Low-pressure actuator

Abstract

The utility model relates to the technical field of low-pressure actuators, in particular to a low-pressure actuator which comprises an installation frame and an air cylinder, a nitrogen cylinder is installed on one side of the installation frame, an energy accumulator is installed in the middle of the rear end of the installation frame, and a protection box is installed on the upper portion of the front end of the installation frame. A low-pressure pilot valve and a high-pressure pilot valve are installed on one side of the inner wall of the protection box, a one-way valve is installed on the top of the inner wall of the protection box, the bottom of the low-pressure pilot valve is communicated with an insulation filter through a pipeline, and the insulation filter is communicated with a first three-way valve through a pipeline. According to the improved low-pressure actuator, through the manual reset function, it can be ensured that fluid supply is rapidly cut off by a valve under the emergency situation, fluid leakage and accidents are effectively prevented, and the safety of a system is guaranteed; through a partial stroke test function, the valve is enabled to perform slight action regularly, so that the valve can be ensured to respond normally when needed.

Description

TECHNICAL FIELD

[0001] The utility model relates to low pressure executor technical field, concretely is a low pressure executor. BACKGROUND

[0002] Low pressure executor usually refers to the automation execution part for controlling the equipment in low pressure system, they are common in many industrial applications, building management, HVAC (heating ventilation air conditioning) system etc. fields, and the main role of low pressure executor is receiving the control signal sent from control system (such as PLC, DCS or other automation control system), and adjusting or operating low pressure equipment (such as valve, fan, switch etc.) according to these signals, and the working principle of low pressure executor is usually through power drive, pneumatic or hydraulic energy to execute corresponding action. They are usually used with sensor and control device, form complete automation control system, can realize automatic regulation, switch control etc.

[0003] The inventor finds that the prior art has the following problems in the process of realizing the utility model: 1, when the existing ordinary low pressure executor is used, fluid leakage and accidents cannot be effectively and quickly handled, and the safety is low;2, in the existing ordinary low pressure executor, emergency shut-off valve ESD and emergency vent valve ESV etc. valves, these valves may have the problems of mechanical part sticking or jamming under the condition of long time inactivity. UTILITY MODEL CONTENT

[0004] The utility model discloses a low pressure executor to solve the problems in the prior art. To achieve the above object, the utility model provides the following technical scheme: a low pressure executor, including mounting frame and cylinder, the side of mounting frame is installed nitrogen cylinder, the rear end middle part of mounting frame is installed energy accumulator, the front end upper portion of mounting frame is installed protection box, the inner wall one side of protection box is installed low pressure pilot valve and high pressure pilot valve, the inner wall top of protection box is installed check valve, the bottom of low pressure pilot valve is connected with insulation filter through pipeline, insulation filter is connected with first three-way valve through pipeline, first three-way valve is connected with pneumatic control valve through pipeline, the bottom of pneumatic control valve is connected with second three-way valve through pipeline, the rear end lower part of mounting frame is installed oil tank, the lower part of the inner wall of mounting frame is installed hydraulic valve block group, one side of hydraulic valve block group is connected with first ball valve through pipeline, the outer wall bottom of high pressure pilot valve is connected with second ball valve through pipeline, the bottom of insulation filter is installed third ball valve, one side of cylinder is installed MKS double guide fork box body, the top of MKS double guide fork box body is installed valve position indicator, one side of MKS double guide fork box body is installed oil cylinder.

[0005] Further preferably, two U-shaped plates are arranged on one side of the mounting frame, and operating holes are arranged at the front and rear ends of the U-shaped plates.

[0006] Further preferably, a pneumatic control valve pressure gauge is arranged at the front end of the pneumatic control valve.

[0007] Further preferably, a first needle valve and a second needle valve are arranged at the left and right sides of the hydraulic valve block group respectively.

[0008] Further preferably, an accumulator pressure gauge is arranged at the bottom of the accumulator.

[0009] Further preferably, a hydraulic manual valve is arranged at the top of the hydraulic valve block group.

[0010] Further preferably, a U-shaped frame is arranged at the front end of the mounting frame, and a manual pump handle is inserted through one side of the U-shaped frame.

[0011] Compared with the prior art, the utility model has the advantages of:

[0012] In the utility model, the manual reset function can ensure that the valve rapidly cuts off fluid supply in an emergency, effectively prevents fluid leakage and accidents, and further ensures that the equipment continues to work normally. In addition, when the high-low pressure pilot valve detects abnormal pipeline fluid pressure (ultra-high / ultra-low), the gas flow is automatically cut off, and the valve is reopened through the manual reset function, ensuring that the equipment continues to work normally. In addition, the manual reset function improves the reliability and safety of the system. The design of the manual reset ball valve also includes a tamper-proof function. Unless the ball valve handle is reversed manually, it cannot be operated, further ensuring the safety of the system.

[0013] In the utility model, the partial stroke test is mainly used in pneumatic valves, especially in emergency shut-off valves ESD and emergency vent valves ESV. In the case of long-term inactivity, the mechanical parts may be stuck or jammed, resulting in unreliable operation in an emergency. The PST function ensures that the valve can respond normally when needed, and does not affect the normal operation of the entire system. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a front view structural schematic diagram of the utility model;

[0015] Figure 2 It is a front view structural schematic diagram of the utility model;

[0016] Figure 3 It is a front view structural schematic diagram of the utility model; Figure 1 It is an enlarged structural schematic diagram of A in the utility model;

[0017] Figure 4 It is a front view structural schematic diagram of the utility model;Figure 1 Amplification structure schematic view in B in the figure;

[0018] Figure 5 The utility model discloses a working principle structure schematic view.

[0019] In the figure: 1, mounting frame;2, nitrogen cylinder;3, energy accumulator;4, protection box;5, low pressure pilot valve;6, high pressure pilot valve;7, check valve;8, insulation filter;9, first three-way valve;10, pneumatic control valve;11, pneumatic control valve pressure gauge;12, second three-way valve;13, oil tank;14, hydraulic valve block group;15, hydraulic manual valve;16, first needle valve;17, second needle valve;18, first ball valve;19, second ball valve;20, energy accumulator pressure gauge;21, third ball valve;22, air cylinder;23, MKS double guide fork box body;24, valve position indicator;25, oil cylinder. DETAILED DESCRIPTION

[0020] The technical scheme in the embodiments of the utility model will be apparently and completely described below with the drawings in the embodiments of the utility model, and apparently, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skill workers in the field without creative labor belong to the range of protection of the utility model.

[0021] Please refer to Figures 1 to 5 The utility model provides a technical scheme: a low pressure executor, including mounting frame 1 and air cylinder 22, the side of mounting frame 1 is installed with nitrogen cylinder 2, the rear end middle part of mounting frame 1 is installed with energy accumulator 3, the front end upper portion of mounting frame 1 is installed with protection box 4, the inner wall of protection box 4 one side is installed with low pressure pilot valve 5 and high pressure pilot valve 6, the inner wall top of protection box 4 is installed with check valve 7, the bottom of low pressure pilot valve 5 is connected with insulation filter 8 through pipeline, insulation filter 8 is connected with first three-way valve 9 through pipeline, first three-way valve 9 is connected with pneumatic control valve 10 through pipeline, the bottom of pneumatic control valve 10 is connected with second three-way valve 12 through pipeline, the rear end lower portion of mounting frame 1 is installed with oil tank 13, the lower portion of the inner wall of mounting frame 1 is installed with hydraulic valve block group 14, one side of hydraulic valve block group 14 is connected with first ball valve 18 through pipeline, the bottom of the outer wall of high pressure pilot valve 6 is connected with second ball valve 19 through pipeline, the bottom of insulation filter 8 is installed with third ball valve 21, one side of air cylinder 22 is installed with MKS double guide fork box body 23, the top of MKS double guide fork box body 23 is installed with valve position indicator 24, one side of MKS double guide fork box body 23 is installed with oil cylinder 25.

[0022] In the embodiment, as Figure 1As shown, one side of the mounting frame 1 is provided with two U-shaped plates, and the front and rear ends of the U-shaped plates are provided with running holes; the nitrogen cylinder 2 can be limited by being buckled in the circular holes of the two U-shaped plates, thereby improving the stability of the nitrogen cylinder 2 during use.

[0023] In the embodiment, as shown in the figure, Figure 3 The front end of the gas control valve 10 is provided with a gas control valve pressure gauge 11; the gas pressure at the front end of the gas control valve 10 can be displayed in real time, so that the operator can intuitively understand the pressure condition in the system and judge whether the pressure is within the normal working range, so as to find the abnormality in time.

[0024] In the embodiment, as shown in the figure, Figure 4 The left and right sides of the hydraulic valve block group 14 are respectively provided with a first needle valve 16 and a second needle valve 17; the first needle valve 16 and the second needle valve 17 are respectively located on the left and right sides of the hydraulic valve block group 14, so as to facilitate the operator to adjust according to the demand.

[0025] In the embodiment, as shown in the figure, Figure 1 The bottom of the accumulator 3 is provided with an accumulator pressure gauge 20; the operator can intuitively and in real time understand the pressure condition in the accumulator 3, judge whether the pressure is within the normal working range, and through the reading of the accumulator pressure gauge 20, the problem can be found in time and corresponding measures can be taken.

[0026] In the embodiment, as shown in the figure, Figure 4 The top of the hydraulic valve block group 14 is provided with a hydraulic manual valve 15; the handle is inserted into the hole of the manual pump, and the handle is repeatedly pressed, so that the valve can be slowly opened, and the operation and use can be carried out in the case that there is no hydraulic power source and no power gas source on the spot.

[0027] In the embodiment, as shown in the figure, Figure 1 The front end of the mounting frame 1 is provided with a U-shaped frame, and a manual pump handle is inserted through one side of the U-shaped frame; when the use of the manual pump handle is finished, the manual pump handle is inserted into the U-shaped frame for placement, and when used, the manual pump handle is directly taken off from the U-shaped frame, thereby improving the convenience during use.

[0028] The use method and advantages of the low-pressure actuator are as follows:

[0029] As shown in the figure, Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, first in remote control mode, pipeline pressure is normal, high pressure pilot valve 6 and low pressure pilot valve 5 do not work, pneumatic control valve 10 gas path is unobstructed, gas source enters cylinder 22 through pneumatic control valve 10, and the valve is automatically opened under the action of the external gas source; in the case of abnormal pipeline pressure (over high / low), high pressure pilot valve 6 and low pressure pilot valve 5 work, providing a signal gas acting on pneumatic control valve 10, and pneumatic control valve 10 changes direction - at this time, the gas path of pneumatic control valve 10 is not open, the remote gas source is cut off, and the hydraulic oil of accumulator 3 returns to oil cylinder 25 through the oil return pipe, and the valve is automatically closed;

[0030] Under normal circumstances, hydraulic manual operation is only used in the absence of hydraulic power source and on-site power gas source, first close the first ball valve 18, then insert the handle into the hole of the manual pump, press the handle repeatedly, the valve can be slowly opened until the valve is fully opened, and the handle of the manual pump must be removed and returned to its original position;

[0031] In the absence of hydraulic power source and power gas source, open the first ball valve 18, and the valve is automatically closed;

[0032] Due to the alternation of day and night and seasons, the change of environmental temperature will cause reasonable fluctuation of the pressure at the interface of accumulator 3, and the user needs to regularly detect the pressure value change of the pressure gauge (valve full close to accumulator 3 pressure 2.5MPa), in the remote control mode position, close the first ball valve 18, close the second needle valve 17, open the first needle valve 16, and press the manual pump up and down to supplement the pressure of accumulator 3 (observe the oil level to the safe position), and return to the remote control mode after the operation is completed;

[0033] In the pneumatic valve, especially in the emergency shut-off valve ESD and emergency vent valve ESV, etc., these valves may have problems such as mechanical part sticking or jamming in the case of long-term inactivity, which may cause the valve to fail to act reliably in an emergency, and the PST (partial stroke test) function can ensure that the valve can respond normally when needed, while not affecting the normal operation of the entire system;

[0034] The manual reset function can ensure that the valve quickly cuts off the fluid supply in an emergency, effectively preventing fluid leakage and accidents, in addition, when the high and low pressure pilot valve detects abnormal pipeline fluid pressure (over high / low), it will automatically cut off the gas flow and reopen the valve through the manual reset function to ensure that the equipment continues to work normally, secondly, the manual reset function improves the reliability and safety of the system, and the design of the manual reset ball valve also includes an anti-tampering function, which cannot be operated unless the ball valve handle is reversed manually, further ensuring the safety of the system;

[0035] When the high-low pressure pilot valve detects abnormal pipeline fluid pressure (too high / too low), the valve is fully closed, and the system needs to be manually reset, first adjust the second three-way ball valve, at this time the second three-way ball valve will be exhaust; After the second three-way ball valve is exhausted for about 5 seconds, adjust the second three-way ball valve so that the system is in a normal working state.

[0036] The basic principle, main features and advantages of the present application are shown and described above. The skilled person in the art should understand that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A low pressure actuator comprising a mounting bracket (1) and a cylinder (22), characterized in that: The nitrogen cylinder (2) is installed on one side of the mounting frame (1), the accumulator (3) is installed in the middle of the rear end of the mounting frame (1), the protective box (4) is installed on the front end of the mounting frame (1), the low-pressure pilot valve (5) and the high-pressure pilot valve (6) are installed on the inner wall of the protective box (4), the one-way valve (7) is installed on the top of the inner wall of the protective box (4), the bottom of the low-pressure pilot valve (5) is connected with the insulation filter (8) through a pipeline, the insulation filter (8) is connected with the first three-way valve (9) through a pipeline, the first three-way valve (9) is connected with the air control valve (10) through a pipeline, the bottom of the air control valve (10) is connected with the second three-way valve (12) through a pipeline, the oil tank (13) is installed on the lower end of the rear end of the mounting frame (1), the hydraulic valve block group (14) is installed on the lower end of the inner wall of the mounting frame (1), one side of the hydraulic valve block group (14) is connected with the first ball valve (18) through a pipeline, the bottom of the outer wall of the high-pressure pilot valve (6) is connected with the second ball valve (19) through a pipeline, the bottom of the insulation filter (8) is provided with the third ball valve (21), the MKS double-guide yoke box body (23) is installed on one side of the air cylinder (22), the valve position indicator (24) is installed on the top of the MKS double-guide yoke box body (23), and the oil cylinder (25) is installed on one side of the MKS double-guide yoke box body (23).

2. A low pressure actuator according to claim 1, characterized in that: Two U-shaped plates are arranged on one side of the mounting frame (1), and operating holes are arranged at the front and rear ends of the U-shaped plates.

3. A low pressure actuator according to claim 1, characterized in that: The air control valve pressure gauge (11) is installed on the front end of the air control valve (10).

4. A low pressure actuator according to claim 1, characterized in that: The first needle valve (16) and the second needle valve (17) are respectively installed on the left and right sides of the hydraulic valve block group (14).

5. A low pressure actuator as claimed in claim 1, characterized in that: The accumulator pressure gauge (20) is installed on the bottom of the accumulator (3).

6. A low pressure actuator as claimed in claim 1, characterized in that: The hydraulic manual valve (15) is installed on the top of the hydraulic valve block group (14).

7. A low pressure actuator as claimed in claim 1, wherein: The U-shaped frame is arranged on the front end of the mounting frame (1), and the manual pump handle is inserted through one side of the U-shaped frame.

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