Attemperator

Abstract

The application discloses a desuperheater, which comprises a valve sleeve, a valve body and a bypass pipeline. The valve sleeve is provided with a valve sleeve inner cavity (201). The valve body is sleeved on the outside of the valve sleeve and is provided with a valve body inner cavity (101) which is in communication with the valve sleeve inner cavity (201). The bypass pipeline is located on the outside of the valve body and comprises a bypass upper port and a bypass lower port which are in communication with the valve sleeve inner cavity (201) and are arranged axially and spaced apart. The medium of the desuperheater can flow through the valve sleeve inner cavity (201) and the valve body inner cavity (101) along the bypass pipeline, so as to preheat the valve body and the valve sleeve. The bypass pipeline is provided with a discharge pipeline (810) between the bypass upper port and the bypass lower port, so that the impurities in the valve sleeve inner cavity (201) can be discharged along the discharge pipeline (810). The desuperheater can be purged, discharged and preheated without disassembly, cost is saved, operation is convenient, construction period is greatly saved, and stable operation of the desuperheater is ensured.

Description

Technical Field

[0001] This invention relates to the field of desuperheater technology, and more specifically, to a desuperheater and pressure reducer. Background Technology

[0002] A desuperheater / pressure reducer is a device that uses water as a cooling medium to regulate the pressure and temperature of superheated or reheated steam. Its main function is to control the pressure and temperature of secondary steam to meet the specified parameters for the safe operation of pipeline process equipment. Traditional desuperheaters / pressure reducers use pilot-operated valve components. These are suitable for high-temperature, high-pressure, and critical shut-off conditions. The linear action of the valve components causes the pilot valve core to actuate first, releasing the pressure in the valve chamber. The main valve core then actuates together with the pilot valve core after the force is balanced. However, sudden temperature increases in a cold state can easily cause the valve to jam, and the desuperheater / pressure reducer is inconvenient to maintain and cannot quickly and easily remove impurities from the pipeline network. Summary of the Invention

[0003] The purpose of this invention is to provide a novel desuperheating and pressure reducing device that can be purged, drained, and preheated without disassembly, saving costs, being easy to operate, significantly reducing construction time, and ensuring stable operation of the desuperheating and pressure reducing device.

[0004] To achieve the above objectives, the present invention provides a desuperheating and pressure reducing device, the desuperheating and pressure reducing device comprising:

[0005] Valve sleeve, having an inner cavity;

[0006] A valve body, fitted over the outside of the valve sleeve and having an internal cavity communicating with the inner cavity of the valve sleeve; and

[0007] A bypass pipeline is located outside the valve body and includes an upper bypass port and a lower bypass port that are axially spaced and connected to the inner cavity of the valve sleeve. The medium of the desuperheating and pressure reducing device can flow along the bypass pipeline through the inner cavity of the valve sleeve and the inner cavity of the valve body to preheat the valve body and the valve sleeve.

[0008] A discharge pipe is provided on the bypass pipeline and between the upper port and the lower port of the bypass, so that impurities in the inner cavity of the valve sleeve can be discharged along the discharge pipe.

[0009] In some embodiments, the bypass conduit includes:

[0010] The connector includes a first connector end, a second connector end, and a third connector end that are switchably connected in pairs;

[0011] The first valve downstream pipeline has one end forming the bypass upper port, and the other end connected to the first connector end;

[0012] The second valve downstream pipeline has one end forming the bypass lower port and the other end connected to the second connector end; and

[0013] One end of the discharge pipeline is connected to the third connector end.

[0014] In some embodiments, the first downstream pipeline, the second downstream pipeline, and the discharge pipeline are respectively provided with pipeline regulating components for adjusting the opening and closing of the pipeline.

[0015] In some embodiments, at least one perforated plate for pressure reduction is provided in the pipeline downstream of the second valve.

[0016] In some embodiments, the valve sleeve includes a pressure ring, a valve sleeve sleeve, and a valve sleeve seat arranged axially in sequence. The valve sleeve sleeve is provided with a valve sleeve inlet that connects the valve sleeve cavity with the bypass upper port. The valve sleeve seat is provided with a valve sleeve seat branch pipe that connects the valve sleeve cavity with the bypass lower port and extends out of the valve body.

[0017] In some embodiments, the valve sleeve includes an inner valve sleeve and an outer valve sleeve nested together. The inner valve sleeve has a plurality of inner through holes serving as the valve sleeve inlet, and the outer valve sleeve has a plurality of outer through holes serving as the valve sleeve inlet. The center of the inner through hole and the center of the outer through hole are staggered.

[0018] In some embodiments, the valve body includes:

[0019] A valve body housing surrounds and defines the inner cavity of the valve body;

[0020] The medium inlet is located on the peripheral wall of the valve body and communicates with the valve sleeve inlet; and

[0021] The medium outlet is located at the axial end of the valve body housing and communicates with the inner cavity of the valve body.

[0022] In some embodiments, the desuperheating and pressure reducing device further includes a valve core mechanism located within the valve sleeve cavity for regulating the medium flow path, the valve core mechanism dividing the valve sleeve cavity into a rod-type cavity and a rodless cavity, wherein the valve core mechanism includes:

[0023] The valve core is axially movable and connected to the inner cavity of the valve sleeve, and is provided with an inner cavity of the valve core, an outer annular groove of the valve core, a radial connecting channel of the valve core, and an axial connecting channel of the valve core. The axial connecting channel of the valve core connects the inner cavity of the valve core and the rod cavity, and the radial connecting channel of the valve core connects the inner cavity of the valve core and the outer annular groove of the valve core.

[0024] A valve stem is axially movable and connected to the inner cavity of the valve core, and includes a valve stem connecting end. The valve stem connecting end is provided with a valve stem connecting channel for connecting the inner cavity of the valve core and the rodless cavity.

[0025] In some embodiments, the valve stem connection channel includes:

[0026] A valve stem end groove is formed at the axial end of the valve stem connection end and communicates with the rodless cavity; and

[0027] A groove peripheral wall hole is formed radially through the peripheral wall of the groove at the valve stem end and serves to connect the groove at the valve stem end with the inner cavity of the valve core;

[0028] The groove peripheral wall holes are arranged axially and the hole width increases sequentially from the rod cavity side to the rodless cavity side.

[0029] In some embodiments, the de-cooling and pressure-reducing device further includes:

[0030] Valve cover, which is disposed on the valve body housing; and

[0031] The spray assembly includes a spray pipe surrounding the outside of the valve body, a plurality of sequentially connected spray branch pipes extending from the spray pipe, a nozzle seat, and a nozzle extending into the inner cavity of the valve body.

[0032] This invention provides a desuperheating and pressure reducing device, which includes a valve body, a valve sleeve, and a bypass pipeline. The bypass pipeline is connected to the valve sleeve, so that a portion of the bypass pipeline and a portion of the valve sleeve are connected in parallel. In this way, the desuperheating and pressure reducing device can be purged and cleaned, drained from the valve cavity, periodically drained from the valve cavity, and preheated after the valve through the bypass pipeline without disassembling the device. This saves costs, is easy to operate, significantly reduces construction time, and ensures the stable operation of the desuperheating and pressure reducing device.

[0033] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0034] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0035] Figure 1 This is a schematic diagram of the external structure of a de-cooling and pressure-reducing device according to a specific embodiment of the present invention;

[0036] Figure 2 for Figure 1 The schematic diagrams of the local structure from different perspectives illustrate the bypass pipeline;

[0037] Figure 3This is a schematic diagram of the internal structure of a de-cooling and pressure-reducing device according to a specific embodiment of the present invention;

[0038] Figure 4 for Figure 3 The partial structural diagram shows the valve core mechanism when the valve stem connection end is in the first axial movement position of the valve stem;

[0039] Figure 5 for Figure 3 The partial structural diagram shows the valve core mechanism, valve sleeve, and valve body when the valve stem connection end is in the first axial movement position of the valve stem;

[0040] Figure 6 for Figure 3 The schematic diagrams of the partial structure under different states show the valve core mechanism, valve sleeve, and valve body when the valve stem connection end is in the axial movement position of the third valve stem;

[0041] Figure 7 for Figure 3 A partial structural diagram showing the hole in the peripheral wall of the groove in its unfolded state;

[0042] Figure 8 for Figure 3 A partial structural diagram showing the valve cover;

[0043] Figure 9 for Figure 3 A partial structural diagram shows the valve body housing, pressure ring, and pressure ring fixing assembly;

[0044] Figure 10 for Figure 3 The partial structural diagram shows the valve body shell and valve seat.

[0045] Explanation of reference numerals in the attached figures

[0046] 810 Discharge Pipeline 820 Connector

[0047] 830 First valve downstream pipeline 840 Second valve downstream pipeline

[0048] 8201 First connector end 8202 Second connector end

[0049] 8203 Third connector terminal

[0050] 8501 First Pipeline Adjuster 8502 Second Pipeline Adjuster

[0051] 8503 Third Pipeline Adjustment Component 7 Orifice Plate

[0052] 101 Valve body cavity 102 Medium inlet

[0053] 103 Medium outlet 104 Valve body

[0054] 201 Valve sleeve inner cavity 202 Valve sleeve inlet

[0055] 203 Pressure ring, 204 Valve sleeve

[0056] 205 Valve seat 206 Valve seat opening

[0057] 207 Valve sleeve seat branch pipe

[0058] 2011 Rod-type cavity; 2012 Rodless cavity

[0059] 2021 Valve sleeve external through hole; 2022 Valve sleeve internal through hole

[0060] 2041 Inner sleeve of valve sleeve; 2042 Outer sleeve of valve sleeve

[0061] 2051 Valve sleeve seat ring; 2052 Valve sleeve seat base plate

[0062] 2053 Valve sleeve seat bottom hole; 2054 Valve sleeve seat sealing surface

[0063] 301 Valve core inner cavity; 302 Valve core radial connecting channel

[0064] 303 Axial connecting channel for valve core; 304 Valve core seat

[0065] 305 Valve core limiting block; 306 Valve core inner ring

[0066] 307 Valve core inner ring sealing structure; 308 Countersunk hole

[0067] 3071 Sealing ring; 3072 Valve core inner ring sealing ring.

[0068] 3073 Valve core inner ring sealing ring; 3074 Disc spring

[0069] 3021 External through hole of valve core; 3022 Internal through hole of valve core

[0070] 401 Valve stem connection end; 402 Valve stem connection channel

[0071] 403 Valve stem piston section; 404 Valve stem piston connecting passage

[0072] 405 Valve stem extension end

[0073] 4021 Valve stem end groove; 4022 Groove peripheral wall hole

[0074] 40221 First groove peripheral wall hole; 40222 Second groove peripheral wall hole

[0075] 402211 Upper hole on the peripheral wall of the first groove; 402212 Lower hole on the peripheral wall of the first groove

[0076] 402213 First Conical Section 402221 Second Conical Section

[0077] 710 nozzle, 720 spray pipe

[0078] 730 Sprinkler Head Mount, 740 Sprinkler Branch Pipe

[0079] 4. Elastic components

[0080] 41 Pressure ring 42 Spring

[0081] 51 First valve cover 52 Second valve cover

[0082] 53 Valve cover pressure ring 54 Valve cover pressure plate

[0083] 55 Valve cover sealing ring

[0084] 6. Pressure ring fixing assembly

[0085] 61 Third fixing part of the pressure ring 62 First fastener of the pressure ring

[0086] 63 Second fastener for pressure ring 64 Second fixing part for pressure ring

[0087] 65 First fixing part of the pressure ring; 66 Screw hole Detailed Implementation

[0088] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0089] The desuperheating and pressure reducing device according to the present invention is described below with reference to the accompanying drawings. This device facilitates sewage discharge and can preheat the valve sleeve and valve body, effectively protecting the valve core mechanism and ensuring the stable operation of the desuperheating and pressure reducing device.

[0090] First, it should be noted that there are many welded structures at pipeline installation sites, resulting in a large amount of welding slag, rust, and even iron filings inside the pipeline after installation. However, valve internals are labyrinthine in design, with small flow channels and many bends, making them unsuitable for purging and cleaning. In practice, valves unsuitable for purging are disassembled, a spurious internal structure is installed, and the actual internals are reinstalled after purging. However, for particularly important valves, disassembly and installation are inherently very difficult. Reinstallation after disassembly is not only costly but also unreliable in quality because online testing and verification are impossible. In some cases, the purging process is neglected or incomplete for various reasons, resulting in continuous failures of pipeline system components. Disassembly and inspection reveal prominent issues such as weld slag blockages and surface scratches on components.

[0091] Based on this, the present invention discloses a desuperheating and pressure reducing device. Before leaving the factory, the desuperheating and pressure reducing device is cleaned of welding slag and impurities. However, with the use of the desuperheating and pressure reducing device, welding slag is easily generated after welding of the device and pipeline equipment components, and impurities are easily generated during operation. It is difficult to quickly and conveniently discharge impurities from the pipeline network, and sudden heating of the desuperheating and pressure reducing device in a cold state can easily cause valve jamming. Therefore, how to preheat and remove impurities from the desuperheating and pressure reducing device is a problem worthy of research.

[0092] Therefore, refer to Figures 1 to 10 As shown, in order to achieve the impurity removal and preheating performance of the desuperheating and pressure reducing device, the inventor of this application provides a desuperheating and pressure reducing device, which includes: a valve sleeve, a valve body and a bypass pipeline;

[0093] Specifically, the valve sleeve has an inner cavity 201, such as... Figure 3 and Figure 5 As shown, it is a sleeve-shaped structure, including a valve sleeve housing and a valve sleeve inner cavity 201 defined by the valve sleeve housing. The valve sleeve inner cavity 201 of the desuperheater and pressure reducer needs to be equipped with a valve core mechanism. Therefore, its valve sleeve inner cavity 201 may include multiple valve sleeve inner cavity segments.

[0094] The valve body, sleeved on the outside of the valve sleeve, has an inner cavity 101 that communicates with the inner cavity 201 of the valve sleeve, such as... Figure 3 and Figure 5 As shown, the valve body includes a valve body housing 104 and a valve body inner cavity 101 defined by the valve body housing 104. A valve sleeve housing is fitted inside the valve body housing 104. The valve sleeve inner cavity 201 is located in the upper inner part of the valve body inner cavity 101, forming an interconnected valve sleeve inner cavity 201 and valve body inner cavity 101, so that the medium can flow through the valve sleeve inner cavity 201 and valve body inner cavity 101 sequentially; and

[0095] The bypass pipeline, located outside the valve body, includes an upper bypass port and a lower bypass port that are axially spaced and communicate with the valve sleeve cavity 201, such as... Figure 1 , Figure 2 and Figure 3 As shown, the bypass pipeline can be connected to the valve sleeve cavity 201 through the bypass upper port and the bypass lower port. Since the valve sleeve cavity 201 and the valve body cavity 101 are connected, it can be understood that the bypass pipeline and a part of the valve sleeve cavity 201 are connected in parallel. In this way, the desuperheating and pressure reducing device can be purged and cleaned without disassembly, and the medium in the desuperheating and pressure reducing device can flow through the valve sleeve cavity 201 and the valve body cavity 101 along the bypass pipeline to preheat the valve body and valve sleeve.

[0096] Optionally, the bypass pipeline can be one or multiple. Taking multiple bypass pipelines as an example, the multiple bypass pipelines can be distributed circumferentially along the valve body housing 104 to increase the flow rate per unit time. Each bypass pipeline can have one or more bypass upper ports and bypass lower ports, thus forming external connection passages at different pipe sections, facilitating flexible adjustment of the preheating space of the bypass pipeline. In addition, the bypass pipeline can optionally be supported and fixed by brackets provided on the peripheral wall of the valve body housing 104, or by brackets extending from the ground or mounting platform; no specific limitation is made here.

[0097] Furthermore, a discharge pipe 810 is provided on the bypass pipeline, located between the upper bypass port and the lower bypass port, so that impurities in the valve sleeve cavity 201 can be discharged along the discharge pipe 810. In one embodiment, the bypass pipeline includes an upper bypass port and a lower bypass port, such as... Figure 2 As shown, the bypass upper port and the bypass lower port are connected by a bypass connecting pipe, and the discharge pipe 810 is connected to the bypass connecting pipe. In this way, the medium or impurities in the valve sleeve cavity 201 can be discharged along the discharge pipe 810 after entering the bypass connecting pipe, so that the desuperheater and pressure reducer has a sewage discharge function.

[0098] Furthermore, in order to achieve switchable shut-off or connection of multiple pipe segments, a bypass pipeline is designed. In one embodiment, the bypass pipeline includes: a connector 820, a first downstream pipeline 830, a second downstream pipeline 840, and a discharge pipeline 810.

[0099] Specifically, connector 820 includes a first connector end 8201, a second connector end 8202, and a third connector end 8203 that are switchably connected in pairs; a first downstream pipeline 830, one end of which is formed as a bypass upper port and the other end is connected to the first connector end 8201; a second downstream pipeline 840, one end of which is formed as a bypass lower port and the other end is connected to the second connector end 8202; and a discharge pipeline 810, one end of which is connected to the third connector end 8203. The connection and disconnection of each pipeline can be adjusted through connector 820, or adjusting elements can be respectively installed on the first downstream pipeline 830, the second downstream pipeline 840, and the discharge pipeline 810 to adjust the opening and closing of the pipelines.

[0100] Preferably, in one embodiment, the connector can be a three-way valve (not shown in the figure) having a first connector end 8201, a second connector end 8202 and a third connector end 8203. In this way, by adjusting the three-way valve, the first valve downstream pipeline 830, the second valve downstream pipeline 840 and the discharge pipeline 810 can be switched to be connected in pairs to switch between preheating the valve body and the valve sleeve, or draining the valve sleeve inner cavity 201. The structure is simple and easy to operate.

[0101] In another embodiment, the first downstream pipeline 830, the second downstream pipeline 840, and the discharge pipeline 810 are respectively provided with pipeline regulating components for adjusting the opening and closing of the pipelines. These pipeline regulating components may include a first pipeline regulating component 8501 provided on the first downstream pipeline 830, a second pipeline regulating component 8502 provided on the second downstream pipeline 840, and a third pipeline regulating component 8503 provided on the discharge pipeline 810. Figure 2 As shown. In this way, each pipeline can be controlled independently. Opening any two pipeline regulating components can realize the two-way switching of the corresponding pipeline, so as to switch between preheating valve body and valve sleeve, or draining sewage in valve sleeve cavity 201.

[0102] Furthermore, at least one perforated plate 7 for pressure reduction is provided within the pipeline 840 downstream of the second valve. Specifically, in one embodiment, as... Figure 2 As shown, a perforated plate 7 is respectively provided on the pipe section of the second downstream pipeline 840 and at both ends of the second pipeline regulating member 8502. Optionally, the holes of the perforated plate are circular to reduce pressure and prevent impurities from entering the second downstream pipeline 840. After being blocked by the perforated plate 7, the impurities are discharged through the drain port of the discharge pipeline 810. Similarly, the perforated plate 7 can also reduce pressure, making the flow of preheated steam more stable. Of course, in other embodiments of the present invention, the holes can be any shape other than circular, and the present invention does not further limit this.

[0103] For a valve sleeve, in one embodiment, the valve sleeve includes a pressure ring 203, a valve sleeve 204, and a valve sleeve seat 205 arranged axially in sequence. The valve sleeve 204 is provided with a valve sleeve inlet 202 that connects the valve sleeve inner cavity 201 with the bypass upper port. The valve sleeve seat 205 is provided with a valve sleeve seat branch pipe 207 that connects the valve sleeve inner cavity 201 with the bypass lower port and extends out of the valve body. Figure 3 As shown, an upper valve body port for connecting to the bypass upper port is provided on the pipe wall of the valve body housing 104 at a radial position located at the valve sleeve inlet 202, thereby realizing the connection between the valve sleeve inner cavity 201, the valve sleeve inlet 202, the upper valve body port, and the bypass upper port; a lower valve body port for passing through the valve sleeve seat branch pipe 207 is provided on the pipe wall of the valve body housing 104 at a radial position located at the valve sleeve seat 205, thereby realizing the connection between the valve sleeve seat 205, the valve sleeve seat branch pipe 207, and the bypass lower port.

[0104] Furthermore, on the one hand, the valve body cavity 101 and the valve sleeve cavity 201 can be connected through the valve seat 205. Optionally, the valve seat 205 may include a valve seat ring 2051 and a valve seat base plate 2052 located at the axial bottom end of the valve seat ring 2051. A valve seat opening 206 is provided on the peripheral wall surface of the valve seat ring 2051, and a valve seat bottom hole 2053 is provided on the valve seat base plate 2052. Figure 10 As shown, the valve body cavity 101 and the valve sleeve cavity 201 are connected through the valve sleeve seat opening 206 and the valve sleeve seat bottom hole 2053, so that the medium flows through the valve sleeve cavity 201 and the valve body cavity 101 in sequence.

[0105] On the other hand, in order to reduce the medium pressure, the valve sleeve 204 and the valve sleeve inlet 202 are designed. In one embodiment, the valve sleeve 204 includes an inner valve sleeve 2041 and an outer valve sleeve 2042 nested together. The inner valve sleeve 2041 is provided with a plurality of inner valve sleeve through holes 2022 serving as valve sleeve inlets, and the outer valve sleeve 2042 is provided with a plurality of outer valve sleeve through holes 2021 serving as valve sleeve inlets. The center of the inner valve sleeve through holes 2022 and the center of the outer valve sleeve through holes 2021 are staggered. Figure 5 and Figure 6 As shown, the center of the outer through hole 2021 of the valve sleeve is not coaxial with the center of the inner through hole 2022 of the valve sleeve, thereby achieving a gradual decrease in medium pressure. The pressure decrease is smooth and uniform, and the valve sleeve 204 is subjected to uniform force in the circumferential direction, reducing the stress on one side and avoiding vibration of the valve core mechanism and pipeline caused by sudden pressure drop. This also reduces the scouring of the valve core mechanism by high-pressure medium, prevents the valve sleeve 204 from being damaged and detached by the medium, and also reduces noise.

[0106] Meanwhile, regarding the valve body, in one embodiment, the valve body includes: a valve body housing 104 surrounding and defining a valve body inner cavity 101; a medium inlet 102 located on the peripheral wall surface of the valve body housing 104 and communicating with the valve sleeve inlet; and a medium outlet 103 located at the axial end of the valve body housing and communicating with the valve body inner cavity 101, such as... Figure 3 As shown. In this way, the medium can enter the valve sleeve cavity 201 sequentially from the medium inlet 102 and the valve sleeve inlet 202, and then be discharged sequentially along the valve body cavity 101 and the medium outlet 103.

[0107] For a desuperheating and pressure reducing device, the valve core mechanism is an important internal component. Therefore, the valve core mechanism is designed. In one embodiment, the desuperheating and pressure reducing device also includes a valve core mechanism located in the inner cavity 201 of the valve sleeve for regulating the flow path of the medium. The valve core mechanism divides the inner cavity 201 of the valve sleeve into a rod-type cavity 2011 and a rodless cavity 2012. The valve core mechanism includes a valve core and a valve stem.

[0108] Specifically, the valve core is axially movable and connected to the inner cavity 201 of the valve sleeve, and is provided with an inner cavity 301, an outer annular groove, a radial connecting channel 302, and an axial connecting channel 303. Figure 3 and Figure 4 As shown, the valve core, as an important internal component of the desuperheating and pressure reducing device, has an overall sleeve-like structure and is embedded in the valve sleeve, dividing the valve sleeve into a rod-side cavity 2011 and a rodless cavity 2012 on the other side. The valve core inner cavity 301 can be located radially inside the sleeve, and the valve core outer annular groove is located radially outside the valve core inner cavity 301. The valve core axial connecting channel 303 and the valve core radial connecting channel 302 are both located on the sleeve. The valve core axial connecting channel 303 connects the valve core inner cavity 301 and the rod-side cavity 2011, and the valve core radial connecting channel 302 connects the valve core inner cavity 301 and the valve core outer annular groove.

[0109] A valve stem is axially movable and connected to the valve core cavity 301, and includes a valve stem connecting end 401. The valve stem connecting end 401 is provided with a valve stem connecting channel 402 for communicating between the valve core cavity 301 and the rodless cavity 2012. The valve stem connecting end 401 includes a first valve stem axial movement position, a second valve stem axial movement position, and a third valve stem axial movement position; for example... Figure 1 and Figure 2 As shown, the valve stem includes a valve stem connecting end 401 located within the valve core cavity 301 and a valve stem extension end 405 extending out of the valve core cavity 301, as... Figure 3 As shown, the valve stem extension end 405 is located in the rod chamber 2011, and the valve stem can move axially, thereby driving the valve core to adjust its axial position.

[0110] On the one hand, there is a certain lead difference between the valve core and the valve stem, which can be understood as the valve stem having a lead difference within the valve core. Figure 5 The first valve stem axial movement position shown, and as... Figure 6The second valve stem axial movement position is shown. In the first valve stem axial movement position, both the valve core radial connecting channel 302 and the valve stem connecting channel 402 are closed. In the second valve stem axial movement position, the valve core radial connecting channel 302 is closed and the valve stem connecting channel 402 is open. In the third valve stem axial movement position, both the valve core radial connecting channel 302 and the valve stem connecting channel 402 are open. In the first valve stem axial movement position, the valve core axial connecting channel 303 is always connected to the rod chamber 2011 to depressurize the medium in the rod chamber 2011 into the valve core inner cavity 301. As the valve stem moves from the first valve stem axial movement position to the second valve stem axial movement position, the valve stem connecting channel 402 gradually opens to drain the medium entering the valve core inner cavity into the rodless chamber 2012, thereby achieving the connection between the rod chamber 2011 and the rodless chamber 2012. As the valve stem moves from the second valve stem axial movement position to the third valve stem axial movement position, the radial connecting channel 302 of the valve core gradually opens, thereby increasing the flow rate of the rod chamber 2011 and the rodless chamber 2012.

[0111] It should be noted that in the desuperheater and pressure reducer, the valve sleeve inner cavity 201 may include a rod-shaped cavity 2011, a valve core outer annular groove, and a rodless cavity 2012 at the lower axial end of the valve core, arranged sequentially in the axial direction. The rodless cavity 2012 is connected to the valve body inner cavity 101, allowing the medium in the rodless cavity 2012 to be discharged sequentially along the valve body inner cavity 101 and the medium outlet 103. For example... Figure 3 As shown, the valve sleeve inner cavity 201 can be understood as a straight inner cavity, wherein the end where the valve stem is located is the rod cavity 2011, the position where the valve core is located is the valve core outer annular groove, and the position of the lower axial end of the valve core is the rodless cavity 2012. The upper axial end face of the valve sleeve seat ring 2051 forms the valve sleeve seat sealing surface 2054. Figure 10 As shown, when the valve core is in the first axially moving position, the valve core abuts against the valve sleeve seat sealing surface 2054 to seal the valve sleeve inlet 202.

[0112] The valve core may include a valve core seat 304, which surrounds and defines a valve core inner cavity 301. A valve core limiting block 305 is provided at the top of the inner cavity of the valve core seat 304. It can be understood that the valve core can be in the form of a gate-shaped sleeve structure. The valve core axial connecting channel 303 can be provided through the wall surface of the valve core limiting block 305, or it can be a gap ring formed between the valve core limiting block 305 and the peripheral wall surface of the valve stem.

[0113] Optionally, the valve core axial connecting channel 303 can be a connecting channel arranged axially and parallel to the valve stem, or it can be arranged at a certain inclination angle along the axial direction. In addition, the valve core axial connecting channel 303 can have the same inner diameter at all points along the axial direction, or it can have different inner diameters at all points along the axial direction. For example, a funnel-shaped connecting channel with a larger inner diameter at the upper end and a smaller inner diameter at the lower end along the axial direction is not specifically limited here.

[0114] Furthermore, in order to enable linkage between the valve core and the valve stem, the valve stem connecting end 401 is provided with a valve stem piston portion 403 that forms a piston-like engagement with the valve core inner cavity 301, and the valve stem piston portion 403 is provided with an axially penetrating valve stem piston connecting channel 404. This can be understood as, for example... Figure 4 and Figure 6 As shown, there is a certain gap between the valve stem piston portion 403 and the valve core limiting block 305, and a certain lead difference exists between the valve stem and the valve core, allowing the valve stem connecting end 401 to switch between a first valve stem axial movement position and a second valve stem axial movement position. The valve stem piston connecting channel 404 is always connected to the valve core axial connecting channel 303, used to guide the medium from the upper axial part of the valve stem piston portion 403 to the lower axial part of the valve stem piston portion 403. Optionally, the valve stem connecting end 401 can be an integral structure with the valve stem piston portion 403, or the valve stem piston portion 403 can be fixedly sleeved on the outer peripheral wall of the valve stem connecting end 401; no specific limitation is made here.

[0115] Furthermore, to achieve the linkage adjustment between the valve core and the valve stem, in one embodiment, the valve core inner cavity 301 is provided with an elastic element 4 for pushing the valve core towards the rodless cavity 2012 with elastic bias. It can be understood that the inner peripheral wall of the valve core seat 304 has an irregular structure, and a countersunk hole 308 is formed on the inner peripheral wall of the valve core seat 304, which is opposite to the valve stem piston portion 403. There is a certain installation space between the countersunk hole 308 and the valve stem piston portion 403. An elastic element 4 is provided within this installation space. The elastic element 4 may include a spring 42 extending from the countersunk hole 308 and a pressure ring 41 abutting against the lower peripheral wall of the valve stem piston portion 403. Preferably, the spring 42 can be a butterfly spring. The elastic deformation of the butterfly spring allows the valve stem piston portion 403 to move a specified stroke. The stroke distance depends on the deformation of the butterfly spring after its recovery deformation, such as... Figure 4 As shown, during the deformation of the disc spring, one end of the valve stem piston 403 moves, causing the valve stem connecting channel 402 to gradually connect with the valve core inner cavity 301, the valve core axial connecting channel 303, and the valve stem piston connecting channel 404, so as to realize the fine adjustment of flow rate and small flow rate regulation.

[0116] To achieve the cut-off and conduction of the rod chamber 2011, the valve core cavity 301, and the rodless chamber 2012, the structure of the valve stem connecting channel 402 is designed. In one embodiment, the valve stem connecting channel 402 includes: a valve stem end groove 4021, formed at the axial end of the valve stem connecting end 401 and communicating with the rodless chamber 2012; and a groove peripheral wall hole 4022, formed radially through the peripheral wall of the valve stem end groove 4021 and used to connect the valve stem end groove 4021 with the valve core cavity 301.

[0117] like Figure 5 and Figure 6 As shown, the valve stem connection end 401 can be understood as including a connection end body and a sleeve part arranged axially in sequence. A groove peripheral wall hole 4022, which serves as the medium inlet end, is opened on the peripheral wall surface of the sleeve part. The inner cavity of the sleeve part is formed as a valve stem end groove 4021, which serves as the medium outlet end. In this way, the groove peripheral wall hole 4022 is set on the peripheral wall surface of the sleeve part that can fit with the valve core seat 304. Since the diameter of the inner peripheral wall of the valve core seat 304 is different at different axial positions, the groove peripheral wall hole 4022 can switch from closed, gradually open to fully open state to realize the adjustment of the medium flow rate.

[0118] Furthermore, regarding the groove peripheral wall hole 4022, in one embodiment, the groove peripheral wall hole 4022 includes a first groove peripheral wall hole 40221 and a second groove peripheral wall hole 40222 arranged circumferentially spaced and having different heights. For example... Figure 6 and Figure 7 As shown, the first groove peripheral wall hole 40221 can be understood as including a first groove peripheral wall upper hole 402211 and a first groove peripheral wall lower hole 402212 arranged axially in sequence. The first groove peripheral wall hole 40221 and the second groove peripheral wall hole 40222 have different heights. Thus, from the overall perspective of the groove peripheral wall hole 4022, as the valve stem connecting end 401 moves upward, the first groove peripheral wall upper hole 402211 first opens, and then the first groove peripheral wall lower hole 402212 and the second groove peripheral wall hole 40222 open simultaneously. This results in different medium flow areas in the valve stem connecting channel 402 at different axial positions of the valve stem connecting end 401, thereby regulating the flow rate of the valve core mechanism.

[0119] Furthermore, in one embodiment, the groove peripheral wall hole 4022 extends axially and its width increases sequentially from the rod-side cavity 2011 to the rodless-side cavity 2012. This can be understood as the first groove peripheral wall hole 40221 and the second groove peripheral wall hole 40222 both extending axially and their widths increasing sequentially from the rod-side cavity 2011 to the rodless-side cavity 2012. From a local angle, taking the first groove peripheral wall hole 40221 as an example, as the valve stem connection end 401 moves upward, the width of the first groove peripheral wall hole 40221 increases, thereby increasing the medium flow area of ​​each first groove peripheral wall hole 40221 to achieve adjustment from small to large flow rates. Preferably, in one embodiment, such as... Figure 7As shown. The lower hole 402212 of the first groove peripheral wall further includes a first conical section 402213 and a first straight section, and the second groove peripheral wall hole 40222 includes a second conical section 402221 and a second straight section. It can be understood that, taking the second groove peripheral wall hole 40222 as an example, the hole width of the second conical section 402221 increases in the circumferential direction, while the hole width of the second straight section is the same in the axial direction. In this way, the flow rate can be adjusted through the second conical section 402221, and the groove peripheral wall holes 4022 are conveniently arranged in a concentrated manner, which increases the effective hole area of ​​the groove peripheral wall holes 4022 on the valve stem connection end 401.

[0120] To achieve a gradual decrease in medium pressure, the radial connecting channel 302 of the valve core is designed radially. In one embodiment, the radial connecting channel 302 includes an outer through hole 3021 and an inner through hole 3022 formed radially through the peripheral wall of the valve core. The outer through hole 3021 and the inner through hole 3022 are connected and their centers are staggered. This can be understood as the outer through hole 3021 and the inner through hole 3022 being arranged sequentially along the radial direction of the valve core. There can be multiple outer through holes 3021 and 3022. Taking the outer through hole 3021 as an example, multiple outer through hole rings can be arranged at intervals along the axial direction of the valve core. Each outer through hole ring can include multiple outer through holes 3021 arranged at intervals along the circumference of the valve core. In this way, the medium located in the outer annular groove of the valve core can enter the inner cavity 301 of the valve core sequentially through the outer through hole 3021 and the inner through hole 3022 of the valve core, and the center of each outer through hole 3021 and the center of each inner through hole 3022 of the valve core are not coaxial, thereby realizing the gradual decrease of the medium pressure.

[0121] Optionally, in one embodiment, the outer through hole 3021 and the inner through hole 3022 of the valve core can both be disposed on the valve core seat 304, and are arranged radially spaced and interconnected on the peripheral wall of the valve core seat 304. In another embodiment, an inner valve core ring 306 can be disposed inside the valve core seat 304. In this case, the outer through hole 3021 and the inner through hole 3022 of the valve core can be disposed on the valve core seat 304 and the inner valve core ring 306 respectively, which facilitates processing and saves costs.

[0122] Furthermore, to ensure the sealing between the valve core inner ring 306 and the valve core seat 304, a sealing structure can be provided between the valve core seat 304 and the valve core inner ring 306, such as... Figure 4 and Figure 5As shown. The sealing structure may include a sealing pressure ring located at one axial end of the valve core inner ring 306, and a valve core inner ring sealing structure 307 located at the other axial end of the valve core inner ring 306. The valve core inner ring sealing structure 307 may include a sealing pressure ring 3071 located at one axial end of the valve core inner ring 306 and embedded in the valve core seat 304, and a valve core inner ring 306 located on the other axial side and sandwiched between the valve core inner ring 306 and the valve core seat 304. The valve core inner ring is sealed with an upper ring 3072, which is pressed by the valve core inner ring sealing middle ring 3073 at its lower axial end. A butterfly spring 3074 is provided between the lower axial end of the valve core inner ring sealing middle ring 3073 and the valve core inner ring 306. The lower axial end of the valve core inner ring sealing middle ring 3073 is pressed and fixed in the valve core seat 304 by the valve core seat retaining ring, so that the valve core inner ring 306 is always sealed inside the valve core seat 304.

[0123] On the other hand, the valve core is axially movable within the valve sleeve cavity 201 and includes a first axially movable valve core position and a second axially movable valve core position. In the first axially movable valve core position, the valve sleeve inlet 202 is closed to the rodless chamber 2012. In the second axially movable valve core position, the valve sleeve inlet 202 is connected to the rodless chamber 2012. In the first axially movable valve core position, as... Figure 5 As shown, when the second valve core is in the axial moving position, as Figure 6 As shown, as the valve core moves from the first axial movement position to the second axial movement position, the valve sleeve inlet 202 gradually connects with the rodless chamber 2012 to achieve a large flow of medium.

[0124] Optionally, to ensure the ease of replacement and maintainability of the valve core mechanism, the pressure ring 203, valve sleeve 204, and valve seat 205 are connected to form an integral structure. To ensure sealing, a sealing element can be provided at the connection between the pressure ring 203 and the valve sleeve 204, and also at the connection between the valve sleeve 204 and the valve seat 205. Of course, in other embodiments of the present invention, the pressure ring 203, valve sleeve 204, and valve seat 205 can also be detachably connected.

[0125] In addition, in one embodiment, the de-cooling and pressure-reducing device further includes: a valve cover and a spray assembly;

[0126] Specifically, the valve cover is disposed on the valve body housing 104; and the spray assembly includes a spray pipe 720 surrounding the outside of the valve body, a plurality of sequentially connected spray branch pipes 740 extending from the spray pipe 720, a nozzle seat 730, and a nozzle 710 extending into the inner cavity 101 of the valve body.

[0127] On the one hand, the valve body also includes a valve cover located at the end of the valve body housing 104, which may include a first valve cover 51 and a second valve cover 52, such as Figure 8 As shown, the first valve cover 51 is partially fixed to the valve body housing 104 by at least one screw. The second valve cover 52 is also fixedly connected to the first valve cover 51 by at least one screw. A self-sealing assembly is provided between the lower axial end of the second valve cover 52 and the inner cavity 101 of the valve body. The self-sealing assembly includes a valve cover pressure ring 53, a valve cover pressure plate 54, and a valve cover sealing ring 55. The valve cover pressure ring 53 is sleeved on the lower end of the outer peripheral wall of the first valve cover 51, and the valve cover sealing ring 55 is sleeved on the upper end of the outer peripheral wall of the second valve cover 52. The valve cover pressure ring 53 is pressed by the first valve cover 51 and abuts against the groove formed at the top of the inner peripheral wall of the valve body housing 104. The valve cover pressure ring 53 is connected to the valve cover pressure plate 54 by fasteners to press the valve cover sealing ring 55, thereby achieving a seal between the first valve cover 51 and the second valve cover 52, and between the second valve cover 52 and the valve body housing 104. Among them, the self-sealing component has a better sealing effect when the medium pressure is higher, effectively saving installation space, and avoiding leakage caused by stress relaxation that is common in traditional bolt and gasket structures under high temperature and high pressure conditions.

[0128] Optionally, to avoid loosening caused by thermal expansion and contraction of the desuperheater and to eliminate loosening problems during operation, and to simplify the assembly process and save costs, a pressure ring fixing assembly 6 is provided between the valve body housing 104 and the pressure ring 203. For example... Figure 9 and Figure 10 As shown.

[0129] Specifically, the pressure ring fixing assembly 6 includes a pressure ring third fixing part 61, a pressure ring first fastener 62, a pressure ring second fastener 63, a pressure ring second fixing part 64, a pressure ring first fixing part 65, and a screw hole 66.

[0130] In the desuperheater of Embodiment 1 of the present invention, the first fixing part 65 of the pressure ring is connected to the first fixing part 62 of the pressure ring by the second fixing part 64 of the pressure ring. The first fixing part 65 of the pressure ring can be a retaining ring, and the second fixing part 64 of the pressure ring can be a quarter ring. A portion of the quarter ring is embedded in a groove (not marked in the figure) on the inner side of the valve body housing 104. The upper axial end of the third fixing part 61 of the pressure ring has an external thread that is threaded to the first fixing part 65 of the pressure ring. Another part of the third fixing part 61 of the pressure ring is connected to the lower end of the first fixing part 62 of the pressure ring by the second fixing part 63 of the pressure ring. Preferably, the third fixing part 61 of the pressure ring is an anti-loosening ring, the first fixing part 62 of the pressure ring is an anti-loosening screw, and the second fixing part 63 of the pressure ring is a tightening screw.

[0131] During installation, multiple threaded holes are formed on the first fixing part 65 of the pressure ring along the circumferential direction, and multiple through holes corresponding to the number and position of the aforementioned threaded holes are formed on the second fixing part 64 of the pressure ring. Then, the first fixing part 65 and the second fixing part 64 of the pressure ring are aligned and fixed using the second fastener 63 of the pressure ring. At this time, the second fastener 63 of the pressure ring is not treated to prevent loosening. The distal end of the third fixing part 61 of the pressure ring is threaded into the inner diameter of the first fixing part 65 of the pressure ring. The proximal end of the third fixing part 61 of the pressure ring has a flanged flange with multiple screw holes 66. Figure 9 and Figure 10 As shown, the center of some screw holes 66 is close to the center of the near end of the second fastener 63 of the pressure ring, so that the lower end of some first fasteners 62 of the pressure ring installed in the screw holes 66 can abut against the upper end of the second fastener 63 of the pressure ring. That is, the anti-loosening screw can always abut against the head of the clamping screw, ensuring that the second fastener 63 of the pressure ring cannot be retracted and its position is always fixed. The gap between the second valve cover 52 and the upper end of the third fixing part 61 of the pressure ring is less than the thread depth of the first fastener 62 of the pressure ring, i.e., the anti-loosening screw. The second valve cover 52 ensures that the first fastener 62 of the pressure ring cannot be dislodged. The third fixing part 61 of the pressure ring and the first fixing part 65 of the pressure ring combine to form a closed-loop locking. At the same time, the first fastener 62 of the pressure ring always bears the clamping force, effectively avoiding the loosening problem caused by thermal expansion and contraction. Moreover, the assembly method of the above-mentioned pressure ring fixing component 6 is simple and quick, and the size of the second valve cover 52 can be the same as the size of the pressure ring 203, so as to save costs.

[0132] On the other hand, in one embodiment, the desuperheater and pressure reducer further includes a spray assembly for spraying liquid into the valve body cavity 101. The spray assembly includes a spray pipe 720 surrounding the valve body, a plurality of sequentially connected spray branch pipes 740 extending from the spray pipe 720, a nozzle seat 730, and a nozzle 710 extending into the valve body cavity 101. Figure 1 and Figure 10 As shown. Cooling water is sprayed into the valve body cavity 101 through the spray assembly. Multiple nozzles 710 can be distributed circumferentially along the valve body cavity 101 to ensure effective cooling of the valve body cavity 101.

[0133] In summary, the present invention provides a valve core mechanism and a desuperheating and pressure reducing device. The desuperheating and pressure reducing device has a simple structure, low operating and maintenance costs, and flow regulation function. It can gradually perform micro-adjustment, small flow rate adjustment and large flow rate adjustment to achieve a large adjustable ratio and has wide applicability.

[0134] The functions that bypass pipelines can achieve are as follows, please refer to them. Figure 2 and Figure 3 :

[0135] Purging and cleaning: In the initial state, the first pipeline regulating component 8501, the second pipeline regulating component 8502, and the third pipeline regulating component 8503 are all closed. Open the third pipeline regulating component 8503 and the first pipeline regulating component 8501 so that the first downstream pipeline 830 is connected to the discharge pipeline 810. At this time, the pressure in the valve sleeve cavity 201 causes compressed gas to enter the first downstream pipeline 830 through the bypass upper port and purge from the drain port of the discharge pipeline 810. After purging is completed, close the third pipeline regulating component 8503 and the first pipeline regulating component 8501.

[0136] Valve cavity drainage: In the initial state, the first pipeline regulating component 8501, the second pipeline regulating component 8502, and the third pipeline regulating component 8503 are all closed. When the third pipeline regulating component 8503 and the first pipeline regulating component 8501 are opened, since the discharge pipeline 810 is located at the lowest part of the bypass pipeline, under the pressure of the valve sleeve cavity 201, all possible condensate and steam that has not reached the required temperature will enter the first valve downstream pipeline 830 through the bypass upper port and collect at the discharge pipeline 810. After the third pipeline regulating component 8503 is opened, it will be discharged along the drain port, effectively protecting the valve internals and pipelines.

[0137] Periodic drainage of the valve cavity: In the initial state, the first pipeline regulating component 8501, the second pipeline regulating component 8502, and the third pipeline regulating component 8503 are all closed. When the third pipeline regulating component 8503 and the first pipeline regulating component 8501 are opened, under the pressure of the valve sleeve cavity 201, the steam that has not reached the required temperature causes impurities, rust, iron filings, welding slag, etc. in the medium to enter the first valve downstream pipeline 830 from the bypass port and be discharged from the drain port of the discharge pipeline 810, so that solid impurities are effectively removed and the stable operation of the system is guaranteed.

[0138] Post-valve preheating: In the initial state, the first pipeline regulating component 8501, the second pipeline regulating component 8502, and the third pipeline regulating component 8503 are all closed. Before the desuperheating and pressure reducing device is opened, in order to preheat the valve body and valve sleeve, the first pipeline regulating component 8501 and the second pipeline regulating component 8502 are opened, so that the first post-valve pipeline 830 and the second post-valve pipeline 840 can be connected. Superheated steam flows out of the valve body shell 104 through the bypass upper port, and flows sequentially through the first post-valve pipeline 830, the second post-valve pipeline 840, the bypass valve sleeve seat branch pipe 207, and the rodless chamber 2012 and enters the valve body cavity 101, thereby preheating the valve sleeve seat 205 and the valve body cavity 101, preventing the desuperheating and pressure reducing device from suddenly heating up and jamming in a cold state, reducing the generation of condensate, effectively protecting the valve core mechanism, and preventing stress damage caused by drastic temperature rise as the valve core mechanism gradually heats up.

[0139] When the pressures before and after the valve are balanced, in the initial state, the first pipeline regulating component 8501, the second pipeline regulating component 8502, and the third pipeline regulating component 8503 are all closed. Opening the first pipeline regulating component 8501 and the second pipeline regulating component 8502 and appropriately adjusting their opening degrees can adjust the pressure in the rod chamber 2011 and the rodless chamber 2012, thereby reducing the pressure difference on both sides of the valve core, effectively reducing the actuator thrust, and enhancing the valve regulation accuracy.

[0140] The discharge pipe 810 can serve as a reserved interface for the system. When steam needs to be drawn from the system, whether it is high pressure or low pressure, there is no need to open a hole in the main pipe of the desuperheater and pressure reducer. It can be drawn out online by connecting it through a flange at the discharge pipe 810 or by opening the first pipe regulating component 8501 or the second pipe regulating component 8502, which provides convenience for later system modification.

[0141] In summary, without disassembling the desuperheater and pressure reducer, it is possible to purge and clean the desuperheater and pressure reducer, drain the valve cavity, periodically drain the valve cavity, preheat the valve, and balance the pressure before and after the valve.

[0142] Furthermore, the working process of the desuperheater and pressure reducer is as follows:

[0143] A1: First, describe the sequence of actions from valve core closing to opening. Initially, the valve stem is in the first axial movement position, and the valve core is in the first axial movement position. Figure 2 and Figure 3 As shown, primary steam enters from the medium inlet 102 and sequentially passes through the outer through-hole 2021 and inner through-hole 2022 of the valve sleeve 204, achieving a step-by-step pressure reduction of the primary steam. When the pressure-reduced primary steam enters the inner cavity 201 of the valve sleeve, i.e., the outer annular groove of the valve core, due to the gap between the valve core and the pressure ring 203, the primary steam enters the rod chamber 2011 through this gap. At this time, the axial connecting channel 303 of the valve core is connected to the connecting channel 404 of the valve stem piston, allowing the primary steam to flow as... Figure 4 As indicated by the arrow, it enters the axial connecting channel 303 of the valve core and the connecting channel 404 of the valve stem piston, which has a certain pressure relief function.

[0144] A2: During this process, the valve stem connecting channel 402 on the valve stem connecting end 401 gradually opens from the closed state, such as... Figure 4As shown, the valve stem gradually transitions to the second axial movement position. Specifically, the valve stem piston 403 moves upward by a specified stroke due to the action of the spring 42. This stroke connects the groove peripheral wall hole 4022 of the valve stem with the valve stem piston connecting channel 404, allowing the primary steam portion in the rod chamber 2011 to flow sequentially along the valve core axial connecting channel 303, the valve stem piston connecting channel 404, the groove peripheral wall hole 4022, and the valve stem end groove 4021 into the rodless chamber 2012. This is the fine-tuning stage of the desuperheater and pressure reducer.

[0145] A3: Furthermore, during the opening process, the valve stem gradually transitions to the third valve stem axial movement position. The valve stem connection end 401 releases the cut-off relationship with the valve core radial connecting channel 302, allowing primary steam passing through the valve sleeve outer through hole 2021 and valve sleeve inner through hole 2022 to directly enter the valve core inner cavity 301 through the valve core radial connecting channel 302. When the valve stem piston part 403 moves to abut against the valve core limiting block 305, the groove peripheral wall hole 4022 is fully opened, allowing the primary steam in the rod chamber 2011 to be depressurized to the rodless chamber 2012. This makes the valve chamber pressure in the rod chamber 2011 almost equal to the pressure in the rodless chamber 2012. At this time, the pressure difference between the upper and lower parts of the valve core is small, and they are in a balanced state. In addition, in this state, some primary steam also enters the rodless chamber 2012 from the valve core radial connecting channel 302, thereby achieving small flow regulation.

[0146] A4: Further, the valve stem continues to move upward. As the valve stem piston 403 moves to abut against the valve core limiting block 305, the upward movement of the valve stem drives the valve core to move upward as well. At this time, the valve core gradually transitions to the second valve core axial movement position, and the valve sleeve inlet 202, which was closed by the valve core, is gradually opened. When the lower end face of the valve core moves upward to abut against the lower end face of the pressure ring 203, the valve sleeve inlet 202 is fully opened. After the primary steam enters the valve sleeve inner cavity 201, it enters the valve core inner cavity 301 through the valve sleeve inlet 202 and then enters the rodless cavity 2012. The primary steam is gradually depressurized through the valve sleeve inlet 202, thereby achieving large flow rate regulation.

[0147] The valve core assembly of the desuperheater described in Embodiment 1 of the present invention has an adjustable ratio R between the minimum flow rate and the maximum flow rate that can reach more than 100, so as to meet the requirements of fine adjustment and to meet the opening and closing functions under high temperature and high pressure conditions and strict working conditions.

[0148] Furthermore, such as Figure 4 and Figure 9 The primary steam, after being depressurized and reduced in pressure, enters the rodless chamber 2012 and then enters the valve seat 205, entering the valve body cavity 101 through the valve seat opening 206 and the valve seat bottom hole 2053. When it passes through... Figure 1When the nozzle 710 is positioned as shown, the desuperheating water passes through the bypass pipe located outside the valve body, and sequentially through the spray pipe 720, spray branch pipe 740, nozzle seat 730 and nozzle 710 to form a mist and continuously spray steam to form secondary steam after desuperheating and depressurization. This secondary steam flows out through the medium outlet 103.

[0149] The following describes the desuperheater's operation process from valve core opening to closing:

[0150] S1: The valve stem piston part 403 of the valve stem moves downward. During the movement, the valve stem piston part 403 contacts the pressure ring 40 and applies pressure to the spring 42, causing the valve core to move downward under force. During the downward movement, the valve core gradually closes part of the valve sleeve inlet 202, causing the opening area of ​​the valve sleeve to gradually shrink and the flow rate to gradually decrease.

[0151] S2: When the bottom chamfer of the valve core is in contact with the valve seat sealing surface of the valve seat 205, the valve core stops moving downward.

[0152] S3: The external actuator continues to apply thrust to the valve stem, and the valve stem piston part 403 of the valve stem continues to be spring 42, so that the valve stem connection end 401 and the valve core inner ring 306 are combined to achieve adjustment. As the valve core inner through hole 3022 on the valve core inner ring 306 is gradually closed, the flow rate adjustment is further reduced.

[0153] S4: When the valve stem connection end 401 contacts the sealing surface of the valve core inner ring 306 located below the valve core inner through hole 3022, the valve core inner through hole 3022 on the valve core inner ring 306 is completely closed, so that the valve core inner ring 306 no longer participates in the adjustment function.

[0154] S5: The actuator continues to apply thrust to the distal end of the valve stem, and the valve stem piston part 403 of the valve stem connection end 401 continues to be spring 42. When the wall surface of the valve stem connection end 401 and located above the groove peripheral wall hole 4022 is in contact with the sealing surface inside the valve core, the valve sleeve inner cavity 201 is closed by the valve core, and the adjustment stops.

[0155] In summary, the present invention provides a desuperheating and pressure reducing device that can preheat the valve sleeve and valve body, effectively protect the valve core mechanism, facilitate drainage, and ensure the stable operation of the desuperheating and pressure reducing device.

[0156] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0157] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0158] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0159] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0160] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0161] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A desuperheating and pressure reducing device, characterized in that, The desuperheating and pressure reducing device includes: Valve sleeve, with valve sleeve inner cavity (201); A valve body, fitted over the outside of the valve sleeve and having an inner cavity (101) communicating with the inner cavity (201) of the valve sleeve; and A bypass pipeline is located outside the valve body and includes an upper bypass port and a lower bypass port that are connected to the inner cavity (201) of the valve sleeve and are axially spaced apart. The medium of the de-heating and pressure reducing device can flow through the inner cavity (201) of the valve sleeve and the inner cavity (101) of the valve body along the bypass pipeline to preheat the valve body and the valve sleeve. A discharge pipe (810) is provided on the bypass pipe and located between the upper port of the bypass and the lower port of the bypass, so that impurities in the inner cavity (201) of the valve sleeve can be discharged along the discharge pipe (810); The desuperheating and pressure reducing device further includes a valve core mechanism located within the inner cavity (201) of the valve sleeve for regulating the medium flow path. The valve core mechanism divides the inner cavity (201) of the valve sleeve into a rod-type cavity (2011) and a rodless cavity (2012). The valve core mechanism includes: The valve core is axially movable and connected to the inner cavity (201) of the valve sleeve, and is provided with an inner cavity (301), an outer annular groove, a radial connecting channel (302), and an axial connecting channel (303). The axial connecting channel (303) connects the inner cavity (301) of the valve core with the rod cavity (2011), and the radial connecting channel (302) connects the inner cavity (301) of the valve core with the outer annular groove. The valve stem is axially movable and connected to the inner cavity (301) of the valve core and includes a valve stem connection end (401). The valve stem connection end (401) is provided with a valve stem connection channel (402) for connecting the inner cavity (301) of the valve core and the rodless cavity (2012).

2. The desuperheating and pressure reducing device according to claim 1, characterized in that, The bypass pipeline includes: The connector (820) includes a first connector end (8201), a second connector end (8202) and a third connector end (8203) that are switchably connected in pairs. The first valve downstream pipeline (830) has one end forming the bypass upper port and the other end connected to the first connector end (8201); The second valve downstream pipeline (840) has one end forming the bypass lower port and the other end connected to the second connector end (8202); and One end of the discharge pipe (810) is connected to the third connector end (8203).

3. The desuperheating and pressure reducing device according to claim 2, characterized in that, The first downstream pipeline (830), the second downstream pipeline (840), and the discharge pipeline (810) are respectively provided with pipeline regulating components for adjusting the opening and closing of the pipeline.

4. The desuperheating and pressure reducing device according to claim 2, characterized in that, The second valve downstream pipeline (840) is provided with at least one perforated plate (7) for pressure reduction.

5. The desuperheating and pressure reducing device according to any one of claims 1 to 4, characterized in that, The valve sleeve includes a pressure ring (203), a valve sleeve sleeve (204), and a valve sleeve seat (205) arranged axially in sequence. The valve sleeve sleeve (204) is provided with a valve sleeve inlet (202) that connects the valve sleeve inner cavity (201) and the bypass upper port. The valve sleeve seat (205) is provided with a valve sleeve seat branch pipe (207) that connects the valve sleeve inner cavity (201) and the bypass lower port and extends out of the valve body.

6. The desuperheating and pressure reducing device according to claim 5, characterized in that, The valve sleeve (204) includes an inner valve sleeve (2041) and an outer valve sleeve (2042) nested together. The inner valve sleeve (2041) is provided with a plurality of inner valve sleeve through holes (2022) serving as the valve sleeve inlet (202). The outer valve sleeve (2042) is provided with a plurality of outer valve sleeve through holes (2021) serving as the valve sleeve inlet (202). The center of the inner valve sleeve through hole (2022) is staggered with the center of the outer valve sleeve through hole (2021).

7. The desuperheating and pressure reducing device according to claim 5, characterized in that, The valve body includes: Valve body housing (104) surrounds the valve body cavity (101) that defines the valve body. The medium inlet (102) is located on the peripheral wall of the valve body housing (104) and communicates with the valve sleeve inlet; and The medium outlet (103) is located at the axial end of the valve body housing and communicates with the inner cavity (101) of the valve body.

8. The desuperheating and pressure reducing device according to claim 1, characterized in that, The valve stem connecting channel (402) includes: A valve stem end groove (4021) is formed at the axial end of the valve stem connection end (401) and communicates with the rodless cavity (2012); and A groove peripheral wall hole (4022) is formed radially through the peripheral wall of the valve stem end groove (4021) and is used to connect the valve stem end groove (4021) with the valve core cavity (301). The groove peripheral wall hole (4022) extends axially and the hole width increases sequentially from the rod cavity (2011) side to the rodless cavity (2012) side.

9. The desuperheating and pressure reducing device according to claim 7, characterized in that, The desuperheating and pressure reducing device also includes: Valve cover, which is disposed on the valve body housing (104); and The spray assembly includes a spray pipe (720) surrounding the outside of the valve body, a plurality of sequentially connected spray branch pipes (740) extending from the spray pipe (720), a nozzle seat (730), and a nozzle (710) extending into the inner cavity (101) of the valve body.

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