Grease injection valve

Abstract

A kind of lubricating grease injection valve, including valve body, first spool structure, second spool structure, injection structure, valve body inside is provided with by air passage, first air passage, second air passage air passage, and by oil inlet channel, first oil channel, second oil channel oil channel, air passage, oil channel entrance respectively with compressed air connector, lubricating grease connector is connected, air passage, oil channel outlet all are connected with injection structure inside, and the on-off of gas path is controlled by the first spool structure being arranged in the first mounting hole, and the on-off of oil path is controlled by the second spool structure being arranged in the second mounting hole.The design is controlled by second spool structure first to open gas path, then by second spool structure control oil path opens, finally compressed air, lubricating grease together enters injection structure inside by injection structure and is sprayed, avoid the waste of lubricating grease and compressed air.

Description

Technical Field

[0001] This invention belongs to the field of automatic lubrication system technology, specifically relating to a grease injection valve, which is suitable for avoiding the waste of compressed air and grease. Background Technology

[0002] Since the gear and rack lifting system is an open gear transmission system, it usually requires the installation of an automatic lubrication system to lubricate the transmission pinion. Existing automatic lubrication systems typically use a lubrication pump to deliver grease through pipelines to the injection valve. Compressed air and grease are mixed in the injection valve, and the pressure of the compressed air is used to spray the grease onto the gear surface that needs lubrication.

[0003] Chinese Patent Application No. 202211189169.7 discloses an injection valve, which includes a valve body, a valve core structure, and an injection structure. The valve body has a connecting channel, an oil inlet channel, an air inlet channel, an oil injection channel, and an air injection channel. Through the valve core structure, which is movably set in the connecting channel and has two states, compressed air can be introduced into the injection valve at the same time as lubricating grease is introduced to spray out lubricating grease. The lubricating grease and compressed air are interlocked to avoid the problem of compressed air being wasted when only one injection valve outputs lubricating grease at the same time, while all injection valves are spraying compressed air. However, this injection valve locks the air with lubricating grease, that is, when the lubricating grease pressure reaches a certain value, the air passage is opened and the compressed air sprays the lubricating grease to the lubrication point. There is a problem that the lubricating grease may drip out through the nozzle before the air passage is opened, causing lubricating grease waste and environmental pollution. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned problems existing in the prior art and to provide a grease injection valve that can avoid the waste of compressed air and grease.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A grease injection valve includes a valve body and an injection structure. The valve body has an air inlet channel, an oil inlet channel, a first mounting hole, a second mounting hole, a first air passage, a first oil passage, a second air passage, and a second oil passage inside. The inlet of the air inlet channel is connected to the outside of the valve body. The inlet and outlet of the oil inlet channel are connected to the outside of the valve body and the inside of the first mounting hole B, respectively. The inlet and outlet of the first air passage are connected to the inside of the first mounting hole A and the inside of the second mounting hole A, respectively. The inlet of the first oil passage is connected to the inside of the first mounting hole B. The outlet of the second air passage is connected to the inside of the injection structure. The outlet and outlet of the second oil passage are connected to the inside of the second mounting hole B and the inside of the injection structure, respectively. The injection structure is disposed on the valve body and is used to simultaneously inject compressed air and grease.

[0007] The grease injection valve further includes a first valve core structure disposed inside a first mounting hole and a second valve core structure disposed inside a second mounting hole. Both the first valve core structure and the second valve core structure have a first state and a second state. When the first valve core structure is in the first state, it is used to disconnect the air intake channel outlet from the interior of the first mounting hole A end. When the first valve core structure is in the second state, it is used to connect the air intake channel outlet with the interior of the first mounting hole A end. When the second valve core structure is in the first state, it is used to disconnect the second air passage inlet from the interior of the second mounting hole A end and the first oil passage outlet from the interior of the second mounting hole B end. When the second valve core structure is in the second state, it is used to connect the second air passage inlet from the interior of the second mounting hole A end and the first oil passage outlet from the interior of the second mounting hole B end.

[0008] The first valve core structure is in a first state when the pressure inside the oil inlet channel is less than a first preset value, and in a second state when the pressure reaches the first preset value.

[0009] The second valve core structure is in a first state when the pressure inside the intake channel is less than a second preset value, and in a second state when the pressure reaches the second preset value.

[0010] The first valve core structure includes a first valve seat, a first valve core, and a first valve stem. The first valve seat and the first valve core are both hollow structures with one open end. The first valve seat is located inside the first mounting hole A end, and an air inlet is provided on it at the position corresponding to the air inlet channel outlet. The first valve core is located inside the open end of the first valve seat, and its inner wall slides with the outer wall of the first valve core. A first spring is provided inside its open end, which abuts against the first valve seat. One end of the first valve stem is inserted into the first valve seat from the open end of the first valve seat and abuts against the other end of the first valve core. Its middle outer wall slides with the middle outer wall of the first mounting hole, and its other end is inserted into the first mounting hole B end.

[0011] When the first valve core structure is in the first state, the air inlet is blocked by the outer wall of the first valve core.

[0012] When the first valve core structure is in the second state, the first valve stem pushes the first valve core to compress the first spring and move it away from the first mounting hole B end, so that the outlet of the air intake channel is connected to the inside of the first valve seat through the air intake hole.

[0013] The first valve seat includes a first valve sleeve and a first spring seat. The first valve sleeve is a hollow structure with openings at both ends. Its outer wall is threaded to the inner wall of the first mounting hole A. The inner wall of one opening is threaded to the first spring seat. One end of the first spring is located inside the opening of the first valve core, and the other end is sleeved on the outside of the first fixing post provided on the first spring seat. A first inclined surface is provided on the other end of the first valve core. When the first valve core structure is in the first state, the first inclined surface is sealed and engaged with a second inclined surface provided on the inner wall of the first valve sleeve. The air inlet is opened on the first valve sleeve, and the second inclined surface is located on the side of the air inlet near the first valve stem.

[0014] The first valve stem includes a first end rod, a first intermediate rod, and a second end rod. One end of the first end rod abuts against the other end of the first valve core, and the other end of the first end rod passes through the opening end of the first valve sleeve away from the first spring seat and is fixedly connected to one end of the first intermediate rod. The side wall of the first intermediate rod slides in fit with the inner wall of the middle part of the first mounting hole. A second sealing ring is provided on the side wall of the first intermediate rod. The other end of the first intermediate rod is fixedly connected to one end of the second end rod. The other end of the second end rod abuts against the first screw plug provided inside the B end of the first mounting hole. The outer diameters of the first end rod and the second end rod are equal, and the outer diameters of the first end rod and the second end rod are both smaller than the outer diameter of the first intermediate rod.

[0015] The second valve core structure includes a second valve seat, a second valve core, and a second valve stem. Both the second valve seat and the second valve core are hollow structures with one open end. The second valve seat is located inside the B end of the second mounting hole, and an oil inlet hole is opened on it at the position corresponding to the outlet of the first oil passage. The second valve core is located inside the open end of the second valve seat, and its outer wall slides with the inner wall of the second valve seat. A first sealing ring is provided on its outer wall, and a second spring is provided inside its open end to abut against the second valve seat. One end of the second valve stem is inserted into the second valve seat from the open end of the second valve seat and abuts against the other end of the second valve core. Its middle outer wall slides with the middle outer wall of the second mounting hole, and its other end is inserted into the A end of the second mounting hole.

[0016] When the second valve core structure is in the first state, the oil inlet is blocked by the outer wall of the second valve core, and the inlet of the second air passage is blocked by the outer wall of the middle part of the second valve stem;

[0017] When the second valve core structure is in the second state, the second valve stem pushes the second valve core to compress the second spring and move it away from the second mounting hole A end, so that the outlet of the first oil passage is connected to the inside of the second valve seat through the oil inlet hole, and the inside of the second mounting hole A end is connected to the inlet of the second air passage.

[0018] The second valve seat includes a second valve sleeve and a second spring seat. The second valve sleeve is a hollow structure with openings at both ends. Its outer wall is threaded to the inner wall of the second mounting hole B. The inner wall of one opening is threaded to the second spring seat. One end of the second spring is located inside the opening of the second valve core, and the other end is sleeved on the outside of the second fixing post set on the second spring seat. A third inclined surface is provided on the other end of the second valve core. When the second valve core structure is in the first state, the third inclined surface is sealed and engaged with a fourth inclined surface provided on the inner wall of the second valve sleeve. The oil inlet is opened on the second valve sleeve, and the fourth inclined surface is located on the side of the oil inlet near the second valve stem.

[0019] The second valve stem includes a third end rod, a second intermediate rod, and a fourth end rod. One end of the third end rod abuts against the other end of the second valve core, and the other end of the third end rod passes through the opening end of the second valve sleeve away from the second spring seat and is fixedly connected to one end of the second intermediate rod. The side wall of the second intermediate rod slides into the inner wall of the middle part of the second mounting hole. When the second valve core structure is in the first state, the side wall of the second intermediate rod blocks the inlet of the second air passage. The other end of the second intermediate rod is fixedly connected to one end of the fourth end rod. The other end of the fourth end rod abuts against the second screw plug located inside the second mounting hole A end. The outer diameters of the third end rod and the fourth end rod are equal, and the outer diameters of the third end rod and the fourth end rod are both smaller than the outer diameter of the second intermediate rod.

[0020] The injection structure includes an injection seat mounted on a valve body and a nozzle mounted on the injection seat. The injection seat has a first injection passage and multiple second injection passages inside. The inlet and outlet of the first injection passage are respectively connected to the outlet of the second oil passage and the inside of the nozzle. The multiple second injection passages are arranged around the first injection passage, and the inlet and outlet of the second injection passage are respectively connected to the outlet of the second air passage and the inside of the nozzle.

[0021] The valve body is also provided with a third air passage, and the outlet of the second air passage is connected to the inlet of multiple second injection passages through the third air passage.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] This invention discloses a grease injection valve comprising a valve body, a first valve core structure, a second valve core structure, and an injection structure. The valve body internally includes an air inlet channel, an oil inlet channel, a first mounting hole, a second mounting hole, a first air passage, a first oil passage, a second air passage, and a second oil passage. The inlet of the air inlet channel is connected to the outside of the valve body. The connection between the outlet of the air inlet channel and the interior of the first mounting hole (end A) is controlled by the first valve core structure located inside the first mounting hole. The inlet and outlet of the oil inlet channel are respectively connected to the outside of the valve body and the interior of the first mounting hole (end B). The inlet and outlet of the first air passage are respectively connected to the interior of the first mounting hole (end A) and the interior of the second mounting hole (end A). The inlet of the first oil passage is connected to the interior of the first mounting hole (end B). The connection between the inlet of the second air passage and the interior of the second mounting hole (end A), and the connection between the outlet of the first oil passage and the interior of the second mounting hole (end B) are both controlled by the second valve core structure located inside the second mounting hole. The outlet of the second air passage is connected to the interior of the injection structure. The outlet and outlet of the second oil passage are respectively connected to the interior of the second mounting hole (end B) and the interior of the injection structure. The injection structure is mounted on the valve body and is used to simultaneously inject compressed air and grease. The design operates as follows: the air passage consists of an intake channel, a first air passage, and a second air passage; the oil passage consists of an oil inlet channel, a first oil passage, and a second oil passage. When neither compressed air nor grease is connected, both the first and second valve core structures are in their first state, where both the air and oil passages are closed. After compressed air and grease are connected, when the grease pressure inside the first mounting hole B reaches a first preset pressure, the first valve core structure enters its second state. At this point, the air passage is open, and compressed air enters the second mounting hole A. When the compressed air pressure inside the second mounting hole A reaches a second preset pressure, the second valve core structure enters its second state, where the oil passage is open. Compressed air and grease simultaneously enter the injection structure, which then sprays out grease to lubricate the gear surface. This design, by allowing compressed air and grease to enter the injection structure simultaneously, effectively prevents grease from dripping from the nozzle before the air passage opens, thus avoiding grease waste. Therefore, this invention not only avoids compressed air waste but also grease waste. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention.

[0025] Figure 2 This is a side view of the present invention.

[0026] Figure 3 for Figure 2 Sectional view along the AA direction.

[0027] Figure 4 for Figure 2 Sectional view along the BB direction.

[0028] Figure 5This is a diagram of the internal structure of the present invention.

[0029] Figure 6 for Figure 5 A schematic diagram of the structure of the first valve core.

[0030] Figure 7 for Figure 5 A schematic diagram of the second valve core structure.

[0031] Figure 8 for Figure 5 A schematic diagram of the injection structure.

[0032] Figure 9 This is a schematic diagram of the first valve core structure in the second state in this invention.

[0033] Figure 10 This is a schematic diagram of the second valve core structure in the second state in this invention.

[0034] In the diagram, the components are: valve body 1, air inlet channel 11, oil inlet channel 12, first mounting hole 13, second mounting hole 14, first air passage 15, first oil passage 16, second air passage 17, second oil passage 18, third air passage 19, injection structure 2, injection seat 21, first injection passage 211, second injection passage 212, nozzle 22, first valve core structure 3, first valve seat 31, air inlet 311, first valve sleeve 312, first spring seat 313, first fixing post 314, second inclined surface 315, first valve core 32, and first inclined surface 321. First valve stem 33, first end rod 331, first intermediate rod 332, second end rod 333, second sealing ring 334, first spring 34, first screw plug 35, second valve core structure 4, second valve seat 41, oil inlet 411, second valve sleeve 412, second spring seat 413, second fixed post 414, fourth inclined surface 415, second valve core 42, first sealing ring 421, third inclined surface 422, second valve stem 43, third end rod 431, second intermediate rod 432, fourth end rod 433, second spring 44, second screw plug 45. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0036] See Figures 1 to 10A grease injection valve includes a valve body 1 and an injection structure 2. The valve body 1 is internally provided with an air inlet channel 11, an oil inlet channel 12, a first mounting hole 13, a second mounting hole 14, a first air passage 15, a first oil passage 16, a second air passage 17, and a second oil passage 18. The inlet of the air inlet channel 11 is connected to the outside of the valve body 1. The inlet and outlet of the oil inlet channel 12 are respectively connected to the outside of the valve body 1 and the inside of the first mounting hole 13B. The inlet and outlet of the first air passage 15 are respectively connected to the inside of the first mounting hole 13A and the inside of the second mounting hole 14A. The inlet of the first oil passage 16 is connected to the inside of the first mounting hole 13B. The outlet of the second air passage 17 is connected to the inside of the injection structure 2. The outlet and outlet of the second oil passage 18 are respectively connected to the inside of the second mounting hole 14B and the inside of the injection structure 2. The injection structure 2 is disposed on the valve body 1 and is used to simultaneously inject compressed air and grease.

[0037] The grease injection valve further includes a first valve core structure 3 disposed inside the first mounting hole 13 and a second valve core structure 4 disposed inside the second mounting hole 14. The first valve core structure 3 and the second valve core structure 4 each have a first state and a second state. When the first valve core structure 3 is in the first state, it is used to disconnect the outlet of the air intake channel 11 from the inside of the first mounting hole 13A end. When the first valve core structure 3 is in the second state, it is used to connect the outlet of the air intake channel 11 with the inside of the first mounting hole 13A end. When the second valve core structure 4 is in the first state, it is used to disconnect the inlet of the second air passage 17 from the inside of the second mounting hole 14A end and the outlet of the first oil passage 16 from the inside of the second mounting hole 14B end. When the second valve core structure 4 is in the second state, it is used to connect the inlet of the second air passage 17 to the inside of the second mounting hole 14A end and the outlet of the first oil passage 16 to the inside of the second mounting hole 14B end.

[0038] The first valve core structure 3 is in a first state when the pressure inside the air intake channel 11 is less than a first preset value, and in a second state when the pressure inside the oil intake channel 12 reaches the first preset value;

[0039] The second valve core structure 4 is in a first state when the pressure inside the oil inlet channel 12 is less than a second preset value, and in a second state when the pressure inside the oil inlet channel 12 reaches the second preset value.

[0040] The first valve core structure 3 includes a first valve seat 31, a first valve core 32, and a first valve stem 33. The first valve seat 31 and the first valve core 32 are both hollow structures with one open end. The first valve seat 31 is located inside the first mounting hole 13A end, and an air inlet 311 is opened on it at the position corresponding to the outlet of the air inlet channel 11. The first valve core 32 is located inside the open end of the first valve seat 31, and its inner wall slides with the outer wall of the first valve core 32. A first spring 34 is provided inside the open end of the first valve seat 31, which abuts against the first valve seat 31. One end of the first valve stem 33 is inserted into the first valve seat 31 from the open end of the first valve seat 31 and abuts against the other end of the first valve core 32. Its middle outer wall slides with the middle outer wall of the first mounting hole 13, and its other end is inserted into the B end of the first mounting hole 13.

[0041] When the first valve core structure 3 is in the first state, the air inlet 311 is blocked by the outer wall of the first valve core 32;

[0042] When the first valve core structure 3 is in the second state, the first valve stem 33 pushes the first valve core 32 to compress the first spring 34 and move it away from the end of the first mounting hole 13B, so that the outlet of the air intake channel 11 is connected to the inside of the first valve seat 31 through the air intake hole 311.

[0043] The first valve seat 31 includes a first valve sleeve 312 and a first spring seat 313. The first valve sleeve 312 is a hollow structure with openings at both ends. Its outer wall is threaded to the inner wall of the first mounting hole 13A. The inner wall of one end of its opening is threaded to the first spring seat 313. One end of the first spring 34 is located inside the opening end of the first valve core 32, and the other end is sleeved on the outside of the first fixing post 314 provided on the first spring seat 313. A first inclined surface 321 is provided on the other end of the first valve core 32. When the first valve core structure 3 is in the first state, the first inclined surface 321 is sealed and engaged with a second inclined surface 315 provided on the inner wall of the first valve sleeve 312. The air inlet 311 is opened on the first valve sleeve 312, and the second inclined surface 315 is located on the side of the air inlet 311 near the first valve stem 33.

[0044] The first valve stem 33 includes a first end rod 331, a first intermediate rod 332, and a second end rod 333. One end of the first end rod 331 abuts against the other end of the first valve core 32, and the other end of the first end rod 331 passes through the opening end of the first valve sleeve 312 away from the first spring seat 313 and is fixedly connected to one end of the first intermediate rod 332. The side wall of the first intermediate rod 332 slides against the inner wall of the middle part of the first mounting hole 13. A second sealing ring 334 is provided on the side wall of the first intermediate rod 332. The other end of the first intermediate rod 332 is fixedly connected to one end of the second end rod 333. The other end of the second end rod 333 abuts against the first screw plug 35 provided inside the first mounting hole 13B. The outer diameters of the first end rod 331 and the second end rod 333 are equal, and the outer diameters of the first end rod 331 and the second end rod 333 are both smaller than the outer diameter of the first intermediate rod 332.

[0045] The second valve core structure 4 includes a second valve seat 41, a second valve core 42, and a second valve stem 43. The second valve seat 41 and the second valve core 42 are both hollow structures with one open end. The second valve seat 41 is located inside the second mounting hole 14B end, and an oil inlet hole 411 is opened on it at the position corresponding to the outlet of the first oil passage 16. The second valve core 42 is located inside the open end of the second valve seat 41, and its outer wall is slidably engaged with the inner wall of the second valve seat 41. A first sealing ring 421 is provided on its outer wall, and a second spring 44 is provided inside its open end to abut against the second valve seat 41. One end of the second valve stem 43 is inserted into the second valve seat 41 from the open end of the second valve seat 41 and abuts against the other end of the second valve core 42. Its middle outer wall is slidably engaged with the middle outer wall of the second mounting hole 14, and its other end is inserted into the A end of the second mounting hole 14.

[0046] When the second valve core structure 4 is in the first state, the oil inlet 411 is blocked by the outer wall of the second valve core 42, and the inlet of the second air passage 17 is blocked by the middle outer wall of the second valve stem 43;

[0047] When the second valve core structure 4 is in the second state, the second valve stem 43 pushes the second valve core 42 to compress the second spring 44 and move it away from the A end of the second mounting hole 14, so that the outlet of the first oil passage 16 is connected to the inside of the second valve seat 41 through the oil inlet hole 411, and the inside of the A end of the second mounting hole 14 is connected to the inlet of the second air passage 17.

[0048] The second valve seat 41 includes a second valve sleeve 412 and a second spring seat 413. The second valve sleeve 412 is a hollow structure with openings at both ends. Its outer wall is threaded to the inner wall of the second mounting hole 14B. The inner wall of one end of its opening is threaded to the second spring seat 413. One end of the second spring 44 is located inside the opening end of the second valve core 42, and the other end is sleeved on the outside of the second fixing post 414 provided on the second spring seat 413. A third inclined surface 422 is provided on the other end of the second valve core 42. When the second valve core structure 4 is in the first state, the third inclined surface 422 is sealed and engaged with a fourth inclined surface 415 provided on the inner wall of the second valve sleeve 412. The oil inlet hole 411 is opened on the second valve sleeve 412, and the fourth inclined surface 415 is located on the side of the oil inlet hole 411 near the second valve stem 43.

[0049] The second valve stem 43 includes a third end rod 431, a second intermediate rod 432, and a fourth end rod 433. One end of the third end rod 431 abuts against the other end of the second valve core 42, and the other end of the third end rod 431 passes through the opening end of the second valve sleeve 412 away from the second spring seat 413 and is fixedly connected to one end of the second intermediate rod 432. The side wall of the second intermediate rod 432 slides against the inner wall of the middle part of the second mounting hole 14. When the second valve core structure 4 is in the first state, the side wall of the second intermediate rod 432 blocks the inlet of the second air passage 17. The other end of the second intermediate rod 432 is fixedly connected to one end of the fourth end rod 433. The other end of the fourth end rod 433 abuts against the second screw plug 45 located inside the second mounting hole 14A end. The outer diameters of the third end rod 431 and the fourth end rod 433 are equal, and the outer diameters of the third end rod 431 and the fourth end rod 433 are both smaller than the outer diameter of the second intermediate rod 432.

[0050] The injection structure 2 includes an injection seat 21 mounted on the valve body 1 and a nozzle 22 mounted on the injection seat 21. The injection seat 21 is provided with a first injection passage 211 and a plurality of second injection passages 212. The inlet and outlet of the first injection passage 211 are respectively connected to the outlet of the second oil passage 18 and the interior of the nozzle 22. The plurality of second injection passages 212 are arranged around the first injection passage 211. The inlet and outlet of the second injection passage 212 are respectively connected to the outlet of the second air passage 17 and the interior of the nozzle 22.

[0051] The valve body 1 is also provided with a third air passage 19, and the outlet of the second air passage 17 is connected to the inlet of a plurality of second injection passages 212 through the third air passage 19.

[0052] Example 1:

[0053] See Figures 1 to 8A grease injection valve includes a valve body 1, an injection structure 2, a first valve core structure 3, and a second valve core structure 4. The injection structure 2 is disposed on the valve body 1 and is used to simultaneously inject compressed air and grease. The valve body 1 is internally provided with an air inlet channel 11, an oil inlet channel 12, a first mounting hole 13, a second mounting hole 14, a first air passage 15, a first oil passage 16, a second air passage 17, and a second oil passage 18. The first valve core structure 3 and the second valve core structure 4 are respectively disposed inside the first mounting hole 13 and the second mounting hole 14. The first valve core structure 3 includes a first valve seat 31, a first valve core 32, a first valve stem 33, and a first spring 34. The first valve seat 31 includes a first valve sleeve 312 and a first spring seat 313. The first valve sleeve 312 is a hollow structure with openings at both ends. Its outer wall is threaded to the inner wall of the first mounting hole 13 at end A, and its inner wall at one open end is threaded to the first spring seat 313. An air inlet hole 311 is provided in the middle part corresponding to the outlet of the air inlet channel 11. The first valve core 32 is disposed inside the other open end of the first valve sleeve 312, and its inner wall slides with the outer wall of the first valve core 32. The first valve core 32 is a hollow structure with one open end. One end of the first spring 34 is located inside the open end of the first valve core 32, and its other end is sleeved on the outside of the first fixing post 314 provided on the first spring seat 313. One end of the first valve stem 33 is inserted into the first valve seat 31 from the other open end of the first valve seat 31 and then... The first valve core 32 abuts against the first valve stem 33, and the middle outer wall of the first valve stem 33 slides against the middle outer wall of the first mounting hole 13. The other end of the first valve stem 33 is inserted into the B end of the first mounting hole 13 and abuts against the first screw plug 35 fixed inside the B end of the first mounting hole 13. The second valve core structure 4 includes a second valve seat 41, a second valve core 42, a second valve stem 43, and a second spring 44. The second valve seat 41 includes a second valve sleeve 412 and a second spring seat 413. The second valve sleeve 412 is a hollow structure with openings at both ends. Its outer wall is threaded to the inner wall of the B end of the second mounting hole 14, and its inner wall at one open end is threaded to the second spring seat 413. An oil inlet hole 4 is provided in the middle part corresponding to the outlet of the first oil passage 16. 11. The second valve core 42 is disposed inside the other open end of the second valve seat 41 and its outer wall is slidably fitted with the inner wall of the second valve seat 41. The second valve core 42 is a hollow structure with one open end. One end of the second spring 44 is located inside the open end of the second valve core 42, and its other end is sleeved on the outside of the second fixing post 414 disposed on the second spring seat 413. One end of the second valve stem 43 is inserted into the second valve seat 41 from the other open end of the second valve seat 41 and abuts against the second valve core 42. The middle outer wall of the second valve stem 43 is slidably fitted with the middle outer wall of the second mounting hole 14. The other end of the second valve stem 43 is inserted into the A end of the second mounting hole 14 and abuts against the second screw plug 45 fixed inside the A end of the second mounting hole 14.

[0054] The inlet of the air intake channel 11 is connected to the compressed air structure. The inlet and outlet of the oil intake channel 12 are connected to the grease connector and communicate with the inside of the first mounting hole 13B. The inlet and outlet of the first air passage 15 are connected to the inside of the first mounting hole 13A and the inside of the second mounting hole 14A. The inlet of the first oil passage 16 is connected to the inside of the first mounting hole 13B. The outlet of the second air passage 17 is connected to the inside of the injection structure 2. The outlet and outlet of the second oil passage 18 are connected to the inside of the second mounting hole 14B and the inside of the injection structure 2.

[0055] See Figure 9 The connection between the outlet of the air intake channel 11 and the interior of the first mounting hole 13A is determined by the working state of the first valve core structure 3: the initial state of the first valve core structure 3 is the first state, at which time the air intake hole 311 is blocked by the outer wall of the first valve core 32, so that the outlet of the air intake channel 11 is isolated from the interior of the first valve seat 31. After the grease is connected through the grease connector on the oil intake channel 12, the grease pressure inside the first mounting hole 13B increases. When the pressure increases to the first preset value, the first valve stem 33 pushes the first valve core 32 to move away from the first mounting hole 13B against the spring force of the first spring 34, so that the first valve core structure 3 enters the second state. The outlet of the air intake channel 11 is connected to the interior of the first valve seat 31 through the air intake hole 311, the air passage is opened, and after the grease connector is no longer connected to the grease, the first valve core structure 3 returns to the first state under the action of the first spring 34, and the air passage is closed.

[0056] See Figure 10The connection between the inlet of the second air passage 17 and the interior of the second mounting hole 14A, and the connection between the outlet of the first oil passage 16 and the interior of the second mounting hole 14B, are determined by the working state of the second valve core structure 4. The initial state of the second valve core structure 4 is the first state, at which time the oil inlet 411 is blocked by the outer wall of the second valve core 42, and the inlet of the second air passage 17 is blocked by the outer wall of the middle part of the second valve stem 43, thus isolating the outlet of the first oil passage 16 from the interior of the second valve seat 41, and isolating the interior of the second mounting hole 14A from the inlet of the second air passage 17. After the first valve core structure 3 enters the second state from the first state and opens the air passage, compressed air enters through the compressed air connector. Inside the A end of the second mounting hole 14, the compressed air pressure inside the A end of the second mounting hole 14 increases. When the pressure increases to the second preset value, the second valve stem 43 pushes the second valve core 42 to overcome the spring force of the second spring 44 and move away from the A end of the second mounting hole 14. This causes the outlet of the first oil passage 16 to connect with the inside of the second valve seat 41 through the oil inlet 411, and the inside of the A end of the second mounting hole 14 to connect with the inlet of the second air passage 17. The second valve core structure 4 enters the second state, the oil passage is opened, and after the compressed air connector is no longer connected to compressed air, the second valve core structure 4 returns to the first state under the action of the second spring 44, and the oil passage is closed.

[0057] When compressed air and grease are not connected, both the first valve core structure 3 and the second valve core structure 4 are in the first state, and the air passage and oil passage are closed. After compressed air and grease are connected, when the grease pressure reaches the first preset value, the first valve core structure 3 enters the second state and the air passage opens. When the compressed air pressure reaches the second preset value, the second valve core structure 4 enters the second state and the oil passage opens. At this time, the compressed air and grease enter the injection structure 2 at the same time, and the grease is sprayed out under the action of the compressed air pressure.

[0058] Example 2:

[0059] The difference from Example 1 is as follows:

[0060] The first valve core 32 has a first inclined surface 321 on one end away from its opening end. When the first valve core structure 3 is in the first state, the first inclined surface 321 is sealed and engaged with the second inclined surface 315 on the inner wall of the first valve sleeve 312. The second inclined surface 315 is located on the side of the air inlet 311 close to the first valve stem 33.

[0061] A first sealing ring 421 is provided on the outer wall of the second valve core 42, and a third inclined surface 422 is provided on the end of the second valve core 42 away from its opening end. When the second valve core structure 4 is in the first state, the third inclined surface 422 is sealed and engaged with a fourth inclined surface 415 provided on the inner wall of the second valve sleeve 412. The fourth inclined surface 415 is located on the side of the oil inlet hole 411 near the second valve stem 43.

[0062] Example 3:

[0063] The difference from Example 1 is as follows:

[0064] The first valve stem 33 includes a first end rod 331, a first intermediate rod 332, and a second end rod 333. One end of the first end rod 331 abuts against the other end of the first valve core 32, and the other end of the first end rod 331 passes through the opening end of the first valve sleeve 312 away from the first spring seat 313 and is fixedly connected to one end of the first intermediate rod 332. The side wall of the first intermediate rod 332 slides against the inner wall of the middle part of the first mounting hole 13. A second sealing ring 334 is provided on the side wall of the first intermediate rod 332. The other end of the first intermediate rod 332 is fixedly connected to one end of the second end rod 333. The other end of the second end rod 333 abuts against the first screw plug 35 provided inside the first mounting hole 13B. The outer diameters of the first end rod 331 and the second end rod 333 are equal, and the outer diameters of the first end rod 331 and the second end rod 333 are both smaller than the outer diameter of the first intermediate rod 332.

[0065] The second valve stem 43 includes a third end rod 431, a second intermediate rod 432, and a fourth end rod 433. One end of the third end rod 431 abuts against the other end of the second valve core 42, and the other end of the third end rod 431 passes through the opening end of the second valve sleeve 412 away from the second spring seat 413 and is fixedly connected to one end of the second intermediate rod 432. The side wall of the second intermediate rod 432 slides against the inner wall of the middle part of the second mounting hole 14. When the second valve core structure 4 is in the first state, the side wall of the second intermediate rod 432 blocks the inlet of the second air passage 17. The other end of the second intermediate rod 432 is fixedly connected to one end of the fourth end rod 433. The other end of the fourth end rod 433 abuts against the second screw plug 45 located inside the second mounting hole 14A end. The outer diameters of the third end rod 431 and the fourth end rod 433 are equal, and the outer diameters of the third end rod 431 and the fourth end rod 433 are both smaller than the outer diameter of the second intermediate rod 432.

[0066] Example 4:

[0067] The difference from Example 1 is as follows:

[0068] The injection structure 2 includes an injection seat 21 mounted on the valve body 1 and a nozzle 22 mounted on the injection seat 21. The injection seat 21 is provided with a first injection passage 211 and a plurality of second injection passages 212. The inlet and outlet of the first injection passage 211 are respectively connected to the outlet of the second oil passage 18 and the interior of the nozzle 22. The plurality of second injection passages 212 are arranged around the first injection passage 211. The inlet and outlet of the second injection passage 212 are respectively connected to the outlet of the second air passage 17 and the interior of the nozzle 22.

[0069] Example 5:

[0070] The difference from Example 4 is that:

[0071] The valve body 1 is also provided with a third air passage 19, and the outlet of the second air passage 17 is connected to the inlet of a plurality of second injection passages 212 through the third air passage 19.

Claims

1. A grease injection valve, comprising a valve body (1) and an injection structure (2), characterized in that: The valve body (1) is internally provided with an air inlet channel (11), an oil inlet channel (12), a first mounting hole (13), a second mounting hole (14), a first air passage (15), a first oil passage (16), a second air passage (17), and a second oil passage (18). The inlet of the air inlet channel (11) is connected to the outside of the valve body (1). The inlet and outlet of the oil inlet channel (12) are connected to the outside of the valve body (1) and the inside of the B end of the first mounting hole (13), respectively. The inlet and outlet of the first air passage (15) are connected to the outside of the valve body (1). The first oil passage (16) is connected to the inside of the first mounting hole (13) A end and the second mounting hole (14) A end respectively. The inlet of the first oil passage (16) is connected to the inside of the first mounting hole (13) B end. The outlet of the second air passage (17) is connected to the inside of the injection structure (2). The inlet and outlet of the second oil passage (18) are connected to the inside of the second mounting hole (14) B end and the inside of the injection structure (2) respectively. The injection structure (2) is set on the valve body (1) and is used to simultaneously inject compressed air and lubricating grease. The grease injection valve further includes a first valve core structure (3) disposed inside the first mounting hole (13) and a second valve core structure (4) disposed inside the second mounting hole (14). The first valve core structure (3) and the second valve core structure (4) each have a first state and a second state. When the first valve core structure (3) is in the first state, it is used to disconnect the outlet of the intake channel (11) from the inside of the A end of the first mounting hole (13). When the first valve core structure (3) is in the second state, it is used to connect the outlet of the intake channel (11) with the inside of the A end of the first mounting hole (13). When the second valve core structure (4) is in the first state, it is used to disconnect the inlet of the second air passage (17) from the inside of the A end of the second mounting hole (14) and the outlet of the first oil passage (16) from the inside of the B end of the second mounting hole (14). When the second valve core structure (4) is in the second state, it is used to connect the inlet of the second air passage (17) from the inside of the A end of the second mounting hole (14) and the outlet of the first oil passage (16) from the inside of the B end of the second mounting hole (14).

2. The grease injection valve according to claim 1, characterized in that: The first valve core structure (3) is in a first state when the pressure inside the oil inlet channel (12) is less than a first preset value, and in a second state when the pressure reaches the first preset value; The second valve core structure (4) is in the first state when the pressure inside the air intake channel (11) is less than the second preset value, and in the second state when the pressure reaches the second preset value.

3. A grease injection valve according to claim 1 or 2, characterized in that: The first valve core structure (3) includes a first valve seat (31), a first valve core (32), and a first valve stem (33). The first valve seat (31) and the first valve core (32) are both hollow structures with one open end. The first valve seat (31) is located inside the A end of the first mounting hole (13). An air inlet hole (311) is provided on the first valve seat (31) at a position corresponding to the outlet of the air inlet channel (11). The first valve core (32) is located inside the open end of the first valve seat (31) and inside the first valve seat (31). The wall slides in cooperation with the outer wall of the first valve core (32). The first valve core (32) is provided with a first spring (34) that abuts against the first valve seat (31) inside the open end. One end of the first valve stem (33) is inserted into the first valve seat (31) from the open end and abuts against the other end of the first valve core (32). The middle outer wall of the first valve stem (33) slides in cooperation with the middle outer wall of the first mounting hole (13). The other end of the first valve stem (33) is inserted into the B end of the first mounting hole (13). When the first valve core structure (3) is in the first state, the air inlet (311) is blocked by the outer wall of the first valve core (32); When the first valve core structure (3) is in the second state, the first valve stem (33) pushes the first valve core (32) to compress the first spring (34) and move it away from the B end of the first mounting hole (13), so that the outlet of the air intake channel (11) is connected to the inside of the first valve seat (31) through the air intake hole (311).

4. A grease injection valve according to claim 3, characterized in that: The first valve seat (31) includes a first valve sleeve (312) and a first spring seat (313). The first valve sleeve (312) is a hollow structure with openings at both ends. The outer wall of the first valve sleeve (312) is threaded to the inner wall of the first mounting hole (13) at end A. The inner wall of the opening at one end of the first valve sleeve (312) is threaded to the first spring seat (313). One end of the first spring (34) is located inside the opening end of the first valve core (32), and the other end is sleeved on the first spring seat (313). Outside the first fixed post (314) set on the top, the other end of the first valve core (32) is provided with a first inclined surface (321). When the first valve core structure (3) is in the first state, the first inclined surface (321) is sealed and cooperates with the second inclined surface (315) provided on the inner wall of the first valve sleeve (312). The air inlet (311) is opened on the first valve sleeve (312), and the second inclined surface (315) is located on the side of the air inlet (311) close to the first valve stem (33).

5. A grease injection valve according to claim 4, characterized in that: The first valve stem (33) includes a first end rod (331), a first intermediate rod (332), and a second end rod (333). One end of the first end rod (331) abuts against the other end of the first valve core (32). The other end of the first end rod (331) passes through the opening end of the first valve sleeve (312) away from the first spring seat (313) and is fixedly connected to one end of the first intermediate rod (332). The side wall of the first intermediate rod (332) slides in fit with the inner wall of the middle part of the first mounting hole (13). A second sealing ring (334) is provided on the side wall of the first intermediate rod (332). The other end of the first intermediate rod (332) is fixedly connected to one end of the second end rod (333). The other end of the second end rod (333) abuts against the first screw plug (35) provided inside the B end of the first mounting hole (13). The outer diameters of the first end rod (331) and the second end rod (333) are equal, and the outer diameters of the first end rod (331) and the second end rod (333) are both smaller than the outer diameter of the first intermediate rod (332).

6. A grease injection valve according to claim 1 or 2, characterized in that: The second valve core structure (4) includes a second valve seat (41), a second valve core (42), and a second valve stem (43). Both the second valve seat (41) and the second valve core (42) are hollow structures with one open end. The second valve seat (41) is located inside the B end of the second mounting hole (14). An oil inlet hole (411) is provided on the second valve seat (41) at a position corresponding to the outlet of the first oil passage (16). The second valve core (42) is located inside the open end of the second valve seat (41). The outer wall of the second valve core (42) slides against the inner wall of the second valve seat (41). The second valve core (42) is provided with a first sealing ring (421) on its outer wall. The second valve core (42) is provided with a second spring (44) that abuts against the second valve seat (41) inside its open end. One end of the second valve stem (43) is inserted into the second valve seat (41) from its open end and abuts against the other end of the second valve core (42). The middle outer wall of the second valve stem (43) slides in fit with the middle outer wall of the second mounting hole (14). The other end of the second valve stem (43) is inserted into the A end of the second mounting hole (14). When the second valve core structure (4) is in the first state, the oil inlet (411) is blocked by the outer wall of the second valve core (42), and the inlet of the second air passage (17) is blocked by the middle outer wall of the second valve stem (43); When the second valve core structure (4) is in the second state, the second valve stem (43) pushes the second valve core (42) to compress the second spring (44) and move it away from the A end of the second mounting hole (14), so that the outlet of the first oil passage (16) is connected to the inside of the second valve seat (41) through the oil inlet hole (411), and the inside of the A end of the second mounting hole (14) is connected to the inlet of the second air passage (17).

7. A grease injection valve according to claim 6, characterized in that: The second valve seat (41) includes a second valve sleeve (412) and a second spring seat (413). The second valve sleeve (412) is a hollow structure with openings at both ends. The outer wall of the second valve sleeve (412) is threaded to the inner wall of the second mounting hole (14) at end B. The inner wall of the opening at one end of the second valve sleeve (412) is threaded to the second spring seat (413). One end of the second spring (44) is located inside the opening end of the second valve core (42), and the other end is sleeved on the second spring seat (413). Outside the second fixed column (414) set on the upper part, a third inclined surface (422) is provided on the other end of the second valve core (42). When the second valve core structure (4) is in the first state, the third inclined surface (422) is sealed and cooperates with the fourth inclined surface (415) provided on the inner wall of the second valve sleeve (412). The oil inlet (411) is opened on the second valve sleeve (412), and the fourth inclined surface (415) is located on the side of the oil inlet (411) close to the second valve stem (43).

8. A grease injection valve according to claim 7, characterized in that: The second valve stem (43) includes a third end rod (431), a second intermediate rod (432), and a fourth end rod (433). One end of the third end rod (431) abuts against the other end of the second valve core (42). The other end of the third end rod (431) passes through the opening of the second valve sleeve (412) away from the second spring seat (413) and is fixedly connected to one end of the second intermediate rod (432). The side wall of the second intermediate rod (432) slides against the inner wall of the middle part of the second mounting hole (14). 2) The sidewall of the second valve core structure (4) blocks the inlet of the second air passage (17) when the second valve core structure (4) is in the first state. The other end of the second intermediate rod (432) is fixedly connected to one end of the fourth end rod (433). The other end of the fourth end rod (433) abuts against the second screw plug (45) set inside the A end of the second mounting hole (14). The outer diameters of the third end rod (431) and the fourth end rod (433) are equal, and the outer diameters of the third end rod (431) and the fourth end rod (433) are both smaller than the outer diameter of the second intermediate rod (432).

9. A grease injection valve according to claim 1 or 2, characterized in that: The injection structure (2) includes an injection seat (21) mounted on a valve body (1) and a nozzle (22) mounted on the injection seat (21). The injection seat (21) is provided with a first injection passage (211) and a plurality of second injection passages (212). The inlet and outlet of the first injection passage (211) are respectively connected to the outlet of the second oil passage (18) and the inside of the nozzle (22). The plurality of second injection passages (212) are arranged around the first injection passage (211). The inlet and outlet of the second injection passage (212) are respectively connected to the outlet of the second air passage (17) and the inside of the nozzle (22).

10. A grease injection valve according to claim 9, characterized in that: The valve body (1) is also provided with a third air passage (19), and the outlet of the second air passage (17) is connected to the inlet of multiple second injection passages (212) through the third air passage (19).

Images