Linkage extension sealing gate valve

Abstract

The utility model relates to the technical field of valves, in particular to a linkage stretching sealing gate valve which comprises a valve body and a threaded valve cover arranged at the top of the valve body, an inner cavity of the valve body is provided with an opening and closing piece, the outer wall of the top of the opening and closing piece is connected with the inner wall of the threaded valve cover in a meshed mode, and the opening and closing piece comprises a lifting screw connected with the inner wall of the threaded valve cover in a meshed mode. An outer thread is arranged on the outer wall of the lifting screw, an extension valve plate is fixedly arranged at the bottom of the lifting screw, an inner thread is arranged in an inner cavity of the lifting screw, a downward pressing rod which extends downwards is arranged at the top of the lifting screw, the outer wall of the downward pressing rod is connected with the inner thread in a meshed mode, and the bottom of the downward pressing rod penetrates through the bottom end of the lifting screw and extends into an inner cavity of the extension valve plate. A closed air cavity is formed in an inner cavity of the extending valve plate, a pressing piston fixedly connected with the bottom end of the pressing rod is arranged on the inner wall of the closed air cavity in a sliding mode, a silica gel sealing block is arranged at the bottom of the closed air cavity, and an outward extending block fixedly connected with one side of the closed silica gel block is arranged at the bottom of the extending valve plate in a sliding mode.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field, concretely relates to a linkage stretch sealing gate valve. BACKGROUND

[0002] The valve is a pipeline accessory for opening and closing the pipeline, controlling flow direction, adjusting and controlling the parameters of the conveying medium. The valve can quickly control the flow of the fluid transported in the pipeline and control the opening and closing of the pipeline. It is widely used in life or production work. In the industrial field, a large number of raw material fluids need to be transported by pipeline. In order to better control the flow and transportation of the raw material fluid, the staff will install a valve on the pipeline, and then control the pipeline transportation through the valve, effectively improving the controllability of the pipeline transportation. Only rotation is needed to quickly open and close and control the fluid flow. It is simple and convenient to operate, and has strong applicability.

[0003] The gate valve is a kind of valve, and the opening and closing part is gate-shaped. The opening and closing part is raised and lowered by twisting the lifting rod, thereby controlling the opening and closing of the valve. It is simple in structure, convenient to use, and less in maintenance and cleaning steps, and is widely used in various pipelines.

[0004] Although the above-mentioned prior art can solve the corresponding technical problems, there are still some defects: the valve plate of the existing gate valve will repeatedly move relative to the inner cavity of the valve body after a period of use, causing wear. As the wear intensifies, it is easy to cause a gap between the valve plate and the inner cavity of the valve body, thereby affecting the sealing effect of the gate valve and shortening the service life. After wear, the valve plate often needs to be removed from the inner cavity of the valve body and replaced, which is very cumbersome to maintain. UTILITY MODEL CONTENTS

[0005] The utility model aims at the defects and deficiencies of the prior art, and provides a linkage stretch sealing gate valve with long service life and long maintenance cycle.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a linkage stretch sealing gate valve, comprising a valve body and a threaded valve cover arranged at the top of the valve body, the inner cavity of the valve body is provided with an opening and closing part engaged and connected with the inner wall of the threaded valve cover, the opening and closing part comprises a lifting screw rod engaged and connected with the inner wall of the threaded valve cover, the outer wall of the lifting screw rod is provided with an external thread, the bottom of the lifting screw rod is fixedly provided with a stretch valve plate, the inner cavity of the lifting screw rod is provided with an internal thread, the top of the lifting screw rod is provided with a downward extending lower pressing rod, the outer wall of which is engaged and connected with the internal thread, the lower pressing rod penetrates the bottom end of the lifting screw rod and extends into the inner cavity of the stretch valve plate, the inner cavity of the stretch valve plate is provided with a closed air cavity, the inner wall of the closed air cavity is slidably provided with a lower pressing piston fixedly connected with the bottom end of the lower pressing rod, the bottom of the closed air cavity is provided with a silica gel sealing block, and the bottom of the stretch valve plate is slidably provided with an outer extension block fixedly connected with one side of the silica gel sealing block.

[0007] Further improvement is that the valve body is provided with connecting flanges on both sides.

[0008] Further improvement is that the lifting screw is provided with a first handle at the top.

[0009] Further improvement is that the pressing rod is provided with a second handle at the top.

[0010] Further improvement is that the extension valve plate is provided with a sealing sliding groove at the bottom, and the outer extension block top surface is in sealing and sliding connection with the sealing sliding groove inner cavity.

[0011] Further improvement is that the outer wall of the outer extension block is provided with a plurality of sealing rings.

[0012] After the above technical scheme is used, the beneficial effects of the present application are as follows: when the extension valve plate bottom is worn and a gap is generated between the extension valve plate bottom and the valve body after long-term use, the pressing rod can be rotated to move downward along the internal thread and press the pressing piston, and then the air pressure in the closed air cavity is used to push outward, and the outer extension block of the extension valve plate bottom is linked and extended to be attached to the valve body inner cavity, so that the sealing effect is achieved, and the service life is longer without frequent maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor under the premise of the drawings.

[0014] Fig. 1 is a structure schematic view of the gate valve front view section of the present application;

[0015] Fig. 2 is a structure schematic view of the opening and closing part front view section of the present application. DETAILED DESCRIPTION

[0016] The present application will be further described in combination with the drawings and specific embodiments.

[0017] Referring to Figs. 1-2The technical scheme adopted in the embodiment is shown as follows: a linkage expansion sealing gate valve, comprising a valve body 1 and a threaded valve cover 4 arranged on the top of the valve body 1, an opening and closing member 2 is arranged in the inner cavity of the valve body 1 and is connected with the inner wall of the threaded valve cover 4, the opening and closing member 2 comprises a lifting screw rod 22 connected with the inner wall of the threaded valve cover 4, the outer wall of the lifting screw rod 22 is provided with an external thread 26, the bottom of the lifting screw rod 22 is fixedly provided with an expansion valve plate 21, the inner cavity of the lifting screw rod 22 is provided with an internal thread 25, the top of the lifting screw rod 22 is provided with a downward extending pressing rod 27, the bottom of the pressing rod 27 penetrates the bottom end of the lifting screw rod 22 and extends into the inner cavity of the expansion valve plate 21, the inner cavity of the expansion valve plate 21 is provided with a closed air cavity 24, the inner wall of the closed air cavity 24 is slidably provided with a pressing piston 29 fixedly connected with the bottom end of the pressing rod 27, the bottom of the closed air cavity 24 is provided with a silica gel sealing block 30, the bottom of the expansion valve plate 21 is slidably provided with an outward extending block 23 fixedly connected with one side of the silica gel sealing block 30, in use, the external thread 26 of the lifting screw rod 22 is engaged with the threaded valve cover 4 by rotating the lifting screw rod 22, so as to control the rising and falling of the expansion valve plate 21 and the opening and closing of the inner cavity of the valve body 1, after long-term use, if the bottom of the expansion valve plate 21 is worn and a gap is generated between the expansion valve plate 21 and the valve body 1, the pressing rod 27 can be rotated to move downward along the internal thread 25 and press the pressing piston 29, so that the air pressure in the closed air cavity 24 is increased and applied to the outward extending block 23 to push the outward extending block 23 outward, so as to link and expand the outward extending block 23 at the bottom of the expansion valve plate 21 to fit in the inner cavity of the valve body 1, so as to achieve the effect of closing, and the valve does not need to be maintained frequently, so as to prolong the service life;

[0018] The valve body 1 is provided with a connecting flange 3 on both sides, which is beneficial to the connection of the valve body 1 and external pipelines;

[0019] The top of the lifting screw rod 22 is provided with a first handle 5, which is beneficial to the rotation of the lifting screw rod 22;

[0020] The top of the pressing rod 27 is provided with a second handle, which is beneficial to the rotation of the pressing rod 27;

[0021] The bottom of the expansion valve plate 21 is provided with a sealing sliding groove 28, the top surface of the outward extending block 23 is sealingly and slidably connected with the inner cavity of the sealing sliding groove 28, which is beneficial to the control of the sliding track of the outward extending block 23 and prevents the outward extending block 23 from being separated from the expansion valve plate 21;

[0022] The outer wall of the outward extending block 23 is provided with a plurality of sealing rings, which is beneficial to the sealing effect.

[0023] The utility model discloses a working principle: the utility model uses, through the rotation of elevating screw rod 22, make the outer thread 26 of elevating screw rod 22 and the engagement of screw cap 4, and then control the rising and falling of extension valve plate 21, and then control the opening and closing of valve body 1 inner chamber, after long -term use, if the extension valve plate 21 bottom produces abrasion and generates the gap between valve body 1, at this time can rotate down pressure rod 27, make it along the female thread 25 and move down and extrude down pressure piston 29, and then through the air pressure in closed air cavity 24 is high, and applies on the outer extension block 23, and the outer extension block 23 is pushed out outward, and then make the extension of extension valve plate 21 bottom's outer extension block 23 linkage, and the in-cavity of valve body 1 is attached, reaches the effect of closing, and then need not often maintain, makes the service life longer.

[0024] The utility model wants to protect the structure of product, and the model of each element is not the content of the utility model protection, and is the prior art, and the element that can realize the function of the utility model on the market can be as a kind of selection application.Therefore the model of element and other parameters are not detailed in the utility model.The contribution of the utility model is that each element is combined scientifically.

[0025] The basic principle and main features of the utility model and its advantages are shown and described above, and the skilled person in the art should understand that the utility model is not limited to the above examples, and the above examples and description only illustrate the principle of the utility model, and various changes and improvements can be made to the utility model without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed, and the scope of protection of the utility model is defined by the appended claims and their equivalents.The utility model is not detailed, and all are the prior art of the skilled person.

Claims

1. A linkage extension sealing gate valve, comprising a valve body (1) and a threaded valve cover (4) disposed on the top of the valve body (1), wherein the inner cavity of the valve body (1) is provided with an opening and closing element (2) whose top outer wall engages with the inner wall of the threaded valve cover (4), the opening and closing element (2) comprising a lifting screw (22) engaging with the inner wall of the threaded valve cover (4), the outer wall of the lifting screw (22) being provided with an external thread (26), and an extension valve plate (21) fixedly disposed at the bottom of the lifting screw (22), characterized in that: The inner cavity of the lifting screw (22) is provided with an internal thread (25). The top of the lifting screw (22) is provided with a downward extending rod (27) whose outer wall is engaged with the internal thread (25). The bottom of the downward rod (27) penetrates the bottom end of the lifting screw (22) and extends to the inner cavity of the extension valve plate (21). The inner cavity of the extension valve plate (21) is provided with a closed air cavity (24). The inner wall of the closed air cavity (24) is provided with a downward piston (29) that is fixedly connected to the bottom end of the downward rod (27). The bottom of the closed air cavity (24) is provided with a silicone sealing block (30). The bottom of the extension valve plate (21) is provided with an external extension block (23) that is fixedly connected to one side of the silicone sealing block (30).

2. The linkage extension sealing gate valve according to claim 1, characterized in that: The valve body (1) is provided with connecting flanges (3) on both sides.

3. The linkage extension sealing gate valve according to claim 1, characterized in that: The lifting screw (22) is provided with a first handle (5) at the top.

4. The linkage extension sealing gate valve according to claim 1, characterized in that: The top of the pressure rod (27) is provided with a second handle.

5. The linkage extension sealing gate valve according to claim 1, characterized in that: The bottom of the extension valve plate (21) is provided with a sealing sliding groove (28), and the top surface of the extension block (23) is fitted and sealed with the inner cavity of the sealing sliding groove (28) and slidably connected.

6. A linkage extension sealing gate valve according to claim 1 or 5, characterized in that: The outer wall of the extended block (23) is fitted with several sealing rings.

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