Double seal high pressure grease injection valve

Abstract

The present invention relates to the technical field of petroleum equipment, and discloses a double-seal high-pressure grease injection valve, comprising: a valve body, a valve cover provided on the top cover of the valve body, a valve core movably provided in the valve body, a valve ball connected to the top of the valve core, a grease injection port provided on the top of the valve body, a first inclined surface adapted to the valve ball provided at the bottom of the grease injection port; a sealing plate connected to the valve core, an inclined surface provided on the edge of the sealing plate, and a first sealing ring connected to the inclined surface, a second inclined surface corresponding to the first sealing ring provided in the middle of the valve body, and a pressure balancing chamber provided on both sides of the valve body. The present invention forms a double-seal structure of the high-pressure grease injection valve, which, when used in high-pressure equipment such as petroleum, can utilize the pressure in the equipment 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; a pressure balancing chamber is used 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.

Description

Technical Field

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

[0002] Grease injection valves are a crucial component of petrochemical equipment. For example, slab gate valves and ball valves used in oil and gas field production and transportation processes are equipped with grease injection valves. To maintain optimal equipment operation, routine valve maintenance involves injecting sealing grease through these valves to protect the valve's internal structure, prevent leakage, and extend the equipment's service life.

[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 sealing grease.

[0004] In the prior art, utility model patent application number CN202222965292.5 discloses a new high-pressure grease injection valve, comprising a body, an internally disposed limit mechanism, and a spring. The limit mechanism comprises a spring disposed within the body, the lower end of the spring being connected to the inner wall of the body, and the upper end of the spring being connected to a fixed plate. Due to the structural design of the limit mechanism, the limit frame, due to its fixed position, acts as a guide and limiter for the limit rod, thereby constraining the movement of the fixed plate through the limit rod, thereby preventing the spring from deflecting during compression and rebound. This grease injection valve utilizes a single-stage sealing structure. Even though the limit structure reduces deflection, the sealing performance will still degrade in actual use under conditions of vibration and frequent opening and closing, leading to leakage and failure of the grease injection valve.

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

[0006] The Summary of the Invention introduces a series of simplified concepts that will be further described in the Detailed Description of the Invention. The Summary of the Invention is not intended to limit the key features and essential features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

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

[0008] The valve body, the top cover of the valve body is provided with a valve cover, a valve core is movably provided in the valve body, the top of the valve core is connected with a valve ball, the top of the valve body is provided with a grease injection port, and the bottom of the grease injection port is provided with a first inclined surface adapted to the valve ball; a sealing plate is connected to the valve core, an inclined surface is provided 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 provided in the middle of the valve body, and a pressure balancing chamber is provided 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 stepped 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] The limiting chute is set in the middle of the outer wall of the pressure balance block, and multiple limiting chute 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 groove, and the other end of which extends toward the notch of the limiting slide groove, and the length of the guide slide bar is less than the length of the limiting slide groove;

[0015] The slider is connected to the guide slide bar and is slidably connected to the inner wall of the limiting slide groove. A third spring is sleeved on the guide slide bar and 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 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 provided and are evenly arranged 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. A magnetic plate is provided on the 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 provided on the valve cover, a pressure relief rod is connected to the center of the valve cover, and the pressure relief rod extends to 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 balancing chamber is adopted to regulate the pressure in the valve body during grease injection, ensuring the 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, and 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 those skilled in the art 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 This is a schematic structural diagram of a cross-section of a double-seal high-pressure grease injection valve according to the present invention;

[0028] Figure 2 This 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 1Schematic diagram of the local enlarged structure at A in the middle;

[0030] Figure 4 For the present invention Figure 1 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 sliding 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. Limiting 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 will be further described in detail below with reference to 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 preclude the existence or addition of one or more other elements or combinations thereof.

[0035] Example 1:

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

[0037] The valve body 1 has a valve cover 2 on the top end thereof, 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 on 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 on 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 balancing 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-seal high-pressure grease injection valve, wherein a first inclined surface 46 is provided 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, thus forming a first-level seal of the high-pressure grease injection valve; a sealing plate 5 is provided 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, thus sealing the middle of the valve body 1, thus 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 removed 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, thereby generating a gap 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, thereby generating a gap 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, thereby forming 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 setting of the pressure balance chamber 8 is adopted 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 in a high-pressure environment.

[0041] Example 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. 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, 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 mounted on the lower spool section 42 of the valve core 3 and connected to the pin 11. This spring 13 provides elastic force for the entire valve core 3. When grease injection is not in progress, the elastic force of the first spring 13 maintains the upward movement of the sealing plate 5, allowing the first sealing ring 6 to maintain close contact with the second inclined surface 7. When the valve ball 4 drives the valve core 4, the elastic force of the first spring 13 must be overcome to allow the valve core 4 to drive the sealing plate 5 downward, releasing the secondary seal of the high-pressure grease injection valve. This structure improves the sealing effect of the grease injection valve and provides power for the valve core 3 to reset.

[0045] Example 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] A second spring 15 is mounted on the upper spool section 41 of the valve core 3 and connected to the valve ball seat 9. This second spring 15 provides elastic force for the valve ball 4. When grease injection is not in progress, the spring force of the second spring 12 forces the valve ball 4 to maintain its upward motion, ensuring close contact between the valve ball 4 and the first inclined surface 46. When the valve ball 4 drives the valve core 4, the spring force of the second spring 15 must be overcome to allow the valve ball 4 to move downward, releasing the primary seal of the high-pressure grease injection valve.

[0049] By setting up two sets of springs to provide elastic force for the two-stage seal, the grease injection valve can still maintain sealing even if the elastic force of any set of springs is lost; for example, after long-term use, when the valve body 1 wears, 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] Example 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 balancing chamber 8 is arranged between the valve ball 4 and the sealing plate 5 to regulate the pressure in 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 balancing block 16 to move outward along the inner wall of the pressure balancing chamber 8, maintaining the pressure balance in the upper space of the valve body 1 during grease injection; when subjected to an instantaneous high-pressure impact, the valve ball 4 squeezes 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; when the pressure balancing block 16 moves to the preset position, the sealing grease fills the valve body 1 to increase its internal pressure, thereby squeezing the sealing plate 5 to move; when the pressure balancing block 16 moves, the air outside the pressure balancing chamber 8 is pressed out from the pressure balancing hole 19; the second sealing ring 17 on the surface of the pressure balancing block 16 can prevent the sealing grease from flowing out of the pressure balancing 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 be reset and sealed more accurately after the grease injection is completed.

[0054] Example 5:

[0055] Based on the above embodiment 4, the pressure balance block 16 includes:

[0056] The limiting chute 21 is provided in the middle of the outer wall of the pressure balance block 16, and a plurality of limiting chute 21 are evenly arranged along the circumference of the pressure balance block 16;

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

[0058] The slider 23 is connected to the guide slide 22 and is slidably connected to the inner wall of the limiting slide groove 21. A third spring is sleeved on the guide slide 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. 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 the 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 22 is squeezed into the limiting groove 21. When the pressure balance block 16 slides to the preset position, the guide slide 22 aligns with one end of the spiral groove 24. Under the action of the third spring, the guide slide 22 pops out and slides along the inclined surface at its end into the spiral groove 24. After sliding to the other end of the spiral groove 24, the guide slide 22 contacts the groove wall at the other end of the spiral groove 24 and stops moving, thereby limiting the pressure balance block 16. As the guide slide 22 slides within the spiral groove 24, the pressure balance block 16 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 damage to the pressure balance block 16 under high pressure, and reducing the impact force between the guide slide 22 and the spiral groove 24 under high pressure, thereby reducing the risk of damage and breakage of the guide slide 22. When grease injection is completed, the valve ball 4 is reset under the action of the spring, pulling the pressure balance block 16 back to its original position via the connecting rod 18.

[0062] Example 6:

[0063] Based on the above embodiment 2, the valve body 1 further includes:

[0064] The friction block 31 is configured to be arc-shaped and is slidably connected to the lower portion of the valve core 3. There are multiple friction blocks 31 and they are evenly arranged 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 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 provided on the valve body 1. The friction block 31 is set to an arc shape that adapts to the valve core 3. Multiple friction blocks 31 are evenly pressed on the lower valve core section 42 of the valve core 3. The valve core 3 can slide along the annular space formed by multiple 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 valve core 3 movement process; 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, it will generate resistance to the movement of the valve core 3, reducing the possibility of accidental movement of the valve core 3 causing leakage of the grease injection valve.

[0068] Example 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 vary within a preset range. A magnetic plate 34 is provided on the side where the elastic pressure plate 32 and the movable bracket 33 are connected. 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 onto 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 provided on the valve body 1, and is rotated to move it toward the upper portion of the threaded area 35. As 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. 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 this structural design, the resistance to the movement of the valve core 3 is adjusted by adjusting the position of the adjusting magnetic ring 36 according to the vibration and pressure environment in which the equipment is located. This makes the valve core 3 less likely to shake under the current vibration and pressure environment, thereby improving the sealing performance of the grease injection valve and improving its environmental adaptability.

[0073] Example 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 greater 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 downward to release 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 should 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" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to 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 specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0079] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and 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 illustrations shown and described herein.

Claims

1. Double-seal high-pressure grease injection valve, characterized in that: include: A valve body (1), a valve cover (2) is provided on 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 on 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 on 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); 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 valve core (3) 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); 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) communicating with the external environment is provided on the outside of the pressure balancing chamber (8).

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); a second spring (15) is sleeved on the upper valve core section (41); a 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 1, characterized in that: The pressure balance block (16) comprises: A limiting chute (21), the limiting chute (21) is arranged in the middle of the outer wall of the pressure balance block (16), and a plurality of limiting chute (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 to 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). The guide slide bar (22) is sleeved with a third spring, and the third spring is connected between the slider (23) and the limiting slide groove (21).

4. The double-seal high-pressure grease injection valve according to claim 3, 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).

5. The double-seal high-pressure grease injection valve according to claim 1, characterized in that: The valve body (1) also includes: A friction block (31) is configured to be arc-shaped and is slidably connected to the lower portion of the valve core (3). A plurality of friction blocks (31) are configured and are evenly arranged along the circumference of the valve core (3); An 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).

6. The double-seal high-pressure grease injection valve according to claim 5, 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. The thickness of the magnetic plate (34) gradually increases from bottom to top.

7. The double-seal high-pressure grease injection valve according to claim 6, 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), and 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).

8. 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 provided 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). 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).

Images