Grease injection switching device with pressure relief function

Abstract

The utility model discloses a grease injection switching device with a pressure relief function. The grease injection switching device comprises an adapter, a circulation channel is formed in the adapter, and the circulation channel is provided with a switching inlet suitable for being communicated with a grease storage tank and a switching outlet communicated with a grease injection gun; the adapter is provided with a first pressure relief opening and a second pressure relief opening which are communicated with the circulation channel. A pressure relief valve is arranged at the first pressure relief opening; a rupture disk is arranged at the second pressure relief opening; the bursting pressure of the bursting piece is larger than the relief pressure of the pressure relief valve. In the embodiment, in the grease injection process, when the grease injection pressure exceeds the preset pressure, the pressure relief valve is opened to conduct first-stage pressure relief; after the pressure release valve is blocked by the sealing grease and fails, when the pressure in the pipeline continues to rise to reach the bursting pressure of the bursting piece, the bursting piece is broken to achieve secondary pressure release, and pressure release is safer and more reliable.

Description

Technical Field

[0001] This utility model relates to the technical field of grease injection sealing devices, and in particular to a grease injection adapter with a pressure relief function. Background Technology

[0002] In the field of natural gas extraction, high-pressure equipment such as gas production trees, manifolds, and flat valves are typically involved, and these high-pressure equipment has stringent sealing requirements. However, the sealing surface between the valve plate and seat of valves on high-pressure equipment is a moving sealing surface. If only a hard metal sealing surface is used, a proper seal cannot be achieved. Therefore, to improve the sealing effect of the valve in the closed state, it is necessary to inject sealing grease into the sealing surface.

[0003] In existing technology, grease injection equipment generally includes a grease reservoir containing grease and a grease injection gun connected to the reservoir. When the grease pressure is too high, it will damage the internal components of the grease injection gun.

[0004] Therefore, pressure relief components are needed to release pressure. Furthermore, the high viscosity of the sealing grease can easily clog the pressure relief components, causing them to fail. Utility Model Content

[0005] This invention provides a grease injection adapter with pressure relief function to solve the technical problem that existing grease injection equipment cannot achieve pressure relief.

[0006] This utility model provides a grease injection adapter with a pressure relief function. The grease injection adapter includes an adapter with an internal flow channel. The flow channel has an adapter inlet suitable for communication with a grease tank and an adapter outlet suitable for communication with a grease injection gun.

[0007] The adapter is provided with a first pressure relief port and a second pressure relief port that are respectively connected to the flow channel; wherein, a pressure relief valve is provided at the first pressure relief port; and a rupture disc is provided at the second pressure relief port;

[0008] The rupture disc is configured such that its burst pressure is greater than the release pressure of the pressure relief valve.

[0009] In one implementation, the central region of the rupture disc is a raised, arched shape, with the direction of the arch protrusion being the rupture direction.

[0010] In one implementation, a crack groove is provided in the middle of the upper outer side wall of the arch, and the crack groove is radiating.

[0011] In one embodiment, the thickness of the rupture disc is 0.4 mm to 0.7 mm, and the depth of the planar notch in the crack groove is 0.05 mm to 0.15 mm.

[0012] In one embodiment, damping grooves are provided on the inner and outer edges of the rupture disc;

[0013] Damping rings are provided one-to-one in the damping groove.

[0014] In one embodiment, the bursting pressure of the rupture disc is 1.2 to 1.5 times the pressure released by the pressure relief valve.

[0015] As one implementation, a bypass pipe is also included, which is connected to the second pressure relief port on the adapter, and the rupture disc is sealed and installed on the rupture end of the bypass pipe.

[0016] In one embodiment, the bypass pipe is a three-way pipe, and a pressure gauge is also provided on the third port of the bypass pipe for measuring the pressure in the flow channel.

[0017] In one embodiment, the rupture end of the bypass pipe is connected to an overflow pipe, and the rupture disc is sealed between the rupture end of the bypass pipe and the inlet end of the overflow pipe.

[0018] The outlet end of the overflow pipe is connected to the recovery device.

[0019] In one implementation, the outlet end of the pressure relief valve is connected to the overflow pipe.

[0020] Compared with the prior art, the advantages of this utility model are:

[0021] The grease injection adapter in this embodiment is used in the grease injection and sealing process of high-pressure equipment such as gas source trees, manifolds, and flat valves. The basic principle of the grease injection adapter is as follows:

[0022] First, connect the adapter inlet end to the grease reservoir outlet end using the first connecting hose, and then connect the adapter outlet end to the grease gun inlet end.

[0023] Then, during the grease injection process, the sealing grease in the grease tank flows outward under pump pressure and is delivered through the first connecting hose to the flow channel of adapter 1. From the adapter outlet, it enters the grease injection gun, which then injects the sealing grease into the sealing surfaces of the high-pressure equipment. Therefore, this method is suitable for grease injection applications in high-pressure equipment such as gas source trees, manifolds, and flat valves.

[0024] During the grease injection process, the grease injection pressure is controlled within the range of 10-50MPa. When the grease injection pressure exceeds the preset pressure (50MPa), the pressure relief valve 2 is opened, and the grease in the flow channel can flow out through the first pressure relief port and the pressure relief valve to perform first-stage pressure relief.

[0025] After the pressure relief valve 2 is blocked by sealing grease, the sealing grease in the flow channel cannot be released through the pressure relief valve. If the pressure in the flow channel continues to rise and reaches the burst pressure of the rupture disc 4 (for example, 60 MPa), the rupture disc 4 will rupture. At this time, the sealing grease in the flow channel can flow out through the second pressure relief port and the rupture opening formed on the rupture disc to achieve secondary pressure relief.

[0026] Therefore, the grease injection adapter in this embodiment can achieve two-stage pressure relief. Even if the pressure relief valve is blocked, pressure relief can be achieved by bursting the rupture disc, which is safer and more reliable. Attached Figure Description

[0027] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0028] Figure 1 This is a schematic diagram of the grease injection adapter.

[0029] Figure 2 This is a schematic diagram of the structure of a rupture disc;

[0030] Figure 3 This is a front view of the crack grooves on the rupture disc before it explodes;

[0031] Figure 4 This is a diagram showing the effect of rupture fragments after an explosion.

[0032] Figure 5 This is a schematic diagram of a spring-loaded safety valve for pressure relief.

[0033] Figure label:

[0034] 1. Adapter; 101. Flow channel; 11. Adapter inlet; 12. Adapter outlet; 13. First pressure relief port; 14. Second pressure relief port;

[0035] 2. Pressure relief valve; 21. Valve cover; 22. Spring; 23. Valve stem; 231. Annular groove; 24. Valve gasket; 25. Valve body; 251. First through hole; 252. Second through hole; 253. Annular protrusion;

[0036] 3. Rupture disc; 31. Crack groove; 32. Damping groove; 33. Damping ring; 34. Rupture opening;

[0037] 4. Bypass pipe; 5. Pressure gauge; 6. Overflow pipe;

[0038] 71. First flange; 72. Second flange;

[0039] 81. First pipe connector; 82. Second pipe connector. Detailed Implementation

[0040] The present invention will be further described below with reference to the accompanying drawings.

[0041] The grease tank is used to store sealing grease. The sealing grease can be a high-temperature resistant silicone-based grease (resistant to 260℃). Silicone-based sealing grease is mainly composed of thickened synthetic oil, inorganic thickeners, additives, and structure improvers. In particular, nano-modified silicone oil is used as a thickener, exhibiting excellent thermal stability, material compatibility, chemical stability, corrosion resistance, and lubricity. High-temperature resistant silicone-based sealing grease is not only non-corrosive to metals but also has good compatibility with most rubbers and strong adhesion to both metals and rubber, thus enabling effective sealing of sealing surfaces in high-pressure equipment.

[0042] This utility model embodiment provides a grease injection adapter with pressure relief function, such as Figure 1 As shown, the grease injection adapter includes an adapter 1 installed between the grease injection gun and the grease reservoir, a pressure relief valve 2 installed on the adapter 1, and a rupture disc 3.

[0043] The adapter 1 has a flow channel 101, which has an adapter inlet 11 suitable for communication with a grease reservoir and an adapter outlet 12 suitable for communication with a grease gun. The adapter inlet 11 on the adapter 1 is connected to the grease reservoir containing sealing grease, and the adapter outlet 12 is connected to the grease gun.

[0044] The adapter 1 is also provided with a first pressure relief port 13 and a second pressure relief port 14 that are respectively connected to the flow channel 101; a pressure relief valve 2 is connected to the first pressure relief port 13 on the adapter 1.

[0045] A rupture disc 3 is installed at the second pressure relief port 14 on the adapter 1. The rupture disc 3 is configured such that its burst pressure is greater than the release pressure of the pressure relief valve 2.

[0046] The burst pressure of the rupture disc 3 can be set to 1.2 to 1.5 times the pressure released by the pressure relief valve 2.

[0047] The grease injection adapter in this embodiment is used in the grease injection and sealing process of high-pressure equipment such as gas source trees, manifolds, and flat valves. The basic principle of the grease injection adapter is as follows:

[0048] First, connect the adapter inlet 11 end of the adapter 1 to the outlet end of the grease reservoir using the first connecting hose, and connect the adapter outlet 12 end of the adapter 1 to the inlet end of the grease gun.

[0049] Then, during the grease injection process, the sealing grease in the grease tank flows outward under the action of pump pressure and is delivered to the flow channel 101 of the adapter 1 through the first connecting hose. It then enters the grease injection gun through the adapter outlet 12 and is injected into the sealing parts of the high-pressure equipment. Therefore, it is applicable to grease injection applications for sealing parts of high-pressure equipment such as gas source trees, manifolds, and flat valves.

[0050] During the grease injection process, the grease injection pressure is controlled within the range of 10-50MPa. When the grease injection pressure exceeds the preset pressure (50MPa), the pressure relief valve 2 is opened, and the grease in the flow channel 101 can flow out through the first pressure relief port 13 and the pressure relief valve 2 to perform first-stage pressure relief.

[0051] After the pressure relief valve 2 is blocked by sealing grease, the sealing grease in the flow channel 101 cannot be released through the pressure relief valve 2. If the pressure in the flow channel 101 continues to rise and reaches the burst pressure of the rupture disc 3 (for example, 60 MPa), the rupture disc 3 will rupture. At this time, the sealing grease in the flow channel 101 can flow out through the second pressure relief port 14 and the rupture opening 34 formed on the rupture disc 3 to achieve secondary pressure relief.

[0052] Therefore, the grease injection adapter in this embodiment can achieve two-stage pressure relief. Even if the pressure relief valve 2 is blocked, pressure relief can be achieved by the bursting disc 3, which is safer and more reliable.

[0053] In this embodiment, the adapter 1 is connected to the grease tank via a flexible connecting pipe. The specific connection method is as follows: a connecting hose is provided at the outlet of the grease tank. A first pipe connector 81 is provided on one end of the connecting hose used to connect to the adapter 1. The first pipe connector 81 is screwed into the adapter 1 through the adapter inlet 11 and threadedly connected to the adapter 1.

[0054] The specific installation method of adapter 1 and grease gun is as follows: a second pipe connector 82 is threadedly connected to the adapter outlet 12 on adapter 1, and adapter 1 is fixedly installed on the inlet end of grease gun through the second pipe connector 82.

[0055] The adapter 1 can be a four-way connector, with internal threads for threaded connection provided on the inner walls of the four through holes on the four-way connector. The inner diameter of the flow channel 101 on the adapter 1 is Φ10mm, and the inner wall of the flow channel 101 is polished with a surface roughness Ra≤0.8μm, which can reduce resistance and improve grease injection efficiency.

[0056] The grease injection adapter in this embodiment also includes a bypass pipe 4, which is connected to the second pressure relief port 14 on the adapter 1, and the rupture disc 3 is sealed and installed on the rupture end of the bypass pipe 4.

[0057] In order to measure and monitor the pressure inside the pipe, a pressure gauge 5 is also installed on the bypass pipe 4 to measure the pressure inside the flow channel 101.

[0058] In this embodiment, the adapter 1 is fixedly installed with the grease gun, and the pressure gauge 5 is set close to the adapter 1. Therefore, during the grease injection process, the operator can easily observe the pressure value of the pressure gauge 5 so that the pressure relief valve 2 can be opened in time to relieve pressure when the pressure is higher than the preset value.

[0059] Specifically, the bypass pipe 4 is a three-way pipe, with its first end connected to the second pressure relief port 14 on the adapter 1; the rupture disc 3 is sealed at the second end of the bypass pipe 4, i.e. the rupture end; and the pressure gauge 5 is located at the third port of the bypass pipe 4.

[0060] In order to recover the released sealing grease during the pressure relief process, an overflow pipe 6 is also provided in this embodiment. The first inlet end of the overflow pipe 6 is connected to the burst end of the bypass pipe 4, and the bursting disc 3 is sealed between the burst end of the bypass pipe 4 and the inlet end of the overflow pipe 6. The second inlet end of the overflow pipe 6 is connected to the outlet end of the pressure relief valve 2. The outlet end of the overflow pipe 6 is connected to the recovery device.

[0061] During the first-stage pressure relief process of opening the pressure relief valve 2, the sealing grease flowing out through the pressure relief valve 2 can flow into the overflow pipe 6 and be discharged into the recovery device through the overflow pipe 6, thereby recovering the sealing grease.

[0062] When the pressure relief valve 2 becomes blocked and the rupture disc 3 performs secondary pressure relief, the sealing grease discharged through the outlet of the bypass pipe 4 can flow through the overflow pipe 6 and be discharged into the recovery device, thereby recovering the sealing grease.

[0063] The following is an explanation of pulverized fragment 3, such as... Figures 1 to 4 As shown. Figure 1 This is a schematic diagram of the grease injection adapter. Figure 2 This is a schematic diagram of the structure of rupture disc 3; Figure 3 This is a front view of the crack groove 31 on the rupture disc 3 before it explodes; Figure 4 This is a schematic diagram of blasting fragment 3 after the explosion.

[0064] In this embodiment, the rupture disc 3 is made of a metallic material, which can be a nickel-based alloy.

[0065] The central area of ​​the rupture disc 3 is a raised arch, the height of which is 1 / 5 to 1 / 6 of the maximum diameter of the arch. The direction of the arch's protrusion is the direction of rupture.

[0066] A crack groove 31 is provided in the middle of the outer side of the arch. The crack groove 31 is radiating and can be opened by a "+" groove or "M" groove. The cross-sectional shape of the crack groove 31 is rectangular or "V" shaped, so that the diaphragm is more likely to be intact after rupture.

[0067] The thickness of the rupture disc 3 is 0.4mm to 0.7mm, and the preferred thickness of the rupture disc 3 is 0.5mm; the depth of the planar notch of the crack groove 31 is 0.05mm to 0.15mm, and the preferred notch depth is 0.1mm.

[0068] The inner and outer edges of the rupture disc 3 are respectively provided with damping grooves 32, and damping rings 33 are installed in the damping grooves 32. The width of the damping rings 33 corresponds to that of the damping grooves 32, and they are fixedly connected in the damping grooves 32.

[0069] The installation principle of the rupture disc 3 is as follows: A first flange 71 is provided at the rupture end of the bypass pipe 4, and a second flange 72 is provided at one end of the overflow pipe 6. The rupture disc 3 is clamped and fixed between the first flange 71 and the second flange 72, with the arched protrusion on the rupture disc 3 facing the overflow pipe 6. After the two flanges are clamped and fixed, the damping ring 33 located inside the rupture disc 3 can cooperate to abut against the end face of the first flange 71, and the damping ring 33 located outside the rupture disc 3 can cooperate to abut against the end face of the second flange 72. This reduces the vibration of the rupture disc 3 during the explosion process, making the rupture effect more stable and the cracking more regular.

[0070] The rupture disc 3 in this embodiment has the following rupture principle:

[0071] The rupture disc 3 is fixed to the rupture end of the bypass pipe 4, causing the arched shape on the rupture disc 3 to bulge away from the bypass pipe 4. When the pressure relief valve 2 is blocked by sealing grease, and the pressure in the flow channel 101 reaches the rupture pressure of the rupture disc 3, the sealing grease in the flow channel 101 explodes and flows out along the arched direction, causing the crack groove 31 in the central area of ​​the rupture disc 3 to crack outward. Thus, before the explosion, the rupture disc 3 can withstand a large pressure (arched part) before cracking outward along the scattering crack groove 31. At the same time, during the explosion, it can crack outward along the scattering crack groove 31, maintaining the integrity of the rupture disc 3 after the explosion, avoiding excessive noise and fragmentation during the explosion, thus making it safer and more reliable.

[0072] In this embodiment, the pressure relief valve 2 can be a manual ball valve or a spring-loaded safety valve 22.

[0073] In one implementation, the pressure relief valve 2 is a spring-loaded safety valve, such as... Figure 1 and Figure 5 As shown.

[0074] The spring-loaded safety valve mainly includes a valve cover 21, a spring 22, a valve stem 23, a valve gasket 24, and a valve body 25.

[0075] The lower end of the valve body 25 is provided with a first through hole 251, and the side wall of the valve body 25 is provided with a second through hole 252. The valve cover 21 is fixed inside the valve body 25 by threads, and a spring 22 is provided between the valve cover 21 and the valve stem 23. One end of the spring 22 elastically abuts against the valve cover 21, and the other end acts on the valve stem 23 and applies downward pressure to the valve stem 23. A valve gasket 24 is provided at the lower end of the valve stem 23, and the valve gasket 24 is used to block the first through hole 251.

[0076] The lower end of the valve stem 23 is provided with an annular groove 231, the valve pad 24 is disposed in the annular groove 231, and the upper edge of the first through hole 251 is provided with an annular protrusion 253, which is used to abut against the valve pad 24 to seal and close the first through hole 251.

[0077] The operating principle is as follows: The spring-loaded safety valve 22 is installed on the first pressure relief port 13 of the adapter 1 through the first through hole 251. The valve cover 21 is rotated to compress the spring 22 downwards to set the pressure relief value (e.g., 50 MPa). When the pressure in the flow channel 101 on the adapter 1 does not reach the set pressure relief value, the valve gasket 24 and the annular protrusion 253 form a sealed structure under the action of the spring 22 and atmospheric pressure to prevent pressure leakage. When the pressure exceeds the set pressure relief value, the pressure in the equipment or pipeline exceeds the sum of atmospheric pressure and the pressure of the spring 22. The pressure enters the pressure relief valve 2 through the first through hole 251 and is then discharged through the second through hole 252.

[0078] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A grease injection adapter with pressure relief function, characterized in that, It includes an adapter with an internal flow channel having an adapter inlet suitable for communication with a grease reservoir and an adapter outlet suitable for communication with a grease gun. The adapter is provided with a first pressure relief port and a second pressure relief port that are respectively connected to the flow channel; wherein, a pressure relief valve is provided at the first pressure relief port; and a rupture disc is provided at the second pressure relief port; The rupture disc is configured such that its burst pressure is greater than the release pressure of the pressure relief valve.

2. The grease injection adapter with pressure relief function according to claim 1, characterized in that, The central area of ​​the rupture disc is a raised, arched shape, and the direction of the arched shape is the direction of rupture.

3. The grease injection adapter with pressure relief function according to claim 2, characterized in that, A crack groove is provided in the middle of the outer side wall of the arch, and the crack groove is radiating.

4. The grease injection adapter with pressure relief function according to claim 2 or 3, characterized in that, The thickness of the rupture disc is 0.4mm to 0.7mm, and the depth of the planar groove is 0.05mm to 0.15mm.

5. The grease injection adapter with pressure relief function according to any one of claims 1-3, characterized in that, The inner and outer edges of the rupture disc are respectively provided with damping grooves; Damping rings are provided one-to-one in the damping groove.

6. The grease injection adapter with pressure relief function according to any one of claims 1-3, characterized in that, The bursting pressure of the rupture disc is 1.2 to 1.5 times the pressure released by the pressure relief valve.

7. The grease injection adapter with pressure relief function according to claim 6, characterized in that, It also includes a bypass pipe, which is connected to the second pressure relief port on the adapter, and the rupture disc is sealed and installed on the rupture end of the bypass pipe.

8. The grease injection adapter with pressure relief function according to claim 7, characterized in that, The bypass pipe is a three-way pipe, and a pressure gauge is also installed on the third port of the bypass pipe to measure the pressure in the flow channel.

9. The grease injection adapter with pressure relief function according to claim 7 or 8, characterized in that, The rupture end of the bypass pipe is connected to an overflow pipe, and the rupture disc is sealed between the rupture end of the bypass pipe and the inlet end of the overflow pipe. The outlet end of the overflow pipe is connected to the recovery device.

10. The grease injection adapter with pressure relief function according to claim 9, characterized in that, The outlet end of the pressure relief valve is connected to the overflow pipe.

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