Knife gate valve body with axial sealing compensation function

Abstract

The invention relates to the technical field of knife gate valves, in particular to a knife gate valve body with an axial sealing compensation function. Comprising a valve body which is internally provided with a passing cavity for a medium to pass through and a first sliding groove which is communicated with the passing cavity, is close to the top of the valve body and is formed in the inner wall of the valve body; the sealing module is arranged in the containing groove of the valve body in a sliding mode, and the sealing module is used for blocking the passing cavity; the sealing module is provided with a fixed gate plate and a movable gate plate which are in sliding connection with each other; the control module is vertically arranged on the valve body and is close to the side edge of the valve body; the control module is provided with a pressure applying unit capable of driving the movable gate plate blocking the passing cavity in the axial direction of the passing cavity and a first driving unit capable of driving the pressure applying unit to conduct pressure applying operation. Efficient sealing can be provided, abrasion is not prone to being generated, operation is easy, and the sealing effect is good.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of knife gate valves, in particular to a knife gate valve body with axial sealing compensation function. BACKGROUND

[0002] The knife gate valve is widely used in the high solid content or high abrasive medium conveying pipeline of the metallurgy, mining, chemical industry, papermaking and sewage treatment industries due to its simple structure, flexible opening and closing and small flow resistance. The traditional knife gate valve usually relies on the movement of a single valve plate (gate plate) in the valve body cavity to achieve the opening and closing and sealing of the through cavity through the direct contact between the valve plate and the valve seat or sealing surface.

[0003] However, the prior art still has the following disadvantages: 1. Insufficient sealing reliability: The traditional knife gate valve generally adopts rigid sealing or elastic sealing structure. During the opening and closing of the valve plate, there is direct friction between the valve plate and the sealing surface, especially in the high solid content slurry or particle-containing medium working condition, which easily causes rapid wear of the sealing surface, resulting in sealing failure and medium leakage. 2. Limited sealing life: Since the rigid sealing method relies on the forced compression between the sealing pairs to achieve sealing, long-term frequent opening and closing will accelerate wear, causing the sealing performance of the valve body to gradually decrease, resulting in high maintenance cost and replacement frequency. 3. Large opening and closing resistance: In the slurry or particle medium environment, the valve plate is easily blocked or the resistance increases during operation, causing poor valve opening and closing, affecting the running stability. 4. Lack of compensation sealing ability: When the medium pressure fluctuates or there are hard particles inside, the single valve plate sealing method cannot effectively compensate for the sealing gap, further increasing the leakage risk. SUMMARY

[0004] In view of the above problems, the present application provides a knife gate valve body with axial sealing compensation function, which can not only close the pipeline but also prevent wear and leakage; thereby solving the technical problems of existing valve bodies that are prone to wear and leakage during long-term use.

[0005] To solve the problems of the prior art, the present application provides a knife gate valve body with axial sealing compensation function, comprising: a valve body, a through cavity for medium passing through is formed in the valve body, and a first sliding groove is formed in the inner wall of the valve body near the top of the valve body and communicates with the through cavity; a sealing module is slidably arranged in the accommodating groove of the valve body, and the sealing module is used to block the through cavity; the sealing module is provided with a fixed gate plate and a movable gate plate which are slidably connected with each other; a control module is vertically arranged on the valve body and is arranged near the side edge of the valve body; the control module is provided with a pressure applying unit capable of driving the movable gate plate blocking the through cavity axially along the through cavity and a first driving unit capable of driving the pressure applying unit to perform pressure applying operation.

[0006] Preferably, the valve body further comprises a sealing ring detachably arranged on the inner wall of the first sliding groove and coaxially arranged with the through cavity.

[0007] Preferably, the sealing module further comprises a second driving unit capable of driving the fixed gate and the movable gate to longitudinally slide in the first sliding groove; the second driving unit is vertically and centrally fixed on the top of the valve body and the driving end is fixedly connected with the fixed gate.

[0008] Preferably, the first sliding groove is composed of a first guide groove and a second guide groove longitudinally arranged on the top of the valve body, and the second guide groove is larger than the first guide groove.

[0009] Preferably, the bottom of the fixed gate and the top of the movable gate are further respectively provided with a sliding block and a second sliding groove; the sliding block is provided with two, and the two sliding blocks are arranged in parallel along the short side direction of the bottom of the fixed gate on the bottom of the fixed gate and are respectively arranged close to the two sides of the fixed gate; the second sliding groove is arranged in parallel along the short side direction of the top of the movable gate on the top of the movable gate.

[0010] Preferably, the top of the movable gate is further provided with a second chamfer capable of guiding the movable gate to enter into the first guide groove.

[0011] Preferably, the pressure applying unit is provided with a pressure applying rod capable of axially applying pressure to the movable gate, a first driving rod capable of driving the pressure applying rod to move, and a guide portion capable of guiding the first driving rod to axially move.

[0012] Preferably, the first driving unit is provided with a second driving rod and a driving member capable of driving the second driving rod to rotate; the second driving rod is vertically and rotationally arranged in the valve body; and the driving member is coaxially and fixedly arranged on the top of the second driving rod.

[0013] The beneficial effects of the present application compared with the prior art are: the axial compensation of the movable gate by the pressure applying unit and the close fit of the sealing ring realize the secondary pressure sealing after the preliminary longitudinal sealing, and the problem of direct friction and wear of the traditional rigid sealing is avoided, and the risk of leakage is significantly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a perspective view of a knife gate valve body with axial sealing compensation function Figure 1 .

[0015] Figure 2 is a front view of a knife gate valve body with axial sealing compensation function.

[0016] Figure 3 is Figure 2 the A-A cross-sectional view of the A-A cross-sectional view.

[0017] Figure 4 is Figure 3 a local enlarged view of B in FIG.

[0018] Figure 5 is Figure 3 a local enlarged view of C in FIG.

[0019] Figure 6 is Figure 3 a local enlarged view of D in FIG.

[0020] Figure 7 is an exploded perspective view of a knife gate valve body with axial sealing compensation function.

[0021] Figure 8 is a partial structure exploded perspective view of a knife gate valve body with axial sealing compensation function.

[0022] Figure 9 is a perspective view of a knife gate valve body with axial sealing compensation function. Figure 2 .

[0023] Figure 10 is an exploded side view of a knife gate valve body with axial sealing compensation function.

[0024] Reference numerals in the drawings are: 1, valve body; 11, through cavity; 12, sliding groove; 121, first guide groove; 122, second guide groove; 123, first chamfer; 13, sealing ring; 2, sealing module; 21, fixed gate plate; 211, sliding block; 22, movable gate plate; 221, second chamfer; 222, second sliding groove; 23, second driving unit; 231, fixing frame; 232, limiting driving seat; 233, screw rod; 234, driving ring; 3, control module; 31, pressure applying unit; 311, pressure applying rod; 312, first driving rod; 313, guide part; 314, mounting frame; 32, first driving unit; 321, second driving rod; 322, driving piece. DETAILED DESCRIPTION

[0025] In order to further understand the features, technical means and specific purposes and functions achieved by the present application, the present application will be described in further detail below in conjunction with the drawings and specific embodiments.

[0026] Referring to Figures 1 to 10The utility model discloses a knife gate valve body with axial sealing compensation function, which comprises a valve body 1, a through cavity 11 for medium passing through is arranged in the valve body 1, and a first sliding groove 12 is arranged in the inner wall of the valve body 1 and communicated with the through cavity 11 and close to the top of the valve body 1; a sealing module 2 is slidably arranged in the accommodating groove of the valve body 1, and the sealing module 2 is used for blocking the through cavity 11; the sealing module 2 is provided with a fixed gate plate 21 and a movable gate plate 22 which are slidably connected with each other; a control module 3 is vertically arranged on the valve body 1 and close to the side of the valve body 1; the control module 3 is provided with a pressing unit 31 which can drive the movable gate plate 22 blocking the through cavity 11 to move axially along the through cavity 11 and a first driving unit 32 which can drive the pressing unit 31 to perform the pressing operation.

[0027] When the through cavity 11 needs to be sealed, the control module 3 first drives the sealing module 2 to act, so that the fixed gate plate 21 and the movable gate plate 22 move synchronously along the preset motion track under the guidance of the first sliding groove 12, thereby realizing the preliminary sealing of the through cavity 11. The fixed gate plate 21 mainly provides a reference sealing surface in this process, and the movable gate plate 22 completes the sealing cooperation with the fixed gate plate 21 under the guidance of the fixed gate plate 21, thereby forming the first sealing barrier of the through cavity 11.

[0028] After the preliminary sealing is completed, in order to further improve the reliability and durability of the sealing, the control module 3 continues to drive the first driving unit 32 to act, so that the pressing unit 31 is started and generates the pressing force axially along the movable gate plate 22. The pressing force acts on the movable gate plate 22, so that the movable gate plate 22 generates the axial microshift and tightly abuts against the side wall of the first sliding groove 12. In this way, the movable gate plate 22 can form the flexible secondary sealing structure again on the basis of the reference sealing completed by the fixed gate plate 21. Different from the way that the traditional knife gate valve directly presses the valve plate by relying on the rigid sealing surface, the sealing process divides the gate plate into the fixed gate plate 21 and the movable gate plate 22, and the movable gate plate 22 is driven to move axially by the pressing unit 31 after the preliminary sealing is completed, so that the movable gate plate 22 tightly abuts against the sealing ring 13, thereby avoiding the problems of sealing surface wear and sealing failure caused by long-term rigid friction.

[0029] By setting the split structure of the fixed gate plate 21 and the movable gate plate 22, and using the pressing unit 31 to realize the axial compression of the movable gate plate 22 after the preliminary sealing is completed, the movable gate plate 22 and the sealing ring 13 form a flexible secondary sealing. Compared with the traditional rigid sealing mode of the knife gate valve, this scheme significantly reduces the direct friction between the sealing pairs, avoids the rapid wear of the sealing surface, thereby prolonging the service life of the sealing element. At the same time, the secondary sealing can effectively compensate for the sealing gap caused by the fluctuation of the medium pressure or the inclusion of solid particles, significantly improving the sealing reliability and stability of the knife gate valve in high solid content and abrasive medium working conditions. Finally, the sealing effect of low wear, high reliability and long service life is realized.

[0030] Referring to Figure 5 and Figure 10 , the valve body 1 further comprises a sealing ring 13 which is detachably arranged on the inner wall of the first sliding groove 12 and coaxially arranged with the through cavity 11.

[0031] The sealing ring 13 is designed in a replaceable structure, which is fixed on the inner wall of the first sliding groove 12 by thread connection, clamping slot fitting or bolt compression, so that it can be quickly replaced and maintained without disassembling the entire valve body 1.

[0032] During the opening and closing of the valve, after the fixed gate plate 21 and the movable gate plate 22 complete the sealing closure of the through cavity 11, the movable gate plate 22 is driven by the pressing unit 31 to produce a slight movement along the axial direction, so as to form a close abutment with the inner wall of the sealing ring 13, thereby realizing the secondary sealing of the through cavity 11. Since the sealing ring 13 is coaxially arranged with the through cavity 11, it can ensure that the movable gate plate 22 is uniformly stressed during compression, avoiding deflection or local stress concentration, and improving the stability of the sealing effect.

[0033] Referring to Figure 9 and Figure 10 , the sealing module 2 further comprises a second driving unit 23 capable of driving the fixed gate plate 21 and the movable gate plate 22 to slide longitudinally in the first sliding groove 12; the second driving unit 23 is vertically and centrally fixed on the top of the valve body 1, and the driving end is fixedly connected with the fixed gate plate 21.

[0034] The second driving unit 23 is fixedly installed on the top of the valve body 1, and the driving end is fixedly connected with the fixed gate plate 21. The second driving unit 23 can apply uniform driving force to the fixed gate plate 21 along the central axis of the valve body 1, thereby driving the fixed gate plate 21 to move longitudinally in the first sliding groove 12, and driving the movable gate plate 22 to slide synchronously under the guidance of the first sliding groove 12, finally realizing the plugging effect of the through cavity 11. Not only can it ensure the stability and centration of the fixed gate plate 21 and the movable gate plate 22 during movement, but also can effectively avoid the problems of gate plate jamming, uneven friction caused by unbalanced load or deviation.

[0035] The second driving unit 23 comprises a fixing frame 231, a limiting driving seat 232, a screw rod 233 and a driving ring 234; the limiting driving seat 232 is horizontally fixedly arranged on the top of the valve body 1 through the fixing frame 231; the screw rod 233 is vertically screwed into the limiting seat and is fixedly connected with the fixed gate plate 21 at the bottom; the driving ring 234 is coaxially fixedly arranged outside the limiting driving seat 232; when it is needed to drive the fixed gate plate 21 to longitudinally lift, it is only needed to rotate the driving ring 234, the driving ring 234 drives the limiting driving seat 232 to rotate in the rotating state, and finally the purpose of longitudinally driving the screw rod 233 to move is achieved, and the longitudinal driving adjustment of the fixed gate plate 21 is achieved.

[0036] Referring to Figure 4 and Figure 6 , the first sliding groove 12 is composed of a first guide groove 121 and a second guide groove 122 which are longitudinally arranged on the top of the valve body 1, and the second guide groove 122 is larger than the first guide groove 121.

[0037] The first guide groove 121 is used for providing reference guidance for the longitudinal movement of the fixed gate plate 21 and the movable gate plate 22, and ensuring that the two stably slide along the preset path during the opening and closing process, so that the preliminary sealing of the through cavity 11 is realized.

[0038] The groove width of the second guide groove 122 is larger than that of the first guide groove 121, and the purpose is to allow the movable gate plate 22 to produce a slight axial offset under the driving action of the pressing unit 31 after the sealing of the through cavity 11 is completed, so that the movable gate plate 22 can further approach the sealing ring 13 or the inner wall of the first sliding groove 12 and form a close fit. Through this setting, the movable gate plate 22 not only obtains stable guidance during the longitudinal opening and closing process, but also realizes axial compensation displacement after the sealing is completed, thereby effectively improving the tightness and reliability of the sealing.

[0039] The top of the second guide groove 122 is also provided with a first chamfer 123 connected with the first guide groove 121.

[0040] By dividing the first sliding groove 12 into the first guide groove 121 and the second guide groove 122, and making the groove width of the second guide groove 122 larger than that of the first guide groove 121, structural allowance is provided for the axial offset of the movable gate plate 22 while ensuring the stability of the longitudinal opening and closing of the gate plate. Both the sealing surface wear problem caused by the single rigid sealing of the traditional knife gate valve and the flexible compensation sealing through axial offset after the preliminary sealing is completed are avoided, thereby significantly improving the sealing reliability and durability of the valve body 1.

[0041] Referring to Figure 7As shown: the bottom of the fixed gate plate 21 and the top of the movable gate plate 22 are respectively provided with sliding blocks 211 and second sliding grooves 222; the sliding blocks 211 are provided in pairs, and the two sliding blocks 211 are arranged in parallel along the short edge direction of the bottom of the fixed gate plate 21 and are respectively arranged close to the two sides of the fixed gate plate 21; and the second sliding groove 222 is opened in parallel along the short edge direction of the top of the movable gate plate 22 on the top of the movable gate plate 22.

[0042] By arranging the sliding blocks 211 in pairs on the bottom of the fixed gate plate 21 and arranging the second sliding grooves 222 matched therewith on the top of the movable gate plate 22, the stable sliding connection between the fixed gate plate 21 and the movable gate plate 22 is realized. On the one hand, the cooperation of the sliding blocks 211 and the second sliding grooves 222 improves the movement accuracy and stability of the movable gate plate 22 during the longitudinal opening and closing and the axial compensation; on the other hand, the structure of the sliding blocks 211 arranged in pairs can make the force on the movable gate plate 22 more uniform when the movable gate plate 22 is driven to be offset by the pressure applying unit 31, thereby reducing the risk of local wear and tear and improving the reliability and durability of the overall sealing.

[0043] Referring to Figure 4 As shown: the top of the movable gate plate 22 is further provided with a second chamfer 221 capable of guiding the movable gate plate 22 to enter the first guide groove 121 centrally.

[0044] The top of the movable gate plate 22 is further provided with a second chamfer 221, and the setting position of the second chamfer 221 is located on one side of the top edge of the movable gate plate 22 close to the first guide groove 121. The second chamfer 221 is a guide inclined surface in structure, and the angle and size of the inclined surface thereof are optimized and designed so as to cooperate with the first chamfer 123 of the first guide groove 121 when the movable gate plate 22 moves upward, thereby guiding the movable gate plate 22 to enter the first guide groove 121 gradually and centrally.

[0045] Referring to Figure 8 and Figure 10 As shown: the pressure applying unit 31 is provided with a pressure applying rod 311 capable of applying pressure to the movable gate plate 22 in the axial direction, a first driving rod 312 capable of driving the pressure applying rod 311 to move, and a guide portion 313 capable of guiding the first driving rod 312 to move in the axial direction.

[0046] The pressure applying unit 31 further includes a mounting frame 314, and the guide portion 313 is coaxially fixedly arranged in the through cavity 11 through the mounting frame 314, so as to ensure the coaxiality and stability between the guide portion 313 and the valve body 1 and the movable gate plate 22. The pressure applying rod 311 is coaxially and slidingly arranged in the guide portion 313 and can stably reciprocate in the axial direction under the limiting action of the guide portion 313.

[0047] When axial pressure needs to be applied to the movable gate 22 to achieve sealing, the first driving unit 32 is first actuated, which drives the first driving rod 312 to produce axial displacement. The first driving rod 312 can maintain coaxial transmission relationship with the pressing rod 311 under the guidance and limiting action of the guide part 313, thereby synchronously driving the pressing rod 311 to slide downward along the axial direction. With the continuous advancement of the first driving rod 312, the pressing rod 311 gradually contacts and finally tightly abuts against the back of the movable gate 22. Through this abutting action, the movable gate 22 is reliably pushed in the axial direction and achieves a slight axial offset under the guidance of the first sliding groove 12, until it tightly fits with the sealing ring 13 arranged in the first sliding groove 12 of the valve body 1.

[0048] Not only can the secondary axial pressure sealing be achieved after the preliminary longitudinal sealing is completed, but also the uniform and stable force applied by the pressing rod 311 to the movable gate 22 can be ensured, avoiding local wear or loose sealing caused by unbalanced load.

[0049] Referring to Figure 10 The first driving unit 32 is provided with a second driving rod 321 and a driving piece 322 capable of driving the second driving rod 321 to rotate; the second driving rod 321 is vertically rotatably arranged in the valve body 1; and the driving piece 322 is coaxially and fixedly arranged at the top of the second driving rod 321.

[0050] The first driving unit 32 further comprises a driving gear rotatably mounted inside the guide part 313 and connected with the toothed structure of the guide rod in meshing mode, thereby realizing the conversion from torsional motion to linear motion. The bottom of the second driving rod 321 is fixedly connected with the driving gear in coaxial mode, so as to ensure the stability of torque transmission and coaxiality.

[0051] In actual use, when it is necessary to drive the second driving rod 321 to produce sliding displacement along the axial direction of the guide part 313, the driving piece 322 is only needed to be twisted by an external tool, so that the driving piece 322 drives the second driving rod 321 to rotate synchronously. The second driving rod 321 drives the driving gear to rotate in the rotating process through the coaxial fixed connection with the driving gear; the driving gear meshes with the toothed structure of the guide rod in the rotating process, thereby forcing the guide rod to produce precise linear sliding displacement along the axial direction, and finally achieving the purpose of driving the second driving rod 321 to move axially.

[0052] It should be noted that the first driving unit 32 is not limited to the above-mentioned driving structure based on gear-and-rack transmission, but can also adopt other driving mechanisms capable of realizing the reciprocating linear motion of the second driving rod 321. Regardless of the driving mode, the core purpose is to provide stable and controllable axial driving force to realize the reciprocating sliding of the second driving rod 321 in the guide part 313.

[0053] The application can provide efficient sealing, is not easy to produce wear, is simple to operate and has good sealing effect.

[0054] The above embodiments only express one or several embodiments of the application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the application. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the application, several modifications and improvements can be made, which belong to the protection scope of the application. Therefore, the protection scope of the application should be subject to the appended claims.

Claims

1. A knife gate valve body having an axial seal compensation function, characterized by, The utility model relates to a valve body, a through cavity for medium passing through is set up in the valve body, and a first sliding groove is set up in the inner wall of the valve body and communicates with the through cavity and is close to the top of the valve body, a sealing module is slidably arranged in the accommodating groove of the valve body, and the sealing module is used for blocking the through cavity, the sealing module is provided with a fixed shutter and a movable shutter which are slidably connected with each other, a control module is vertically arranged on the valve body and is arranged close to the side of the valve body, the control module is provided with a pressure applying unit which can drive the movable shutter axially along the through cavity and a first driving unit which can drive the pressure applying unit to perform pressure applying operation. The valve body further comprises a sealing ring which is detachably arranged in the inner wall of the first sliding groove and coaxially arranged with the through cavity. The sealing module further comprises a second driving unit which can longitudinally drive the fixed shutter and the movable shutter to longitudinally slide in the first sliding groove. The second driving unit is vertically and centrally fixedly arranged on the top of the valve body, and the driving end is fixedly connected with the fixed shutter.

2. The knife gate valve body with axial seal compensation function according to claim 1, characterized in that, The first sliding groove is composed of a first guide groove and a second guide groove which are longitudinally arranged on the top of the valve body, and the second guide groove is larger than the first guide groove.

3. The knife gate valve body with axial seal compensation function according to claim 1, characterized in that, The bottom of the fixed shutter and the top of the movable shutter are respectively provided with a sliding block and a second sliding groove. The sliding block is provided with two sliding blocks which are parallelly arranged on the bottom of the fixed shutter along the short side direction of the bottom of the fixed shutter and are respectively arranged close to the two sides of the fixed shutter.

4. The knife gate valve body with axial seal compensation function according to claim 1, characterized in that, The second sliding groove is parallelly arranged on the top of the movable shutter along the short side direction of the top of the movable shutter.

5. The knife gate valve body with axial seal compensation function according to claim 1, characterized in that, The top of the movable shutter is further provided with a second chamfer which can guide the movable shutter to enter the first guide groove. The pressure applying unit is provided with a pressure applying rod which can axially apply pressure to the movable shutter, a first driving rod which can drive the pressure applying rod to move, and a guide portion which can guide the first driving rod to axially move. The first driving unit is provided with a second driving rod and a driving member which can drive the second driving rod to rotate.

6. The knife gate valve body with axial seal compensation function according to claim 5, characterized in that, The second driving rod is vertically and rotatably arranged in the valve body.

7. The knife gate valve body with axial seal compensation function according to claim 1, characterized in that, The driving member is coaxially and fixedly arranged on the top of the second driving rod.

8. The knife gate valve body with axial seal compensation function according to claim 1, characterized in that, ​ ​ ​

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