Oil drain valve for degreaser based on buoyancy adjustment

Abstract

The utility model relates to an oil drain valve for an oil remover based on buoyancy adjustment, which belongs to the technical field of oil-water separation and comprises a mounting valve body, a valve core mounted in the mounting valve body, a sealing valve cover arranged at the upper end of the mounting valve body, a positioning mounting frame mounted in the sealing valve cover, and a guide rod chock plug clamped in the positioning mounting frame. The outer side of the guide rod chock plug is sleeved with a return spring, the lower end of the guide rod chock plug is provided with a spherical sealing body, the lower side of the spherical sealing body is provided with a main buoy, and high-precision recognition and self-adaptive control of an oil-water interface are achieved through the synergistic effect of the main buoy and a nonlinear spring and in combination with a conical surface-spherical surface composite sealing structure; the density of an inner cavity of the main buoy is adjustable to adapt to different oil products and working conditions; the nonlinear spring provides a gradient increasing reset force in a critical displacement interval, so that the sensitivity is improved; the device does not need external energy, the leakage rate is lower than 0.01 mL / min under the pressure of 10 bar, and the device is suitable for continuous and efficient separation of oil-containing wastewater.

Description

Technical Field

[0001] This utility model relates to an oil drain valve for an oil separator based on buoyancy adjustment, belonging to the field of oil-water separation technology. Background Technology

[0002] An oil drain valve is an important component of industrial equipment. Its main function is to discharge lubricating oil and unwanted gases to ensure the normal operation of the machine. The working principle of an oil drain valve typically involves opening and closing the valve to control the flow of oil. Under specific conditions, such as when the internal pressure of the equipment rises or reaches a preset value, the oil drain valve will automatically or manually open, allowing oil to drain from the equipment. This process helps reduce the internal pressure of the equipment, prevents overheating and damage, and ensures stable operation of the equipment.

[0003] Traditional mechanical float valves rely on a single buoyancy trigger. When the oil-water interface fluctuates or the oil density changes (such as due to temperature), they are prone to malfunctions (such as premature closure or delayed opening), resulting in excessive oil content in the drained water (>50ppm). Fixed threshold designs are difficult to adapt to different working conditions (such as high-viscosity greases and emulsified oil mixtures), requiring frequent manual calibration. Electrically controlled drain valves rely on external sensors and power sources, resulting in high energy consumption, circuit corrosion risks, and weak resistance to impurity interference. Utility Model Content

[0004] The purpose of this invention is to provide an oil discharge valve for an oil separator based on buoyancy adjustment to solve the above problems. It can achieve dynamic tracking of the oil-water interface through a purely mechanical structure and adaptively adjust the oil discharge threshold, while ensuring long-term sealing reliability and anti-pollution capability.

[0005] This utility model achieves the above-mentioned objective through the following technical solution: an oil drain valve for an oil separator based on buoyancy adjustment, comprising a valve body, a valve core installed inside the valve body, a sealing valve cover provided at the upper end of the valve body, a positioning mounting bracket installed inside the sealing valve cover, a guide rod plug being clamped inside the positioning mounting bracket, a return spring being fitted on the outer side of the guide rod plug, a spherical sealing body provided at the lower end of the guide rod plug, and a main float installed on the lower side of the spherical sealing body.

[0006] Preferably, in order to improve the connection effect of the device, the lower end of the mounting valve body is designed with a water inlet, and the upper end of the mounting valve body is provided with a fixing mounting plate around the perimeter, and the fixing mounting plate is provided with mounting thread holes around the perimeter.

[0007] Preferably, in order to facilitate the disassembly and assembly of the sealing valve cover, the sealing valve cover is provided with positioning threaded holes evenly distributed around its perimeter, and fixing bolts are installed in the internal threads of the positioning threaded holes. An output mounting hole is designed at the center of the sealing valve cover.

[0008] Preferably, in order to improve the performance of the device, a sealing positioning groove is provided inside the output mounting hole, a sealing ring is slidably engaged inside the sealing positioning groove, a fixed sealing gasket is installed on the outside of the sealing positioning groove, a sealing thread hole is provided around the fixed sealing gasket, the sealing thread hole extends into the inside of the sealing valve cover, and a tight-fitting bolt is threaded inside the sealing thread hole.

[0009] Preferably, in order to reduce the interference of fluid turbulence on the position of the float, a spiral guide plate and a porous flow stabilizing grid are provided at the valve body inlet. The inclination angle of the guide plate and the diameter of the grid holes are optimized according to the Reynolds number. The positioning mounting bracket is fixedly installed inside the output mounting hole. Output through holes are evenly designed around the positioning mounting bracket, and a positioning mounting hole is opened at the center of the positioning mounting bracket.

[0010] Preferably, in order to enable the device to exhibit high sensitivity response characteristics near the oil-water interface threshold, the guide rod plug is slidably engaged inside the positioning mounting hole, the upper end of the return spring is fixedly connected to the positioning mounting bracket, and the other end of the return spring is fixedly connected to the spherical sealing body. The return spring is a variable pitch spring.

[0011] Preferably, in order to facilitate the assembly and disassembly of the main buoy, a fixed threaded pipe is fixedly provided at the center of the spherical sealing body, and an installation threaded rod is fixedly installed at the upper end of the main buoy, with the installation threaded rod and the fixed threaded pipe being threadedly connected to each other.

[0012] Preferably, in order to improve the separation effect of the device, the main float adopts a double-layer hollow structure, with the inner layer filled with an adjustable density medium and the outer layer covered with an oleophobic and hydrophilic coating.

[0013] The beneficial effects of this invention are as follows: through the synergistic effect of the main float and the nonlinear spring, combined with the conical-spherical composite sealing structure, high-precision identification and adaptive control of the oil-water interface are achieved; the density of the main float cavity is adjustable to adapt to different oil types and operating conditions; the nonlinear spring provides a gradient-increased reset force in the critical displacement range, improving sensitivity; this device requires no external energy source, and the leakage rate is less than 0.01 mL / min at 10 bar pressure, making it suitable for continuous and efficient separation of oily wastewater. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0015] Figure 2 This is a nonlinear spring curve diagram of this utility model.

[0016] Figure 3This is a diagram of the variable pitch spring (non-linear) of this utility model.

[0017] In the diagram: 1. Valve body; 2. Valve core; 3. Sealing valve cover; 4. Positioning mounting bracket; 5. Guide rod plug; 6. Return spring; 7. Spherical seal; 8. Main float; 9. Fixing bolt; 10. Sealing ring; 11. Fixing gasket; 12. Sealing bolt. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figures 1-3 As shown, an oil drain valve for an oil separator based on buoyancy adjustment includes a valve body 1, a valve core 2 installed inside the valve body 1, a sealing valve cover 3 provided at the upper end of the valve body 1, a positioning mounting bracket 4 installed inside the sealing valve cover 3, a guide rod plug 5 clamped inside the positioning mounting bracket 4, a return spring 6 fitted on the outer side of the guide rod plug 5, a spherical sealing body 7 provided at the lower end of the guide rod plug 5, and a main float 8 installed on the lower side of the spherical sealing body 7.

[0020] The lower end of the valve body 1 is designed with a water inlet, and the upper end of the valve body 1 is provided with a fixed mounting plate around its perimeter. The fixed mounting plate is provided with mounting thread holes around its perimeter. The sealing valve cover 3 is provided with positioning thread holes evenly around its perimeter. The internal threads of the positioning thread holes are used to install fixing bolts 9. The center of the sealing valve cover 3 is designed with an output mounting hole.

[0021] The output mounting hole has a sealing positioning groove inside, and a sealing ring 10 is slidably engaged inside the sealing positioning groove. A fixed sealing gasket 11 is installed on the outside of the sealing positioning groove. A sealing thread hole is opened around the fixed sealing gasket 11, and the sealing thread hole extends into the interior of the sealing valve cover 3. A tight-fitting bolt 12 is threaded inside the sealing thread hole.

[0022] The valve body inlet is equipped with a spiral guide plate and a porous flow stabilizing grid. The inclination angle of the guide plate and the diameter of the grid are optimized according to the Reynolds number. The positioning mounting bracket 4 is fixedly installed inside the output mounting hole. Output through holes are evenly designed around the perimeter of the positioning mounting bracket 4. A positioning mounting hole is opened at the center of the positioning mounting bracket 4. The guide rod plug 5 is slidably engaged inside the positioning mounting hole. The upper end of the return spring 6 is fixedly connected to the positioning mounting bracket 4. The other end of the return spring 6 is fixedly connected to the spherical seal 7. The return spring 6 is a variable pitch spring.

[0023] A fixed threaded pipe is fixedly installed at the center of the spherical seal body 7, and an installation threaded rod is fixedly installed at the upper end of the main float 8. The installation threaded rod and the fixed threaded pipe are connected by threads.

[0024] The main buoy 8 adopts a double-layer hollow structure, with the inner layer filled with an adjustable density medium and the outer layer covered with an oleophobic and hydrophilic coating.

[0025] The control logic of this device is as follows:

[0026] Define the equilibrium equation for the pontoon as Fbuoyancy + Fspring = Gfloat + Fhydrostatic, where Fbuoyancy is the buoyancy, Fspring is the spring force, Gfloat is the weight of the pontoon, and Fhydrostatic is the hydrostatic pressure. By adjusting the spring preload and the pontoon counterweight, the system triggers Fbuoyancy > Gfloat + Fhydrostatic when the oil phase accumulates (buoyancy increases). Fspring pushes the valve plate to open; when the water phase ratio increases, the buoyancy decreases, and the spring force dominates the reset, realizing the closure of the spherical seal 7.

[0027] The main pontoon 8 adopts a double-layer hollow structure, with the inner layer filled with an adjustable density medium (such as salt solution) and the outer layer covered with an oleophobic and hydrophilic coating; a spiral guide plate and a flow stabilizing grid are introduced to reduce the interference of fluid turbulence on the position of the pontoon; the spring stiffness curve is optimized through finite element simulation to make it exhibit high sensitivity response characteristics near the oil-water interface threshold.

[0028] Through the coordinated design of buoy density and spring stiffness, buoyancy deviations caused by changes in temperature and oil density can be automatically compensated (measured applicable density range: 0.75~1.05 g / cm³); the nonlinear spring improves control accuracy in the small displacement stage (sensitivity increased by 40%), which can enhance dynamic adaptability.

[0029] The stiffness curve of the return spring 6 satisfies:

[0030] k(x) = k0 + αx2, where k0 is the initial stiffness, α is the nonlinear coefficient, and x is the spring compression.

[0031] The composite sealing structure has a leakage rate of <0.01mL / min at 10bar pressure. The flow guiding system reduces the displacement fluctuation of the float by 60%. The design that reduces malfunctions can improve the reliability of the device. No external energy and control system is required, and the maintenance cycle is extended to more than 2 years. The counterweight module can quickly adapt to different working conditions, reduce downtime for debugging, and improve the economic efficiency of the device.

[0032] When used for industrial wastewater treatment, the main float 8 is made of 304 stainless steel with an inner cavity filled with a glycerol-water mixture of adjustable density, with an overall density of 0.90 g / cm³. The return spring 6 is a variable pitch 316L stainless steel spring with an initial stiffness of 5 N / mm, which increases to 8 N / mm when compressed to the working point. The spherical seal is set with a valve core 2 cone angle of 55°, and the valve plate spherical seal 7 is made of fluororubber-polytetrafluoroethylene composite material. Wastewater enters from the bottom of the valve body, and after being stabilized by the guide plate, the oil phase floats to the top. When the oil layer thickness reaches 15 mm, the float moves upward beyond the critical displacement (3 mm), the spring enters the high stiffness range, and the valve plate quickly opens to discharge oil. During the drainage stage, the water level rises, the float sinks, and the spring force drives the sealing pair to close.

[0033] When used for industrial emulsified oil separation, an auxiliary ultrasonic demulsification module is integrated at the valve body inlet; the inner cavity of the main float 8 is dynamically adjusted by an external PID controller to change to an electromagnetically adjustable density structure.

[0034] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0035] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An oil drain valve for an oil separator based on buoyancy adjustment, characterized in that: The device includes a valve body (1), a valve core (2) is installed inside the valve body (1), a sealing valve cover (3) is provided at the upper end of the valve body (1), a positioning mounting bracket (4) is installed inside the sealing valve cover (3), a guide rod plug (5) is clamped inside the positioning mounting bracket (4), a return spring (6) is fitted on the outside of the guide rod plug (5), the return spring (6) is a variable pitch spring, a spherical sealing body (7) is provided at the lower end of the guide rod plug (5), and a main float (8) is installed on the lower side of the spherical sealing body (7).

2. The drain valve for an oil separator based on buoyancy adjustment according to claim 1, characterized in that: The lower end of the mounting valve body (1) is designed with a water inlet, and the upper end of the mounting valve body (1) is provided with a fixed mounting plate around its perimeter. The fixed mounting plate is provided with mounting thread holes around its perimeter.

3. The oil drain valve for an oil separator based on buoyancy adjustment according to claim 2, characterized in that: The sealing valve cover (3) is provided with positioning threaded holes evenly distributed around its perimeter. Fixing bolts (9) are installed in the internal threads of the positioning threaded holes. An output mounting hole is designed at the center of the sealing valve cover (3).

4. The drain valve for an oil separator based on buoyancy adjustment according to claim 3, characterized in that: The output mounting hole has a sealing positioning groove inside, and a sealing ring (10) is slidably engaged inside the sealing positioning groove. A fixed sealing gasket (11) is installed on the outside of the sealing positioning groove. A sealing thread hole is opened around the fixed sealing gasket (11). The sealing thread hole extends into the inside of the sealing valve cover (3). A tight-fitting bolt (12) is threaded inside the sealing thread hole.

5. The drain valve for an oil separator based on buoyancy adjustment according to claim 3, characterized in that: The valve body (1) is provided with a spiral guide plate and a multi-hole flow stabilizing grid at the inlet. The inclination angle of the guide plate and the diameter of the grid are optimized according to the Reynolds number. The positioning mounting bracket (4) is fixedly installed inside the output mounting hole. The positioning mounting bracket (4) is uniformly designed with output through holes around its perimeter. The positioning mounting bracket (4) is provided with a positioning mounting hole at its center.

6. The oil drain valve for an oil separator based on buoyancy adjustment according to claim 5, characterized in that: The guide rod plug (5) is slidably engaged inside the positioning mounting hole, the upper end of the return spring (6) is fixedly connected to the positioning mounting bracket (4), and the other end of the return spring (6) is fixedly connected to the spherical sealing body (7).

7. The drain valve for an oil separator based on buoyancy adjustment according to claim 1, characterized in that: A fixed threaded tube is fixedly installed at the center of the spherical seal (7), and an installation threaded rod is fixedly installed at the upper end of the main float (8). The installation threaded rod and the fixed threaded tube are threadedly connected to each other.

8. The drain valve for an oil separator based on buoyancy adjustment according to claim 1, characterized in that: The main buoy (8) adopts a double-layer hollow structure, with the inner layer filled with an adjustable density medium and the outer layer covered with an oleophobic and hydrophilic coating.

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