JP2002266621A - Oil separator structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve performance of an oil separator structure removing oil mist from a gas stream including the oil mist such as blow-by gas. SOLUTION: The structure for a blow-by gas filter (the oil separator) 40 separating an oil portion from the gas fluid including mist like oil is provided with a hollow case body 41 with an opening in an upper part, a lid 42 closing the opening of the case body 41, and a filter 43 housed inside the case body 41. An inlet 44 of the gas fluid is provided in a lower side face of the case body 41, an outlet 45 of the gas fluid is provided on the lid 42, and an outflow outlet 46 of the separated oil portion is provided in a bottom of the case body 41.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil separator structure for separating mist-like oil contained in a gas fluid such as blow-by gas, and more particularly, to an oil separator structure suitable for a gas engine of a gas heat pump type air conditioner. The present invention relates to an oil separator structure.

[0002]

2. Description of the Related Art An air conditioner which performs cooling and heating using a heat pump is provided with a refrigerant circuit including components such as an indoor heat exchanger, a compressor, an outdoor heat exchanger, and an expansion valve. Cooling and heating of the room is realized by exchanging heat in the indoor heat exchanger and the outdoor heat exchanger, respectively, while the refrigerant passes through this circuit. Further, the refrigerant circuit may be provided with a refrigerant heater for directly heating the refrigerant itself, instead of relying solely on receiving the heat of the refrigerant by the outdoor heat exchanger (during the heating operation). .

In recent years, as a power source for a compressor in the above-described refrigerant circuit, a type using a gas engine instead of a commonly used electric motor has been developed. An air conditioner using this gas engine is generally called a gas heat pump type air conditioner (hereinafter abbreviated as GHP). According to this GHP, a relatively inexpensive gas can be used as fuel, so that the running cost does not increase as in an air conditioner (hereinafter abbreviated as EHP) equipped with a compressor using an electric motor. Costs can be reduced.

Further, in the GHP, for example, during heating operation, if the heat of the high-temperature exhaust gas discharged from the gas engine is used as a heating source for the refrigerant, it is possible to obtain an excellent heating effect, Use efficiency can be improved. In addition, if such a mechanism is introduced, it is not necessary to specially install devices such as the above-described refrigerant heater in the refrigerant circuit.

[0005] In addition, in the GHP, a frost removing operation of the outdoor heat exchanger required for a heating operation, that is, a so-called defrost operation, can also be performed by using exhaust heat of the engine. Generally, in the defrost operation in the EHP, the heating operation is stopped, the cooling operation is temporarily performed, and the outdoor heat exchanger is defrosted. In this case, since the cool air is blown into the room, the comfort of the room environment is impaired. In the GHP, the continuous heating operation becomes possible due to the above-described circumstances, and there is no occurrence of a problem that is a concern in the EHP.

[0006]

Although the GHP has many advantages as described above, the following problems have been pointed out with respect to the conventional GHP.

As described above, the GHP uses a gas engine as a drive source of the compressor. In such a gas engine, the oil content in the blow-by gas may cause a problem. . The blow-by gas is gas that leaks from the combustion chamber to the crankcase through the gap between the piston ring and the cylinder, and is usually returned from the crankcase to the engine intake system and sent to the combustion chamber again.

Since the above-mentioned blow-by gas contains mist-like lubricating oil (hereinafter referred to as oil mist), a blow-by gas filter is provided at an appropriate position in a flow path of the blow-by gas (hereinafter referred to as blow-by gas system). Thus, an apparatus (oil separator) for collecting and removing oil mist is provided. 9 and 10 are views showing an oil separator used as a conventional blow-by gas filter. In the figures, reference numeral 140 denotes an oil separator, 141 denotes a case main body, 142 denotes a lid (lid member), 143 denotes a filter, 144 Is the gas fluid inlet, 1
45 is a gas fluid outlet, and 146 is an oil mist outlet port collected by the filter 143.

In such an oil separator 140,
The blow-by gas flowing from the inlet 144 communicating with the crankcase of the gas engine passes through the filter 143,
The gas is drawn from the outlet 145 into the intake system of the gas engine. Oil mist in the blow-by gas is
3 and is dropped off at the bottom of the case body 141 and returned from the outlet 146 to the oil pan of the gas engine. For this reason, the separation efficiency of the oil mist is secured by making the vertical height of the filter 143 serving as the flow path of the blow-by gas as large as possible, but the filter 143 needs to be replaced as appropriate according to the operation period. Therefore, a structure in which the lid 142 can be removed from the case body 141 is adopted. Considering the workability when replacing the filter 143, the lid 14
The mounting position 2 is a side surface where the area of the opening can be maximized.

However, in the oil separator 140 having the above-described structure in which the lid 142 is disposed on the side surface of the case body 141, the oil that falls to the bottom of the case body 141 leaks out of the gap between the case body 141 and the lid 142 due to gravity. Is concerned. In particular, when separating and removing the oil mist of the blow-by gas, the outlet 146
Is located on the positive pressure side where the pressure is higher than the outside of the case at atmospheric pressure, and the possibility of leakage from the gap of the joint increases due to this pressure.
In order to solve such an oil leak (first problem),
Although it is conceivable to improve the sealing performance between the case body 141 and the lid 142, it is disadvantageous in terms of cost in order to obtain good sealing performance, for example, the sealing structure of the joint becomes complicated. Further, since the case body 141 and the lid 142 are molded parts made of resin, if the structure becomes complicated, a problem arises in moldability.

Further, in the conventional oil separator 140, since the filter 143 is made of non-woven fabric or the like which is inferior in shape-retaining property, the gap S between the side wall and the lid 142 of the case body 141 in the housed state (FIG. 10) easily occurs. The presence of such a gap S serves as a flow path through which the blow-by gas including oil mist flows to the outlet 145 almost without passing through the filter 143, and thus causes a reduction in the oil mist separation efficiency in the oil separator 140. For this reason, it is desired that the blow-by gas surely passes through the filter 143 to improve the oil mist separation efficiency (second problem).

The present invention has been made in view of the above circumstances, and an object of the present invention is to improve the performance of an oil separator structure for removing oil mist from a gas fluid containing oil mist such as blow-by gas. .
In particular, (1) to provide an inexpensive oil separator structure that can prevent the leakage of removed oil, and (2) to provide an oil separator structure with improved oil mist separation efficiency of gas fluid containing oil mist. The purpose is.

[0013]

The present invention employs the following means in order to solve the above-mentioned problems. The oil separator structure according to claim 1, wherein the oil separator structure separates an oil component from a gas fluid containing mist-like oil, and has a hollow case main body having an open upper part, and a lid for closing the opening of the case main body. A member and a filter housed in the case body, an inlet for the gas fluid on a lower side surface of the case body, an outlet for the gas fluid on the lid member, and an outlet for separated oil. It is characterized by being provided at the bottom of the case body, respectively.

According to such an oil separator structure, since the upper opening of the case main body is closed by the lid member, the joint portion with the lid member is eliminated at the bottom of the case main body from which the separated oil falls and flows out. It is possible to prevent oil leakage with a simple configuration.

According to a second aspect of the present invention, there is provided an oil separator structure comprising: a hollow case main body having an upper opening; a lid member for closing the opening of the case main body; and a filter housed in the case main body. An inlet for fluid is provided on the lower side surface of the case body, an outlet for gas fluid is provided on the lid member, and an outlet for separated oil is provided at the bottom of the case body, and the mist-like oil flowing from the inlet is provided. An oil separator structure in which an oil component is separated by passing a gas fluid containing the gas through the filter, and a guide means for guiding a flow of the gas fluid from the inlet to the outlet toward the center of the filter is provided. It is a feature.

According to such an oil separator structure, the flow of the gas fluid is guided to the center side of the filter by the action of the guide means. Therefore, even if there is a gap between the outer peripheral surface of the filter and the wall surface of the case body. In addition, the efficiency of separating oil mist can be improved.

In the oil separator structure according to the present invention, preferably, the guide means is a tubular member protruding from a lower surface of the lid member, or protruding from an inner wall above the inlet of the case body. There is a plate-shaped ring member.

According to a fifth aspect of the present invention, there is provided an oil separator structure comprising: a hollow case main body having an open upper part; a lid member for closing the opening of the case main body; and a filter housed in the case main body. An inlet for fluid is provided on the lower side surface of the case body, an outlet for gas fluid is provided on the lid member, and an outlet for separated oil is provided at the bottom of the case body, and the mist-like oil flowing from the inlet is provided. An oil separator structure in which an oil component is separated when a gas fluid containing the oil passes through the filter, wherein the case body has a large-diameter upper part for storing the filter, and a small-diameter lower part provided with the inlet and the outlet. And a configuration in which the flow of the gas fluid from the inlet to the outlet is guided toward the center of the filter at the connection surface between the large diameter portion and the small diameter portion. It is an feature.

According to such an oil separator structure, the connecting surface between the large-diameter portion and the small-diameter portion acts as a guide means to guide the flow of the gas fluid toward the center of the filter.
Even if there is a gap between the outer peripheral surface of the filter and the wall surface of the case body and the lid member, the efficiency of separating oil mist can be improved.

In the oil separator structure according to any one of the first to fifth aspects, an inlet for the gas fluid and an outlet for the separated oil are open to a positive pressure region, and the outlet for the gas fluid is a negative pressure. Wherein the gas fluid is blow-by gas of an internal combustion engine, the positive pressure region communicates with a crankcase of the internal combustion engine, and the negative pressure region is open to the internal combustion engine. It communicates with the intake system of the engine.

According to such an oil separator structure, since the joint between the case body and the lid member is provided in the negative pressure area, the pressure outside the case, which is the atmospheric pressure, is higher than that in the case, and the oil pressure is further increased. The structure is less likely to leak. In the oil separator structure for removing oil mist from blow-by gas of an internal combustion engine, a negative pressure region can be easily formed because the outlet is connected to the intake system.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of an oil separator structure according to the present invention will be described below with reference to the drawings. First, a configuration example of a gas heat pump type air conditioner will be described as an application example of the oil separator structure according to the present invention. The gas heat pump type air conditioner (GHP) is mainly composed of an indoor unit 1 and an outdoor unit 10 as shown in FIG. In the indoor unit 1,
An indoor heat exchanger is provided for evaporating and evaporating a low-temperature and low-pressure liquid refrigerant to remove heat from indoor air during a cooling operation, and for condensing and liquefying a high-temperature and high-pressure gas refrigerant to heat indoor air during a heating operation. A low-temperature and low-pressure liquid refrigerant (during cooling operation) or a high-temperature and high-pressure gas refrigerant (during heating operation) is supplied from the outdoor unit 10 to the indoor heat exchanger through the refrigerant pipe 2. The air in the room for cooling and heating is sucked by the operation of an indoor unit fan (not shown), passes through the indoor heat exchanger, exchanges heat with the refrigerant, and is blown out into the room.

The outdoor unit 10 includes a refrigerant circuit section including a compressor, an outdoor heat exchanger, an expansion valve, a four-way valve, etc., a gas engine for driving the compressor, an electric motor, and equipment associated therewith. And a gas engine unit. The outdoor unit 10 includes a lower machine room 11.
The upper and lower heat exchange chambers 12 are divided by a partition plate (not shown), and the main equipment such as a gas engine 14, a compressor 15, and a controller (control unit) 16 is installed in one machine room 11. In the other heat exchange room 12, main devices such as an outdoor heat exchanger 30 and an outdoor unit fan 31 are installed. The partition plate is provided with a ventilation port, and the machine room 1
1 and the heat exchange chamber 12 are in communication.

FIG. 8 is a view showing a blow-by gas system BG of the gas engine 14.
4a, crankshaft 14b, piston 14c, piston ring 14d, cylinder 14e, crankcase 1
4f, a combustion chamber 14g, a cylinder head cover 14h, and an intake manifold 14i. The blow-by gas is supplied from the combustion chamber 14 g to the piston ring 14.
d through the gap between the cylinder 14e and the crankcase 1
The gas leaked to 4f contains unburned fuel gas, mist (mist) lubricating oil, exhaust gas, and the like.

The flow of the blow-by gas is indicated by an arrow in FIG. 8, and the blow-by gas containing oil mist leaked to the crankcase 14f (indicated by a broken-line arrow).
Is guided to the cylinder head cover 14h through the internal flow path BG1 of the gas engine 14. The cylinder head cover 14h is connected to the blow-by gas filter 40 by a blow-by outflow passage BG2. Therefore, the blow-by gas is guided from the cylinder head cover 14h to the blow-by gas filter 40. The oil removed by the blow-by gas filter 40 is returned to the oil pan 14a through the oil return hose BG3 by its own weight (indicated by a two-dot chain line arrow), and merges with the lubricating oil in the oil pan 14a. Be reused.

The blow-by gas from which oil mist has been removed by the blow-by gas filter 40 (indicated by a dashed-dotted arrow) is sucked by the blow-by return flow path BG8 toward an appropriate position in the engine intake system, for example, toward the intake manifold 14i. . The blow-by gas guided to the intake manifold 14i in this manner is merged with newly sucked air (fresh air) indicated by a solid line arrow, and then returned to the combustion chamber 14g again and burned together with the fuel gas. You.

The blow-by gas system B constructed as described above
In G, the first embodiment of the blow-by gas filter 40 provided as an oil separator is configured as described below. As shown in FIG. 1, the blow-by gas filter 40 includes a case main body 41 having an open upper portion of a hollow container, a lid 42 provided as a lid member for closing the upper opening of the case main body 41, and a case main body 4.
1 and a filter 43 made of a non-woven fabric or the like stored in the apparatus 1. In the drawing, reference numeral 44 denotes an inlet of the blow-by gas containing oil mist, 45 denotes an outlet of the blow-by gas from which the oil mist has been removed, and 46 denotes an outlet of the removed oil.

The illustrated case main body 1 is a resin molded part having a substantially hollow rectangular parallelepiped shape, and an upper opening is provided by removing an upper surface thereof. Around the upper opening,
A flange portion 41a is provided. As shown in FIG. 2, the lid 42 is a plate-shaped member of a resin molded component having a shape substantially matching the shape of the flange portion 41 a in a plan view. The lid 42 is closed by closing the opening with the lid 42, and then fixed. The means 47 is integrated with the case body 41. As the fixing means 47 used here, one that can be repeatedly attached and detached by the lid 42, such as a bolt and a nut, is selected. The flange 4
As shown in FIG. 3, an O-ring 48 serving as a seal member is provided over the entire circumference of the member 1a.

The case body 41 is provided with an inlet 44 for a gas fluid for introducing a blow-by gas containing oil mist into the case, and an outlet 46 for discharging the oil separated and removed from the blow-by gas. ing. The inlet 44 is provided to be open at the lower side surface of the case body 41, and the crankcase 14 of the gas engine 14 is provided by a pipe.
f. The outflow port 46 is opened at the bottom of the case body 41 so as to collect and discharge the oil dropped by gravity, and communicates with the oil pan 14a through a pipe. Further, the inlet 44 and the outlet 46 open to a positive pressure region P <b> 1 formed below the filter 43. Since this positive pressure region P1 communicates with the crankcase 14f,
This is a region where the internal pressure is higher than the outside of the case where the atmospheric pressure P is reached.

The lid 42 has a gas fluid outlet 4 for discharging blow-by gas from which oil mist has been removed to the outside of the case.
5 are provided. The outlet 45 is connected to an intake system of the gas engine 14 such as the intake manifold 14 by a pipe.
Since it is in communication with i, the pressure inside the case is open to a negative pressure region P2 lower than the atmospheric pressure P.

With the blow-by gas filter 40 having such a structure, the oil separated and removed from the blow-by gas in the process of passing through the filter 43 falls to the bottom of the case body 41 by gravity, and flows out of the oil outlet 46 through the oil outlet 46. Bread 1
4a. In such a flow path of the blow-by gas and the oil, there is no joint between the case body 41 and the lid 42 near the bottom where the oil falls and flows out of the case. For this reason, it is possible to prevent oil from flowing out of the joint due to gravity, which is a concern in the conventional structure.
In the above-described configuration, the case body 41 and the lid 42
Is located in the negative pressure region P2 above the filter 43, and in such a negative pressure region, the external pressure is higher than in the case, so that even if oil exists, it is difficult for oil to leak out. .

Next, a second embodiment of the above-described blow-by gas filter will be described with reference to FIG. The blow-by gas filter 40A is different from the first embodiment shown in FIG. 1 in that a guide member for guiding the flow of the gas fluid to the center side of the filter 43 is additionally provided. In this embodiment, a plate-shaped ring member 50 is integrally provided on the inner wall of the case body 41 as a guide member. The plate-shaped ring member 50 is a donut-shaped member provided with a gas fluid flow path in the center, and is located slightly above the inlet 44 for introducing blow-by gas. In the illustrated example, it can be used as a member on which the lower end surface of the filter 43 is placed.

By providing such a plate-like ring member 50, the flow path on the inner wall side of the case main body 41 is closed, so that the blow-by gas containing oil mist introduced from the inlet 44 passes through the center of the filter 43. It is led to the side and rises. Therefore, all or almost all of the blow-by gas passes through the filter 43 and flows out of the outlet,
Oil mist can be reliably separated and removed.

That is, the filter 43 and the case body 41
Even if the gap S is formed between the blow-by gas and the inner wall surface, the flow of the blow-by gas is guided to the center side of the filter 43 to prevent or suppress the passage of the gap S, and the blow-by gas flowing out of the outlet 45 without removing the oil mist is removed. The proportion of gas can be greatly reduced. Therefore, the separation efficiency of the oil component in the blow-by gas filter 40A can be improved. If the diameter of the gas fluid passage provided in the center of the plate-shaped ring member 50 is too large, the amount of blow-by gas passing through the gap S increases, and if it is too small, the separation efficiency improves, but the pressure loss also increases. Therefore, an optimum value according to various conditions may be appropriately selected.

Next, a third embodiment of the above-described blow-by gas filter will be described with reference to FIG. This blow-by gas filter 40B is a modified example of the second embodiment shown in FIG. 4, and has a large-diameter portion 41A constituting a case main body 41 as a guide member for guiding the flow of a gas fluid to the center side of the filter 43. The connecting portion 51 with the small diameter portion 41B is used. That is, in this embodiment, the case body 4
1 has a two-stage structure, and a substantially horizontal portion connecting between the small diameter portion 41B located at the lower portion and the large diameter portion 41A located at the upper portion is used as a guide member. Correspond to the plate-shaped ring member 50 provided integrally with the inner wall of the case body 41, and the same operation and effect can be obtained. Note that the connection portion 51 in this case can also be used as a member on which the lower end surface of the filter 43 is placed.

Since the connection portion 51 is provided as the case main body 41 having such a two-stage structure, the blow-by gas containing oil mist introduced from the inlet 44 is guided toward the center of the filter 43 and rises. That is, since the flow path along the inner wall of the case body 41 is closed by the connection portion 51, the entire amount or almost the entire amount of the blow-by gas is
3, and flows out from the outlet, so that the oil mist can be reliably separated and removed.

That is, the filter 43 and the case body 41
Even if a gap S is formed between the blow-by gas and the inner wall surface, the flow of the blow-by gas is guided to the center side of the filter 43 to prevent or suppress the passage of the gap S, and the blow-by gas flowing out of the outlet 45 without removing the oil mist. The proportion of gas can be greatly reduced. Therefore, the oil separation efficiency in the blow-by gas filter 40B can be improved. If the diameter of the gas fluid flow path (the diameter of the small diameter portion 41B) provided at the center of the connection portion 51 is too large, the amount of blow-by gas passing through the gap S increases, and if it is too small, the separation efficiency improves. On the other hand, pressure loss also increases,
An optimum value according to various conditions may be appropriately selected.

Next, a fourth embodiment of the above-described blow-by gas filter will be described with reference to FIG. The blow-by gas filter 40C differs from the second embodiment shown in FIG. 4 in the guide member for guiding the flow of the gas fluid to the center side of the filter 43. The guide member of this embodiment is provided by projecting a downward cylindrical member 52 on the lower surface of the lid 42. The tubular member 52 has a substantially similar cross-sectional shape smaller than the cross-sectional shape of the case main body 41, and is provided so as to provide an enclosure above the filter 43. In addition, it is preferable that the lower end of the cylindrical member 52 be provided to a position where the lower end is in close contact with the upper surface of the filter 43.

By providing such a tubular member 52,
The blow-by gas that flows through the gap S formed along the inner wall of the case body 41, that is, rises by bypassing the filter 43, has a closed flow path from the negative pressure region P2 to the outlet 45. For this reason, the blow-by gas containing the oil mist introduced from the inlet 44 is guided to the center of the filter 43 communicating from the negative pressure region P2 to the outlet 45 and rises. Accordingly, the entire amount or almost the entire amount of the blow-by gas passes through the filter 43 and flows out from the outlet 45, so that the oil mist can be reliably separated and removed.

That is, the filter 43 and the case body 41
Even if the gap S is formed between the blow-by gas and the inner wall surface, the flow of the blow-by gas is guided to the center side of the filter 43 to prevent or suppress the passage of the gap S, and the blow-by gas flowing out of the outlet 45 without removing the oil mist is removed. The proportion of gas can be greatly reduced. Therefore, the separation efficiency of oil in the blow-by gas filter 40C can be improved.

As described above, according to the blow-by gas filter (oil separator) structure of the present invention, since the lid 42 provided for replacing the filter 43 is disposed above the case body 41, the lid 43 is separated by the filter 43.・
It is possible to prevent the removed oil from leaking from the joint. Moreover, since the sealing structure at the joint does not become particularly complicated, it can be manufactured at low cost without any problem of resin molding. In particular, when applied to a gas fluid such as blow-by gas, the inlet 44 side becomes the positive pressure area P1 and the outlet 45 side becomes the negative pressure area P2. Can be prevented from leaking.

Further, the plate-like ring member 50, the connecting portion 51
If the guide member such as the tubular member 52 is provided, the problem that the blow-by gas containing the oil mist passes through the gap S and bypasses the filter 43 and flows out from the outlet 45 can be solved. That is, since the entire or substantially the entire amount of the blow-by gas passes through the filter 43, it is possible to reliably separate and remove the oil mist, so that the oil separation efficiency as the oil separator can be improved. In other words, even when a gap S is formed between the filter 43 and the wall surface of the case main body 41, the amount of gas fluid passing through the gap S can be greatly reduced, so that the oil separation efficiency caused by this can be reduced. Can be prevented from decreasing.

In the above description, the gas fluid has been described as the blow-by gas of the gas engine 14 in the GHP. However, the oil separator structure of the present invention is not limited to this. It is also applicable as an oil separator. Further, the configuration of the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist of the present invention. It should be noted that the structure for preventing oil leakage of the first embodiment described above and the structure for improving the separation efficiency of the second to fourth embodiments described above achieve the effect even when each is used alone. However, by using both of them, the performance of the oil separator can be further improved.

[0044]

According to the oil separator structure of the present invention, the oil separated and removed from the gas fluid containing the oil mist can be reliably discharged without leaking from the joint, and the structure is simple and inexpensive. Can be manufactured. Further, since the guide member is provided, the gas fluid flowing bypassing the filter can be significantly reduced, so that the efficiency of separating oil mist can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of an oil separator structure according to the present invention.

FIG. 2 is a plan view of the oil separator structure shown in FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view showing a second embodiment of the oil separator structure according to the present invention.

FIG. 5 is a sectional view showing a third embodiment of the oil separator structure according to the present invention.

FIG. 6 is a sectional view showing a fourth embodiment of the oil separator structure according to the present invention.

FIG. 7 is a diagram showing a configuration example of a gas heat pump type air conditioner as an application example of the oil separator structure according to the present invention.

8 is a view showing a blow-by gas system of a gas engine in the gas heat pump type air conditioner shown in FIG.

FIG. 9 is a sectional view showing a conventional oil separator structure.

FIG. 10 is a sectional view taken along the line BB of FIG. 9;

[Explanation of symbols]

40, 40A, 40B, 40C Blow-by gas filter (oil separator) 41 case body 42 lid (lid member) 43 filter 44 inlet 45 outlet 46 outflow outlet 50 plate-shaped ring member (guide member) 51 connection part (guide member) 52 cylinder P1 Positive pressure area P2 Negative pressure area S Clearance

Claims (7)

[Claims] 1. An oil separator structure for separating an oil component from a gas fluid containing mist-like oil, comprising: a hollow case main body having an upper opening; a lid member for closing an opening of the case main body; And a filter housed therein, wherein an inlet for the gas fluid is provided on a lower side surface of the case body, and an outlet for the gas fluid is provided on the lid member.
An oil separator structure, wherein an outlet for the separated oil is provided at the bottom of the case body. 2. A hollow case main body having an open upper part,
A cover member for closing an opening of the case body; and a filter housed in the case body, wherein an inlet for gas fluid is separated from a lower side surface of the case body, and an outlet for gas fluid is separated from the lid member. An oil separator structure is provided in which an oil outlet is provided at the bottom of the case body, and an oil component is separated by passing a gas fluid containing mist-like oil flowing from the inlet through the filter, An oil separator structure, comprising: a guide for guiding a flow of a gas fluid from the inlet to the outlet toward a center of the filter. 3. The guide means according to claim 2, wherein said guide means is a cylindrical member protruding from a lower surface of said lid member.
The oil separator structure according to the above. 4. The oil separator structure according to claim 2, wherein said guide means is a plate-shaped ring member protruding from said upper inner wall of said inlet of said case body. 5. A hollow case body having an open upper part,
A cover member for closing an opening of the case body; and a filter housed in the case body, wherein an inlet for gas fluid is separated from a lower side surface of the case body, and an outlet for gas fluid is separated from the lid member. An oil separator structure is provided in which an oil outlet is provided at the bottom of the case body, and an oil component is separated by passing a gas fluid containing mist-like oil flowing from the inlet through the filter, The case main body includes a large-diameter upper portion for storing the filter, and a small-diameter lower portion provided with the inlet and the outflow outlet, and goes from the inlet to the outlet at a connection surface between the large-diameter portion and the small-diameter portion. An oil separator structure, wherein a flow of a gas fluid is guided to a center side of the filter. 6. The gas fluid inlet and the separated oil outlet and outlet are open to a positive pressure area, and the gas fluid outlet is open to a negative pressure area.
6. The oil separator structure according to any one of claims 1 to 5. 7. The gas fluid is blow-by gas of an internal combustion engine, and the positive pressure region communicates with a crankcase of the internal combustion engine, and the negative pressure region communicates with an intake system of the internal combustion engine. The oil separator structure according to claim 6, wherein: