Anti-crystallization three-way valve and operation method

Abstract

The invention discloses an anti-crystallization three-way valve and an operation method, and the anti-crystallization three-way valve comprises a valve body, a valve head, a self-flushing assembly, a heating assembly, a first valve rod assembly, a first sealing assembly, a second sealing assembly and a second valve rod assembly; through movement of the first valve rod assembly and the second valve rod assembly, the opening and closing functions of the valve are achieved, and meanwhile good sealing of the three-way valve can be achieved. The technical problems that in the prior art, a three-way valve lacks an anti-crystallization device and method, the sealing effect is poor, the labor intensity is increased due to frequent disassembly and cleaning of crystals, and energy is wasted are solved. The crystallization problem of the three-way valve is solved in all directions from prevention of crystal generation to crystal cleaning, the technical effects of preventing the valve body from being crystallized and blocked and reliably sealing the valve body are achieved, energy is saved, and labor intensity is reduced.

Description

Technical Field

[0001] This application relates to the technical field of melamine valves, and particularly to an anti-crystallization three-way valve and an operation method thereof. Background Art

[0002] In a melamine production device, a three-way valve is an important component for controlling the flow direction and flow rate of materials. Since the medium in the melamine production process is extremely prone to crystallization under certain temperature, pressure, and residence time conditions, such as a material medium containing components such as melamine and urea. The crystallized material will adhere to the inner wall, valve core and other parts of the three-way valve, gradually accumulate and form blockages, resulting in the valve being unable to be opened and closed normally, affecting the transportation of materials and the normal operation of the production process.

[0003] The existing three-way valves have poor sealing effects and lack effective anti-crystallization measures. Although some valves use heating to prevent crystallization, the energy utilization rate is poor; the prior art also cleans the crystallization by regularly disassembling and cleaning the three-way valve. However, frequent disassembly not only increases the labor intensity and maintenance cost, but also easily causes damage to the valve seals, thus affecting the service life and sealing performance of the valve, and even may lead to production interruption and cause greater economic losses. Therefore, there is an urgent need to design an anti-crystallization three-way valve and an operation method to improve the continuity and stability of production. Summary of the Invention

[0004] By providing an anti-crystallization three-way valve and an operation method thereof, the embodiments of this application solve the technical problems in the prior art that the three-way valve lacks anti-crystallization devices and methods, has poor sealing effects, and frequent disassembly and cleaning of crystallization increase the labor intensity and cause energy waste.

[0005] In a first aspect, an embodiment of the present invention provides an anti-crystallization three-way valve, which includes a valve body, a valve head, a self-flushing assembly, a heating assembly, a first valve rod assembly, a first sealing assembly, a second sealing assembly, and a second valve rod assembly; the valve body is a hollow structure provided with an opening; the first valve rod assembly and the second valve rod assembly are oppositely arranged, and the opposite ends of the first valve rod assembly and the second valve rod assembly are both connected with the valve head, and the valve heads are both arranged inside the valve body; the first valve rod assembly and the second valve rod assembly are both configured to drive the corresponding valve head to slide inside the valve body; the first sealing assembly includes a first stuffing box, a first sealing ring, a first pressing ring, and a first pressing member; the first stuffing box is sleeved outside the first valve rod assembly and is clamped inside the valve body; 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 pressing ring is arranged between the first stuffing box and the valve body, and the first pressing ring abuts against the end of the first sealing ring away from the valve head; the first pressing member is arranged between the first stuffing box and the valve body, and the first pressing member abuts against the end of the first pressing ring away from the valve head; the second sealing assembly is arranged between the second valve rod 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 the crystallization inside 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 manner, the first sealing assembly includes a first sealing packing, a first packing pressing plate, a first packing pressing sleeve, a first lifting plate, and a first split ring; the first sealing packing is arranged between the first valve rod assembly and the first stuffing box; the first packing pressing sleeve is sleeved outside the first valve rod assembly, and the first packing pressing sleeve abuts against the end face of the first sealing packing; the first packing pressing plate is sleeved outside the first valve rod assembly, and the first packing pressing plate abuts against the end face of the first packing pressing sleeve; the first lifting plate is sleeved outside the first stuffing box, and the first lifting plate is connected to the first packing pressing plate; the first split ring is arranged between the first stuffing box and the first lifting plate.

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

[0008] In combination with the first aspect, in a possible implementation manner, 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 be fitted together.

[0009] In combination with the first aspect, in a possible implementation manner, 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 both 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 is communicated with the valve body; the second flush valve is close to one end of the second sealing assembly and is communicated with the valve body; the third flush valve is arranged at the third channel and is communicated with the valve body.

[0010] In combination with the first aspect, in a possible implementation manner, the first flush valve, the second flush valve, and the third flush valve each 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; a through hole communicated with the flush channel is provided on the valve body.

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

[0012] In combination with the first aspect, in a possible implementation manner, 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 circlip, and a first spherical washer; one end of the first upper valve stem is connected to the first lower valve stem, and a valve head is connected to the end of the first lower valve stem away from the first upper valve stem; a first spherical washer is further arranged between the first upper valve stem and the first lower valve stem; the first connecting sleeve is sleeved outside 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 outside the first connecting sleeve; one end of the first circlip abuts against the first connecting sleeve, and the other end thereof abuts against the first retaining ring.

[0013] In the second aspect, an operation method of the anti-crystallization three-way valve provided by an embodiment of the present invention is applicable to the anti-crystallization three-way valve as described in the first aspect or any possible implementation manner in combination with the first aspect, and includes the following steps: the first sealing assembly further includes a first fastener, and a first packing gland is connected to a 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 towards the direction close to the first stuffing box. At this time, the second outer conical surface fits with the second inner conical surface, and the first valve stem assembly and the first stuffing box can be sealed; moreover, the corresponding valve head applies a force to the first stuffing box, so that the first stuffing box presses the first sealing ring, and the first sealing ring presses the first stuffing box and the valve body respectively in the radial direction, thereby achieving good sealing; 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 on-line cleaning, and the cleaning medium can apply a force to the first stuffing box, so that the first stuffing box presses the first sealing ring, and the first sealing ring presses the first stuffing box and the valve body respectively in the radial direction, thereby achieving good sealing; Close the first heat medium pipe to prevent energy waste; S3: During or after the operation of opening or closing the first channel of the valve, tighten the first fastener to adjust and maintain the sealing pre-tightening force of the first sealing packing in the first sealing assembly.

[0014] Combined with the second aspect, in a possible implementation manner, in step S3, when the first fastener is tightened, the first packing pressing plate transmits the pre-tightening force to the first packing sleeve, and the first packing sleeve compresses the first sealing packing. The first sealing packing is in close contact with the first valve stem assembly and the first packing box respectively, so as to achieve good sealing. At the same time, by tightening the first fastener, the first packing pressing plate provides a force acting in a direction away from the valve head to the first lifting plate. A first split ring is arranged between the first lifting plate and the first packing box. The first lifting plate transmits the force to the first split ring, and the first split ring transmits the force to the first packing box. At this time, the first packing box can extrude the first sealing packing from the direction away from the valve head, so as to further make the first sealing packing in close contact with the first valve stem assembly and the first packing box respectively, and further achieve good sealing.

[0015] One or more technical solutions provided by the present application have at least the following technical effects: The embodiment of the present invention adopts an anti-crystallization three-way valve, including a valve body, a valve head, a self-flushing component, a heating component, a first valve stem component, a first sealing component, a second sealing component and a second valve stem component. By the movement of the first valve stem component and the second valve stem component, when realizing the functions of opening and closing the valve, good sealing of the first sealing component and the second sealing component can also be achieved, so as to effectively prevent the leakage of the medium. Its operation is simple and direct without complex tools or professional skills. The first valve stem component and the second valve stem component are convenient for staff to install, disassemble and maintain daily, so as to improve work efficiency and reduce maintenance costs.

[0016] The present application solves the technical problems in the prior art that the three-way valve lacks anti-crystallization devices and methods, has poor sealing effect, and frequent disassembly and cleaning of crystals increase the labor intensity and also cause energy waste. Through a clever sealing structure, good sealing of the valve can be achieved when it is opened and closed, and the crystals in the valve body can also be cleaned regularly. Also, through the way of zoning heating, energy is saved while preventing crystallization. The present application comprehensively deals with the crystallization problem of the three-way valve from preventing crystal formation to crystal cleaning, realizes the technical effect of preventing the valve body from being blocked by crystals and reliably sealing the valve body, saves energy, and reduces the labor intensity. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments of the present application or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0018] Figure 1Schematic diagram of a conventional three-way valve provided by an embodiment of the present application; Figure 2 Cross-sectional view of an anti-crystallization three-way valve provided by an embodiment of the present application; Figure 3 For Figure 2 Enlarged view of portion A; Figure 4 For Figure 2 Enlarged view of portion B; Figure 5 Cross-sectional view of a first valve stem assembly provided by an embodiment of the present application; Figure 6 For Figure 3 Enlarged view of portion C; Figure 7 For Figure 4 D-D cross-sectional view; Figure 8 Flowchart of an operation method of an anti-crystallization three-way valve provided by an embodiment of the present application.

[0019] Icons: 1 - valve body; 11 - first channel; 12 - second channel; 13 - third channel; 2 - valve head; 21 - second outer conical surface; 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 connecting sleeve; 54 - first retaining ring; 55 - first circlip; 56 - first spherical pad; 6 - first sealing assembly; 61 - first stuffing box; 611 - first outer conical surface; 612 - second inner conical surface; 62 - first sealing ring; 621 - first inner conical surface; 63 - first pressure ring; 64 - first pressing member; 65 - first sealing packing; 66 - first packing pressing plate; 67 - first packing pressing sleeve; 68 - first lifting plate; 69 - first split ring; 691 - first fastener; 7 - second sealing assembly; 8 - second valve stem assembly; 9 - handwheel. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0021] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. The terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. In addition, the terms "installed", "connected", "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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside 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 specific circumstances.

[0022] As Figure 1 shown, the conventional three-way valve lacks effective anti-crystallization measures. Although some valves use heating to prevent crystallization, the heating effect is uneven and the crystallization hidden danger cannot be completely eliminated; there is also a method of regularly disassembling and cleaning, but frequent disassembly not only increases the labor intensity and maintenance cost, but also easily causes damage to the valve seal, thus affecting the service life and sealing performance of the valve, and even may lead to production interruption and cause greater economic losses. Therefore, it is urgent to design an anti-crystallization three-way valve and an operation method to improve the continuity and stability of production.

[0023] The embodiment of the present invention provides an anti-crystallization three-way valve, as Figure 1-7As shown in the figure, it includes 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 oppositely, and valve heads 2 are connected to opposite ends of the first valve stem assembly 5 and the second valve stem assembly 8, and the valve heads 2 are both arranged inside 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 inside the valve body 1; the first sealing assembly 6 includes a first stuffing box 61, a first sealing ring 62, a first gland 63 and a first pressing member 64; the first stuffing box 61 is sleeved outside the first valve stem assembly 5 and is clamped inside 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 gland 63 is arranged between the first stuffing box 61 and the valve body 1, and the first gland 63 abuts against the 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 the end of the first gland 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 inside the valve body 1; a heating assembly 4 is arranged on the outside of the valve body 1, and the heating assembly 4 is configured to heat the valve body 1 in sections.

[0024] Exemplarily, the second sealing assembly 7 includes a second stuffing box, a second sealing ring, a second gland and a second pressing member; the second stuffing box is sleeved outside the second valve stem assembly 8 and is clamped inside 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 gland is arranged between the second stuffing box and the valve body 1, and the second gland 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 gland 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 inside the valve body 1 to prevent the medium from leaking and crystallizing.

[0025] Exemplarily, both the first valve stem assembly 5 and the second valve stem assembly 8 can slide inside the valve body 1, so as to open or close the first channel 11 and the second channel 12 by the valve. Third outer conical surfaces are arranged on opposite sides of the two valve heads 2, and a third inner conical surface is arranged inside the valve body 1. The third outer conical surface can fit with the third inner conical surface, so as to achieve good sealing when the valve is closed.

[0026] Exemplarily, through the movement of the first valve stem assembly 5 and the second valve stem assembly 8, the present application can achieve a good sealing effect of the first sealing assembly 6 and the second sealing assembly 7, and the first sealing assembly 6 and the second sealing assembly 7 can effectively prevent the medium from leaking.

[0027] Exemplarily, the present application 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, when the three-way valve is applied in some high-pressure and high-vacuum devices, it can meet strict sealing requirements. Through the movement of the first valve stem assembly 5 and the second valve stem assembly 8, while realizing the opening and closing functions of the valve, the present application can also achieve good sealing of the first sealing assembly 6 and the second sealing assembly 7, and its operation is simple and direct without the need for complex tools or professional skills.

[0028] Exemplarily, the three-way valve of the present application is convenient for staff to install, disassemble and perform daily maintenance, thereby improving work efficiency and reducing maintenance costs. Moreover, the first sealing assembly 6 and the second sealing assembly 7 can withstand mechanical vibration and impact without loosening or failure, thus ensuring the long-term stable operation of the three-way valve.

[0029] Exemplarily, handwheels 9 are connected to the ends of the first valve stem assembly 5 and the second valve stem assembly 8 away from the valve head 2.

[0030] In the embodiment of the present application, as Figure 1 shown, the first sealing assembly 6 includes a first sealing packing 65, a first packing pressing plate 66, a first packing sleeve 67, a first lifting plate 68 and a first split ring 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 outside 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 pressing plate 66 is sleeved outside the first valve stem assembly 5, and the first packing pressing plate 66 abuts against the end face of the first packing sleeve 67; the first lifting plate 68 is sleeved outside the first stuffing box 61, and the first lifting plate 68 is connected to the first packing pressing plate 66; the first split ring 69 is arranged between the first stuffing box 61 and the first lifting plate 68.

[0031] Exemplarily, 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.

[0032] Exemplarily, the first sealing packing 65, the first packing pressing plate 66, the first packing bush 67, the first lifting plate 68, and the first split ring 69 form a lifting type sealing mechanism, and this mechanism is operated by tightening the first fastener 691. When the first fastener 691 is tightened, the first packing pressing plate 66 transmits the pre-tightening force to the first packing bush 67, and the first packing bush 67 can compress the first sealing packing 65, so that the first sealing packing 65 is closely attached to 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 acting in a direction away from the valve head 2 to the first lifting plate 68, and a first split ring 69 is 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 split ring 69, and the first split ring 69 then transmits the force to the first stuffing box 61. At this time, the first stuffing box 61 can squeeze the first sealing packing 65 from a direction away from the valve head 2, so that the first sealing packing 65 is closely attached to the first valve stem assembly 5 and the first stuffing box 61 respectively, further realizing a good sealing effect.

[0033] In the embodiment of the present application, as Figure 1-7 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 fit.

[0034] In the embodiment of the present application, as Figure 1-7 shown, one end of the corresponding valve head 2 close to the first valve stem assembly 5 is provided with a second outer conical surface 21, and one end of the first stuffing box 61 close to the corresponding valve head 2 is provided with a second inner conical surface 612; the second outer conical surface 21 and the second inner conical surface 612 can be in fit.

[0035] In the embodiment of the present application, as Figure 1-7 shown, the self-flushing assembly 3 includes a first flush valve 31, a second flush valve 32, and a third flush 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 both the first channel 11 and the second channel 12 can 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 flush valve 31 is arranged at one end of the first sealing assembly 6 and is communicated with the valve body 1; the second flush valve 32 is close to one end of the second sealing assembly 7 and is communicated with the valve body 1; the third flush valve 33 is arranged at the third channel 13 and is communicated with the valve body 1.

[0036] In the embodiment of the present application, as Figure 1-7As shown, the first flushing valve 31, the second flushing valve 32, and the third flushing valve 33 all include a flushing valve stem 311 and a flushing valve body 312; a flushing channel is provided in the flushing valve body 312; the flushing valve stem 311 is arranged in the flushing valve body 312; the flushing valve body 312 is connected to the heating assembly 4; the flushing valve stem 311 can open or close the flushing channel; a through hole communicating with the flushing channel is provided on the valve body 1.

[0037] Exemplarily, 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 opens and performs the cleaning work inside the valve body 1. 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 opens and performs the cleaning work inside the valve body 1.

[0038] Exemplarily, the present application is provided with the first flushing valve 31, the second flushing valve 32, and the third flushing valve 33, which can respectively clean the inside of the valve body 1 at the first channel 11, the second channel 12, and the third channel 13 during the major overhaul of the pipeline. This setting method is convenient for later maintenance, thereby reducing the cleaning difficulty of the pipeline.

[0039] Exemplarily, hot medium pipelines are arranged on the outer sides of the first flushing valve 31, the second flushing valve 32, and the third flushing valve 33. When the valves of the first flushing valve 31, the second flushing valve 32, and the third flushing valve 33 are closed, the hot medium arranged on the outer side of the flushing valve at the closed position can suspend operation, thereby improving the energy utilization efficiency of the entire heating system. The hot medium pipeline on the outer side of the flushing valve is communicated with the hot medium pipe at the adjacent port, and the heat of the hot medium pipe can prevent the flushing medium from crystallizing due to temperature reduction.

[0040] Exemplarily, the first flushing valve 31 and the second flushing valve 32 are both arranged at two dead corner positions of the three-way valve, which is beneficial to removing the residual medium at the dead corner positions of the flushing valve body 312. The third flushing valve 33 is facing the third channel 13, which is convenient for flushing the residual medium at the third channel 13.

[0041] Exemplarily, 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 flow of the flushing medium and avoids the residual medium at the internal dead corners of the valve body 1 during flushing.

[0042] In the embodiment of the present application, as Figure 1 shown, the heating assembly 4 includes a first hot medium pipe 41, a second hot medium pipe 42, and a third hot medium pipe 43; the first hot medium pipe 41 is arranged on the outer side of the first channel 11, the second hot medium pipe 42 is arranged on the outer side of the second channel 12, and the third hot medium pipe 43 is arranged on the outer side of the third channel 13; 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; independent heat medium inlets 44 and heat medium outlets 45 are provided on the first heat medium pipe 41, the second heat medium pipe 42, and the third heat medium pipe 43.

[0043] Exemplarily, when the first channel 11 is closed, the first heat medium pipe 41 can pause circulation. Similarly, when the second channel 12 is closed, the second heat medium pipe 42 can pause circulation. This way can improve the energy utilization efficiency of the entire heating system.

[0044] Exemplarily, when any one of the first heat medium pipe 41, the second heat medium pipe 42, and the third heat medium pipe 43 needs to be maintained, repaired, or modified, this heat medium pipe can be isolated without affecting the normal operation of other heat medium pipes, thereby improving the operability and flexibility of the system and reducing the interference of heat medium pipe maintenance on the operation of the entire system. Moreover, the segmented design of the heat medium pipe can make the fault range easier to define. When problems occur in the system, it is possible to quickly determine which heat medium pipe has failed, facilitating the maintenance personnel to focus on troubleshooting and repair. This design shortens the fault handling time and also reduces the impact of system failures on production or life.

[0045] Exemplarily, 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 heat usage needs.

[0046] In the embodiment of the present application, as Figure 1-7 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 circlip 55, and a first spherical washer 56; one end of the first upper valve stem 51 is connected to the first lower valve stem 52, and a valve head 2 is connected to the end of the first lower valve stem 52 away from the first upper valve stem 51; a first spherical washer 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 outside the first upper valve stem 51 and the first lower valve stem 52, and one end of the first connecting sleeve 53 is snap-connected to the first upper valve stem 51, and the other end thereof is snap-connected to the first lower valve stem 52; the first retaining ring 54 is sleeved outside the first connecting sleeve 53; one end of the first circlip 55 abuts against the first connecting sleeve 53, and the other end thereof abuts against the first retaining ring 54.

[0047] Exemplarily, the first circlip 55 can prevent axial displacement between the first connecting sleeve 53 and the first retaining ring 54. The structures of the first valve stem assembly 5 and the second valve stem assembly 8 are the same.

[0048] Exemplarily, the first spherical gasket 56 can avoid 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 circlip 55 play a connecting role.

[0049] 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 the operation can be more flexible during the installation process, reducing the installation difficulty. For example, when the first upper valve stem 51 fails and needs to be repaired or replaced, it is not necessary 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.

[0050] Exemplarily, the split design can select different materials or perform special structural designs according to the force conditions of different parts of the first valve stem assembly 5. For example, the first upper valve stem 51 is made of a high-strength and wear-resistant material S51740, and the first lower valve stem 52 is made of Hastelloy C alloy that meets the melamine production working conditions. Such materials can not only ensure the overall strength and performance of the first valve stem assembly 5, but also reduce costs. At the same time, the split structure can relieve the stress concentration problem to a certain extent, thereby improving the fatigue resistance of the first valve stem assembly 5.

[0051] The embodiment of the present invention provides an operation method for an anti-crystallization three-way valve, which is applicable to an anti-crystallization three-way valve and includes the following steps: The first sealing assembly 6 further includes a first fastener 691, and the first packing gland 66 is connected to the first lifting plate 68 through the first fastener 691; S1: Open the valve corresponding to the first channel 11, and the first valve stem assembly 5 drives the corresponding valve head 2 to move towards the first stuffing box 61. At this time, the second outer conical surface 21 is in contact with the second inner conical surface 612, which can seal between the first valve stem assembly 5 and the first stuffing box 61; Moreover, the corresponding valve head 2 exerts a force on the first stuffing box 61, causing the first stuffing box 61 to squeeze 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 respectively, thereby achieving good sealing; Open the first heat medium pipe 41 to heat the medium passing through the first channel 11; S2: Close the valve corresponding to the first channel 11, and the first valve stem drives the corresponding valve head 2 to move away from the first stuffing box 61. At this time, open the first flushing valve 31 for on-line 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, and the first sealing ring 62 squeezes the first stuffing box 61 and the valve body 1 in the radial direction respectively, thereby achieving good sealing; Close the first heat medium pipe 41 to prevent energy waste; S3: During or after the process of operating 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 packing 65 in the first sealing assembly 6.

[0052] In the embodiment of the present application, as Figure 1 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 sleeve 67, the first packing sleeve 67 compresses the first sealing packing 65, and the first sealing packing 65 is in close contact with the first valve stem assembly 5 and the first packing box 61 respectively, so as to achieve good sealing; At the same time, by tightening the first fastener 691, the first packing pressing plate 66 provides a force acting in a direction away from the valve head 2 to the first lifting plate 68. A first split ring 69 is arranged between the first lifting plate 68 and the first packing box 61. The first lifting plate 68 transmits the force to the first split ring 69, and the first split ring 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 from a direction away from the valve head 2, so as to further make the first sealing packing 65 in close contact with the first valve stem assembly 5 and the first packing box 61 respectively, and further realize good sealing.

[0053] Exemplarily, the second sealing assembly 7 further includes a second fastener, and the second packing pressing plate is connected to the second lifting plate through 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 towards the direction close to the second packing box. At this time, the second outer conical surface 21 is in contact with the second inner conical surface 612, and can seal between the second valve stem assembly 8 and the second packing box; Moreover, the corresponding valve head 2 applies a force to the second packing box, so that the second packing box squeezes the second sealing ring, and the second sealing ring squeezes the second packing box and the valve body 1 respectively in the radial direction, so as to achieve good sealing; Open the second heat medium pipe 42 to heat the medium passing through the second channel 12; Close the valve corresponding to the second channel 12, and the second valve stem drives the corresponding valve head 2 to move away from the second packing box. At this time, open the second flushing valve 32 for on-line cleaning. The cleaning medium can apply a force to the second packing box, so that the second packing box squeezes the second sealing ring, and the second sealing ring squeezes the second packing box and the valve body 1 respectively in the radial direction, so as to achieve good sealing; Close the second heat medium pipe 42 to prevent energy waste; During or after the process of operating the valve to open or close the second channel 12, tighten the second fastener to adjust and maintain the sealing pre-tightening force of the second sealing packing in the second sealing assembly 7.

[0054] Exemplarily, when the second fastener is tightened, the second packing pressing plate transfers the pre-tightening force to the second packing sleeve, and the second packing sleeve compresses the second sealing packing. The second sealing packing is closely attached to the second valve stem assembly 8 and the second stuffing box respectively, so as to achieve good sealing. At the same time, by tightening the second fastener, the second packing pressing plate provides a force acting away from the valve head 2 to the second lifting plate. A second split ring is arranged between the second lifting plate and the second stuffing box. The second lifting plate transfers the force to the second split ring, and the second split ring transfers the force to the second stuffing box. At this time, the second stuffing box can extrude the second sealing packing from the direction away from the valve head 2, so as to further make the second sealing packing closely attached to the second valve stem assembly 8 and the second stuffing box respectively, and further achieve good sealing.

[0055] Exemplarily, in step S2, during the cleaning process, opening the first flushing valve 31 can make the cleaning medium flow into the valve body 1. At this time, the pressure of the cleaning medium helps to maintain the sealing state of the first sealing assembly 6. Specifically, the cleaning medium can apply a force to the first stuffing box 61, so that the first stuffing box 61 extrudes the first sealing ring 62. The first sealing ring 62 extrudes the first stuffing box 61 and the valve body 1 respectively in the radial direction, so as to achieve good sealing. Therefore, the first sealing assembly 6 can provide good sealing for the three-way valve when the valve is opened or closed, so as to prevent medium leakage.

[0056] Exemplarily, through special structural design and material selection, the present application can effectively avoid the crystallization and accumulation of the medium inside the valve, so as to ensure the normal opening and closing of the valve and the smooth flow of the medium fluid, and reduce equipment failures and production interruptions caused by crystallization blockage. Since the production environment of melamine has certain corrosiveness, this three-way valve is made of Hastelloy C alloy. Hastelloy C alloy has good corrosion resistance and wear resistance, which can extend the service life of the three-way valve, thereby reducing the maintenance cost of the equipment.

[0057] Exemplarily, the present application optimizes the sealing structure, which can effectively prevent the leakage of melamine fluid, not only avoiding material waste and environmental pollution, but also ensuring the safety of the production process.

[0058] Exemplarily, in the design of the present application, a valve stem structure that is easy to disassemble and assemble is considered, so as to facilitate maintenance personnel to carry out regular maintenance, overhaul and replacement of parts, which is beneficial to improving the maintainability of the equipment and reducing the shutdown maintenance time.

[0059] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, reference can be made to each other. The key point of each embodiment is to illustrate the differences from other embodiments.

[0060] The above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting the present application; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the present application.

Claims

1. A crystallization-proof three-way valve, characterized in that, 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 provided with an opening; The first valve stem component (5) and the second valve stem component (8) are arranged oppositely. At the opposite ends of the first valve stem component (5) and the second valve stem component (8), the valve head (2) is connected, and the valve head (2) is arranged inside the valve body (1); Both the first valve stem component (5) and the second valve stem component (8) are configured to drive the corresponding valve head (2) to slide inside the valve body (1); The first sealing component (6) includes a first stuffing box (61), a first sealing ring (62), a first gland (63) and a first pressing member (64); The first stuffing box (61) is sleeved outside the first valve stem component (5) and is clamped inside 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 gland (63) is arranged between the first stuffing box (61) and the valve body (1), and the first gland (63) abuts against the 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 the end of the first gland (63) away from the valve head (2); The second sealing component (7) is arranged between the second valve stem component (8) and the valve body (1); The self-flushing component (3) is connected to the outside of the valve body (1), and the self-flushing component (3) is configured to flush the crystallization inside the valve body (1); The heating component (4) is arranged 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 component (6) includes a first sealing packing (65), a first packing pressing plate (66), a first packing gland (67), a first lifting plate (68) and a first split ring (69); The first sealing packing (65) is arranged between the first valve stem component (5) and the first stuffing box (61); The first packing gland (67) is sleeved outside the first valve stem component (5), and the first packing gland (67) abuts against the end face of the first sealing packing (65); The first packing pressing plate (66) is sleeved outside the first valve stem component (5), and the first packing pressing plate (66) abuts against the end face of the first packing gland (67); The first lifting plate (68) is sleeved outside the first stuffing box (61), and the first lifting plate (68) is connected to the first packing pressing 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, wherein 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) near the end face corresponding to the valve head (2); The first outer conical surface (611) and the first inner conical surface (621) are in fit.

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 rod assembly (5), and a second inner conical surface (612) is provided at one end of the first stuffing box (61) corresponding to the valve head (2); The second outer conical surface (21) and the second inner conical surface (612) can be in fit.

5. The anti-crystallization three-way valve according to claim 1, characterized in that, The self-flushing assembly (3) includes a first flush valve (31), a second flush valve (32) and a third flush 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 both the first channel (11) and the second channel (12) can 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 flush valve (31) is arranged at one end of the first sealing assembly (6), and the first flush valve (31) is communicated with the valve body (1); The second flush valve (32) is close to one end of the second sealing assembly (7), and the second flush valve (32) is communicated with the valve body (1); The third flush valve (33) is arranged at the third channel (13), and the third flush valve (33) is communicated 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) all include a flush valve rod (311) and a flush valve body (312); The flush valve body (312) is provided with a flush channel; The flush valve rod (311) is arranged in the flush valve body (312); The flush valve body (312) is connected to the heating assembly (4); The flush valve rod (311) can open or close the flush channel; The valve body (1) is provided with a through hole communicated with the flush channel.

7. The anti-crystallization three-way valve according to claim 5, characterized in that, The heating assembly (4) includes a first heat medium pipe (41), a second heat medium pipe (42) and a third heat medium pipe (43); The first heat medium pipe (41) is arranged outside the first channel (11), the second heat medium pipe (42) is arranged outside the second channel (12), and the third heat medium pipe (43) is arranged outside the third channel (13); A first heat medium baffle is arranged at the connection of the third heat medium pipe (43) and the first heat medium pipe (41) for isolation, and a second heat medium baffle is arranged at the connection of the third heat medium pipe (43) and the second heat medium pipe (42) for isolation; Independent heat medium inlets (44) and heat medium outlets (45) are provided on the first heat medium pipe (41), the second heat medium pipe (42) and the third heat medium pipe (43).

8. The anti-crystallization three-way valve according to claim 1, characterized in that, 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 circlip (55), and a first spherical washer (56); One end of the first upper valve stem (51) is connected to the first lower valve stem (52), and the valve head (2) is connected to the end of the first lower valve stem (52) away from the first upper valve stem (51); A first spherical washer (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 outside the first upper valve stem (51) and the first lower valve stem (52), and one end of the first connecting sleeve (53) is snap-connected to the first upper valve stem (51), and the other end thereof is snap-connected to the first lower valve stem (52); The first retaining ring (54) is sleeved outside the first connecting sleeve (53); One end of the first circlip (55) abuts against the first connecting sleeve (53), and the other end thereof abuts against the first retaining ring (54).

9. A method for operating an anti-crystallization three-way valve, characterized in that, Applicable to the anti-crystallization three-way valve according to any one of claims 1-8, comprising the following steps: The first sealing assembly (6) includes a first sealing packing (65), a first packing pressing plate (66), a first packing 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 sleeve (67) is sleeved outside 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 pressing plate (66) is sleeved outside the first valve stem assembly (5), and the first packing pressing plate (66) abuts against the end face of the first packing sleeve (67); the first lifting plate (68) is sleeved outside the first stuffing box (61), and the first lifting plate (68) is connected to the first packing pressing plate (66); the first split ring (69) is provided 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) at the end face close to the corresponding valve head (2); the first outer conical surface (611) and the first inner conical surface (621) are fitted; 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 be fitted; The first sealing assembly (6) further includes a first fastener (691), and the first packing pressing plate (66) is connected to the first lifting plate (68) through the first fastener (691); S1: Open the valve corresponding to the first channel (11). The first valve stem assembly (5) drives the corresponding valve head (2) to move towards the first stuffing box (61). At this time, the second outer conical surface (21) fits with the second inner conical surface (612), enabling sealing between the first valve stem assembly (5) and the first stuffing box (61). Moreover, the corresponding valve head (2) applies a force to 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) respectively in the radial direction, thereby achieving good sealing. Open the first heat medium pipe (41) to heat the medium passing through the first channel (11). S2: Close the valve corresponding to the first channel (11). The first valve stem drives the corresponding valve head (2) to move away from the first stuffing box (61). At this time, open the first flushing valve (31) for on-line cleaning. The cleaning medium can apply a force to 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) respectively in the radial direction, thereby achieving good sealing. Close the first heat medium pipe (41) to prevent energy waste. S3: During or after operating 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 packing (65) in the first sealing assembly (6).

10. The operation method of the anti-crystallization three-way valve according to claim 9, characterized in that in step S3, when tightening the first fastener (691), the first packing pressing plate (66) transmits the pre-tightening force to the first packing sleeve (67). The first packing sleeve (67) compresses the first sealing packing (65). The first sealing packing (65) fits tightly with the first valve stem assembly (5) and the first stuffing box (61) respectively, thereby achieving good sealing. Meanwhile, by tightening the first fastener (691), the first packing pressing plate (66) provides a force in the direction away from the valve head (2) to the first lifting plate (68). A first split ring (69) is provided between the first lifting plate (68) and the first stuffing box (61). The first lifting plate (68) transmits the force to the first split ring (69). The first split ring (69) transmits 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, and further achieving good sealing.

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