Double-seat double-eccentric three-way rotary valve

Abstract

The invention provides a double-seat double-eccentric three-way rotary valve which comprises a valve body, a valve rod, a valve rod, a valve rod and a valve rod. The two valve seats are respectively arranged on the inner sides of the first interface and the second interface; the valve rod penetrates through one side of the valve body, and the first end of the valve rod is arranged in the cavity of the valve body; the valve element is arranged in the cavity of the valve body, connected with the first end of the valve rod and provided with a first end face and a second end face. When the valve element rotates along with the valve rod, the first end face can be matched with the valve seat at the first connector, and the second end face can be matched with the valve seat at the second connector. The valve rod forms a first eccentricity relative to the valve seat at the first connector in the direction of the center line of the first connector, and the valve rod forms a second eccentricity relative to the center line of the first connector. A double-eccentric sealing structure is adopted, and good adjusting and circulating performance is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valves, in particular to a double-seat double-eccentric three-way rotary valve. BACKGROUND

[0002] The structure of the industrial process control three-way valve on the market is mainly three-way ball valve and three-way stop valve. The three-way ball valve can better realize flow diversion, but it is not good at flow regulation and has requirements for medium cleanliness. The three-way stop valve can better realize flow regulation, but sacrifices the kinetic energy of the fluid, has high energy consumption and low operation efficiency. At the same time, the price of the three-way valve material is unstable. The price of main raw materials such as stainless steel and aluminum alloy is greatly affected by the market of bulk commodities, directly impacting the cost control of the three-way valve, resulting in high cost of the existing three-way ball valve and three-way stop valve.

[0003] Therefore, the present application provides a double-seat double-eccentric rotary valve which can simultaneously provide good flow regulation and flow diversion function by using a special double-eccentric sealing structure. SUMMARY

[0004] In view of the defects in the prior art, the present application aims to provide a three-way rotary valve which can simultaneously provide good flow regulation and flow diversion function.

[0005] The double-seat double-eccentric three-way rotary valve provided by the present application comprises: a valve body, which is internally hollow and has a first interface, a second interface and a third interface; two valve seats, which are respectively arranged on the inner side of the first interface and the second interface; a valve rod, which passes through one side of the valve body, has a first end arranged in the cavity of the valve body and can rotate around an axis; a valve core, which is arranged in the cavity of the valve body, is connected with the first end of the valve rod and has a first end face and a second end face; when the valve core rotates with the valve rod, the first end face can cooperate with the valve seat at the first interface, and the second end face can cooperate with the valve seat at the second interface; In a plane perpendicular to the valve rod, the valve rod forms a first eccentricity relative to the valve seat at the first interface along the center line direction of the first interface, and forms a second eccentricity relative to the center line of the first interface.

[0006] Preferably, the valve rod and the valve core are connected by a flat key.

[0007] Preferably, four open rings are arranged in the first interface and the second interface respectively, and the four open rings press the valve seat to the valve body by bolts.

[0008] Preferably, the valve core is of a T-shaped structure, the first end face and the second end face are respectively arranged at two straight ends of the T-shaped structure, and the angular end of the T-shaped structure is connected with the valve rod.

[0009] Further, the first end face and the second end face of the valve core are respectively provided with a sealing ring, and the sealing ring and the valve seat form a sealing pair.

[0010] Further, the sealing ring is of an arc surface, and the valve seat is of an inclined surface.

[0011] Preferably, the sealing ring and the valve core are connected through a bolt.

[0012] Preferably, a winding gasket is further arranged between the sealing ring and the valve core.

[0013] Preferably, the valve rod is arranged on the bisector of the included angle between the first interface center line and the second interface center line.

[0014] Preferably, the relationship among the first eccentricity value, the second eccentricity value and the included angle of the sealing surface satisfies that the sealing ring is not blocked by the valve seat.

[0015] Compared with the prior art, the present application has the following beneficial effects: The double-seat double-eccentric three-way rotary valve provided by the present application adopts a double-eccentric sealing structure, ensures that there is no interference during the valve action process, has good adjusting and flow performance, the included angle among the three ports of the valve can be adjusted at will, has good adaptability to various working conditions, the valve structure is compact, light in weight, and the valve is quickly opened and closed, the parts are easy to disassemble, maintain and replace, and the overall cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments with reference to the following drawings: Figure 1 FIG. 1 is a structural schematic view of a double-seat double-eccentric three-way rotary valve according to an embodiment of the present application; Figure 2 FIG. 2 is a sealing pair schematic view of a valve core and a valve seat according to an embodiment of the present application; Figure 3 FIG. 3 is a motion process schematic view of a three-way rotary valve according to an embodiment of the present application; Figure 4 FIG. 4 is an overall appearance structural schematic view of a three-way rotary valve according to an embodiment of the present application; Figure 5 FIG. 5 is a three-way rotary valve schematic view according to another embodiment of the present application.

[0017] In the drawings, 1-flat key, 2-valve stem, 3-valve body, 4-first bolt, 5-valve core, 6-first winding gasket, 7-sealing ring, 8-flat washer, 9-pressing ring, 10-four open ring, 11-valve seat, 12-second winding gasket, 13-second bolt. DETAILED DESCRIPTION

[0018] The application will be described in detail below with specific examples. The following examples will help those skilled in the art to further understand the application, but do not limit the application in any form. It should be pointed out that for those skilled in the art, without departing from the concept of the application, a number of changes and improvements can be made. These are within the scope of the application.

[0019] The application provides a double-seat double-eccentric three-way rotary valve, which adopts a double-eccentric sealing structure, ensures no interference during the valve operation process, has good adjusting and flow performance, is compact in structure, light in weight, and fast in switching, and has good adaptability to various working conditions.

[0020] As shown in Figure 1 The double-seat double-eccentric three-way rotary valve of the embodiment includes a valve body 3, the inside of the valve body 3 is a cavity, and the valve body 3 has three ports, i.e., a first interface, a second interface, and a third interface. A valve seat 11 is arranged on the inner side of the first interface and the second interface, i.e., the side close to the cavity. Specifically, a four open ring 10 is arranged on the outer side of the valve seat 11, a pressing ring 9 is arranged on the outer side of the four open ring 10, and a first bolt 4 penetrates through the pressing ring 9, the four open ring 10, and the valve seat 11 and is in meshing connection with the valve body 3, so as to fix the valve seat 11 on the valve body 3. Through the first bolt 4, the valve seat 11 can be replaced alone without disassembling the whole valve when the valve seat 11 is worn, so that the maintenance is convenient.

[0021] To improve the sealing of the valve seat 11 and the valve body 3, a second winding gasket 12 is arranged between the valve seat 11 and the valve body 3. When the valve seat 11 is pressed on the valve body 3 by the first bolt 4, the second winding gasket 12 is pressed, so as to realize sealing.

[0022] The valve stem 2 penetrates through one side of the valve body 3, so that the first end of the valve stem 2 is located in the cavity of the valve body 3, and the second end of the valve stem 2 is located on the outer side of the valve body 3. The second end of the valve stem 2 can be connected with a driving mechanism, so that the valve stem 2 can rotate around the axis under the action of the driving mechanism.

[0023] A valve core 5 is connected to the first end of the valve stem 2. The valve core 5 is located inside the cavity of the valve body 3 and can rotate with the valve stem 2. The valve core 5 has a first end face and a second end face. When the valve core 5 rotates, the first end face can cooperate with the valve seat 11 at the first interface to close the first interface, allowing fluid to flow through the second and third interfaces; the second end face can cooperate with the valve seat 11 at the second fluid outlet to close the second fluid outlet, allowing fluid to flow through the first and third interfaces; alternatively, the valve core 5 can be placed in an intermediate state, with neither the first nor the second interface closed, allowing fluid to flow simultaneously from the first, second, and third interfaces. Furthermore, by changing the rotation angle of the valve core 5, the flow rate at the first and second interfaces can be adjusted. Thus, the flow direction and flow rate regulation of the three-way rotary valve are realized.

[0024] The three-way rotary valve in this embodiment does not limit the direction of fluid flow. Fluid can flow in from any one or any two of the first, second, and third ports, and flow out from the remaining ports.

[0025] In this embodiment, the valve core 5 has a T-shaped structure. The straight ends of the T-shaped structure are the first end face and the second end face, respectively. The angular end of the T-shaped structure is connected to the valve stem 2, allowing the first end face and the second end face to rotate around the valve stem 2. In this embodiment, the valve core 5 and the valve stem 2 are connected by a flat key 1.

[0026] Sealing rings 7 are respectively provided on the first and second end faces of the valve core 5, and the sealing rings 7 cooperate with the valve seat 11. The sealing rings 7 are connected to the valve core 5 by a second bolt 13, which allows the sealing rings 7 to be replaced and maintained. A flat washer 8 is provided between the nut of the second bolt 13 and the sealing ring 7 to protect the surface of the sealing ring 7.

[0027] To improve the sealing between the sealing ring 7 and the valve core 5, a first spiral wound gasket 6 is provided between the sealing ring 7 and the valve core 5. When the second bolt 13 presses the sealing ring 7 onto the valve core 5, the first spiral wound gasket 6 is compressed, thereby achieving a seal.

[0028] The sealing pair formed by the sealing ring 7 and the valve seat 11 is as follows: Figure 2 As shown, the sealing surface of the sealing ring 7 is an arc-shaped surface, and the sealing surface of the valve seat 11 is an inclined surface. This ensures that when the sealing ring 7 and the valve seat 11 come into contact, only one line is the actual contact surface. This allows a small torque to be used to form a large sealing pressure between the contact surfaces, thereby achieving a good sealing effect.

[0029] like Figure 1As shown, the axis of the valve stem 2 is perpendicular to the plane formed by the first interface, the second interface and the third interface. The axis of the valve stem 2 to the sealing surface of the valve seat 11 at the first interface forms a first eccentricity, and the axis of the valve stem 2 to the center line of the first interface forms a second eccentricity. Through the first eccentricity and the second eccentricity, the valve is frictionless throughout the rotation process, the valve opening and closing is rapid, and the service life is prolonged.

[0030] By adjusting the first eccentricity value and the angle of the sealing surface of the valve core and the valve seat, the second eccentricity value is reduced, so that the unbalanced force borne by the valve is greatly reduced, and the torque requirement for the actuator is reduced. Specifically, the first eccentricity value is increased, so that the distance between the two sealing rings 7 is increased, so that the second eccentricity is reduced, and the valve stem 2 does not interfere with the two sealing rings 7; at the same time, by setting a reasonable sealing surface angle, when the second eccentricity is reduced, the sealing ring 7 and the valve seat 11 do not interfere with each other and maintain good sealing performance throughout the valve operation.

[0031] The valve stem 2 can be arranged on the bisector of the included angle formed by the center line of the first interface and the center line of the second interface, so that the distance from the center line of the valve stem 2 to the two center lines is equal, and the valve core 5 can form a symmetrical structure.

[0032] It should be understood that the axis of the valve stem 2 is also eccentric relative to the center line of the second interface and the valve seat 11.

[0033] The operation process of the three-way rotary valve of the embodiment is as shown in Figure 3 The actuator rotates the valve core 5 through the valve stem 2 to adjust the angle of the valve opening, so as to realize the switching of the flow passage and the distribution of the medium. As shown in Figure 3 The sealing surface of the valve core 5 is in contact with the right valve seat 11 for sealing, and the upper interface of the valve body 3 is in communication with the left interface; as shown in the middle figure, the valve core 5 is not in contact with the two valve seats 11, so as to realize the distribution adjustment of the medium; as shown in the right figure, the sealing surface of the valve core 5 is in contact with the left valve seat 11 for sealing, and the upper interface of the valve body 3 is in communication with the right interface.

[0034] The overall appearance of the three-way rotary valve of the embodiment is as shown in Figure 4 The second end of the valve stem 2 is connected to the driving mechanism, and the three ports of the valve body 3 are connected to the external pipeline in a flange manner.

[0035] As shown in Figure 5 The three ports of the valve body 3 can adopt different included angles, and the valve core 5 of the embodiment can be applicable to three-way valves with different included angles. It should be noted that the included angle of the valve core 5 can also be changed to be Y-shaped structure, "one" structure, etc., so as to better adapt to the structure of the valve body 3.

[0036] The specific embodiments of the present application are described above. It needs to be understood that the present application is not limited to the specific embodiments described above, and various changes or modifications can be made by those skilled in the art within the scope of the claims, which does not affect the essential content of the present application. The embodiments of the present application and the features in the embodiments can be combined with each other at will without conflict.

Claims

1. A double-seat, double-eccentric, three-way rotary valve, characterized in that, include: The valve body has an internal cavity and has a first interface, a second interface, and a third interface. Two valve seats are respectively located inside the first interface and the second interface; A valve stem, which passes through one side of the valve body, with its first end placed inside the cavity of the valve body, is capable of rotating about an axial direction; The valve core is disposed in the cavity of the valve body and is connected to the first end of the valve stem. It has a first end face and a second end face. When the valve core rotates with the valve stem, the first end face can cooperate with the valve seat at the first interface, and the second end face can cooperate with the valve seat at the second interface. In a plane perpendicular to the valve stem, the valve stem forms a first eccentricity relative to the valve seat at the first interface along the centerline of the first interface, and the valve stem forms a second eccentricity relative to the centerline of the first interface.

2. The double-seat, double-eccentric, three-way rotary valve as described in claim 1, characterized in that, The valve stem and the valve core are fitted together by a key.

3. The double-seat, double-eccentric, three-way rotary valve as described in claim 1, characterized in that, The first interface and the second interface are each provided with four open rings, and the four open rings are used to press the valve seat to the valve body by bolts.

4. The double-seat, double-eccentric, three-way rotary valve as described in claim 1, characterized in that, The valve core has a T-shaped structure, with the first end face and the second end face respectively located at the two straight ends of the T-shaped structure, and the angular end of the T-shaped structure connected to the valve stem.

5. The double-seat, double-eccentric, three-way rotary valve as described in claim 4, characterized in that, The valve core has a sealing ring on its first end face and a sealing ring on its second end face, and the sealing ring cooperates with the valve seat to form a sealing pair.

6. The double-seat, double-eccentric, three-way rotary valve as described in claim 5, characterized in that, At the mating point between the sealing ring and the valve seat, the sealing ring has an arc-shaped surface, and the valve seat has an inclined surface.

7. The double-seat, double-eccentric, three-way rotary valve as described in claim 5, characterized in that, The sealing ring is connected to the valve core by bolts.

8. The double-seat, double-eccentric, three-way rotary valve as described in claim 5, characterized in that, A spiral wound gasket is also provided between the sealing ring and the valve core.

9. The double-seat, double-eccentric, three-way rotary valve as described in claim 1, characterized in that, The valve stem is located on the bisector of the angle between the center line of the first interface and the center line of the second interface.

10. The double-seat, double-eccentric, three-way rotary valve as described in claim 1, characterized in that, The relationship between the first eccentricity value, the second eccentricity value, and the included angle of the sealing surface satisfies the condition that the sealing ring is not blocked by the valve seat.

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