Anti-crystallization three-way valve and operation method

Abstract

The present application discloses an anti-crystallization three-way valve and an operating method, wherein the anti-crystallization three-way valve includes a valve body, a valve head, a self-flushing assembly, a heating assembly, a first valve stem assembly, a first sealing assembly, a second sealing assembly, and a second valve stem assembly; through the movement of the first valve stem assembly and the second valve stem assembly, while realizing the valve opening and closing functions, the three-way valve can also be well sealed. The present application solves the technical problems in the prior art that the three-way valve lacks an anti-crystallization device and method, has a poor sealing effect, and frequently disassembles and cleans crystals, increasing labor intensity and causing energy waste. The crystallization problem of the three-way valve is comprehensively addressed from preventing crystal formation to crystal cleaning, achieving the technical effect of preventing valve body crystallization blockage and reliably sealing the valve body, saving energy, and reducing labor intensity.

Description

Technical Field

[0001] The present application relates to the technical field of melamine valves, and in particular to an anti-crystallization three-way valve and an operating method thereof. Background Art

[0002] In melamine production equipment, three-way valves are crucial components for controlling material flow direction and volume. Under certain temperature, pressure, and residence time conditions, the media used in the melamine production process, such as those containing melamine and urea, are prone to crystallization. This crystallized material can adhere to the inner walls and valve core of the three-way valve, gradually accumulating and forming a blockage. This can prevent the valve from opening and closing properly, impacting material delivery and the normal operation of the production process.

[0003] Existing three-way valves have poor sealing performance and lack effective anti-crystallization measures. While some valves use heating to prevent crystallization, this approach uses poor energy efficiency. Existing technology also involves regularly disassembling and cleaning three-way valves to remove crystallization. However, frequent disassembly not only increases labor intensity and maintenance costs but also easily damages valve seals, impacting the valve's service life and sealing performance, potentially leading to production interruptions and significant economic losses. Therefore, there is an urgent need to design an anti-crystallization three-way valve and operating method to improve production continuity and stability. Summary of the Invention

[0004] The embodiments of the present application provide an anti-crystallization three-way valve and an operating method, thereby solving the technical problems that the three-way valve in the prior art lacks an anti-crystallization device and method, has poor sealing effect, and frequently disassembles and cleans crystals, increasing labor intensity and causing energy waste.

[0005] In a first aspect, an embodiment of the present invention provides an anti-crystallization three-way valve, comprising a valve body, a valve head, a self-flushing assembly, a heating assembly, a first valve stem assembly, a first sealing assembly, a second sealing assembly and a second valve stem assembly; the valve body is a hollow structure provided with an opening; the first valve stem assembly and the second valve stem assembly are arranged opposite to each other, and the opposite ends of the first valve stem assembly and the second valve stem assembly are connected to the valve heads, and the valve heads are both arranged in the valve body; the first valve stem assembly and the second valve stem assembly are both configured to drive the corresponding valve heads to slide in the valve body; the first sealing assembly comprises a first stuffing box, a first sealing ring, a first pressure ring and a first pressing piece; the first stuffing box is sleeved on the outside of the first valve stem assembly and is clamped on the inside of the valve body; the The first sealing ring is arranged between the first stuffing box and the valve body, and the end of the first sealing ring abuts against the first stuffing box; the first pressure ring is arranged between the first stuffing box and the valve body, and the first pressure ring abuts against the end of the first sealing ring away from the valve head; the first clamping member is arranged between the first stuffing box and the valve body, and the first clamping member abuts against the end of the first pressure ring away from the valve head; the second sealing assembly is arranged between the second valve stem assembly and the valve body; the self-flushing assembly is connected to the outside of the valve body, and the self-flushing assembly is configured to flush crystals in the valve body; the heating assembly is arranged on the outside of the valve body, and the heating assembly is configured to heat the valve body in sections.

[0006] In combination with the first aspect, in a possible implementation, the first sealing assembly includes a first sealing packing, a first packing pressure plate, a first packing sleeve, a first lifting plate and a first pair of split rings; the first sealing packing is arranged between the first valve stem assembly and the first stuffing box; the first packing sleeve is sleeved on the outside of the first valve stem assembly, and the first packing sleeve abuts against the end face of the first sealing packing; the first packing pressure plate is sleeved on the outside of the first valve stem assembly, and the first packing pressure plate abuts against the end face of the first packing sleeve; the first lifting plate is sleeved on the outside of the first stuffing box, and the first lifting plate and the first packing pressure plate are connected; the first pair of split rings are arranged between the first stuffing box and the first lifting plate.

[0007] In combination with the first aspect, in a possible implementation, the first stuffing box is provided with a first outer conical surface, and the first sealing ring is provided with a first inner conical surface close to the end face corresponding to the valve head; the first outer conical surface and the first inner conical surface are in contact with each other.

[0008] In combination with the first aspect, in one possible implementation, a second outer conical surface is provided at one end of the valve head close to the first valve stem assembly, and a second inner conical surface is provided at one end of the first stuffing box close to the corresponding valve head; the second outer conical surface and the second inner conical surface can fit together.

[0009] In combination with the first aspect, in a possible implementation, the self-flushing assembly includes a first flush valve, a second flush valve and a third flush valve; the valve body is provided with a first channel, a second channel and a third channel, the first channel and the second channel are respectively located on the movement paths of the two valve heads, and the first channel and the second channel can be opened or closed by the corresponding valve heads; the third channel is arranged between the first channel and the second channel; the first flush valve is arranged at one end of the first sealing assembly, and the first flush valve is connected to the valve body; the second flush valve is close to one end of the second sealing assembly, and the second flush valve is connected to the valve body; the third flush valve is arranged at the third channel, and the third flush valve is connected to the valve body.

[0010] In combination with the first aspect, in a possible implementation, the first flush valve, the second flush valve and the third flush valve all include a flush valve stem and a flush valve body; the flush valve body is provided with a flush channel; the flush valve stem is arranged in the flush valve body; the flush valve body is connected to the heating assembly; the flush valve stem can open or close the flush channel; and the valve body is provided with a through hole connected to the flush channel.

[0011] In combination with the first aspect, in a possible implementation, the heating assembly includes a first heat medium tube, a second heat medium tube and a third heat medium tube; the first heat medium tube is arranged on the outside of the first channel, the second heat medium tube is arranged on the outside of the second channel, and the third heat medium tube is arranged on the outside of the third channel; a first heat medium baffle is provided at the connection between the third heat medium tube and the first heat medium tube for isolation, and a second heat medium baffle is provided at the connection between the third heat medium tube and the second heat medium tube for isolation; the first heat medium tube, the second heat medium tube and the third heat medium tube are all provided with independent heat medium inlets and heat medium outlets.

[0012] In combination with the first aspect, in a possible implementation, the first valve stem assembly includes a first upper valve stem, a first lower valve stem, a first connecting sleeve, a first retaining ring, a first elastic retaining ring and a first spherical pad; one end of the first upper valve stem is connected to the first lower valve stem, and the end of the first lower valve stem away from the first upper valve stem is connected to the valve head; a first spherical pad is also provided between the first upper valve stem and the first lower valve stem; the first connecting sleeve is sleeved on the outside of the first upper valve stem and the first lower valve stem, and one end of the first connecting sleeve is clamped with the first upper valve stem, and the other end thereof is clamped with the first lower valve stem; the first retaining ring is sleeved on the outside of the first connecting sleeve; one end of the first elastic retaining ring abuts against the first connecting sleeve, and the other end thereof abuts against the first retaining ring.

[0013] In the second aspect, an embodiment of the present invention provides an operating method for an anti-crystallization three-way valve, which is applicable to the anti-crystallization three-way valve as described in the first aspect or in combination with any possible implementation method of the first aspect, and includes the following steps: the first sealing assembly also includes a first fastener, and the first stuffing pressure plate is connected to the first lifting plate through the first fastener; S1: open the valve corresponding to the first channel, and the first valve stem assembly drives the corresponding valve head to move toward the direction close to the first stuffing box. At this time, the second outer conical surface and the second inner conical surface are fitted together, which can seal the first valve stem assembly and the first stuffing box; and the corresponding valve head applies a force to the first stuffing box, so that the first stuffing box squeezes the first sealing ring, and the first sealing ring squeezes in the radial direction respectively. Press the first stuffing box and the valve body to achieve a good seal; open the first heat medium pipe to heat the medium passing through the first channel; S2: close the valve corresponding to the first channel, and the first valve stem drives the corresponding valve head to move away from the first stuffing box. At this time, open the first flushing valve for online cleaning. The cleaning medium can apply a force to the first stuffing box, so that the first stuffing box squeezes the first sealing ring, and the first sealing ring squeezes the first stuffing box and the valve body in the radial direction respectively, so as to achieve a good seal; close the first heat medium pipe to prevent energy waste; S3: during or after operating the valve to open or close the first channel, tighten the first fastener to adjust and maintain the sealing preload of the first sealing packing in the first sealing assembly.

[0014] In combination with the second aspect, in a possible implementation, in step S3, when the first fastener is tightened, the first packing pressure plate transmits the pre-tightening force to the first packing sleeve, the first packing sleeve compresses the first sealing packing, and the first sealing packing is tightly fitted with the first valve stem assembly and the first stuffing box, respectively, thereby achieving a good seal; at the same time, by tightening the first fastener, the first packing pressure plate provides a force to the first lifting plate away from the valve head, and a first pair of open rings are arranged between the first lifting plate and the first stuffing box. The first lifting plate transmits the force to the first pair of open rings, and the first pair of open rings transmits the force to the first stuffing box. At this time, the first stuffing box can squeeze the first sealing packing from a direction away from the valve head, thereby further making the first sealing packing tightly fit with the first valve stem assembly and the first stuffing box, respectively, further achieving a good seal.

[0015] One or more technical solutions provided in this application have at least the following technical effects:

[0016] The present invention employs an anti-crystallization three-way valve comprising a valve body, a valve head, a self-flushing assembly, a heating assembly, a first valve stem assembly, a first sealing assembly, a second sealing assembly, and a second valve stem assembly. The movement of the first and second valve stem assemblies enables the valve to be opened and closed while also maintaining a good seal between the first and second sealing assemblies, thereby effectively preventing leakage of the medium. Operation is simple and straightforward, requiring no complex tools or specialized skills. The first and second valve stem assemblies facilitate installation, disassembly, and routine maintenance, thereby improving work efficiency and reducing maintenance costs.

[0017] The present application solves the technical problems in the prior art that the three-way valve lacks a device and method for preventing crystallization, has poor sealing effect, and frequently disassembles and cleans crystals, increasing labor intensity and causing energy waste. The ingenious sealing structure can achieve good sealing of the valve when opening and closing, and can also regularly clean crystals in the valve body. It also saves energy while preventing crystallization by means of zoned heating. The present application comprehensively addresses the crystallization problem of the three-way valve from preventing crystal formation to crystal cleaning, achieving the technical effect of preventing crystal blockage of the valve body and reliably sealing the valve body, saving energy, and reducing labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments of the present application or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A schematic diagram of a conventional three-way valve provided in an embodiment of the present application;

[0020] Figure 2 A cross-sectional view of an anti-crystallization three-way valve provided in an embodiment of the present application;

[0021] Figure 3 for Figure 2 A magnified view of point A;

[0022] Figure 4 for Figure 2 Enlarged view of point B;

[0023] Figure 5 A cross-sectional view of a first valve stem assembly provided in an embodiment of the present application;

[0024] Figure 6 for Figure 3 Enlarged view of point C;

[0025] Figure 7 for Figure 4 DD cross-sectional view;

[0026] Figure 8 This is a flow chart of the operating method of the anti-crystallization three-way valve provided in an embodiment of the present application.

[0027] Icons: 1-valve body; 11-first channel; 12-second channel; 13-third channel; 2-valve head; 21-second outer cone; 3-self-flushing assembly; 31-first flushing valve; 311-flushing valve stem; 312-flushing valve body; 32-second flushing valve; 33-third flushing valve; 4-heating assembly; 41-first heat medium pipe; 42-second heat medium pipe; 43-third heat medium pipe; 44-heat medium inlet; 45-heat medium outlet; 5-first valve stem assembly; 51-first upper valve stem; 52-first lower valve stem; 53-first connection Sleeve; 54-first retaining ring; 55-first elastic retaining ring; 56-first spherical pad; 6-first sealing assembly; 61-first stuffing box; 611-first outer cone; 612-second inner cone; 62-first sealing ring; 621-first inner cone; 63-first pressure ring; 64-first pressing member; 65-first sealing packing; 66-first packing pressure plate; 67-first packing pressure sleeve; 68-first lifting plate; 69-first split ring; 691-first fastener; 7-second sealing assembly; 8-second valve stem assembly; 9-handwheel. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0029] In the description of the embodiments of the present application, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limitations on the present application. The terms "first", "second" and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0030] like Figure 1 As shown, conventional three-way valves lack effective anti-crystallization measures. While some valves use heating to prevent crystallization, the heating effect is uneven and cannot completely eliminate the risk of crystallization. Regular disassembly and cleaning are also options, but frequent disassembly not only increases labor intensity and maintenance costs but also easily damages valve seals, affecting the valve's service life and sealing performance, and can even cause production interruptions and significant economic losses. Therefore, there is an urgent need to design an anti-crystallization three-way valve and operating method to improve production continuity and stability.

[0031] The embodiment of the present invention provides an anti-crystallization three-way valve, such as Figure 1-7As shown, it includes a valve body 1, a valve head 2, a self-flushing component 3, a heating component 4, a first valve stem component 5, a first sealing component 6, a second sealing component 7 and a second valve stem component 8; the valve body 1 is a hollow structure with an opening; the first valve stem component 5 and the second valve stem component 8 are arranged opposite to each other, and the opposite ends of the first valve stem component 5 and the second valve stem component 8 are connected to the valve head 2, and the valve heads 2 are both arranged in the valve body 1; the first valve stem component 5 and the second valve stem component 8 are both configured to drive the corresponding valve head 2 to slide in the valve body 1; the first sealing component 6 includes a first stuffing box 61, a first sealing ring 62, a first pressure ring 63 and a first pressing member 64; the first stuffing box 61 is sleeved on the outside of the first valve stem component 5 and is clamped to the inside of the valve body 1 ; The first sealing ring 62 is arranged between the first stuffing box 61 and the valve body 1, and the end of the first sealing ring 62 abuts against the first stuffing box 61; the first pressure ring 63 is arranged between the first stuffing box 61 and the valve body 1, and the first pressure ring 63 abuts against the end of the first sealing ring 62 away from the valve head 2; the first clamping member 64 is arranged between the first stuffing box 61 and the valve body 1, and the first clamping member 64 abuts against the end of the first pressure ring 63 away from the valve head 2; a second sealing assembly 7 is arranged between the second valve stem assembly 8 and the valve body 1; a self-flushing assembly 3 is connected to the outside of the valve body 1, and the self-flushing assembly 3 is configured to flush the crystals in the valve body 1; a heating assembly 4 is provided on the outside of the valve body 1, and the heating assembly 4 is configured to perform segmented heating on the valve body 1.

[0032] Exemplarily, the second sealing assembly 7 includes a second stuffing box, a second sealing ring, a second pressure ring, and a second pressing member; the second stuffing box is sleeved on the outside of the second valve stem assembly 8 and clamped on the inside of the valve body 1; the second sealing ring is arranged between the second stuffing box and the valve body 1, and the end of the second sealing ring abuts against the second stuffing box; the second pressure ring is arranged between the second stuffing box and the valve body 1, and the second pressure ring abuts against the end of the second sealing ring away from the valve head 2; the second pressing member is arranged between the second stuffing box and the valve body 1, and the second pressing member abuts against the end of the second pressure ring away from the valve head 2. The structure of the second sealing assembly 7 is the same as that of the first sealing assembly 6, and it is configured to seal the medium in the valve body 1 to prevent the medium from leaking and crystallizing.

[0033] Exemplarily, the first valve stem assembly 5 and the second valve stem assembly 8 are both capable of sliding within the valve body 1, thereby opening or closing the first channel 11 and the second channel 12. A third outer conical surface is provided on opposite sides of the two valve heads 2, and a third inner conical surface is provided within the valve body 1. The third outer conical surface can fit with the third inner conical surface, thereby achieving a good seal when the valve is closed.

[0034] Illustratively, the present application can achieve a good sealing effect of the first sealing assembly 6 and the second sealing assembly 7 through the movement of the first valve stem assembly 5 and the second valve stem assembly 8, and the first sealing assembly 6 and the second sealing assembly 7 can effectively prevent the leakage of the medium.

[0035] For example, the present invention can ensure that the first sealing assembly 6 and the second sealing assembly 7 maintain a good sealing effect under different working conditions. For example, the three-way valve is used in some high-pressure and high-vacuum equipment, which can meet strict sealing requirements. The present invention can achieve the opening and closing functions of the valve while also achieving a good seal between the first sealing assembly 6 and the second sealing assembly 7 through the movement of the first valve stem assembly 5 and the second valve stem assembly 8. The operation is simple and direct, and does not require complex tools or professional skills.

[0036] For example, the three-way valve of the present application is easy for workers to install, disassemble, and perform routine maintenance, thereby improving work efficiency and reducing maintenance costs. In addition, the first sealing assembly 6 and the second sealing assembly 7 can withstand mechanical vibration and impact without loosening or failure, thereby ensuring the long-term stable operation of the three-way valve.

[0037] Exemplarily, the first valve stem assembly 5 and the second valve stem assembly 8 are both connected to a handwheel 9 at one end away from the valve head 2 .

[0038] In the embodiment of this application, Figure 1 As shown, the first sealing assembly 6 includes a first sealing packing 65, a first packing pressure plate 66, a first packing sleeve 67, a first lifting plate 68 and a first pair of split rings 69; a first sealing packing 65 is arranged between the first valve stem assembly 5 and the first stuffing box 61; the first packing sleeve 67 is sleeved on the outside of the first valve stem assembly 5, and the first packing sleeve 67 abuts against the end face of the first sealing packing 65; the first packing pressure plate 66 is sleeved on the outside of the first valve stem assembly 5, and the first packing pressure plate 66 abuts against the end face of the first packing sleeve 67; the first lifting plate 68 is sleeved on the outside of the first stuffing box 61, and the first lifting plate 68 and the first packing pressure plate 66 are connected; the first pair of split rings 69 is arranged between the first stuffing box 61 and the first lifting plate 68.

[0039] Exemplarily, the structure of the second sealing assembly 7 is the same as that of the first sealing assembly 6 , and is configured to seal the medium in the valve body 1 to prevent the medium from leaking and crystallizing.

[0040] Illustratively, the first sealing packing 65, the first packing pressure plate 66, the first packing gland 67, the first lifting plate 68, and the first split ring 69 constitute a lifting sealing mechanism, which is operated by tightening the first fastener 691. When the first fastener 691 is tightened, the first packing pressure plate 66 transmits a pre-tightening force to the first packing gland 67, which compresses the first sealing packing 65, causing the first sealing packing 65 to fit tightly against the first valve stem assembly 5 and the first stuffing box 61, respectively, thereby achieving a good sealing effect. At the same time, the first fastener 691 can provide a force to the first lifting plate 68 in the direction away from the valve head 2, and a first pair of split rings 69 are arranged between the first lifting plate 68 and the first stuffing box 61. The first lifting plate 68 can transmit the force to the first pair of split rings 69, and the first pair of split rings 69 then transmit the force to the first stuffing box 61. At this time, the first stuffing box 61 can squeeze the first sealing packing 65 from the direction away from the valve head 2, so that the first sealing packing 65 is tightly fitted with the first valve stem assembly 5 and the first stuffing box 61 respectively, further achieving a good sealing effect.

[0041] In the embodiment of this application, Figure 1-7 As shown, the first stuffing box 61 is provided with a first outer conical surface 611 , and the end surface of the first sealing ring 62 close to the corresponding valve head 2 is provided with a first inner conical surface 621 ; the first outer conical surface 611 and the first inner conical surface 621 are in contact with each other.

[0042] In the embodiment of this application, Figure 1-7 As shown, a second outer conical surface 21 is provided at one end of the corresponding valve head 2 close to the first valve stem assembly 5, and a second inner conical surface 612 is provided at one end of the first stuffing box 61 close to the corresponding valve head 2; the second outer conical surface 21 and the second inner conical surface 612 can fit together.

[0043] In the embodiment of this application, Figure 1-7 As shown, the self-flushing assembly 3 includes a first flushing valve 31, a second flushing valve 32 and a third flushing valve 33; the valve body 1 is provided with a first channel 11, a second channel 12 and a third channel 13, and the first channel 11 and the second channel 12 are respectively located on the movement paths of the two valve heads 2, and the first channel 11 and the second channel 12 can be opened or closed by the corresponding valve heads 2; the third channel 13 is arranged between the first channel 11 and the second channel 12; the first flushing valve 31 is arranged at one end of the first sealing assembly 6, and the first flushing valve 31 is communicated with the valve body 1; the second flushing valve 32 is close to one end of the second sealing assembly 7, and the second flushing valve 32 is communicated with the valve body 1; the third flushing valve 33 is arranged at the third channel 13, and the third flushing valve 33 is communicated with the valve body 1.

[0044] In the embodiment of this application, Figure 1-7As shown, the first flush valve 31, the second flush valve 32 and the third flush valve 33 all include a flush valve stem 311 and a flush valve body 312; the flush valve body 312 is provided with a flushing channel; the flush valve stem 311 is arranged in the flush valve body 312; the flush valve body 312 is connected to the heating component 4; the flush valve stem 311 can open or close the flushing channel; and a through hole connected to the flushing channel is provided on the valve body 1.

[0045] For example, when the first channel 11 of the three-way valve is closed and the second channel 12 is opened, the first flushing valve 31 at the first channel 11 is opened and the cleaning work inside the valve body 1 is performed. Similarly, when the second channel 12 of the three-way valve is closed and the first channel 11 is opened, the second flushing valve 32 at the second channel 12 is opened and the cleaning work inside the valve body 1 is performed.

[0046] For example, the present application is provided with a first flush valve 31, a second flush valve 32 and a third flush valve 33, which can clean the inside of the valve body 1 at the first channel 11, the second channel 12 and the third channel 13 respectively during pipeline overhaul. This setting method facilitates later maintenance, thereby reducing the difficulty of cleaning the pipeline.

[0047] For example, heat medium pipes are installed outside the first, second, and third flush valves 31, 32, and 33. When the first, second, and third flush valves 31, 32, and 33 are closed, the heat medium installed outside the closed flush valves is suspended, thereby improving the energy efficiency of the entire heating system. The heat medium pipes outside the flush valves are connected to the heat medium pipes at nearby ports. The heat from the heat medium pipes prevents the flushing medium from crystallizing due to temperature drops.

[0048] Exemplarily, the first flush valve 31 and the second flush valve 32 are both arranged at two dead corner positions of the three-way valve, which is conducive to flushing the medium residue in the dead corner position of the valve body 312. The third flush valve 33 faces the third channel 13, thereby facilitating flushing the medium residue in the third channel 13.

[0049] For example, the head of the flushing valve stem 311 is adapted to the arc of the inner cavity of the valve body 1 , which is beneficial to the circulation of the flushing medium and avoids the residual medium in the dead corner inside the valve body 1 during flushing.

[0050] In the embodiment of this application, Figure 1 As shown, the heating assembly 4 includes a first heat medium tube 41, a second heat medium tube 42 and a third heat medium tube 43; the first heat medium tube 41 is arranged outside the first channel 11, the second heat medium tube 42 is arranged outside the second channel 12, and the third heat medium tube 43 is arranged outside the third channel 13;

[0051] A first heat medium baffle is provided at the connection between the third heat medium pipe 43 and the first heat medium pipe 41 for isolation, and a second heat medium baffle is provided at the connection between the third heat medium pipe 43 and the second heat medium pipe 42 for isolation; the first heat medium pipe 41, the second heat medium pipe 42 and the third heat medium pipe 43 are all provided with independent heat medium inlets 44 and heat medium outlets 45.

[0052] For example, when the first channel 11 is closed, the first heat medium pipe 41 can suspend circulation. Similarly, when the second channel 12 is closed, the second heat medium pipe 42 can suspend circulation. This approach can improve the energy efficiency of the entire heating system.

[0053] For example, when any of the first, second, or third heat medium pipes 41, 42, and 43 require maintenance, overhaul, or modification, that pipe can be isolated without affecting the normal operation of the other pipes. This improves the system's operability and flexibility and reduces the disruption to overall system operation caused by pipe maintenance. Furthermore, the segmented design of the pipes makes it easier to pinpoint the fault scope. When a system problem occurs, the faulty pipe can be quickly identified, allowing maintenance personnel to focus on troubleshooting and repairing it. This design shortens troubleshooting time and minimizes the impact of system failures on production and daily life.

[0054] For example, for areas with different usage requirements, such as building areas with different functions or production workshops with different process requirements, different heat medium parameters and operating modes can be designed according to their specific heat load requirements, thereby achieving personalized heating and enabling the three-way valve to better meet diverse heating needs.

[0055] In the embodiment of this application, Figure 1-7 As shown, the first valve stem assembly 5 includes a first upper valve stem 51, a first lower valve stem 52, a first connecting sleeve 53, a first retaining ring 54, a first elastic retaining ring 55 and a first spherical pad 56; one end of the first upper valve stem 51 is connected to the first lower valve stem 52, and the end of the first lower valve stem 52 away from the first upper valve stem 51 is connected to the valve head 2; a first spherical pad 56 is also provided between the first upper valve stem 51 and the first lower valve stem 52; the first connecting sleeve 53 is sleeved on the outside of the first upper valve stem 51 and the first lower valve stem 52, and one end of the first connecting sleeve 53 is clamped with the first upper valve stem 51, and the other end is clamped with the first lower valve stem 52; the first retaining ring 54 is sleeved on the outside of the first connecting sleeve 53; one end of the first elastic retaining ring 55 abuts against the first connecting sleeve 53, and the other end abuts against the first retaining ring 54.

[0056] For example, the first elastic retaining ring 55 can prevent axial displacement between the first connecting sleeve 53 and the first retaining ring 54. The first valve stem assembly 5 and the second valve stem assembly 8 have the same structure.

[0057] For example, the first spherical pad 56 can prevent wear between the first upper valve stem 51 and the first lower valve stem 52, thereby extending the service life of the first upper valve stem 51 and the first lower valve stem 52. The first connecting sleeve 53, the first retaining ring 54 and the first elastic retaining ring 55 play a connecting role.

[0058] Exemplarily, the first valve stem assembly 5 adopts a split design, which is convenient for installation and maintenance. Specifically, the split structure makes the installation of the first valve stem assembly 5 more convenient, and can be operated more flexibly during the installation process, reducing the difficulty of installation; for example, when the first upper valve stem 51 fails and needs to be repaired or replaced, there is no need to disassemble the entire first valve stem assembly 5, only the first upper valve stem 51 needs to be processed, thereby reducing the maintenance workload and maintenance time, and improving the maintainability of the equipment.

[0059] For example, the split-type design allows for the selection of different materials or specialized structural designs based on the stress conditions at different parts of the first valve stem assembly 5. For example, the first upper valve stem 51 is constructed of the high-strength and wear-resistant material S51740, while the first lower valve stem 52 is constructed of Hastelloy C alloy, which is suitable for melamine production conditions. These materials ensure the overall strength and performance of the first valve stem assembly 5 while also reducing costs. Furthermore, the split-type structure can alleviate stress concentration to a certain extent, thereby improving the fatigue resistance of the first valve stem assembly 5.

[0060] An embodiment of the present invention provides an operating method for an anti-crystallization three-way valve, which is applicable to the anti-crystallization three-way valve, comprising the following steps: the first sealing assembly 6 further includes a first fastener 691, and the first packing pressure plate 66 is connected to the first lifting plate 68 via the first fastener 691;

[0061] S1: The valve corresponding to the first channel 11 is opened, and the first valve stem assembly 5 drives the corresponding valve head 2 to move toward the first stuffing box 61. At this time, the second outer conical surface 21 fits with the second inner conical surface 612, thereby sealing the first valve stem assembly 5 and the first stuffing box 61.

[0062] Furthermore, the corresponding valve head 2 applies a force to the first stuffing box 61, so that the first stuffing box 61 squeezes the first sealing ring 62, and the first sealing ring 62 squeezes the first stuffing box 61 and the valve body 1 in the radial direction, thereby achieving a good seal;

[0063] Open the first heat medium pipe 41 to heat the medium passing through the first channel 11;

[0064] S2: The valve corresponding to the first channel 11 is closed, and the first valve stem drives the corresponding valve head 2 to move away from the first stuffing box 61. At this time, the first flushing valve 31 is opened for online cleaning. The cleaning medium can exert a force on the first stuffing box 61, causing the first stuffing box 61 to squeeze the first sealing ring 62. The first sealing ring 62 squeezes the first stuffing box 61 and the valve body 1 in the radial direction, thereby achieving a good seal.

[0065] Close the first heat medium pipe 41 to prevent energy waste;

[0066] S3: During or after the operation of the valve to open or close the first channel 11 , tighten the first fastener 691 to adjust and maintain the sealing pre-tightening force of the first sealing filler 65 in the first sealing assembly 6 .

[0067] In the embodiment of this application, Figure 1 As shown, in step S3, when the first fastener 691 is tightened, the first packing pressing plate 66 transmits the pre-tightening force to the first packing pressing sleeve 67, and the first packing pressing sleeve 67 compresses the first sealing packing 65. The first sealing packing 65 is tightly fitted with the first valve stem assembly 5 and the first stuffing box 61, respectively, thereby achieving a good seal;

[0068] At the same time, by tightening the first fastener 691, the first packing pressure plate 66 provides a force to the first lifting plate 68 in the direction away from the valve head 2. A first pair of split rings 69 are provided between the first lifting plate 68 and the first stuffing box 61. The first lifting plate 68 transfers the force to the first pair of split rings 69, and the first pair of split rings 69 transfers the force to the first stuffing box 61. At this time, the first stuffing box 61 can squeeze the first sealing packing 65 from the direction away from the valve head 2, thereby further making the first sealing packing 65 fit tightly with the first valve stem assembly 5 and the first stuffing box 61 respectively, further achieving good sealing.

[0069] Exemplarily, the second sealing assembly 7 further includes a second fastener, and the second packing pressure plate is connected to the second lifting plate via the second fastener; when the valve corresponding to the second channel 12 is opened, the second valve stem assembly 8 drives the corresponding valve head 2 to move toward the second stuffing box. At this time, the second outer conical surface 21 is in contact with the second inner conical surface 612, thereby sealing the second valve stem assembly 8 and the second stuffing box.

[0070] Furthermore, the corresponding valve head 2 applies force to the second stuffing box, so that the second stuffing box squeezes the second sealing ring, and the second sealing ring squeezes the second stuffing box and the valve body 1 in the radial direction, thereby achieving good sealing;

[0071] Open the second heat medium pipe 42 to heat the medium passing through the second channel 12;

[0072] The valve corresponding to the second channel 12 is closed, and the second valve stem drives the corresponding valve head 2 to move away from the second stuffing box. At this time, the second flushing valve 32 is opened for online cleaning. The cleaning medium can exert a force on the second stuffing box, causing the second stuffing box to squeeze the second sealing ring. The second sealing ring squeezes the second stuffing box and the valve body 1 in the radial direction, thereby achieving a good seal.

[0073] Close the second heat medium pipe 42 to prevent energy waste;

[0074] During or after the operation of the valve to open or close the second passage 12 , the second fastener is tightened to adjust and maintain the sealing pre-tightening force of the second sealing filler in the second sealing assembly 7 .

[0075] Illustratively, when the second fastener is tightened, the second packing pressure plate transmits the pre-tightening force to the second packing sleeve, and the second packing sleeve compresses the second sealing packing, and the second sealing packing fits tightly with the second valve stem assembly 8 and the second stuffing box, respectively, thereby achieving a good seal; at the same time, by tightening the second fastener, the second packing pressure plate provides a force to the second lifting plate away from the valve head 2, and a second pair of split rings are provided between the second lifting plate and the second stuffing box. The second lifting plate transmits the force to the second pair of split rings, and the second pair of split rings transmits the force to the second stuffing box. At this time, the second stuffing box can squeeze the second sealing packing from a direction away from the valve head 2, thereby further making the second sealing packing fit tightly with the second valve stem assembly 8 and the second stuffing box, respectively, further achieving a good seal.

[0076] For example, in step S2, during the cleaning process, opening the first flush valve 31 allows the cleaning medium to flow into the valve body 1. The pressure of the cleaning medium helps maintain the sealing state of the first sealing assembly 6. Specifically, the cleaning medium exerts a force on the first stuffing box 61, causing it to squeeze the first sealing ring 62. The first sealing ring 62 then radially squeezes the first stuffing box 61 and the valve body 1, thereby achieving a good seal. Therefore, the first sealing assembly 6 can effectively seal the three-way valve whether the valve is open or closed, thereby preventing medium leakage.

[0077] For example, through its unique structural design and material selection, this application effectively prevents crystallization and accumulation of media within the valve, thereby ensuring normal valve opening and closing and smooth flow of the media fluid, reducing equipment failures and production interruptions caused by crystallization blockage. Because the melamine production environment is somewhat corrosive, this three-way valve is manufactured from Hastelloy C alloy, which has excellent corrosion and wear resistance, extending the service life of the three-way valve and reducing equipment maintenance costs.

[0078] For example, the present application optimizes the sealing structure, which can effectively prevent the leakage of melamine fluid, thereby avoiding material waste and environmental pollution and ensuring the safety of the production process.

[0079] For example, the design of the present application takes into account a valve stem structure that is easy to disassemble and assemble, thereby facilitating regular maintenance, inspection, and replacement of parts by maintenance personnel, thereby improving the maintainability of the equipment and reducing downtime for maintenance.

[0080] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0081] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. An anti-crystallization three-way valve, characterized in that: It comprises a valve body (1), a valve head (2), a self-flushing assembly (3), a heating assembly (4), a first valve stem assembly (5), a first sealing assembly (6), a second sealing assembly (7) and a second valve stem assembly (8); The valve body (1) is a hollow structure provided with an opening; The first valve stem assembly (5) and the second valve stem assembly (8) are arranged opposite to each other, and opposite ends of the first valve stem assembly (5) and the second valve stem assembly (8) are both connected to the valve head (2), and the valve head (2) is both arranged in the valve body (1); The first valve stem assembly (5) and the second valve stem assembly (8) are both configured to drive the corresponding valve head (2) to slide within the valve body (1); The first sealing assembly (6) comprises a first stuffing box (61), a first sealing ring (62), a first pressure ring (63) and a first pressing member (64); The first stuffing box (61) is sleeved on the outside of the first valve stem assembly (5) and is clamped on the inside of the valve body (1); The first sealing ring (62) is arranged between the first stuffing box (61) and the valve body (1), and the end of the first sealing ring (62) abuts against the first stuffing box (61); The first pressure ring (63) is arranged between the first stuffing box (61) and the valve body (1), and the first pressure ring (63) abuts against an end of the first sealing ring (62) away from the valve head (2); The first pressing member (64) is arranged between the first stuffing box (61) and the valve body (1), and the first pressing member (64) abuts against an end of the first pressure ring (63) away from the valve head (2); The second sealing assembly (7) is provided between the second valve stem assembly (8) and the valve body (1); The outer side of the valve body (1) is connected to the self-flushing component (3), and the self-flushing component (3) is configured to flush the crystals in the valve body (1); The heating component (4) is provided on the outside of the valve body (1), and the heating component (4) is configured to heat the valve body (1) in sections.

2. The anti-crystallization three-way valve according to claim 1, characterized in that: The first sealing assembly (6) comprises a first sealing filler (65), a first filler pressure plate (66), a first filler pressure sleeve (67), a first lifting plate (68) and a first split ring (69); The first sealing packing (65) is provided between the first valve stem assembly (5) and the first stuffing box (61); The first packing gland (67) is sleeved on the outside of the first valve stem assembly (5), and the first packing gland (67) abuts against the end surface of the first sealing packing (65); The first packing pressure plate (66) is sleeved on the outside of the first valve stem assembly (5), and the first packing pressure plate (66) abuts against the end surface of the first packing pressure sleeve (67); The first lifting plate (68) is sleeved on the outside of the first stuffing box (61), and the first lifting plate (68) is connected to the first stuffing pressure plate (66); The first split ring (69) is arranged between the first stuffing box (61) and the first lifting plate (68).

3. The anti-crystallization three-way valve according to claim 1, characterized in that: The first stuffing box (61) is provided with a first outer conical surface (611), and the first sealing ring (62) is provided with a first inner conical surface (621) close to the end surface corresponding to the valve head (2); The first outer conical surface (611) and the first inner conical surface (621) are in close contact with each other.

4. The anti-crystallization three-way valve according to claim 1, characterized in that: A second outer conical surface (21) is provided at one end of the valve head (2) close to the first valve stem assembly (5), and a second inner conical surface (612) is provided at one end of the first stuffing box (61) close to the corresponding valve head (2). The second outer conical surface (21) and the second inner conical surface (612) are capable of fitting together.

5. The anti-crystallization three-way valve according to claim 1, characterized in that: The self-flushing assembly (3) comprises a first flushing valve (31), a second flushing valve (32) and a third flushing valve (33); The valve body (1) is provided with a first channel (11), a second channel (12) and a third channel (13); the first channel (11) and the second channel (12) are respectively located on the movement paths of the two valve heads (2); and the first channel (11) and the second channel (12) can both be opened or closed by the corresponding valve head (2); The third channel (13) is arranged between the first channel (11) and the second channel (12); The first flushing valve (31) is arranged at one end of the first sealing assembly (6), and the first flushing valve (31) is in communication with the valve body (1); The second flushing valve (32) is close to one end of the second sealing assembly (7), and the second flushing valve (32) is in communication with the valve body (1); The third flushing valve (33) is arranged at the third channel (13), and the third flushing valve (33) is in communication with the valve body (1).

6. The anti-crystallization three-way valve according to claim 5, characterized in that: The first flush valve (31), the second flush valve (32), and the third flush valve (33) each comprise a flush valve stem (311) and a flush valve body (312); The flushing valve body (312) is provided with a flushing channel; The flushing valve stem (311) is arranged in the flushing valve body (312); The flushing valve body (312) is connected to the heating component (4); The flushing valve stem (311) is capable of opening or closing the flushing channel; The valve body (1) is provided with a through hole communicating with the flushing channel.

7. The anti-crystallization three-way valve according to claim 5, characterized in that: The heating component (4) comprises a first heat medium tube (41), a second heat medium tube (42) and a third heat medium tube (43); The first heat medium tube (41) is arranged outside the first channel (11), the second heat medium tube (42) is arranged outside the second channel (12), and the third heat medium tube (43) is arranged outside the third channel (13); A first heat medium baffle is provided at the connection between the third heat medium tube (43) and the first heat medium tube (41) for isolation, and a second heat medium baffle is provided at the connection between the third heat medium tube (43) and the second heat medium tube (42) for isolation; The first heat medium tube (41), the second heat medium tube (42) and the third heat medium tube (43) are each provided with an independent heat medium inlet (44) and a heat medium outlet (45).

8. The anti-crystallization three-way valve according to claim 1, characterized in that: The first valve stem assembly (5) comprises a first upper valve stem (51), a first lower valve stem (52), a first connecting sleeve (53), a first retaining ring (54), a first elastic retaining ring (55) and a first spherical pad (56); One end of the first upper valve stem (51) is connected to the first lower valve stem (52), and one end of the first lower valve stem (52) away from the first upper valve stem (51) is connected to the valve head (2); A first spherical pad (56) is further provided between the first upper valve stem (51) and the first lower valve stem (52); The first connecting sleeve (53) is sleeved on the outside of the first upper valve stem (51) and the first lower valve stem (52), and one end of the first connecting sleeve (53) is clamped with the first upper valve stem (51), and the other end is clamped with the first lower valve stem (52); The first retaining ring (54) is sleeved on the outside of the first connecting sleeve (53); One end of the first elastic retaining ring (55) abuts against the first connecting sleeve (53), and the other end abuts against the first retaining ring (54).

9. A method for operating an anti-crystallization three-way valve, characterized in that: The anti-crystallization three-way valve according to any one of claims 1 to 8 comprises the following steps: The first sealing assembly (6) includes a first sealing packing (65), a first packing pressure plate (66), a first packing pressure sleeve (67), a first lifting plate (68) and a first split ring (69); the first sealing packing (65) is arranged between the first valve stem assembly (5) and the first packing box (61); the first packing pressure sleeve (67) is sleeved on the outside of the first valve stem assembly (5), and the first packing pressure sleeve (67) abuts against the end face of the first sealing packing (65); the first packing pressure plate (66) is sleeved on the outside of the first valve stem assembly (5), and the first packing pressure plate (66) abuts against the end face of the first packing pressure sleeve (67); the first lifting plate (68) is sleeved on the outside of the first packing box (61), and the first packing pressure plate (66) abuts against the end face of the first packing pressure sleeve (67); the first lifting plate (68) is sleeved on the outside of the first packing box (61), and the first packing pressure plate (66) abuts against the end face of the first packing pressure sleeve (67). A lifting plate (68) is connected to the first stuffing pressure plate (66); the first split ring (69) is arranged between the first stuffing box (61) and the first lifting plate (68); the first stuffing box (61) is provided with a first outer conical surface (611), and the first sealing ring (62) is provided with a first inner conical surface (621) close to the end surface corresponding to the valve head (2); the first outer conical surface (611) and the first inner conical surface (621) are in contact with each other; a second outer conical surface (21) is provided at an end corresponding to the valve head (2) close to the first valve stem assembly (5), and a second inner conical surface (612) is provided at an end corresponding to the valve head (2); the second outer conical surface (21) and the second inner conical surface (612) are in contact with each other; The first sealing assembly (6) further includes a first fastener (691), and the first filler pressure plate (66) is connected to the first lifting plate (68) via the first fastener (691); S1: The valve corresponding to the first channel (11) is opened, and the first valve stem assembly (5) drives the corresponding valve head (2) to move toward the first stuffing box (61). At this time, the second outer conical surface (21) and the second inner conical surface (612) fit together, thereby sealing the first valve stem assembly (5) and the first stuffing box (61); Furthermore, the corresponding valve head (2) applies a force to the first stuffing box (61), so that the first stuffing box (61) squeezes the first sealing ring (62), and the first sealing ring (62) squeezes the first stuffing box (61) and the valve body (1) in the radial direction, thereby achieving good sealing; Opening the first heat medium pipe (41) to heat the medium passing through the first channel (11); S2: The valve corresponding to the first channel (11) is closed, and the first valve stem drives the corresponding valve head (2) to move away from the first stuffing box (61). At this time, the first flushing valve (31) is opened for online cleaning. The cleaning medium can exert a force on the first stuffing box (61), so that the first stuffing box (61) squeezes the first sealing ring (62). The first sealing ring (62) squeezes the first stuffing box (61) and the valve body (1) in the radial direction, thereby achieving a good seal. Closing the first heat medium pipe (41) to prevent energy waste; S3: During or after the operation of the valve to open or close the first channel (11), tighten the first fastener (691) to adjust and maintain the sealing preload of the first sealing packing (65) in the first sealing assembly (6).

10. The method for operating the anti-crystallization three-way valve according to claim 9, characterized in that: In step S3, when the first fastener (691) is tightened, the first packing pressure plate (66) transmits the pre-tightening force to the first packing pressing sleeve (67), and the first packing pressing sleeve (67) compresses the first sealing packing (65). The first sealing packing (65) is tightly fitted with the first valve stem assembly (5) and the first stuffing box (61), respectively, thereby achieving a good seal; At the same time, by tightening the first fastener (691), the first packing pressure plate (66) provides a force to the first lifting plate (68) in a direction away from the valve head (2). A first pair of split rings (69) is provided between the first lifting plate (68) and the first packing box (61). The first lifting plate (68) transmits the force to the first pair of split rings (69), and the first pair of split rings (69) transmits the force to the first packing box (61). At this time, the first packing box (61) can squeeze the first sealing packing (65) in a direction away from the valve head (2), thereby further making the first sealing packing (65) fit tightly with the first valve stem assembly (5) and the first packing box (61), respectively, to further achieve good sealing.

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