Double-ball grease injection valve

Abstract

The utility model discloses a double-ball grease injection valve which comprises a valve body, a channel for grease to pass through is formed in the valve body, a first ball body and a second ball body which can seal the channel are arranged in the channel from top to bottom, a first spring is arranged between the first ball body and the second ball body, and a second spring is arranged between the first ball body and the second ball body. A ball support is arranged at the lower end of the second ball body, a second spring is arranged at the lower end of the ball support, a blocking ring is arranged at the lower end of the second spring, the blocking ring is arranged at the lower end of the valve body, and the second spring is limited in the channel through the blocking ring. According to the grease injection valve, the double balls and the double springs are arranged in the channel in the valve body, so that double sealing inside the grease injection valve is achieved, the problem that grease or gas in equipment leaks when a certain ball or spring goes wrong is effectively solved, and the service life of the equipment is effectively prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and in particular relates to a double-ball grease injection valve. Background Art

[0002] The grease injection valve is a device for filling lubricating grease into large machinery, petrochemical equipment, ball valves, flat gate valves, wellhead devices and other equipment. It is used to add sealing grease or lubricating grease to key parts of the equipment, such as seals and bearings, so that the equipment can maintain a good operating state and extend the service life of the equipment.

[0003] At present, a grease injection valve is usually composed of a valve body, a steel ball and a spring arranged therein; when working, the spring presses the steel ball to position it, and when no grease is injected, the steel ball acts as a seal from the inside to prevent the grease or gas in the equipment from leaking out; this design method, when in use, when one of the spring or the steel ball has a problem and cannot be sealed, it will cause the grease or gas in the equipment to leak out, polluting the environment and affecting the service life of the equipment. Utility Model Content

[0004] In order to solve the problems existing in the prior art, the utility model aims to provide a double-ball grease injection valve to achieve double sealing inside the grease injection valve, effectively reducing the risk of grease or gas leakage inside the equipment, thereby increasing the service life of the equipment.

[0005] In order to achieve the above technical objectives and effects, the utility model is implemented through the following technical solutions:

[0006] A double-ball grease injection valve comprises a valve body, wherein a channel for grease to pass is formed in the valve body, a first sphere and a second sphere which can be sealed are arranged in the channel from top to bottom, a first spring is arranged between the first sphere and the second sphere, a ball holder is arranged at the lower end of the second sphere, a second spring is arranged at the lower end of the ball holder, a blocking ring is arranged at the lower end of the valve body, and the second spring is confined in the channel by the blocking ring.

[0007] Furthermore, the channel is stepped, and includes, from top to bottom, a first step portion, a second step portion, a third step portion, and a fourth step portion.

[0008] Furthermore, the diameter of the first sphere is smaller than the diameter of the second sphere.

[0009] Furthermore, the upper end of the first spring is in contact with the first sphere, and the lower end of the first spring is in contact with the second sphere.

[0010] Furthermore, a through hole penetrating the upper and lower end surfaces is provided in the ball holder.

[0011] Furthermore, the outer surface of the ball holder is stepped, including an upper step section and a lower step section, and the outer diameter of the upper step section is greater than the outer diameter of the lower step section.

[0012] Furthermore, the lower end of the second spring is connected to the blocking ring in abutting manner, and the upper end of the second spring is in abutting relation with the upper step section after the lower step section is sleeved in the inner hole thereof.

[0013] Furthermore, a valve cover is provided at the upper end of the valve body, and the valve cover is threadedly connected to the valve body.

[0014] Furthermore, a conical column capable of sealing the passage three times is arranged in the middle of the upper inner portion of the valve cover, and at least one group of air leakage holes is opened on the valve cover.

[0015] Furthermore, the first sphere and the second sphere are made of Monel K500; the first spring and the second spring are made of Inconel X-750.

[0016] The beneficial effects of the utility model are as follows: by arranging double balls and double springs in the channel of the valve body of the utility model, double sealing inside the grease injection valve is achieved, which effectively prevents the leakage of grease or gas inside the equipment when a problem occurs in a certain ball or spring, and effectively improves the service life of the equipment.

[0017] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiment of the utility model with the accompanying drawings. The specific implementation method of the utility model is given in detail by the following embodiments and their drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0019] Figure 1 This is a schematic diagram of the overall structure of the grease injection valve of the utility model;

[0020] Figure 2 It is a partial cross-sectional view of the grease injection valve of the utility model;

[0021] Figure 3 This is a cross-sectional view of the utility model after the valve cover and the blocking ring are removed;

[0022] Figure 4 This is a cross-sectional view of the valve cover of the utility model.

[0023] Explanation of the numbers in the figure: 1. valve body; 2. first sphere; 3. second sphere; 4. first spring; 5. ball holder; 6. second spring; 7. blocking ring; 8. valve cover; 11. passage; 51. through hole; 52. upper step section; 53. lower step section; 81. conical column; 82. vent hole; 111. first step portion; 112. second step portion 1; 113. third step portion; 114. fourth step portion. DETAILED DESCRIPTION

[0024] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0025] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, upper end, lower end, top, bottom...) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0026] See also Figure 1-3 As shown, a double-ball grease injection valve comprises a valve body 1, wherein the valve body 1 is provided with a channel 11 for grease to pass through, wherein the channel 11 is provided with a first sphere 2 and a second sphere 3 for sealing the same from top to bottom, wherein a first spring 4 is provided between the first sphere 2 and the second sphere 3, wherein a ball holder 5 is provided at the lower end of the second sphere 3, wherein a second spring 6 is provided at the lower end of the ball holder 5, wherein a blocking ring 7 is provided at the lower end of the second spring 6, wherein the blocking ring 7 is provided at the lower end of the valve body 1, and wherein the second spring 6 is confined within the channel 11 by the blocking ring 7.

[0027] For further information, see Figure 3 As shown, in this embodiment, the channel 11 is stepped, and includes a first step portion 111, a second step portion 112, a third step portion 113 and a fourth step portion 114 from top to bottom, wherein the aperture of the second step portion 112 is smaller than the apertures of the first step portion 111 and the third step portion 113, respectively, and the aperture of the third step portion 113 is smaller than the aperture of the fourth step portion 114; in the absence of external force, under the action of the first spring 4 and the second spring 6, the second sphere 3 blocks the connection between the third step portion 113 and the fourth step portion 114 to achieve a primary seal, and the first sphere 2 blocks the connection between the second step portion 112 and the third step portion 113 to achieve a secondary seal.

[0028] Furthermore, in the present embodiment, the diameter of the first sphere 2 is smaller than the diameter of the second sphere 3; and the upper end of the first spring 4 is connected to the first sphere 2, and the lower end of the first spring 4 is connected to the second sphere 3. It should be noted here that the above-mentioned connection can be a fixed connection or a connection in a conflicting manner. In the present embodiment, the upper end of the first sphere 2 is connected in a conflicting manner to the first sphere 2, and the lower end of the first spring 4 is connected in a conflicting manner to the second sphere 3.

[0029] For further information, see Figure 3 As shown, in this embodiment, a through hole 51 penetrating the upper and lower end surfaces is opened in the ball holder 5, and the through hole 51 is connected to the channel 11; and the outer surface of the ball holder 5 is stepped, including an upper step section 52 and a lower step section 53, and the outer diameter of the upper step section 52 is greater than the outer diameter of the lower step section 53.

[0030] For further information, see Figure 2-3 As shown, in the present embodiment, the lower end of the second spring 6 is connected to the blocking ring 7, and the upper end of the second spring 6 is connected to the upper step section 52 after the lower step section 53 is sleeved in its inner hole. It should be noted here that the above-mentioned connection, like the first spring 4, can be a fixed connection or a connection in a contacting manner. In the present embodiment, the lower end of the second spring 6 is connected in a contacting manner with the blocking ring 7, and the upper end of the second spring 6 is sleeved in the inner hole of the lower step section 53 and contacts the upper step section 52.

[0031] For further information, see Figure 4 As shown, in this embodiment, a valve cover 8 is provided at the upper end of the valve body 1, and the valve cover 8 is threadedly connected to the valve body 1 to facilitate the disassembly of the valve cover 8; a conical column 81 that can seal the channel 11 three times is provided in the middle of the upper inner part of the valve cover 8, and two groups of air leakage holes 82 are opened on the valve cover 8, and the two groups of air leakage holes 82 are symmetrically arranged on the valve cover 8 with the center of the conical column 81. The air leakage holes 82 can be used to loosen the valve cover 8 to release air during normal maintenance; it should be noted here that the number and manner of setting the above-mentioned air leakage holes 82 are only one embodiment, and are not intended to limit the scope of the present application. When setting, more or less air leakage holes 82 can be set, and they can be distributed in other ways, but the number of air leakage holes 82 set must be at least one group; in addition, it should be noted that, see Figure 2 As shown, when the valve cover 8 is installed on the valve body 1, the conical column 81 partially penetrates into the channel 11 to seal the channel 11. In order to facilitate the penetration of the conical column 81, the upper end of the first step portion 111 in the channel 11 is provided with a slope adapted to the conical column 81.

[0032] Furthermore, in this embodiment, the material of the first sphere 2 and the second sphere 3 is Monel K500; the material of the first spring 4 and the second spring 6 is Inconel X-750.

[0033] The working principle of the utility model is as follows:

[0034] When in use, the grease injection valve is installed in the equipment; when grease injection is required, the valve cover 8 is first removed from the valve body 1; then grease is injected into the channel 11 through the first step portion 111, and as the grease injection pressure increases, the first sphere 2 is first pushed downward to connect the second step portion 112 and the third step portion 113, so that the grease enters the third step portion 113 through the second step portion 112, and then the second sphere 3 is pushed downward to connect the third step portion 113 and the fourth step portion 114, so that the grease enters the fourth step portion 114 through the third step portion 113, and after flowing through the through hole 51, it is injected into the equipment through the fourth step portion 114; at this time, the first spring 4 and the second spring 6 are compressed.

[0035] When the grease injection is completed and the grease injection into the channel 11 is stopped, the second sphere 3 moves upward under the action of the rebound force of the first spring 4 and the second spring 6, and the connection between the third step portion 113 and the fourth step portion 114 is blocked again to achieve a primary seal. At the same time, the first sphere 2 also moves upward to block the connection between the second step portion 112 and the third step portion 113 to achieve a secondary seal. Then the valve cover 8 is reinstalled on the valve body 1, so that the conical column 81 partially penetrates into the first step portion 111 in the channel 11 to achieve a tertiary seal.

[0036] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A double-ball grease injection valve, comprising a valve body (1), wherein a passage (11) is provided in the valve body (1) for grease to pass through, characterized in that: A first sphere (2) and a second sphere (3) are arranged in the passage (11) from top to bottom to seal the passage (11); a first spring (4) is arranged between the first sphere (2) and the second sphere (3); a ball holder (5) is arranged at the lower end of the second sphere (3); a second spring (6) is arranged at the lower end of the ball holder (5); a blocking ring (7) is arranged at the lower end of the second spring (6); the blocking ring (7) is arranged at the lower end of the valve body (1); and the second spring (6) is restricted in the passage (11) by the blocking ring (7).

2. The double-ball grease injection valve according to claim 1, characterized in that: The channel (11) is in a stepped shape, and comprises, from top to bottom, a first step portion (111), a second step portion (112), a third step portion (113) and a fourth step portion (114).

3. The double-ball grease injection valve according to claim 1 or 2, characterized in that: The diameter of the first sphere (2) is smaller than the diameter of the second sphere (3).

4. The double-ball grease injection valve according to claim 1, characterized in that: The upper end of the first spring (4) is in contact with the first sphere (2), and the lower end of the first spring (4) is in contact with the second sphere (3).

5. The double-ball grease injection valve according to claim 1, characterized in that: The ball holder (5) is provided with a through hole (51) penetrating the upper and lower end surfaces.

6. The double-ball grease injection valve according to claim 5, characterized in that: The outer surface of the ball holder (5) is stepped, comprising an upper step section (52) and a lower step section (53), and the outer diameter of the upper step section (52) is greater than the outer diameter of the lower step section (53).

7. The double-ball grease injection valve according to claim 6, characterized in that: The lower end of the second spring (6) is connected to the blocking ring (7) in abutment with each other, and the upper end of the second spring (6) is connected to the upper step section (52) after the lower step section (53) is sleeved in its inner hole.

8. The double-ball grease injection valve according to claim 1, characterized in that: A valve cover (8) is provided at the upper end of the valve body (1), and the valve cover (8) is threadedly connected to the valve body (1).

9. The double-ball grease injection valve according to claim 8, characterized in that: A conical column (81) capable of sealing the passage (11) three times is arranged in the middle of the upper inner portion of the valve cover (8), and at least one group of air leakage holes (82) is opened on the valve cover (8).

10. The double-ball grease injection valve according to claim 1, characterized in that: The material of the first sphere (2) and the second sphere (3) is Monel K500; the material of the first spring (4) and the second spring (6) is Inconel X-750.

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