Overpressure self-closing temperature and pressure reducer
By adopting the linkage control between pneumatic gate valve and safety valve in the temperature reduction and pressure reducer, the problem of the gas source not being automatically cut off when the steam pipeline is overpressurized in the prior art is solved, and the effective utilization of steam and the improvement of equipment safety performance is achieved.
Patent Information
- Application Number
- CN202420606322.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-27
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-03-27
AI Technical Summary
When the existing temperature reduction pressure reducer is overpressurized in the steam pipeline, the safety valve can only automatically evacuate the steam to reduce the pressure, but cannot automatically cut off the gas source, resulting in waste of steam.
An overpressure self-closed temperature reducing pressure reducer is designed, using a pneumatic gate valve and a safety valve to form an overpressure closed loop control through the pneumatic control chamber and the pressure lead pipe, and the automatic opening and closing of the gate valve is achieved by using a pneumatic elastic film and valve stem. Cut off the steam pipe.
The rapid linkage reaction between the gate valve and safety valve at the steam inlet is achieved, which avoids steam waste, improves the safety performance of the equipment, and reduces the impact of steam power on the equipment's vibration.
Smart Images
Figure CN222256162U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a temperature reducing and pressure reducing device, in particular to an overpressure self-closing temperature reducing and pressure reducing device. Background Art
[0002] CN219493868U discloses a temperature reducing and pressure reducing device which is easy to adjust, comprising an air intake pipe, a temperature reducing and pressure reducing valve and a steam pipe, wherein one end of the air intake pipe is connected to the temperature reducing and pressure reducing valve, the other end of the temperature reducing and pressure reducing valve is connected to the steam pipe, a temperature reducing water valve is installed on the surface of the steam pipe, a safety valve is also installed on the surface of the steam pipe, and a pressure sensor is installed on the surface of the air intake pipe.
[0003] The disadvantage is that when the steam in the steam pipe is over-pressured, the safety valve can only start to open and discharge the steam through the exhaust pipe to reduce the pressure, but will not automatically cut off the gas source (the operator still needs to manually cut off the gas source); thus resulting in unnecessary waste of steam. Utility Model Content
[0004] The technical problem to be solved by the utility model is: to overcome the deficiencies of the above-mentioned background technology and provide an overpressure self-closing temperature and pressure reducing device, which can realize a rapid linkage reaction between the gate valve and the safety valve at the inlet to improve the safety performance.
[0005] The technical solution provided by the utility model is:
[0006] An overpressure self-closing desuperheater and pressure reducer comprises a steam pipe equipped with a gate valve, a steam mixing pipe equipped with a safety valve and inputting desuperheating water through a desuperheating water pipe, and a pressure reducing valve installed between the steam pipe and the steam mixing pipe through a flange; the characteristics are:
[0007] The gate valve is a pneumatic gate valve, and the pneumatic control chamber of the pneumatic gate valve is connected to the exhaust pipe of the safety valve through the pressure-leading pipe, thereby forming an overpressure closed-loop control of the steam mixing pipe.
[0008] The pneumatic control chamber is divided into two upper and lower chambers by a pneumatic elastic film fixed to the inner cavity. The lower surface of the middle part of the pneumatic elastic film is connected to the valve disc through a vertically movable valve stem to control the opening and closing of the gate valve. The lower surface of the pneumatic elastic film is also supported by a plurality of springs, which are vertically installed at the bottom of the lower chamber.
[0009] The shell of the pneumatic control chamber includes two flange-type covers connected up and down by bolts; the edges around the pneumatic elastic film are fixed by overlapping the two flange-type covers.
[0010] The pressure-guiding pipe is connected to the safety valve through a three-way connection.
[0011] The safety valve is a spring safety valve.
[0012] The beneficial effects of the utility model are as follows: since the gate valve and the safety valve at the steam inlet are linked to each other, they can react quickly and provide sufficient power to close the gate valve in place, which not only effectively avoids unnecessary waste of steam and improves the safety performance of the equipment, but also the steam as a power will not produce excessive vibration and will not cause damage to the equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic diagram of the system structure of an embodiment of the utility model.
[0014] Figure 2 yes Figure 1 Enlarged structural diagram of the medium gate valve.
[0015] Figure 3 yes Figure 2 Enlarged structural diagram of the pneumatic control room (partial section view)
[0016] Numbers in the figure: Numbers in the figure: gate valve 1, steam pipe 2, exhaust pipe 3, pressure reducing valve 4, cooling water pipe 5, steam mixing pipe 6, safety valve 7, pressure gauge 8, thermometer 9, pressure guide pipe 10, pneumatic elastic film 11, spring 12. DETAILED DESCRIPTION
[0017] The following is a further description with reference to the embodiments shown in the accompanying drawings.
[0018] The existing safety system of the temperature and pressure reducer only has a safety valve; when the pressure in the steam pipeline is too high, the safety valve will be triggered to discharge steam to relieve the pressure; and the pressure relief needs to be stopped manually (there is no other link in the safety system to prevent the steam pressure from being too high), which will cause a large amount of steam to be discharged, directly causing economic losses. The utility model provides a solution to this problem.
[0019] The overpressure self-closing desuperheater and pressure reducer shown in the attached drawings comprises a steam pipe equipped with a gate valve, a steam mixing pipe equipped with a safety valve and inputting desuperheating water through a desuperheating water pipe, and a pressure reducing valve installed between the steam pipe and the steam mixing pipe through a flange; the gate valve comprises a vertically movable valve stem and a valve disc connected to the bottom end of the valve stem and capable of opening and closing the gate valve; the above structure is similar to the existing desuperheater and pressure reducer.
[0020] The improvement of the utility model is that the gate valve adopts a pneumatic gate valve, and the pneumatic control chamber of the pneumatic gate valve is connected to the exhaust pipe of the safety valve through the pressure-leading pipe, thereby forming an overpressure closed-loop control of the steam mixing pipe.
[0021] Depend on Figure 3It can be seen that the shell of the pneumatic control chamber includes two upper and lower flange covers, which are connected as a whole by bolts. A pneumatic elastic film 11 is also installed in the pneumatic control chamber to separate the inner cavity of the pneumatic control chamber into two upper and lower chambers. The edges of the pneumatic elastic film are fixed by two flange covers to seal and isolate the upper and lower chambers.
[0022] The lower surface of the middle part of the pneumatic elastic film is connected to the top end of the valve stem, so that when the middle area of the pneumatic elastic film moves up and down, the valve stem can be driven to move vertically, thereby controlling the opening and closing of the gate valve.
[0023] A plurality of springs 12 are also vertically installed in the lower chamber of the pneumatic control chamber; the bottom ends of the plurality of springs are fixed to the bottom of the lower chamber, and the top ends of the plurality of springs support the lower surface of the pneumatic elastic film upward.
[0024] The working principle of the utility model is: when working normally, the upper chamber of the pneumatic control chamber is at normal air pressure, the pneumatic elastic film is in a normal position under the support of a number of springs, and the gate valve opens normally (the valve stem drives the valve disc to open the valve port);
[0025] When the safety valve detects that the pressure in the steam mixing pipe is too high, it will automatically open the valve to exhaust; the exhaust air flow is transmitted to the pneumatic control room of the gate valve through the exhaust pipe, and then the pneumatic elastic film is quickly pressed down, and the gate valve is closed through the valve disc at the bottom of the valve stem, thereby cutting off the steam pipe and avoiding steam waste.
Claims
1. An overpressure self-closing desuperheater and pressure reducer, comprising a steam pipe (2) equipped with a gate valve (1), a steam mixing pipe (6) equipped with a safety valve (7) and into which desuperheating water is input through a desuperheating water pipe (5), and a pressure reducing valve (4) installed between the steam pipe and the steam mixing pipe through a flange; characterized in that: The gate valve is a pneumatic gate valve, and the pneumatic control chamber of the pneumatic gate valve is connected to the exhaust pipe (3) of the safety valve through a pressure-inducing pipe (10), thereby forming an overpressure closed-loop control of the steam mixing pipe.
2. The overpressure self-closing temperature and pressure reducing device according to claim 1, characterized in that: The pneumatic control chamber is divided into two upper and lower chambers by a pneumatic elastic film (11) fixed to the inner cavity. The lower surface of the middle part of the pneumatic elastic film is connected to the valve disc through a vertically movable valve stem to control the opening and closing of the gate valve. The lower surface of the pneumatic elastic film is also supported by a plurality of springs (12) vertically installed at the bottom of the lower chamber.
3. The overpressure self-closing temperature and pressure reducing device according to claim 2, characterized in that: The shell of the pneumatic control chamber includes two flange-type covers connected up and down by bolts; the edges of the pneumatic elastic film are fixed by overlapping the two flange-type covers.
4. The overpressure self-closing temperature and pressure reducing device according to claim 3 is characterized in that: The pressure-guiding pipe is connected to the safety valve through a three-way connection.