Anti-blocking grease injection valve

Abstract

The anti-blocking grease injection valve comprises a cap, a valve body, a ball body and a spring, a through hole formed by communicating an injection hole and a mounting hole is axially formed in the valve body, the ball body and the spring are arranged in the mounting hole, the ball body is tightly pressed at an orifice of the injection hole by the spring to form sealing fit, and the cap is detachably connected with one end, provided with the injection hole, of the valve body. The spring supporting piece is detachably fixed in the mounting hole, the spring supporting piece is supported at the end, away from the ball body, of the spring, at least one grease outlet channel is further formed in the spring supporting piece, and the grease outlet channel axially penetrates through the spring supporting piece; and the grease outlet channel is positioned on an axial extension line on the outer side of the spring. According to the grease injection valve, even if the spring is compressed to be completely pressed, grease can be injected through the grease outlet channel which is not shielded by the spring without entering the inner hole of the spring, so that the grease is prevented from being blocked in the grease injection valve, the grease flows smoothly, and a powerful guarantee is provided for lubrication or sealing of equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of grease injection valves, in particular to an anti-blocking grease injection valve. Background Art

[0002] Grease injection valves are commonly used in large machinery, petrochemical equipment, valve equipment, and wellhead devices. They can ensure the sealing performance or lubrication performance of the equipment by injecting grease, so that the equipment can maintain a good operating state and extend the service life of the equipment.

[0003] Conventional grease injection valves, as Figure 5 described, are composed of a valve cover 100, a valve body 200, a sphere 300, and a spring 400. After the grease is injected into the valve body 200 from the inlet of the valve body 200, the sphere 300 is pushed by the grease to separate the sphere 300 from the sealing surface of the valve body 200 and compress the spring 400. After the spring 400 is compressed, the grease enters the inner hole of the spring 400 from the outside of the spring 400 through the gaps between the coils of the spring 400, and finally flows out from the end of the spring 400 to reach the working area. However, the above-mentioned conventional grease injection valve with such a structure is only applicable to medium and low pressure and low viscosity normal temperature working conditions. If it is in an extremely cold area or a high-pressure environment, the viscosity of the grease entering the grease injection valve will increase sharply under high pressure or low temperature, resulting in poor fluidity. It is very difficult to inject the grease into the equipment. And because the viscosity of the grease increases and the fluidity decreases, increasing the grease injection pressure will only compress the spring. After the spring is compressed, the gaps between the coils close up, forming a closed annular structure of the spring, and the grease cannot enter the inner hole of the spring. Even if a larger grease injection pressure is increased, it is impossible to inject the grease smoothly, resulting in the grease being blocked in the grease injection valve, directly affecting the normal operation of the equipment. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide an anti-blocking grease injection valve that can smoothly complete the grease injection work under high-pressure and low-temperature environments.

[0005] To solve the above technical problem, the technical solution adopted by the utility model is: an anti-blocking grease injection valve, including a cap, a valve body, a sphere, and a spring. Axially inside the valve body, there is a through hole formed by connecting an injection hole and a mounting hole. The sphere and the spring are arranged in the mounting hole. The sphere is pressed by the spring against the orifice of the injection hole to form a sealing fit. The cap is detachably connected to the end of the valve body provided with the injection hole. It also includes a spring support member detachably fixed in the mounting hole. The spring support member supports the end of the spring away from the sphere. At least one grease outlet channel is further provided on the spring support member, and the grease outlet channel axially penetrates the spring support member; the grease outlet channel is located on the axial extension line outside the spring.

[0006] As an improvement to the above solution: One end of the spring supported by the spring support is a tapered end, and the tapered end is axially inserted into the spring to form a socket fit.

[0007] As an improvement to the above solution: The number of the grease outlet channels is two, and the two grease outlet channels are symmetrically arranged with the central axis of the spring support as the reference; the grease outlet channel is a groove-shaped channel axially extending on the outer peripheral surface of the spring support.

[0008] As an improvement to the above solution: The spring support is threadedly connected to the mounting hole, and the cap is threadedly connected to the valve body; a flat head or cross head screwdriver slot is provided on the end face of the spring support that is not matched with the spring.

[0009] As an improvement to the above solution: At least one pressure relief hole is provided on the cap.

[0010] As an improvement to the above solution: A sealing boss is further provided on the cap, the sealing boss is a tapered boss, and the orifice of the injection hole near the cap is a tapered groove adapted to the sealing boss.

[0011] The beneficial effects of the present utility model are as follows: By improving the structure of the grease injection valve, the present utility model adds a spring support in the grease injection valve and provides a grease outlet channel on the spring support. The grease outlet channel is located outside the spring. When the grease injection valve is under high pressure or low temperature working conditions, even if the spring is compressed to be completely pressed together, the grease can enter the inner hole of the spring and the grease injection work can be realized through the grease outlet channel not blocked by the spring, thereby avoiding the grease from being blocked in the grease injection valve. Even if the fluidity of the grease is reduced due to the influence of high pressure or low temperature working conditions, the normal grease injection work can be ensured, so that the grease flows smoothly, providing a strong guarantee for the lubrication or sealing of the equipment. Description of the Drawings

[0012] Figure 1 is a structural sectional view of the present utility model;

[0013] Figure 2 is an exploded view of the structure of the present utility model;

[0014] Figure 3 is a side view of the present utility model;

[0015] Figure 4 is a schematic diagram of the present utility model in the grease injection state;

[0016] Figure 5 is a schematic diagram of a prior art grease injection valve in the grease injection state.

[0017] The markings in the figure are: 100 - cap, 110 - pressure relief hole, 120 - sealing boss, 200 - valve body, 210 - injection hole, 220 - mounting hole, 300 - sphere, 400 - spring, 500 - spring support, 510 - grease outlet channel. Detailed implementation mode

[0018] To facilitate the understanding of the present utility model, the present utility model will be further described below with reference to the accompanying drawings.

[0019] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "front", "rear", "left", "right", "upper", "lower", "inner", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of description and does not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0020] As Figure 1 and Figure 2 shown, a spring support 500 is added to the anti-blocking grease injection valve disclosed in the present utility model on the basis of the cap 100, the valve body 200, the sphere 300 and the spring 400. A through hole for grease injection is provided inside the valve body 200 along the axial direction of the valve body 200, and this channel is composed of the injection hole 210 and the mounting hole 220 connected. One end of the valve body 200 provided with the injection hole 210 is detachably connected to the cap 100, and the cap 100 closes the inlet of the injection hole 210. When grease injection work needs to be carried out, the cap 100 is removed from the valve body 200. Both the sphere 300 and the spring 400 are arranged in the mounting hole, the sphere 300 abuts against the spring 400, and the spring 400 presses the sphere 300 against the orifice of the injection hole 210 to form a sealing fit. The orifice of the injection hole 210 cooperating with the sphere 300 can be provided with a sealing conical surface, which can improve the sealing fit effect with the sphere 300 and can play a check valve role at the same time, effectively preventing the grease injected into the valve body 200 from leaking. The spring support 500 is a cylindrical structure coaxially arranged with the mounting hole 220. The spring support 500 is used to form a support at one end where the spring 400 does not contact the sphere 300. At the same time, a grease outlet channel 510 is provided on the spring support 500, and the grease outlet channel 510 penetrates through the entire spring support 500 along the axial direction of the spring support 500 to connect the mounting hole 220 with the grease injection area through the grease outlet channel 510. The present utility model sets the grease outlet channel 510 on the spring support 500 and makes the axial extension of the grease outlet channel 510 outside the spring 400, so that no matter what state the spring 400 is in, the grease outlet channel 510 can ensure communication with the mounting hole 200. As Figure 4As shown in the figure, when the fluidity of the grease is normal, open the cap 100 and inject grease into the valve body 200 through the injection hole 210. The grease entering the injection hole 210 pushes the ball 300 backward under the injection pressure, thereby compressing the spring 400, causing the ball 300 to disengage from the injection hole 210. The normally flowing grease fills the mounting hole and then enters the grease outlet channel 510 on the spring support 500, and then flows along the grease outlet channel 510 to the greasing area for sealing or lubrication; as Figure 4 As shown in the figure, when the fluidity of the grease decreases and the viscosity increases due to low-temperature working conditions, open the cap 100 and inject grease into the valve body 200 through the injection hole 210. The grease entering the injection hole 210 pushes the ball 300 backward under the injection pressure, thereby compressing the spring 400. Due to the poor fluidity of the grease, the filling of the mounting hole 220 by the grease becomes slower. Subsequently, as the injection pressure increases, the spring 400 is gradually compressed. At this time, the grease cannot enter the inner hole of the spring 400, but under the action of the injection pressure, it can still flow into the grease outlet channel 510 of the spring support 500 from the outside of the spring 400, and then flows along the grease outlet channel 510 to the greasing area for sealing or lubrication.

[0021] Furthermore, in the present utility model, the end of the spring support 500 for supporting one end of the spring 400 is set as a conical end, so that the conical end of the spring support 500 can be inserted into the inner hole of the spring 400 to form a socket fit, thereby improving the support effect on the spring 400 and preventing the spring 400 from detaching from the spring support 500. And when the grease enters the inner hole of the spring 400, the conical surface of the conical end can also cause the grease in contact with the conical surface to flow toward the outside of the spring 400. As Figure 3 As shown in the figure, two grease outlet channels 510 are provided in the present utility model, and the two grease outlet channels 510 are symmetrically arranged with the central axis of the spring support 500 as the reference. The grease outlet channel 510 is a groove-shaped channel axially extending on the outer peripheral surface of the spring support 500. The grease guided by the conical end can flow along the conical surface to both sides of the grease outlet channels 510; and the use of the groove-shaped grease outlet channel 510 can effectively increase the grease outlet volume.

[0022] In the present utility model, threaded connections are used to achieve the detachable connection between the spring support 500 and the mounting hole 220 and the detachable connection between the cap 100 and the valve body 200. While facilitating disassembly, the mounting hole 220 can be set as a straight hole structure. As Figure 5As shown, in the grease injection valve in the prior art, generally, hemming treatment is adopted at the end of the valve body 200 to limit and support the internal spring 400. Since the spring 400 may be compressed and combined, at this time, increasing the grease injection pressure may cause the hemming to form an outward flanging, and all the internal parts of the valve body 200 are ejected, making maintenance impossible and only resulting in the scrapping of the grease injection valve. The utility model uses a threaded connection between the spring support 500 and the mounting hole 220, eliminating the hemming structure for limiting and supporting the spring 400 in the prior art and facilitating the maintenance of the grease injection valve. When external leakage occurs after the grease injection valve has been used for a long time, the spring support 500 can be directly removed, and then the sphere 300 and the spring 400 inside the valve body 200 can be taken out for cleaning, maintenance or replacement, and then reassembled to restore the overall sealing performance of the grease injection valve. In addition, as Figure 3 shown, a screwdriver slot can also be provided on the end face of the end of the spring support 500 that does not cooperate with the spring 400, so as to facilitate the disassembly of the spring support 500 with a screwdriver. The screwdriver slot can be a flat slot or a cross slot.

[0023] Furthermore, as Figure 2 shown, the utility model is provided with a pressure relief hole 110 on the cap 100. The preferred number of pressure relief holes 110 is two. By providing the pressure relief hole 110, when it is necessary to detect whether there is an internal leakage problem in the grease injection valve, it is only necessary to detect whether there is medium overflow at the pressure relief hole 110.

[0024] Furthermore, as Figure 2 shown, a sealing boss 120 protruding towards the injection hole 210 is fixed on the cap 100. The sealing boss 120 is a conical boss, and at the same time, the orifice of the injection hole 210 close to the cap 100 is set as a conical groove adapted to the sealing boss 120. After the cap 100 is connected and fixed to the valve body 200, the sealing boss 120 can be inserted into the conical groove of the injection hole 210 to form a sealing fit, thereby effectively preventing external impurities from entering the inside of the valve body 200 through the injection hole 210.

Claims

1. An anti-clogging grease injection valve, comprising a cap (100), a valve body (200), a ball (300) and a spring (400), wherein the valve body (200) is provided with a through hole axially connected to an injection hole (210) and a mounting hole (220), the ball (300) and the spring (400) are arranged in the mounting hole (220), the ball (300) is pressed by the spring (400) against the opening of the injection hole (210) to form a sealing fit, the cap (100) is detachably connected to one end of the valve body (200) provided with the injection hole (210), and the characteristics are as follows: The invention also comprises a spring support member (500) which is detachably fixed in the mounting hole (220); the spring support member (500) is supported on one end of the spring (400) away from the sphere (300); and the spring support member (500) is provided with at least one grease outlet channel (510), which axially penetrates the spring support member (500); and the grease outlet channel (510) is located on an axial extension line outside the spring (400).

2. The anti-clogging grease injection valve according to claim 1, characterized in that: One end of the spring support (500) supporting the spring (400) is a conical end, and the conical end is axially inserted into the spring (400) to form a sleeve fit.

3. The anti-clogging grease injection valve according to claim 2, characterized in that: The number of the grease outlet channels (510) is two, and the two grease outlet channels (510) are symmetrically arranged with the central axis of the spring support member (500) as a reference; the grease outlet channels (510) are groove-shaped channels extending axially on the outer peripheral surface of the spring support member (500).

4. The anti-clogging grease injection valve according to claim 1, characterized in that: The spring support member (500) is threadedly connected to the mounting hole (220), and the cover cap (100) is threadedly connected to the valve body (200); an end surface of the spring support member (500) that is not matched with the spring (400) is provided with a straight-shaped or cross-shaped screwdriver groove.

5. The anti-clogging grease injection valve according to claim 1, characterized in that: The cover cap (100) is provided with at least one pressure relief hole (110).

6. The anti-clogging grease injection valve according to claim 1, characterized in that: The cap (100) is also provided with a sealing boss (120), which is a conical boss, and the opening of the injection hole (210) close to the cap (100) is a conical groove matched with the sealing boss (120).

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