Marine steam pressure regulating device

Abstract

The invention discloses a marine steam pressure regulating device, relates to the technical field of steam pressure regulation, and aims to solve the problems that an existing marine steam pressure regulating device cannot reduce high-pressure steam to a low-pressure interval and cannot realize accurate output pressure regulation in the low-pressure interval. The system comprises a steam source, a first-stage pressure regulating device, a second-stage pressure regulating device, connecting pipelines and steam using equipment, the output end of the steam source is connected with the air inlet end of the first-stage pressure regulating device, the air outlet end of the first-stage pressure regulating device is connected with the air inlet end of the second-stage pressure regulating device through a connecting pipeline I, and the air outlet end of the second-stage pressure regulating device is connected with the steam using equipment through a connecting pipeline II. The first-stage pressure regulating device comprises a first-stage valve body, a plurality of throttling pieces and throttling rings, the throttling pieces are installed in the first-stage valve body at intervals, and the adjacent throttling pieces are supported through the throttling rings at intervals. The pressure reducing device is used for reducing pressure of output steam of a ship power system, and precise control over output air pressure is achieved through second-stage pressure reduction.

Description

Technical Field

[0001] The invention relates to the technical field of steam pressure regulation, and in particular to a marine steam pressure regulating device. Background Art

[0002] The steam pressure reducing valve adjusts the flow of steam by controlling the opening of the opening and closing parts in the valve body, reduces the steam pressure, and adjusts the opening of the opening and closing parts by means of the pressure behind the valve, so that the pressure behind the valve is kept within a certain range. When the inlet pressure is constantly changing, the outlet pressure is kept within the set range to protect the subsequent use of living and production equipment; in the ship steam system, the power system can provide 2-3MPa steam, and the steam-using equipment needs to use 0.1-0.5MPa steam, so a steam pressure reducing device needs to be installed when the power system is connected to the steam-using equipment;

[0003] Existing steam pressure regulating valves often use gate valves or stop valves, which adjust the gas flow through the steam by rotating the valve stem to control the opening and closing of the valve plate. However, the existing steam pressure regulating valves cannot reduce high-pressure steam to a low-pressure range and achieve accurate output pressure adjustment in the low-pressure range. The pressure output by the ship's power system is too different from the air pressure used by the gas-using equipment, so traditional steam pressure regulating devices cannot be used in the ship's pressure regulation process. Summary of the invention

[0004] In order to solve the problem that the existing marine steam pressure regulating device cannot reduce high-pressure steam to a low-pressure range and achieve accurate output pressure adjustment in the low-pressure range, the present invention further provides a marine steam pressure regulating device to solve the problems raised in the above background technology.

[0005] The technical solution of the present invention is:

[0006] A marine steam pressure regulating device comprises a steam source, a first-level pressure regulating device, a second-level pressure regulating device, a connecting pipeline and steam-using equipment, wherein the output end of the steam source is connected to the air inlet end of the first-level pressure regulating device, the air outlet end of the first-level pressure regulating device is connected to the air inlet end of the second-level pressure regulating device through a connecting pipeline I, and the air outlet end of the second-level pressure regulating device is connected to the steam-using equipment through a connecting pipeline II;

[0007] The level I pressure regulating device includes a level I valve body, multiple throttle plates and throttle rings. Multiple throttle plates are installed at intervals in the level I valve body, and adjacent throttle plates are supported by throttle ring intervals. An adjusting nut is detachably fixed in the level I valve body, and the adjusting nut is used to fix the throttle plate and the throttle ring in the level I valve body. The throttle plate is sealed and connected to the adjusting nut and the throttle ring respectively through a gasket II, and the air outlet end of the level I valve body is connected to the connecting pipeline I through a threaded joint.

[0008] Furthermore, the level II pressure regulating device includes a level II valve body, a valve stem and a clamping nut. The level II valve body is threadedly connected to the valve stem, a sloped steam channel is arranged on the valve stem, a packing seat ring for sealing is installed between the level II valve body and the valve stem, a plurality of supporting packings for supporting the packing seat ring are installed at the right end of the packing seat ring, a packing gland is installed at the right end of the level II valve body, the packing gland is used to fix the packing seat ring and the supporting packing, and a clamping nut is arranged at the right end of the level II valve body, the clamping nut is used to clamp the packing gland.

[0009] Furthermore, an annular air guide chamber is provided in the stage II valve body, the annular air guide chamber is connected to the air outlet end of the stage II valve body, and the annular air guide chamber is used to form a steam outlet with the sloped steam channel.

[0010] Furthermore, the angle between the sloped steam passage and the axis of the valve stem is 30°.

[0011] Furthermore, the level I pressure regulating device is used to adjust the steam pressure from 2-3MPa to 0.5-0.8MPa, and the level II pressure regulating device is used to adjust the steam pressure from 0.5-0.8MPa to 0.1-0.5MPa.

[0012] Furthermore, a throttling hole is arranged at the center of the throttling plate, and the diameter of the throttling hole is 3-6 mm.

[0013] Furthermore, the clamping nut is provided with a screw, and the screw is used to lock the valve stem.

[0014] Furthermore, the throttle ring is a hollow tubular structure.

[0015] Furthermore, pressure gauge I and pressure gauge II are installed on the connecting pipeline I and the connecting pipeline II respectively.

[0016] Furthermore, a flange is provided at the air inlet end of the first-stage pressure regulating device, and the first-stage pressure regulating device is connected to the output end of the steam source via the flange.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. A marine steam pressure regulating device is provided with a level I pressure regulating device and a level II pressure regulating device, wherein the level I pressure regulating device is a fixed pressure reducing mechanism, which can reduce the steam pressure from 2-3MPa to 0.5-0.8MPa, thereby realizing a large pressure reduction; the level II pressure regulating device is a variable pressure reducing mechanism, which can reduce the steam pressure from 0.5-0.8MPa to 0.1-0.5MPa, thereby realizing a small and precise pressure reduction; in use, by observing the value of the pressure gauge II, the final output gas pressure is adjusted to the target value. The device divides the pressure reduction process into a large-scale pressure reduction process and a precise pressure reduction process, thereby realizing the reduction of high-pressure steam to a low-pressure range, and realizing precise output pressure adjustment in the low-pressure range;

[0019] 2. The adjustment range of the Class I pressure regulating device is not limited to 2-3MPa down to 0.5-0.8MPa. There are multiple throttle plates installed detachably inside. By changing the number of throttle plates and replacing throttle plates with different sizes of central throttle holes, the pressure reduction range of the large-scale pressure reduction process can be changed, which is more flexible for different use environments;

[0020] 3. The II-level pressure regulating device is provided with a sloped steam channel and an annular air guide chamber. During the rotation of the valve stem, the size of the steam outlet formed by the sloped steam channel and the annular air guide chamber can be adjusted with high precision, and a cut-off shoulder can completely close the airflow, so that the steam pressure regulating device has the advantage of high output pressure adjustment precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural schematic diagram of the pressure regulating pipeline in the steam pressure regulating device;

[0022] Figure 2 This is a schematic diagram of the structure of the first-level pressure regulating device in this steam pressure regulating device;

[0023] Figure 3 This is a longitudinal section view of the second-level pressure regulating device in this steam pressure regulating device;

[0024] Figure 4 These are the front view and left view of the valve stem and the sloped steam channel in the steam pressure regulating device.

[0025] In the figure: 1, steam source; 2, level I pressure regulating device; 3, level II pressure regulating device; 4, connecting pipeline; 5, steam-using equipment; 6, pressure gauge I; 7, pressure gauge II; 8, connecting pipeline I; 201, threaded joint; 202, level I valve body; 203, gasket I; 204, adjusting nut; 205, gasket II; 206, 208, 209, 210, throttle plate; 207, throttle ring; 211, flange; 301, level II valve body; 302, valve stem; 303, clamping nut; 304, packing gland; 305, packing seat ring; 306, screw; 307, supporting packing; 308, sloped steam channel; 309, annular air guide chamber; 310, cut-off shoulder. DETAILED DESCRIPTION

[0026] Specific implementation method 1: See Figure 1-2 As shown, a marine steam pressure regulating device, this embodiment includes a steam source 1, a first-level pressure regulating device 2, a second-level pressure regulating device 3, a connecting pipeline 4 and a steam-using device 5, the output end of the steam source 1 is connected to the air inlet end of the first-level pressure regulating device 2, the air outlet end of the first-level pressure regulating device 2 is connected to the air inlet end of the second-level pressure regulating device 3 through a connecting pipeline I8, and the air outlet end of the second-level pressure regulating device 3 is connected to the steam-using device 5 through a connecting pipeline II4;

[0027] The first-level pressure regulating device 2 includes a first-level valve body 202, multiple throttle plates 206, 208, 209, 210 and a throttle ring 207. Multiple throttle plates 206, 208, 209, 210 are installed at intervals in the first-level valve body 202, and adjacent throttle plates 206, 208, 209, 210 are supported at intervals by throttle rings 207. An adjusting nut 204 is detachably fixed in the first-level valve body 202, and the adjusting nut 204 is used to fix the throttle plates 206, 208, 209, 210 and the throttle ring 207 in the first-level valve body 202. The throttle plates 206, 208, 209, 210 are respectively sealed and connected to the adjusting nut 204 and the throttle ring 207 through a gasket II 205, and the air outlet end of the first-level valve body 202 is connected to the connecting pipeline I8 through a threaded joint 201.

[0028] Specific implementation method 2: See Figure 1-2 As shown, the first-level pressure regulating device 2 of this embodiment is used to adjust the steam pressure from 2-3MPa to 0.5-0.8MPa, and the second-level pressure regulating device 3 is used to adjust the steam pressure from 0.5-0.8MPa to 0.1-0.5MPa.

[0029] Specific implementation method three: see Figure 1-2 As shown, in this embodiment: a throttling hole is arranged at the center of the throttling plates 206, 208, 209, 210, and the diameter of the throttling hole is 3-6 mm.

[0030] Specific implementation method four: see Figure 1-2 As shown, the throttle ring 207 of this embodiment is a hollow tubular structure.

[0031] Specific implementation method five: see Figure 1-2 As shown, the connecting pipeline I8 and the connecting pipeline II4 of this embodiment are respectively installed with a pressure gauge I6 and a pressure gauge II7.

[0032] Specific implementation method six: see Figure 1-2 As shown, the air inlet end of the first-stage pressure regulating device 2 of this embodiment is provided with a flange 211 , and the first-stage pressure regulating device 2 is connected to the output end of the steam source 1 via the flange 211 .

[0033] Furthermore, the above-mentioned implementation is the overall working process of the ship steam pressure regulating device and the working principle of the first-level pressure regulating device 2, wherein the steam source 1 is the steam output joint of the ship steam system, and a flange is provided at the joint of the steam source 1, and the flange is connected to the flange 211 in the first-level pressure regulating device 2, so that the ship steam pressure regulating device is connected to the ship steam system. A pressure gauge I6 is provided on the connecting pipeline I8, and a pressure gauge II7 is provided on the connecting pipeline II4. The pressure gauge I6 is used to detect whether the steam input to the second-level pressure regulating device 2 is within the safe pressure regulating range, and the pressure gauge II7 is used to display the pressure value of the final input steam-using equipment 5. The first-level valve body 202 is a hollow tubular structure, and a plurality of throttle plates are installed inside it. This device takes four throttle plates 206, 208, 209, and 210 as an example. A support shoulder is provided in the first-level valve body 202, and the support shoulder is used to support the throttle plate 210 located at the leftmost end. Each two adjacent throttle plates are supported by a throttle ring 207, which is a hollow tubular structure. Both ends of each throttle plate 206, 208, 209, 210 are sealed and connected to the first-level valve body 202 and the adjusting nut 204 through a gasket II 205. The center of the adjusting nut 204 and the threaded joint 201 is provided with a through hole for steam to pass through, so that the steam can only pass through the throttle hole in the center of each throttle plate in turn to achieve steam decompression. The adjusting nut 204 is used to fix the throttle plates 206, 208, 209, 210 and the throttle ring 207. When the decompression efficiency of the first-level pressure regulating device 2 needs to be changed, the adjusting nut 204 is removed, the number of throttle plates is replaced, increased or reduced, and the matching throttle ring 207 is replaced to adjust the decompression efficiency of the first-level pressure regulating device 2. The right side air outlet end of the pressure reducing efficiency of the level I pressure regulating device 2 is provided with an internal thread, which can be connected to the internal thread of the connecting pipeline I8 through a bidirectional threaded joint 201.

[0034] When in use, before opening the level II pressure regulating device 3, observe whether the vertical display of the pressure gauge I6 is within the safe range, then continue to observe the pressure gauge II7, and rotate the valve stem 302 of the level II pressure regulating device 3 until the pressure value reaches 0.2MPa and the valve stem is stopped. At this time, the outflowing steam pressure is the pressure required by the steam-using equipment, and the gas pressure regulation process is completed.

[0035] Specific implementation method seven: See Figure 2-4As shown, the stage II pressure regulating device 3 of the present embodiment comprises a stage II valve body 301, a valve stem 302 and a clamping nut 303. The stage II valve body 301 is threadedly connected to the valve stem 302. A sloped steam channel 308 is arranged on the valve stem 302. A packing seat ring 305 for sealing is installed between the stage II valve body 301 and the valve stem 302. A plurality of supporting packings 307 for supporting the packing seat ring 305 are installed at the right end of the packing seat ring 305. A packing gland 304 is installed at the right end of the stage II valve body 301. The packing gland 304 is used to fix the packing seat ring 305 and the supporting packing 307. A clamping nut 303 is arranged at the right end of the stage II valve body 301. The clamping nut 303 is used to clamp the packing gland 304.

[0036] Specific implementation method eight: See Figure 2-4 As shown, an annular air guide chamber 309 is provided in the stage II valve body 301 of this embodiment. The annular air guide chamber 309 is connected to the gas outlet end of the stage II valve body 301 , and the annular air guide chamber 309 is used to form a steam outlet with the sloped steam channel 308 .

[0037] Specific implementation method nine: See Figure 2-4 As shown, the angle between the sloped steam passage 308 and the axial direction of the valve stem 302 in this embodiment is 30°.

[0038] Specific implementation method ten: See Figure 2-3 As shown, the clamping nut 303 of this embodiment is provided with a screw 306 , and the screw 306 is used to lock the valve stem 302 .

[0039] Furthermore, the above embodiment is the working principle of the II-level pressure regulating device 3, a valve cavity is provided in the II-level valve body 301, and the valve stem 302 is threadedly connected in the II-level valve body 301, so that after the valve body 301 is rotated, the valve body 301 moves along the axial direction of the valve cavity. The packing seat ring 305 and the supporting packing 307 are used for sealing between the II-level valve body 301 and the valve stem 302, the packing gland 304 is used to support the packing seat ring 305 and the packing seat ring 305 to the left, and the right end of the valve stem 302 is threadedly connected with a clamping nut 303, and the clamping nut 303 is used to support the packing gland 304 to the left, and the cross-sectional area of ​​the right end of the packing gland 304 and the clamping nut 303 is increased to increase the extrusion force area. Since the valve stem 302 rotates in the level II valve body 301, when the valve stem 302 rotates to the ramp-shaped steam channel 308 downward, the gas cannot flow along the ramp-shaped steam channel 308 to the gas outlet of the level II pressure regulating device 3. In order to allow the ramp-shaped steam channel 308 and the gas outlet to still form a steam outlet after the valve body 301 rotates, an annular air guide chamber 309 is provided in the level II valve body 301. During use, the valve stem 302 is unscrewed, so that the steam outlet formed by the annular air guide chamber 309 and the ramp-shaped steam channel 308 gradually increases until the pressure gauge II 7 reaches the target value, at this time, the screw 306 is tightened to lock the valve stem 302 to complete the second decompression of the steam.

[0040] Furthermore, the steam pressure regulating device realizes two series pressure regulation by setting the first-level pressure regulating device and the second-level pressure regulating device, which can reduce the steam pressure from 2-3MPa to 0.5-0.8MPa, and then reduce the steam pressure from 0.5-0.8MPa to any pressure value between 0.1-0.5MPa. The pressure reduction process is divided into a large-scale pressure reduction process and a precise pressure reduction process, which can reduce the high-pressure steam to a low-pressure range and realize precise output pressure adjustment in the low-pressure range.

Claims

1. A marine steam pressure regulating device, characterized in that: It comprises a steam source (1), a first-stage pressure regulating device (2), a second-stage pressure regulating device (3), a connecting pipeline (4) and a steam-using device (5). The output end of the steam source (1) is connected to the air inlet end of the first-stage pressure regulating device (2), the air outlet end of the first-stage pressure regulating device (2) is connected to the air inlet end of the second-stage pressure regulating device (3) through a connecting pipeline I (8), and the air outlet end of the second-stage pressure regulating device (3) is connected to the steam-using device (5) through a connecting pipeline II (4). The first-level pressure regulating device (2) comprises a first-level valve body (202), a plurality of throttle plates (206, 208, 209, 210) and a throttle ring (207). The first-level valve body (202) is provided with a plurality of throttle plates (206, 208, 209, 210) installed at intervals, and adjacent throttle plates (206, 208, 209, 210) are supported at intervals by the throttle ring (207). The first-level valve body (202) is provided with a detachable adjusting nut ( 204), the adjusting nut (204) is used to fix the throttle plate (206, 208, 209, 210) and the throttle ring (207) in the first-level valve body (202), the throttle plate (206, 208, 209, 210) is respectively sealed and connected with the adjusting nut (204) and the throttle ring (207) through the gasket II (205), and the outlet end of the first-level valve body (202) is connected with the connecting pipeline I (8) through the threaded joint (201).

2. The marine steam pressure regulating device according to claim 1, characterized in that: The II-level pressure regulating device (3) comprises a II-level valve body (301), a valve stem (302) and a clamping nut (303); the II-level valve body (301) is threadedly connected to the valve stem (302); a sloped steam channel (308) is provided on the valve stem (302); a packing seat ring (305) for sealing is installed between the II-level valve body (301) and the valve stem (302); a plurality of supporting packings (307) for supporting the packing seat ring (305) are installed at the right end of the packing seat ring (305); a packing gland (304) is installed at the right end of the II-level valve body (301); the packing gland (304) is used to fix the packing seat ring (305) and the supporting packing (307); a clamping nut (303) is provided at the right end of the II-level valve body (301); the clamping nut (303) is used to clamp the packing gland (304).

3. The marine steam pressure regulating device according to claim 2, characterized in that: An annular air guide chamber (309) is arranged in the second-level valve body (301), and the annular air guide chamber (309) is connected to the gas outlet end of the second-level valve body (301). The annular air guide chamber (309) is used to form a steam outlet with the sloped steam channel (308).

4. The marine steam pressure regulating device according to claim 2, characterized in that: The angle between the sloped steam channel (308) and the axis of the valve stem (302) is 30°.

5. The marine steam pressure regulating device according to claim 1, characterized in that: The first-level pressure regulating device (2) is used to adjust the steam pressure from 2-3 MPa to 0.5-0.8 MPa, and the second-level pressure regulating device (3) is used to adjust the steam pressure from 0.5-0.8 MPa to 0.1-0.5 MPa.

6. The marine steam pressure regulating device according to claim 1, characterized in that: A throttling hole is arranged at the center of the throttling plate (206, 208, 209, 210), and the diameter of the throttling hole is 3-6 mm.

7. The marine steam pressure regulating device according to claim 2, characterized in that: The compression nut (303) is provided with a screw (306), and the screw (306) is used to lock the valve stem (302).

8. The marine steam pressure regulating device according to claim 1, characterized in that: The throttle ring (207) is a hollow tubular structure.

9. The marine steam pressure regulating device according to claim 1, characterized in that: The connecting pipeline I (8) and the connecting pipeline II (4) are respectively installed with a pressure gauge I (6) and a pressure gauge II (7).

10. The marine steam pressure regulating device according to claim 1, characterized in that: The air inlet end of the first-stage pressure regulating device (2) is provided with a flange (211), and the first-stage pressure regulating device (2) is connected to the output end of the steam source (1) via the flange (211).

Images