Oil-gas separation device

Abstract

The oil-gas separation device comprises an outer shell, a first gas outlet, a second oil return opening and a second gas inlet which are used for exhausting gas are formed in the outer shell, a first cavity is formed in the outer shell, a filtering piece is arranged in the first cavity and provided with a gas filtering layer and a gas exhaust opening, the gas exhaust opening is communicated with the first gas outlet, and the second gas outlet is communicated with the second oil return opening. A containing gap is formed between the gas filtering layer and the first cavity, and when gas is filtered, the gas input from the second gas inlet sequentially flows through the containing gap, the gas filtering layer, the gas outlet and the first gas outlet. The filter element has the beneficial effects that gas flows from the outside of the filter element to the inside of the filter element so as to realize a filtering effect, and filtered lubricating oil and impurities are left on the outer surface of the gas filtering layer and in the accommodating gap, so that the lubricating oil and the impurities are more easily collected to the bottom of the outer shell due to the action of gravity; therefore, the filtering effect of the oil-gas separation device for filtering lubricating oil and impurities is enhanced, and the service life of the first filter element is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of devices for separating or filtering gas or steam, in particular to an oil-gas separation device. Background Art

[0002] In production and life, it is usually necessary to use a vacuum pump or an air compressor to pump gas to achieve ventilation, provide power to the cylinder, or suck the workpiece and transfer it.

[0003] The vacuum pump or air compressor includes an air intake structure, a machine head and an oil-gas separation structure. When working, the gas flows through the air intake structure, the machine head and the oil-gas separation structure in sequence. The oil-gas separation structure is used to filter the lubricating oil carried by the gas flowing through the machine head. However, the prior art has the following shortcomings: 1. A filter element for filtering gas is provided in the oil-gas separation structure. The filter element is cup-shaped as a whole. An air inlet is provided at one end of the filter element. A filter layer is provided on the side wall of the filter element. The gas enters the filter element from the air inlet, and is discharged after the lubricating oil and impurities are filtered out by the filter layer. In the process of continuous filtering, the filtered lubricating oil and impurities are retained inside the filter element, and it is not easy to discharge the filter element through the air inlet when the gas continues to flow in. These lubricating oil and impurities are easily carried away by the subsequent gas and pass through the filter layer, thereby being discharged from the oil-gas separation structure, so the filtering effect is relatively poor; 2. In the working process, the lubricating oil and impurities attached to the filter layer are also easily entrained by the subsequent gas and diffused to various places in the filter layer, resulting in a short service life of the filter element. Utility Model Content

[0004] The main purpose of the utility model is to provide an oil-gas separation device, aiming to solve the technical problems of poor filtering effect and short service life of the filter element in the prior art.

[0005] The technical solution adopted by the utility model is as follows: an oil-gas separation device comprises an outer shell, the outer shell is provided with a first air outlet for discharging gas, a second oil return port for discharging lubricating oil and impurities, and a second air inlet for inputting gas, a first cavity is provided in the outer shell, a filter is provided in the first cavity, the filter has an air filter layer for filtering gas and an exhaust port for discharging gas, the exhaust port is communicated with the first air outlet, a containing gap is provided between the air filter layer and the first cavity, when filtering gas, the gas inputted from the second air inlet flows through the containing gap, the air filter layer, the exhaust port and the first air outlet in sequence and then is discharged from the outer shell.

[0006] As a preferred embodiment of the utility model, a partition is provided in the outer shell, and the partition divides the interior of the outer shell into a first cavity and a second cavity. The first cavity is located in the upper part of the outer shell, and the second cavity includes a ventilation section located in the upper part of the outer shell, and the cross-section of the ventilation section is circular. The partition and the first cavity are arranged on the inner side of the circular ring of the ventilation section in sequence, and an upper connecting port is provided between the first cavity and the ventilation section, and the gas input from the second air inlet enters the containing gap through the ventilation section.

[0007] As a preferred embodiment of the utility model, the second cavity also includes an oil storage section located below the ventilation section and the first cavity, the second air inlet and the second oil return port are both connected to the oil storage section, a lower connecting port is provided between the first cavity and the oil storage section, the gas input from the second air inlet enters the ventilation section through the oil storage section, and the gas in the accommodating gap can enter the oil storage section through the lower connecting port, and then enter the accommodating gap through the ventilation section.

[0008] As a preferred embodiment of the present utility model, the filter element is a first filter element, the first filter element is cup-shaped as a whole, a third air outlet is provided at the upper end of the first filter element, the side wall of the first filter element is a first annular filter layer, the bottom of the first filter element is a first bottom cover, the third air outlet is connected to the first air outlet, and the accommodating gap is the first gap between the outer surface of the first filter element and the first cavity.

[0009] As a preferred embodiment of the utility model, a plurality of second filter elements are provided in the first cavity, the second filter element is cup-shaped as a whole, a fourth air outlet is provided at the upper end of the second filter element, the side wall of the second filter element is a ring-shaped second filter layer, the bottom of the second filter element is a second bottom cover, the fourth air outlets of the plurality of second filter elements are all connected to the first air outlet, and the accommodating gap is the second gap between the plurality of second filter elements and between the second filter element and the second cavity.

[0010] As a preferred embodiment of the present utility model, a flange is further provided in the outer shell, and the second filter element is installed in the first cavity through the flange.

[0011] As a preferred embodiment of the utility model, a first oil return pipe is provided on the side of the first oil return port facing the inner part of the outer shell, and the first oil return pipe extends into the lower part of the outer shell through the first cavity, and the lubricating oil in the lower part of the outer shell can be discharged from the outer shell through the first oil return pipe and the first oil return port

[0012] As a preferred embodiment of the utility model, the second oil return port is arranged at the bottom of the outer shell, the second air inlet is arranged above the second oil return port, and one end of the first oil return pipe extending into the lower part of the outer shell is located above the second air inlet.

[0013] As a preferred embodiment of the utility model, the outer shell includes a lower cylinder and an upper cover, which are detachably connected, a second air inlet and a second oil return port are arranged at the lower part of the lower cylinder, and a first air outlet and a first oil return port are arranged on the upper cover.

[0014] Compared with the prior art, the beneficial effects of the utility model are: 1. When filtering gas, the gas input from the second air inlet flows through the containing gap, the air filter layer, the exhaust port and the first air outlet in sequence and then is discharged from the outer shell. Since the gas flows from the outside of the filter element to the inside of the filter element to achieve the filtering effect, the filtered lubricating oil and impurities are retained on the outer surface of the air filter layer and in the containing gap. This structure makes it easier for the lubricating oil and impurities to gather at the bottom of the oil storage section due to gravity, thereby enhancing the filtering effect of the oil-gas separation device to filter out lubricating oil and impurities and extending the service life of the first filter element; 2. The partition separates the lower cylinder into the first cavity and the second cavity, and forms a ventilation section at the upper part of the second cavity, so that the gas forms an upward cyclone after entering the ventilation section from the gas storage section. After the gas forms the cyclone, The movement speed is accelerated, and the gas will generate friction with the side walls on both sides of the ventilation section during the movement, so that the gas can filter the lubricating oil and impurities in the ventilation section. In addition, when the gas enters the containing gap through the upper connecting port, the gas can enter the inside of the filter element through the filter layer, and then be discharged from the outer shell from the exhaust port and the first air outlet. The lubricating oil and impurities are filtered out in this process. At the same time, the gas can also pass through the outer surface of the filter layer, and carry the lubricating oil and impurities attached to the outer surface of the filter layer downward through the lower connecting port back to the oil storage section. After entering the oil storage section, these gases will also move to the ventilation section with the gas entering from the second air inlet, repeating the above-mentioned filtering effect. This technical solution not only enhances the filtering effect of the oil-gas separation device to filter out lubricating oil and impurities, but also helps to extend the service life of the first filter element. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of the oil-gas separation device of the utility model;

[0016] Figure 2 It is a cross-sectional structural diagram of the first embodiment of the oil-gas separation device of the utility model;

[0017] Figure 3 It is a cross-sectional structural diagram of the second embodiment of the oil-gas separation device of the utility model. DETAILED DESCRIPTION

[0018] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially for illustrative purposes rather than for limiting the present invention.

[0019] In the description of the present application, the terms "first", "second", "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the structure referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present application.

[0020] The figure marks in the drawings of the specification include: outer shell 1, lower cylinder 101, partition 1011, second air inlet 1012, second oil return port 1013, first cavity 1014, second cavity 1015, ventilation section 10151, oil storage section 10152, upper cover 102, first air outlet 1021, first oil return port 1022, first oil return pipe 1023, flange 103, oil level display meter 104, first filter element 2, third air outlet 201, first filter layer 202, first bottom cover 203, second filter element 3, fourth air outlet 301, second filter layer 302, second bottom cover 303.

[0021] Embodiment 1

[0022] like Figure 1 and 2 As shown, the utility model proposes an oil-gas separation device, including an outer shell 1, the outer shell 1 includes a lower cylinder 101 and an upper cover 102, the lower cylinder 101 and the upper cover 102 are detachably connected, a second air inlet 1012 and a second oil return port 1013 are provided at the lower part of the lower cylinder 101, a first air outlet 1021 and a first oil return port 1022 are provided at the upper cover 102, a partition 1011 is provided in the lower cylinder 101, the partition 1011 divides the interior of the outer shell 1 into a first cavity 1014 and a second cavity 1015, the first cavity 1014 is located at the upper part of the outer shell 1, an upper connecting port and a lower connecting port are provided between the first cavity 1014 and the second cavity 1015, and the above-mentioned second air inlet 1012 and the second oil return port 1013 are both connected to the second cavity 1015, and the first air outlet 1021 and the first oil return port 1022 are both connected to the first cavity 1014. In addition, an oil level display gauge 104 for observing the amount of oil stored in the outer shell 1 and a negative pressure gauge (not shown in the figure) for observing the internal gas pressure of the outer shell 1 are also provided on the outer shell 1. The oil level display gauge 104 and the negative pressure gauge are both mature existing technologies and will not be repeated in this embodiment.

[0023] Specifically, the second cavity 1015 includes a lower oil storage section 10152 and an upper ventilation section 10151. The cross-section of the ventilation section 10151 is circular. The inner side of the circular ring of the ventilation section 10151 is a partition 1011 and a first cavity 1014. The second air inlet 1012 and the second oil return port 1013 are both connected to the oil storage section 10152, and the second air inlet 1012 is arranged above the second oil return port 1013. The first cavity 1014 is connected to the ventilation section 10151 through the upper connecting port, and is connected to the oil storage section 10152 through the lower connecting port. When filtering the gas, the gas carrying the lubricating oil enters the oil storage section 10152 from the second air inlet 1012, and then enters the ventilation section 10151 from the oil storage section 10152. The gas moves in the ventilation section 10151 to form an upward cyclone, and finally enters the first cavity 1014 from the upper connecting port at the top of the ventilation section 10151. In addition, the filtered lubricating oil and impurities will be gathered in the oil storage section 10152 due to gravity, and discharged from the outer shell 1 through the second oil return port 1013. The lubricating oil and impurities discharged through the second oil return port 1013 are circulated to the machine head after filtering and cooling.

[0024] like Figure 2 As shown, a filter element is provided in the first cavity 1014, and the filter element has an air filter layer for filtering gas and an exhaust port for discharging gas, the exhaust port is connected to the first air outlet 1021, and there is a accommodating gap between the air filter layer and the first cavity 1014; specifically, the above-mentioned filter element is a first filter element 2, the first filter element 2 is cup-shaped as a whole, and a third air outlet 201, i.e. the above-mentioned exhaust port, is provided at the upper end of the first filter element 2, the side wall of the first filter element 2 is an annular first filter layer 202, i.e. the above-mentioned air filter layer, and its bottom is a first bottom cover 203, the third air outlet 201 is connected to the first air outlet 1021, the first bottom cover 203 is sealed and connected to the first filter layer 202, and there is a first gap between the outer surface of the first filter element 2 and the first cavity 1014. When filtering the gas, the gas enters the first gap in the first cavity 1014 from the ventilation section 10151, then enters the interior of the first filter element 2 after being filtered by the first filter layer 202, and finally is discharged from the outer shell 1 through the third air outlet 201 and the first air outlet 1021. During the filtering process, the gas will carry the lubricating oil and impurities attached to the outer surface of the first filter layer 202 downward through the lower connecting port and return to the oil storage section 10152. After entering the oil storage section 10152, these gases will also move to the ventilation section 10151 along with the gas entering from the second air inlet 1012, repeating the above-mentioned filtering effect.

[0025] In addition, a first oil return pipe 1023 is provided on the side of the first oil return port 1022 facing the interior of the outer shell 1, and the first oil return pipe 1023 extends into the upper part of the oil storage section 10152 through the first gap and the lower connecting port, and one end of the first oil return pipe 1023 extending into the upper part of the oil storage section 10152 is located above the second air inlet 1012, and the lubricating oil located at the upper part of the oil storage section 10152 can be discharged from the outer shell 1 through the first oil return pipe 1023 and the first oil return port 1022, and the lubricating oil discharged through the first oil return port 1022 is directly circulated into the machine head, and impurities will be settled at the bottom of the oil storage section 10152 due to gravity. When the machine head lacks lubricating oil or there is too much lubricating oil in the oil storage section 10152, the lubricating oil in the upper part of the oil storage section 10152 can be circulated into the machine head through the first oil return pipe 1023 and the first oil return port 1022 on the basis of reducing the influence of impurities.

[0026] The working principle and beneficial effects of the utility model are as follows: the partition layer 1011 separates the lower cylinder 101 into a first cavity 1014 and a second cavity 1015, and forms a ventilation section 10151 on the upper part of the second cavity 1015, so that the gas forms an upward cyclone after entering the ventilation section 10151 from the gas storage section. After the gas forms the cyclone, its movement speed is accelerated, and the gas will generate friction with the side walls on both sides of the ventilation section 10151 during the movement, so that the gas can filter lubricating oil and impurities in the ventilation section 10151. In addition, when the gas enters the first gap through the upper connecting port, the gas can enter the first filter element 2 through the first filter layer 202. , and then discharged from the outer shell 1 from the third air outlet 201 and the first air outlet 1021, the lubricating oil and impurities are filtered out in this process, and the gas can also pass over the outer surface of the first filter layer 202, and carry the lubricating oil and impurities attached to the outer surface of the first filter layer 202 downward through the lower connecting port back to the oil storage section 10152, and after entering the oil storage section 10152, these gases will also move to the ventilation section 10151 with the gas entering from the second air inlet 1012, and repeat the above-mentioned filtering effect. This technical solution not only enhances the filtering effect of the oil-gas separation device to filter out lubricating oil and impurities, but also helps to extend the service life of the first filter element 2.

[0027] Embodiment 2

[0028] like Figure 1 and 3As shown, the difference between this embodiment and the first embodiment is that: a flange 103 is provided between the upper cover 102 and the lower cylinder 101, and the filter element is a plurality of second filter elements 3 arranged in the first cavity 1014. The second filter element 3 is installed in the first cavity 1014 through the flange 103. The provision of the flange 103 is conducive to simplifying the installation and maintenance operations of the second filter element 3; specifically, the specific number of the second filter elements 3 can be 3, 4, 5 or other numbers, the cross-sectional area of ​​the second filter element 3 is smaller than the cross-sectional area of ​​the first filter element 2, and the second filter element 3 is also cup-shaped as a whole. The upper end of the second filter element 3 is provided with a fourth air outlet 301, which is the air outlet of the filter element. The side wall of the second filter element 3 is an annular second filter layer 302, which is the air filter layer of the filter element, and its bottom is a second bottom cover 303. The fourth air outlets 301 of multiple second filter elements 3 are all connected to the first air outlet 1021. The second bottom cover 303 is sealed to the second filter layer 302. There is a second gap between the multiple second filter elements 3 and between the second filter element 3 and the second cavity 1015. The first oil return pipe 1023 described in Example 1 extends into the upper part of the oil storage section 10152 through the second gap and the lower connecting port. When filtering the gas, the gas enters the second gap in the first cavity 1014 from the ventilation section 10151, then enters the interior of the second filter element 3 after being filtered by the second filter layer 302, and finally is discharged from the outer shell 1 through the fourth air outlet 301 and the first air outlet 1021. In this filtering process, some gas will also carry the lubricating oil and impurities attached to the outer surface of the second filter layer 302 downward through the lower connecting port back to the oil storage section 10152; in addition, when the cross-sectional area of ​​the second filter element 3 arranged in the first cavity 1014 and the number of the second filter elements 3 reach a certain ratio, the area of ​​the second filter layer 302 in the first cavity 1014 can be increased, thereby further improving the filtering effect of the oil-gas separation device. Since the ratio between the cross-sectional area of ​​the second filter element 3 and the number of the second filter elements 3 is determined by the specific dimensions of each component during actual production, it will not be repeated in this embodiment.

[0029] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. An oil-gas separation device, characterized in that: It includes an outer shell, which is provided with a first air outlet for discharging gas, a second oil return port for discharging lubricating oil and impurities, and a second air inlet for inputting gas. A first cavity is provided in the outer shell, and a filter is provided in the first cavity. The filter has an air filter layer for filtering gas and an exhaust port for discharging gas. The exhaust port is connected to the first air outlet, and a containing gap is provided between the air filter layer and the first cavity. When filtering gas, the gas input from the second air inlet flows through the containing gap, the air filter layer, the exhaust port and the first air outlet in sequence and then is discharged from the outer shell.

2. The oil-gas separation device according to claim 1, characterized in that: A partition is provided in the outer shell, and the partition divides the interior of the outer shell into a first cavity and a second cavity. The first cavity is located in the upper part of the outer shell, and the second cavity includes a ventilation section located in the upper part of the outer shell. The cross-section of the ventilation section is circular, and the partition and the first cavity are arranged on the inner side of the circular ring of the ventilation section in sequence. An upper connecting port is provided between the first cavity and the ventilation section, and the gas input from the second air inlet enters the containing gap through the ventilation section.

3. The oil-gas separation device according to claim 2, characterized in that: The second cavity also includes an oil storage section located below the ventilation section and the first cavity, the second air inlet and the second oil return port are both connected to the oil storage section, a lower connecting port is provided between the first cavity and the oil storage section, the gas input from the second air inlet enters the ventilation section through the oil storage section, the gas in the accommodating gap can enter the oil storage section through the lower connecting port, and then enter the accommodating gap through the ventilation section.

4. The oil-gas separation device according to claim 1, characterized in that: The filter element is a first filter element, which is cup-shaped as a whole, and a third air outlet is provided at the upper end of the first filter element. The side wall of the first filter element is a first annular filter layer, and the bottom of the first filter element is a first bottom cover. The third air outlet is connected to the first air outlet, and the accommodating gap is the first gap between the outer surface of the first filter element and the first cavity.

5. The oil-gas separation device according to claim 1, characterized in that: A plurality of second filter elements are arranged in the first cavity, and the second filter element is cup-shaped as a whole, and a fourth air outlet is arranged at the upper end of the second filter element, and the side wall of the second filter element is an annular second filter layer, and the bottom of the second filter element is a second bottom cover, and the fourth air outlets of the plurality of second filter elements are all connected to the first air outlet, and the accommodating gap is the second gap between the plurality of second filter elements and between the second filter element and the second cavity.

6. The oil-gas separation device according to claim 5, characterized in that: The outer shell is also provided with a flange, and the second filter element is installed in the first cavity through the flange.

7. The oil-gas separation device according to claim 1, characterized in that: The outer shell comprises a lower cylinder and an upper cover, the lower cylinder and the upper cover are detachably connected, a second air inlet and a second oil return port are arranged at the lower part of the lower cylinder, and a first air outlet and a first oil return port are arranged on the upper cover.

8. The oil-gas separation device according to claim 7, characterized in that: A first oil return pipe is provided on the side of the first oil return port toward the inside of the outer shell. The first oil return pipe extends into the lower part of the outer shell through the first cavity. The lubricating oil in the lower part of the outer shell can be discharged from the outer shell through the first oil return pipe and the first oil return port.

9. The oil-gas separation device according to claim 8, characterized in that: The second oil return port is arranged at the bottom of the outer shell, the second air inlet is arranged above the second oil return port, and one end of the first oil return pipe extending into the lower part of the outer shell is located above the second air inlet.

Images