JP2024512248A - Solenoid valve and air conditioning system - Google Patents

Abstract

A solenoid valve (100) and an air conditioning system are provided, the solenoid valve (100) includes a valve body (110) and a core metal (120), and the valve body (110) communicates with a valve chamber. A passage (1201) is provided in the core metal (120), having an inlet (1101) and an outlet (1102), one end of the passage (1201) communicates with the valve chamber, and the other end communicates with the sealing member (121). ), the core bar (120) is reversibly closed at the outlet (1102) by a sealing member (121), and the solenoid valve (100) has a first orifice (131) and/or a second orifice (132). The first orifice (131) is provided in the sealing member (121), and when closed at the outlet (1102), one end of the first orifice (131) communicates with the outlet (1102), and the other end communicates with the outlet (1102). A passage (1201) communicates with the valve chamber, and a second orifice (132) is provided in the valve body (110) and communicates with the valve chamber and the outlet (1102). Since the air conditioning system uses the solenoid valve (100), there is no need to provide parallel capillary tubes and solenoid valves, and the equipment cost can be reduced and the structure can be simplified. [Selection diagram] Figure 2

Description

Related Applications This disclosure claims priority to the Chinese application “Solenoid Valve and Air Conditioning System” under application number 202120531796.9 filed on March 11, 2021, the entire contents of which are incorporated herein by reference. It will be done.

TECHNICAL FIELD The present disclosure relates to the technical field of air conditioning systems and accessories thereof, and particularly relates to solenoid valves and air conditioning systems.

In a conventional air conditioning system, a compressor discharges refrigerant and lubricating oil, which are separated by an oil separator, and then the separated lubricating oil is flowed back to the air inlet of the compressor by a parallel capillary tube and a solenoid valve. . When the compressor discharges a large amount of lubricating oil, the solenoid valve is opened to ensure that the lubricating oil flows back into the compressor in a timely manner, preventing damage to the compressor due to lack of oil. However, when the air conditioning system adopts the above-mentioned conventional form, it is necessary to provide a capillary tube and a solenoid valve in parallel with the oil return pipe of the compressor, resulting in high cost and a complicated structure.

One aspect of an embodiment of the present disclosure includes a valve body and a core metal, the valve body having a valve chamber, an inlet and an outlet communicating with the valve chamber, and a passage provided in the core metal, One end of the passage communicates with the valve chamber, and the other end is closed by a sealing member, and a return member is connected between the passage and the valve body to allow the core metal to be returned to be closed at the outlet by the sealing member. A solenoid valve having a first orifice and/or a second orifice, the first orifice being provided in the sealing member, and one end of the first orifice communicating with the outlet when the core bar is closed at the outlet. , the other end of which is in communication with the valve chamber by a passageway, and a second orifice is provided in the valve body to provide a solenoid valve that is in communication with the valve chamber and the outlet.

Other aspects of embodiments of the present disclosure include a compressor and an oil separator, the compressor having an oil outlet and an air inlet, the oil separator having an oil inlet and an oil outlet, and the oil separator having an oil inlet and an oil outlet. The air conditioning system has an outlet in communication with an oil inlet, further comprising a solenoid valve as proposed in the present disclosure and described in the above embodiments, the inlet of the solenoid valve is in communication with an oil outlet, and the outlet of the solenoid valve is in communication with an oil outlet. An air conditioning system is provided that communicates with the air intake.

FIG. 2 is a cross-sectional view of a solenoid valve according to an example embodiment. FIG. 2 is an enlarged view of section A shown in FIG. 1. FIG. FIG. 6 is a cross-sectional view of a solenoid valve according to another exemplary embodiment. 4 is an enlarged view of part B shown in FIG. 3. FIG. FIG. 7 is a partially enlarged view of a solenoid valve according to another exemplary embodiment. FIG. 6 is a partially enlarged view of a solenoid valve according to another exemplary embodiment. 1 is a partial system schematic diagram of an air conditioning system according to an exemplary embodiment; FIG.

Exemplary embodiments will now be described in more detail with reference to the drawings. However, the exemplary embodiments may take many forms and should not be construed as limited to the embodiments set forth herein; rather, the presentation of these embodiments makes this disclosure more comprehensive and complete. and is provided to comprehensively convey the concepts of the exemplary embodiments to those skilled in the art. Since the same reference numerals in the drawings indicate the same or similar configurations, detailed description thereof will be omitted.

Referring to FIG. 1, a cross-sectional view of a solenoid valve proposed in the present disclosure is representatively shown. In this exemplary embodiment, the solenoid valve proposed in the present disclosure will be described by taking as an example a backflow configuration of a compressor applied to an air conditioning system. Those skilled in the art will be able to make various modifications, additions, substitutions, deletions, or other modifications to the specific embodiments described below in order to apply the relevant designs of the present disclosure to other types of air conditioning systems or other equipment. It is easily understood that even if modifications are made, these modifications are still within the scope of the principles of the solenoid valve proposed in this disclosure.

As shown in FIG. 1, in this embodiment, the electromagnetic valve proposed in the present disclosure includes a valve body 110 and a core metal 120. Referring to FIG. 2, FIG. 2 typically shows an enlarged view of section A shown in FIG. Hereinafter, the structure, connection method, and functional relationship of each main component of the electromagnetic valve proposed in the present disclosure will be described in detail with reference to the above drawings.

As shown in FIGS. 1 and 2, in this embodiment, the valve body 110 has a valve chamber, an inlet 1101, and an outlet 1102, and each of the inlet 1101 and the outlet 1102 communicates with the valve chamber. A passage 1201 is provided in the core metal 120 , one end of the passage 1201 communicates with the valve chamber, and the other end of the passage 1201 is closed by a sealing member 121 . A return member 122 is connected between the passage 1201 and the valve body 110 to allow the core metal 120 to return to its original state and be closed at the outlet 1102 by the sealing member 121 . Based on this, the solenoid valve has a first orifice 131. A first orifice 131 is provided in the sealing member 121 , and when the core bar 120 is closed at the outlet 1102 , one end of the first orifice 131 is communicated with the outlet 1102 , and the other end of the first orifice 131 is connected to the valve chamber by a passage 1201 . , so that the solenoid valve has a constant flow rate even when the core metal 120 is closed. According to this, when a solenoid valve is applied to the oil return form of a compressor in an air conditioning system, after the refrigerant and lubricating oil discharged from the compressor are separated by an oil separator, the solenoid valve is used to draw air into the compressor. Can flow back into the mouth. During normal operation, lubricating oil is flowed back to the compressor by the orifice of the solenoid valve, and when the compressor is discharging more lubricating oil, the solenoid valve is opened to ensure that the lubricating oil is flowed back to the compressor in a timely manner. . With the above structural design, the air conditioning system utilizes the solenoid valve proposed in the present disclosure, eliminating the need to provide parallel capillary tubes and solenoid valves, significantly reducing equipment costs and simplifying the system structure. Can be done.

Optionally, as shown in FIGS. 1 and 2, in this embodiment, the solenoid valve includes one first orifice 131 provided at the center of the sealing member 121 and extending in the direction of the centerline of the passageway 1201. Accordingly, the present disclosure can ensure that the lubricating oil flows through the passage 1201 and the first orifice 131 to the outlet 1102.

Optionally, as shown in FIGS. 1 and 2, in this embodiment, the sealing member 121 may have a substantially columnar structure, ie, the cross section of the sealing member 121 may be substantially rectangular. Based on this, the sealing member 121 may be provided on the core bar 120 so as to be located in the middle, that is, the centerline of the sealing member 121 may substantially coincide with the centerline of the passage 1201. According to this, if the first orifice 131 extends in the direction of the center line of the passage 1201, it also extends substantially in the direction of the center line of the sealing member 121.

Optionally, as shown in FIGS. 1 and 2, in this embodiment, the valve body 110 may include a duct portion 111 and a body portion 112. Specifically, the duct part 111 may have a substantially cylindrical structure, the cylindrical opening at one end of the duct part 111 is closed, the core metal 120 is provided in the cylindrical chamber 1111 of the duct part 111, A gap G is provided between the core metal 120 and the cylindrical wall of the duct portion 111. The main body part 112 is provided at the cylindrical opening at the other end of the duct part 111, and the main body part 112 has an internal cavity 1121, and the internal cavity 1121 communicates with the cylindrical chamber 1111 of the duct part 111, thereby allowing the valve chamber of the electromagnetic valve to open. Together, the inlet 1101 and the outlet 1102 of the solenoid valve may be provided in the body portion 112, respectively.

Furthermore, as shown in FIG. 1, the valve body 110 has a cylindrical structure including the duct part 111, and the cylindrical opening at one end is closed. An absorber member 113 may be provided in the chamber 1111 to close the cylindrical opening at one end of the duct portion 111. Based on this, the return member 122 may be connected between the attractor member 113 and the passage 1201 of the core bar 120.

Furthermore, as shown in FIG. 1, based on the structural design in which the attractor member 113 is provided in the cylindrical chamber 1111 of the duct portion 111, in this embodiment, a step structure 1202 is provided in the passage 1201, and the return One end of the member 122 may be connected to the step surface of the step structure 1202, and the other end of the return member 122 may protrude from the passage 1201 and be connected to the attractor member 113.

Optionally, as shown in FIG. 1, in this embodiment, return member 122 may include a return spring.

Optionally, as shown in FIG. 2, in this embodiment, the core bar 120 is provided with a balancing hole 1202 that extends substantially in the radial direction of the core bar 120 and communicates with the passage 1201 of the core bar 120. Good too.

Based on the detailed description of the first embodiment of the electromagnetic valve proposed in the present disclosure described above, the operating principle of the electromagnetic valve in the first embodiment will be schematically described below.

When the core bar 120 is closed, that is, the core bar 120 is closed at the outlet 1102 of the solenoid valve by the sealing member 121, the lubricating oil separated by the oil separator will still flow from the "inlet 1101 → valve chamber (internal The flow can flow through the solenoid valve via the path of "cavity 1121 → balancing hole 1202 → cylindrical chamber 1111) → passage 1201 → first orifice 131 → outlet 1102", whereby the solenoid valve has a constant flow rate in the closed state. has.

When there is a large amount of lubricating oil separated by the oil separator, the solenoid valve is opened and the core bar 120 is opened, that is, the core bar 120 is removed from the outlet 1102, and the lubricant oil flows from the inlet 1101 to the valve chamber ( The flow can flow through the electromagnetic valve via the path of "internal cavity 1121) → outlet 1102", and of course, at the same time "inlet 1101 → valve chamber (internal cavity 1121 → cylindrical chamber 1111) → passage 1201 → first orifice 131 → outlet 1102'' path through the solenoid valve, thereby satisfying a high flow rate flow.

Embodiment 2 of solenoid valve
Based on the detailed description of the first embodiment of the electromagnetic valve proposed in the present disclosure described above, a second embodiment of the electromagnetic valve proposed in the present disclosure will be described below with reference to FIGS. 3 and 4. In the second embodiment, the solenoid valve proposed in the present disclosure employs substantially the same structural design as the first embodiment, and the main differences of the solenoid valve in the second embodiment will be described below.

As shown in FIG. 3, a cross-sectional view of the electromagnetic valve according to the second embodiment proposed in the present disclosure is typically shown, and FIG. 4 is a representative enlarged view of part B shown in FIG. There is.

As shown in FIGS. 3 and 4, in this embodiment, the sealing member 121 has a substantially spherical structure. Based on this, the electromagnetic valve proposed in the present disclosure has the second orifice 132 and does not have the first orifice 131. Specifically, a second orifice 132 is provided in the valve body 110, and the second orifice 132 communicates with the valve chamber and the outlet 1102. According to this, since the sealing member 121 having a spherical structure is likely to rotate during the operation of the core bar 120, by not providing the first orifice 131 in the sealing member 121, the rotation of the sealing member 121 causes the first orifice to rotate. It is possible to prevent the orifice 131 from being unable to communicate with the passage 1201 and the outlet 1102. Providing the second orifice 132 in the valve body 110 allows direct communication with the valve chamber and the outlet 1102 and also ensures that the solenoid valve proposed in this disclosure has a constant flow rate even in the closed state.

Optionally, as shown in FIGS. 3 and 4, in this embodiment, the valve body 110 may have a body portion 112, with an internal cavity 1121 of the body portion 112 defining a portion of the valve chamber. , and an inlet 1101 and an outlet 1102 of the solenoid valve are provided in the main body 112, respectively. Based on this, the second orifice 132 may be provided in the body portion 112, and the second orifice 132 may be communicated with the internal cavity 1121 and the outlet 1102.

Note that in other embodiments, when the solenoid valve proposed in the present disclosure is provided with only the second orifice 132, the sealing member 121 of the solenoid valve may have another structure, for example, the sealing member of the solenoid valve in the first embodiment. It may have the same structure as the member 121, and is not limited to this embodiment.

Based on the detailed description of the second embodiment of the solenoid valve proposed in the present disclosure described above, the operating principle of the solenoid valve in the second embodiment will be schematically described below.

When the core bar 120 is closed, that is, the core bar 120 is closed at the outlet 1102 of the solenoid valve by the sealing member 121, the lubricating oil separated by the oil separator will still flow from the "inlet 1101 → valve chamber (internal The flow can flow through the solenoid valve via the path "cavity 1121→second orifice 132→outlet 1102", so that the solenoid valve has a constant flow rate in the closed state.

When there is a large amount of lubricating oil separated by the oil separator, the solenoid valve is opened and the core bar 120 is opened, that is, the core bar 120 is removed from the outlet 1102, and the lubricant oil flows from the inlet 1101 to the valve chamber ( It can flow through the electromagnetic valve via the path of "internal cavity 1121) → outlet 1102", and of course, at the same time via the path of "inlet 1101 → valve chamber (internal cavity 1121 → second orifice 132 → outlet 1102") It can also flow through a solenoid valve, thereby satisfying high flow rates.

Embodiment 3 of solenoid valve
Based on the detailed description of the first and second embodiments of the electromagnetic valve proposed in the present disclosure described above, the third embodiment of the electromagnetic valve proposed in the present disclosure will be described below with reference to FIG. do. In the third embodiment, the solenoid valve proposed in the present disclosure adopts almost the same structural design as the above-described first and second embodiments, and the main differences of the solenoid valve in the third embodiment will be described below. explain.

As shown in FIG. 5, a partially enlarged view of a solenoid valve according to a third embodiment proposed in the present disclosure is representatively shown. Can be done.

As shown in FIG. 5, in this embodiment, the electromagnetic valve proposed in the present disclosure has a first orifice 131 and a second orifice 132. Specifically, the first orifice 131 is provided in the sealing member 121, and the first orifice 131 communicates with the passage 1201 and the outlet 1102. A second orifice 132 is provided in the valve body 110 , and the second orifice 132 communicates with the valve chamber and the outlet 1102 . With the above structural design, the electromagnetic valve proposed in the present disclosure can have a constant flow rate even when the electromagnetic valve is in the closed state by using the first orifice 131 and the second orifice 132.

Based on the detailed description of the third embodiment of the solenoid valve proposed in the present disclosure described above, the operating principle of the solenoid valve in the third embodiment will be schematically described below.

When the core bar 120 is closed, that is, the core bar 120 is closed at the outlet 1102 of the solenoid valve by the sealing member 121, the lubricating oil separated by the oil separator will still flow from the "inlet 1101 → valve chamber (internal via the routes of "cavity 1121 → balancing hole 1202 → cylindrical chamber 1111) → passage 1201 → first orifice 131 → outlet 1102" and "inlet 1101 → valve chamber (inner cavity 1121) → second orifice 132 → outlet 1102". can flow through the solenoid valve such that the solenoid valve has a constant flow rate in the closed state.

When there is a large amount of lubricating oil separated by the oil separator, the solenoid valve is opened and the core bar 120 is opened, that is, the core bar 120 is removed from the outlet 1102, and the lubricant oil flows from the inlet 1101 to the valve chamber ( The flow can flow through the electromagnetic valve via the path of "internal cavity 1121) → outlet 1102", and of course, at the same time "inlet 1101 → valve chamber (internal cavity 1121 → cylindrical chamber 1111) → passage 1201 → first orifice 131 → outlet 1102'' and ``inlet 1101→valve chamber (internal cavity 1121)→second orifice 132→outlet 1102'', thereby satisfying a high flow rate flow.

Embodiment 4 of solenoid valve
Based on the detailed description of the third embodiment of the electromagnetic valve proposed in the present disclosure described above, a fourth embodiment of the electromagnetic valve proposed in the present disclosure will be described below with reference to FIG. 6. In the fourth embodiment, the solenoid valve proposed in the present disclosure employs substantially the same structural design as the third embodiment described above, and the main differences of the solenoid valve in the fourth embodiment will be described below.

As shown in FIG. 6, a partially enlarged view of the fourth embodiment of the electromagnetic valve proposed in the present disclosure is representatively shown, thereby making it possible to refer to FIG. 2 corresponding to the enlarged area of section A in FIG. Can be done.

As shown in FIG. 6, in this embodiment, the solenoid valve proposed in the present disclosure has three first orifices 131 and two second orifices 132. Specifically, three first orifices 131 are provided in the sealing member 121 and are spaced apart, and the first orifices 131 communicate with the passage 1201 and the outlet 1102. Two second orifices 132 are provided in the valve body 110 and spaced apart, and the second orifices 132 communicate with the valve chamber and the outlet 1102. With the above structural design, the electromagnetic valve proposed in the present disclosure can have a constant flow rate even when the electromagnetic valve is in the closed state by using the three first orifices 131 and the two second orifices 132.

Note that in other embodiments, when the electromagnetic valve proposed in the present disclosure has only the first orifice 131, the number of the first orifices 131 may be one, or may be two or more. When the electromagnetic valve proposed in the present disclosure has only the second orifice 132, the number of the second orifice 132 may be one, or two or more. When the electromagnetic valve proposed in the present disclosure has the first orifice 131 and the second orifice 132 at the same time, the number of the first orifice 131 may be one or two or more, and the number of the first orifice 131 may be one or more. The number may be one, or may be two or more. Further, when the electromagnetic valve has the first orifice 131 and the second orifice 132 at the same time, the number of the first orifice 131 and the second orifice 132 may be the same, but is not limited to this.

It should be noted at this point that the solenoid valves shown in the drawings and described herein are merely illustrative of some of the various solenoid valves that may employ the principles of the present disclosure. It is to be clearly understood that the principles of the present disclosure are not limited to any details or any components of the solenoid valves shown in the drawings or described herein.

As described above, by providing the first orifice and/or the second orifice, the solenoid valve proposed in the present disclosure has a constant flow rate even when the core metal is closed at the outlet. According to this, after the refrigerant and lubricating oil discharged from the compressor are separated by the oil separator, they can flow back to the air intake port of the compressor by the solenoid valve. During normal operation, lubricating oil is flowed back into the compressor by the orifice of the solenoid valve, and when the compressor is discharging more lubricating oil, the solenoid valve is opened to ensure that the lubricating oil is flowed back into the compressor in a timely manner. . With the above structural design, the air conditioning system utilizes the solenoid valve proposed in the present disclosure, and there is no need to provide parallel capillary tubes and solenoid valves, which greatly reduces equipment costs and simplifies the system structure. Can be done.

Based on the above detailed description of some exemplary embodiments of the solenoid valve proposed in the present disclosure, an exemplary embodiment of the air conditioning system proposed in the present disclosure will be described below with reference to FIG. do.

Referring to FIG. 7, a partial system schematic diagram of the air conditioning system proposed in the present disclosure is typically shown, and specifically, an oil return portion of the compressor of the air conditioning system is shown. In this exemplary embodiment, the air conditioning system proposed in this disclosure is described by way of example as including a compressor oil return design. Those skilled in the art will be able to make various modifications, additions, substitutions, deletions, or other modifications to the specific embodiments described below to apply the relevant designs of the present disclosure to other types of air conditioning systems or other processes. It is easily understood that even if modifications are made, these modifications are still within the principles of the air conditioning system proposed in this disclosure.

As shown in FIG. 7, in this embodiment, the air conditioning system proposed in the present disclosure includes a compressor 200 and an oil separator 300. Specifically, the compressor 200 has an oil discharge port and an air suction port, and the oil separator 300 has an oil inlet and an oil outlet, and the oil discharge port is communicated with the oil inlet. Based on this, the air conditioning system further includes the solenoid valve 100 proposed in the present disclosure and described in detail in the above embodiments, the inlet of the solenoid valve 100 is communicated with the oil outlet by the first pipe 410, and the solenoid valve The outlet of 100 is communicated with the air intake port by a second pipe 420. According to this, by employing the solenoid valve 100 proposed in the present disclosure, during normal operation, lubricating oil flows back to the compressor 200 by the orifice of the solenoid valve 100, and the lubricating oil discharged by the compressor 200 is large. At this time, solenoid valve 100 is opened to ensure that lubricating oil is flowed back to compressor 200 in a timely manner. Due to the above structural design, the air conditioning system proposed in the present disclosure does not require parallel capillary tubes and solenoid valves 100, which greatly reduces equipment costs, and at the same time simplifies system piping, allowing the solenoid valves 100 and the air conditioning system to can be protected.

It should be noted at this point that the air conditioning systems shown in the drawings and described herein are merely illustrative of some of the various air conditioning systems that may employ the principles of the present disclosure. It is to be clearly understood that the principles of the present disclosure are not limited to any details or any components of the air conditioning system shown in the drawings or described herein.

As mentioned above, by adopting the solenoid valve proposed in the present disclosure, the air conditioning system proposed in the present disclosure allows lubricating oil to flow back to the compressor through the orifice of the solenoid valve during normal operation, and the air conditioning system is discharged from the compressor. When more lubricant is present, a solenoid valve is opened to ensure that the lubricant flows back to the compressor in a timely manner. With the above structural design, the air conditioning system proposed in the present disclosure does not require parallel capillary tubes and solenoid valves, and can significantly reduce equipment costs and simplify the system structure.

Although this disclosure has been described with reference to several exemplary embodiments, it is to be understood that the terminology used is for purposes of description and illustration, and not of limitation. The embodiments described above are not limited to any of the details described above, as the present disclosure may be embodied in various forms without departing from the spirit or essence of the disclosure, and the embodiments described above are not limited to any of the details described above, and the embodiments described above are They are to be construed broadly within the spirit and scope limited by the claims, and accordingly, all changes and modifications that come within the scope of the claims or their equivalents are intended to be covered by the appended claims. It should be understood that the scope should be covered by:

Claims (10)

Including the valve body and core metal,
The valve body has a valve chamber and an inlet and an outlet communicating with the valve chamber,
A passage is provided in the core metal, one end of the passage communicates with the valve chamber, the other end is closed by a sealing member, and the core metal can be returned between the passage and the valve body. A solenoid valve, wherein a return member for closing the outlet by the sealing member is connected to the solenoid valve,
having a first orifice and/or a second orifice;
the first orifice is provided in the sealing member, and when the mandrel is closed at the outlet, one end of the first orifice communicates with the outlet, and the other end communicates with the valve chamber through the passage;
A solenoid valve, wherein the second orifice is provided in the valve body and communicates with the valve chamber and the outlet. The electromagnetic valve according to claim 1, further comprising the first orifice provided at a central position of the sealing member and extending in the direction of a centerline of the passage. 2. The solenoid valve of claim 1, including at least two spaced apart first orifices, each extending in the direction of a centerline of the passageway. the valve body has a body portion, an internal cavity of the body portion defines a portion of the valve chamber, the inlet and the outlet are each provided in the body portion;
The electromagnetic valve according to claim 1, wherein the second orifice is provided in the main body, and the second orifice communicates with the internal cavity and the outlet. The solenoid valve of claim 1, including at least two spaced apart second orifices. The electromagnetic valve according to claim 1, wherein the core metal has a spherical structure, and the electromagnetic valve has only the second orifice. The valve body includes a duct part and a main body part,
The duct part has a cylindrical structure, the cylindrical opening at one end of the duct part is closed, the core bar is provided in a cylindrical chamber of the duct part, and has a gap between it and the cylindrical wall,
The body portion is provided at a cylindrical opening at the other end of the duct portion, the internal cavity of the body portion communicates with the cylindrical chamber of the duct portion to jointly define the valve chamber, and the inlet and outlet are each The electromagnetic valve according to claim 1, which is provided in the main body. A suction element member that closes a cylinder opening at one end of the duct part is provided in the cylindrical chamber of the duct part, and the return member is connected between the suction element member and the passage of the core metal. The solenoid valve according to claim 7. 9. A step structure is provided in the passageway, one end of the return member is connected to the step surface of the step structure, and the other end protrudes from the passageway and is connected to the suction element member. Solenoid valve. comprising a compressor and an oil separator, the compressor having an oil outlet and an air inlet, the oil separator having an oil inlet and an oil outlet, and the oil outlet communicating with the oil inlet. An air conditioning system that
An air conditioning system further comprising a solenoid valve according to any one of claims 1 to 9, wherein an inlet of the solenoid valve is communicated with the oil outlet and an outlet of the solenoid valve is communicated with the air intake.

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