A kind of three-cylinder single-acting high-temperature-resistant corrosion-resistant diaphragm pump isolator device

Abstract

The utility model provides a kind of three-cylinder single-action high-temperature-resistant corrosion-resistant diaphragm pump isolator device belongs to three-cylinder single-action high-temperature-resistant corrosion-resistant diaphragm pump technical field.The utility model provides a kind of isolator device of three-cylinder single-action high-temperature-resistant corrosion-resistant diaphragm pump applied to coal tar conveying field, can effectively isolate high-temperature coal tar and diaphragm under the premise of not changing diaphragm pump basic working principle, reduce the adverse effect of high temperature to diaphragm, ensure that diaphragm is stably operated in safe temperature range, to improve the operation reliability and service life of diaphragm pump.The utility model includes shell, and its characterized in that: guide rod is arranged in shell, floating piston is arranged on guide rod, and outer surface of floating piston cooperates with inner surface of shell;One end of guide rod is connected with fixed frame on shell, and the other end of guide rod is connected with a positioning connection assembly for connecting diaphragm pump inlet and outlet valve box and extending out of shell.

Description

Technical Field

[0001] This utility model belongs to the technical field of three-cylinder single-acting high-temperature and corrosion-resistant diaphragm pumps, specifically relating to an isolator device for the hydraulic end system of a three-cylinder single-acting high-temperature and corrosion-resistant diaphragm pump used in the field of coal tar transportation. Background Technology

[0002] Coal tar is a typical high-temperature, high-viscosity medium, characterized by poor fluidity, easy condensation, and insufficient lubrication. It typically requires continuous pipeline transport under high-temperature conditions. In industrial settings such as coal chemical and coking, diaphragm pumps are widely used for coal tar transportation due to their superior sealing performance and suitability for transporting high-viscosity media.

[0003] Diaphragm pumps rely on the reciprocating motion of a diaphragm to create the suction and discharge processes during operation, with the conveyed medium in direct contact with the diaphragm. In existing diaphragm pumps, the diaphragm is typically made of rubber or rubber composite materials, which has limitations in its high-temperature resistance; under normal operating conditions, the applicable medium temperature generally does not exceed 125℃. When used for conveying high-temperature coal tar, the high-temperature medium will generate continuous thermal shock to the diaphragm through direct contact or heat conduction, easily leading to accelerated diaphragm aging, decreased elasticity, or even failure, thus significantly shortening the diaphragm's service life and affecting the stable operation of the diaphragm pump.

[0004] To address the issue of transporting high-temperature media, existing technologies typically incorporate heat insulation or cooling structures between the diaphragm pump's inlet / outlet channels and the diaphragm chamber to reduce the temperature of the medium entering the diaphragm chamber. However, because diaphragm pumps operate in a reciprocating manner, the medium continuously flows back and forth during suction and discharge. Simply using a fixed insulation layer or static isolation structure is insufficient to ensure continuous and effective heat insulation while maintaining normal media transport, easily leading to insulation failure or obstruction of media flow.

[0005] Furthermore, during the transportation of high-temperature coal tar, if the medium experiences insufficient flow disturbance or its temperature drops too rapidly within the transportation channel, localized condensation can easily occur, further increasing the transportation resistance and even leading to the risk of blockage. Therefore, in the hydraulic end system of a high-temperature diaphragm pump, it is not only necessary to effectively isolate the high-temperature medium from the diaphragm, but also to control the heat transfer rate between the high-temperature and low-temperature zones while ensuring continuous flow of the medium.

[0006] Against this backdrop, how to achieve reliable isolation between the high-temperature coal tar medium and the diaphragm without changing the basic working principle of the diaphragm pump, and how to reduce the adverse effects of high temperature on the diaphragm through reasonable structural design, has become a technical problem that high-temperature diaphragm pumps urgently need to solve in the field of coal tar transportation. Utility Model Content

[0007] This invention provides an isolator device for a three-cylinder single-acting high-temperature and corrosion-resistant diaphragm pump used in the field of coal tar transportation. Without changing the basic working principle of the diaphragm pump, it can effectively isolate high-temperature coal tar from the diaphragm, reduce the adverse effects of high temperature on the diaphragm, and ensure that the diaphragm operates stably within a safe temperature range, thereby improving the operational reliability and service life of the diaphragm pump.

[0008] The present invention adopts the following technical solution: the present invention includes a housing, characterized in that: a guide rod is provided inside the housing, a floating piston is provided on the guide rod, the outer surface of the floating piston is in cooperation with the inner surface of the housing; one end of the guide rod is connected to a fixed frame on the housing, and the other end of the guide rod extends out of the housing and is connected to a positioning connection assembly for connecting the inlet and outlet valve box of the diaphragm pump.

[0009] As a preferred embodiment of this utility model, the floating piston includes a set of blades arranged in a row, the outer surface of the blade set cooperating with the inner surface of the housing; pressure caps are provided at both ends of the blade set, and the blades are connected as a whole by the pressure caps at both ends and bolts connecting the two pressure caps; a central channel is provided in the blade set and the pressure caps, and the central channel cooperates with the guide rod.

[0010] Furthermore, a wear-resistant bushing is provided in the central channel, and two wear-resistant bushings are provided, with a first buffer spring between the two wear-resistant bushings; the two ends of the two wear-resistant bushings are in contact with and limited by the end faces of the two pressure caps.

[0011] Furthermore, both pressure cap surfaces are provided with cushioning pads.

[0012] As another preferred embodiment of this utility model, the fixing frame includes a mounting base disposed at the end of the housing, a connecting body disposed inside the mounting base, one end of the connecting body being configured as a threaded joint, the threaded joint extending into the housing and connected to a collar, the guide rod being provided with a groove that mates with the collar; the other end of the connecting body is fixed inside the mounting base by a buckle cover.

[0013] Furthermore, the mounting base is provided with a valve that communicates with the inside of the housing.

[0014] Furthermore, the positioning connection assembly includes a sleeve connected to the guide rod, a central positioning connector with a central positioning hole at the end of the sleeve, a side bracket connected to the sleeve via corresponding connection hole groups and connectors on the side of the central positioning connector, and a positioning connection plate on the side bracket.

[0015] Furthermore, the buffer device includes a second buffer spring disposed between the sleeve and the floating piston, and a third buffer spring disposed between the collar and the other end of the piston.

[0016] As a fourth preferred embodiment of the present invention, one end of the housing with the fixing frame is further provided with a connecting flange for connecting to the cooling device.

[0017] As a fifth preferred embodiment of this utility model, a gap is provided between the floating piston and the inner surface of the housing.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects: 1. Achieving dynamic isolation between high-temperature medium and diaphragm: By setting a guide rod in the shell and a floating piston that can reciprocate with the medium on the guide rod, the high-temperature coal tar is always isolated outside the diaphragm chamber during the transportation process, thus structurally preventing the high-temperature medium from directly contacting the diaphragm and effectively reducing the adverse effects of high temperature on the diaphragm.

[0019] 2. The isolation function is completed without affecting the normal operation of the diaphragm pump: The outer surface of the floating piston matches the inner surface of the housing and can move freely back and forth along the guide rod, so that the isolation device can act synchronously with the material suction and discharge process without changing the original suction and discharge mechanism of the diaphragm pump, ensuring the continuous and stable conveying process.

[0020] 3. Improve the stability and reliability of the floating piston movement: The floating piston is axially guided by the guide rod, which limits its radial offset and avoids uneven wear or jamming of the floating piston during reciprocating motion, thereby improving the overall operational stability of the isolator device.

[0021] 4. Effectively mitigates impact loads generated by reciprocating motion: By setting a first buffer spring inside the floating piston, and setting a second and third buffer spring at both ends of the piston and related positions, and setting a buffer pad on the pressure plate surface, the impact force on the floating piston at the end of the stroke is buffered in multiple stages, effectively reducing structural impact and lowering the risk of damage to components.

[0022] 5. Reduce wear on guide parts and extend service life: A wear-resistant bushing is installed in the central channel of the floating piston to form a wear-resistant fit structure between the floating piston and the guide rod, reducing friction and wear under high temperature and high viscosity media conditions, and extending the service life of the guide rod and piston assembly.

[0023] 6. Facilitates the installation, disassembly, and maintenance of the isolator device: Through the cooperation of the fixing frame, collar, slot, and positioning connection components, reliable positioning and connection of the guide rod and isolator device are achieved. The structure is clear, and disassembly and assembly are convenient, which is conducive to the inspection, replacement, and maintenance of the isolator device.

[0024] 7. Facilitates heat control under high-temperature conditions: A connecting flange for connecting to the cooling device is provided at one end of the housing with the fixed frame, so that the isolator device can be used in conjunction with the cooling device to dissipate the heat transferred to the low-temperature zone, further ensuring that the diaphragm operates within a safe temperature range; a gap is provided between the floating piston and the inner surface of the housing, so that a small amount of high-temperature medium can enter the low-temperature zone, thereby keeping the temperature of the diaphragm area stable and maintaining the diaphragm operating at a safe temperature.

[0025] In summary, this utility model, through the coordinated operation of a floating piston, a guiding structure, and a multi-stage buffer structure, achieves reliable isolation and stable operation under high-temperature coal tar transportation conditions, effectively improving the safety, reliability, and service life of the diaphragm pump. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of this utility model.

[0027] Figure 2 This is a schematic diagram of a floating piston.

[0028] Figure 3 This is a diagram showing the usage state of this utility model.

[0029] In the attached diagram, 1 is the center positioning joint, 2 is the side support, 3 is the connecting hole group, 4 is the center positioning hole, 5 is the sleeve, 6 is the second buffer spring, 7 is the housing, 8 is the floating piston, 9 is the third buffer spring, 10 is the cover, 11 is the connecting body, 12 is the connecting flange, 13 is the threaded joint, 14 is the collar, 15 is the valve, 16 is the guide rod, 17 is the buffer pad, 18 is the pressure cap, 19 is the blade group, 20 is the groove, 21 is the first buffer spring, 22 is the bolt, 23 is the wear-resistant bushing, 24 is the inlet / outlet valve box, and 25 is the cooling device. Detailed Implementation

[0030] This utility model adopts the following technical solution: It includes a housing 7, within which a guide rod 16 is disposed. A floating piston 8 is mounted on the guide rod 16, with its outer surface mating to the inner surface of the housing 7. One end of the guide rod 16 is connected to a fixed frame on the housing 7, and the other end extends out of the housing 7 and is connected to a positioning connection assembly for connecting the inlet / outlet valve box 24 of the diaphragm pump. Guided by the guide rod 16, the floating piston 8 reciprocates axially within the housing 7 during the diaphragm pump's suction and discharge processes. The axial guidance of the floating piston 8 by the guide rod 16 ensures a stable movement trajectory within the housing 7, and its positional changes form a movable isolation layer between the high-temperature medium and the diaphragm. Without altering the working principle of the diaphragm pump, dynamic isolation between the high-temperature medium and the diaphragm is achieved, preventing direct contact between the high-temperature medium and the diaphragm, thus improving the safety and reliability of the diaphragm operation.

[0031] The floating piston 8 includes a set of blades 19 arranged in a row, the outer surface of which mates with the inner surface of the housing 7. Each blade set 19 has a pressure cap 18 at both ends, and the blades are connected as a whole by the pressure caps 18 and bolts 22 connecting the two pressure caps 18. A central channel is provided within the blade set 19 and the pressure caps 18, and the central channel mates with the guide rod 16. The entire blade set 19 reciprocates synchronously with the guide rod 16, forming a continuous isolation structure within the housing 7. The combination of multiple blade sets 19 to form an integral piston structure increases the isolation area and ensures uniform force distribution. Simultaneously, the central channel mates with the guide rod 16, ensuring the coaxiality of the floating piston 8 during movement. This improves the structural stability of the floating piston 8 while maintaining the isolation effect, avoiding deformation or failure caused by concentrated stress on a single structure.

[0032] A groove 20 is provided on the mating surface between the blade and the inner surface of the housing 7.

[0033] Two wear-resistant bushings 23 are installed within the central channel, with a first buffer spring 21 positioned between them. The two ends of the two wear-resistant bushings 23 contact and limit the movement of the two pressure caps 18. When the floating piston 8 reciprocates on the guide rod 16, the wear-resistant bushings 23 and the guide rod 16 form a sliding fit, and the buffer spring is compressed or rebounded at the piston's moving end. The wear-resistant bushings 23 provide guidance and frictional contact, while the buffer spring absorbs and releases axial impact loads. This reduces wear between the guide rod 16 and the floating piston 8, mitigates the impact force generated by the reciprocating motion, and extends the service life of critical components.

[0034] Both pressure caps 18 have buffer pads 17 on their surfaces. When the floating piston 8 moves to the end of its stroke, the buffer pads 17 come into contact with the opposing structure and undergo elastic deformation. The flexible buffer material absorbs the instantaneous impact energy, preventing rigid collisions. This further reduces the impact load on the floating piston 8 at the end of its stroke, preventing structural damage and improving operational stability.

[0035] The mounting bracket includes a mounting seat located at the end of the housing 7. A connector 11 is disposed within the mounting seat. One end of the connector 11 is a threaded joint 13, which extends into the housing 7 and connects to a collar 14. The guide rod 16 has a groove that mates with the collar 14. The other end of the connector 11 is fixed to the mounting seat by a cover 10. The guide rod 16 is axially limited by the groove and the collar 14, and the connector 11 fixes the guide rod 16 to the end of the housing 7. This combination of mechanical limiting and connection fixation ensures that the guide rod 16 maintains its axial position during operation. This guarantees the stability of the guiding structure and prevents the guide rod 16 from shifting with the floating piston 8, thereby ensuring the long-term stable operation of the isolator.

[0036] The mounting base is equipped with a valve 15 that communicates with the interior of the housing 7. The valve 15 allows for the regulation of the medium or pressure state inside the housing 7. The valve 15 provides a controllable connection or release channel within the housing 7, facilitating the commissioning, maintenance, and handling of abnormal operating conditions of the isolator device, thus improving ease of use and safety.

[0037] The positioning connection assembly includes a sleeve 5 connected to the guide rod 16. A central positioning connector 1 with a central positioning hole 4 is provided at the end of the sleeve 5. A side bracket 2, connected to the sleeve 5 via corresponding connection hole groups 3 and connectors, is provided on the side of the central positioning connector 1. A positioning connection plate is provided on the side bracket 2. The isolator device achieves precise docking with the diaphragm pump inlet / outlet valve box 24 through the positioning connection assembly. The combination of central positioning and lateral connection ensures accurate connection position and uniform force distribution. This improves the installation accuracy and connection stability between the isolator and the diaphragm pump, avoiding the effects of misalignment or vibration.

[0038] The buffer device includes a second buffer spring 6 disposed between the sleeve 5 and the floating piston 8, and a third buffer spring 9 disposed between the collar 14 and the other end of the piston. During the reciprocating motion of the floating piston 8, the springs participate in buffering at different positions. Through the multi-position elastic buffer structure, the impact generated at different stages of motion is absorbed in stages. This significantly reduces the impact load generated by the reciprocating motion and improves the overall operational stability of the isolator.

[0039] The housing 7 is provided with a connecting flange 12 for connecting to the cooling device 25 at one end of the fixing frame.

[0040] A gap is provided between the floating piston 8 and the inner surface of the housing 7. A small amount of high-temperature medium enters the low-temperature zone through the gap. Controlled leakage achieves slow heat release and temperature equalization, keeping the temperature in the diaphragm region stable, preventing sudden temperature changes, and ensuring the diaphragm operates at a safe temperature for extended periods.

[0041] It is understood that the above specific description of this utility model is only used to illustrate this utility model and is not limited to the technical solutions described in the embodiments of this utility model. Those skilled in the art should understand that modifications or equivalent substitutions can still be made to this utility model to achieve the same technical effect; as long as the use needs are met, they are all within the protection scope of this utility model.

Claims

1. A three-cylinder single-acting high-temperature and corrosion-resistant diaphragm pump isolator device, comprising a housing (7), characterized in that: A guide rod (16) is provided inside the housing (7), and a floating piston (8) is provided on the guide rod (16). The outer surface of the floating piston (8) is in contact with the inner surface of the housing (7). One end of the guide rod (16) is connected to the fixed frame on the housing (7), and the other end of the guide rod (16) extends out of the housing (7) and is connected to a positioning connection assembly for connecting the diaphragm pump inlet and outlet valve box (24).

2. The isolator device for a three-cylinder single-acting high-temperature and corrosion-resistant diaphragm pump according to claim 1, characterized in that: The floating piston (8) includes a set of blades (19) arranged in a row. The outer surface of the blade set (19) is in contact with the inner surface of the housing (7). The blade set (19) has a pressure cap (18) at both ends. The blades are connected as one unit by the pressure caps (18) at both ends and the bolts (22) connecting the two pressure caps (18). The blade set (19) and the pressure caps (18) have a central channel in their interiors. The central channel is in contact with the guide rod (16).

3. The isolator device for a three-cylinder single-acting high-temperature and corrosion-resistant diaphragm pump according to claim 2, characterized in that: A wear-resistant bushing (23) is provided in the central channel. Two wear-resistant bushings (23) are provided, and a first buffer spring (21) is provided between the two wear-resistant bushings (23). The two ends of the two wear-resistant bushings (23) are in contact with the end faces of the two pressure caps (18) for limiting.

4. The isolator device for a three-cylinder single-acting high-temperature and corrosion-resistant diaphragm pump according to claim 2, characterized in that: Both pressure caps (18) have cushioning pads (17) on their surfaces.

5. The isolator device for a three-cylinder single-acting high-temperature and corrosion-resistant diaphragm pump according to claim 1, characterized in that: The fixing frame includes a mounting base disposed at the end of the housing (7), and a connector (11) is disposed inside the mounting base. One end of the connector (11) is configured as a threaded joint (13), which extends into the housing (7) and is connected to a collar (14). The guide rod (16) is provided with a groove that mates with the collar (14). The other end of the connector (11) is fixed inside the mounting base by a buckle (10).

6. The isolator device for a three-cylinder single-acting high-temperature and corrosion-resistant diaphragm pump according to claim 5, characterized in that: The mounting base is equipped with a valve (15) that communicates with the inside of the housing (7).

7. The isolator device for a three-cylinder single-acting high-temperature and corrosion-resistant diaphragm pump according to claim 5, characterized in that: The positioning connection assembly includes a sleeve (5) connected to the guide rod (16), a central positioning connector (1) with a central positioning hole (4) is provided at the end of the sleeve (5), and a side bracket (2) is provided on the side of the central positioning connector (1) and connected to the sleeve (5) through corresponding connection hole groups (3) and connectors. A positioning connection plate is provided on the side bracket (2).

8. The isolator device for a three-cylinder single-acting high-temperature and corrosion-resistant diaphragm pump according to claim 5, characterized in that: The buffer device includes a second buffer spring (6) disposed between the sleeve (5) and the floating piston (8), and a third buffer spring (9) disposed between the collar (14) and the other end of the piston.

9. The isolator device for a three-cylinder single-acting high-temperature and corrosion-resistant diaphragm pump according to claim 1, characterized in that: The housing (7) is provided with a connecting flange (12) at one end of the fixing frame for connecting to the cooling device (25).

10. The isolator device for a three-cylinder single-acting high-temperature and corrosion-resistant diaphragm pump according to claim 1, characterized in that: A gap is provided between the floating piston (8) and the inner surface of the housing (7).

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