Three-way valve, drainage system and ship

Abstract

The invention relates to the technical field of three-way valves and discloses a three-way valve, a drainage system and a ship, the three-way valve comprises a valve body, a valve element and three valve seats, and the valve body is provided with two water outlet valve ports communicating with a valve cavity and a water inlet valve port communicating with the valve cavity in the circumferential direction of the valve body; the valve element is provided with a first flow channel, and the valve element is rotatably arranged in the valve cavity so that the first flow channel can be connected with the water inlet valve opening and any water outlet valve opening. Each valve seat is in sealing fit with the valve core; wherein the three valve seats comprise a first valve seat and two second valve seats, the first valve seat is arranged at the water inlet valve port, each second valve seat is arranged at the corresponding water outlet valve port, a flow guide gap is formed between the first valve seat and the water inlet valve port, and a first sealing part is arranged between the second valve seat and the corresponding water outlet valve port. The technical problems that in the flow path switching steering process of a valve element of the three-way valve, fluid medium force can increase the steering torque of the valve element, torsional force needed when the valve element steers is increased, and the valve element is prone to being damaged are solved.

Description

Technical Field

[0001] The present application relates to the technical field of three-way valves, and particularly to a three-way valve, a drainage system, and a ship. Background Art

[0002] In many fields such as waterborne navigation, building water supply and drainage, and heating, ventilation, and air conditioning, a three-way valve, as an important fluid control component, plays a crucial role. Its main function is to achieve the switching of fluid flow direction and the distribution of flow rate.

[0003] In the related art, when the fluid flows through the valve core, it will generate a fluid medium force in the direction perpendicular to the axis of rotation of the valve core. During the process of the valve core of the three-way valve switching the flow path direction, the fluid medium force will increase the steering torque of the valve core, the torsional force required for the valve core to turn increases, and the valve core is easily damaged. Summary of the Invention

[0004] The present application provides a three-way valve, a drainage system, and a ship, which solve the technical problem that during the process of the valve core of the three-way valve switching the flow path direction, the fluid medium force will increase the steering torque of the valve core, the torsional force required for the valve core to turn increases, and the valve core is easily damaged.

[0005] To achieve the above object, the main technical solutions adopted in the present application include: In a first aspect, an embodiment of the present application provides a three-way valve. The three-way valve includes a valve body, a valve core, and three valve seats. A valve cavity is provided in the valve body. Along the circumferential direction of the valve body, the valve body is provided with two water outlet valve ports communicating with the valve cavity and one water inlet valve port communicating with the valve cavity; the valve core has a first flow path, and the valve core is rotatably arranged in the valve cavity so that the first flow path connects the water inlet valve port and any one of the water outlet valve ports; each valve seat is correspondingly arranged at the water outlet valve port and the water inlet valve port, and each valve seat is in sealing cooperation with the valve core; among them, the three valve seats include one first valve seat and two second valve seats. The first valve seat is arranged at the water inlet valve port, a diversion gap is arranged between the first valve seat and the water inlet valve port, and a first sealing portion is arranged between the second valve seat and the corresponding water outlet valve port.

[0006] In the three-way valve proposed by the embodiment of the present application, a diversion gap is arranged between the first valve seat and the water inlet valve port, so that the pressure difference at both ends of the second valve seats of the other two water outlet valve ports is relatively small. Furthermore, when the valve core turns, the torsional force required for the valve core can be reduced, energy consumption can be reduced, and moreover, the friction between the valve core and the valve seat can be reduced, and the probability of the valve core being damaged can be lowered. A first sealing portion is arranged between the second valve seat and the corresponding water outlet valve port, so that it can be ensured that any one of the water outlet valve ports is tightly sealed when it is in the closed state, preventing backflow or leakage.

[0007] Optionally, the second valve seat includes a body portion and a protrusion portion. Along the axial direction of the water outlet valve port, the body portion has a first end face and a second end face arranged oppositely. The first end face faces the valve core and is in sealing contact with the valve core. The protrusion portion is arranged on the second end face, and a first sealing portion is arranged between the protrusion portion and the inner wall of the water outlet valve port; the three-way valve further includes a first accommodation space located between the body portion and the inner wall of the water outlet valve port and between the body portion and the first sealing portion. The first accommodation space communicates with the valve cavity, and a part of the second end face is located in the first accommodation space.

[0008] The first accommodation space is located between the body portion and the inner wall of the water outlet valve port and between the body portion and the first sealing portion. The first accommodation space communicates with the valve cavity, and a part of the second end face is located in the first accommodation space. This can reduce the probability of the second valve seat detaching from the valve core, improve the sealing performance between the second valve seat and the valve core, reduce the probability of fluid leakage, and improve the stability and reliability of the operation of the three-way valve.

[0009] Optionally, the first end face includes a first part and a second part. The first part is in sealing cooperation with the valve core, and the second part is located in the valve cavity. The second end face includes a third part and a fourth part. The protrusion portion is arranged on the third part, and the fourth part is located in the first accommodation space. Along the axial direction of the water outlet valve port, the projected area of the fourth part is larger than the projected area of the second part.

[0010] Along the axial direction of the water outlet valve port, the projected area of the fourth part is larger than the projected area of the second part. The second valve seat can always be in close contact with the valve core, ensuring the sealing performance between the valve core and the second valve seat, reducing the probability of fluid leakage of the three-way valve, and improving the stability and reliability of the operation of the three-way valve.

[0011] Optionally, the three-way valve further includes a first limiting member fixed to one end of the water outlet valve port away from the valve core. Along the axial direction of the water outlet valve port, the first limiting member abuts against the first sealing portion.

[0012] Along the axial direction of the water outlet valve port, the first limiting member abuts against the first sealing portion, ensuring that the sealing sleeve is in the correct position and can continuously provide axial pressure for the first sealing portion to maintain a good sealing effect.

[0013] Optionally, the three-way valve further includes a valve cover. The valve body has a first groove, and the valve cover has a second groove. Along the rotation axis direction of the valve core, the first groove and the second groove are arranged oppositely. The valve core has a first shaft and a second shaft. The first shaft is rotatably arranged in the first groove, and the second shaft is rotatably arranged in the second groove. The three-way valve further includes a valve rod rotatably connected to the valve cover, and the valve rod is connected to the second shaft.

[0014] The first shaft is rotatably arranged in the first groove, and the second shaft is rotatably arranged in the second groove. In this way, the lateral force of the fluid medium on the valve core will be transmitted to the valve body or the valve cover. The valve stem only provides the torque for the rotation of the valve core and does not bear the radial medium force, reducing the local compression of the valve stem, reducing the friction force on the valve stem, thereby reducing the situation where the valve stem is easily damaged and fails, and improving the reliability of the switching action of the three-way valve.

[0015] Optionally, the three-way valve further includes a first shaft sleeve and a second shaft sleeve. The first shaft sleeve is arranged between the inner wall of the first groove and the outer peripheral surface of the first shaft, and the second shaft sleeve is arranged between the inner wall of the second groove and the outer peripheral surface of the second shaft.

[0016] During the rotation of the valve core, the first shaft sleeve and the second shaft sleeve can bear the main friction and wear, reduce the wear between the first shaft and the first groove and between the second shaft and the second groove, and extend the service life of the key components of the three-way valve.

[0017] Optionally, the valve cover has a first hole, and the valve stem is rotatably arranged in the first hole. The first hole includes a first section and a second section. The inner diameter of the first section is smaller than that of the second section. The first section is closer to the valve core than the second section. Two first grooves are arranged on the inner peripheral surface of the first section. Along the axial direction of the first section, the two first grooves are spaced apart; a sealing ring and a first retaining ring are arranged in the first groove. The sealing ring abuts against the outer peripheral surface of the valve stem and the inner peripheral surface of the first section. Along the axial direction of the first section, the sealing ring abuts against the first retaining ring.

[0018] The two first grooves are spaced apart; a sealing ring and a first retaining ring are arranged in the first groove. The sealing ring abuts against the outer peripheral surface of the valve stem and the inner peripheral surface of the first section. Such a double-sealing structure greatly improves the sealing effect between the valve stem and the valve cover. Even if one sealing ring is slightly damaged or its sealing performance deteriorates, the other sealing ring can still play a sealing role, effectively preventing the fluid from leaking from the gap between the valve stem and the valve cover.

[0019] Optionally, the three-way valve further includes a first pressing component and a first packing part. The first pressing component is sleeved on the valve stem and fixedly connected to the valve cover. The first packing part is arranged between the inner peripheral surface of the second section and the outer peripheral surface of the valve stem. Along the axial direction of the valve stem, the two ends of the first packing part respectively abut against the first pressing component and one end of the first section.

[0020] The first packing part is arranged between the inner peripheral surface of the second section and the outer peripheral surface of the valve stem. In this way, the sealing effect between the valve stem and the valve cover can be improved. When the sealing ring fails, it can seal the gap between the valve cover and the valve stem, improving the stability and reliability during the operation of the three-way valve.

[0021] Optionally, the first pressure component includes a first pressing plate and a packing bush. The valve stem passes through the first pressing plate and the packing bush. The first pressing plate is fixedly connected to the valve cover through a fastener. Along the axial direction of the second section, the packing bush is located between the first pressing plate and the first packing part and abuts against the first pressing plate and the first packing part respectively.

[0022] The packing bush is located between the first pressing plate and the first packing part and abuts against the first pressing plate and the first packing part respectively. The packing bush can generate pressure on the first packing part, thereby realizing the adjustment of the sealing performance between the valve stem and the valve cover, and improving the stability and reliability of the operation of the three-way valve.

[0023] In a second aspect, an embodiment of the present application provides a drainage system, including the three-way valve according to any one of the embodiments of the present application.

[0024] In the ship provided by the embodiment of the present application, a diversion gap is provided between the first valve seat and the water inlet valve port, so that the pressure difference between the two ends of the second valve seat of the other two water outlet valve ports is relatively small. Thus, when the valve core turns, the torsional force required for the valve core can be reduced, the energy consumption can be reduced, and the friction between the valve core and the valve seat can also be reduced, reducing the probability of damage to the valve core. A first sealing part is provided between the second valve seat and the corresponding water outlet valve port, so as to ensure tight sealing when any one of the water outlet valve ports is in the closed state, preventing backflow or leakage.

[0025] In a third aspect, an embodiment of the present application provides a ship, including the drainage system according to any one of the embodiments of the present application.

[0026] In the ship provided by the embodiment of the present application, a diversion gap is provided between the first valve seat and the water inlet valve port, so that the pressure difference between the two ends of the second valve seat of the other two water outlet valve ports is relatively small. Thus, when the valve core turns, the torsional force required for the valve core can be reduced, the energy consumption can be reduced, and the friction between the valve core and the valve seat can also be reduced, reducing the probability of damage to the valve core. A first sealing part is provided between the second valve seat and the corresponding water outlet valve port, so as to ensure tight sealing when any one of the water outlet valve ports is in the closed state, preventing backflow or leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0028] Figure 1 It is a schematic cross-sectional view of the three-way valve provided by the embodiment of the present application; Figure 2 The structure of the water inlet valve port of the three-way valve is shown; Figure 3 A horizontal cross-sectional view of the three-way valve provided by the embodiment of the present application; Figure 4 A horizontal cross-sectional view of the three-way valve provided by another embodiment of the present application; Figure 5 A partial enlarged view of the sealing structure between the valve stem and the valve cover provided by the embodiment of the present application; Figure 6 A partial enlarged view of the water outlet valve port and the second valve seat provided by the embodiment of the present application; Figure 7 Shows the first limiting groove and the first limiting protrusion; Figure 8 A schematic structural diagram of the ship provided by the embodiment of the present application.

[0029]

Description of the drawings reference numerals

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of this application.

[0031] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification, claims, and drawings of this application are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification, claims, or drawings of this application are used to distinguish different objects and not to describe a specific order or primary-secondary relationship.

[0032] Referring to "embodiments" in this application means that specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appearing in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those of ordinary skill in the art explicitly and implicitly understand that the embodiments described in this application can be combined with other embodiments.

[0033] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "coupled", and "attached" 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 directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] The term "and / or" in this application is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally represents an "or" relationship between the associated objects before and after.

[0035] The term "plurality" as used in this application refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0036] In many fields such as waterborne navigation, building water supply and drainage, and heating, ventilation and air conditioning, the three-way valve, as an important fluid control component, plays a crucial role. Its main function is to achieve the switching of fluid flow direction and the distribution of flow rate.

[0037] In the related art, when the fluid flows through the valve core at a high speed, due to the change of fluid momentum, a relatively significant impact force will be generated in the direction perpendicular to the axis of rotation of the valve core. During the process of the valve core of the three-way valve switching the flow path direction, the impact force will greatly increase the steering torque of the valve core, the torsional force required for the valve core to turn increases, which increases the energy consumption. Under the long-term high-load impact, the friction between the valve core and the valve seat will increase, and it is easy to cause damage to the valve core.

[0038] In view of this, the embodiments of the present application propose a three-way valve, a drainage system and a ship. The three-way valve includes a valve body, a valve core and three valve seats. A valve cavity is provided in the valve body. Along the circumferential direction of the valve body, the valve body is provided with two water outlet valve ports communicated with the valve cavity and an inlet valve port communicated with the valve cavity; the valve core has a first flow path, and the valve core is rotatably arranged in the valve cavity so that the first flow path is connected to the inlet valve port and any one of the water outlet valve ports; each valve seat is correspondingly arranged at the water outlet valve port and the inlet valve port, and each valve seat is in sealing cooperation with the valve core; wherein, the three valve seats include a first valve seat and two second valve seats. The first valve seat is arranged at the inlet valve port, each second valve seat is arranged at the corresponding water outlet valve port, a diversion gap is arranged between the first valve seat and the inlet valve port, and a first sealing portion is arranged between the second valve seat and the corresponding water outlet valve port.

[0039] In the above solution, a diversion gap is arranged between the first valve seat and the inlet valve port, so that the pressure difference at both ends of the second valve seats of the other two water outlet valve ports is relatively small. Thus, when the valve core turns, the torsional force required for the valve core can be reduced, the energy consumption can be reduced, and the friction between the valve core and the valve seat can also be reduced, reducing the probability of damage to the valve core. A first sealing portion is arranged between the second valve seat and the corresponding water outlet valve port, which can ensure tight sealing when any one of the water outlet valve ports is in the closed state, preventing backflow or leakage.

[0040] The sealing ring disclosed in the embodiments of the present application can be constructed of PEEK material, with a small friction coefficient, effectively improving the strength and toughness of the sealing ring.

[0041] The surface of the valve core disclosed in the embodiments of the present application can be nitrided, with a hardness ≥700HV, and after surface polishing, it has excellent properties such as corrosion resistance and wear resistance.

[0042] For the convenience of description, the following embodiments are described by taking the three-way valve of an embodiment of the present application as an example.

[0043] Figure 1 It is a schematic cross-sectional view of the three-way valve provided by the embodiments of the present application; Figure 2Shows the structure of the water inlet valve port of the three-way valve; Figure 3 Is a horizontal cross-sectional view of the three-way valve provided by the embodiment of the present application; Figure 4 Is a horizontal cross-sectional view of the three-way valve provided by another embodiment of the present application; 5 is a partial enlarged view of the sealing structure between the valve stem and the valve cover provided by the embodiment of the present application; Figure 6 Is a partial enlarged view of the water outlet valve port and the second valve seat provided by the embodiment of the present application; Figure 7 Shows the first limiting groove and the first limiting protrusion; Figure 8 Is a schematic structural diagram of the ship provided by the embodiment of the present application.

[0044] Please refer to Figures 1 to 4 , in this embodiment, the three-way valve 1000 includes a valve body 100, a valve core 290 and three valve seats. A valve cavity 110 is provided in the valve body 100. Along the circumferential direction of the valve body 100, the valve body 100 is provided with two water outlet valve ports 120 communicating with the valve cavity 110 and one water inlet valve port 130 communicating with the valve cavity 110; the valve core 290 has a first flow channel 291, and the valve core 290 is rotatably arranged in the valve cavity 110 so that the first flow channel 291 connects the water inlet valve port 130 and any one of the water outlet valve ports 120; each valve seat is correspondingly arranged at the water outlet valve port 120 and the water inlet valve port 130, and each valve seat is in sealing cooperation with the valve core 290; wherein, the three valve seats include a first valve seat 140 and two second valve seats 150, the first valve seat 140 is arranged at the water inlet valve port 130, each second valve seat 150 is arranged at the corresponding water outlet valve port 120, a diversion gap 141 is arranged between the first valve seat 140 and the water inlet valve port 130, and a first sealing portion 160 is arranged between the second valve seat 150 and the corresponding water outlet valve port 120.

[0045] A valve cavity 110 is provided in the valve body 100, the valve core 290 is arranged in the valve cavity 110. Along the circumferential direction of the valve body 100, the valve body 100 is further provided with two water outlet valve ports 120 and one water inlet valve port 130. Along the axial direction of the water outlet valve port 120, the two water outlet valve ports 120 can be arranged oppositely, and the axial direction of one water inlet valve port 130 and the axial direction of the water outlet valve port 120 can be perpendicular to each other.

[0046] The valve core 290 is provided with a first flow channel 291, and the valve core 290 is rotatably arranged in the valve cavity 110. That is to say, the first flow channel 291 can rotate in the valve cavity 110. One end of the first flow channel 291 can be connected to the water inlet valve port 130, and the other end of the first flow channel 291 can be connected to any one of the water outlet valve ports 120. During the operation of the three-way valve 1000, the fluid can enter the first flow channel 291 from the water inlet valve port 130, then exit the first flow channel 291 and exit the three-way valve 1000 from the water outlet valve port 120, thereby completing the switching of the fluid flow direction.

[0047] Valve seats are provided on both two water outlet valve ports 120 and one water inlet valve port 130. The valve seats are in sealing cooperation with the valve cores 290. In this way, when the fluid flows from the through holes in the valve seats to the inside of the valve cores 290, the fluid will not leak between the valve seats and the valve cores 290, improving the efficiency of fluid diversion.

[0048] The three valve seats include a first valve seat 140 and two second valve seats 150. The first valve seat 140 is arranged at the water inlet valve port 130, and the two second valve seats 150 are respectively arranged at the corresponding water outlet valve ports 120. A diversion gap 141 is provided between the first valve seat 140 and the water inlet valve port 130. That is to say, when the fluid enters the three-way valve 1000 from the water inlet valve port 130, the fluid will enter the valve cavity 110 through the diversion gap 141 between the first valve seat 140 and the water inlet valve port 130. The fluid entering the valve cavity 110 will contact the valve core 290. The valve cavity 110 is communicated with the outside through the diversion gap 141. The fluid in the valve cavity 110 will generate a supporting force on the valve core 290. The supporting force and the impact force of the water inlet valve port 130 and the water outlet valve ports 120 on the valve core 290 will offset a part, making the pressure difference between the two ends of the second valve seats 150 of the other two water outlet valve ports 120 smaller. Furthermore, when the valve core 290 turns, the torsional force required by the valve core 290 can be reduced, the energy consumption can be reduced, and the friction between the valve core 290 and the valve seat can also be reduced, reducing the probability of damage to the valve core 290.

[0049] A first sealing portion 160 is provided between the second valve seat 150 and the corresponding water outlet valve port 120. Exemplarily, the first sealing portion 160 can be configured as a sealing ring 250 or a sealing sleeve. The first sealing portion 160 blocks the gap between the second valve seat 150 and the water outlet valve port 120, preventing the fluid in the water outlet valve port 120 from flowing into the valve cavity 110 between the second valve seat 150 and the water outlet valve port 120, and also preventing the liquid in the valve cavity 110 from entering the water outlet valve port 120 through the gap between the second valve seat 150 and the water outlet valve port 120. In this way, it can ensure that any water outlet valve port 120 is tightly sealed when it is in the closed state, preventing backflow or leakage.

[0050] Please refer to Figures 1 to 4, in this embodiment, the second valve seat 150 includes a body portion 151 and a protrusion portion 154. Along the axial direction of the water outlet valve port 120, the body portion 151 has a first end face 152 and a second end face 153 that are oppositely arranged. The first end face 152 faces the valve core 290 and is in sealing contact with the valve core 290. The protrusion portion 154 is arranged on the second end face 153, and a first sealing portion 160 is arranged between the protrusion portion 154 and the inner wall of the water outlet valve port 120. The three-way valve 1000 further includes a first accommodation space 170. The first accommodation space 170 is located between the body portion 151 and the inner wall of the water outlet valve port 120 and between the body portion 151 and the first sealing portion 160. The first accommodation space 170 communicates with the valve cavity 110, and a part of the second end face 153 is located in the first accommodation space 170.

[0051] The second valve seat 150 includes a body portion 151 and a protrusion portion 154. The body portion 151 has a first end face 152 and a second end face 153. The first end face 152 faces the valve core 290. Exemplarily, a sealing ring 250 is arranged between the first end face 152 and the valve core 290 to prevent fluid from leaking at the position where the first end face 152 contacts the valve core 290, improving the sealing performance of the three-way valve 1000. The protrusion portion 154 is arranged on the second end face 153, and a first sealing portion 160 is arranged between the protrusion portion 154 and the inner wall of the water outlet valve port 120. Along the radial direction of the water outlet valve port 120, the first sealing portion 160 is in contact with the inner wall of the water outlet valve port 120 and the protrusion portion 154 respectively. The first sealing portion 160 can seal the gap between the protrusion portion 154 and the inner wall of the water outlet valve port 120, preventing the fluid in the water outlet valve port 120 from flowing into the valve cavity 110 through the gap between the first sealing portion 160 and the water outlet valve port 120, or preventing the fluid in the valve cavity 110 from flowing into the water outlet valve port 120 through the gap between the first sealing portion 160 and the water outlet valve port 120.

[0052] The three-way valve 1000 further includes a first accommodation space 170. The first accommodation space 170 communicates with the valve cavity 110, and the fluid in the valve cavity 110 can flow into the first accommodation space 170. That is to say, the fluid can contact the second end face 153 of the second valve seat 150. Since the valve core 290 is in sealing contact with the first end face 152, exemplarily, along the axial direction of the water outlet valve port 120, when the pressure of the fluid medium in the water outlet valve port 120 on the second valve seat 150 is greater than the pressure of the fluid medium in the valve cavity 110 on the second valve seat 150, at this time, the second valve seat 150 receives a force towards the valve core 290, and the second valve seat 150 can be closely attached to the valve core 290; When the pressure of the fluid medium at the water outlet valve port 120 on the second valve seat 150 is less than the pressure of the fluid medium in the valve cavity 110 on the second valve seat 150 along the axial direction of the water outlet valve port 120, since the fluid medium can enter the first accommodation space 170 at this time, the fluid medium in the first accommodation space 170 will squeeze the first sealing portion 160, and the first sealing portion 160 will give the fluid medium in the first accommodation space 170 a pressure towards the valve core 290. Thus, even if the pressure of the fluid medium in the valve cavity 110 on the second valve seat 150 is greater than the pressure of the fluid medium in the water outlet valve port 120 on the second valve seat 150, due to the first accommodation space 170 being in communication with the valve cavity 110, the pressure generated by the fluid medium in the first accommodation space 170 can offset part of the pressure of the fluid medium in the valve cavity 110 on the second valve seat 150. Exemplarily, along the axial direction of the water outlet valve port 120 and towards the direction away from the valve cavity 110, the pressure of the fluid medium in the valve cavity 110 on the second valve seat 150 can be 10 kN, and along the axial direction of the water outlet valve port 120 and towards the valve cavity 110, the pressure of the fluid medium in the water outlet valve port 120 on the second valve seat 150 can be 5 kN. However, due to the first accommodation space 170 being in communication with the valve cavity 110, along the axial direction of the water outlet valve port 120 and towards the valve cavity 110, the pressure of the fluid medium in the first accommodation space 170 on the second valve seat 150 can be 6 kN. Then, the second valve seat 150 is generally subjected to a force of 1 kN towards the valve cavity 110 in the axial direction of the water outlet valve port 120. Along the axial direction of the water outlet valve port 120, the second valve seat 150 still moves towards the valve core 290, and the second valve seat 150 and the valve core 290 can always be in close fit, which can improve the sealing performance between the second valve seat 150 and the valve core 290, reduce the probability of fluid leakage, and improve the stability and reliability of the operation of the three-way valve 1000.

[0053] In some embodiments, please refer to Figure 3 and Figure 4 , when the valve core 290 rotates, the position of the first flow channel 291 will also change correspondingly, thereby changing the direction of fluid flow.

[0054] Please refer to Figures 1 to 4 , in this embodiment, the first end face 152 includes a first part 152A and a second part 152B. The first part 152A is in sealing cooperation with the valve core 290, and the second part 152B is located in the valve cavity 110. The second end face 153 includes a third part 153A and a fourth part 153B. A convex portion 154 is provided on the third part 153A, and the fourth part 153B is located in the first accommodation space 170. Along the axial direction of the water outlet valve port 120, the projected area of the fourth part 153B is larger than the projected area of the second part 152B.

[0055] The first end face 152 includes a first portion 152A and a second portion 152B. The first portion 152A is in sealing fit with the valve core 290. The second portion 152B is located in the valve cavity 110 and contacts the fluid medium in the valve cavity 110. The junction of the first portion 152A and the second portion 152B is the sealing diameter between the valve core 290 and the second valve seat 150. The second end face 153 includes a third portion 153A and a fourth portion 153B. The convex portion 154 is provided on the third portion 153A. The fourth portion 153B is located in the first accommodation space 170. That is to say, the fourth portion 153B can contact the fluid medium in the first accommodation space 170. Along the axial direction of the water outlet valve port 120, the fourth portion 153B can be in abutment with the first sealing portion 160.

[0056] Exemplarily, along the axial direction of the water outlet valve port 120 and towards the direction of the valve core 290, when the pressure of the fluid medium in the water outlet valve port 120 on the second valve seat 150 is greater than the pressure of the fluid medium in the valve cavity 110 on the second valve seat 150 along the axial direction of the water outlet valve port 120 and away from the valve core 290, the second valve seat 150 moves towards the valve core 290 in the axial direction of the water outlet valve port 120, and the second valve seat 150 and the valve core 290 can be closely fitted, improving the sealing performance between the second valve seat 150 and the valve core 290. Along the axial direction of the water outlet valve port 120 and towards the direction of the valve core 290, when the pressure of the fluid medium in the water outlet valve port 120 on the second valve seat 150 is less than the pressure of the fluid medium in the valve cavity 110 on the second valve seat 150 along the axial direction of the water outlet valve port 120 and away from the valve core 290, since the valve cavity 110 is communicated with the first accommodation space 170, the fluid medium in the valve cavity 110 will flow into the first accommodation space 170. The fourth portion 153B is located in the first accommodation space 170, and the fourth portion 153B will also contact the fluid medium. The pressures of the fluid medium in the valve cavity 110 and the first accommodation space 170 can be the same. Along the axial direction of the water outlet valve port 120, the projected area of the fourth portion 153B is greater than the projected area of the second portion 152B. That is to say, along the axial direction of the water outlet valve port 120 and towards the direction of the valve core 290, the pressure of the fluid medium on the fourth portion 153B is greater than the pressure of the fluid medium on the second portion 152B along the axial direction of the water outlet valve port 120 and away from the valve core 290. This can form a two-way seal for the second valve seat 150. That is to say, even if the pressure of the fluid medium in the second valve port on the second valve seat 150 is less than the force of the fluid medium in the valve cavity 110 on the second portion 152B of the second valve seat 150, due to the projected area of the fourth portion 153B being greater than the projected area of the second portion 152B, the second valve seat 150 can still be in close contact with the valve core 290, ensuring the sealing performance between the valve core 290 and the second valve seat 150, reducing the probability of fluid leakage of the three-way valve 1000, and improving the stability and reliability of the operation of the three-way valve 1000.

[0057] Please refer to Figures 1 to 7 , in this embodiment, the three-way valve 1000 further includes a first limiting member 180. The first limiting member 180 is fixed to one end of the water outlet valve port 120 away from the valve core 290. Along the axial direction of the water outlet valve port 120, the first limiting member 180 abuts against the first sealing portion 160.

[0058] The first limiting member 180 is disposed within the water outlet valve port 120. The first limiting member 180 is located at one end of the water outlet valve port 120 away from the valve core 290. Along the axial direction of the water outlet valve port 120, the first limiting member 180 abuts against the first sealing portion 160. Exemplarily, the first sealing portion 160 may include an O-ring, a valve seat disc spring, and a sealing sleeve. Along the radial direction of the water outlet valve port 120, grooves with openings facing away from each other are respectively provided on two side surfaces of the sealing sleeve. The O-rings are respectively disposed within the two grooves, and thus respectively abut against the inner wall of the water outlet valve port 120 and the protrusion 154, so that the second valve seat 150 and the inner wall of the water outlet valve port 120 can be more fully sealed, improving the sealing effect. Moreover, the O-rings are disposed within the grooves, and the grooves also play a role in positioning and protecting the O-rings, preventing the O-rings from being displaced or damaged during installation and use, further enhancing the reliability of the seal.

[0059] The valve seat disc spring is disposed between the sealing sleeve and the first limiting member 180. Along the axial direction of the water outlet valve port 120, two ends of the valve seat disc spring respectively abut against the first limiting member 180 and the sealing sleeve.

[0060] Exemplarily, when the fluid within the valve cavity 110 enters the first accommodation space 170, the fluid will squeeze the first sealing sleeve, causing the first sealing sleeve to move in a direction away from the valve core 290. The setting of the first limiting member 180 can reduce the axial displacement of the sealing sleeve, ensuring that the sealing sleeve is in the correct position, thereby maintaining a good sealing effect. Along the axial direction of the water outlet valve port 120, the valve seat disc spring is disposed between the first sealing sleeve and the first limiting member 180. The valve seat disc spring has a certain elasticity and can continuously provide axial pressure for the sealing sleeve.

[0061] In some embodiments, the first limiting member 180 includes an adjusting pad and a valve seat screw ring. The valve seat screw ring is disposed at one end of the water outlet valve port 120 away from the valve core 290. The adjusting pad is disposed between the valve seat screw ring and the valve seat disc spring.

[0062] In some embodiments, there may be multiple sealing sleeves. Along the axial direction of the water outlet valve port 120, the multiple sealing sleeves are spaced apart. Corresponding O-rings are provided in the grooves on the multiple sealing sleeves.

[0063] Please refer to Figures 1 to 7, in this embodiment, the three-way valve 1000 further includes a valve cover 190. The valve body 100 has a first groove 200, and the valve cover 190 has a second groove 210. Along the axis direction of the valve core 290, the first groove 200 and the second groove 210 are arranged opposite to each other. The valve core 290 has a first shaft 201 and a second shaft 211. The first shaft 201 is rotatably arranged in the first groove 200, and the second shaft 211 is rotatably arranged in the second groove 210. The three-way valve 1000 further includes a valve stem 300 rotatably connected to the valve cover 190, and the valve stem 300 is connected to the second shaft 211.

[0064] Along the axis direction of the valve core 290, the first groove 200 and the second groove 210 are arranged opposite to each other. The valve core 290 has a first shaft 201 and a second shaft 211. Along the axis direction of the valve core 290, the first shaft 201 and the second shaft 211 are arranged opposite to each other. The first shaft 201 is rotatably arranged in the first groove 200, and the second shaft 211 is rotatably arranged in the second groove 210. The valve core 290 may include a valve core 290 body, a first shaft 201, and a second shaft 211. Along the axis direction of the valve core 290, the first shaft 201 and the second shaft 211 are arranged on opposite sides of the valve core 290 body. The first shaft 201 is received in the first groove 200, and the second shaft 211 is received in the second groove 210. The valve stem 300 is fixedly connected to the second shaft 211, and the valve stem 300 drives the valve core 290 to rotate.

[0065] In the related art, the valve stem 300 is used as the second shaft 211 of the valve core 290. Although the structure is simple, when the valve stem 300 drives the valve core 290 to rotate, the valve stem 300 is subjected to a lateral force transmitted by the valve core 290, causing the side of the valve stem 300 close to the valve core 290 to tilt. The local pressure on the valve stem 300 increases, the friction increases, and the valve stem 300 is easily damaged.

[0066] The valve stem 300 is fixed in the second shaft 211, and the valve stem 300 only drives the valve core 290 to rotate, reducing the lateral force transmitted by the valve core 290 to it when the valve stem 300 drives the valve core 290 to rotate. During the operation of the three-way valve 1000, the valve core 290 will be subjected to a lateral force of the fluid medium. Since the second groove 210 is arranged in the valve cover 190, the first groove 200 is arranged in the valve body 100, the first shaft 201 is rotatably arranged in the first groove 200, and the second shaft 211 is rotatably arranged in the second groove 210, the lateral force of the fluid medium on the valve core 290 will be transmitted to the valve body 100 or the valve cover 190. The valve stem 300 only provides the torque for the valve core 290 to rotate and does not bear the radial medium force, reducing the local pressure on the valve stem 300 and the friction force on the valve stem 300, thereby reducing the situation that the valve stem 300 is easily damaged and fails, and improving the reliability of the switching action of the three-way valve 1000.

[0067] In some embodiments, the three-way valve 1000 further includes a driving part, which is connected to the valve stem 300. The driving part drives the valve stem 300 to rotate, thereby driving the valve core 290 to rotate, so that the valve core 290 switches to different positions, achieving the purpose of connecting or closing the pipeline. Exemplarily, the total rotation stroke of the valve core 290 is 90°, and the valve stem 300 drives the valve core 290 to reciprocate within a range of 90°, realizing the switching connection or truncation of the water outlet valve port 120. It should be understood that the switching between the two positions of the valve core 290 is electrically driven, which can be remotely controlled, or can be operated electrically or manually on-site. There is no need to switch between electric and manual operations. The handle and the motor have dual inputs and do not interfere with each other.

[0068] Please refer to Figures 1 to 7 , in this embodiment, the three-way valve 1000 further includes a first bushing 220 and a second bushing 230. The first bushing 220 is disposed between the inner wall of the first groove 200 and the outer peripheral surface of the first shaft 201, and the second bushing 230 is disposed between the inner wall of the second groove 210 and the outer peripheral surface of the second shaft 211.

[0069] The first bushing 220 separates the inner wall of the first groove 200 from the outer peripheral surface of the first shaft 201, avoiding direct contact between the first shaft 201 and the first groove 200. The second bushing 230 separates the inner wall of the second groove 210 from the outer peripheral surface of the second shaft 211, avoiding direct contact between the second shaft 211 and the second groove 210. During the rotation of the valve core 290, the first bushing 220 and the second bushing 230 can bear the main friction and wear, reduce the wear of the first shaft 201 and the first groove 200 as well as the second shaft 211 and the second groove 210, and extend the service life of the key components of the three-way valve 1000.

[0070] Please refer to Figures 1 to 7 , in this embodiment, the valve cover 190 has a first hole 240, and the valve stem 300 is rotatably disposed in the first hole 240. The first hole 240 includes a first section 241 and a second section 242. The inner diameter of the first section 241 is smaller than that of the second section 242. The first section 241 is closer to the valve core 290 than the second section 242. Two first grooves 243 are provided on the inner peripheral surface of the first section 241. Along the axial direction of the first section 241, the two first grooves 243 are spaced apart; a sealing ring 250 and a first retaining ring 251 are provided in the first groove 243. The sealing ring 250 abuts against the outer peripheral surface of the valve stem 300 and the inner peripheral surface of the first section 241. Along the axial direction of the first section 241, the sealing ring 250 abuts against the first retaining ring 251.

[0071] The valve cover 190 has a first hole 240 through which the valve stem 300 passes. The valve stem 300 can rotate within the first hole 240. The first hole 240 includes a first section 241 and a second section 242. Two first grooves 243 are provided on the inner peripheral surface of the first section 241. A sealing ring 250 and a first retaining ring 251 are arranged within the first grooves 243. Along the radial direction of the first hole 240, the inner diameter of the sealing ring 250 abuts against the valve stem 300, and the outer diameter of the sealing ring 250 abuts against the first groove 200. That is to say, the outer diameter of the sealing ring 250 abuts against the inner peripheral surface of the first section 241, so as to seal between the valve stem 300 and the valve cover 190. A sealing ring 250 and a first retaining ring 251 are arranged within each first groove 243. Such a double-sealing structure greatly improves the sealing effect between the valve stem 300 and the valve cover 190. Even if one sealing ring 250 is slightly damaged or its sealing performance deteriorates, the other sealing ring 250 can still play a sealing role, effectively preventing fluid from leaking through the gap between the valve stem 300 and the valve cover 190.

[0072] Along the axial direction of the first hole 240, the first retaining ring 251 abuts against the sealing ring 250 and the first groove 200 respectively. The first retaining ring 251 can play a role in protection and auxiliary sealing. The first retaining ring 251 can prevent the sealing ring 250 from being extruded out of the first groove 243 under the action of fluid, ensuring that the sealing ring 250 is always in an effective sealing position, enhancing the stability of the entire sealing structure and improving the sealing performance.

[0073] Please refer to Figures 1 to 7 , in this embodiment, the three-way valve 1000 further includes a first pressing component 260 and a first packing part 270. The first pressing component 260 is sleeved on the valve stem 300 and fixedly connected to the valve cover 190. The first packing part 270 is arranged between the inner peripheral surface of the second section 242 and the outer peripheral surface of the valve stem 300. Along the axial direction of the valve stem 300, the two ends of the first packing part 270 respectively abut against the first pressing component 260 and one end of the first section 241.

[0074] The first pressing component 260 is sleeved on the outer peripheral surface of the valve stem 300 and fixedly connected to the valve cover 190. The first packing part 270 is arranged between the inner peripheral surface of the second section 242 and the outer peripheral surface of the valve stem 300. Along the radial direction of the first hole 240, the first packing part 270 abuts against the valve stem 300 and the inner peripheral surface of the second section 242 respectively. Along the axial direction of the valve stem 300, the two ends of the first packing part 270 respectively abut against the pressing component and one end of the first section 241. Since the inner diameter of the first section 241 is smaller than the inner diameter of the second section 242, it can be understood that along the radial direction of the first hole 240, the first packing part 270 fills the space between the first section 241 and the second section 242.

[0075] The seal between the valve stem 300 and the valve cover 190 is mainly achieved through the sealing ring 250. When the sealing ring 250 fails, the first packing component 260 can be used to compress the first packing part 270, thereby achieving the sealing effect. Exemplarily, the material of the first packing part 270 can be configured as high-purity flexible graphite packing. High-purity flexible graphite packing has excellent properties such as good resilience, self-lubrication, corrosion resistance, small friction coefficient, and long service life, which can better ensure the sealing function of the first packing part 270.

[0076] Please refer to Figures 1 to 7 , in this embodiment, the first packing component 260 includes a first pressing plate 261 and a packing gland 262. The valve stem 300 passes through the first pressing plate 261 and the packing gland 262. The first pressing plate 261 is fixedly connected to the valve cover 190 through fasteners. Along the axial direction of the second section 242, the packing gland 262 is located between the first pressing plate 261 and the first packing part 270 and abuts against the first pressing plate 261 and the first packing part 270 respectively.

[0077] The first packing component 260 includes a first pressing plate 261 and a packing gland 262. The first pressing plate 261 is connected to the valve cover 190 through fasteners. The fasteners can be configured as bolt structural parts. Along the axial direction of the first hole 240, the packing gland 262 is arranged between the first pressing plate 261 and the first packing part 270, and the packing gland 262 abuts against the first packing part 270 and the first pressing plate 261 respectively. Exemplarily, a packing disc spring can also be arranged between the packing gland 262 and the first pressing plate 261. In this way, a packing disc spring is arranged between the gland and the first pressing plate 261. The elastic characteristics of the packing disc spring can play a compensating role. When the first packing part 270 undergoes minor deformation or loosening due to factors such as temperature change and vibration during the operation of the three-way valve 1000, the packing disc spring can release or absorb elastic potential energy in a timely manner, automatically adjust the pressure applied to the first packing part 270, maintain the stability and reliability of the seal, and reduce the leakage risk caused by working condition changes.

[0078] The first pressing plate 261 is fixedly connected to the valve cover 190 through fasteners (such as bolt structural parts). By adjusting the tightening degree of the bolts, the axial pressure applied by the first pressing plate 261 to the packing gland 262 can be flexibly controlled. Furthermore, the packing gland 262 transfers this pressure to the first packing part 270, enabling the first packing part 270 to obtain an appropriate compression amount, and achieving precise adjustment of the sealing performance between the valve stem 300 and the valve cover 190. Whether during the initial installation and commissioning of the three-way valve 1000 or when the sealing performance deteriorates after long-term use, it can be conveniently adjusted to ensure a good sealing effect.

[0079] In some embodiments, the material of the valve cover 190 can be configured as a titanium alloy ZTi60 casting.

[0080] In some embodiments, a first limiting groove 191 is provided inside the valve cover 190. The opening of the first limiting groove 191 faces the valve stem 300. A first limiting protrusion 301 is fixed on the valve stem 300. The first limiting protrusion 301 makes a rotary motion in the first limiting groove 191. During the actual switching operation of the three-way valve 1000, the first limiting protrusion 301 does not contact the peripheral wall of the first limiting groove 191.

[0081] In some embodiments, the first flow channel 291 is configured as an L-shaped flow channel. The turning radius of the fluid passing through the first flow channel 291 is 90°. The first flow channel 291 is transitioned by a larger arc radius bend, reducing the flow resistance of the right-angle flow channel and enabling the valve core 290 to have a larger flow capacity in a smaller space.

[0082] In some embodiments, the three-way valve 1000 further includes a sewage discharge port 280. The sewage discharge port 280 is provided on the valve body 100 and communicates with the valve cavity 110. When there is a lot of dirt in the valve cavity 110, the dirt in the valve cavity 110 can be discharged through the sewage discharge port 280.

[0083] Please refer to Figure 8 , an embodiment of the present application provides a drainage system 2000, including the three-way valve 1000 according to any one of the embodiments of the present application.

[0084] For the ship 3000 provided by the embodiment of the present application, a diversion gap 141 is provided between the first valve seat 140 and the water inlet valve port 130, so that the pressure difference between the two ends of the second valve seat 150 of the other two water outlet valve ports 120 is relatively small. Furthermore, when the valve core 290 turns, the torsional force required by the valve core 290 can be reduced, energy consumption can be reduced, and the friction between the valve core 290 and the valve seat can also be reduced, reducing the probability of damage to the valve core 290. A first sealing portion 160 is provided between the second valve seat 150 and the corresponding water outlet valve port 120, which can ensure tight sealing when any one of the water outlet valve ports 120 is in the closed state, preventing backflow or leakage.

[0085] An embodiment of the present application provides a ship 3000, including the drainage system 2000 according to any one of the embodiments of the present application.

[0086] For the ship 3000 proposed in the embodiments of the present application, a diversion gap 141 is provided between the first valve seat 140 and the water inlet valve port 130, so that the pressure difference at both ends of the second valve seat 150 of the other two water outlet valve ports 120 is relatively small. Thus, when the valve core 290 turns, the torsional force required for the valve core 290 can be reduced, the energy consumption can be reduced, and the friction between the valve core 290 and the valve seat can also be reduced, reducing the probability of damage to the valve core 290. A first sealing portion 160 is provided between the second valve seat 150 and the corresponding water outlet valve port 120, which can ensure tight sealing when any one of the water outlet valve ports 120 is in the closed state, preventing backflow or leakage.

[0087] It should also be noted that the term "including", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or elements inherent to such process, method, commodity or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, commodity or device including the said element.

[0088] Each embodiment in this specification is described in a progressive manner. The same or similar parts among the embodiments can be referred to each other, and the differences between each embodiment and other embodiments are emphasized. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method embodiment.

[0089] The above are only the embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

[0090] Although the embodiments of the present application are described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A three-way valve, characterized in that, Comprising: A valve body, within which a valve cavity is provided. Along the circumferential direction of the valve body, the valve body is provided with two water outlet valve ports communicating with the valve cavity and one water inlet valve port communicating with the valve cavity. A valve core, having a first flow passage. The valve core is rotatably arranged within the valve cavity so that the first flow passage connects the water inlet valve port and any one of the water outlet valve ports. Three valve seats, each valve seat being correspondingly arranged at the water outlet valve port and the water inlet valve port, and each valve seat being in sealing cooperation with the valve core. Among them, the three valve seats include one first valve seat and two second valve seats. The first valve seat is arranged at the water inlet valve port, and each second valve seat is arranged at the corresponding water outlet valve port. A diversion gap is provided between the first valve seat and the water inlet valve port, and a first sealing portion is provided between the second valve seat and the corresponding water outlet valve port.

2. The three-way valve according to claim 1, characterized in that, The second valve seat includes a body portion and a protruding portion. Along the axial direction of the water outlet valve port, the body portion has a first end face and a second end face arranged oppositely. The first end face faces the valve core and is in sealing contact with the valve core. The protruding portion is arranged on the second end face, and the first sealing portion is provided between the protruding portion and the inner wall of the water outlet valve port. The three-way valve further includes a first accommodating space, which is located between the body portion and the inner wall of the water outlet valve port and between the body portion and the first sealing portion. The first accommodating space communicates with the valve cavity, and a part of the second end face is located in the first accommodating space.

3. The three-way valve according to claim 2, characterized in that, The first end face includes a first part and a second part. The first part is in sealing cooperation with the valve core, and the second part is located in the valve cavity. The second end face includes a third part and a fourth part. The third part is provided with the protruding portion, and the fourth part is located in the first accommodating space. Along the axial direction of the water outlet valve port, the projected area of the fourth part is larger than the projected area of the second part.

4. The three-way valve according to claim 3, characterized in that, The three-way valve further includes a first limiting member, which is fixed at one end of the water outlet valve port away from the valve core. Along the axial direction of the water outlet valve port, the first limiting member abuts against the first sealing portion.

5. The three-way valve according to claim 1, characterized in that, The three-way valve further includes a valve cover. The valve body has a first groove, and the valve cover has a second groove. Along the rotation axis direction of the valve core, the first groove and the second groove are arranged oppositely. The valve core has a first shaft and a second shaft. The first shaft is rotatably arranged in the first groove, and the second shaft is rotatably arranged in the second groove. The three-way valve further includes a valve rod rotatably connected to the valve cover, and the valve rod is connected to the second shaft.

6. The three-way valve according to claim 5, characterized in that, The three-way valve further includes a first shaft sleeve and a second shaft sleeve. The first shaft sleeve is arranged between the inner wall of the first groove and the outer peripheral surface of the first shaft, and the second shaft sleeve is arranged between the inner wall of the second groove and the outer peripheral surface of the second shaft.

7. The three-way valve according to claim 5, characterized in that The valve cover has a first hole, the valve stem is rotatably arranged in the first hole, the first hole includes a first section and a second section, the inner diameter of the first section is smaller than that of the second section, the first section is closer to the valve core than the second section, and two first grooves are arranged on the inner peripheral surface of the first section; the two first grooves are spaced along the axial direction of the first section. A sealing ring and a first retaining ring are arranged in the first groove, the sealing ring abuts against the outer peripheral surface of the valve stem and the inner peripheral surface of the first section, and along the axial direction of the first section, the sealing ring abuts against the first retaining ring.

8. The three-way valve according to claim 7, characterized in that, The three-way valve further includes a first pressing component and a first packing part. The first pressing component is sleeved on the valve stem and fixedly connected to the valve cover. The first packing part is arranged between the inner peripheral surface of the second section and the outer peripheral surface of the valve stem. Along the axial direction of the valve stem, the two ends of the first packing part respectively abut against the first pressing component and one end of the first section.

9. The three-way valve according to claim 8, characterized in that, The first pressing component includes a first pressing plate and a packing gland. The valve stem passes through the first pressing plate and the packing gland. The first pressing plate and the valve cover are fixedly connected by fasteners. Along the axial direction of the second section, the packing gland is located between the first pressing plate and the first packing part and abuts against the first pressing plate and the first packing part respectively.

10. A drainage system, characterized in that, It includes the three-way valve according to any one of claims 1-9.

11. A ship, characterized in that, It includes the drainage system according to claim 10.

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