Oil-gas separator pressure control valve structure based on matching part structure

Abstract

The utility model discloses an oil-gas separator pressure control valve structure based on a matching part structure. The pressure control valve structure comprises an air outlet cylinder, an air outlet cover, a plunger and a spring. An air inlet channel extending in the axial direction is formed in the center of the air outlet cylinder; an inner conical surface is processed at the tail end of the air inlet channel; the air outlet cover is provided with a plunger hole, an air outlet channel and a circumferential vent hole; the plunger hole is communicated with the atmosphere; communicated annular spaces are formed between the inner side wall of the air outlet cylinder and the outer side wall of the air inlet channel as well as between the inner side wall of the air outlet cover and the outer side wall of the plunger hole; the circumferential vent holes are used for communicating the annular space with the air outlet channel; the plunger and the plunger hole are in matching part fit, and the cylinder can do reciprocating rectilinear motion in the plunger hole; and the spring is propped between the conical body and the air outlet cylinder. According to the pressure control valve structure, the turning amplitude and frequency of gas in the pressure control valve structure can be reduced, the gas flow resistance at the gas outlet of the oil-gas separator is effectively reduced, and self-lubrication can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to an oil-gas separator pressure control valve structure based on a coupled structure. Background Art

[0002] During the operation of the engine, the gas that blows into the crankcase from the combustion chamber will cause serious damage to the engine. Therefore, the engine needs to use an oil-gas separator to discharge the crankcase blowby gas and separate and recover the oil in the blowby gas. Among various types of oil-gas separators, active centrifugal oil-gas separators that use the principle of rotary centrifuge have gradually been widely used because of their high oil-gas separation efficiency for crankcase blowby gas and the advantages of being maintenance-free.

[0003] Since the active centrifugal oil-gas separator actively extracts blowby gas from the crankcase, if it is not controlled, the pressure in the crankcase may be sucked to an extremely low state and affect the normal operation of the engine. Therefore, active centrifugal oil-gas separators are equipped with a pressure control system to ensure that the crankcase pressure is within the normal range.

[0004] At present, most of the pressure control systems of oil-gas separators adopt rubber diaphragm structures, such as the pressure control valves used in the patents with authorization announcement numbers CN207893169U and CN217632616U. However, the disadvantage of this pressure control system is that the circumference of the rubber diaphragm needs to be completely fixed, so that the gas outlet must be installed on one side, resulting in the gas passing through the outlet of the oil-gas separator. It needs to go through two or even multiple large turns, which increases the local resistance of gas flow. Utility Model Content

[0005] The utility model provides an oil-gas separator pressure control valve structure based on a coupled structure, which can reduce the turning amplitude and number of gas in the pressure control valve structure, effectively reduce the gas flow resistance at the oil-gas separator outlet, and realize self-lubrication.

[0006] The utility model adopts the following specific technical solutions:

[0007] A pressure control valve structure of an oil-gas separator based on a coupled structure, the pressure control valve structure comprising an air outlet tube, an air outlet cover, a plunger and a spring;

[0008] The air outlet tube is arranged opposite to the air outlet cover and is fixedly connected;

[0009] The center of the air outlet cylinder is provided with an air inlet extending along its axial direction; the air inlet is used to communicate with the inside of the oil-gas separator, and an inner conical surface is processed at the end of the air inlet;

[0010] The air outlet cover is provided with a plunger hole, an air outlet channel and a circumferential air vent; the plunger hole and the air outlet channel both extend along the axial direction of the air outlet cover and are arranged at intervals, the plunger hole is arranged at the center of one end of the air outlet cover facing the air outlet cylinder, and the bottom end is connected to the atmosphere; the air outlet channel is arranged at the center of the other end of the air outlet cover;

[0011] A communicating annular space is formed between the inner side wall of the gas outlet cylinder and the outer side wall of the gas inlet passage, and between the inner side wall of the gas outlet cover and the outer side wall of the plunger hole;

[0012] The circumferential vent holes are distributed along the circumference of the air outlet cover and are used to connect the annular space with the air outlet;

[0013] The cross section of the plunger is in an "umbrella" shape, comprising a cylindrical body and a conical body that are fixedly connected; the plunger and the plunger hole are matched as a pair, and the cylindrical body can perform reciprocating linear motion in the plunger hole;

[0014] The spring is abutted between the cone and the punching bag.

[0015] Furthermore, the air outlet cover is also provided with an atmosphere communication hole;

[0016] The inner end of the atmosphere communication hole is communicated with the plunger hole, and the outer end is communicated with the atmosphere.

[0017] Furthermore, the atmosphere communication hole is composed of an axial hole extending in the axial direction and a radial hole extending in the radial direction;

[0018] The air inlet, the air outlet, the plunger hole and the axial hole are all coaxially arranged.

[0019] Furthermore, the outlet tube has spring fixing ribs evenly distributed on the outer side wall of the air inlet;

[0020] The spring is a cylindrical compression spring with two ends tightly connected, one end of which is sleeved on the outer peripheral side of the spring fixing rib, and the other end of which is sleeved on the outer peripheral surface of the cone.

[0021] Furthermore, the slope of the outer conical surface of the cone is consistent with the slope of the inner conical surface.

[0022] Furthermore, the length of the cylinder is smaller than the depth of the plunger hole.

[0023] Furthermore, the air outlet tube is connected to the air outlet cover via threads.

[0024] Furthermore, the circumferential vent holes are evenly distributed along the circumference of the air outlet cover.

[0025] Furthermore, it also includes a sealing ring;

[0026] The sealing ring is installed between the air outlet tube and the air outlet cover, and is used for sealing the connection between the air outlet tube and the air outlet cover.

[0027] Furthermore, the sealing ring is an O-type rubber ring.

[0028] Beneficial effects:

[0029] 1. The pressure control valve structure of the utility model has an air outlet tube and an air outlet cover arranged relatively to each other and adopts a coupled structure, so that the air inlet and the air outlet are coaxially arranged, which reduces the turning amplitude and number of the gas in the pressure control valve structure, and is conducive to reducing the gas flow resistance.

[0030] 2. Since there is still a small amount of engine oil in the gas after purification by the oil-gas separator, when the oil and gas pass through the pressure control valve structure, the small amount of engine oil it carries will adhere to the inner wall, which helps lubricate the plunger. Therefore, the residual engine oil carried in the gas passing through the oil-gas separator can achieve self-lubrication of the pressure control valve structure without the need for additional lubrication.

[0031] 3. The pressure control valve structure of the utility model uses the movement principle of the plunger under the elastic force of the spring, the internal pressure of the oil-gas separator and the pressure difference of the atmosphere to adjust the crankcase pressure of the engine to prevent the crankcase pressure from being too low. At the same time, the pressure value set by the pressure control valve structure can be changed by adjusting the stiffness or preload of the spring only, while the other structures remain unchanged. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the oil-gas separator pressure control valve structure of the utility model.

[0033] Figure 2 It is a schematic diagram of the structure of the punching bag of the utility model.

[0034] Figure 3 It is a schematic diagram of the structure of the air outlet cover of the utility model.

[0035] Figure 4 This is a schematic diagram of another structure of an air outlet cover with a circumferential circular groove according to the utility model.

[0036] Among them, 1-air outlet, 2-air outlet cover, 3-plunger, 4-spring, 5-O-type rubber ring, 1-1-air inlet, 1-2-spring fixing rib, 2-1-air outlet, 2-2-circumferential vent, 2-3-plunger hole, 2-4-atmosphere connecting hole, 2-5-arc groove. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] Embodiment 1

[0039] This embodiment provides an oil-gas separator pressure control valve structure based on a coupled structure, such as Figure 1 As shown, the pressure control valve structure includes an air outlet tube 1, an air outlet cover 2, a plunger 3, a spring 4 and a sealing ring;

[0040] like Figure 2 As shown, the air outlet 1 is provided with an air inlet 1-1 located in the center and extending in the axial direction, and a plurality of spring fixing ribs 1-2 are evenly distributed on the outer wall of the air inlet 1-1. The air inlet 1-1 is connected to both ends of the air outlet 1, the right end is connected to the inside of the oil-gas separator, and the left end is opposite to the air outlet cover 2. The end of the air inlet 1-1 is processed with an inner cone surface, and the spring fixing ribs 1-2 are arranged on the outer ring of the air inlet 1-1, and are evenly distributed in the circumferential direction. The air outlet 1 can be directly processed on the outer shell of the oil-gas separator, and can also be installed on the outer shell of the oil-gas separator by threaded connection or other connection methods.

[0041] like Figure 3 As shown, the air outlet cover 2 and the air outlet cylinder 1 are arranged opposite to each other in the axial direction, and the outer peripheral surfaces of the air outlet cover 2 and the air outlet cylinder 1 can be cylindrical surfaces; the air outlet cover 2 is provided with an air outlet 2-1, a circumferential air vent 2-2, a plunger hole 2-3 and an atmosphere communication hole 2-4. The air outlet cover 2 and the air outlet cylinder 1 can be connected by threads, and a sealing ring is placed at the threaded connection between the air outlet cover 2 and the air outlet cylinder 1. The sealing ring can be an O-type rubber ring 5, which functions to seal. The air outlet 2-1 is located at the center of one end of the air outlet cover 2 away from the air outlet cylinder 1, and is connected to the circumferential air vent 2-2; the circumferential air vent 2-2 includes a plurality of circumferentially uniformly distributed through holes. The plunger hole 2-3 is arranged at the inner center position of the end of the air outlet cover 2 facing the air outlet cylinder, and the atmosphere communication hole 2-4 is composed of a radial hole and an axial hole connected, and the atmosphere communication hole 2-4 connects the bottom end of the plunger hole 2-3 with the external atmosphere.

[0042] like Figure 1 As shown, a communicating annular space is formed between the inner wall of the air outlet cylinder 1 and the outer wall of the air inlet 1-1, and between the inner wall of the air outlet cover 2 and the outer wall of the plunger hole 2-3, and the air inlet 1-1 and the air outlet 2-1 are communicated through the annular space and the circumferential vent hole 2-2;

[0043] like Figure 1As shown, a plunger 3 with an "umbrella" structure is installed in the plunger hole 2-3, and the plunger 3 includes a cylinder and a cone that are fixedly connected; the plunger and the plunger hole are matched as a pair, and the cylinder can make reciprocating linear motion in the plunger hole; in order to ensure the precise match between the plunger 3 and the air inlet 1-1 to achieve the switch of the pressure control valve structure, the length of the cylinder is less than the depth of the plunger hole 2-3; the cylinder of the plunger 3 is the small end, and one end of the cone is called the large end. The small end of the plunger 3 is installed inside the plunger hole 2-3 and slidably matches with the plunger hole 2-3; the large end of the plunger 3 is outside the plunger hole 2-3 and is arranged toward the air outlet tube 1, and the small end of the plunger 3 and the plunger hole 2-3 are matched as a pair, and the small end of the plunger 3 can make reciprocating linear motion in the plunger hole 2-3. The spring 4 is installed between the large end of the plunger 3 and the spring fixing rib 1-2, and the two ends are supported by the plunger 3 and the spring fixing rib 1-2 respectively. The spring 4 is a compression spring, which abuts between the outlet tube 1 and the plunger 3, so that the plunger 3 maintains a tendency to move away from the outlet tube 1, that is, the spring 4 has a tendency to maintain an annular gap between the outer conical surface of the conical body of the plunger 3 and the inner conical surface at the end of the inlet duct 1-1. At the same time, in order to ensure the sealing effect when the plunger 3 closes the inlet duct 1-1, the inclination of the outer conical surface of the conical body of the plunger 3 is consistent with the inclination of the inner conical surface at the end of the inlet duct 1-1.

[0044] When the pressure control valve structure works normally, the gas enters the pressure control valve structure from the oil-gas separator through the air inlet 1-1, and then leaves the pressure control valve structure through the circumferential vent 2-2 and the air outlet 2-1 in sequence.

[0045] The force on the large end of the plunger 3 is the combined force of the internal pressure of the oil-gas separator (approximately equal to the crankcase pressure) and the elastic force of the spring 4, and the atmospheric communication hole 2-4 keeps the pressure of the small end of the plunger 3 (in the plunger hole 2-3) stable at atmospheric pressure, and the plunger 3 can move back and forth in a straight line following the change of the crankcase pressure. When the crankcase pressure is in the normal range, the combined force of the pressure on the large end of the plunger 3 and the spring elastic force is greater than the atmospheric pressure on the small end of the plunger 3. At this time, the back of the large end of the plunger 3 is close to the right side of the plunger hole 2-3, and the gas flow area between the large end of the plunger 3 and the intake duct 1-1 is the largest. When the crankcase pressure decreases, the combined force on the large end of the plunger 3 decreases, and the plunger 3 moves to the right under the action of the pressure difference. At this time, the gas flow area between the large end of the plunger 3 and the intake duct 1-1 decreases. During the movement, the spring force on the large end of the plunger 3 gradually increases, and finally the plunger 3 stops moving after the forces on both sides of the plunger 3 are balanced again. When the crankcase pressure is lower than the set value of the pressure control valve structure, the large end of the plunger 3 moves to the farthest end under the action of the pressure difference. At this time, the inner conical surface of the end of the inlet 1-1 of the outlet cylinder 1 is completely fitted with the conical outer conical surface of the plunger 3. The gas flow area between the large end of the plunger 3 and the inlet 1-1 is zero, the gas in the oil-gas separator stops flowing outward, and the crankcase pressure no longer continues to decrease. After the crankcase pressure rises to the normal range, the plunger 3 moves to the left under the action of the pressure difference, and the oil-gas separator can continue to discharge gas outward.

[0046] Since there is still a small amount of engine oil in the gas after being purified by the oil-gas separator, when the gas passes through the pressure control valve structure, the small amount of engine oil it carries will adhere to the inner wall, which helps lubricate the plunger 3 and the plunger hole 2-3 and reduce the friction between the plunger 3 and the plunger hole 2-3.

[0047] Embodiment 2

[0048] like Figure 4 As shown, this embodiment provides a gas outlet cover structure with a circumferential circular groove, in which the circumferentially evenly distributed circumferential vent holes 2-2 are replaced by a plurality of circumferentially distributed arc grooves 2-5. Compared with the circumferential vent holes 2-2, the arc grooves 2-5 are conducive to increasing the flow area of ​​the gas and further reducing the flow resistance of the gas.

[0049] The pressure control valve structure of the above two embodiments is adopted, and the air inlet 1-1 and the air outlet 2-1 are coaxially arranged through the relatively arranged air outlet cylinder 1 and the air outlet cover 2, and the automatic switch is realized through the cooperation of the air outlet cylinder 1, the air outlet cover 2, the plunger 3 and the spring 4. The coupled structure of the plunger 3 and the plunger hole 2-3 is adopted, so that the gas passage is composed of the air inlet 1-1, the annular space, the circumferential vent 2-2 and the air outlet 2-1 arranged axially, which reduces the turning amplitude and number of the gas in the pressure control valve structure, and is conducive to reducing the gas flow resistance. The pressure control valve structure uses the principle that the pressure difference formed by the elastic force of the spring 4, the internal pressure of the oil-gas separator and the atmospheric pressure drives the plunger 3 to move to adjust the crankcase pressure of the engine to prevent the crankcase pressure from being too low. At the same time, when the other structures remain unchanged, the pressure value set by the pressure control valve structure can be changed by adjusting the stiffness or preload of the spring.

[0050] Since there is still a small amount of engine oil in the gas after being purified by the oil-gas separator, when the oil and gas pass through the inside of the pressure control valve structure, the small amount of engine oil it carries will adhere to the inner wall, which helps to lubricate the plunger 3. Therefore, the residual engine oil carried in the gas through the oil-gas separator can achieve self-lubrication of the pressure control valve structure without the need for additional lubrication.

[0051] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An oil-gas separator pressure control valve structure based on a coupled structure, characterized in that: It includes a punching bag, a punching cover, a plunger and a spring; The air outlet tube is arranged opposite to the air outlet cover and is fixedly connected; The center of the air outlet cylinder is provided with an air inlet extending along its axial direction; the air inlet is used to communicate with the inside of the oil-gas separator, and an inner conical surface is processed at the end of the air inlet; The air outlet cover is provided with a plunger hole, an air outlet channel and a circumferential air vent; the plunger hole and the air outlet channel both extend along the axial direction of the air outlet cover and are arranged at intervals, the plunger hole is arranged at the center of one end of the air outlet cover facing the air outlet cylinder, and the bottom end is connected to the atmosphere; the air outlet channel is arranged at the center of the other end of the air outlet cover; A communicating annular space is formed between the inner side wall of the gas outlet cylinder and the outer side wall of the gas inlet passage, and between the inner side wall of the gas outlet cover and the outer side wall of the plunger hole; The circumferential vent holes are distributed along the circumference of the air outlet cover and are used to connect the annular space with the air outlet; The cross section of the plunger is in an "umbrella" shape, comprising a cylindrical body and a conical body that are fixedly connected; the plunger and the plunger hole are matched as a pair, and the cylindrical body can perform reciprocating linear motion in the plunger hole; The spring is abutted between the cone and the punching bag.

2. The pressure control valve structure according to claim 1, characterized in that: The air outlet cover is also provided with an atmosphere communication hole; The inner end of the atmosphere communication hole is communicated with the plunger hole, and the outer end is communicated with the atmosphere.

3. The pressure control valve structure according to claim 2, characterized in that: The atmosphere communication hole is composed of an axial hole extending in the axial direction and a radial hole extending in the radial direction. The air inlet, the air outlet, the plunger hole and the axial hole are all coaxially arranged.

4. The pressure control valve structure according to claim 1, characterized in that: The air outlet tube is provided with spring fixing ribs evenly distributed on the outer side wall of the air inlet passage; The spring is a cylindrical compression spring with two ends tightly connected, one end of which is sleeved on the outer peripheral side of the spring fixing rib, and the other end of which is sleeved on the outer peripheral surface of the cone.

5. The pressure control valve structure according to claim 1, characterized in that: The slope of the outer conical surface of the cone is consistent with the slope of the inner conical surface.

6. The pressure control valve structure according to claim 1, characterized in that: The length of the cylinder is less than the depth of the plunger hole.

7. The pressure control valve structure according to claim 1, characterized in that: The air outlet tube is connected to the air outlet cover via threads.

8. The pressure control valve structure according to claim 1, characterized in that: The circumferential vent holes are evenly distributed along the circumference of the air outlet cover.

9. The pressure control valve structure according to any one of claims 1 to 8, characterized in that: Also includes a sealing ring; The sealing ring is installed between the air outlet tube and the air outlet cover, and is used for sealing the connection between the air outlet tube and the air outlet cover.

10. The pressure control valve structure according to claim 9, characterized in that: The sealing ring is an O-type rubber ring.

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