Screw main machine

Abstract

The utility model discloses a screw main machine which comprises an air cylinder, a screw rotor is installed in the air cylinder, the air cylinder is provided with an oil return hole, an oil inlet hole and a communicating part, the oil return hole and the oil inlet hole are communicated through the communicating part, a first channel is formed between the communicating part and the oil inlet hole, a one-way valve assembly is installed in the communicating part, and a second channel is formed between the communicating part and the oil inlet hole. The one-way valve assembly is used for opening and closing the first channel, the one-way valve assembly limits lubricating oil from flowing into the communicating part from the first channel in a one-way mode, the lubricating oil enters the first channel through the oil inlet hole to drive the one-way valve assembly to be opened, and the lubricating oil in the first channel enters the communicating part and flows to the oil return hole to form oil return. By arranging the communicating part capable of installing the one-way valve assembly on the air cylinder, the air cylinder and the one-way valve assembly are integrated, an external pipeline does not need to be arranged, the structure is simple, assembling is convenient and fast, the integration degree is high, and cost is low.

Description

Technical Field

[0001] The present application relates to the technical field of compressors, and more specifically to a screw main engine. Background Art

[0002] A compressor is a driven fluid machine that lifts low-pressure gas to high-pressure gas. The screw main unit is the core component of the screw compressor. A pair of intermeshing screw rotors are arranged in parallel in the cylinder of the screw main unit. One end of the screw rotor is the suction end, which is connected to the suction port of the machine body, and the other end of the screw rotor is the exhaust end, which is connected to the exhaust port of the machine body. As the screw rotor rotates, the gas is sucked in from the suction end and discharged from the exhaust end after compression, thus completing the gas compression process. Because the screw main unit runs at high speed, lubricating oil is required to lubricate its compression mechanism, bearings and other parts to avoid wear and damage, and at the same time help heat dissipation and sealing. In the screw main unit, oil return is an important circulation process in the screw main unit to ensure the effective circulation and use of lubricating oil. The oil return of lubricating oil usually refers to the process in which the lubricating oil returns to the lubrication system after completing the lubrication task to be reused or recycled. At present, the oil return pipe of the screw main unit on the market has one end inserted into the oil-gas separator and the other end connected to the compression main unit. This connection method must be equipped with a one-way valve. Otherwise, when the machine stops, the lubricating oil may flow back into the oil-gas separator due to the internal pressure, which will increase the failure points and costs, and the usability of the screw main unit is not stable enough. For example, the utility model patent with publication number: CN210178544U discloses an air compressor with switchable secondary oil return, in which one end of the oil-gas mixing pipeline is connected to the oil outlet of the compressor main unit, and the other end is connected to the oil inlet of the oil-gas separator; one end of the first oil return branch pipe is directly or indirectly connected to the oil separated by the oil-gas separator, and the other end is connected to the oil return port of the compressor main unit; two first valves are arranged on the first oil return branch pipe; the first check valve is arranged on the first oil return branch pipe and is located between the two first valves; one end of the second oil return branch pipe is directly or indirectly connected to the oil separated by the oil-gas separator, and the other end is connected to the oil inlet of the intake valve; the second valve is arranged on the second oil return branch pipe; the second check valve is arranged on the second oil return branch pipe and is located between the second valve and the oil inlet of the intake valve; this technical solution avoids the backflow of lubricating oil by arranging a check valve, but the pipeline design of this external check valve method is relatively complicated and cumbersome, the degree of integration is low and its production cost is high. Utility Model Content

[0003] The technical problem to be solved by the present application is to provide a screw main unit, in which a connecting portion capable of installing a one-way valve assembly is provided on the cylinder, thereby integrating the cylinder with the one-way valve assembly, without the need to provide an external pipeline, and having a simple structure and convenient assembly, and having a high degree of integration and low cost.

[0004] The present application provides a screw main unit, including a cylinder, a screw rotor installed in the cylinder, an oil return hole, an oil inlet hole and a connecting part are arranged on the cylinder, the oil return hole and the oil inlet hole are connected through the connecting part, a first channel is arranged between the connecting part and the oil inlet hole, a one-way valve assembly is installed in the connecting part, the one-way valve assembly is used to open and close the first channel, the one-way valve assembly limits the lubricating oil from the first channel to flow into the connecting part in one direction, the lubricating oil enters the first channel through the oil inlet hole to drive the one-way valve assembly to open, and the lubricating oil in the first channel enters the connecting part and flows to the oil return hole to form return oil.

[0005] In the technical scheme, a connecting part is provided on the cylinder to connect the oil return hole and the oil inlet hole, the oil inlet hole is connected to the oil return pipe, the lubricating oil is transported to the oil inlet hole through the oil return pipe, the lubricating oil flows into the connecting part and the oil return hole in sequence through the oil inlet hole to form oil return, thereby ensuring the effective circulation and use of the lubricating oil, the oil inlet hole and the connecting part are connected through a first channel, the lubricating oil in the oil inlet hole enters the connecting part through the first channel, a one-way valve assembly capable of opening and closing the first channel is installed in the connecting part, the one-way valve assembly limits the lubricating oil to flow into the connecting part only in one direction from the first channel, and prevents the lubricating oil in the circulation part from flowing back to the first channel to affect the operation of the screw main unit, the lubricating oil passes through the oil inlet hole and the first channel in sequence through the oil return pipe, the lubricating oil in the first channel can drive the one-way valve assembly to open, thereby allowing the lubricating oil to enter the connecting part and the oil return hole in one direction to form oil return, the connecting part and the cylinder are an integrally formed structure, the one-way valve assembly is installed in the connecting part to replace the conventional external one-way valve, the integration is higher, and there is no need to set up an external pipeline, the structure is simple, the assembly is convenient, and the cost is low.

[0006] As an improvement, the connecting part is provided with a cover, and the cover is covered with the connecting part to form a cavity for accommodating the one-way valve assembly. In the technical solution, a cover is provided on the connecting part, and the connecting part is covered with the cover to form a cavity for accommodating lubricating oil, and the one-way valve assembly can be installed in the cavity, and the assembly structure is simple and reliable.

[0007] As an improvement, the one-way valve assembly is installed in the cavity to separate the cavity into a first cavity and a second cavity, the first cavity is connected to the first channel, the second cavity is connected to the oil return hole, the one-way valve assembly is provided with a second channel, and the first cavity and the second cavity are connected through the second channel. In the present technical solution, the cavity is separated into a first cavity and a second cavity by installing a one-way valve assembly, the first cavity is connected to the first channel, the second cavity is connected to the oil return hole, and a second channel connecting the first cavity and the second cavity is provided on the one-way valve assembly. The lubricating oil in the first channel can drive the one-way valve assembly to open and enter the first cavity. The lubricating oil in the first cavity flows into the second cavity and the oil return hole through the second channel to form return oil. The one-way valve assembly is opened only by the lubricating oil in the first channel, which can prevent the lubricating oil from flowing back, and the lubricating oil flow path is smoother and more reliable.

[0008] As an improvement, the one-way valve assembly includes a float, an elastic member and a locking member which are sequentially installed in the cavity, the locking member is connected to the connecting portion to separate the cavity into a first cavity and a second cavity, the float and the elastic member are both installed in the first cavity, and a second channel connecting the first cavity and the second cavity is provided on the locking member. In the present technical solution, a one-way valve assembly is provided which is composed of a float, an elastic member and a locking member, the cavity is separated into a first cavity and a second cavity which are distributed up and down by the locking member, the float and the elastic member are both installed in the first cavity, the float and the elastic member cooperate to open and close the first channel in one direction, and the one-way valve assembly has a simple and reliable structure and is easy to assemble.

[0009] As an improvement, one end of the elastic member is in contact with the locking member, and the other end of the elastic member is in contact with the float, and the float closes the first channel under the action of the elastic member. In this technical solution, an elastic member is arranged and installed between the locking member and the float, and the float is located at the interface between the first channel and the first cavity. The float can open and close the first channel under the action of the elastic member. When the lubricating oil enters the first channel from the oil inlet, the lubricating oil acts on the float so that the float compresses the elastic member and thus detaches from the interface between the first channel and the first cavity. The lubricating oil can enter the first cavity and flow through the second channel, the second cavity and the oil return hole in sequence to complete the oil return. When the lubricating oil stops entering the oil inlet, the float is reset under the action of the elastic member and closes the interface between the first channel and the first cavity to prevent the lubricating oil from flowing back. The one-way valve assembly has a simple and reliable structure.

[0010] As an improvement, the locking member is provided with a mounting groove adapted to the elastic member, and the elastic member is installed and limited in the mounting groove. In this technical solution, by providing a mounting groove in the locking member, the locking member installs the limiting elastic member through the mounting groove, which can prevent the elastic member from shifting in the first cavity and thus affecting the performance of the one-way valve assembly, and the assembly structure is more reliable.

[0011] As an improvement, the second channel is a through hole provided on the locking member, and the through hole is connected to the mounting groove. In this technical solution, the second channel is provided as a through hole on the locking member, and the through hole is connected to the mounting groove and the second cavity, so that the lubricating oil in the first cavity flows into the second cavity through the mounting groove and the through hole, and the through hole structure is simple.

[0012] As an improvement, the elastic member is a spring and the locking member is a bolt structure. In this technical solution, the elastic member is a spring and the locking member is a bolt structure, the structure is simple and reliable, and the one-way valve assembly has a low cost.

[0013] As an improvement, the locking member is connected to the connecting portion by internal and external threads. In this technical solution, the locking member and the connecting portion are set to be threadedly connected and limited, and the assembly of the locking member is simple and reliable.

[0014] As an improvement, the connecting part is detachably connected with an oil sight glass, and the oil sight glass is configured as the cover body. In the technical solution, the connecting part is provided with an oil sight glass, and the oil sight glass is connected with the connecting part as a cover body, so that the operator can also see the situation in the connecting part through the oil sight glass, which is convenient for timely maintenance, and the oil sight glass is detachably connected with the connecting part, so that the operator can disassemble and assemble the one-way valve assembly, which is more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic cross-sectional view of a screw main unit in the present application in the main viewing direction.

[0016] Figure 2 For this application Figure 1 A local enlarged schematic diagram of point A in the middle.

[0017] Figure 3 This is a schematic cross-sectional view of a screw main unit in the present application from the side.

[0018] Figure 4 For this application Figure 3 A local enlarged schematic diagram of point B in the middle.

[0019] Figure 5 This is a partial cross-sectional schematic diagram of a screw main unit in the present application when viewed from above.

[0020] As shown in the figure: 1. Cylinder; 11. Oil return hole; 12. Oil inlet hole; 13. Connecting part; 131. First cavity; 132. Second cavity; 14. First channel; 2. One-way valve assembly; 21. Float; 22. Elastic member; 23. Locking member; 231. Mounting groove; 232. Second channel; 3. Cover body. DETAILED DESCRIPTION

[0021] In order to better understand the present application, a more detailed description of various aspects of the present application will be made with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and do not limit the scope of the present application in any way. Throughout the specification, the same figure numerals refer to the same elements.

[0022] In the drawings, the thickness, size and shape of objects have been slightly exaggerated for ease of explanation. The drawings are only examples and are not drawn strictly to scale.

[0023] It should also be understood that the terms “comprises,” “including,” “has,” “contains,” and “comprising,” when used in this specification, indicate the presence of the described features, integers, steps, operations, elements, and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, and / or combinations thereof.

[0024] like Figures 1 to 5 As shown, the present application discloses a screw main engine, including a cylinder 1, in which a screw rotor is installed, and an oil return hole 11, an oil inlet hole 12 and a connecting portion 13 are provided on the cylinder 1. The oil return hole 11 and the oil inlet hole 12 are connected through the connecting portion 13, and a first channel 14 is provided between the connecting portion 13 and the oil inlet hole 12. The connecting portion 13 is provided on the cylinder 1 to connect the oil return hole 11 and the oil inlet hole 12, and the oil inlet hole 12 is connected to the oil return pipe, and the lubricating oil is transported to the oil inlet hole 12 through the oil return pipe, and the lubricating oil flows into the connecting portion 13 and the oil return hole 11 in sequence through the oil inlet hole 12 to form oil return, thereby ensuring the effective circulation and use of the lubricating oil, and the oil inlet hole 12 and the connecting portion 13 are connected through the first channel 14, and the lubricating oil in the oil inlet hole 12 enters the connecting portion 13 through the first channel 14; in the present application, the oil inlet hole 12 is preferably a secondary oil inlet hole 12, and the oil inlet hole 12 is preferably connected to the secondary oil return pipe; it should be noted that the appendix to this specification Figure 2 The dotted line in the figure indicates the oil return hole 11;

[0025] A one-way valve assembly 2 is installed in the connecting portion 13. The one-way valve assembly 2 is used to open and close the first channel 14. The one-way valve assembly 2 limits the lubricating oil from the first channel 14 to flow into the connecting portion 13 in one direction. The lubricating oil enters the first channel 14 through the oil inlet hole 12 to drive the one-way valve assembly 2 to open. The lubricating oil in the first channel 14 enters the connecting portion 13 and flows to the oil return hole 11 to form oil return. By installing the one-way valve assembly 2 capable of opening and closing the first channel 14 in the connecting portion 13, the one-way valve assembly 2 limits the lubricating oil to flow into the connecting portion 13 in one direction only from the first channel 14, thereby preventing The lubricating oil in the circulation part flows back to the first channel 14, affecting the operation of the screw main unit. The lubricating oil passes through the oil inlet hole 12 and the first channel 14 in sequence through the oil return pipe. The lubricating oil in the first channel 14 can drive the one-way valve assembly 2 to open, so that the lubricating oil can enter the connecting part 13 and the oil return hole 11 in one direction to form oil return. The connecting part 13 and the cylinder 1 are an integrally formed structure. By installing the one-way valve assembly 2 in the connecting part 13 to replace the conventional external one-way valve, the integration is higher, and there is no need to set up an external pipeline. The structure is simple, easy to assemble, and the cost is low.

[0026] More specifically, Figure 2 and Figure 4 As shown, the connecting portion 13 is provided with a cover body 3, and the cover body 3 is covered with the connecting portion 13 to form a cavity for accommodating the one-way valve assembly 2. The cover body 3 is arranged on the connecting portion 13, and the connecting portion 13 is covered with the cover body 3 to form a cavity for accommodating lubricating oil, and the one-way valve assembly 2 can be installed in the cavity, and the assembly structure is simple and reliable.

[0027] More specifically, Figure 2 and Figure 4 As shown, the one-way valve assembly 2 is installed in the cavity to separate the cavity into a first cavity 131 and a second cavity 132, the first cavity 131 is communicated with the first channel 14, the second cavity 132 is communicated with the oil return hole 11, the one-way valve assembly 2 is provided with a second channel 232, the first cavity 131 and the second cavity 132 are communicated with each other through the second channel 232, the cavity is separated into the first cavity 131 and the second cavity 132 by installing the one-way valve assembly 2, the first cavity 131 is communicated with the first channel 14, the second cavity 132 is communicated with each other through the second channel 232. 32 is connected to the oil return hole 11, and a second channel 232 connecting the first cavity 131 and the second cavity 132 is provided on the one-way valve assembly 2. The lubricating oil in the first channel 14 can drive the one-way valve assembly 2 to open and enter the first cavity 131. The lubricating oil in the first cavity 131 flows into the second cavity 132 and the oil return hole 11 through the second channel 232 to form return oil. The one-way valve assembly 2 is opened only by the lubricating oil in the first channel 14, which can prevent the lubricating oil from flowing back, and the lubricating oil flow path is smoother and more reliable.

[0028] More specifically, Figure 2 and Figure 4 As shown, the one-way valve assembly 2 includes a float 21, an elastic member 22 and a locking member 23 which are sequentially installed in the cavity. The locking member 23 is connected to the connecting portion 13 to separate the cavity into a first cavity 131 and a second cavity 132. The float 21 and the elastic member 22 are both installed in the first cavity 131. The locking member 23 is provided with a second channel 232 which connects the first cavity 131 and the second cavity 132. The one-way valve assembly 2 is composed of the float 21, the elastic member 22 and the locking member 23. The cavity is separated into a first cavity 131 and a second cavity 132 which are distributed up and down by the locking member 23. The float 21 and the elastic member 22 are both installed in the first cavity 131. The float 21 cooperates with the elastic member 22 to open and close the first channel 14 in one direction. The one-way valve assembly 2 has a simple and reliable structure and is easy to assemble.

[0029] More specifically, Figure 2 and Figure 4 As shown, one end of the elastic member 22 abuts against the locking member 23, and the other end of the elastic member 22 abuts against the floating ball 21. The floating ball 21 closes the first channel 14 under the action of the elastic member 22. The elastic member 22 is installed between the locking member 23 and the floating ball 21. The floating ball 21 is located at the interface between the first channel 14 and the first cavity 131. The floating ball 21 can open and close the first channel 14 under the action of the elastic member 22. When the lubricating oil enters the first channel 14 from the oil inlet hole 12, the lubricating oil acts The float 21 compresses the elastic member 22 and thus detaches from the interface between the first channel 14 and the first cavity 131. The lubricating oil can enter the first cavity 131 and flow through the second channel 232, the second cavity 132 and the oil return hole 11 in sequence to complete the oil return. When the lubricating oil stops entering the oil inlet hole 12, the float 21 is reset under the action of the elastic member 22 to close the interface between the first channel 14 and the first cavity 131 to prevent the lubricating oil from flowing back. The one-way valve assembly 2 has a simple and reliable structure.

[0030] More specifically, Figure 2 and Figure 4 As shown, the locking member 23 is provided with a mounting groove 231 adapted to the elastic member 22, and the elastic member 22 is installed and limited in the mounting groove 231. By setting the mounting groove 231 in the locking member 23, the locking member 23 installs the limiting elastic member 22 through the mounting groove 231, which can prevent the elastic member 22 from shifting in the first cavity 131 and affecting the performance of the one-way valve assembly 2, and the assembly structure is more reliable.

[0031] More specifically, Figure 2 and Figure 4As shown, the second channel 232 is a through hole arranged on the locking member 23, and the through hole is connected to the mounting groove 231. The second channel 232 is set as a through hole on the locking member 23, and the through hole is connected to the mounting groove 231 and the second cavity 132, so that the lubricating oil in the first cavity 131 passes through the mounting groove 231 and the through hole to the second cavity 132, and the through hole structure is simple.

[0032] More specifically, Figure 2 and Figure 4 As shown, the elastic member 22 is a spring, and the locking member 23 is a bolt structure. The elastic member 22 is a spring, and the locking member 23 is a bolt structure. The structure is simple and reliable, and the one-way valve assembly 2 has a low cost.

[0033] More specifically, Figure 2 and Figure 4 As shown, the locking member 23 is connected to the connecting portion 13 by internal and external threads, and the locking member 23 and the connecting portion 13 are set to be threadedly connected and limited, so the assembly of the locking member 23 is simple and reliable.

[0034] More specifically, Figure 2 and Figure 4 As shown, the connecting portion 13 is detachably connected with an oil sight glass, which is configured as the cover body 3. The connecting portion 13 is provided with an oil sight glass, and the oil sight glass is connected to the connecting portion 13 as the cover body 3. The second cavity 132 can be used as an oil sight glass, so that the operator can also see the situation in the connecting portion 13 through the oil sight glass, which is convenient for timely maintenance. In addition, the oil sight glass is detachably connected to the connecting portion 13, so that the operator can disassemble and assemble the one-way valve assembly 2, which is more practical.

[0035] The present application is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of products under the inspiration of the present application. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present application.

Claims

1. A screw main engine, comprising a cylinder (1), wherein a screw rotor is installed in the cylinder (1), characterized in that: The cylinder (1) is provided with an oil return hole (11), an oil inlet hole (12) and a connecting portion (13); the oil return hole (11) and the oil inlet hole (12) are connected via the connecting portion (13); a first channel (14) is provided between the connecting portion (13) and the oil inlet hole (12); a one-way valve assembly (2) is installed in the connecting portion (13); the one-way valve assembly (2) is used to open and close the first channel (14); the one-way valve assembly (2) limits lubricating oil from the first channel (14) to flow into the connecting portion (13) in one direction; the lubricating oil enters the first channel (14) through the oil inlet hole (12) to drive the one-way valve assembly (2) to open; the lubricating oil in the first channel (14) enters the connecting portion (13) and flows to the oil return hole (11) to form oil return.

2. A screw main unit according to claim 1, characterized in that: The connecting portion (13) is provided with a cover body (3), and the cover body (3) covers the connecting portion (13) to form a cavity for accommodating the one-way valve assembly (2).

3. A screw main unit according to claim 2, characterized in that: The one-way valve assembly (2) is installed in the cavity to divide the cavity into a first cavity (131) and a second cavity (132); the first cavity (131) is connected to the first channel (14); the second cavity (132) is connected to the oil return hole (11); the one-way valve assembly (2) is provided with a second channel (232); the first cavity (131) and the second cavity (132) are connected via the second channel (232).

4. A screw main unit according to claim 2 or 3, characterized in that: The one-way valve assembly (2) comprises a float (21), an elastic member (22) and a locking member (23) which are sequentially installed in the cavity; the locking member (23) is connected to the connecting portion (13) to separate the cavity into a first cavity (131) and a second cavity (132); the float (21) and the elastic member (22) are both installed in the first cavity (131); and the locking member (23) is provided with a second channel (232) which connects the first cavity (131) and the second cavity (132).

5. A screw main unit according to claim 4, characterized in that: One end of the elastic member (22) abuts against the locking member (23), and the other end of the elastic member (22) abuts against the floating ball (21). The floating ball (21) closes the first channel (14) under the action of the elastic member (22).

6. A screw main unit according to claim 4, characterized in that: The locking member (23) is provided with a mounting groove (231) adapted to the elastic member (22), and the elastic member (22) is installed and limited in the mounting groove (231).

7. The screw main unit according to claim 6, characterized in that: The second channel (232) is a through hole provided on the locking member (23), and the through hole is communicated with the mounting groove (231).

8. The screw main unit according to claim 4, characterized in that: The elastic member (22) is a spring, and the locking member (23) is a bolt structure.

9. The screw main unit according to claim 4, characterized in that: The locking piece (23) is connected to the connecting portion (13) by internal and external threads.

10. The screw main unit according to claim 2, characterized in that: The connecting portion (13) is detachably connected to an oil sight glass, and the oil sight glass is configured as the cover body (3).

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