An oil injector

Abstract

The present invention discloses an oil injector, belonging to the technical field of power machinery. The oil injector includes an oil inlet oil path, an oil injection oil path assembly, a pressure regulating assembly, and a control oil path assembly. The oil inlet oil path is used to introduce external lubricating oil; one end of the oil injection oil path assembly can be communicated with the oil inlet oil path, and the other end is used to inject oil into the equipment that needs lubrication. The oil injection oil path assembly is configured to be communicated only when the oil pressure value in the oil injection oil path assembly reaches a preset value, and the oil pressure value of the lubricating oil in the oil inlet oil path is lower than the preset value; the pressure regulating assembly is arranged between the oil inlet oil path and the oil injection oil path assembly, and the pressure regulating assembly is configured to increase the pressure of the lubricating oil in the oil injection oil path assembly; the control oil path assembly is used to drive the pressure regulating assembly to increase the pressure of the lubricating oil in the oil injection oil path assembly. This oil injector does not require an oil injection pump to increase the pressure of the lubricating oil in the oil injector, saving costs and simplifying the system structure.

Description

Technical Field

[0001] The present invention relates to the technical field of power machinery, and particularly to an oil injector. Background Art

[0002] For reciprocating power machinery, such as large reciprocating compressors, internal combustion engines, etc., due to the wear of moving parts caused by high-speed and high-frequency operation, the service performance and life of the equipment will decrease sharply. Therefore, in order to improve the friction and wear conditions of moving parts, an independent oil injection lubrication system is usually designed to inject oil for forced lubrication of the friction surfaces of moving parts. Since lubricating oil usually cannot be recycled after use or is directly burned, for the cylinder lubrication system, in addition to requiring reliable operation, the consumption of cylinder lubricating oil has also received increasing attention.

[0003] For traditional oil injectors, an oil injection pump is required to increase the pressure of the lubricating oil in the oil injector, and then the lubricating oil in the oil injector is injected into the cylinder. However, the method of increasing pressure by using an oil injection pump has a high cost and a complex structure of the oil injection system.

[0004] Therefore, there is an urgent need for an oil injector that does not require an oil injection pump to increase pressure to solve the above technical problems existing in the prior art. Summary of the Invention

[0005] The purpose of the present invention is to provide an oil injector that does not require an oil injection pump to increase the pressure of the lubricating oil in the oil injector, saves costs, and simplifies the system structure.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] An oil injector, comprising:

[0008] An oil inlet oil path for introducing external lubricating oil;

[0009] An oil injection oil path assembly, one end of which can be connected to the oil inlet oil path, and the other end is used for injecting oil into the equipment that needs lubrication. The oil injection oil path assembly is configured to be connected only when the oil pressure value in the oil injection oil path assembly reaches a preset value, and the oil pressure value of the lubricating oil in the oil inlet oil path is lower than the preset value;

[0010] A pressure regulating assembly disposed between the oil inlet oil path and the oil injection oil path assembly, and the pressure regulating assembly is configured to be able to increase the pressure of the lubricating oil in the oil injection oil path assembly;

[0011] A control oil path assembly for driving the pressure regulating assembly to increase the pressure of the lubricating oil in the oil injection oil path assembly.

[0012] As a preferred technical solution of an oil injector, the pressure regulating assembly includes a sliding piston and a sliding block. The sliding piston includes a first chamber, and the sliding block is slidably connected in the first chamber. The oil inlet passage can communicate with one end of the oil injection passage assembly through the first chamber. The sliding block can seal or open the oil outlet of the oil inlet passage. The control oil passage assembly is used to drive the sliding piston to move linearly toward the side close to the oil injection passage assembly to pressurize the lubricating oil in the oil injection passage assembly.

[0013] As a preferred technical solution of an oil injector, a second chamber is provided between the oil inlet passage and the oil injection passage assembly. The sliding piston is disposed in the second chamber and can slide linearly between the oil inlet passage and the oil injection passage assembly. The space from the bottom of the sliding piston to the bottom of the second chamber is an oil storage chamber, and the oil storage chamber communicates with the first chamber and the oil injection passage assembly. When the sliding piston moves linearly toward the side close to the oil injection passage assembly, the volume of the oil storage chamber gradually decreases.

[0014] As a preferred technical solution of an oil injector, the oil injector further includes a limiting portion for limiting the extreme position of the sliding piston moving toward the side close to the oil injection passage assembly; the sliding block is configured to be able to seal the oil outlet of the oil inlet passage before the sliding piston moves to the extreme position.

[0015] As a preferred technical solution of an oil injector, an annular groove is provided at the top of the sliding piston. The lubricating oil in the control oil passage assembly can enter the annular groove to drive the sliding piston to move, and the oil pressure value of the lubricating oil in the control oil passage assembly is greater than the preset value.

[0016] As a preferred technical solution of an oil injector, the sliding block includes a frustum structure, and the end with a smaller diameter in the frustum structure is configured to be able to extend into the oil outlet of the oil inlet passage to block or open the oil outlet of the oil inlet passage.

[0017] As a preferred technical solution of an oil injector, the control oil passage assembly includes a control oil passage and a proportional valve. The control oil passage is used to introduce lubricating oil, and the proportional valve is disposed on the control oil passage.

[0018] As a preferred technical solution of an oil injector, the proportional valve is an electromagnetic proportional valve or a servo valve.

[0019] As a preferred technical solution of an oil injector, the oil injection oil circuit assembly includes an oil injection oil circuit and a pressure control valve. The pressure control valve is disposed on the oil injection oil circuit and is configured to open when the oil pressure value of the lubricating oil in the oil injection oil circuit reaches the preset value.

[0020] As a preferred technical solution of an oil injector, the pressure control valve includes a check valve.

[0021] The present invention provides an oil injector, which includes an oil inlet oil circuit, an oil injection oil circuit assembly, a pressure regulating assembly, and a control oil circuit assembly. Among them, the oil injection oil circuit assembly is configured to be connected only when the oil pressure value in the oil injection oil circuit assembly reaches a preset value. Therefore, if it is necessary to connect the oil injection oil circuit assembly to inject oil into the equipment, it is necessary to increase the pressure of the lubricating oil in the oil injection oil circuit assembly; the pressure regulating assembly is disposed between the oil inlet oil circuit and the oil injection oil circuit assembly, and the control oil circuit assembly drives the pressure regulating assembly to increase the pressure of the lubricating oil in the oil injection oil circuit assembly. When the oil pressure value in the oil injection oil circuit assembly reaches the preset value, the oil injection oil circuit assembly is connected and starts to inject oil into the equipment. The oil injector in the present invention does not need to use an oil injection pump, and only needs the control oil circuit assembly to increase the pressure of the lubricating oil in the oil injection oil circuit assembly, saving costs and simplifying the system structure. Description of the Drawings

[0022] Figure 1 is a cross-sectional view of the oil injector in the initial state provided by the specific embodiment of the present invention;

[0023] Figure 2 is a cross-sectional view of the oil injector in the normal working state provided by the specific embodiment of the present invention;

[0024] Figure 3 is a cross-sectional view of the oil injector in the self-protection state provided by the specific embodiment of the present invention.

[0025] 1. Oil inlet oil circuit; 2. Oil injection oil circuit assembly; 21. Oil injection oil circuit; 22. Pressure control valve; 3. Pressure regulating assembly; 31. Sliding piston; 311. First chamber; 32. Sliding block; 4. Control oil circuit assembly; 41. Control oil circuit; 42. Proportional valve; 5. Second chamber; 51. Oil storage chamber. Detailed Embodiment

[0026] To make the technical problems solved by the present invention, the technical solutions adopted, and the achieved technical effects clearer, the technical solutions of the present invention will be further described below with reference to the drawings and through specific embodiments.

[0027] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0028] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0029] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "left", and "right" are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0030] As Figures 1 to 3 shown, this embodiment provides an oil injector, which includes an oil inlet pipeline 1, an oil injection pipeline assembly 2, a pressure regulating assembly 3, and a control pipeline assembly 4. Among them, the oil inlet pipeline 1 is used to introduce external lubricating oil; one end of the oil injection pipeline assembly 2 can be connected to the oil inlet pipeline 1, and the other end is used to inject oil into the equipment that needs lubrication. The oil injection pipeline assembly 2 is configured to be connected only when the oil pressure value in the oil injection pipeline assembly 2 reaches a preset value, and the oil pressure value of the lubricating oil in the oil inlet pipeline 1 is lower than the preset value; the pressure regulating assembly 3 is arranged between the oil inlet pipeline 1 and the oil injection pipeline assembly 2, and the pressure regulating assembly 3 is configured to be able to increase the pressure of the lubricating oil in the oil injection pipeline assembly 2; the control pipeline assembly 4 is used to drive the pressure regulating assembly 3 to increase the pressure of the lubricating oil in the oil injection pipeline assembly 2.

[0031] The oil injection oil circuit assembly 2 is configured to be connected only when the oil pressure value in the oil injection oil circuit assembly 2 reaches a preset value. Therefore, if the oil injection oil circuit assembly 2 is to be connected to inject oil into a device (such as a cylinder), it is necessary to increase the pressure of the lubricating oil in the oil injection oil circuit assembly 2. The pressure regulating assembly 3 is arranged between the oil inlet oil circuit 1 and the oil injection oil circuit assembly 2. The control oil circuit assembly 4 drives the pressure regulating assembly 3 to increase the pressure of the lubricating oil in the oil injection oil circuit assembly 2. When the oil pressure value in the oil injection oil circuit assembly 2 reaches the preset value, the oil injection oil circuit assembly 2 is connected and starts to inject oil into the device. In this embodiment, the oil injector does not need to use an oil injection pump, and only the control oil circuit assembly 4 is required to increase the pressure of the lubricating oil in the oil injection oil circuit assembly 2, saving costs and simplifying the system structure. Preferably, in this embodiment, the oil pressure value of the lubricating oil in the oil inlet oil circuit 1 is 4 bar to 6 bar.

[0032] Specifically, the pressure regulating assembly 3 includes a sliding piston 31 and a sliding block 32. The sliding piston 31 includes a first chamber 311. The sliding block 32 is slidably connected in the first chamber 311. The oil inlet oil circuit 1 can be connected to one end of the oil injection oil circuit assembly 2 through the first chamber 311. The sliding block 32 can block or open the oil outlet of the oil inlet oil circuit 1. The control oil circuit assembly 4 is used to drive the sliding piston 31 to move linearly towards the side close to the oil injection oil circuit assembly 2 to increase the pressure of the lubricating oil in the oil injection oil circuit assembly 2. During the process of increasing the pressure of the lubricating oil in the oil injection oil circuit assembly 2, since the first chamber 311 is connected to the oil injection oil circuit assembly 2, when the oil pressure in the oil injection oil circuit assembly 2 increases, the sliding block 32 will move towards the side close to the oil inlet oil circuit 1. As the oil pressure value in the oil injection oil circuit assembly 2 rises, the sliding block 32 will block the oil outlet of the oil inlet oil circuit 1, and when the oil pressure value in the oil injection oil circuit assembly 2 reaches the preset value, the oil injection oil circuit assembly 2 is connected and starts to inject oil into the device. In this embodiment, an annular channel is formed between the sliding block 32 and the inner wall of the first chamber 311, and the oil inlet oil circuit 1 can be connected to one end of the oil injection oil circuit assembly 2 through the annular channel.

[0033] Preferably, a second chamber 5 is provided between the oil inlet pipeline 1 and the oil injection pipeline assembly 2. A sliding piston 31 is disposed in the second chamber 5 and can slide linearly between the oil inlet pipeline 1 and the oil injection pipeline assembly 2. The bottom of the sliding piston 31 to the bottom of the second chamber 5 forms an oil storage chamber 51. The oil storage chamber 51 is communicated with the first chamber 311 and the oil injection pipeline assembly 2. When the sliding piston 31 moves linearly toward the side close to the oil injection pipeline assembly 2, the volume of the oil storage chamber 51 gradually decreases, thereby playing a role in pressurizing the lubricating oil in the oil storage chamber 51. Since the oil storage chamber 51 is communicated with the first chamber 311 and the oil injection pipeline assembly 2, when the oil pressure value in the oil storage chamber 51 rises, the oil pressure values in the first chamber 311 and the oil injection pipeline assembly 2 will also rise accordingly, so that the sliding block 32 moves upward to block the oil outlet of the oil inlet pipeline 1 and the oil pressure value in the oil injection pipeline assembly 2 reaches a preset value, and the oil injection pipeline assembly 2 is communicated and starts to inject oil into the equipment. Optionally, in other embodiments, the oil storage chamber 51 may not be provided, and the sliding piston 31 is directly extended into the oil injection pipeline assembly 2 to reduce the volume of the lubricating oil accommodated in the oil injection pipeline assembly 2, so as to achieve the purpose of pressurizing the lubricating oil in the oil injection pipeline assembly 2.

[0034] It should be noted that in this embodiment, by the movement of the sliding piston 31, either by reducing the volume of the lubricating oil accommodated in the oil injection pipeline assembly 2 or by reducing the volume of the area communicated with the oil injection pipeline assembly 2, the purpose of pressurizing the lubricating oil in the oil injection pipeline assembly 2 is achieved. Therefore, any improvement to the pressure regulating assembly 3 to achieve the purpose of pressurizing the lubricating oil in the oil injection pipeline assembly 2 as desired in this embodiment in the above manner is within the protection scope of this case.

[0035] Preferably, the oil injector further includes a limiting portion for limiting the extreme position of the sliding piston 31 moving towards the oil injection oil circuit assembly 2; the sliding block 32 is configured to block the oil outlet of the oil inlet oil circuit 1 before the sliding piston 31 moves to the extreme position. When the sliding piston 31 moves and abuts against the limiting portion, the sliding piston 31 can no longer move towards the side of the oil injection oil circuit assembly 2, that is, the sliding piston 31 can no longer continue to boost the lubricating oil in the oil injection oil circuit assembly 2. In other words, when the sliding piston 31 moves to the limiting portion, the oil pressure value in the oil injection oil circuit assembly 2 reaches the maximum. The main purpose is to avoid that when the control oil circuit assembly 4 fails and cannot stop driving the sliding piston 31, the sliding piston 31 keeps moving downward. Since the sliding block 32 has blocked the outlet of the oil inlet oil circuit 1 when the sliding piston 31 moves to the extreme position, there is no low-pressure oil from the oil inlet oil circuit 1 entering the oil injection oil circuit assembly 2, and the lubricating oil quantity in the oil injection oil circuit assembly 2 reaches the maximum value. As the oil injection oil circuit assembly 2 injects oil into the equipment, the pressure in the oil injection oil circuit assembly 2 will gradually decrease until the oil pressure value in the oil injection oil circuit assembly 2 is lower than the preset value, thus effectively avoiding abnormal oil injection.

[0036] In this embodiment, the limiting portion is the sliding piston 31 itself. Since the diameter of the sliding piston 31 is larger than the diameter of the oil inlet of the oil injection oil circuit assembly 2, when the sliding piston 31 moves to the oil inlet of the oil injection oil circuit assembly 2, the sliding piston 31 no longer moves, thus reaching its extreme position. Optionally, in other embodiments, the limiting portion can be a limiting pin provided on the side wall of the second chamber 5, etc. Its specific structure only needs to be able to limit the movement of the sliding piston 31, so as to realize the self-protection function of the oil injector and avoid the problem of continuous oil injection when the control oil circuit assembly 4 has problems.

[0037] Preferably, an annular groove is provided at the top of the sliding piston 31, and the lubricating oil in the control oil circuit assembly 4 can enter the annular groove to drive the sliding piston 31 to move, and the oil pressure value of the lubricating oil in the control oil circuit assembly 4 is greater than the preset value. The cross-sectional shape of the annular groove can be arc-shaped, rectangular or any irregular shape. The main purpose is to enable the high-pressure lubricating oil in the control oil circuit assembly 4 to drive the sliding piston 31 to move. In this embodiment, the oil pressure value of the lubricating oil in the control oil circuit assembly 4 is 45 bar to 55 bar.

[0038] Preferably, the sliding block 32 includes a frustum structure. The end with a smaller diameter in the frustum structure is configured to be able to extend into the oil outlet of the oil inlet passage 1 to block or open the oil outlet of the oil inlet passage 1. The design of the frustum structure can not only play a guiding role to enable the frustum structure to smoothly extend into the oil outlet of the oil inlet passage 1 to block the oil outlet of the oil inlet passage 1, but also the blocking effect is better than directly blocking the oil outlet of the oil inlet passage 1 outside the oil outlet of the oil inlet passage 1.

[0039] As Figures 1 to 3 shown, the control oil passage assembly 4 includes a control oil passage 41 and a proportional valve 42. The control oil passage 41 is used to introduce lubricating oil, and the proportional valve 42 is arranged on the control oil passage 41. Preferably, in this embodiment, the proportional valve 42 is an electromagnetic proportional valve or a servo valve. Under normal working conditions, when the oil injector needs to work under the condition of a small oil injection volume, at this time, according to the demand of the oil injection volume, the energization time of the proportional valve 42 should be shortened, and at the same time, the opening degree of the proportional valve 42 should be reduced, and the power supply should be stopped before the lubricating oil in the oil injection passage assembly 2 reaches the maximum pressure; when the oil injector needs to work under the condition of a large oil injection volume, the energization time of the proportional valve 42 should be extended, and the opening degree of the proportional valve 42 should be adjusted to the maximum, so as to achieve the purpose of obtaining the highest oil injection pressure and accelerating the response speed. Thus, it can be seen that the proportional valve 42 can flexibly adjust the injection volume of the lubricating oil in the control oil passage 41 according to the demand of the oil injection volume, avoiding the problems of insufficient or excessive oil supply, and improving the utilization rate of the lubricating oil. Using the proportional valve 42 for control significantly improves the system response speed. Therefore, the oil injector provided in this embodiment has the advantage of a wide application range. The control oil passage assembly 4 and the pressure regulating assembly 3 in this embodiment have simple structures and low costs.

[0040] As Figures 1 to 3 shown, the oil injection passage assembly 2 includes an oil injection passage 21 and a pressure control valve 22. The pressure control valve 22 is arranged on the oil injection passage 21 and is configured to open when the oil pressure value of the lubricating oil in the oil injection passage 21 reaches a preset value. Preferably, in this embodiment, the pressure control valve 22 includes a check valve.

[0041] The above content is only a preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. The content of this specification should not be construed as a limitation to the present invention.

Claims

1. An oil injector, characterized in that, Comprising: An oil inlet pipeline (1) for introducing external lubricating oil. An oil injection pipeline assembly (2), one end of which can be connected to the oil inlet pipeline (1), and the other end is used for injecting oil into the equipment that needs lubrication. The oil injection pipeline assembly (2) is configured to be connected only when the oil pressure value in the oil injection pipeline assembly (2) reaches a preset value, and the oil pressure value of the lubricating oil in the oil inlet pipeline (1) is lower than the preset value. A pressure regulating assembly (3) provided between the oil inlet pipeline (1) and the oil injection pipeline assembly (2), and the pressure regulating assembly (3) is configured to be able to increase the pressure of the lubricating oil in the oil injection pipeline assembly (2). A control oil pipeline assembly (4) for driving the pressure regulating assembly (3) to increase the pressure of the lubricating oil in the oil injection pipeline assembly (2). The pressure regulating assembly (3) includes a sliding piston (31) and a sliding block (32). The sliding piston (31) includes a first chamber (311), and the sliding block (32) is slidably connected in the first chamber (311). The oil inlet pipeline (1) can be connected to one end of the oil injection pipeline assembly (2) through the first chamber (311). The sliding block (32) can block or open the oil outlet of the oil inlet pipeline (1), and the control oil pipeline assembly (4) is used to drive the sliding piston (31) to move linearly towards the side close to the oil injection pipeline assembly (2) to increase the pressure of the lubricating oil in the oil injection pipeline assembly (2). A second chamber (5) is provided between the oil inlet pipeline (1) and the oil injection pipeline assembly (2). The sliding piston (31) is arranged in the second chamber (5) and can slide linearly between the oil inlet pipeline (1) and the oil injection pipeline assembly (2). The bottom of the sliding piston (31) to the bottom of the second chamber (5) is an oil storage chamber (51), and the oil storage chamber (51) is connected to the first chamber (311) and the oil injection pipeline assembly (2). When the sliding piston (31) moves linearly towards the side close to the oil injection pipeline assembly (2), the volume of the oil storage chamber (51) gradually decreases. The oil injector further includes a limiting portion for limiting the extreme position of the sliding piston (31) moving towards the side close to the oil injection pipeline assembly (2); the sliding block (32) is configured to be able to block the oil outlet of the oil inlet pipeline (1) before the sliding piston (31) moves to the extreme position.

2. The oil injector according to claim 1, wherein, An annular groove is provided at the top of the sliding piston (31), and the lubricating oil in the control oil pipeline assembly (4) can enter the annular groove to drive the sliding piston (31) to move. The oil pressure value of the lubricating oil in the control oil pipeline assembly (4) is greater than the preset value.

3. The oil injector according to claim 1, wherein, The sliding block (32) includes a frustum structure, and the end with a smaller diameter in the frustum structure is configured to be able to extend into the oil outlet of the oil inlet oil passage (1) to block or open the oil outlet of the oil inlet oil passage (1).

4. The oil injector according to claim 1, characterized in that, The control oil passage assembly (4) includes a control oil passage (41) and a proportional valve (42). The control oil passage (41) is used for introducing lubricating oil, and the proportional valve (42) is arranged on the control oil passage (41).

5. The oil injector according to claim 4, wherein, The proportional valve (42) is an electromagnetic proportional valve or a servo valve.

6. The oil injector according to claim 1, wherein The oil injection oil passage assembly (2) includes an oil injection oil passage (21) and a pressure control valve (22). The pressure control valve (22) is arranged on the oil injection oil passage (21) and is configured to open when the oil pressure value of the lubricating oil in the oil injection oil passage (21) reaches the preset value.

7. The oil injector according to claim 6, characterized in that, The pressure control valve (22) includes a check valve.

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