Oil-gas separator with draining function

Abstract

The oil-gas separator comprises an LVS body, an LVS separation part, an upper shell and a bottom support, the LVS body and the upper shell are connected to form a cavity, the LVS body and the bottom support are connected to form a liquid drainage cavity, the LVS separation part is connected with the LVS body and the upper shell and divides the cavity into an exhaust cavity, a separation cavity and a liquid storage cavity, and the liquid storage cavity is connected with the separation part. The top of the LVS separating part is provided with an exhaust hole used for communicating the exhaust cavity with the liquid storage cavity, the LVS body is provided with a liquid return hole used for communicating the liquid storage cavity with the liquid drainage cavity, a gap used for communicating the separating cavity with the liquid storage cavity is reserved between the bottom of the LVS separating part and the inner wall of the LVS body, and an LVS floater capable of moving up and down is arranged in the liquid storage cavity. The top of the LVS floater is provided with an LVS sealing piece used for achieving opening and closing of the exhaust hole, a DV valve used for achieving opening and closing of the liquid return hole is arranged in the liquid drainage cavity, and a plurality of liquid outlet holes are formed in the bottom support. Fuel oil can be prevented from leaking to the carbon tank when the vehicle rolls over.

Description

Technical Field

[0001] The invention belongs to the technical field of oil-gas separators, and in particular relates to an oil-gas separator with a draining function. Background Art

[0002] The Liquid-Vapor Separator (LVS) is placed between the fuel tank and the charcoal canister. When the gas in the fuel tank is discharged and the fuel shakes, the gas will bring out the liquid fuel. At this time, the liquid-vapor separator takes effect, retaining the liquid fuel in the oil-vapor separator, while the gas passes through the oil-vapor separator and enters the charcoal canister.

[0003] The existing oil-gas separator outlet is located at the end position, and a maze structure is designed between the air inlet and the air outlet to block the fuel. However, when the entire vehicle tilts toward the air outlet, the fuel in the oil-gas separator will flow out through the air outlet into the charcoal canister, affecting the service life of the charcoal canister and polluting the environment. Summary of the Invention

[0004] The purpose of the present invention is to provide an oil-gas separator with a drain function, which can automatically close the fuel passage when the vehicle accelerates, brakes, tilts or even rolls over to prevent fuel from leaking into the carbon canister.

[0005] The objective of the present invention is achieved as follows: An oil-gas separator with a drainage function comprises an LVS body, an LVS separator, an upper shell and a bottom support, the LVS body being connected to the upper shell to form a cavity and being connected to the bottom support to form a drainage cavity, the LVS separator being connected to the LVS body and the upper shell and dividing the cavity into an exhaust cavity, a separation cavity and a liquid storage cavity, an exhaust hole being provided on the top of the LVS separator to connect the exhaust cavity and the liquid storage cavity, a return hole being provided on the LVS body to connect the liquid storage cavity and the drainage cavity, a gap being left between the bottom of the LVS separator and the inner wall of the LVS body to connect the separation cavity and the liquid storage cavity, an LVS float being movable up and down being provided in the liquid storage cavity, an LVS seal being provided on the top of the LVS float to realize opening and closing of the exhaust hole, a DV valve being provided in the drainage cavity to realize opening and closing of the return hole, and a plurality of liquid outlet holes being provided on the bottom support.

[0006] When the present invention is used, oil and gas first enter the separation chamber and continuously hit the LVS separator. The separated oil flows down along the side wall of the LVS separator and enters the liquid storage chamber through the gap for temporary storage. When the liquid level in the liquid storage chamber does not reach the trigger height, the LVS float is in a low position, the top seal does not close the exhaust hole, and the separated gas continues to rise and is discharged into the carbon canister through the exhaust hole; when the liquid level in the liquid storage chamber rises to the set height, the LVS float is pushed up by the buoyancy, and the top LVS seal closes the exhaust hole to prevent gas and liquid from mixing. The pressure in the liquid storage chamber increases, and the oil in the liquid storage chamber is driven by gravity and the pressure in the chamber to return to the liquid through the return hole It flows into the drain chamber and is eventually discharged back into the oil tank through the outlet hole. After the system is shut down, the oil-gas mixture stops entering, the DV valve component moves completely downward under the action of gravity, the return hole maintains its maximum opening, and the remaining liquid in the reservoir chamber continues to flow into the drain chamber through the return hole under the action of gravity and is completely drained through the outlet hole. The liquid level drops to zero to avoid oil residue. When the liquid level in the reservoir chamber drops to a low level, the LVS float drops and the vent hole reopens to prepare for the next start-up. When the liquid level in the drain chamber (oil tank) reaches the closing height, the DV valve component closes the return hole under the action of buoyancy to prevent the oil in the tank from flowing back.

[0007] Compared with the prior art, the present invention has the following advantages: the upper part of the oil-gas separator discharges gas, and the lower part has a drain structure to return the fuel to the fuel tank, thereby preventing excessive fuel from accumulating at the bottom of the liquid storage chamber; when the vehicle accelerates, brakes, tilts or turns, the violent shaking of the fuel will cause the LVS float to temporarily deflect and close at an angle, thereby reducing the overflow of fuel vapor into the carbon canister; when the vehicle rolls over, the LVS float drives the LVS seal to close the exhaust hole under the action of gravity, automatically closing the fuel passage and preventing fuel from leaking into the carbon canister; the oil-gas separation structure is compact, and the float structure design is conducive to the oil-gas separation of fuel vapor.

[0008] As a further improvement of the present invention, the LVS body includes a bottom plate, an upper cylinder and a lower cylinder are respectively provided on the upper and lower sides of the bottom plate, a plurality of arc-shaped plates for cooperating with the LVS separator are provided on the top of the upper cylinder, an oil and gas inlet connector and a plurality of connecting ears are provided on the outer periphery of the upper cylinder, the oil and gas inlet connector is communicated with the separation chamber, the connecting ears are used to cooperate with the upper shell, and a plurality of clamping blocks for cooperating with the bottom bracket are provided on the outer periphery of the lower cylinder. The LVS body separates the upper cylinder and the lower cylinder by the bottom plate, realizing modularization of functional areas and avoiding liquid retention or gas backflow; the arc-shaped plate on the top of the upper cylinder forms a curved surface fit with the LVS separator, increasing the contact area, ensuring the coaxiality and sealing of the LVS separator during installation, and avoiding oil and gas leakage or liquid bypass.

[0009] As a further improvement to the present invention, a sealing ring (1) is disposed between the upper shell and the LVS body. A limiting ring and a limiting boss are provided on the upper and lower sides of the LVS body, corresponding to sealing ring (1), respectively. The limiting boss abuts the upper shell. The limiting ring and the limiting boss form a clamping space, precisely confining sealing ring (1) to a set position, preventing axial movement or radial extrusion due to pressure fluctuations or vibrations, thereby avoiding seal failure. The limiting boss abuts the upper shell, ensuring that sealing ring (1) is compressed to a preset thickness during assembly, preventing plastic deformation caused by overcompression or leakage caused by insufficient compression.

[0010] As a further improvement to the present invention, the LVS separator comprises an open-bottomed cylinder with several mounting brackets positioned around its periphery for mating with the LVS body. Inside the cylinder are several annular guide bars, designed to ensure the LVS seal and vent are always aligned. The separated liquid oil naturally drains through the cylinder's bottom opening into the reservoir, while the gas rises along the cylinder's inner wall, creating a stratified flow and reducing the risk of secondary mixing. The guide bars offset seal deflection caused by high vibration environments, ensuring sealing stability.

[0011] As a further improvement to the present invention, a second sealing ring is positioned between the upper housing and the LVS separator. An annular groove is provided on the outer circumference of the LVS separator, corresponding to the second sealing ring. This groove provides room for thermal expansion. Combined with a dual-stage sealing design, this achieves a highly reliable seal at a low cost, resolving the pain points of traditional oil-gas separators, which are prone to seal failure and cumbersome maintenance. This significantly improves the separator's seal life and operational stability, particularly in high-vibration, high-pressure differential, and complex media environments.

[0012] As a further improvement to the present invention, the upper shell includes a top plate, with an outer cylinder and an inner cylinder disposed below the top plate. The outer cylinder has a plurality of slots at its bottom for mating with the LVS body, and the inner cylinder has a mounting slot at its bottom for mating with the LVS separator. The inner cylinder serves as a gas ascending channel, restricting the airflow path, extending the gas-liquid contact time, and promoting gravitational settling or centrifugal separation of tiny oil droplets. The outer cylinder and the LVS body form an annular separation chamber, forcing the oil-gas mixture to rotate tangentially along the annular narrow slit, significantly improving oil-gas separation efficiency compared to traditional labyrinth-style separation chambers.

[0013] As a further improvement of the present invention, the upper housing includes an exhaust connector and a vent connector. The exhaust connector communicates with the exhaust chamber, while the vent connector communicates with the separation chamber. The oil-gas inlet connector is positioned opposite the exhaust connector and the vent connector. This positioning forces the oil-gas mixture to flow along its maximum travel after entering the separation chamber, extending the gas-liquid contact time and improving separation efficiency.

[0014] As a further improvement of the present invention, a welding flange is snap-connected to the top of the upper shell, and the welding flange includes a flange seat. A plurality of plug-in ears are provided on the lower side of the flange seat, and the upper side is covered with connecting columns. The upper shell includes a plurality of mounting rings for connecting to the plug-in ears.

[0015] As a further improvement of the present invention, the DV valve element comprises a DV spring mounted on a base. A DV float is mounted on the upper end of the DV spring, capable of moving up and down within the drainage chamber. A DV seal is mounted on the top of the DV float, and drainage channels are defined on the outer periphery corresponding to the drainage holes. The balance between the DV float and the spring allows for dynamic opening and closing of the drainage hole, achieving both drainage and self-locking.

[0016] As a further improvement to the present invention, the base is equipped with a guide post with several clips on its periphery for mating with the LVS body. The lower end of the DV spring is sleeved over the guide post. The plurality of liquid outlets are evenly spaced in a circular pattern centered on the guide post. This circular arrangement of outlets evenly releases pressure from the drainage chamber, preventing abnormal opening and closing of the DV seal due to high pressure at a single point. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0018] Figure 2 It is a top view of the present invention.

[0019] Figure 3 for Figure 1 Cross-section view at AA in the middle.

[0020] Figure 4 for Figure 1 Cross-section view at the middle BB.

[0021] Figure 5 Schematic diagram of the three-dimensional structure of the LVS separation component.

[0022] Figure 6 This is an exploded view of the DV valve.

[0023] Among them, 1 LVS body, 101 bottom plate, 102 upper cylinder, 103 lower cylinder, 104 curved plate, 104a positioning groove, 105 oil and gas inlet joint, 106 connecting ear, 107 block, 108 limit ring, 109 limit boss, 110 return hole, 2 LVS separator, 201 cylinder, 202 mounting seat, 202a through groove, 202b positioning convex block, 203 guide strip, 204 annular groove, 205 exhaust hole, 3 upper shell, 301 outer cylinder, 301a slot, 302 inner cylinder, 302a mounting groove, 303 exhaust joint, 304 ventilation joint, 305 mounting ring, 4 bottom bracket, 401 liquid outlet, 402 guide column, 403 buckle, 5 LVS float, 6 LVS seal, 7 DV valve, 701 DV spring, 702DV float, 702a drainage channel, 703 DV seal, 8 welding flange, 801 flange seat, 802 plug-in ear, 803 connecting column, 9 exhaust chamber, 10 separation chamber, 11 liquid storage chamber, 12 drainage chamber, 13 sealing ring 1, 14 sealing ring 2, 15 gap. DETAILED DESCRIPTION

[0024] like Figure 1-4 As shown, an oil-gas separator with a draining function includes an LVS body 1, an LVS separator 2, an upper shell 3 and a bottom bracket 4. The LVS body 1 is connected to the upper shell 3 to form a cavity, and is connected to the bottom bracket 4 to form a drainage cavity 12. The LVS separator 2 is connected to the LVS body 1 and the upper shell 3 and divides the cavity into an exhaust cavity 9, a separation cavity 10 and a liquid storage cavity 11. The top of the LVS separator 2 is provided with an exhaust hole 205 for connecting the exhaust cavity 9 and the liquid storage cavity 11. The LVS body 1 is provided with a return hole 110 for connecting the liquid storage cavity 11 and the drain cavity 12. A gap 1 is left between the bottom of the LVS separator 2 and the inner wall of the LVS body 1 to connect the separation cavity 10 and the liquid storage cavity 11. 5. An LVS float 5 that can move up and down is provided in the liquid storage chamber 11. An LVS seal 6 is provided on the top of the LVS float 5 to realize the opening and closing of the exhaust hole 205. A DV (Drain Valve) valve is provided in the drain chamber 12 to realize the opening and closing of the return liquid hole 110. Eight liquid outlet holes 401 are provided on the base 4. When matching with a plastic fuel tank, a welding flange 8 is engaged and connected at the top of the upper shell. The welding flange 8 includes a flange seat 801. Four plug-in ears 802 are provided on the lower side of the flange seat 801, and the upper side is covered with connecting columns 803 for connection with the fuel tank. When matching with a metal fuel tank, the welding flange 8 on the top of the upper shell can be replaced with a metal bracket. No more details are given here.

[0025] The upper shell 3 includes a top plate, and an outer cylinder 301 and an inner cylinder 302 are provided on the lower side of the top plate. The bottom of the outer cylinder 301 is provided with two card slots 301a for cooperating with the LVS body 1, and the periphery is provided with an exhaust joint 303, a ventilation joint 304 and four mounting rings 305 for connecting with the plug-in ear 802. The exhaust joint 303 is connected to the exhaust chamber 9, and the ventilation joint 304 is connected to the separation chamber 10; the bottom of the inner cylinder 302 is provided with a mounting groove 302a for cooperating with the LVS separator 2.

[0026] The LVS body 1 includes a bottom plate 101, and an upper cylinder 102 and a lower cylinder 103 are respectively provided on the upper and lower sides of the bottom plate 101. Two arc-shaped plates 104 for cooperating with the LVS separator 2 are provided on the top of the upper cylinder 102. An oil and gas inlet joint 105 and two symmetrically distributed connecting ears 106 are provided on the outer periphery of the upper cylinder 102. The oil and gas inlet joint 105 is communicated with the separation chamber 10 and is arranged opposite to the exhaust joint 303 and the vent joint 304. The connecting ears 106 are used to cooperate with the upper shell 3. Four blocks 107 for cooperating with the bottom support 4 are provided on the outer periphery of the lower cylinder 103, which facilitates quick assembly while clarifying the structural division of labor. The upper cylinder 102 focuses on gas separation, and the lower cylinder 103 collects liquid components and processes the gas-liquid two phases in layers.

[0027] In order to improve the sealing performance between the upper shell 3 and the LVS body 1, a sealing ring 13 is provided between the outer cylinder 301 and the upper cylinder 102. In order to prevent the sealing ring 13 from axial movement or radial extrusion due to pressure fluctuations or vibrations, a limiting ring 108 and a limiting boss 109 are respectively provided on the upper and lower sides of the outer cylinder 301 corresponding to the sealing ring 13, and the upper side of the limiting boss 109 abuts against the lower side of the outer cylinder 301.

[0028] like Figure 5 As shown, the LVS separator 2 includes a cylinder 201 with an opening at the bottom, and two mounting seats 202 for cooperating with the LVS body 1 are provided on the outer circumference of the cylinder 201. A through groove 202a is provided in the mounting seat 202 for accommodating the arc plate 104 to pass through, and a positioning protrusion 202b is provided in the through groove 202a. The arc plate 104 is provided with a positioning groove 104a for engaging with the positioning protrusion 202b; four annularly distributed guide strips 203 are provided in the cylinder 201, and the guide strips 203 are used to ensure that the LVS seal 6 and the exhaust hole 205 are always located on the same axis; a sealing ring 214 is provided between the upper shell 3 and the LVS separator 2, and an annular groove 204 is provided on the outer circumference of the cylinder 201 corresponding to the sealing ring 214. The annular groove 204 circumferentially wraps the sealing ring 214 to limit its micro-displacement under high-frequency vibration, thereby preventing leakage due to friction and wear at the sealing interface.

[0029] like Figure 6As shown, the DV valve member 7 includes a DV spring 701 arranged on the base 4, and a DV float 702 that can move up and down in the drainage chamber 12 is provided at the upper end of the DV spring 701. A DV seal 703 is provided on the top of the DV float 702, and a drainage channel 702a is provided on the outer periphery corresponding to the drainage hole; a guide column 402 is provided on the base 4, and four buckles 403 for cooperating with the block 107 are provided on the outer periphery. The lower end of the DV spring 701 is sleeved on the outside of the guide column 402, and the eight liquid outlet holes 401 are distributed in a ring with equal intervals around the guide column 402 as the center.

[0030] The working principle of the present invention is as follows: 1. Oil and gas separation stage: The oil-gas mixture enters the annular separation chamber 10 through the oil-gas inlet connector 105 and the vent connector 304. Due to the curved path, the flow direction suddenly changes. Oil droplets collide with the chamber wall due to inertia, causing initial gas-liquid separation. The high-density droplets settle, and the separated gas rises through the exhaust hole 205 into the exhaust chamber 9, and is finally discharged from the system through the exhaust connector 303. The liquid (fuel) flows into the liquid storage chamber 11 through the gap 15. At this time, the liquid level in the liquid storage chamber 11 is low, the LVS float 5 is not triggered, the exhaust hole 205 remains open, and the gas escapes normally.

[0031] 2. Liquid level control and sealing stage: The fuel accumulated in the liquid storage chamber 11 causes the liquid level to rise, pushing the LVS float 5 upward and driving the LVS seal 6 gradually close to the exhaust hole 205; when the liquid level exceeds the set height, the LVS seal 6 closes the exhaust hole 205 to prevent the gas from flowing back to the liquid storage chamber 11, while maintaining a reasonable pressure in the chamber. Driven by gravity and the pressure in the chamber, the fuel flows into the discharge chamber 12.

[0032] 3. Drainage control and backflow prevention mechanism: The fuel flows back to the fuel tank from the liquid outlet 401 of the base 4 along the discharge channel 702a of the float, completing the fuel circulation. When the liquid level in the discharge chamber 12 rises to the closing height, the DV float 702 at its bottom overcomes its own weight due to buoyancy and elastic force and floats upward, driving the DV seal 703 at the top to close the return hole 110 upward, preventing further injection of fuel into the discharge chamber 12. The DV valve member 7 closes the return channel when the liquid level in the fuel tank is high, preventing fuel from flowing back into the separator and ensuring efficient gas-liquid separation.

[0033] 4. Emptying and exhausting the liquid storage chamber 11: The liquid level in the liquid storage chamber 11 drops as the liquid is discharged, and the LVS float 5 moves downward due to the loss of support gravity, and the exhaust hole 205 reopens. At this time, the separation chamber 10 is directly connected to the exhaust chamber 9, and the system resumes normal exhaust capacity to avoid pressure imbalance caused by gas accumulation.

[0034] 5. Implementation of the drain function: During the drainage process, the drainage chamber 12 is connected to the fuel tank, the pressure tends to be consistent, and the fuel is completely discharged under the assistance of gravity and negative pressure (such as engine suction), achieving residue-free drainage.

[0035] The advantages of the present invention are as follows: the LVS float 5 controls the opening and closing of the exhaust hole 205 by the change of the liquid level in the liquid storage chamber 11, thereby balancing the gas discharge and the liquid storage pressure; the DV float 702 controls the opening and closing of the return hole 110 by the change of the liquid level in the discharge chamber 12, ensuring that the discharge chamber 12 is emptied first before receiving new liquid, thereby preventing liquid resistance; the liquid levels in the liquid storage chamber 11 and the discharge chamber 12 rise and fall alternately, forming a cycle of "liquid storage-liquid discharge-re-liquid storage", and finally completely draining the liquid through the liquid outlet 401 without manual intervention; through mechanical float The automatic feedback adjustment of the separator achieves a balance between oil-gas separation and efficient liquid drainage, avoiding the common problems of liquid flooding or delayed drainage in traditional separators; the LVS separator 2 integrates multi-cavity functions, reduces external pipeline connections, reduces leakage risks, extends the gas-liquid contact path, and improves separation efficiency; the annular separation chamber 10 extends the transportation path of the oil-gas mixture, increases the oil-gas separation time and intensity, and avoids the "dead zone" or turbulent interference common in traditional box-type separators, reduces secondary entrainment of oil droplets, and improves separation efficiency.

[0036] The present invention is not limited to the above-mentioned embodiments. On the basis of the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some of the technical features therein according to the disclosed technical content without creative labor, and these substitutions and modifications are all within the protection scope of the present invention.

Claims

1. An oil-gas separator with a drain function, characterized in that: The utility model comprises an LVS body, an LVS separator, an upper shell and a bottom support. The LVS body is connected with the upper shell to form a cavity, and is connected with the bottom support to form a drainage cavity. The LVS separator is connected with the LVS body and the upper shell and divides the cavity into an exhaust cavity, a separation cavity and a liquid storage cavity. An exhaust hole for connecting the exhaust cavity and the liquid storage cavity is provided on the top of the LVS separator. A return hole for connecting the liquid storage cavity and the exhaust cavity is provided on the LVS body. A gap for connecting the separation cavity and the liquid storage cavity is left between the bottom of the LVS separator and the inner wall of the LVS body. An LVS float that can move up and down is provided in the liquid storage cavity. An LVS seal for realizing opening and closing of the exhaust hole is provided on the top of the LVS float. A DV valve component for realizing opening and closing of the return hole is provided in the drainage cavity. A plurality of liquid outlet holes are provided on the bottom support.

2. The oil-gas separator with drainage function according to claim 1, characterized in that: The LVS body includes a base plate, and an upper cylinder and a lower cylinder are respectively provided on the upper and lower sides of the base plate. A plurality of arc-shaped plates for cooperating and connecting with the LVS separator are provided on the top of the upper cylinder. An oil and gas inlet joint and a plurality of connecting ears are provided on the outer periphery of the upper cylinder. The oil and gas inlet joint is communicated with the separation chamber, and the connecting ears are used to cooperate and connect with the upper shell. A plurality of blocks for cooperating and connecting with the bottom bracket are provided on the outer periphery of the lower cylinder.

3. The oil-gas separator with drainage function according to claim 1, characterized in that: A sealing ring 1 is provided between the upper shell and the LVS body. A limiting ring and a limiting boss are respectively provided on the upper and lower sides of the LVS body corresponding to the sealing ring 1. The limiting boss abuts against the upper shell.

4. The oil-gas separator with drainage function according to claim 1, characterized in that: The LVS separator includes a cylinder with an open bottom, and a plurality of mounting seats for cooperating with the LVS body are provided on the outer circumference of the cylinder. A plurality of guide strips distributed in an annular shape are provided inside the cylinder, and the guide strips are used to ensure that the LVS seal and the exhaust hole are always located on the same axis.

5. The oil-gas separator with drainage function according to claim 1, characterized in that: A second sealing ring is provided between the upper shell and the LVS separator, and an annular groove is provided on the outer periphery of the LVS separator corresponding to the second sealing ring.

6. The oil-gas separator with drainage function according to claim 1, characterized in that: The upper shell includes a top plate, and an outer cylinder and an inner cylinder are provided on the lower side of the top plate. The bottom of the outer cylinder is provided with several slots for cooperating with the LVS body, and the bottom of the inner cylinder is provided with an installation slot for cooperating with the LVS separator.

7. The oil-gas separator with drainage function according to claim 1, characterized in that: The upper shell includes an exhaust joint and a vent joint, the exhaust joint is communicated with the exhaust chamber, the vent joint is communicated with the separation chamber, and the oil and gas inlet joint is arranged opposite to the exhaust joint and the vent joint.

8. The oil-gas separator with drainage function according to claim 1, characterized in that: The top of the upper shell is snap-fitted with a welding flange, which includes a flange seat. The lower side of the flange seat is provided with a plurality of plug-in ears, and the upper side is covered with connecting columns. The upper shell includes a plurality of mounting rings for connecting with the plug-in ears.

9. The oil-gas separator with drainage function according to claim 1, characterized in that: The DV valve element includes a DV spring arranged on a bottom support, a DV float which can move up and down in a drainage cavity is arranged on the upper end of the DV spring, a DV seal is arranged on the top of the DV float, and a drainage channel is opened on the outer periphery corresponding to the drainage hole.

10. The oil-gas separator with drainage function according to claim 1, characterized in that: A guide column is provided on the bottom bracket, and a plurality of buckles for connecting with the LVS body are provided on the outer periphery. The lower end of the DV spring is sleeved outside the guide column, and the plurality of liquid outlet holes are distributed in a ring-like manner with the guide column as the center at equal intervals.

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