Valve core mechanism and desuperheater / pressure reducer

Abstract

This invention discloses a valve core mechanism and a desuperheating and pressure reducing device. The valve core mechanism includes: a valve core with an inner cavity (301), an outer annular groove, a radial connecting channel (302), and an axial connecting channel (303); and a valve stem with a valve stem connecting end (401). The valve stem connecting end (401) has a valve stem connecting channel (402) for connecting the inner cavity (301) of the valve core with a rodless cavity (2012) at the other end of the valve core. This valve core mechanism includes a valve core and a valve stem that can be adjusted in position. The medium in the rod cavity can be depressurized to the inner cavity of the valve core through the axial connecting channel. The medium can be regulated at a small flow rate through the axial connecting channel and the valve stem connecting channel. The medium can be gradually regulated from a small flow rate to a large flow rate through the radial connecting channel and the valve sleeve inlet. This valve core mechanism has a simple structure and low operation and maintenance costs.

Description

Technical Field

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

[0002] A desuperheater is a device that uses water as a cooling medium to regulate the pressure and temperature of superheated or reheated steam. Traditional desuperheaters use pilot-operated valve components. These pilot-operated valve components are suitable for high-temperature, high-pressure, and critical shut-off conditions. The valve components move linearly to cause the pilot valve core to move first, thereby releasing the pressure in the valve chamber. After the main valve core is balanced by the force, it moves together with the pilot valve core.

[0003] Existing pilot-operated valve cores can only relieve pressure and cannot achieve regulation. Furthermore, the flow rate between the upper and lower ends of the main valve core and the mating parts is greater than that of ordinary sleeve regulating valves, which cannot meet the needs of small flow rate regulation. Even if a bypass design is added at the beginning of the pipeline network design to meet the needs of small flow rate regulation, and multiple regulating valves are connected in parallel to achieve the regulation of the pipeline network from small flow rate to large flow rate, the pipeline network design is complex, the equipment procurement and operation and maintenance costs are high, and the logic relationship of the control system is complex and prone to increasing the probability of failure. Summary of the Invention

[0004] The purpose of this invention is to provide a novel valve core mechanism and a desuperheating and pressure reducing device. The valve core mechanism has a simple structure, low operating and maintenance costs, and can realize pressure relief, small flow rate regulation and large flow rate regulation of the desuperheating and pressure reducing device.

[0005] To achieve the above objectives, the present invention provides a valve core mechanism, the valve core mechanism comprising:

[0006] The valve core has an inner cavity, an outer annular groove, a radial connecting channel, and an axial connecting channel. The axial connecting channel is used to axially connect the inner cavity of the valve core with the rod cavity at one end of the valve core, and the radial connecting channel is used to radially connect the inner cavity of the valve core with the outer annular groove.

[0007] A valve stem, including a valve stem connecting end, wherein the valve stem connecting end is provided with a valve stem connecting channel for axially connecting the inner cavity of the valve core with a rodless cavity at the other end of the valve core, and the valve stem connecting end is axially movable and connected to the inner cavity of the valve core and includes a first valve stem axial movement position, a second valve stem axial movement position, and a second valve stem axial movement position.

[0008] Specifically, at the first valve stem axial movement position, both the valve core radial connecting channel and the valve stem connecting channel are cut off; at the second valve stem axial movement position, the valve core radial connecting channel is cut off and the valve stem connecting channel is open; at the third valve stem axial movement position, both the valve core radial connecting channel and the valve stem connecting channel are open.

[0009] In some embodiments, the valve stem connecting end is provided with a valve stem piston portion that forms a piston-like engagement with the inner cavity of the valve core, and the valve stem piston portion is provided with an axially penetrating valve stem piston connecting channel.

[0010] In some embodiments, the valve core cavity is provided with an elastic element for pushing the valve core toward the rodless cavity side with elastic bias.

[0011] In some embodiments, the valve stem connection channel includes:

[0012] A valve stem end groove is formed at the axial end of the valve stem connection end and communicates with the rodless cavity;

[0013] 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.

[0014] In some embodiments, the groove peripheral wall holes include a first groove peripheral wall hole and a second groove peripheral wall hole arranged circumferentially spaced and having different heights.

[0015] In some embodiments, both the first groove peripheral wall hole and the second groove peripheral wall hole are arranged to extend axially, and the hole width increases sequentially from the rod cavity side to the rodless cavity side.

[0016] In some embodiments, the radial connecting channel of the valve core includes an outer through hole and an inner through hole formed radially through the peripheral wall of the valve core, wherein the outer through hole and the inner through hole are connected and their centers are staggered.

[0017] In addition, the present invention also provides a desuperheating and pressure reducing device, the desuperheating and pressure reducing device comprising:

[0018] The valve body has an internal cavity and a medium inlet and a medium outlet communicating with the internal cavity;

[0019] A valve sleeve is located inside the body cavity of the valve body and has a valve sleeve inner cavity that communicates with the body cavity of the valve body and a valve sleeve inlet that communicates with the medium inlet.

[0020] A valve core mechanism is located inside the valve sleeve cavity, and the valve core mechanism is the valve core mechanism described above.

[0021] The valve core is axially movable and connected to the inner cavity of the valve sleeve, 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 is cut off from the rodless cavity, and in the second axially movable valve core position, the valve sleeve inlet is connected to the rodless cavity.

[0022] In some embodiments, the valve sleeve cavity includes the rod chamber, the valve core outer annular groove, and the rodless chamber arranged axially in sequence. The rodless chamber is connected to the valve body cavity, so that the medium in the rodless chamber can be discharged sequentially along the valve body cavity and the medium outlet.

[0023] In some embodiments, the de-cooling and pressure reducing device further includes a spray assembly for spraying liquid into the inner cavity of the valve body. 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.

[0024] The present invention relates to a valve core mechanism and a desuperheating and pressure reducing device. The valve core mechanism includes a valve core and a valve stem that are position-adjustable. The medium in the stem cavity can be depressurized to the inner cavity of the valve core through the axial connecting channel of the valve core. The medium can be regulated at a small flow rate through the axial connecting channel of the valve core and the connecting channel of the valve stem. The medium can be gradually regulated from a small flow rate to a large flow rate through the radial connecting channel of the valve core and the valve sleeve inlet. The valve core mechanism has a simple structure, low operation and maintenance costs, and can realize the desuperheating and pressure reducing device for depressurization, small flow rate regulation and large flow rate regulation.

[0025] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0026] 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:

[0027] Figure 1 This 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;

[0028] Figure 2 for Figure 1 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;

[0029] Figure 3 for Figure 1 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;

[0030] Figure 4 for Figure 1 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;

[0031] Figure 5 for Figure 1A partial structural diagram showing the hole in the peripheral wall of the groove in its unfolded state;

[0032] Figure 6 for Figure 1 A partial structural diagram showing the valve cover;

[0033] Figure 7 for Figure 1 A partial structural diagram shows the valve body housing, pressure ring, and pressure ring fixing assembly;

[0034] Figure 8 for Figure 1 A partial structural diagram showing the valve body shell and valve seat;

[0035] Figure 9 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] Explanation of reference numerals in the attached figures

[0037] 101 Valve body cavity 102 Medium inlet

[0038] 103 Medium outlet 104 Valve body

[0039] 201 Valve sleeve inner cavity 202 Valve sleeve inlet

[0040] 203 Pressure ring, 204 Valve sleeve

[0041] 205 Valve seat 206 Valve seat opening

[0042] 2011 Rod-type cavity; 2012 Rodless cavity

[0043] 2021 Valve sleeve external through hole; 2022 Valve sleeve internal through hole

[0044] 2041 Inner sleeve of valve sleeve; 2042 Outer sleeve of valve sleeve

[0045] 2051 Valve sleeve seat ring; 2052 Valve sleeve seat base plate

[0046] 2053 Valve sleeve seat bottom hole; 2054 Valve sleeve seat sealing surface

[0047] 301 Valve core inner cavity; 302 Valve core radial connecting channel

[0048] 303 Axial connecting channel for valve core; 304 Valve core seat

[0049] 305 Valve core limiting block; 306 Valve core inner ring

[0050] 307 Valve core inner ring sealing structure; 308 Countersunk hole

[0051] 3071 Sealing ring; 3072 Valve core inner ring sealing ring.

[0052] 3073 Valve core inner ring sealing ring; 3074 Disc spring

[0053] 3021 External through hole of valve core; 3022 Internal through hole of valve core

[0054] 401 Valve stem connection end; 402 Valve stem connection channel

[0055] 403 Valve stem piston section; 404 Valve stem piston connecting passage

[0056] 405 Valve stem extension end

[0057] 4021 Valve stem end groove; 4022 Groove peripheral wall hole

[0058] 40221 First groove peripheral wall hole; 40222 Second groove peripheral wall hole

[0059] 402211 Upper hole on the peripheral wall of the first groove; 402212 Lower hole on the peripheral wall of the first groove

[0060] 402213 First Conical Section 402221 Second Conical Section

[0061] 710 nozzle, 720 spray pipe

[0062] 730 Sprinkler Head Mount, 740 Sprinkler Branch Pipe

[0063] 4. Elastic components

[0064] 41 Pressure ring 42 Spring

[0065] 51 First valve cover 52 Second valve cover

[0066] 53 Valve cover pressure ring 54 Valve cover pressure plate

[0067] 55 Valve cover sealing ring

[0068] 6. Pressure ring fixing assembly

[0069] 61 Third fixing part of the pressure ring 62 First fastener of the pressure ring

[0070] 63 Second fastener for pressure ring 64 Second fixing part for pressure ring

[0071] 65 First fixing part of the pressure ring; 66 Screw hole Detailed Implementation

[0072] 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.

[0073] The valve core mechanism and desuperheating and pressure reducing device according to the present invention are described below with reference to the accompanying drawings. The valve core mechanism has a simple structure, low operation and maintenance costs, and has a 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.

[0074] This invention discloses a valve core mechanism and a desuperheating and pressure reducing device. Existing pilot-operated valve cores can only relieve pressure and cannot achieve regulation. Furthermore, the flow rate between the upper and lower ends of the main valve core and its mating parts is greater than that of ordinary sleeve regulating valves, making it unsuitable for small-flow regulation. Even if a bypass design is added during the initial pipeline network design to meet small-flow regulation, and multiple regulating valves are connected in parallel to achieve regulation from small to large flow rates, the pipeline network design is complex, equipment procurement and operation and maintenance costs are high, and the control system logic is complex, increasing the probability of failure. Therefore, how to design a valve core mechanism with a simple structure that can gradually perform micro-adjustment, small-flow regulation, and large-flow regulation to achieve a large turnaround ratio and broad applicability is a problem worthy of research.

[0075] Therefore, refer to Figures 1 to 9 As shown, in order to achieve a large adjustable ratio and gradually perform micro-adjustment, small flow rate adjustment and large flow rate adjustment, the inventor of this application provides a valve core mechanism, which includes: a valve core and a valve stem;

[0076] Specifically, the valve core includes an inner cavity 301, an outer annular groove, a radial connecting channel 302, and an axial connecting channel 303. Figure 1 and Figure 2 As shown, the valve core, as an important internal component of the desuperheater and pressure reducer, has an overall sleeve-like structure and is embedded in the valve sleeve, which divides the valve sleeve into a rod-shaped cavity 2011 axially arranged on one side of the valve core 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 is used to axially connect the valve core inner cavity 301 with the rod-shaped cavity 2011 at one end of the valve core, and the valve core radial connecting channel 302 is used to radially connect the valve core inner cavity 301 with the valve core outer annular groove.

[0077] A valve stem, including a valve stem connecting end 401, wherein the valve stem connecting end 401 is provided with a valve stem connecting channel 402 for axially connecting the valve core inner cavity 301 and the rodless cavity 2012 at the other end of the valve core; the valve stem connecting end 401 is axially movable and connected to the valve core inner cavity 301 and includes a first valve stem axial movement position, a second valve stem axial movement position, and a third valve stem axial movement position; such as Figure 1 and Figure 2As 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 1 As shown, the valve stem extension end 405 is located within the rod chamber 2011, allowing the valve stem to move axially, thereby adjusting the axial position of the valve core. There is a certain lead difference between the valve core and the valve stem; this can be understood as the valve stem having a lead difference within the valve core. Figure 2 The first valve stem axial movement position shown, and as... Figure 4 The 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.

[0078] 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.

[0079] 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.

[0080] 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 2 and Figure 4As 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.

[0081] 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 2 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 achieve fine adjustment of the pressure relief flow and full flow of the pressure relief flow.

[0082] In order to achieve the cut-off and conduction of the rod cavity 2011, the valve core inner cavity 301, and the rod cavity 2011, 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 cavity 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 and the valve core inner cavity 301.

[0083] like Figure 3 and Figure 4As 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.

[0084] 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 4 and Figure 5 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.

[0085] Furthermore, in one embodiment, both the first groove peripheral wall hole 40221 and the second groove peripheral wall hole 40222 are axially extended and their widths increase 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 continuously increasing the medium flow area of ​​each first groove peripheral wall hole 40221, thus achieving adjustment from small to large flow rates. Preferably, in one embodiment, such as... Figure 5As 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.

[0086] 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.

[0087] 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, arranged radially spaced and interconnected on the peripheral wall of the valve core seat 304. In another embodiment, a valve core inner 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 valve core inner ring 306 respectively, which facilitates processing and saves costs. Further, in order to ensure the sealing between the valve core inner ring 306 and the valve core seat 304, a valve core inner ring sealing structure 307 can be disposed between the valve core seat 304 and the valve core inner ring 306, such as... Figure 2 and Figure 3As shown. 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 sealing upper ring 3072 located on the other axial side of the valve core inner ring 306 and sandwiched between the valve core inner ring 306 and the valve core seat 304. The valve core inner ring sealing upper ring 3072 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.

[0088] In addition, the present invention also provides a de-cooling and pressure reducing device, which includes: a valve body, a valve sleeve and a valve core mechanism;

[0089] Specifically, the valve body includes an inner cavity 101 and a medium inlet 102 and a medium outlet 103 communicating with the inner cavity 101, such as... Figure 1 and Figure 3 As shown; the valve body includes a valve body housing 104, a valve body cavity defined by the valve body housing 104, a media inlet 102 arranged radially on the peripheral wall of the valve body housing 104, and a media outlet 103 located at one axial end of the valve body cavity 101.

[0090] A valve sleeve, located within the inner cavity 101 of the valve body, has an inner cavity 201 communicating with the inner cavity 101 of the valve body and an inlet 202 communicating with the medium inlet 102; such as Figure 1 and Figure 4 As shown, the valve sleeve may include a pressure ring 203, a valve sleeve 204, and a valve sleeve seat 205 arranged axially in sequence. A valve sleeve inlet 202 is provided on the peripheral wall surface of the valve sleeve 204 to connect the medium inlet 102 and the valve sleeve inner cavity 201. A valve sleeve seat opening 206 is provided on the valve sleeve seat 205 to connect the valve sleeve inner cavity 201 and the valve body inner cavity 101.

[0091] The valve core mechanism is located inside the valve sleeve cavity 201. The valve core mechanism is the valve core mechanism described above. Since the valve core mechanism of this application adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0092] 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 3As shown, when the second valve core is in the axial moving position, as Figure 4 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.

[0093] 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.

[0094] Optionally, the valve body may also include 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 6 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.

[0095] 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 7 and Figure 8 As shown.

[0096] 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.

[0097] 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.

[0098] 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 7 and Figure 8 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.

[0099] Furthermore, the valve sleeve 204 may include an outer valve sleeve 2042 and an inner valve sleeve 2041 nested together. The outer valve sleeve 2042 has multiple external through holes 2021 on its peripheral wall, and the inner valve sleeve 2041 has multiple internal through holes 2022 on its peripheral wall. Figure 4As shown, at this time, 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 realizing the gradual decrease of the 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 force on one side and avoiding the vibration of the valve core mechanism and pipeline caused by the sudden pressure drop. It also reduces the scouring of the valve core mechanism by the high-pressure medium, prevents the valve sleeve 204 from being damaged and falling off by the medium, and also reduces noise.

[0100] Meanwhile, 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 8 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.

[0101] In one embodiment, the valve sleeve inner cavity 201 includes a rod-shaped cavity 2011, a valve core outer annular groove, and a rodless cavity 2012 arranged axially in sequence. 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. Figure 1 As shown, the valve sleeve inner cavity 201 can be understood as a straight inner cavity, in which 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 is formed as the valve sleeve seat sealing surface 2054. When the valve core moves to the first axial position, the valve core abuts against the valve sleeve seat sealing surface 2054 to seal the valve sleeve inlet 202.

[0102] Furthermore, in one embodiment, the desuperheater and pressure reducer also 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 9 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.

[0103] 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.

[0104] Furthermore, the working process of the desuperheater and pressure reducer is as follows:

[0105] 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.

[0106] 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 4 As 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.

[0107] 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.

[0108] 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 enters the rodless cavity 2012. The primary steam is gradually depressurized through the valve sleeve inlet 202, thereby achieving large flow regulation.

[0109] 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.

[0110] Furthermore, such as Figure 4 and Figure 8 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 1 When 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.

[0111] The following describes the desuperheater's operation process from valve core opening to closing:

[0112] 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.

[0113] 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.

[0114] 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 compress the 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.

[0115] 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.

[0116] 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 compress the 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.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] 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.

[0122] 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 valve core mechanism, characterized in that, The valve core mechanism includes: The valve core is provided with a valve core inner cavity (301), a valve core outer annular groove, a valve core radial connecting channel (302) and a valve core axial connecting channel (303). The valve core axial connecting channel (303) is used to axially connect the valve core inner cavity (301) with the rod cavity (2011) at one end of the valve core, and the valve core radial connecting channel (302) is used to radially connect the valve core inner cavity (301) with the valve core outer annular groove. A valve stem, including a valve stem connecting end (401), wherein the valve stem connecting end (401) is provided with a valve stem connecting channel (402) for axially connecting the valve core inner cavity (301) and the rodless cavity (2012) at the other end of the valve core, the valve stem connecting end (401) is axially movable in the valve core inner cavity (301) and includes a first valve stem axial movement position, a second valve stem axial movement position and a third valve stem axial movement position, the valve stem connecting channel (402) including a valve stem end groove (4021) and a groove peripheral wall hole ( 4022), the 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), the 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) includes a first groove peripheral wall hole (40221) and a second groove peripheral wall hole (40222) arranged circumferentially and with different heights. Specifically, at the first valve stem axial movement position, both the valve core radial connecting channel (302) and the valve stem connecting channel (402) are closed; at 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; at the third valve stem axial movement position, both the valve core radial connecting channel (302) and the valve stem connecting channel (402) are open.

2. The valve core mechanism according to claim 1, characterized in that, The valve stem connecting end (401) is provided with a valve stem piston part (403) that forms a piston cooperation with the inner cavity (301) of the valve core, and the valve stem piston part (403) is provided with an axially penetrating valve stem piston connecting channel (404).

3. The valve core mechanism according to claim 1, characterized in that, The valve core cavity (301) is provided with an elastic element (4) for pushing the valve core toward the rodless cavity (2012) with elastic bias.

4. The valve core mechanism according to claim 1, characterized in that, Both the first groove peripheral wall hole (40221) and the second groove peripheral wall hole (40222) are arranged to extend axially, and the hole width increases sequentially from the rod cavity (2011) side to the rodless cavity (2012) side.

5. The valve core mechanism according to claim 2, characterized in that, The radial connecting channel (302) of the valve core 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.

6. A desuperheating and pressure reducing device, characterized in that, The desuperheating and pressure reducing device includes: The valve body is provided with a valve body cavity (101) and a medium inlet (102) and a medium outlet (103) communicating with the valve body cavity (101). The valve sleeve is located inside the valve body cavity (101) and has a valve sleeve inner cavity (201) communicating with the valve body cavity (101) and a valve sleeve inlet (202) communicating with the medium inlet (102). A valve core mechanism is located inside the valve sleeve cavity (201), and the valve core mechanism is the valve core mechanism according to any one of claims 1 to 5; The valve core is axially movable and connected to the inner cavity (201) of the valve sleeve, 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 cut off from the rodless cavity (2012). In the second axially movable valve core position, the valve sleeve inlet (202) is connected to the rodless cavity (2012).

7. The desuperheating and pressure reducing device according to claim 6, characterized in that, The valve sleeve inner cavity (201) includes the rod chamber (2011), the valve core outer annular groove and the rodless chamber (2012) arranged axially in sequence. The rodless chamber (2012) is connected to the valve body inner cavity (101) so that the medium in the rodless chamber (2012) can be discharged sequentially along the valve body inner cavity (101) and the medium outlet (103).

8. The desuperheating and pressure reducing device according to claim 6, characterized in that, The de-cooling and pressure reducing device also includes a spray assembly for spraying liquid into the inner cavity (101) of the valve body. 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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