Plug valve

Abstract

A plug valve comprises a valve body (1), a water inlet channel and a water outlet channel are arranged at the left end and the right end of the valve body (1) respectively, a cavity communicated with the water inlet channel and the water outlet channel is formed in the middle of the valve body (1), a valve clack (2) is arranged in the cavity, a plastic layer (3) wraps the valve clack (2), a valve cover (4) is arranged at the top of the valve body (1), and a valve rod (5) connected with the valve clack (2) is arranged on the valve cover (4). A valve rod sealing assembly (6) is arranged on the valve cover (4), a movable limiting block (7) is arranged on the valve rod (5), and a limiting groove (8) matched with the movable limiting block (7) is formed in the valve cover (4). The utility model has the advantages that the plastic layer is wrapped on the valve clack casting, the process is simple, the cost is low, and the sealing effect can be effectively improved; and the movable limiting block is matched with the limiting groove, so that the valve clack can be automatically locked in a closed state, and closing failure caused by false touch is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, and particularly relates to a plug valve. Background Art

[0002] A plug valve is a common valve with a plug body having a through hole as an opening and closing member, and is widely used. The existing manual plug valve lacks a self-locking function, and when accidentally touched, the position of the valve flap will change, thus affecting the throttling accuracy. Especially for large plug valves used in water utilization, the valve flaps mostly adopt hard seals, which have high process requirements and increase their production costs. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a plug valve aiming at the above deficiencies.

[0004] The utility model includes a valve body. Water inlet channels and water outlet channels are respectively arranged at the left and right ends of the valve body. A cavity communicating with the water inlet channel and the water outlet channel is arranged in the middle of the valve body, and a valve flap is arranged in the cavity. A plastic layer is wrapped outside the valve flap. A valve cover is arranged at the top of the valve body, and a valve rod connected to the valve flap is arranged on the valve cover. A valve rod sealing assembly is arranged on the valve cover. A movable limit block is arranged on the valve rod, and a limit groove matched with the movable limit block is arranged on the valve cover.

[0005] A filter bucket is arranged in the water inlet channel. The filter bucket is movably inserted into the water inlet channel. A sewage discharge port is arranged on the side wall of the filter bucket near the bottom end. A sewage discharge pipe communicating with the sewage discharge port is arranged on the water inlet channel, and a sewage discharge valve is arranged on the sewage discharge pipe.

[0006] The bottom end of the filter bucket is inclined, and the sewage discharge port is arranged on the side wall of the filter bucket at the lower end.

[0007] The valve rod sealing assembly includes a lower seal, an upper seal and a compression spring. A valve rod installation hole is arranged on the valve cover. A lower seal installation groove and an upper seal installation groove are respectively arranged in the valve rod installation hole. The lower seal and the upper seal are respectively installed in the corresponding lower seal installation groove and upper seal installation groove. A spring compression nut is screwed at one end of the top of the valve rod installation hole. The compression spring is sleeved on the valve rod and is located between the spring compression nut and the upper seal.

[0008] A group of annular grooves are arranged on the inner side walls of the lower seal and the upper seal.

[0009] An annular pressing block is arranged between the compression spring and the upper seal.

[0010] A hinge support is arranged on the valve rod. The movable limit block is hinged to the hinge support through a pin shaft. Inclined surfaces matched with each other are arranged on one side of the limit groove and the movable limit block.

[0011] A magnet for magnetically adsorbing the movable limit block is arranged on the hinge support.

[0012] The advantages of the present utility model are as follows: Wrapping a plastic layer on the valve flap casting has a simple process and low cost, and can effectively improve its sealing effect; the cooperation between the movable limit block and the limit groove enables the valve flap to lock itself in the closed state, preventing the closing failure caused by accidental triggering. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural view of the first perspective of the present utility model.

[0014] Figure 2 is Figure 1 a schematic view of a partially enlarged structure.

[0015] Figure 3 is a schematic view of the structure of the movable limit block and the limit groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated herein can be arranged and designed in various different configurations.

[0017] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the present utility model claimed, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model. It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0018] In the description of the embodiments of the present utility model, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, in the description of the present utility model, if terms such as "first", "second", etc. are used only for distinguishing descriptions, they cannot be understood as indicating or implying relative importance.

[0019] In the description of the embodiments of the present utility model, it should also be noted that unless otherwise clearly specified and defined, if the terms "set" and "connected" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0020] As shown in the attached drawings, the present utility model includes a valve body 1. Water inlet channels and water outlet channels are respectively provided at the left and right ends of the valve body 1. A cavity communicating with the water inlet channel and the water outlet channel is provided in the middle of the valve body 1. A valve flap 2 is provided in the cavity. A plastic layer 3 is wrapped outside the valve flap 2. A valve cover 4 is provided at the top of the valve body 1. A valve stem 5 connected to the valve flap 2 is provided on the valve cover 4. A valve stem sealing assembly 6 is provided on the valve cover 4. A movable limit block 7 is provided on the valve stem 5. A limit groove 8 cooperating with the movable limit block 7 is provided on the valve cover 4.

[0021] The valve flap 2 is a casting. The process of wrapping the plastic layer 3 on the outer surface of the casting is simple. A hard sealing strip is welded at the end of the water outlet channel of the valve body 1, which can cooperate with the plastic layer 3 to achieve a good sealing effect.

[0022] The valve cover 4 is detachably installed on the valve body 1 through a set of screws. The valve cover 4 and the valve body 1 are sealed through a sealing ring. The cooperation of the movable limit block 7 and the limit groove 8 is used to limit the valve flap 2 in the sealed state to prevent the valve flap 2 from loosening due to accidental touch. When the movable limit block 7 rotates with the valve stem 5 to the position of the limit groove 8, the valve flap 2 is in a fully sealed state. At this time, the movable limit block 7 enters the limit groove 8, making the valve stem 5 in a locked state, which can effectively prevent the valve flap 2 from loosening due to accidental touch.

[0023] Furthermore, a filter bucket 10 is provided in the water inlet channel. The filter bucket 10 is movably inserted into the water inlet channel. A sewage discharge port 11 is provided on the side wall of the filter bucket 10 near the bottom end. A sewage discharge pipe 12 communicating with the sewage discharge port 11 is provided on the water inlet channel. A sewage discharge valve is provided on the sewage discharge pipe 12.

[0024] A circular protrusion is provided in the water inlet channel for limiting the filter bucket 10. The top of the filter bucket 10 is open, and the bottom of the filter bucket 10 is a filter screen. In this case, the filter bucket 10 is placed horizontally. After the water flows in, it is first filtered by the filter bucket 10, which can prevent the sand and gravel in the water from entering the cavity of the valve body 1, avoid the wear of the sealing surface by the sand and gravel, and extend the service life of the valve. The sewage discharge valve can be opened regularly, and the sundries in the filter bucket 10 are discharged from the sewage discharge pipe 12.

[0025] Preferably, the bottom end of the filter bucket 10 is inclined, and the sewage discharge port 11 is located on the side wall of the filter bucket 10 at the lower end.

[0026] In this case, positioning holes are provided on the annular protrusion of the water inlet channel, and positioning blocks matching the positioning holes are provided at the bottom of the filter barrel 10, which facilitates the positioning during the installation of the filter barrel 10, so that the lower end of the inclined surface at the bottom end of the filter barrel 10 is located below, and the sewage outlet 11 and the sewage pipe 12 are aligned.

[0027] Preferably, the valve stem sealing assembly 6 includes a lower seal 15, an upper seal 16 and a compression spring 17. A valve stem mounting hole is provided on the valve cover 4, and a lower seal mounting groove and an upper seal mounting groove are respectively provided in the valve stem mounting hole. The lower seal 15 and the upper seal 16 are respectively installed in the corresponding lower seal mounting groove and upper seal mounting groove. One end at the top of the valve stem mounting hole is screwed with a spring compression nut 18, and the compression spring 17 is sleeved on the valve stem 5 and is located between the spring compression nut 18 and the upper seal 16.

[0028] The cross-sections of the lower seal 15 and the upper seal 16 are both L-shaped structures. The lower seal 15 and the upper seal 16 are symmetrically installed. The lower seal 15 is located at the bottom of the valve cover 4 and has an upward thrust under the water pressure to closely adhere to the lower seal mounting groove. The upper seal 16 has a downward pressure under the action of the compression spring 17 to closely adhere to the upper seal mounting groove. The spring compression nut 18 is threadedly connected to the valve cover 4, and the pressure of the compression spring 17 can be adjusted through the spring compression nut 18. The valve cover 4 and the valve stem 5 are sealed by the upper and lower seals, effectively improving the sealing performance.

[0029] Furthermore, a set of annular grooves 20 are provided on the inner side walls of the lower seal 15 and the upper seal 16. The annular grooves 20 can form multiple sealing segments on the inner side walls of the lower seal 15 and the upper seal 16, and have a certain expansion space when being squeezed, and can better fit with the valve stem 5.

[0030] Furthermore, an annular pressing block 22 is provided between the compression spring 17 and the upper seal 16. The annular pressing block 22 presses on the top of the upper seal 16, so that the pressure of the compression spring 17 can be applied to the upper seal 16 more evenly.

[0031] Furthermore, a hinge support 24 is provided on the valve stem 5, and the movable limit block 7 is hinged to the hinge support 24 through a pin shaft. The inclined surfaces that match each other are provided on one side of the limit groove 8 and the movable limit block 7.

[0032] The height of one side of the limiting groove 8 with an inclined surface is lower than that of the other side. When the movable limiting block 7 rotates to the position of the limiting groove 8, the cooperation of the two inclined surfaces causes the movable limiting block 7 to be lifted by one side of the limiting groove 8. When the movable limiting block 7 moves directly above the limiting groove 8, it will fall into the limiting groove 8 by itself. At this time, the valve stem 5 cannot continue to rotate in both forward and reverse directions. On the contrary, when opening, just push the movable limiting block 7 out of the limiting groove 8.

[0033] Furthermore, a magnet 25 for magnetically adsorbing the movable limiting block 7 is provided on the hinge support 24. When it is necessary to open, the movable limiting block 7 rotates upward and is adsorbed by the magnet 25, so as to avoid interference from the movable limiting block 7 when the valve stem 5 is rotated.

Claims

1. A plug valve, characterized in that The invention comprises a valve body (1), wherein the left and right ends of the valve body (1) are respectively provided with a water inlet channel and a water outlet channel, a cavity is respectively provided in the middle of the valve body (1) and is communicated with the water inlet channel and the water outlet channel, and a valve flap (2) is provided in the cavity, the valve flap (2) is covered with a plastic layer (3), a valve cover (4) is provided on the top of the valve body (1), a valve stem (5) connected to the valve flap (2) is provided on the valve cover (4), a valve stem sealing assembly (6) is provided on the valve cover (4), a movable limit block (7) is provided on the valve stem (5), and a limit groove (8) matched with the movable limit block (7) is provided on the valve cover (4).

2. A plug valve according to claim 1, characterized in that A filter barrel (10) is provided in the water inlet channel. The filter barrel (10) is movably plugged into the water inlet channel. A sewage outlet (11) is provided on the side wall of the filter barrel (10) near the bottom end. A sewage outlet pipe (12) communicating with the sewage outlet (11) is provided on the water inlet channel, and a sewage outlet valve is provided on the sewage outlet pipe (12).

3. A plug valve according to claim 2, characterized in that The bottom end of the filter barrel (10) is inclined, and the sewage outlet (11) is located on the side wall of the filter barrel (10) at the lower end.

4. A plug valve according to claim 1, characterized in that The valve stem sealing assembly (6) comprises a lower sealing member (15), an upper sealing member (16) and a compression spring (17). The valve cover (4) is provided with a valve stem mounting hole. A lower sealing member mounting groove and an upper sealing member mounting groove are respectively provided in the valve stem mounting hole. The lower sealing member (15) and the upper sealing member (16) are respectively installed in the corresponding lower sealing member mounting groove and the upper sealing member mounting groove. A spring compression nut (18) is screwed to one end of the top of the valve stem mounting hole. The compression spring (17) is sleeved on the valve stem (5) and is located between the spring compression nut (18) and the upper sealing member (16).

5. A plug valve according to claim 4, characterized in that The inner side walls of the lower sealing member (15) and the upper sealing member (16) are each provided with a group of annular grooves (20).

6. A plug valve according to claim 4, characterized in that An annular pressing block (22) is provided between the pressing spring (17) and the upper sealing member (16).

7. A plug valve according to claim 1, characterized in that A hinge support (24) is provided on the valve stem (5), and a movable limit block (7) is hinged on the hinge support (24) via a pin shaft. The limit groove (8) and one side of the movable limit block (7) are both provided with mutually matching inclined surfaces.

8. A plug valve according to claim 7, characterized in that A magnet (25) for magnetically adsorbing the movable limit block (7) is provided on the hinge support (24).

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