nitrogen sealing control system of the utility model, a sealing gasket is provided between the stuffing box and the cylinder body and is fixedly connected.

[0014] As a preferred solution of the compressor stuffing box nitrogen sealing control system of the present invention, the stuffing box is provided with an exhaust pipe, and a one-way valve is installed on the exhaust pipe.

[0015] The beneficial effects of this utility model are as follows: nitrogen is injected into the stuffing box through the nitrogen supply device to seal it, which does not react with the compressed gas, effectively isolates the compressed gas, improves the sealing effect, prevents external contaminants from entering the stuffing box, and extends the service life of the stuffing. Through the cooperation between the control box and the nitrogen supply device, the amount of nitrogen in the stuffing box can be effectively controlled, and the nitrogen supply of the nitrogen supply device can also be controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without inventive work. Among them:

[0017] Figure 1A schematic diagram of the connection structure of a compressor stuffing box nitrogen sealing control system according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the controller connection structure of a compressor stuffing box nitrogen sealing control system according to an embodiment of the present invention.

[0019] Reference numerals: 100, stuffing box; 200, nitrogen supply device; 300, control box; 208, air pipe; 201, nitrogen cylinder; 202, flow regulating valve; 203, safety valve; 204, pressure reducing valve; 205, filter valve; 207, pressure sensor; 206, solenoid valve; 301, controller; DETAILED DESCRIPTION

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0021] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] Next, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, cross-sectional views of device structures may be partially enlarged and not to scale when describing embodiments of the present invention. Furthermore, the schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, three-dimensional dimensions, including length, width, and depth, should be included.

[0023] Furthermore, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0024] Example 1

[0025] Reference Figure 1-2 The first embodiment of the present invention is a compressor stuffing box nitrogen sealing control system, characterized in that it includes a stuffing box 100, a control box 300 and a nitrogen supply device 200, wherein the nitrogen supply device 200 is connected to the stuffing box 100 through an air pipe 208;

[0026] The nitrogen supply device 200 includes a nitrogen cylinder 201, a flow regulating valve 202, a safety valve 203, a pressure reducing valve 204 and a pressure sensor 207. The flow regulating valve 202 is installed on an air pipe 208 connected to the stuffing box 100, the safety valve 203 is connected to the stuffing box 100, the nitrogen cylinder 201 is connected to the pressure reducing valve 204, the pressure sensor 207 is arranged and installed in the stuffing box 100, and the nitrogen supply device 200 is connected to the pressure sensor 207 and the control box 300.

[0027] Specifically, the packing is the core component of the stuffing box 100 and is typically made of multiple layers of flexible materials (such as graphite, polytetrafluoroethylene (PTFE), etc.). These materials offer excellent sealing and wear resistance, allowing them to fit tightly against the piston rod 102 and prevent gas leakage. The packing gland is part of the stuffing box and is used to secure the packing, ensuring close contact with the piston rod 102 during reciprocating motion. The packing gland is typically made of metal and bolted to the stuffing box 100. The stuffing box is the main component of the stuffing box 100, typically made of metal, and is used to house the packing and the packing gland. The stuffing box is connected to the cylinder body to form a sealed chamber. To reduce friction between the packing and the piston rod 102, the stuffing box 100 is typically equipped with a lubrication system that injects lubricating oil or grease to reduce friction and wear. The main function of the stuffing box 100 is to seal the gap between the piston rod 102 and the cylinder body 101, preventing compressed gas leakage and ensuring the efficiency and safety of the compressor. The lubrication system in the stuffing box 100 can reduce the friction between the stuffing and the piston rod 102, reduce wear, and extend the service life of the stuffing. An air inlet pipe is installed on the stuffing box 100 and connected to the nitrogen supply device 200. In order to better control the nitrogen pressure in the stuffing box 100, a pressure sensor 207 is provided in the stuffing box for real-time monitoring of the pressure in the stuffing box 100 to ensure that the pressure is within a set range. The pressure sensor 207 is connected to the PLC controller to achieve precise control of the pressure in the stuffing box 100. Nitrogen is transported to the stuffing box 100 through a pipeline. Nitrogen forms a certain pressure in the stuffing box 100, which is usually slightly higher than the pressure inside the compressor to prevent compressed gas from leaking from the gap between the piston rod 102 and the stuffing box 100. A pressure reducing valve 204 is installed at the outlet of the nitrogen cylinder 201 to regulate the pressure of the nitrogen and ensure that the nitrogen reaches a suitable pressure before entering the stuffing box 100. To ensure the purity of the nitrogen, a filter valve 205 is installed on the pipeline where nitrogen enters the stuffing box 100 to filter impurities from the nitrogen. A one-way valve 210 is installed on the connecting pipe between the stuffing box and the nitrogen supply device. This prevents gas or other media within the stuffing box 100 from flowing back into the nitrogen supply device 200, thereby contaminating the nitrogen source. If the nitrogen supply device 200 malfunctions or experiences a pressure drop, the one-way valve 210 prevents gas within the stuffing box 100 from leaking into the environment. To accurately regulate the flow of nitrogen, a flow control valve 202 is also installed on the pipeline between the nitrogen and the stuffing box 100 to adjust the flow of nitrogen. For more precise flow control, the flow control valve 202 is an electric regulating valve, ensuring stable pressure within the stuffing box 100. In order to ensure the safety of the stuffing box 100, a safety valve 203 is installed on the stuffing box 100. The safety valve 203 can be a spring-loaded safety valve, a bursting disc, etc. The set pressure of the safety valve 203 is 1.2 times the working pressure of the stuffing box 100. It can be used to release pressure when the pressure in the stuffing box 100 exceeds the set value.When the pressure inside stuffing box 100 exceeds a set value, safety valve 203 automatically opens, releasing excess pressure and ensuring system safety. PLC controller 301 is connected to pressure sensor 207 and nitrogen supply device 200. It controls the on / off and flow rate of nitrogen supply device 200 based on the detection results of pressure sensor 207. To facilitate movement of nitrogen cylinder 201, it is placed in nitrogen cylinder holder 211.

[0028] Example 2

[0029] The control box 300 includes a controller 301, a solenoid valve 206, and a data acquisition module 302. The controller 301 uses a PLC controller of the S7-1200 series, the data acquisition module 302 uses a data acquisition module of the S7-1200 series, and the solenoid valve 206 uses a solenoid valve of the Siemens 627 series. The controller 301 is electrically connected to the solenoid valve 206 and the data acquisition module 302. The controller 301 is connected to the pressure sensor 207 and the nitrogen supply device 200. The solenoid valve 206 is installed at the gas outlet of the nitrogen cylinder 201 in the nitrogen supply device 200. The solenoid valve 206 is controlled by the controller 301 to adjust the opening or closing of the nitrogen cylinder 201.

[0030] The detection data of the pressure sensor 207 is collected by the data acquisition module 302 and compared with the preset pressure range; the controller 301 controls the operation of the nitrogen supply device 200 and the flow control valve 202 based on the comparison result. When the actual pressure in the stuffing box 100 is lower than the preset minimum value, the controller 301 controls the nitrogen supply device 200 to open and adjusts the opening of the flow control valve 202 to allow nitrogen to flow into the stuffing box 100 until the pressure returns to the preset range. When the actual pressure in the stuffing box 100 is higher than the preset maximum value, the controller 301 controls the nitrogen supply device 200 to close by controlling the solenoid valve 206 and adjusts the opening of the flow control valve 202 to reduce the amount of nitrogen flowing in until the pressure returns to the preset range. When the pressure in the stuffing box 100 exceeds the set pressure of the safety valve 203, the safety valve 203 automatically opens to release excess pressure and ensure system safety.

[0031] In summary, through the cooperation of the nitrogen supply device 200, the pressure sensor 207 and the controller 301, the working efficiency of the nitrogen sealing control is greatly improved, the safety of the corresponding personnel is improved, the sealing performance of the stuffing box 100 is improved and the service life of the stuffing is extended.

[0032] It is important to note that the configuration and arrangement of the present application, as shown in various exemplary embodiments, are illustrative only. Although only a few embodiments are described in detail in this disclosure, those reading this disclosure will readily appreciate that numerous modifications are possible (e.g., variations in the size, dimensions, structure, shape, and proportions of various components, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without materially departing from the novel teachings and advantages of the subject matter described herein. For example, components shown as integrally formed may be constructed from multiple parts or components, the positions of components may be inverted or otherwise altered, and the nature, number, or position of discrete components may be modified or changed. Therefore, all such modifications are intended to be encompassed within the scope of this invention. The order or sequence of any process or method steps may be altered or reordered according to alternative embodiments. In the claims, any "means-plus-function" clause is intended to cover structures described herein that perform the function described, and not only structural equivalence but also equivalent structures. Without departing from the scope of the present invention, other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0033] Additionally, in order to provide a concise description of example embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0034] It will be appreciated that in the development of any actual embodiment, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will, for those of ordinary skill having the benefit of this disclosure, be a routine undertaking of design, fabrication, and production without undue experimentation.

[0035] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, and all of these should be included in the scope of the claims of the present invention.

Claims

1. A compressor stuffing box nitrogen sealing control system, characterized in that : comprising a stuffing box (100), a control box (300) and a nitrogen supply device (200), wherein the nitrogen supply device (200) is connected to the stuffing box (100) via an air pipe (208); The nitrogen supply device (200) comprises a nitrogen cylinder (201), a flow regulating valve (202), a safety valve (203), a pressure reducing valve (204) and a pressure sensor (207); the flow regulating valve (202) is mounted on a gas pipe connected to a stuffing box (100); the safety valve (203) is connected to the stuffing box (100); the nitrogen cylinder (201) is connected to the pressure reducing valve (204); the pressure sensor (207) is mounted on the stuffing box (100); and the nitrogen supply device (200) is connected to the pressure sensor (207) and a control box (300).

2. The compressor stuffing box nitrogen sealing control system according to claim 1, characterized in that A sealing ring (209) is provided at the connection between the air pipe (208) and the stuffing box (100).

3. The compressor stuffing box nitrogen sealing control system according to claim 2, characterized in that : A filter valve (205) is installed on the nitrogen bottle (201).

4. The compressor stuffing box nitrogen sealing control system according to claim 1, characterized in that The control box (300) includes a controller (301) and a solenoid valve (206), and the controller is electrically connected to the solenoid valve (206).

5. The compressor stuffing box nitrogen sealing control system according to claim 4, characterized in that : The controller is electrically connected to the pressure sensor (207).

6. The compressor stuffing box nitrogen sealing control system according to claim 2, characterized in that The stuffing box (100) is fixedly connected to the cylinder body (101).

7. The compressor stuffing box nitrogen sealing control system according to claim 1, characterized in that : The set pressure of the safety valve (203) is 1.2 times the working pressure of the stuffing box (100).

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