Rotatable lifting valve connecting piece

Abstract

The utility model relates to the field of lifting valves, in particular to a rotatable lifting valve connecting piece which comprises a valve body, a valve cover installed on the valve body, a valve rod penetrating through the valve cover and extending into the valve body and a valve clack connected with the bottom of the valve rod. A valve seat located below the valve clack is arranged in the valve body, a valve rod cavity communicated with the flow channel is formed in the valve body, the valve rod is in threaded connection with a push piece located in the valve rod cavity, a flow guide plate is arranged on the valve rod in a sliding mode, the flow guide plate is located in the valve rod cavity and located above the valve clack, and the flow guide plate comprises a sliding part and a flow guide part integrally fixed to the lower portion of the sliding part. The lower end face of the flow guide part is an arc-shaped spherical surface, the flow guide part is attached to the connecting face of the valve rod cavity and the flow channels, the flow channels on the two sides are in arc transition through the flow guide part, the upper end of the sliding part is in threaded connection with a gland, the gland is slidably arranged on the valve rod and connected with the sliding part in a matched mode, an inner groove is formed in the inner side of the gland, and the push piece is located in the inner groove.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of lift valve relates to a rotatable lift valve connecting piece. BACKGROUND

[0002] The rotatable lift valve is also commonly known as a stop valve, which is a control component widely used in fluid conveying systems. Its working principle is mainly to realize the opening and closing of the valve by rotating the valve stem to drive the lifting of the valve disc, so as to control the on-off and flow size of the fluid. In the existing structure of the rotatable lift valve, the valve body flow channel is located at the lower end of the valve cover, which is also the valve rod cavity where the valve rod is located. The upper surface of the valve rod cavity is the lower end surface of the valve cover, and the lower end surface of the valve cover is generally flat. When the valve disc is opened, the fluid will flow through the valve rod cavity when it passes through the flow channels on both sides. However, since the upper surface of the valve rod cavity is flat, it will cause a large obstruction to the flow of the fluid, resulting in a large turbulent flow and resistance when the fluid flows through this place, thereby causing a loss of flow and reducing the working efficiency of the valve. At the same time, it may also increase the energy consumption in the fluid conveying process. SUMMARY

[0003] The utility model provides a rotatable lift valve connecting piece to solve the prior art problems.

[0004] The utility model discloses a rotatable lift valve connecting piece, which comprises a valve body, a valve cover installed on the valve body, a valve stem penetrating through the valve cover and extending into the valve body, and a valve disc connected to the bottom of the valve stem and located inside the valve body. The outer end of the valve stem is provided with a hand wheel. The two ends of the valve body are provided with flow channels. The inside of the valve body is provided with a valve seat located below the valve disc. The valve rod cavity is located directly above the valve seat. A push piece is threadedly connected to the valve rod cavity. A flow guide plate is slidably arranged on the valve stem. The flow guide plate is located inside the valve rod cavity and above the valve disc. The flow guide plate comprises a sliding part and a flow guide part integrally fixed below the sliding part. The lower end surface of the flow guide part is arc-shaped and spherical. The flow guide part is attached to the connecting surface of the valve rod cavity and the flow channel. The flow guide part transitions the flow channels on both sides through a circular arc. A gland is threadedly connected to the upper end of the sliding part. The gland is slidably arranged on the valve stem. The gland is connected with the sliding part. An inner groove is formed in the inner side of the gland. The push piece is located in the inner groove.

[0005] Further improvement, the middle part of the sliding part is fixed with a circular plate, the outer side of the circular plate is provided with a C-shaped sealing ring, the C-shaped sealing ring is attached to the inner wall of the valve rod cavity, and the C-shaped sealing ring is located above the flow guide plate.

[0006] Further improvement, the slits on both sides of the valve seat are inclined outward along the upward direction, and the slits on both sides of the valve disc bottom are matched with the shape of the slits.

[0007] Further improvement, the valve stem top threaded connection with valve stem nut, the valve stem nut is located in the upper end of the hand wheel.

[0008] Compared with the prior art, the utility model discloses a rotatable type lifting valve connecting piece has the beneficial effects of:

[0009] The flow guide plate is arranged on the valve stem, the lower end face of the flow guide part of the flow guide plate is an arc spherical surface, and is attached to the connecting surface of the valve stem cavity and the flow passage; the sliding part is matched with the gland to form an inner groove for accommodating the push piece. The flow guide plate effectively reduces the resistance and turbulence of fluid flowing through the valve stem cavity, reduces the flow loss, and improves the fluid flow efficiency; and ensures the stable movement of the flow guide plate, and ensures the reliable flow guide function during the opening and closing of the valve. BRIEF DESCRIPTION OF DRAWINGS

[0010] Fig. 1 It is a structure schematic view of the utility model

[0011] Fig. 2 It is a structure schematic view of the utility model internal valve clack closing

[0012] Fig. 3 It is a structure schematic view of the utility model internal valve clack opening

[0013] Fig. 4 It is a structure schematic view of the utility model local enlarged view

[0014] In the drawing, 1-valve body, 11-flow passage, 12-valve seat, 13-valve stem cavity, 2-valve cover, 3-valve stem, 31-push piece, 4-hand wheel, 6-valve clack, 7-flow guide plate, 71-sliding part, 72-flow guide part, 73-gland, 74-inner groove, 75-round plate, 76-C type sealing ring, 8-valve stem nut. DETAILED DESCRIPTION

[0015] In the description of the utility model, it is to be explained that the orientation or position relation indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is the orientation or position relation shown in the drawing, and is only for the convenience of describing the utility model and simplifying the description, and is not to indicate or imply that the indicated device or element must have a particular orientation, a particular orientation and operation, and therefore cannot be understood as a limitation on the utility model; unless otherwise explicitly specified and limited, the terms "mounting", "connection" and "connection" should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, etc. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0016] The following will be combined with the embodiment and the drawing Figs. 1-4The technical solution of this utility model will be further described below.

[0017] Example 1

[0018] A rotatable lifting valve connector includes a valve body 1, a valve cover 2 mounted on the valve body 1, a valve stem 3 penetrating the valve cover 2 and extending into the valve body 1, and a valve disc 6 connected to the bottom of the valve stem 3 and located inside the valve body 1. A handwheel 4 is provided at the outer end of the valve stem 3. Flow channels 11 are provided at both ends of the valve body 1. A valve seat 12 located below the valve disc 6 is provided inside the valve body 1. A valve stem cavity 13 communicating with the flow channels 11 is provided inside the valve body 1. The valve stem cavity 13 is located directly above the valve seat 12. A push plate 31 located inside the valve stem cavity 13 is threadedly connected to the valve stem 3. A sliding plate is provided on the valve stem 3. A flow guide plate 7 is located inside the valve stem cavity 13 and above the valve disc 6. The flow guide plate 7 includes a sliding part 71 and a flow guide part 72 integrally fixed below the sliding part 17. The lower end face of the flow guide part 72 is an arc-shaped spherical surface. The flow guide part 72 fits the connection surface between the valve stem cavity 13 and the flow channel 11, and the flow channels on both sides are transitioned by the arc of the flow guide part 72. A pressure cap 73 is threadedly connected to the upper end of the sliding part 71. The pressure cap 73 is slidably disposed on the valve stem 3. The pressure cap 73 is connected to the sliding part 71, and an inner groove 74 is formed inside the pressure cap 73. The pusher plate 31 is located in the inner groove 74.

[0019] like Figs. 1-4 As shown, rotating the handwheel drives the valve stem to rotate. Since the valve stem is threadedly connected to the push plate, the rotation of the valve stem causes the push plate to move up and down on the valve stem. The push plate is located in the inner groove formed by the gland and the sliding part. The movement of the push plate pushes the guide plate to slide on the valve stem. When the valve needs to be opened, rotating the handwheel raises the valve stem, causing the push plate to move the guide plate and valve disc upwards. The valve disc leaves the valve seat, opening the flow channels on both sides. When the valve is closed, rotating the handwheel in the opposite direction lowers the valve stem, causing the valve disc to adhere to the valve seat and block the flow channel. The lower end face of the guide plate's guide section is an arc-shaped spherical surface that fits the connection surface between the valve stem cavity and the flow channel. When the valve is open and fluid flows, the arc-shaped spherical guide section guides the fluid, allowing it to flow more smoothly from one flow channel through the valve stem cavity into the other flow channel.

[0020] This design effectively improves upon the problems of poor fluid flow and significant flow loss caused by the flat upper surface of the valve stem cavity in existing valves. The rounded transition of the guide plate greatly reduces turbulence and resistance as the fluid flows through the valve stem cavity, allowing for smoother fluid flow and thus improving flow efficiency and reducing flow loss. Simultaneously, the sliding connection between the guide plate and the valve stem, as well as the fit between the gland and the sliding part, ensures the stability of the guide plate's movement on the valve stem, enabling the guide plate to reliably perform its guiding function during valve opening and closing.

[0021] As a further preferred embodiment, the middle part of the sliding part 71 is fixed with a round plate 75, and a C-shaped sealing ring 76 is arranged outside the round plate 75, which is attached to the inner wall of the valve rod cavity 13 and is located above the flow guide plate 7. When the flow guide plate slides on the valve rod, the C-shaped sealing ring is always in contact with the inner wall of the valve rod cavity, forming a sealing barrier. During the operation of the valve, whether the valve is open or closed, the C-shaped sealing ring can prevent fluid from leaking from the gap between the flow guide plate and the inner wall of the valve rod cavity.

[0022] As a further preferred embodiment, the slits on both sides of the valve seat 12 are arranged obliquely in the upward and outward direction, and the bottom of the valve disc 6 is arranged in a shape matching the slits. Under the action of fluid pressure, the contact between the valve disc and the valve seat is more closely, and the oblique slits can guide the valve disc to be better positioned, so that the sealing surface between the valve disc and the valve seat is uniformly stressed.

[0023] As a further preferred embodiment, the top of the valve rod 3 is threadedly connected with a valve rod nut 8, which is located at the upper end of the hand wheel 4.

[0024] The preferred embodiments of the present application are described in detail above. It should be understood that those skilled in the art can make many modifications and changes without creative labor according to the concept of the present application. Therefore, any technical solution obtained by logical analysis, reasoning or limited experiment on the basis of the existing technology according to the concept of the present application shall be within the protection scope defined by the claims.

Claims

1. A swivel-type lift valve connector, comprising: The valve body, the valve cover, the valve stem, the valve disc, the flow channel, the valve seat, the valve stem cavity, the push piece, the flow guide plate, the sliding part, the circular plate, the C-shaped sealing ring, and the valve rod nut are all arranged in the valve.

2. A rotary valve coupling according to claim 1, wherein, The middle part of the sliding part is fixed with a circular plate, the outer side of the circular plate is provided with a C-shaped sealing ring, the C-shaped sealing ring is attached to the inner wall of the valve stem cavity, and the C-shaped sealing ring is located above the flow guide plate.

3. A rotary valve coupling according to claim 1, wherein, The two sides of the valve seat are provided with an oblique gap, and the bottom of the valve disc is provided with a shape matching the gap.

4. A rotary valve coupling according to claim 1, wherein, The top of the valve stem is provided with a valve stem nut, and the valve stem nut is located at the upper end of the hand wheel.

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