A grease injection structure applicable to buried valves

Abstract

The present invention discloses a grease injection structure applicable to buried valves, which solves the problems that the grease injection channel is prone to blockage after grease injection and the maintenance frequency is relatively high for existing buried valves. The present invention includes a grease injection channel and an oil injection channel. The grease injection channel has a grease injection port, a grease outlet, and a connection port that are interconnected. The grease outlet is used to communicate with the grease inlet of the buried valve. The oil injection channel has an oil outlet and an oil injection port, and the oil outlet is connected to the connection port through a check valve. The present invention has the advantages of being able to reduce the residual amount of grease in the grease injection channel to prevent grease blockage, reducing the maintenance frequency of buried valves, having a simple structure, and a relatively low cost, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of natural gas production, and particularly to a grease injection structure applicable to buried valves. Background Art

[0002] During the use of ball valves installed in gas transmission stations and valve chambers, the grease injection channels (including grease injection nozzles) are prone to blockage due to impurities in the pipeline medium and hardening of the grease injection material. This involves the use of some buried valves. In gas transmission projects, pipelines are usually buried underground. In some pipe sections where the gas flow needs to be controlled, buried ball valves need to be installed. The valve body of the buried ball valve is buried underground, while other control components, such as switches, grease injection channels, and sewage discharge channels, are exposed above the ground for easy operation by workers. However, since the valve body is buried underground, its maintenance is difficult. For example, due to the working environment of the buried ball valve being underground, and as the burial depth of the gas transmission pipeline increases, the grease injection channel also needs to be lengthened accordingly. After grease injection, the residual amount of grease in the grease injection channel is relatively large. Due to the buried environment, the grease is prone to hardening and causing blockage of the grease injection channel. At this time, if the grease injection channel needs to be replaced, it is necessary to excavate the buried area, expose the entire buried ball valve, and then replace or maintain the grease injection channel, which is difficult and costly to maintain. Summary of the Invention

[0003] The technical problem to be solved by the present invention is how to prevent the grease from hardening in the grease injection channel, avoid blockage of the grease injection channel by the grease, and reduce the maintenance frequency of the grease injection channel in the buried valve. The purpose is to provide a grease injection structure applicable to buried valves.

[0004] The present invention is achieved by the following technical solutions:

[0005] A grease injection structure applicable to a buried valve includes a grease injection channel and an oil injection channel. The grease injection channel has a grease injection port, a grease outlet, and a connection port that are interconnected. The grease outlet is used to communicate with the grease inlet of the buried valve. The oil injection channel has an oil outlet and an oil injection port, and the oil outlet is connected to the connection port through a check valve.

[0006] The present invention mainly avoids blockage of the grease injection channel by cleaning the grease in the grease injection channel. The grease injection channel can be essentially understood as a multi-way pipe, where two openings serve as the grease injection port and the grease outlet, and the other openings are connected to the oil injection channel through check valves. Of course, in the present invention, the number of other openings is 1, that is, the oil outlet. Due to the presence of the check valve, the oil injection channel is equivalent to a single-flow channel. When the expected amount of grease is injected into the buried valve through the grease injection channel, the injection of grease is stopped. At this time, lubricating oil is injected through the oil injection channel, and the lubricating oil enters the grease injection channel through the check valve, so that the lubricating oil forces the grease to be discharged from the grease injection port.

[0007] Through the setting of the grease injection channel and the check valve, the grease injection structure provided by the present invention can directly clean the grease injection channel after the grease injection is completed, thereby preventing the hardening of the grease in the grease injection channel and avoiding the blockage of the grease injection channel. The grease injection structure provided by the present invention is equivalent to integrating grease injection and maintenance, and the maintenance is timely, with high maintenance effectiveness, thus avoiding the blockage of the grease in the grease injection channel, reducing the maintenance work, and lowering the maintenance cost. For the grease injection structure provided by the present invention, both the grease injection port and the grease injection port can be set above the ground, and the lengths of the grease injection channel and the grease injection channel can be adjusted according to the buried depth of the buried valve, so that the present invention has the characteristics of convenient operation and wide applicability. The grease injection structure provided by the present invention has a simple structure, is easy to manufacture, and has a low manufacturing cost.

[0008] Of course, in the present invention, the grease injection channel can also be used as the injection channel for other fluids, and the corresponding grease injection channel can also be used as the injection channel for other fluids. For example, when the grease injection amount reaches the expected amount, stop the grease injection amount, and first inject the grease cleaning liquid through the grease injection channel. After injecting a certain amount of cleaning liquid, inject a certain amount of lubricating oil. The function of the cleaning liquid is to prevent the grease from adhering to the grease injection channel, reduce the injection amount and injection times of the lubricating oil, and the injection of the lubricating oil can also prevent the grease injection pipeline from being corroded, which is beneficial to the next grease injection.

[0009] Preferably, there are at least two grease injection channels, and each grease injection channel is respectively communicated with the oil injection channel through a one-way valve. Some buried valves usually have multiple grease injection ports. In the prior art, the grease injection operation is usually carried out in a form of one-to-many, that is, through a single grease injection main channel for shunting, and the different grease injection ports are respectively greased to improve the grease injection efficiency and reduce the maintenance workload. In this grease injection form, there are: when the grease body is shunted from the main channel to the branch channels, the degree of hardening of the grease body in each branch channel is different, and the flow characteristics of the fluid always travel towards the path with less resistance. Over time, it is easy to cause the grease body in individual branch channels to be completely hardened, resulting in the blockage of the branch channels. At this time, only by excavating the buried part of the buried valve can the buried valve be exposed for maintenance. Moreover, since the working environment of the buried valve is underground, even if control components with controllable flow directions are set in each branch channel, due to the special underground environment, it is extremely difficult to perform selective grease injection, and at the same time, the cost will also increase accordingly. In this solution, each grease injection channel is independent, that is, the grease injection ports of each grease injection channel are independent and can be selectively injected, avoiding the hidden danger of the cumulative effect of grease hardening in the branch channels, and at the same time, the grease body can be injected at a fixed grease inlet of the buried valve, and the injection method is flexible. In addition, the independent setting of each grease injection channel in this solution also meets the cooperation with the oil injection channel: after the grease injection is completed, the grease needs to flow out in the reverse direction of the lubricating oil. Therefore, each grease injection channel should be provided with an independent grease injection port to prevent the injected grease from being mixed with the lubricating oil in large quantities. During grease injection, this solution can also meet the simultaneous injection of multiple grease inlets and the fixed-point injection of a single grease inlet: when multiple grease inlets need to be injected simultaneously, the grease injection ports of each grease injection channel can be connected through a multi-way pipe to perform a one-to-many grease injection method. After the grease injection is completed, the multi-way pipe is removed, and oil is injected through the oil injection channel to clean the grease body in each grease injection channel; when a single grease inlet needs to be injected at a fixed point, only the other grease inlets need to be blocked, and after the grease injection is completed, oil is injected through the oil injection channel to clean the grease body of the single grease inlet.

[0010] Preferably, the grease injection channel is coaxially located within the oil injection channel, an annulus is formed between the grease injection channel and the oil injection channel, the connection port is communicated with the annulus through a one-way valve, and the grease outlet passes through the wall of the oil injection channel and is located outside the oil injection channel. This solution integrates the grease injection channel and the oil injection channel. On the one hand, it can reduce the assembly work and is easy to disassemble and assemble during maintenance. On the other hand, the grease itself has a certain viscosity, so the material of the grease injection channel is generally selected to be relatively smooth. However, the general grease injection channel is completely exposed to the soil. Due to the moisture in the soil and a large amount of other acidic and alkaline substances, the grease injection channel is easily corroded in the soil, so the service life of the grease injection channel is extremely limited. After the grease injection channel is sleeved into the oil injection channel, the oil injection channel protects the grease injection channel, reducing the corrosion effect to a certain extent. And after each cleaning of the grease, a large amount of lubricating oil will still remain in the annulus, further preventing the grease injection channel from being eroded and protecting the grease injection channel, thus ensuring the service life of the grease injection channel. Indirectly, due to the socket connection between the grease injection channel and the oil injection channel, the material selection of the grease injection channel can choose materials with lower property requirements, thereby reducing the manufacturing cost of the grease injection structure.

[0011] Furthermore, the grease injection channel and the oil injection channel are integrally formed structures. This solution mainly considers the corrosiveness of the underground environment to the sealing structure. If the grease injection channel and the oil injection channel adopt a connected structure, a sealing component is required to seal the connection between the two. Due to the influence of moisture or other acidic and alkaline substances in the underground environment, the sealing component is easily corroded and the sealing fails, resulting in the erosion of the grease injection channel. Adopting an integrally formed structure, the anti-corrosion performance of the grease injection structure completely depends on the material itself, thus ensuring the service life of the grease injection structure. And during maintenance and replacement, it can also reduce the installation of the sealing component, reduce the assembly work, and improve the maintenance efficiency.

[0012] Preferably, the grease outlet is detachably connected to the grease injection channel. During the oil injection process, the probability of the presence of grease at the grease outlet is greater than that at other places in the grease injection channel, that is, the cleaning of the grease at the grease outlet is relatively easy to leave residues, so the probability of blockage at the grease outlet is relatively high. Detachably connecting the grease outlet to the grease injection channel can replace the grease outlet separately, reducing the maintenance cost.

[0013] Preferably, the grease injection channel is equipped with a heating device. Configuring a heating device can heat the grease in the grease injection channel, thereby reducing the viscosity of the grease, facilitating the injection of the grease, and improving the injection efficiency of the grease. At the same time, the temperature of the grease rises to neutralize the underground temperature, preventing the grease from accelerating hardening due to too low underground temperature, and facilitating the cleaning of the grease by the lubricating oil.

[0014] Preferably, the grease injection channel is configured with a vibrator. The vibrator can vibrate the grease in the grease injection channel, reduce the adhesion of the grease to the wall of the grease injection channel, and facilitate the injection of the grease.

[0015] Furthermore, the vibrator is an ultrasonic vibrator. Using an ultrasonic vibrator can avoid the vibration of the grease injection channel itself, prevent the loosening of the grease injection channel, and ensure the service life of the grease injection channel.

[0016] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0017] 1. A grease injection structure applicable to an underground valve provided by the present invention can directly clean the grease injection channel after grease injection through the oil injection channel and in cooperation with the check valve, thereby preventing the hardening of the grease in the grease injection channel and avoiding the blockage of the grease injection channel.

[0018] 2. A grease injection structure applicable to an underground valve provided by the present invention is equivalent to an integrated grease injection and maintenance structure, and the maintenance is timely, with high maintenance effectiveness, thereby avoiding the blockage of the grease in the grease injection channel, reducing the maintenance work, and lowering the maintenance cost.

[0019] 3. A grease injection structure applicable to an underground valve provided by the present invention can have both the grease injection port and the oil injection port located above the ground, and the lengths of the grease injection channel and the oil injection channel can be adjusted according to the buried depth of the underground valve, so that the present invention has the characteristics of convenient operation and wide applicability.

[0020] 4. A grease injection structure applicable to an underground valve provided by the present invention has a simple structure, is easy to manufacture, and has a low manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of this application, and do not limit the embodiments of the present invention. In the drawings:

[0022] Figure 1 It is a schematic structural diagram of an embodiment provided by the present invention.

[0023] Figure 2 It is a schematic structural diagram of another embodiment provided by the present invention.

[0024] Figure 3 It is a schematic structural diagram of another embodiment provided by the present invention.

[0025] Figure 4 It is a schematic structural diagram of another embodiment provided by the present invention.

[0026] Marks in the drawings and corresponding component names:

[0027] 1 - Grease injection channel, 2 - Oil injection channel, 3 - Check valve, 4 - Grease injection nozzle, 5 - Oil injection nozzle, 6 - Buried valve, 7 - Grease inlet, 8 - Heating device, 9 - Gas transmission pipeline, 10 - Grease injection port, 11 - Connection port, 12 - Grease outlet connection end, 13 - Oil injection port, 14 - Oil outlet, 15 - Grease outlet, 16 - Sealing assembly, 17 - Annulus. Detailed implementation mode

[0028] To make the purpose, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with embodiments and drawings. The illustrative implementation modes and descriptions of the present invention are only used to explain the present invention and do not limit the present invention.

[0029] Embodiment

[0030] A grease injection structure applicable to a buried valve, as Figure 1 shown, includes a grease injection channel 1 and an oil injection channel 2. The grease injection channel 1 has a grease injection port 10, a grease outlet 15 and a connection port 11 that communicate with each other. The grease outlet 15 is used to communicate with the grease inlet 7 of the buried valve 6. The oil injection channel 2 has an oil outlet 14 and an oil injection port 13. The oil outlet 14 is connected to the connection port 11 through a check valve 3.

[0031] During use, connect the grease injection structure provided in this embodiment to the grease inlet 7 of the buried valve 6 through the connection end of the grease outlet 15, and bury the buried valve 6 underground. The grease injection channel 1 and the oil injection channel 2 can use hoses or rigid bent pipes, and their lengths can be reasonably selected according to the burial depth of the buried valve 6, as long as it is ensured that after the buried valve 6 is buried to the preset depth, the grease injection port 10 and the oil injection port 13 are exposed above the ground, so as to facilitate the grease injection and oil injection operations of the staff, and at the same time facilitate the maintenance, repair, etc. of the grease injection port 10 and the oil injection port 13. When injecting grease, inject the grease with high pressure through the grease injection port 10. The grease enters the grease injection channel 1. Due to the presence of the check valve 3, the grease will not enter the oil injection channel 2, but all enters the grease outlet connection end 12 through the grease outlet 15, and then enters the buried valve 6 through the grease inlet 7 of the buried valve 6. After injecting the preset amount of grease, stop injecting the grease and make the grease injection port 10 non-pressurized. Inject lubricating oil into the oil injection channel 2 through the oil injection port 13. The lubricating oil enters the check valve 3 through the oil outlet 14. By continuously injecting oil, the lubricating oil squeezes out the grease from the grease injection port 10, so as to clean the grease in the grease injection channel 1. During the grease cleaning process, a large amount of lubricating oil discharged from the grease outlet 15 can be used as a sign of the completion of cleaning.

[0032] This embodiment realizes the integration of grease injection and maintenance structure, and the maintenance of the grease injection pipeline is carried out without excavation. For the maintenance of the buried valve 6, generally, the soil is excavated to expose the buried valve 6, so as to carry out the maintenance of the buried valve 6. Each maintenance has a large workload, a long maintenance time, and a high maintenance cost. Since most of the grease injection channels 1 will be buried underground, in the installation project of the buried valve 6, the anti-blocking measures are implemented at the grease injection port 10 of the grease injection channel 1, mainly to prevent external conditions such as dust, impurity debris, etc. from entering the grease injection channel 1, but the problem of grease caking in the grease injection channel 1 is not noticed. Therefore, during the grease injection process of the buried valve 6, the grease injection time often increases with the increase of the number of grease injections to ensure the amount of injected grease. However, when grease caking first appears in the grease injection channel 1, during the subsequent grease injection process, the amount of grease caking will increase in an approximately quadratic curve. Therefore, the existing maintenance frequency of excavating the buried valve 6 is generally high. This embodiment realizes the integration of grease injection and maintenance structure, that is, after the grease injection is completed and before the grease is completely caked, the grease in the grease injection channel 1 is cleaned to prevent the grease from caking in the grease injection channel 1 to block the grease injection channel 1, so as to reduce the maintenance frequency of excavating the buried valve 6. This embodiment only uses the oil injection channel 2, the one-way valve 3 and the grease injection channel 1 to cooperate to realize the cleaning of the above-ground grease injection channel 1 after grease injection. The structure is simple, the cost is low, the cleaning is convenient, and the maintenance efficiency is high. Moreover, through the setting of the oil injection channel 2, injecting lubricating oil through the oil injection channel 2 after the grease injection can also play a maintenance role in the grease injection channel 1, thus ensuring the service life of the grease injection channel 1, reducing the replacement frequency of the grease injection channel 1, and reducing the maintenance cost. Even more, with the grease injection structure provided by this embodiment, the blockage in the grease injection channel 1 only occurs at the corner of the grease outlet 15. When the buried valve 6 is excavated for maintenance, compared with the grease blockage in the grease injection channel 1, the maintenance is more convenient and fast, and the maintenance cost is reduced.

[0033] In a possible embodiment, the number of the grease injection channels 1 is set to at least two, and the connection ports 11 of each grease injection channel 1 are respectively communicated with the oil injection channel 2 through the one-way valve 3. In an example, such as Figure 3As shown, the buried valve 6 is buried underground and cooperatively connected with the gas transmission pipeline 9. The buried valve 6 has two grease inlets 7, and the two grease inlets 7 are respectively communicated with the grease outlets 15 of two grease injection channels 1. The grease inlets 7 of the grease injection channels 1 are connected with the grease injection nozzles 4 to facilitate the injection of the grease body. The chain structure of the grease injection channel 1 is communicated with the oil outlet 14 of the oil injection channel 2 through a one-way valve 3. The corresponding oil outlets 14 of the two grease injection channels 1 are respectively communicated with the oil injection channel 2. The oil injection port 13 of the oil injection channel 2 is connected with an oil injection nozzle 5 to facilitate the injection of lubricating oil. In this embodiment, each grease injection channel 1 is independent, that is, the grease inlets 10 of each grease injection channel 1 are independent and can be selectively injected, avoiding the hidden danger of the agglomeration and accumulation effect of the grease body in the branch channel, and at the same time, the grease body can be injected into the fixed grease inlet 7 of the buried valve 6, and the injection method is flexible. Moreover, the independent setting of each grease injection channel 1 in this embodiment also meets the cooperation with the oil injection channel 2: after the grease injection is completed in the grease injection channel 1, the reverse outflow of lubricating oil is required, so each grease injection channel 1 should be provided with an independent grease inlet 10 to prevent the injected grease body from being mixed with a large amount of lubricating oil. When injecting grease, this embodiment can also meet the simultaneous injection of multiple grease inlets 7 and the fixed-point injection of a single grease inlet 7: when multiple grease inlets 7 need to be injected simultaneously, the grease inlets 10 of each grease injection channel 1 can be connected through a multi-way pipe, so as to perform a one-to-many grease injection method. After the grease injection is completed, the multi-way pipe is removed, and oil is injected through the oil injection channel 2 to clean the grease body in each grease injection channel 1; when a single grease inlet 7 needs to be injected at a fixed point, only the other grease inlets 7 need to be blocked. After the grease injection is completed, oil is injected through the oil injection channel 2 to clean the grease body of the single grease inlet 7. In the working condition where multiple grease inlets 7 need to be injected simultaneously, the oil outlets 14 communicated with each grease injection channel 1 in the oil injection channel 2 should be arranged at the same height on the oil injection channel 2, and the lengths of the grease injection channels 1 should be ensured to be equal, so as to ensure that the pressures of each oil outlet 14 are equal, and further achieve the purpose of simultaneously cleaning multiple grease injection channels 1.

[0034] In a possible embodiment, the grease injection channel 1 is coaxially located in the oil injection channel 2, and an annulus 17 is formed between the grease injection channel 1 and the oil injection channel 2. The connection port 11 is communicated with the annulus 17 through a one-way valve 3, and the grease outlet 15 passes through the wall of the oil injection channel 2 and is located outside the oil injection channel 2. Specifically, as Figure 2 、 Figure 4As shown, the grease injection channel 1 adopts a tee structure. The connection port 11 of the grease injection channel 1 is communicated with the one-way valve 3. The oil injection channel 2 adopts a round tube with one end sealed. A connection hole for the grease outlet 15 of the grease injection channel 1 to pass through is opened on the side wall of the oil injection channel 2. The oil injection channel 2 is sleeved outside the grease injection channel 1 through the opening at its other end. The grease outlet 15 passes through the connection port 11 and is located outside the oil injection channel 2 for communicating with the grease inlet 7 of the buried valve 6. The connection port 11 and the grease outlet 15 are hermetically connected by a sealing component 16. Similarly, the opening at one end of the oil injection channel 2 and the grease injection channel 1 are also hermetically connected by the sealing component 16 to prevent the leakage of lubricating oil and form a relatively enclosed annulus 17 at the same time. The oil injection port 13 of the oil injection channel 2 is opened on the side wall of the oil injection channel 2. In this embodiment, the axial length of the grease outlet 15 should be as small as possible to prevent the grease from gradually accumulating at the bend of the grease outlet 15, which will increase the maintenance difficulty after excavation, or even scrap the grease injection structure. At the same time, it can also reduce the inner diameter of the oil injection channel 2, so as to reduce the total volume of the annulus 17, reduce the oil injection difficulty and improve the oil injection efficiency. In this embodiment, the grease injection process is the same as that of the above embodiment. During the oil injection process, the lubricating oil enters the one-way valve 3 through the annulus 17 and then enters the grease injection channel 1 to clean the grease. This embodiment integrates the grease injection channel 1 and the oil injection channel 2. On the one hand, it can reduce the assembly work and is easy to disassemble and assemble during maintenance. On the other hand, since the grease itself has a certain viscosity, the material of the grease injection channel 1 is generally selected to be relatively smooth. However, the general grease injection channel 1 is completely exposed to the soil. Due to the moisture and a large number of other acid-base substances in the soil, the grease injection channel 1 is easily corroded in the soil, so the service life of the grease injection channel 1 is extremely limited. After the grease injection channel 1 is sleeved into the oil injection channel 2, the oil injection channel 2 plays a protective role for the grease injection channel 1, reducing the corrosion effect to a certain extent. And after each cleaning of the grease, a large amount of lubricating oil will still remain in the annulus 17, further preventing the grease injection channel 1 from being eroded and protecting the grease injection channel 1, so as to ensure the service life of the grease injection channel 1. Indirectly, due to the socket connection between the grease injection channel 1 and the oil injection channel 2, the material selection of the grease injection channel 1 can choose materials with lower property requirements, thus reducing the manufacturing cost of the grease injection structure.

[0035] In a possible embodiment, the grease injection channel 1 and the oil injection channel 2 are provided as an integrally formed structure. Compared with the above embodiment, the integrally formed structure can reduce problems such as the use, installation, and replacement of the sealing component 16, and there is no safety hazard of leakage, which can ensure the sealing performance.

[0036] In a possible embodiment, the grease outlet 15 and the grease injection channel 1 are provided as a detachable connection. As Figure 2As shown, a fat outlet 15 is threadedly connected with a connection end of the fat outlet 15. The connection end of the fat outlet 15 is communicated with an oil inlet 7 of an underground valve 6 to realize the communication between the oil inlet 7 and the fat outlet 15. During the oil injection process, the probability of the presence of the fat body at the fat outlet 15 is greater than that of the fat body at other places in the fat injection channel 1. That is, the cleaning of the fat body at the fat outlet 15 is relatively likely to have residues. Therefore, the probability of blockage of the fat outlet 15 is relatively high. Disconnectably connecting the fat outlet 15 with the fat injection channel 1 can separately replace and clean the fat outlet 15, reducing the maintenance cost.

[0037] In a possible embodiment, as Figure 3 shown, the fat injection channel 1 is configured with a heating device 8. Configuring the heating device 8 can heat the fat body in the fat injection channel 1, thereby reducing the viscosity of the fat body, facilitating the injection of the fat body, and improving the injection efficiency of the fat body. At the same time, the temperature of the fat body rises to neutralize the underground temperature, preventing the fat body from accelerating hardening due to too low underground temperature, which is beneficial to the cleaning of the fat body by the lubricating oil. The installation position of the heating device 8 should be close to the fat injection port 10 to ensure that all the existing fat bodies in the fat injection channel 1 are heated fat bodies, preventing the increase in the viscosity of the fat body caused by temperature drop.

[0038] In a possible embodiment, the fat injection channel 1 is configured with a vibrator. The vibrator can vibrate the fat body in the fat injection channel 1, reducing the adhesion degree between the fat body and the wall of the fat injection channel 1, and facilitating the injection of the fat body. The installation position of the vibrator can be any position on the fat injection channel 1. For the convenience of maintenance, it is preferably installed close to the fat injection port 10. At the same time, the number of vibrators can be set to multiple so that the fat bodies at different positions in the fat injection channel 1 can obtain a stronger vibration intensity.

[0039] In a possible embodiment, as a preference of the inventor, the vibrator is an ultrasonic vibrator. Using an ultrasonic vibrator can avoid the vibration of the fat injection channel 1 itself, prevent the fat injection channel 1 from becoming loose, and ensure the service life of the fat injection channel 1.

[0040] The specific embodiments described above have further elaborated on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A grease injection structure applicable to buried valves, characterized in that It includes a grease injection channel (1) and an oil injection channel (2); The grease injection channel (1) has a grease injection port (10), a grease outlet (15) and a connection port (11) that are interconnected. The grease outlet (15) is used to communicate with the grease inlet (7) of the buried valve (6); The oil injection channel (2) has an oil outlet (14) and an oil injection port (13). The oil outlet (14) is communicated with the connection port (11) through a check valve (3); Wherein, the grease injection channel (1) is coaxially located inside the oil injection channel (2). An annulus (17) is formed between the grease injection channel (1) and the oil injection channel (2). The connection port (11) is communicated with the annulus (17) through a check valve (3). The grease outlet (15) passes through the wall of the oil injection channel (2) and is located outside the oil injection channel (2).

2. The grease injection structure applicable to the buried valve according to claim 1, wherein, There are at least two grease injection channels (1), and each grease injection channel (1) is respectively communicated with the oil injection channel (2) through a check valve (3).

3. The grease injection structure applicable to the buried valve according to claim 1, characterized in that, The grease injection channel (1) and the oil injection channel (2) are of an integrally formed structure.

4. A grease injection structure applicable to an underground valve according to claim 1, characterized in that, The grease outlet (15) is detachably connected to the grease injection channel (1).

5. The grease injection structure for a buried valve according to claim 1, characterized in that, The grease injection channel (1) is configured with a heating device (8).

6. The grease injection structure applicable to the buried valve according to claim 1, characterized in that, The grease injection channel (1) is configured with a vibrator.

7. The grease injection structure applicable to the buried valve according to claim 6, characterized in that, The vibrator is an ultrasonic vibrator.

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