Double-seal high-pressure grease injection valve

Abstract

The invention relates to the technical field of petroleum equipment, and discloses a double-seal high-pressure grease injection valve which comprises a valve body, a valve cover covers the top end of the valve body, a valve element is movably arranged in the valve body, a valve ball is connected to the top end of the valve element, a grease injection opening is formed in the top end of the valve body, and a first inclined face matched with the valve ball is arranged at the bottom end of the grease injection opening; a sealing plate is connected to the valve element, an inclined face is arranged on the edge of the sealing plate, a first sealing ring is connected to the inclined face, a second inclined face corresponding to the first sealing ring is arranged in the middle of the valve body, and pressure balance cavities are formed in the two sides of the valve body in a communicating mode. A double-sealing structure of the high-pressure grease injection valve is formed, when the high-pressure grease injection valve is used in high-pressure equipment such as petroleum equipment, the pressure in the equipment can be utilized, tight attachment of two-stage sealing positions can be kept, the sealing performance of the high-pressure grease injection valve is improved, and the leakage risk of the grease injection valve is reduced; the pressure balance cavity is adopted to regulate and control the pressure in the valve body during grease injection, it is guaranteed that sealing grease enters smoothly, pressure balance is achieved in the valve body, and the safety performance of the grease injection valve in the high-pressure environment is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of petroleum equipment, and more specifically to a double-sealed high-pressure grease injection valve. Background Art

[0002] Grease injection valves are an important component of petrochemical equipment. For example, the flat gate valves and ball valves used in the oil and gas field production and transportation process are equipped with grease injection valves. In order to keep the equipment in good operating condition, it is necessary to add sealing grease to the valve through the grease injection valve during the daily maintenance of the valve to protect the internal structure of the valve, prevent valve leakage, and extend the service life of the equipment.

[0003] The existing grease injection valve structure includes a valve body, a valve cover, a grease injection channel and a sealing body. A valve cover is provided at one end of the valve body, a grease injection channel is provided in the valve body, a sealing surface is provided in the grease injection channel, and a sealing body for sealing is provided on the sealing surface. The sealing body is connected to the valve body through a spring. When external sealing grease is injected, the pressure of the sealing grease acts on the sealing body, causing the sealing body to separate from the sealing surface, thereby realizing the injection of the sealing grease.

[0004] In the prior art, for example, the utility model patent with application number CN202222965292.5 discloses a new type of high-pressure grease injection valve, including a body, a limiting mechanism is arranged inside the body, the limiting mechanism includes a spring, a spring is arranged inside the body, the lower end of the spring is connected to the inner wall of the body, and the upper end of the spring is connected to a fixed plate; through the structural design of the limiting mechanism, since the position of the limiting frame is fixed, the limiting frame has a guiding and limiting function on the limiting rod, so that the movement of the fixed plate is constrained by the limiting rod, so that the two ends of the spring will not be offset during the compression and rebound process. This grease injection valve adopts a single-stage sealing structure. Even if the offset is reduced by the limiting structure, in actual use, under the condition of vibration and frequent opening and closing, the sealing performance will still decrease, resulting in leakage and failure of the grease injection valve.

[0005] Therefore, it is necessary to propose a double-sealed high-pressure grease injection valve to at least partially solve the problems existing in the prior art. Summary of the invention

[0006] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0007] In order to at least partially solve the above problems, the present invention provides a double-sealed high-pressure grease injection valve, comprising:

[0008] The valve body has a valve cover on the top end of the valve body, a valve core is movably arranged in the valve body, a valve ball is connected to the top end of the valve core, a grease injection port is arranged on the top end of the valve body, and a first inclined surface adapted to the valve ball is arranged at the bottom end of the grease injection port; a sealing plate is connected to the valve core, an inclined surface is arranged on the edge of the sealing plate, and a first sealing ring is connected to the inclined surface, a second inclined surface corresponding to the first sealing ring is arranged in the middle of the valve body, and a pressure balancing chamber is arranged in communication on both sides of the valve body.

[0009] Preferably, the valve core includes an upper valve core section and a lower valve core section, a step surface is formed at the connection between the upper valve core section and the lower valve core section, the upper valve core section is connected to the valve ball, the sealing plate is connected to the lower valve core section, and a first spring groove is provided at the bottom end of the lower valve core section; a pin is inserted into the lower part of the valve body, and a first spring is connected between the pin and the first spring groove.

[0010] Preferably, the bottom end of the valve ball is connected to a valve ball seat, the bottom end of the valve ball seat is provided with a second spring groove, the upper valve core section is sleeved with a second spring, and the second spring is connected between the valve core stepped surface and the second spring groove.

[0011] Preferably, a pressure balancing block is slidably connected in the pressure balancing chamber, a second sealing ring is connected to the surface of the pressure balancing block, one end of the pressure balancing block is hinged to the valve ball seat through a connecting rod, and a pressure balancing hole connected to the external environment is provided on the outside of the pressure balancing chamber.

[0012] Preferably, the pressure balance block comprises:

[0013] A limiting slide groove is arranged in the middle of the outer wall of the pressure balance block, and a plurality of limiting slide grooves are evenly arranged along the circumference of the pressure balance block;

[0014] A guide slide bar, one end of which is slidably connected to the limiting slide slot, and the other end of which extends to the notch of the limiting slide slot, and the length of the guide slide bar is less than the length of the limiting slide slot;

[0015] The slider is connected to the guide slide bar and is slidably connected to the inner wall of the limiting slide groove. The guide slide bar is sleeved with a third spring, and the third spring is connected between the slider and the limiting slide groove.

[0016] Preferably, a spiral groove is provided on the inner wall of the pressure balance chamber, and the multiple spiral grooves are evenly arranged along the circumferential direction of the pressure balance chamber, and the width of the spiral groove is adapted to the diameter of the guide slide rod; the second sealing ring is arranged on both sides of the limiting slide groove, and the width of the spiral groove is smaller than the width of the second sealing rings on both sides; a slope is provided on one end of the spiral groove close to the pressure balance block.

[0017] Preferably, the valve body further includes:

[0018] A friction block, which is arranged in an arc shape and is slidably connected to the lower part of the valve core. A plurality of friction blocks are arranged evenly along the circumference of the valve core;

[0019] An elastic pressure plate, one end of which is connected to the inner wall of the valve body, and the other end of which is connected to the friction block. The elastic pressure plate is arranged obliquely and applies oblique upward pressure to the friction block.

[0020] Preferably, the movable bracket is connected between the outer side of the elastic pressure plate and the inner wall of the valve body, the movable bracket is elastic and its length can vary within a preset range, and a magnetic plate is provided on one side where the elastic pressure plate is connected to the movable bracket, and the thickness of the magnetic plate gradually increases from bottom to top.

[0021] Preferably, a threaded area is provided on the outer wall of the valve body, the position of the threaded area corresponds to the position of the movable bracket, an adjusting magnetic ring is screwed on the threaded area, and the adjusting magnetic ring has a repulsive force on the magnetic plate.

[0022] Preferably, the valve cover is threadedly connected to the top of the valve body, a plurality of pressure relief holes are arranged on the valve cover, a pressure relief rod is connected to the center of the valve cover, and the pressure relief rod extends into the grease injection port at the top of the valve body; the gap between the valve cover and the top of the valve body is larger than the gap between the pressure relief rod and the valve ball.

[0023] Compared with the prior art, the present invention has at least the following beneficial effects:

[0024] The double-seal high-pressure grease injection valve provided by the present invention forms a double-seal structure of the high-pressure grease injection valve through the sealing of the valve ball and the first inclined surface, and the sealing of the first sealing ring and the second inclined surface on the sealing plate. When used in high-pressure equipment such as petroleum, the pressure in the equipment can be used to maintain a tight fit between the two-stage seals, thereby improving the sealing performance of the high-pressure grease injection valve and reducing the risk of leakage of the grease injection valve. At the same time, the setting of a pressure balance chamber is adopted to regulate the pressure in the valve body during grease injection, thereby ensuring smooth entry of the sealing grease, achieving pressure balance in the valve body, and improving the safety performance of the grease injection valve in a high-pressure environment.

[0025] The double-seal high-pressure grease injection valve described in the present invention, other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by technicians in this field through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 It is a structural schematic diagram of a cross section of a double-seal high-pressure grease injection valve of the present invention;

[0028] Figure 2 It is a schematic diagram of the cross-sectional structure of the double-sealed high-pressure grease injection valve of the present invention during grease injection;

[0029] Figure 3 For the present invention Figure 1A schematic diagram of the local enlarged structure at point A in the middle;

[0030] Figure 4 For the present invention Figure 1 A schematic diagram of the local enlarged structure at B in the middle;

[0031] Figure 5 It is a schematic diagram of the cross-sectional structure of the pressure balance block at the limiting slide groove in the present invention.

[0032] In the figure: 1. valve body; 2. valve cover; 3. valve core; 4. valve ball; 5. sealing plate; 6. first sealing ring; 7. second inclined surface; 8. pressure balance chamber; 11. pin; 12. first spring groove; 13. first spring; 14. second spring groove; 15. second spring; 16. pressure balance block; 17. second sealing ring; 18. connecting rod; 19. pressure balance hole; 21. limit slide groove; 22. guide slide rod; 23. slider; 24. spiral groove; 31. friction block; 32. elastic pressure plate; 33. movable bracket; 34. magnetic plate; 35. threaded area; 36. adjusting magnetic ring; 41. upper valve core section; 42. lower valve core section; 43. pressure relief hole; 44. pressure relief rod; 45. grease injection port; 46. first inclined surface. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments so that those skilled in the art can implement the invention with reference to the description.

[0034] It should be understood that terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0035] Embodiment 1:

[0036] like Figure 1-5 As shown, the present invention provides a double-sealed high-pressure grease injection valve, comprising:

[0037] A valve body 1 is provided with a valve cover 2 at the top end of the valve body 1, a valve core 3 is movably provided in the valve body 1, a valve ball 4 is connected to the top end of the valve core 3, a grease injection port 45 is provided at the top end of the valve body 1, and a first inclined surface 46 adapted to the valve ball 4 is provided at the bottom end of the grease injection port 45; a sealing plate 5 is connected to the valve core 3, an inclined surface is provided at the edge of the sealing plate 5, and a first sealing ring 6 is connected to the inclined surface, a second inclined surface 7 corresponding to the first sealing ring 6 is provided in the middle of the valve body 1, and a pressure balance chamber 8 is provided on both sides of the valve body 1.

[0038] The working principle and beneficial effects of the above technical solution are:

[0039] The present invention provides a double-sealed high-pressure grease injection valve, wherein a first inclined surface 46 is arranged at the bottom end of a grease injection port 45 of a valve body 1, and a valve ball 4 abuts against the first inclined surface 46 to seal the bottom end of the grease injection port 45, i.e., forming a first-level seal of the high-pressure grease injection valve; a sealing plate 5 is arranged on a valve core 3, and a first sealing ring 6 at the edge of the sealing plate 5 abuts against a second inclined surface 7 in the middle of the valve body 1 to seal the middle of the valve body 1, i.e., forming a second-level seal of the high-pressure grease injection valve. When grease is injected through the grease injection valve, the valve cover 2 is disassembled from the valve body 1, the grease injection port 45 is connected to a grease injection tool, and sealing grease or sealing grease is injected through the grease injection port 45 at a certain pressure. After the sealing grease enters the grease injection port 45, it squeezes the valve ball 4, so that a gap is generated between the valve ball 4 and the first inclined surface 46, and the sealing grease flows into the inner cavity of the valve body 1 through the gap; then the sealing plate 5 is squeezed, so that a gap is generated between the first sealing ring 6 and the second inclined surface 7, and the sealing grease flows into the oil equipment through the gap. A pressure balancing chamber 8 is provided on both sides of the valve body 1. When injecting grease, the valve ball 4 is squeezed to reduce the internal space of the valve body 1, thereby increasing the internal pressure of the valve body 1 and hindering the entry of sealing grease. By providing the pressure balancing chamber 8, the increased pressure is released to ensure the pressure balance in the valve body 1; when subjected to an instantaneous high-pressure impact, the valve ball 4 is squeezed to cause the internal pressure of the valve body 1 to suddenly increase, and the pressure balancing chamber 8 can unload the suddenly increased pressure to prevent the second-level seal of the valve body 1 from being broken.

[0040] Through the above-mentioned structural design, a double-sealed high-pressure grease injection valve is provided, which is sealed by the valve ball 4 and the first inclined surface 46, and the first sealing ring 6 on the sealing plate 5 and the second inclined surface 7, to form a double-sealed structure of the high-pressure grease injection valve. When used in high-pressure equipment such as petroleum, the pressure in the equipment can be used to maintain a tight fit between the two-stage seals, thereby improving the sealing performance of the high-pressure grease injection valve and reducing the risk of leakage of the grease injection valve. At the same time, the pressure balancing chamber 8 is set to regulate the pressure in the valve body 1 during grease injection, thereby ensuring smooth entry of the sealing grease, achieving pressure balance in the valve body 1, and improving the safety performance of the grease injection valve under high-pressure environments.

[0041] Embodiment 2:

[0042] On the basis of the above-mentioned embodiment 1, the valve core 3 includes an upper valve core section 41 and a lower valve core section 42, and a step surface is formed at the connection between the upper valve core section 41 and the lower valve core section 42. The upper valve core section 41 is connected to the valve ball 4, and the sealing plate 5 is connected to the lower valve core section 42. A first spring groove 12 is provided at the bottom end of the lower valve core section 42; a pin 11 is inserted into the lower part of the valve body 1, and a first spring 13 is connected between the pin 11 and the first spring groove 12.

[0043] The working principle and beneficial effects of the above technical solution are:

[0044] A first spring 13 is provided on the lower valve core section 42 of the valve core 3, which is connected to the pin 11 through the first spring 13, and the first spring 13 provides elastic force for the valve core 3 as a whole. When grease injection is not performed, the sealing plate 5 maintains a tendency to move upward under the elastic force of the first spring 13, so that the first sealing ring 6 and the second inclined surface 7 can be in close contact; when the valve ball 4 drives the valve core 4 to move, it is necessary to overcome the elastic force of the first spring 13 so that the valve core 4 can drive the sealing plate 5 to move downward, thereby releasing the second-level seal of the high-pressure grease injection valve; the above structure improves the sealing effect of the grease injection valve and provides power for the valve core 3 to reset.

[0045] Embodiment 3:

[0046] On the basis of the above-mentioned embodiment 2, the bottom end of the valve ball 4 is connected to the valve ball seat 9, the bottom end of the valve ball seat 9 is provided with a second spring groove 14, the upper valve core section 41 is sleeved with a second spring 15, and the second spring 15 is connected between the stepped surface of the valve core 3 and the second spring groove 14.

[0047] The working principle and beneficial effects of the above technical solution are:

[0048] The second spring 15 is arranged on the upper valve core section 41 of the valve core 3, and is connected to the valve ball seat 9 through the second spring 15. The second spring 15 provides elastic force for the valve ball 4 as a whole. When grease injection is not performed, the valve ball 4 maintains an upward movement tendency under the elastic force of the second spring 12, so that the valve ball 4 can be in close contact with the first inclined surface 46; when the valve ball 4 drives the valve core 4 to move, the elastic force of the second spring 15 needs to be overcome to make the valve ball 4 move downward, thereby releasing the first-level seal of the high-pressure grease injection valve.

[0049] By setting up two groups of springs to provide elastic force for the two-stage seal, the grease injection valve can still maintain sealing when any group of spring elastic force is lost; for example, after long-term use, when the valve body 1 is worn, the equipment vibrates, and the second spring 15 does not rebound in time, resulting in a gap between the first inclined surface 46 and the valve ball 4, the first spring 13 can still rebound quickly to maintain the effectiveness of the second-stage seal, thereby extending the service life of the grease injection valve.

[0050] Embodiment 4:

[0051] On the basis of the above-mentioned embodiment 2, a pressure balancing block 16 is slidably connected in the pressure balancing chamber 8, a second sealing ring 17 is connected to the surface of the pressure balancing block 16, one end of the pressure balancing block 16 is hinged to the valve ball seat 9 through a connecting rod 18, and a pressure balancing hole 19 connected to the external environment is provided on the outside of the pressure balancing chamber 8.

[0052] The working principle and beneficial effects of the above technical solution are:

[0053] The pressure balance chamber 8 is arranged between the valve ball 4 and the sealing plate 5 to adjust the pressure of the upper space of the valve body 1. When the valve ball 4 drives the valve ball seat 9 to move downward, the connecting rods 18 on both sides of the valve ball seat 9 rotate, and the other end of the connecting rod 18 squeezes the pressure balance block 16 to move outward along the inner wall of the pressure balance chamber 8, so as to keep the pressure balance of the upper space of the valve body 1 during grease injection; when subjected to high pressure instantaneous impact, the valve ball 4 squeezes the internal pressure of the valve body 1 to suddenly increase, and the pressure balance chamber 8 can unload the suddenly increased pressure to prevent the second-level seal of the valve body 1 from being broken; when the pressure balance block 16 moves to the preset position, the sealing grease is filled in the valve body 1 to increase its internal pressure continuously, thereby squeezing the sealing plate 5 to move; when the pressure balance block 16 moves, the air outside the pressure balance chamber 8 is pressed out from the pressure balance hole 19; the second sealing ring 17 on the surface of the pressure balance block 16 can prevent the sealing grease from flowing out of the pressure balance chamber 8. At the same time, the pressure balance chambers 8 on both sides guide the pressure balance block 16, thereby keeping the valve ball 4 moving in the vertical direction, reducing the left and right shaking amplitude of the valve ball 4, and enabling the valve ball 4 to reset and seal more accurately after the grease injection is completed.

[0054] Embodiment 5:

[0055] On the basis of the above-mentioned embodiment 4, the pressure balance block 16 comprises:

[0056] A limiting slide groove 21, which is arranged in the middle of the outer wall of the pressure balance block 16, and a plurality of limiting slide grooves 21 are evenly arranged along the circumference of the pressure balance block 16;

[0057] A guide slide bar 22, one end of which is slidably connected to the limiting slide slot 21, and the other end of which extends toward the notch of the limiting slide slot 21, and the length of the guide slide bar 22 is less than the length of the limiting slide slot 21;

[0058] The slider 23 is connected to the guide slide bar 22 and is slidably connected to the inner wall of the limiting slide groove 21 . A third spring is sleeved on the guide slide bar 22 and is connected between the slider 23 and the limiting slide groove 21 .

[0059] A spiral groove 24 is provided on the inner wall of the pressure balance chamber 8, and multiple spiral grooves 24 are evenly arranged along the circumferential direction of the pressure balance chamber 8, and the width of the spiral groove 24 is adapted to the diameter of the guide slide rod 22; the second sealing ring 17 is arranged on both sides of the limiting slide groove 21, and the width of the spiral groove 24 is smaller than the width of the second sealing ring 17 on both sides; a slope is provided on one end of the spiral groove 24 close to the pressure balance block 16.

[0060] The working principle and beneficial effects of the above technical solution are:

[0061] When the pressure balance block 16 moves, the guide slide bar 22 is squeezed into the limiting slide groove 21; when the pressure balance block 16 slides to the preset position, the guide slide bar 22 corresponds to one end of the spiral groove 24, and the guide slide bar 22 pops out under the action of the third spring, and slides into the spiral groove 24 along the inclined surface of its end; after the guide slide bar 22 slides to the other end of the spiral groove 24, it contacts the groove wall at the other end of the spiral groove 24 and no longer moves, thereby limiting the pressure balance block 16; and as the guide slide bar 22 slides in the spiral groove 24, the pressure balance block 16 itself rotates, converting the pressure generated by the sealing grease into a force that drives the pressure balance block 16 to move and rotate, further unloading the pressure, preventing the pressure balance block 16 from being damaged under high pressure, and reducing the impact force of the guide slide bar 22 and the spiral groove 24 under high pressure, reducing the risk of collision damage and breakage of the guide slide bar 22. When the grease injection is completed, the valve ball 4 is reset under the action of the spring, and the pressure balance block 16 is reset by pulling the connecting rod 18.

[0062] Embodiment 6:

[0063] On the basis of the above-mentioned embodiment 2, the valve body 1 further includes:

[0064] A friction block 31, which is arranged in an arc shape and is slidably connected to the lower part of the valve core 3. A plurality of friction blocks 31 are arranged evenly along the circumference of the valve core 3;

[0065] The elastic pressure plate 32 has one end connected to the inner wall of the valve body 1 and the other end connected to the friction block 31 . The elastic pressure plate 32 is tilted and applies an oblique upward pressure to the friction block 31 .

[0066] The working principle and beneficial effects of the above technical solution are:

[0067] A friction block 31 is arranged on the valve body 1. The friction block 31 is arranged to be in an arc shape adapted to the valve core 3. A plurality of friction blocks 31 are evenly pressed on the lower valve core section 42 of the valve core 3. The valve core 3 can slide in the annular space formed by the plurality of friction blocks 31, thereby limiting the movement direction of the valve core 3, reducing the left and right deviation of the lower part of the valve core 3, and improving the stability of the movement process of the valve core 3; the elastic pressure plate 32 applies an oblique upward pressure on the friction block 31, which will generate friction on the lower valve core section 31 of the valve core 3, that is, generate resistance to the movement of the valve core 3, and reduce the possibility of leakage of the grease injection valve caused by accidental movement of the valve core 3.

[0068] Embodiment 7:

[0069] On the basis of the above-mentioned embodiment 6, the movable bracket 33 is connected between the outer side of the elastic pressure plate 32 and the inner wall of the valve body 1, the movable bracket 33 is elastic and its length can be changed within a preset range, and a magnetic plate 34 is provided on the side where the elastic pressure plate 32 and the movable bracket 33 are connected, and the thickness of the magnetic plate 34 gradually increases from bottom to top.

[0070] A threaded area 35 is provided on the outer wall of the valve body 1 . The position of the threaded area 35 corresponds to the position of the movable bracket 33 . An adjusting magnetic ring 36 is screwed on the threaded area 35 . The adjusting magnetic ring 36 has a repulsive force on the magnetic plate 34 .

[0071] The working principle and beneficial effects of the above technical solution are:

[0072] An adjusting magnetic ring 36 is arranged on the valve body 1, and the adjusting magnetic ring 36 is rotated to move toward the upper part of the threaded area 35; since the thickness of the magnetic plate 34 gradually increases from bottom to top, the repulsive force between the adjusting magnetic ring 36 and the magnetic plate 34 also increases accordingly. Under the action of the magnetic force, the magnetic plate 34 moves toward the center of the valve body 1, driving the elastic pressure plate 32 to press against the friction block 31, thereby increasing the resistance of the friction block 31 to the valve core 3. Through the above structural design, according to the vibration and pressure environment of the equipment, by adjusting the position of the adjusting magnetic ring 36, the resistance encountered by the valve core 3 during the movement process is adjusted, so that the valve core 3 is not easy to shake under the current vibration and pressure environment, thereby improving the sealing performance of the grease injection valve and having better environmental adaptability.

[0073] Embodiment 8:

[0074] On the basis of the above-mentioned embodiment 1, the valve cover 2 is threadedly connected to the top of the valve body 1, and a plurality of pressure relief holes 43 are provided on the valve cover 2. A pressure relief rod 44 is connected to the center of the valve cover 2, and the pressure relief rod 44 extends to the grease injection port 45 at the top of the valve body 1; the gap between the valve cover 2 and the top of the valve body 1 is larger than the gap between the pressure relief rod 44 and the valve ball 4.

[0075] The working principle and beneficial effects of the above technical solution are:

[0076] When the pressure in the valve body 1 is too high and needs to be relieved, the valve cover 2 is rotated to reduce the gap between it and the top of the valve body 1, and the pressure relief rod 44 pushes the valve ball 4 to move downward, releasing the first-level seal; the fluid in the valve body 1 flows out through the gap between the valve ball 4 and the grease injection port 45, enters the gap between the valve cover 2 and the valve body 1, and flows out through the pressure relief hole 43 on the valve cover 2, thereby achieving the purpose of pressure relief.

[0077] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0078] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0079] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. Double-seal high-pressure grease injection valve, characterized in that: include: A valve body (1), the top cover of the valve body (1) is provided with a valve cover (2), a valve core (3) is movably provided in the valve body (1), the top of the valve core (3) is connected to a valve ball (4), a grease injection port (45) is provided at the top of the valve body (1), and a first inclined surface (46) adapted to the valve ball (4) is provided at the bottom of the grease injection port (45); a sealing plate (5) is connected to the valve core (3), an inclined surface is provided at the edge of the sealing plate (5), and a first sealing ring (6) is connected to the inclined surface, a second inclined surface (7) corresponding to the first sealing ring (6) is provided in the middle of the valve body (1), and a pressure balance chamber (8) is provided on both sides of the valve body (1).

2. The double-seal high-pressure grease injection valve according to claim 1, characterized in that: The valve core (3) comprises an upper valve core section (41) and a lower valve core section (42); a stepped surface is formed at the connection between the upper valve core section (41) and the lower valve core section (42); the upper valve core section (41) is connected to the valve ball (4); the sealing plate (5) is connected to the lower valve core section (42); a first spring groove (12) is provided at the bottom end of the lower valve core section (42); a pin (11) is inserted into the lower part of the valve body (1); a first spring (13) is connected between the pin (11) and the first spring groove (12).

3. The double-seal high-pressure grease injection valve according to claim 2, characterized in that: The bottom end of the valve ball (4) is connected to a valve ball seat (9), the bottom end of the valve ball seat (9) is provided with a second spring groove (14), the upper valve core section (41) is sleeved with a second spring (15), and the second spring (15) is connected between the stepped surface of the valve core (3) and the second spring groove (14).

4. The double-seal high-pressure grease injection valve according to claim 3, characterized in that: A pressure balancing block (16) is slidably connected in the pressure balancing chamber (8), a second sealing ring (17) is connected to the surface of the pressure balancing block (16), one end of the pressure balancing block (16) is hinged to the valve ball seat (9) via a connecting rod (18), and a pressure balancing hole (19) communicating with the external environment is arranged outside the pressure balancing chamber (8).

5. The double-seal high-pressure grease injection valve according to claim 4, characterized in that: The pressure balance block (16) comprises: A limiting slide groove (21), the limiting slide groove (21) is arranged in the middle of the outer wall of the pressure balance block (16), and a plurality of limiting slide grooves (21) are evenly arranged along the circumferential direction of the pressure balance block (16); A guide slide bar (22), one end of the guide slide bar (22) is slidably connected in the limiting slide groove (21), and the other end extends toward the notch of the limiting slide groove (21), and the length of the guide slide bar (22) is less than the length of the limiting slide groove (21); The slider (23) is connected to the guide slide bar (22) and is slidably connected to the inner wall of the limiting slide groove (21). A third spring is sleeved on the guide slide bar (22) and is connected between the slider (23) and the limiting slide groove (21).

6. The double-seal high-pressure grease injection valve according to claim 5, characterized in that: The inner wall of the pressure balance chamber (8) is provided with a spiral groove (24), and the plurality of spiral grooves (24) are evenly arranged along the circumferential direction of the pressure balance chamber (8), and the width of the spiral groove (24) is adapted to the diameter of the guide slide bar (22); the second sealing ring (17) is arranged on both sides of the limiting slide groove (21), and the width of the spiral groove (24) is smaller than the width of the second sealing rings (17) on both sides; and an inclined surface is provided at one end of the spiral groove (24) close to the pressure balance block (16).

7. The double-seal high-pressure grease injection valve according to claim 3, characterized in that: The valve body (1) also includes: A friction block (31), the friction block (31) is arranged in an arc shape and is slidably connected to the lower part of the valve core (3), and a plurality of friction blocks (31) are arranged evenly along the circumferential direction of the valve core (3); An elastic pressure plate (32), one end of which is connected to the inner wall of the valve body (1), and the other end of which is connected to the friction block (31). The elastic pressure plate (32) is arranged obliquely and applies oblique upward pressure to the friction block (31).

8. The double-seal high-pressure grease injection valve according to claim 7, characterized in that: The movable bracket (33) is connected between the outer side of the elastic pressure plate (32) and the inner wall of the valve body (1); the movable bracket (33) is elastic and its length can be changed within a preset range; a magnetic plate (34) is provided on one side where the elastic pressure plate (32) and the movable bracket (33) are connected; and the thickness of the magnetic plate (34) gradually increases from bottom to top.

9. The double-seal high-pressure grease injection valve according to claim 8, characterized in that: The outer wall of the valve body (1) is provided with a threaded area (35), the position of the threaded area (35) corresponds to the position of the movable bracket (33), an adjusting magnetic ring (36) is screwed on the threaded area (35), and the adjusting magnetic ring (36) has a repulsive force on the magnetic plate (34).

10. The double-seal high-pressure grease injection valve according to claim 1, characterized in that: The valve cover (2) is threadedly connected to the top of the valve body (1); a plurality of pressure relief holes (43) are arranged on the valve cover (2); a pressure relief rod (44) is connected to the center of the valve cover (2); the pressure relief rod (44) extends into a grease injection port (45) at the top of the valve body (1); and a gap between the valve cover (2) and the top of the valve body (1) is greater than a gap between the pressure relief rod (44) and the valve ball (4).

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