A kind of unloading valve and adopt the unloading valve of superhigh pressure equipment

Abstract

The application belongs to the field of relief valves of superhigh pressure equipment, and particularly relates to a unloading valve and a superhigh pressure equipment adopting the same, which comprises a valve body composed of an upper valve body, a middle valve body and a lower valve body, a valve seat is arranged in the lower valve body, and the middle valve body is located between the upper valve body and the valve seat; during maintenance, the middle valve body can be horizontally pulled outwards, and after the middle valve body is pulled out, a maintenance cavity is formed between the upper valve body and the lower valve body; the superhigh pressure equipment adopting the unloading valve can quickly replace the valve seat and the valve needle, and the maintenance time is shortened.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of unloading valves of super high pressure equipment, and particularly relates to an unloading valve and a super high pressure equipment adopting the same. BACKGROUND

[0002] The super high pressure equipment refers to an equipment for processing materials by using pressure greater than 100 MPa. The main function of the unloading valve in the super high pressure equipment is to control pressure relief, and the unloading valve is one of the components working most frequently in the super high pressure equipment. The performance of the unloading valve directly affects the reliability, safety, working efficiency and service life of the super high pressure equipment. With the pressure increasing and pressure relief of the super high pressure equipment, the valve needle of the unloading valve needs to frequently open and close with the valve seat. In the process of opening and closing of the unloading valve, the super high pressure will generate a great impact force on the valve needle and the valve seat, and the great impact force will cause erosion of the valve needle and the valve seat, and the valve needle and the valve seat are prone to fatigue damage under high-frequency vibration.

[0003] At present, the unloading valves applied in the super high pressure equipment cannot completely avoid this problem. Therefore, the valve needle and the valve seat of most super high pressure equipment need to be frequently replaced. However, since the valve body of the existing unloading valve is difficult to disassemble, the unloading valve needs to be disconnected from the multiple connections of the equipment and the pipeline system, moved to a workbench, disassembled to take out and replace the valve needle and the valve seat, reassembled, and then installed on the equipment and connected to the multiple pipelines. The long maintenance and replacement time seriously affects the use efficiency of the super high pressure equipment. SUMMARY

[0004] In order to solve the problem of long replacement time of the valve needle and the valve seat in the maintenance process of the existing high pressure unloading valve, the present application provides an unloading valve and a super high pressure equipment adopting the same. The unloading valve has a simple structure, and after the middle valve body is pulled out from between the upper valve body and the lower valve body, the space of the middle valve body serves as a maintenance cavity, so that the valve needle and the valve seat can be quickly replaced, thereby greatly shortening the maintenance time.

[0005] To solve the above technical problems, the technical solution adopted by the present application is as follows: an unloading valve, comprising a valve body composed of an upper valve body, a middle valve body and a lower valve body, the lower valve body is provided with a valve seat, the middle valve body is located between the upper valve body and the valve seat, and the middle valve body can be pulled out horizontally outward during maintenance, and a maintenance cavity is formed between the upper valve body and the lower valve body after the middle valve body is pulled out.

[0006] Further, the valve seat is movably arranged on the lower valve body.

[0007] Further, a sealing structure is arranged between the lower part of the valve seat and the lower valve body.

[0008] Further, the unloading valve further comprises a fixed frame, the upper valve body, the middle valve body and the lower valve body are sequentially arranged in the fixed frame from top to bottom, and the middle valve body is not connected with the upper valve body and the lower valve body.

[0009] Further, the upper valve body is provided with an upper flange seat, the lower valve body is provided with a lower flange seat, and the upper flange seat and the lower flange seat are connected through a screw rod.

[0010] Further, the upper valve body is provided with an upper flange seat, the lower valve body is provided with a lower flange seat, and the upper valve body and the lower valve body are connected through a screw rod.

[0011] Further, the upper valve body, the lower valve body and the fixed frame are connected through threads.

[0012] Further, the valve body is provided with a valve needle connected with an actuator, and after the middle valve body is horizontally pulled out, the valve needle can be disassembled and replaced from the maintenance cavity.

[0013] Further, the upper valve body is provided with a first sealing ring at one end close to the middle valve body, the middle valve body is provided with a second sealing ring and a third sealing ring at the upper end and the lower end respectively, the lower valve body is provided with a fourth sealing ring at one end close to the middle valve body, the outer sides of the first sealing ring and the second sealing ring are provided with a first positioning sleeve, the outer sides of the third sealing ring and the fourth sealing ring are provided with a second positioning sleeve, and the first positioning sleeve and the second positioning sleeve can slide up and down along the outer circumference of the middle valve body.

[0014] Another technical solution protected by the application is: an ultrahigh pressure equipment adopts the high pressure unloading valve of any one of the above as a pressure relief device of the ultrahigh pressure equipment.

[0015] Compared with the prior art, the application has the beneficial effects that: the middle valve body is detachably connected with the upper valve body and the lower valve body, and the stroke position of the valve needle can be lifted to the upper side of the middle valve body. When the middle valve body is horizontally pulled out to form a maintenance cavity, the valve seat and the valve needle can be directly replaced from the maintenance cavity, without the need to disassemble and remove the whole high pressure unloading valve, so that the maintenance time is greatly shortened, and the utilization rate of the whole ultrahigh pressure equipment is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] The application will be further described below with reference to the drawings.

[0017] Figure 1 It is a cross-sectional view of the high pressure unloading valve when the positioning sleeve is in the open state.

[0018] Figure 2 It is a cross-sectional view of the high pressure unloading valve when the positioning sleeve is in the closed state.

[0019] Figure 3This is a schematic diagram of the inspection chamber after the valve body is pulled out.

[0020] Figure 4 for Figure 2 Enlarged view of a portion of point A in the middle.

[0021] Figure 5 for Figure 2 Enlarged view of section B in the middle.

[0022] Figure 6 It is a structural form in which the upper valve body and the lower valve body are connected by a screw.

[0023] Figure 7 It is a structural form in which the middle valve body is connected to the upper valve body and the lower valve body respectively.

[0024] Figure 8 It is a structure in which the upper valve body, lower valve body and fixed frame are threadedly connected.

[0025] Figure 9 A structural form in which a retaining ring is used to fix the frame.

[0026] In the diagram, 1 is the upper valve body, 2 is the middle valve body, 3 is the lower valve body, 4 is the valve seat, 5 is the inspection chamber, 6 is the fixed frame, 7 is the upper flange seat, 8 is the lower flange seat, 9 is the screw, 10 is the upper flange, 11 is the lower flange, 12 is the middle flange, 13 is the actuator, 14 is the valve needle, 15 is the first sealing ring, 16 is the second sealing ring, 17 is the third sealing ring, 18 is the fourth sealing ring, 19 is the first positioning sleeve, 20 is the second positioning sleeve, 21 is the unloading port, 22 is the sealing structure, and 23 is the retaining ring. Detailed Implementation

[0027] like Figures 1-9 As shown, an unloading valve includes an upper valve body 1, a middle valve body 2, and a lower valve body 3. The middle of the middle valve body 2 and the lower valve body 3 forms a through unloading channel. An unloading port 21 is provided on the outer side of the middle valve body 2, and the unloading port 21 is connected to the unloading channel. A valve seat 4 is provided inside the lower valve body 3, and a valve needle 14 is provided inside the unloading channel of the middle valve body 2. The upper part of the valve needle 14 is connected to an actuator 13, and it can move up and down under the drive of the actuator 13, thereby completing the opening and closing actions of the valve needle 14 and the lower valve body 3.

[0028] Replacing the valve seat 4 and valve needle 14 of the existing high-pressure unloading valve is very complicated. It requires disconnecting the unloading valve from multiple points on the equipment and the pipeline system, moving it to a workbench, and disassembling the unloading valve body before the valve needle and valve seat can be removed and replaced. However, for ultra-high pressure equipment, the maintenance and replacement time is too long, which will seriously affect the efficiency of the ultra-high pressure equipment.

[0029] In order to improve the replacement efficiency of the valve seat 4 and the valve needle 14, the middle valve body 2 is arranged between the upper valve body 1 and the valve seat 4, when the maintenance is needed, the middle valve body 2 can be pulled out horizontally and outwardly, and after the middle valve body 2 is pulled out, the maintenance cavity 5 is formed between the upper valve body 1 and the lower valve body 3.

[0030] When the valve seat 4 needs to be replaced, first, the control actuator 13 is controlled to drive the valve needle 14 to move to the upper part of the middle valve body 2, so that the valve needle 14 does not interfere with the movement of the middle valve body 2. If the middle valve body 2 is connected with the upper valve body 1 and the lower valve body 3, the connection is first disconnected, and then the middle valve body 2 can be pulled out horizontally and outwardly to form the maintenance cavity 5. The maintenance personnel can replace the valve seat 4 and the valve needle 14 from the maintenance cavity 5. When the valve needle 14 is replaced, the control actuator 13 is controlled to drive the valve needle 14 to move downwardly, so that the valve needle 14 is completely exposed in the maintenance cavity 5 for replacement. In this way, the unloading valve does not need to be disassembled as a whole, and the replacement efficiency is greatly improved.

[0031] In the above embodiment, the connection relationship between the valve seat 4 and the lower valve body 3 is not limited, and at present, the common method is that the valve seat 4 and the lower valve body 3 are fixedly connected, and this connection mode causes that when the valve seat 4 is replaced, the fixed connection between the valve seat 4 and the lower valve body 3 needs to be disconnected. In order to further improve the replacement speed of the valve seat 4, in this embodiment, the valve seat 4 and the lower valve body 3 are movably arranged.

[0032] A placing groove matched with the shape of the valve seat 4 is arranged in the middle part of the lower valve body 3, and the valve seat 4 is movably arranged in the placing groove. When the unloading valve works, the pressure in the unloading channel presses the upper surface of the valve seat 4 on the lower surface of the middle valve body 2 to make the two surfaces tightly contact, the middle valve body 2 limits the displacement of the valve seat 4 to ensure that the valve seat 4 and the lower valve body 3 are reliably sealed, and the thrust of the valve seat 4 is transmitted to the upper valve body 1 through the middle valve body 2 and is transmitted to the fixed structure by the upper valve body 1. The fixed structure can be the fixing between the upper valve body 1 and the lower valve body 3, or the fixing between the middle valve body 2 and the upper valve body 1 and the lower valve body 3 respectively. The form of the fixed structure will be described in detail in subsequent embodiments.

[0033] In addition, a sealing structure 22 is arranged between the lower part of the valve seat 4 and the lower valve body 3 to seal, and the valve seat 4 and the lower valve body 3 always maintain a sealed state.

[0034] On the basis of the above embodiment, in this embodiment, the connection forms among the upper valve body 1, the middle valve body 2 and the lower valve body 3 are mainly introduced.

[0035] The first form is as follows: Figure 1As shown, the upper valve body 1, the middle valve body 2 and the lower valve body 3 are sequentially arranged in the fixed frame 6 from top to bottom, the position of the upper valve body 1, the middle valve body 2 and the lower valve body 3 is limited by the fixed frame 6, and the fixed frame 6 can be fixed by the retainer 23. In this structure, the middle valve body 2 is not connected with the upper valve body 1 and the lower valve body 3.

[0036] When the valve seat 4 is subjected to the pressure of the unloading channel, the thrust on the valve seat 4 is transmitted to the upper valve body 1 through the middle valve body 2, the upper valve body 1 transmits the thrust to the fixed frame 6 in contact with the upper valve body 1, and the fixed frame 6 bears the overall system thrust. The connection between the upper valve body 1, the lower valve body 3 and the fixed frame 6 can adopt various forms, the upper valve body 1 can be directly inserted into the mounting hole at the top of the fixed frame 6 and then clamped, as shown in Figure 8 The upper valve body 1 can also be threadedly connected with the fixed frame 6, or the upper valve body 1 and the fixed frame 6 can be integrally arranged.

[0037] The second form is shown in Figure 6 The upper valve body 1 is provided with an upper flange seat 7 on the outer side, the lower valve body 3 is provided with a lower flange seat 8 on the outer side, and the upper and lower ends of the middle valve body 2 are provided with middle flange seats, respectively connected with the upper flange seat 7 and the lower flange seat 8.

[0038] The third form is shown in Figure 7 The upper valve body 1 is provided with an upper flange seat 7 on the outer side, the lower valve body 3 is provided with a lower flange seat 8 on the outer side, and the upper and lower ends of the middle valve body 2 are provided with middle flange seats, respectively connected with the upper flange seat 7 and the lower flange seat 8.

[0039] This structure connects the middle valve body 2 with the upper valve body 1 and the lower valve body 3 respectively, and when maintenance is needed, the connection structure of the middle valve body 2 with the upper valve body 1 and the lower valve body 3 needs to be removed, and then the middle valve body 2 can be pulled out to form the maintenance cavity 5. In the first form and the second form, the middle valve body 2 is not connected with the upper valve body 1 and the lower valve body 3, and when maintenance is needed, the middle valve body 2 can be directly pulled out to form the maintenance cavity 5.

[0040] The above forms can realize the connection between the upper valve body 1, the middle valve body 2 and the lower valve body 3, but are not limited to these forms. As long as the structure can bear the great thrust in the high-pressure unloading process and the middle valve body 2 can be easily pulled out during maintenance, it is acceptable. The first form is preferred in the present application. In this form, the middle valve body 2 can be quickly pulled out during maintenance, greatly shortening the maintenance time.

[0041] The connection forms of the middle valve body 2, the upper valve body 1 and the lower valve body 3 are mainly introduced in the above embodiments. In order to facilitate the maintenance, the middle valve body 2 can be pulled out, and the sealing structure 22 cannot be arranged on the contact surface between the middle valve body 2 and the upper valve body 1 and the lower valve body 3. However, in the actual use process, the medium will seep out at the contact surface between the middle valve body 2 and the upper valve body 1 and the lower valve body 3. Considering the above situation, the sealing structure 22 between the middle valve body 2 and the upper valve body 1 and the lower valve body 3 is arranged on the outer side, and the specific structure is as follows:

[0042] The first sealing ring 15 is arranged at one end of the upper valve body 1 close to the middle valve body 2, the second sealing ring 16 and the third sealing ring 17 are respectively arranged at the upper end and the lower end of the middle valve body 2, and the fourth sealing ring 18 is arranged at one end of the lower valve body 3 close to the middle valve body 2. The outer side of the first sealing ring 15 and the second sealing ring 16 is provided with the first positioning sleeve 19, and the outer side of the third sealing ring 17 and the fourth sealing ring 18 is provided with the second positioning sleeve 20. The first positioning sleeve 19 and the second positioning sleeve 20 can slide up and down along the outer circumference of the middle valve body 2.

[0043] As shown in Figures 4-5 , the first positioning sleeve 19 and the second positioning sleeve 20 are in a closed state, the first positioning sleeve 19 encloses the first sealing ring 15 and the second sealing ring 16 on the inner side, and the second positioning sleeve 20 encloses the third sealing ring 17 and the fourth sealing ring 18 on the inner side. The sealing form of this structure will not affect the outward pulling of the middle valve body 2. As shown in Figure 1 , when the middle valve body 2 needs to be pulled out, the first positioning sleeve 19 and the second positioning sleeve 20 are first slid to an open state, so that the first positioning sleeve 19 and the second positioning sleeve 20 will not limit the movement of the middle valve body 2. The middle valve body 2 can be directly pulled out, and the disassembly is very convenient.

[0044] The main function of the first positioning sleeve 19 and the second positioning sleeve 20 is to fix the first sealing ring 15, the second sealing ring 16, the third sealing ring 17 and the fourth sealing ring 18. When the first positioning sleeve 19 and the second positioning sleeve are in a closed state, they can also play a certain limiting role, which can limit the transverse movement between the middle valve body 2 and the upper valve body 1 and the lower valve body 3 to a certain extent.

[0045] The actuator 13 in the above several embodiments can adopt a pneumatic driving mechanism, or a hydraulic driving mechanism, or a mechanical driving mechanism. In the present application, the hydraulic driving mechanism is preferred.

[0046] The unloading valve of the present application is mainly applied to super-high pressure equipment, and therefore another technical solution protected by the present application is super-high pressure equipment: comprising a high-pressure cavity for processing materials, and an unloading valve arranged on the outer side of the high-pressure cavity. The unloading valve adopts any high-pressure unloading valve described above, and the pressure relief action of the high-pressure cavity is completed by using the high-pressure unloading valve.

[0047] After using the high-pressure unloading valve of the present application on the super-high pressure equipment, the maintenance and replacement time of the valve needle 14 and the lower valve seat 4 can be greatly shortened, thereby improving the utilization efficiency of the entire super-high pressure equipment.

[0048] In the description of the present application, "super-high pressure" refers to a pressure greater than or equal to 100 MPa, for example, up to 1000 MPa. Preferably, the pressure of the super-high pressure is greater than or equal to 300 MPa, and the more preferred range is 400 MPa-900 MPa, for example, the pressure of the super-high pressure can be 300 MPa, 400 MPa, 600 MPa, 900 MPa, etc.

[0049] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above-described embodiments, and various changes can be made within the knowledge possessed by those skilled in the art without departing from the spirit of the present application.

Claims

1. An unloading valve comprising a valve body composed of an upper valve body (1), a middle valve body (2) and a lower valve body (3), a valve seat (4) being provided in the lower valve body (3), characterized in that: The middle valve body (2) is located between the upper valve body (1) and the valve seat (4), and during maintenance, the middle valve body (2) can be horizontally pulled outwards, and after the middle valve body (2) is pulled out, a maintenance cavity (5) is formed between the upper valve body (1) and the lower valve body (3); The outer side of one end of the upper valve body (1) near the middle valve body (2) is provided with a first sealing ring (15), the outer sides of the upper and lower ends of the middle valve body (2) are respectively provided with a second sealing ring (16) and a third sealing ring (17), and the outer side of one end of the lower valve body (3) near the middle valve body (2) is provided with a fourth sealing ring (18), the outer sides of the first sealing ring (15) and the second sealing ring (16) are provided with a first positioning sleeve (19), the outer sides of the third sealing ring (17) and the fourth sealing ring (18) are provided with a second positioning sleeve (20), and the first positioning sleeve (19) and the second positioning sleeve (20) can slide up and down along the outer circumference of the middle valve body (2).

2. An unloader valve according to claim 1, characterised in that: The valve seat (4) is movably arranged on the lower valve body (3).

3. An unloader valve according to claim 2, characterised in that: A sealing structure (22) is arranged between the lower part of the valve seat (4) and the lower valve body (3).

4. A unloader valve according to claim 1, characterized in that: Further comprising a fixed frame (6), the upper valve body (1), the middle valve body (2) and the lower valve body (3) are sequentially arranged in the fixed frame (6) from top to bottom, and the middle valve body (2) is not connected between the upper valve body (1) and the lower valve body (3).

5. A unloader valve according to claim 1, characterized in that: An upper flange seat (7) is arranged on the outer side of the upper valve body (1), a lower flange seat (8) is arranged on the outer side of the lower valve body (3), and the upper flange seat (7) and the lower flange seat (8) are connected through a screw rod (9).

6. An unloader valve according to claim 1 wherein: An upper flange plate (10) is arranged on the outer side of the upper valve body (1), a lower flange plate (11) is arranged on the outer side of the lower valve body (3), and middle flange plates (12) are arranged on the upper and lower ends of the middle valve body (2), and the middle flange plates (12) on the upper and lower ends are connected with the upper flange plate (10) and the lower flange plate (11) respectively.

7. A unloader valve according to claim 4, wherein: The upper valve body (1) and the lower valve body (3) are threadedly connected with the fixed frame (6).

8. A unloader valve according to claim 1, characterized in that: A valve needle (14) connected with an actuator (13) is arranged in the valve body, and after the middle valve body (2) is horizontally pulled out, the valve needle (14) can be disassembled and replaced from the maintenance cavity (5).

9. An ultra-high pressure apparatus characterized by: The unloading valve of any one of claims 1-8 is used as a pressure relief device of an ultrahigh pressure device. The unloading valve of any one of claims 1-8 is used as a pressure relief device of an ultrahigh pressure device.

Images