Multistage hard sealing eccentric plug valve

Abstract

The invention provides a multistage hard sealing eccentric plug valve, and relates to the field of valves. A plug valve cover is arranged on the top end surface of the plug valve body; a plug valve rod is arranged in the plug valve cover; the upper part of the plug valve rod is fixedly connected with a control handle; an eccentric plug body is arranged at the lower part of the plug valve rod; the eccentric plug body is arranged in the plug valve body; the left part of the plug valve body is in threaded connection with an internal thread valve cavity; the internal thread valve cavity is aligned with the eccentric cock body in position; and two groups of mounting threaded holes are symmetrically formed in the outer part of the plug valve body in an annular array shape. When a limiting vertical plate makes contact with an auxiliary base, a stop base can penetrate through an auxiliary groove and extrude a limiting wedge block, then through a series of transmission, the limiting wedge block is inserted into the stop groove to limit a plug valve rod, and the problems that when a worker operates in a narrow space, an adjacent valve handle is likely to be touched by mistake, unexpected opening and closing of a valve are caused, and the working efficiency is high are solved. And the abrasion of the eccentric plug valve is accelerated.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and particularly to a multi-stage hard-sealed eccentric plug valve. Background Art

[0002] In water and sewage systems, in order to achieve high energy efficiency and zero leakage, and solve the problems of blockage, corrosion and maintenance, workers usually select an eccentric plug valve with low flow resistance, low cost and strong anti-junk ability as the main valve in the system. Existing eccentric plug valves usually consist of a valve cover, a valve body, a valve stem, a plug body, an internal thread valve cavity and multi-level sealing rings.

[0003] For example: The utility model with the application number CN201922275913.5 discloses a multi-level hard-sealed eccentric plug valve. Specifically, the present utility model relates to a multi-level hard-sealed eccentric plug valve, including a valve body, a valve cover arranged on the upper part of the valve body, a plug body arranged in the flow channel of the valve body, and an operating machine for driving the plug body. A valve seat is arranged in the valve body to form a sealing pair with the outer arc surface of the plug body, and multi-level sealing rings for cooperating with the valve seat are arranged on the outer arc surface of the plug body. Compared with the prior art, the present utility model has the advantages of combining hard and soft seals, good sealing performance, compensating for machining shape and position errors, long service life, the specification and caliber not being limited by the rubber pressing mold, and low R & D investment cost.

[0004] However, during the use of existing eccentric plug valves, in order to facilitate the opening and closing of the eccentric plug valves, the handles of the eccentric plug valves are usually exposed, which makes it easy for workers to accidentally touch the handles of adjacent valves during operation in a narrow space, resulting in unexpected opening and closing of the valves, accelerating the wear of the eccentric plug valves and causing damage to the eccentric plug valves, making it inconvenient to use. Summary of the Invention

[0005] In view of this, the present invention provides a multi-stage hard-sealed eccentric plug valve, which has a stop seat and a limit wedge block that can automatically limit the valve stem of the eccentric plug valve at the limit position of the eccentric plug valve. During the process of the plug valve stem controlling the rotation of the eccentric plug body, as the eccentric plug body is fully opened, the limit vertical plate will contact the auxiliary seat to limit the plug valve stem. At the same time, after the eccentric plug body is fully closed, it will also contact the auxiliary seat to limit the plug valve stem. When the limit vertical plate contacts the auxiliary seat, the stop seat will pass through the auxiliary groove and squeeze the limit wedge block, causing the limit wedge block to drive the sliding seat to slide in the installation box and squeeze the limit spring. When the limit vertical plate is in full contact with the auxiliary seat, the sliding seat will rebound with the elasticity of the limit spring itself, causing the limit wedge block to insert into the stop groove to limit the plug valve stem. When it is necessary to rotate the plug valve stem, only need to pull the connecting slide frame, causing the connecting slide frame to drive the sliding seat to slide in the installation box, so that the limit wedge block disengages from the stop groove, and only then can the plug valve stem be rotated.

[0006] The present invention provides the purpose and efficacy of a multi-stage hard-sealed eccentric plug valve, specifically including: a plug valve body; a plug valve cover is arranged on the top surface of the plug valve body; a plug valve stem is arranged inside the plug valve cover; a control handle is fixedly connected to the upper part of the plug valve stem; an eccentric plug body is arranged at the lower part of the plug valve stem; the eccentric plug body is arranged inside the plug valve body; the left part of the plug valve body is threadedly connected with an internal thread valve cavity; the internal thread valve cavity is aligned with the position of the eccentric plug body; two groups of installation threaded holes are symmetrically arranged in an annular array on the outside of the plug valve body; two anti-pollution protective shells are symmetrically arranged on the outside of the plug valve body; the two groups of installation threaded holes are respectively aligned with the positions of the two anti-pollution protective shells; four spline columns are inserted in a matrix array inside the plug valve cover; four limiting columns are fixedly connected in a rectangular array at the upper part of the plug valve body; the ends of the four spline columns are respectively fixedly connected inside the four limiting columns.

[0007] Further, a pressure self-tightening ring is arranged at the right part of the internal thread valve cavity; an auxiliary sealing ring is arranged at the right part of the pressure self-tightening ring; a conical surface sealing ring is arranged at the right part of the auxiliary sealing ring; the conical surface sealing ring is in contact with the outer wall of the eccentric plug body.

[0008] Further, four fixing sliders are slidably connected in a rectangular array on the top surface of the plug valve cover; an auxiliary spring is fixedly connected to the inner side of each of the four fixing sliders; the ends of the four auxiliary springs are respectively fixedly connected inside the plug valve cover; a limiting slide frame is fixedly connected to the outer side of each of the four fixing sliders; the four limiting slide frames are respectively aligned with the positions of the four spline columns; a spline groove is opened in each of the four limiting slide frames; the four spline columns are respectively inserted into the four spline grooves.

[0009] Further, an anti-loosening plug rod is inserted into each of the four fixing sliders; four fixing vertical plates are fixedly connected in a rectangular array on the top surface of the plug valve cover; the four fixing vertical plates are respectively aligned with the positions of the four fixing sliders; the four anti-loosening plug rods are respectively slidably connected inside the four fixing vertical plates; a return spring is fixedly connected to the inner side of each of the four anti-loosening plug rods; the ends of the four return springs are respectively fixedly connected to the outside of the four fixing vertical plates.

[0010] Furthermore, a set of fixing seats are fixedly connected to the outside of each of the two anti-fouling protective shells; a set of locking sliding frames are slidably connected within each of the two sets of fixing seats; a set of guiding sliding plates are fixedly connected to the outside of each of the two sets of locking sliding frames; a set of connecting springs are fixedly connected to the inner sides of the two sets of guiding sliding plates; the ends of the two sets of connecting springs are respectively fixedly connected within the two sets of fixing seats; a set of limiting insertion frames are slidably connected to the outside of each of the two sets of fixing seats; the two sets of limiting insertion frames are respectively inserted into the two sets of locking sliding frames; a set of fixing springs are fixedly connected to the outside of each of the two sets of limiting insertion frames; the ends of the two sets of fixing springs are respectively fixedly connected within the two sets of fixing seats; a transmission rack is fixedly connected to the inner side of each of the two sets of locking sliding frames; a set of limiting blocks are fixedly connected to the inner sides of the two sets of fixing seats; a set of auxiliary gears are coaxially fixedly connected to the outside of the rotation shafts of the two sets of limiting blocks; the two sets of auxiliary gears are respectively engaged with the two sets of transmission racks.

[0011] Furthermore, two metal rings are symmetrically arranged on the outside of the plug valve body; both of the two metal rings are hollow annular structures made of stainless steel; rubber rings are arranged within both of the two metal rings.

[0012] Furthermore, a limiting vertical plate is fixedly connected to the outside of the plug valve stem; two auxiliary seats are fixedly connected to the top surface of the plug valve cover; the positions of both of the two auxiliary seats are aligned with that of the limiting vertical plate.

[0013] Furthermore, two stop seats are symmetrically and fixedly connected to the outside of the limiting vertical plate; stop grooves are formed on the outside of both of the two stop seats; auxiliary grooves are formed on the outside of both of the two auxiliary seats; the positions of both of the two stop seats are aligned with those of the two auxiliary grooves; mounting boxes are fixedly connected to the outside of both of the two auxiliary seats; a sliding seat is slidably connected within each of the two sets of mounting boxes; a limiting wedge block is fixedly connected to the bottom end surface of each of the two sliding seats; the positions of both of the two limiting wedge blocks are aligned with those of the two stop grooves; a set of limiting springs are fixedly connected to the top end surface of each of the two sliding seats; the ends of the two sets of limiting springs are respectively fixedly connected within the two mounting boxes.

[0014] Furthermore, a connecting sliding frame is fixedly connected to the top end surface of each of the two sliding seats; the two connecting sliding frames are respectively slidably connected within the two mounting boxes.

[0015] Furthermore, two mounting blocks are symmetrically arranged on the outside of the internal-thread valve cavity; a mounting bolt is threadedly connected within each of the two mounting blocks; the ends of the two mounting bolts are respectively threadedly connected within the internal-thread valve cavity; a barrier filter screen is fixedly connected between the two mounting blocks; the position of the barrier filter screen is aligned with that of the internal-thread valve cavity.

[0016] Beneficial effects

[0017] During the use of the present invention, when it is necessary to separate the plug valve cover and the plug valve body, only need to pull the anti-loosening plug rod to make it disengage from the fixed slider. At this time, the staff can then move the fixed slider, so that the fixed slider drives the limit slide to move and compress the auxiliary spring, releasing the limit on the spline column. At this time, the staff can separate the plug valve cover and the plug valve body. The operation is simple and fast, effectively improving the convenience of the eccentric plug valve and making it more convenient to use.

[0018] The setting of the barrier filter prevents debris in the medium from entering the plug valve body. The setting of the mounting block and the mounting bolts facilitates the staff to replace the barrier filter, effectively improving the applicability of the eccentric plug valve.

[0019] During the process of the plug valve stem controlling the rotation of the eccentric plug body, as the eccentric plug body is fully opened, the limit vertical plate will contact the auxiliary seat to limit the plug valve stem. At the same time, after the eccentric plug body is fully closed, it will also contact the auxiliary seat to limit the plug valve stem, which is convenient for the staff to intuitively see the opening state of the eccentric plug valve. When the limit vertical plate contacts the auxiliary seat, the stop seat will pass through the auxiliary groove and squeeze the limit wedge block, and then through a series of transmissions, the limit wedge block will be inserted into the stop groove to limit the plug valve stem. This kind of limiting only at the extreme positions not only allows normal flow regulation but also provides protection at critical positions. When the staff rotates excessively unconsciously, the limiting device will forcibly stop, thus avoiding structural damage caused by misoperation, effectively improving the applicability of the eccentric plug valve, and at the same time can also effectively avoid the unexpected opening and closing of the valve caused by human accidental touch.

[0020] The setting of the anti-pollution protective shell can prevent dirt from entering the eccentric plug valve during the transportation of the eccentric plug valve. When the eccentric plug valve needs to be used, only need to move the limit insertion frame, and then through a series of transmissions, drive the limit block to rotate, so that the limit block releases the limit on the anti-pollution protective shell. At this time, the staff can remove the anti-pollution protective shell to ensure that the sealing surface remains intact during transportation, maintain good sealing performance, and at the same time can also keep the valve stem in a relatively clean environment, ensuring its flexible operation and facilitating the commissioning and use after installation. Brief Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below.

[0022] The drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention.

[0023] In the drawings:

[0024] Figure 1 is the axonometric structural schematic diagram of the present invention.

[0025] Figure 2 It is an axonometric structure schematic diagram after the anti-fouling housing of the present invention is separated.

[0026] Figure 3 It is an axonometric structure schematic diagram of the barrier filter of the present invention.

[0027] Figure 4 It is the present invention Figure 3 The enlarged structure schematic diagram at position A.

[0028] Figure 5 It is a sectional structure schematic diagram of the present invention.

[0029] Figure 6 It is the present invention Figure 5 The enlarged structure schematic diagram at position B.

[0030] Figure 7 It is a sectional structure schematic diagram of the cock valve cover of the present invention.

[0031] Figure 8 It is the present invention Figure 7 The enlarged structure schematic diagram at position C.

[0032] Figure 9 It is an axonometric structure schematic diagram of the auxiliary seat of the present invention.

[0033] Figure 10 It is an axonometric structure schematic diagram of the eccentric cock body of the present invention.

[0034] Figure 11 It is the present invention Figure 10 The enlarged structure schematic diagram at position D.

[0035] Figure 12 It is an axonometric structure schematic diagram of the cock valve cover of the present invention.

[0036] Figure 13 It is the present invention Figure 12 The enlarged structure schematic diagram at position E.

[0037] Figure 14 It is a sectional structure schematic diagram of the limit slide carriage of the present invention.

[0038] Figure 15 It is an axonometric structure schematic diagram of the fixed seat of the present invention.

[0039] Figure 16 It is the present invention Figure 15 The enlarged structure schematic diagram at position F.

[0040] List of reference numerals

[0041] 1. Plug valve body; 101. Plug valve cover; 102. Plug valve stem; 103. Control handle; 104. Eccentric plug body; 105. Internal thread valve cavity; 106. Pressure self-tightening ring; 107. Auxiliary sealing ring; 108. Tapered surface sealing ring; 109. Installation threaded hole; 110. Anti-pollution protective shell; 111. Fixed seat; 112. Guide slide plate; 113. Locking slide frame; 114. Limit block; 115. Auxiliary gear; 116. Driving rack; 117. Connecting spring; 118. Limit inserting frame; 119. Fixed spring; 120. Metal ring; 121. Rubber ring; 122. Installation block; 123. Barrier filter screen; 124. Installation bolt; 125. Spline column; 126. Limit column; 127. Limit slide frame; 128. Fixed slider; 129. Auxiliary spring; 130. Fixed vertical plate; 131. Anti-loosening insertion rod; 132. Return spring; 133. Spline groove; 134. Limit vertical plate; 135. Stop seat; 136. Stop groove; 137. Auxiliary seat; 138. Auxiliary groove; 139. Installation box; 140. Sliding seat; 141. Limit wedge block; 142. Limit spring; 143. Connecting slide frame. Detailed implementation mode

[0042] Example 1:

[0043] The present invention provides a multi-stage hard-sealed eccentric plug valve. Please refer to Figures 1 to 16 as shown in the figure, including: a plug valve body 1;

[0044] A plug valve cover 101 is arranged on the top surface of the plug valve body 1; a plug valve stem 102 is arranged inside the plug valve cover 101; a control handle 103 is fixedly connected to the upper part of the plug valve stem 102; an eccentric plug body 104 is arranged at the lower part of the plug valve stem 102; the eccentric plug body 104 is arranged inside the plug valve body 1; the left part of the plug valve body 1 is threadedly connected with an internal thread valve cavity 105; the internal thread valve cavity 105 is aligned with the position of the eccentric plug body 104; two groups of installation threaded holes 109 are symmetrically arranged in an annular array on the outside of the plug valve body 1; two anti-pollution protective shells 110 are symmetrically arranged on the outside of the plug valve body 1; the two groups of installation threaded holes 109 are respectively aligned with the positions of the two anti-pollution protective shells 110; four spline columns 125 are inserted in a matrix array inside the plug valve cover 101; four limit columns 126 are fixedly connected in a rectangular array at the upper part of the plug valve body 1; the ends of the four spline columns 125 are respectively fixedly connected inside the four limit columns 126.

[0045] Among them, a pressure self-tightening ring 106 is arranged on the right part of the internal thread valve cavity 105; an auxiliary sealing ring 107 is arranged on the right part of the pressure self-tightening ring 106; a tapered surface sealing ring 108 is arranged on the right part of the auxiliary sealing ring 107; the tapered surface sealing ring 108 is in contact with the outer wall of the eccentric plug body 104.

[0046] Among them, four fixed sliders 128 are slidably connected to the top surface of the plug valve cover 101 in a rectangular array; an auxiliary spring 129 is fixedly connected to the inner side of each of the four fixed sliders 128; the ends of the four auxiliary springs 129 are fixedly connected inside the plug valve cover 101; a limit slide frame 127 is fixedly connected to the outer side of each of the four fixed sliders 128; the positions of the four limit slide frames 127 are aligned with those of the four spline columns 125 respectively; a spline groove 133 is formed in each of the four limit slide frames 127; the four spline columns 125 are respectively inserted into the four spline grooves 133.

[0047] Among them, an anti-loosening plug rod 131 is inserted into each of the four fixed sliders 128; four fixed vertical plates 130 are fixedly connected to the top surface of the plug valve cover 101 in a rectangular array; the positions of the four fixed vertical plates 130 are aligned with those of the four fixed sliders 128 respectively; the four anti-loosening plug rods 131 are respectively slidably connected inside the four fixed vertical plates 130; a return spring 132 is fixedly connected to the inner side of each of the four anti-loosening plug rods 131; the ends of the four return springs 132 are respectively fixedly connected to the outside of the four fixed vertical plates 130.

[0048] Among them, a set of fixed seats 111 are fixedly connected to the outside of each of the two anti-pollution protective shells 110; a set of locking slide frames 113 are slidably connected inside the two sets of fixed seats 111; a set of guiding slide plates 112 are fixedly connected to the outside of the two sets of locking slide frames 113; a set of connecting springs 117 are fixedly connected to the inner side of the two sets of guiding slide plates 112; the ends of the two sets of connecting springs 117 are respectively fixedly connected inside the two sets of fixed seats 111; a set of limit plug frames 118 are slidably connected to the outside of the two sets of fixed seats 111; the two sets of limit plug frames 118 are respectively inserted into the two sets of locking slide frames 113; a set of fixed springs 119 are fixedly connected to the outside of the two sets of limit plug frames 118; the ends of the two sets of fixed springs 119 are respectively fixedly connected inside the two sets of fixed seats 111; a transmission rack 116 is fixedly connected to the inner side of each of the two sets of locking slide frames 113; a set of limit clamping blocks 114 are fixedly connected to the inner side of each of the two sets of fixed seats 111; a set of auxiliary gears 115 are coaxially fixedly connected to the outside of the shafts of the two sets of limit clamping blocks 114; the two sets of auxiliary gears 115 are respectively meshed with the two sets of transmission racks 116.

[0049] Among them, two metal rings 120 are symmetrically arranged on the outside of the plug valve body 1; the two metal rings 120 are both hollow annular structures made of stainless steel; rubber rings 121 are arranged inside the two metal rings 120.

[0050] Among them, a limit vertical plate 134 is fixedly connected to the outside of the plug valve rod 102; two auxiliary seats 137 are fixedly connected to the top surface of the plug valve cover 101; the positions of the two auxiliary seats 137 are aligned with those of the limit vertical plate 134 respectively.

[0051] Among them, two stop seats 135 are symmetrically and fixedly connected to the outside of the limit vertical plate 134; stop grooves 136 are formed in the outside of the two stop seats 135; auxiliary grooves 138 are formed in the outside of the two auxiliary seats 137; the positions of the two stop seats 135 are aligned with the positions of the two auxiliary grooves 138 respectively; mounting boxes 139 are fixedly connected to the outside of the two auxiliary seats 137; a sliding seat 140 is slidably connected in each of the two groups of mounting boxes 139; a limit wedge 141 is fixedly connected to the bottom end surface of each of the two sliding seats 140; the positions of the two limit wedges 141 are aligned with the positions of the two stop grooves 136 respectively; a group of limit springs 142 are fixedly connected to the top end surface of each of the two sliding seats 140; the ends of the two groups of limit springs 142 are fixedly connected in the two mounting boxes 139 respectively.

[0052] Among them, a connecting sliding frame 143 is fixedly connected to the top end surface of each of the two sliding seats 140; the two connecting sliding frames 143 are respectively slidably connected in the two mounting boxes 139.

[0053] Specific usage and function of this embodiment: In the present invention, the pressure self-tightening ring 106 is made of elastic metal, having both elasticity and corrosion resistance. It is driven by the medium pressure to radially deform and compress the sealing surface, enhancing the sealing specific pressure and achieving the dynamic self-tightening effect. The auxiliary sealing ring 107 is made of chromium stainless steel, with strong corrosion resistance and suitable for acidic or weakly alkaline media. As a redundant design, it compensates for the wear or deformation of the main seal. The conical surface sealing ring 108 is made of Stellite alloy, with extremely high temperature resistance and wear resistance. It directly blocks the medium and realizes contact sealing with the eccentric plug body 104 through the precisely machined conical surface, achieving multi-stage hard sealing of the eccentric plug valve. The control handle 103 facilitates the control of the plug valve stem 102. The setting of the spline column 125 can limit the plug valve body 1 and the plug valve cover 101. The setting of the limit slide 127 can block and limit the spline column 125, and the spline groove 133 in the limit slide 127 can well limit the spline column 125, keeping the position of the spline column 125 consistent all the time. The setting of the anti-loosening plug 131 can limit the limit slide 127, enabling the limit slide 127 to have a sufficient limiting effect on the spline column 125. When it is necessary to separate the plug valve cover 101 and the plug valve body 1, just pull the anti-loosening plug 131, so that the anti-loosening plug 131 slides in the fixed vertical plate 130 and stretches the return spring 132. As the anti-loosening plug 131 moves, it will disengage from the fixed slider 128. At this time, the staff can move the fixed slider 128, making the fixed slider 128 drive the limit slide 127 to move and compress the auxiliary spring 129, releasing the limit on the spline column 125. At this time, the staff can separate the plug valve cover 101 and the plug valve body 1 and perform maintenance and repair on the inside of the eccentric plug valve. The setting of the anti-pollution housing 110 can prevent dirt from entering the eccentric plug valve during the transportation of the eccentric plug valve. In the initial state, the connecting spring 117 is in a stretched state. When the eccentric plug valve needs to be used, move the limit insertion frame 118, so that the limit insertion frame 118 disengages from the locking slide 113 and compresses the fixed spring 119. After the limit insertion frame 118 disengages from the locking slide 113, the connecting spring 117 will rebound under the action of its own elastic potential energy. As the connecting spring 117 rebounds, it will drive the locking slide 113 to reset through the guiding slide plate 112. As the locking slide 113 resets, it will drive the transmission rack 116 to move. As the transmission rack 116 moves, it will drive the auxiliary gear 115 meshing with it to rotate. As the auxiliary gear 115 rotates, it will drive the limit block 114 to rotate, so that the limit block 114 releases the limit on the anti-pollution housing 110. At this time, the staff can remove the anti-pollution housing 110. The setting of the installation threaded hole 109 facilitates the connection of the eccentric plug valve. The metal ring 120 and the rubber ring 121 compensate for the deformation of the flange, keeping the sealing surface in good fit all the time and reducing the possibility of leakage.Meanwhile, it can also effectively absorb and dissipate the impact of the fluid and reduce noise. During the process of the plug valve stem 102 controlling the eccentric plug body 104 to rotate, as the eccentric plug body 104 is fully opened, the limiting vertical plate 134 will contact the auxiliary seat 137 to limit the plug valve stem 102. At the same time, after the eccentric plug body 104 is fully closed, it will also contact the auxiliary seat 137 to limit the plug valve stem 102, which is convenient for the staff to intuitively see the opening state of the eccentric plug valve. When the limiting vertical plate 134 contacts the auxiliary seat 137, the positioning seat 135 will pass through the auxiliary groove 138 and squeeze the limiting wedge block 141, causing the limiting wedge block 141 to drive the sliding seat 140 to slide in the installation box 139 and squeeze the limiting spring 142. When the limiting vertical plate 134 is in full contact with the auxiliary seat 137, the sliding seat 140 will rebound with the elasticity of the limiting spring 142 itself, causing the limiting wedge block 141 to insert into the positioning groove 136 to limit the plug valve stem 102. When it is necessary to rotate the plug valve stem 102, only need to pull the connecting slide 143, so that the connecting slide 143 drives the sliding seat 140 to slide in the installation box 139, making the limiting wedge block 141 disengage from the positioning groove 136. Only at this time can the plug valve stem 102 be rotated.,

[0054] Embodiment 2:

[0055] On the basis of Embodiment 1, please refer to Figures 1 to 4 As shown in the figure, it includes: mounting blocks 122, a barrier filter 123 and mounting bolts 124. Two mounting blocks 122 are symmetrically arranged outside the internal-thread valve cavity 105; a mounting bolt 124 is threadedly connected in each of the two mounting blocks 122; the ends of the two mounting bolts 124 are threadedly connected in the internal-thread valve cavity 105; a barrier filter 123 is fixedly connected between the two mounting blocks 122; the barrier filter 123 is aligned with the internal-thread valve cavity 105.

[0056] The specific usage method and function of this embodiment: In the present invention, the barrier filter 123 is made of high-strength metal material, and the size of the mesh holes is determined according to the size of foreign objects in the medium, preventing debris in the medium from entering the plug valve body 1. The setting of the mounting blocks 122 and the mounting bolts 124 facilitates the staff to replace the barrier filter 123.

[0057] In this article, the following points need to be noted:

[0058] 1. The drawings of the embodiments of the present disclosure only relate to the structures involved in the embodiments of the present disclosure. Other structures can refer to the general design.

[0059] 2. Without conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0060] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present disclosure can easily think of changes or substitutions, which should all be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A multi-stage hard-sealed eccentric plug valve, comprising: Plug valve body (1); a plug valve cover (101) is provided on the top surface of the plug valve body (1); a plug valve stem (102) is provided inside the plug valve cover (101); characterized in that, a control handle (103) is fixedly connected to the upper part of the plug valve stem (102); an eccentric plug body (104) is provided at the lower part of the plug valve stem (102); the eccentric plug body (104) is arranged inside the plug valve body (1); a female threaded valve cavity (105) is threadedly connected to the left part of the plug valve body (1); the female threaded valve cavity (105) is aligned with the position of the eccentric plug body (104); two sets of mounting threaded holes (109) are symmetrically arranged in a circular array on the outside of the plug valve body (1); two anti-pollution protective shells (110) are symmetrically arranged on the outside of the plug valve body (1); the two sets of mounting threaded holes (109) are respectively aligned with the positions of the two anti-pollution protective shells (110); four spline columns (125) are inserted in a matrix array inside the plug valve cover (101); four limiting columns (126) are fixedly connected in a rectangular array at the upper part of the plug valve body (1); the ends of the four spline columns (125) are respectively fixedly connected inside the four limiting columns (126).

2. The multi-stage hard-sealed eccentric plug valve according to claim 1, wherein: A pressure self-tightening ring (106) is provided at the right part of the female threaded valve cavity (105); an auxiliary sealing ring (107) is provided at the right part of the pressure self-tightening ring (106); a conical sealing ring (108) is provided at the right part of the auxiliary sealing ring (107); the conical sealing ring (108) contacts the outer wall of the eccentric plug body (104).

3. The multi-stage hard-sealed eccentric plug valve according to claim 1, characterized in that: Four fixing sliders (128) are slidably connected in a rectangular array on the top surface of the plug valve cover (101); an auxiliary spring (129) is fixedly connected to the inner side of each of the four fixing sliders (128); the ends of the four auxiliary springs (129) are respectively fixedly connected inside the plug valve cover (101); a limiting slide frame (127) is fixedly connected to the outer side of each of the four fixing sliders (128); the four limiting slide frames (127) are respectively aligned with the positions of the four spline columns (125); a spline groove (133) is formed in each of the four limiting slide frames (127); the four spline columns (125) are respectively inserted into the four spline grooves (133).

4. The multi-stage hard-sealed eccentric plug valve according to claim 3, wherein: A loosening prevention insertion rod (131) is inserted into each of the four fixing sliders (128); four fixing vertical plates (130) are fixedly connected in a rectangular array on the top surface of the plug valve cover (101); the four fixing vertical plates (130) are respectively aligned with the positions of the four fixing sliders (128); the four loosening prevention insertion rods (131) are respectively slidably connected inside the four fixing vertical plates (130); a return spring (132) is fixedly connected to the inner side of each of the four loosening prevention insertion rods (131); the ends of the four return springs (132) are respectively fixedly connected to the outside of the four fixing vertical plates (130).

5. The multi-stage hard-sealed eccentric plug valve according to claim 1, characterized in that: A set of fixing seats (111) are fixedly connected to the outside of each of the two anti-pollution protective shells (110); a set of locking sliders (113) are slidably connected inside the two sets of fixing seats (111); a set of guiding sliders (112) are fixedly connected to the outside of the two sets of locking sliders (113); a set of connecting springs (117) are fixedly connected to the inner sides of the two sets of guiding sliders (112); the ends of the two sets of connecting springs (117) are respectively fixedly connected inside the two sets of fixing seats (111); a set of limiting insertion frames (118) are slidably connected to the outside of the two sets of fixing seats (111); the two sets of limiting insertion frames (118) are respectively inserted into the two sets of locking sliders (113); a set of fixing springs (119) are fixedly connected to the outside of the two sets of limiting insertion frames (118); the ends of the two sets of fixing springs (119) are respectively fixedly connected inside the two sets of fixing seats (111); a transmission rack (116) is fixedly connected to the inner side of each of the two sets of locking sliders (113); a set of limiting blocks (114) are fixedly connected to the inner side of each of the two sets of fixing seats (111); a set of auxiliary gears (115) are coaxially fixedly connected to the outside of the shafts of the two sets of limiting blocks (114); the two sets of auxiliary gears (115) are respectively meshed with the two sets of transmission racks (116).

6. The multi-stage hard-sealed eccentric plug valve according to claim 1, characterized in that: Two metal rings (120) are symmetrically arranged on the outside of the cock valve body (1); the two metal rings (120) are both hollow annular structures made of stainless steel; rubber rings (121) are arranged inside the two metal rings (120).

7. The multi-stage hard-sealed eccentric plug valve according to claim 1, characterized in that: A limiting vertical plate (134) is fixedly connected to the outside of the cock valve stem (102); two auxiliary seats (137) are fixedly connected to the top end surface of the cock valve cover (101); the two auxiliary seats (137) are aligned with the position of the limiting vertical plate (134).

8. The multi-stage hard-sealed eccentric plug valve according to claim 7, characterized in that: Two stop seats (135) are symmetrically fixedly connected to the outside of the limiting vertical plate (134); stop grooves (136) are formed on the outside of the two stop seats (135); auxiliary grooves (138) are formed on the outside of the two auxiliary seats (137); the two stop seats (135) are respectively aligned with the positions of the two auxiliary grooves (138); mounting boxes (139) are fixedly connected to the outside of the two auxiliary seats (137); a sliding seat (140) is slidably connected inside each of the two sets of mounting boxes (139); a limiting wedge block (141) is fixedly connected to the bottom end surface of each of the two sliding seats (140); the two limiting wedge blocks (141) are respectively aligned with the positions of the two stop grooves (136); a set of limiting springs (142) are fixedly connected to the top end surface of each of the two sliding seats (140); the ends of the two sets of limiting springs (142) are respectively fixedly connected inside the two sets of mounting boxes (139).

9. The multi-stage hard-sealed eccentric plug valve according to claim 8, wherein: A connecting slider (143) is fixedly connected to the top end surface of each of the two sliding seats (140); the two connecting sliders (143) are respectively slidably connected inside the two sets of mounting boxes (139).

10. The multi-stage hard-sealed eccentric plug valve according to claim 1, characterized in that: Two mounting blocks (122) are symmetrically arranged outside the internal-thread valve cavity (105); a mounting bolt (124) is threadedly connected in each of the two mounting blocks (122); the ends of the two mounting bolts (124) are threadedly connected in the internal-thread valve cavity (105); a barrier filter screen (123) is fixedly connected between the two mounting blocks (122); the barrier filter screen (123) is aligned with the internal-thread valve cavity (105).

Images