Oil injection structure and oil injection method of compressor

Abstract

The invention provides an oil injection structure and an oil injection method of a compressor, the oil injection structure comprises: a cylinder body, the cylinder body is provided with an oil injection port, a vacuumizing port and a connecting port, the oil injection port is used for connecting an oil injection gun body, the vacuumizing port is used for connecting vacuumizing equipment, and the connecting port is used for connecting an oil inlet of the compressor; the valve body assembly comprises a valve rod and a valve body fixed to one end of the valve rod, the valve body can be contained in the cylinder body in a reciprocating motion mode, and the valve body is provided with a channel; the movable end of the driving unit is connected with the valve rod, and the driving unit is used for driving the valve rod to move in the axial direction of the cylinder body so as to drive the valve body to be switched between the first position and the second position of the cylinder body. When the valve body is located at the first position, the valve body is communicated with the connecting port through the channel vacuumizing port, and the valve body cuts off a passage between the oil filling port and the connecting port; and when the valve body is located at the second position, the oil filling port is communicated with the connecting port, and the valve body cuts off the passage between the vacuumizing port and the connecting port. The oil injection structure can greatly improve the oil injection efficiency of the compressor.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and more specifically, to an oil filling structure and method for a compressor. Background Technology

[0002] In the maintenance and upkeep of compressors, lubricating oil is a crucial step. Lubricating oil plays multiple key roles within the compressor system. Firstly, it forms a lubricating film between moving parts such as bearings, gears, and pistons, effectively reducing friction and wear. Secondly, it absorbs and transfers the heat generated during compressor operation, dissipating it through the circulating cooling system to control the compressor's temperature and prevent malfunctions caused by overheating. Furthermore, in some compressor designs, lubricating oil can also help form a sealing interface between the piston and cylinder wall, reducing compressed gas leakage and helping to maintain and improve compression efficiency.

[0003] Currently, compressor oil filling methods typically involve directly injecting oil into the compressor's oil inlet using an oil gun. In existing technology, the compressor oil filling structure usually separates the compressor's oil filling unit from an external three-way valve to achieve switching between oil filling and vacuuming functions. This approach has a significant drawback: the connecting pipeline between the external three-way valve and the compressor's discharge port is long, resulting in a large amount of refrigerant oil remaining in the gun and pipeline after the operation, causing oil waste and potential cross-contamination. Furthermore, the independent external three-way valve usually has a small valve core diameter, and the long pipeline results in high fluid resistance, severely restricting the flow rate of high-viscosity refrigerant oil, leading to low oil filling efficiency and prolonged maintenance time. In addition, the split structure increases the risk of interface leakage, reducing the overall reliability of the equipment.

[0004] Therefore, the oil filling structure of compressors needs improvement in terms of structural compactness, oil utilization rate, oil filling efficiency, and ease of operation. There is an urgent need for a new type of compressor oil filling structure with higher integration, shorter flow channels, and larger pipe diameter to address industry pain points such as excessive residual oil and slow oil filling speed.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0006] In view of the problems in the prior art, the purpose of this invention is to provide an oil injection structure and method for a compressor, which can improve the oil injection efficiency of the compressor while reducing the waste of compressor refrigeration oil.

[0007] Specifically, a first aspect of the present invention provides an oil injection structure for a compressor, comprising: The cylinder body is provided with an oil filling port, a vacuum port, and a connection port. The oil filling port is used to connect to the oil filling gun body, the vacuum port is used to connect to the vacuum equipment, and the connection port is used to connect to the oil inlet of the compressor. A valve body assembly includes a valve stem and a valve body fixed to one end of the valve stem, the valve body being reciprocally received within the cylinder, and the valve body being provided with a channel; A drive unit, the drive end of which is connected to the valve stem, is used to drive the valve stem to move axially along the cylinder body, so as to drive the valve body to switch between a first position and a second position in the cylinder body; When the valve body is in the first position, the vacuum port is connected to the connection port through the channel, and the valve body blocks the passage between the oil injection port and the connection port. When the valve body is in the second position, the oil inlet is connected to the connection port, and the valve body blocks the passage between the vacuum port and the connection port.

[0008] According to a first aspect of the invention, the drive unit is a cylinder, and the moving end of the cylinder is connected to the valve stem.

[0009] According to a first aspect of the invention, the connection port is disposed at one end of the cylinder body; The valve stem is slidably inserted through the other end of the cylinder body; The oil filling port is located on the cylinder body near the connection port, and the vacuum port is located on the cylinder body away from the connection port; The cylinder body includes a first cavity on the side of the connection port and a second cavity on the side of the vacuum port; The valve body is provided with a channel connecting the first cavity and the second cavity.

[0010] According to a first aspect of the invention, when the valve body is in the first position, one end of the channel near the connection port is connected to and communicates with the connection port, and the outer peripheral wall of the valve body seals the opening of the oil injection port on the inner wall of the cylinder body. When the valve body is in the second position, the port of the channel away from the connection port is sealed off, and the opening of the oil inlet on the inner wall of the cylinder body communicates with the first cavity.

[0011] According to a first aspect of the present invention, the valve stem is a hollow structure, and the oil injection structure further includes a sealing rod passing through the hollow structure; The end of the sealing rod facing away from the connection port is fixed; One end of the channel away from the connection port is connected to the cavity of the cylinder at that end of the valve body, and the other end is connected to the inner cavity of the hollow structure; The valve stem can reciprocate axially relative to the sealing rod, so that the end of the sealing rod near the connection port opens or blocks the opening of the channel connecting the hollow structure.

[0012] According to a first aspect of the invention, the fixed end of the sealing rod is provided with an elastic element, the elastic element being used to provide a preload force to the sealing rod toward the connection port.

[0013] According to a first aspect of the invention, an elastic sealing sleeve is provided on the outer periphery of one end of the sealing rod near the connection port.

[0014] According to a first aspect of the invention, the radial dimension of the first cavity is greater than the radial dimension of the second cavity.

[0015] According to a first aspect of the present invention, the oil injection structure further includes a solenoid valve disposed on the pipeline connecting the vacuum port and the vacuum equipment.

[0016] A second aspect of the present invention provides an oil injection method for a compressor, applied to an assembly line employing the oil injection structure of the compressor described in the first aspect. When the compressor is transported to the oil injection station, the oil injection method includes the following steps: S1: Connect the oil filling structure of the compressor to the oil inlet of the compressor, and the valve body of the oil filling structure of the compressor is in the first position; S2: The control drive unit switches the valve body to the second position and starts the oil injection gun to inject refrigeration oil into the compressor through the oil injection structure; S3: Monitor the oil injection volume and stop the oil injection gun when the oil injection volume reaches the set value; S4: The control drive unit switches the valve body back to the first position, performs a vacuuming operation on the compressor through the vacuum port of the oil injection structure and continues for a first set time, and then separates the connection port of the compressor's oil injection structure from the compressor's oil inlet.

[0017] The oil injection structure and method of the compressor of the present invention can greatly improve the oil injection speed of the compressor and reduce the waste of compressor refrigeration oil. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Other features, objects, and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without inventive effort. Furthermore, the drawings are merely illustrative diagrams of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. Some block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0019] Figure 1 and Figure 2 These are schematic diagrams of the oil injection structure of the compressor according to the first embodiment of the present invention under different states; Figure 3 and Figure 4 These are schematic diagrams of the oil injection structure of the compressor according to the second embodiment of the present invention under different states; Figure 5 This is a flowchart of an oil filling method for a compressor according to an embodiment of the present invention. Detailed Implementation

[0020] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present invention can be modified or changed according to different viewpoints and application systems without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0021] The present invention will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can readily implement it. The present invention can be embodied in many different forms and is not limited to the embodiments described herein.

[0022] In the representation of this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics represented in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. Furthermore, the specific features, structures, materials, or characteristics represented may be combined in any suitable manner in one or more embodiments or examples. Moreover, those skilled in the art can combine and integrate different embodiments or examples represented in this invention, as well as features of different embodiments or examples, without contradiction.

[0023] To clearly illustrate the present invention, components unrelated to the description are omitted, and the same or similar constituent elements throughout the specification are given the same reference numerals.

[0024] Throughout this specification, when it is said that a device is "connected" to another device, this includes not only "direct connection" but also "indirect connection" by placing other components in between. Furthermore, when it is said that a device "comprises" a certain constituent element, unless otherwise stated otherwise, this does not exclude other constituent elements, but rather implies that other constituent elements may be included.

[0025] When we say that a device is "above" another device, this can mean that it is directly above the other device, or it can mean that other devices are present in between. Conversely, when we say that a device is "directly" "above" another device, there are no other devices present in between.

[0026] Although the terms first, second, etc., are used in some instances herein to refer to various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, first interface and second interface, etc., are used. Furthermore, as used herein, the singular forms “a,” “an,” and “the” are intended to also include the plural forms unless the context indicates otherwise. It should be further understood that the terms “comprising,” “including,” indicate the presence of features, steps, operations, elements, components, items, kinds, and / or groups, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, kinds, and / or groups. The terms “or” and “and / or” as used herein are interpreted as inclusive, or mean any one or any combination thereof. Thus, “A, B, or C” or “A, B, and / or C” means “any one of: A; B; C; A and B; A and C; B and C; A, B, and C.” Exceptions to this definition will only occur if the combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.

[0027] The technical terms used herein are for reference only to specific embodiments and are not intended to limit the invention. The singular form used herein includes the plural form unless the statement explicitly indicates otherwise. The word "comprising" as used in this specification means to specify a particular characteristic, region, integer, step, operation, element, and / or component, and does not exclude the presence or addition of other characteristics, regions, integers, steps, operations, elements, and / or components.

[0028] Although not fully defined, all terms, including technical and scientific terms used herein, shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms defined in commonly used dictionaries shall be further interpreted as having a meaning consistent with relevant technical literature and the content of this present instruction, and shall not be over-interpreted as having an ideal or overly formulaic meaning unless otherwise defined.

[0029] The oil injection structure and oil injection method of the compressor of the present invention are further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments are not intended to limit the scope of protection of the present invention.

[0030] This invention provides an oil injection structure for a compressor. Figure 1 and Figure 2 These are schematic diagrams showing the oil injection structure of the compressor according to the first embodiment of the present invention under different states. Specifically, the oil injection structure includes: The cylinder body 1 is provided with an oil filling port 11, a vacuum port 12, and a connecting port 13. The oil filling port 11 is used to connect to the oil filling gun body, the vacuum port 12 is used to connect to the vacuuming equipment, and the connecting port 13 is used to connect to the oil inlet of the compressor. To improve sealing, a sealing gasket 131 can be provided at the mating surface between the connecting port 13 and the compressor oil inlet. Figure 3 or Figure 4 ).

[0031] The valve body assembly includes a valve stem 22a and a valve body 21a fixed to one end of the valve stem 22a. The valve body 21a is reciprocally accommodated within a cylinder 1 and has a channel 211a. In the first embodiment, a connection port 13 is located at one end of the cylinder 1 (e.g., the lower end); the valve stem 22a is slidably inserted through the other end of the cylinder 1 (e.g., the upper end).

[0032] A drive unit, whose drive end is connected to the other end of the valve stem 22a, is used to drive the valve stem 22a to move axially along the cylinder body 1, thereby causing the valve body 21a to switch between a first position and a second position on the cylinder body 1. In the first embodiment, the drive unit is a cylinder 3, and the moving end 31 of the cylinder 3 is fixedly connected to the valve stem 22a. The moving end 31 of the cylinder 3 can be the movable end of the piston rod of the cylinder.

[0033] When the valve body is in the first position, the vacuum port of the valve body is connected to the connection port, and the valve body isolates the passage between the oil inlet and the connection port; when the valve body is in the second position, the oil inlet is connected to the connection port, and the valve body isolates the passage between the vacuum port and the connection port.

[0034] Taking the first embodiment as an example, the oil inlet 11 is located on the cylinder body 1 near the connection port 13, and the vacuum port 12 is located on the cylinder body 1 away from the connection port 13. The cylinder body 1 includes a first cavity C1 on the side connected to the connection port 13 and a second cavity C2 on the side connected to the vacuum port 12. In this case, the valve body 21a is provided with a channel 211a extending through it in the axial direction, and the channel 211a connects the first cavity C1 and the second cavity C2. The radial dimension of the first cavity C1 is larger than the radial dimension of the second cavity C2. When both the first cavity C1 and the second cavity C2 are cylindrical, the radial dimensions of the first cavity C1 and the second cavity C2 are their diameters. In this embodiment, the valve body 21a is actually located inside the first cavity C1, and the structures at both ends of it fit with the two ends of the first cavity C1.

[0035] In the first embodiment, when the valve body 21a is in the first position, i.e., when the drive unit drives the valve body 21a to abut against one end of the connection port 13 (see Figure 1), the end of the channel 211a near the connection port 13 is connected to and communicates with the connection port 13, and the end of the channel 211a away from the connection port 13 is connected to the second cavity C2. More precisely, the end of the channel 211a away from the connection port 13 is connected to the first cavity C1 at that end, thereby connecting to the second cavity C2. At this time, the vacuum port 12 forms a fluid passage through the second cavity C2, the channel 211a, and the connection port 13. The compressor connected to the connection port 13 can be evacuated using a vacuuming device. In some embodiments, the oil injection structure also includes a solenoid valve (not shown in the figure), which is disposed on the pipeline connecting the vacuum port 12 and the vacuuming device. This solenoid valve can be used to depressurize the pipeline before vacuuming or to precisely control the start and stop of the vacuuming operation. At the same time, the outer peripheral wall of the valve body 21a seals the opening of the oil injection port 11 on the inner wall of the cylinder 1.

[0036] In the first embodiment, when the valve body 21a is in the second position, see Figure 2 The end of channel 211a furthest from connection port 13 is sealed off by the inner wall of the first cavity C1, thus cutting off the passage between vacuum port 12 and connection port 13. Simultaneously, the opening of oil inlet 11 on the inner wall of cylinder 1 connects to the first cavity C1. At this point, the external oil injection gun can be activated, allowing refrigerant oil to be injected into the compressor via oil inlet 11, the first cavity C1, and from connection port 13.

[0037] This embodiment achieves mechanical switching between oil injection and vacuuming pathways by moving the valve body 21a to two positions, resulting in a simple and reliable structure. Furthermore, by placing the oil injection port 11 as close as possible to the connection port 13, the oil injection path is effectively shortened. Testing has shown that the amount of refrigerant oil lost during the oil injection process of a single compressor can be significantly reduced from approximately 10 ml in the prior art to 3-5 ml.

[0038] Figure 3 and Figure 4 These are schematic diagrams of the compressor's oil injection structure under different states according to the second embodiment of the present invention. The main difference between the second embodiment and the first embodiment lies in the communication control method between the valve stem and the channel. In the second embodiment, the valve stem 22b is a hollow structure. The oil injection structure also includes a sealing rod 23b passing through the hollow structure, with one end of the sealing rod 23b fixed away from the connection port 13. One end of the channel 211b away from the connection port 13 is connected to the cavity of the cylinder 1 at that end of the valve body 21b, and the other end is connected to the inner cavity of the hollow structure. That is, one end opening D2 of the channel 211b is located on the end face of the valve body 21b away from the connection port 13, and the other end opening D1 is located inside the valve body 21b and is connected to the inner cavity of the hollow structure.

[0039] Valve stem 22b can reciprocate axially relative to sealing stem 23b, so that the end of sealing stem 23b near connection port 13 opens (see...). Figure 3 ) or block (see Figure 4 One end opening D1 of channel 211b connects to the opening of the hollow structure. In some embodiments, an elastic sealing sleeve 231b is provided on the outer periphery of the end of the sealing rod near the connection port 13 to enhance the sealing effect.

[0040] In the second embodiment, when the valve body 21b is in the first position, that is, when the drive unit drives the valve body 21b away from the fixed end of the sealing rod 23b and abuts against one end of the connection port 13, see Figure 3 The sealing end of the sealing rod 23b is above the opening D1 at one end of the channel 211b. The hollow structure of the opening D1 at the end of the channel 211b closest to the connection port 13 is connected to and communicates with the connection port 13. The opening D2 at the end of the channel 211b furthest from the connection port communicates with the first cavity C1 at that end, thereby communicating with the second cavity C2. The outer peripheral wall of the valve body 21b seals the opening of the oil inlet 11 on the inner wall of the cylinder body 1. At this time, the compressor connected to the connection port 13 can be evacuated using a vacuum pump.

[0041] In the second embodiment, when the valve body 21b is in the second position, that is, when the driving unit drives the valve body 21b to approach the fixed end of the sealing rod 23b, see... Figure 4The sealing end of the sealing rod 23b is at the opening D1 at one end of the channel 211b and blocks the opening of the channel 211b connecting the hollow structure, thus blocking the channel 211b between the vacuum port 12 and the connection port 13. At this time, the opening of the oil injection port 11 on the inner wall of the cylinder 1 is connected to the first chamber C1. At this time, the oil injection gun can be activated to inject refrigeration oil into the compressor through the oil injection structure.

[0042] Furthermore, an elastic element 24b is provided at the fixed end of the sealing rod 23b. The elastic element 24b is used to provide a preload force to the sealing rod 23b toward the connection port 13. By adjusting the parameters of the elastic element 24b, it is possible to adapt to drive units with different strokes, thereby enhancing the versatility of the structure.

[0043] The present invention also provides an oil injection method for a compressor, applicable to an assembly line employing the aforementioned oil injection structure of the compressor. Figure 5 This is a flowchart of a compressor oil filling method according to an embodiment of the present invention. Specifically, when the compressor is transported to the oil filling station, the oil filling method includes the following steps: Step S1: Connect the oil filling structure of the compressor to the oil inlet of the compressor, with the valve body of the oil filling structure in the first position; typically, step S1 includes lowering the oil filling structure to connect the oil filling structure to the oil inlet of the compressor.

[0044] Step S2: Control the drive unit to switch the valve body to the second position and start the oil injection gun to inject refrigeration oil into the compressor through the oil injection structure; in some embodiments, before step S2, step S11 may be included: perform a vacuuming operation on the compressor through the vacuum port of the oil injection structure and continue for a second set time, so that the compressor is under negative pressure, which makes it easier to inject refrigeration oil.

[0045] Step S3: Monitor the oil injection volume and stop the oil injection gun when the oil injection volume reaches the set value; Step S4: Control the drive unit to switch the valve body back to the first position, perform a vacuuming operation on the compressor through the vacuum port of the oil filling structure and continue for a first set time, then separate the connection port of the compressor's oil filling structure from the compressor's oil inlet to complete the filling of the compressor's cooling oil.

[0046] In an embodiment where a solenoid valve is installed on the pipeline connecting the vacuum port to the vacuum equipment, after the control drive unit in step S4 switches the valve body back to the first position, the pressure can be released through the solenoid valve before the compressor is vacuumed.

[0047] Of course, after step S4 completes the oiling of the compressor's cooling oil, the compressor can be moved out of the oiling station by the assembly line after the oiling structure is withdrawn from the oiling station. During the oiling process completed on the assembly line, the time for the oiling structure to descend and connect to the compressor to be oiled in step S1 is ~0.5 seconds, the oiling time in steps S2 and S3 is ~7 seconds, the pressure relief and vacuuming in step S4 is ~2 seconds, and finally, the oiling structure rises and is withdrawn, and the compressor moves out of the oiling station in ~0.5 seconds. A single oiling cycle can be completed within 10 seconds, a significant improvement compared to the existing 13-second oiling cycle. The oiling structure and method of the compressor of this invention can greatly improve the oiling speed of the compressor and increase its production efficiency.

[0048] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

[0049] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. An oil injection structure for a compressor, characterized in that, include: The cylinder body is provided with an oil filling port, a vacuum port, and a connection port. The oil filling port is used to connect to the oil filling gun body, the vacuum port is used to connect to the vacuum equipment, and the connection port is used to connect to the oil inlet of the compressor. A valve body assembly includes a valve stem and a valve body fixed to one end of the valve stem, the valve body being reciprocally received within the cylinder, and the valve body being provided with a channel; A drive unit, the drive end of which is connected to the valve stem, is used to drive the valve stem to move axially along the cylinder body, so as to drive the valve body to switch between a first position and a second position in the cylinder body; When the valve body is in the first position, the vacuum port is connected to the connection port through the channel, and the valve body blocks the passage between the oil injection port and the connection port. When the valve body is in the second position, the oil inlet is connected to the connection port, and the valve body blocks the passage between the vacuum port and the connection port.

2. The oil injection structure of the compressor according to claim 1, characterized in that, The drive unit is a cylinder, and the moving end of the cylinder is connected to the valve stem.

3. The oil injection structure of the compressor according to claim 1, characterized in that, The connection port is located at one end of the cylinder body; The valve stem is slidably inserted through the other end of the cylinder body; The oil filling port is located on the cylinder body near the connection port, and the vacuum port is located on the cylinder body away from the connection port; The cylinder body includes a first cavity on the side of the connection port and a second cavity on the side of the vacuum port; The valve body is provided with a channel connecting the first cavity and the second cavity.

4. The oil injection structure of the compressor according to claim 3, characterized in that, When the valve body is in the first position, the end of the channel near the connection port is connected to and communicates with the connection port, and the outer peripheral wall of the valve body seals the opening of the oil injection port on the inner wall of the cylinder body. When the valve body is in the second position, the port of the channel away from the connection port is sealed off, and the opening of the oil inlet on the inner wall of the cylinder body communicates with the first cavity.

5. The oil injection structure of the compressor according to claim 3, characterized in that, The valve stem has a hollow structure, and the oil injection structure also includes a sealing rod that passes through the hollow structure; The end of the sealing rod facing away from the connection port is fixed; One end of the channel away from the connection port is connected to the cavity of the cylinder at that end of the valve body, and the other end is connected to the inner cavity of the hollow structure; The valve stem can reciprocate axially relative to the sealing rod, so that the end of the sealing rod near the connection port opens or blocks the opening of the channel connecting the hollow structure.

6. The oil injection structure of the compressor according to claim 5, characterized in that, The fixed end of the sealing rod is provided with an elastic element, which is used to provide a pre-tightening force to the sealing rod toward the connection port.

7. The oil injection structure of the compressor according to claim 5, characterized in that, An elastic sealing sleeve is provided on the outer periphery of the end of the sealing rod near the connection port.

8. The oil injection structure of the compressor according to claim 3, characterized in that, The radial dimension of the first cavity is greater than the radial dimension of the second cavity.

9. The oil injection structure of the compressor according to claim 1, characterized in that, The oil injection structure also includes a solenoid valve, which is installed on the pipeline connecting the vacuum port and the vacuum equipment.

10. A method for injecting oil into a compressor, characterized in that, An assembly line employing the oil injection structure of a compressor according to any one of claims 1 to 9, wherein when the compressor is transported to the oil injection station, the oil injection method includes the following steps: S1: Connect the oil filling structure of the compressor to the oil inlet of the compressor, and the valve body of the oil filling structure of the compressor is in the first position; S2: The control drive unit switches the valve body to the second position and starts the oil injection gun to inject refrigeration oil into the compressor through the oil injection structure; S3: Monitor the oil injection volume and stop the oil injection gun when the oil injection volume reaches the set value; S4: The control drive unit switches the valve body back to the first position, performs a vacuuming operation on the compressor through the vacuum port of the oil injection structure and continues for a first set time, and then separates the connection port of the compressor's oil injection structure from the compressor's oil inlet.

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