A glue-filling stable sealing gate valve

Abstract

The utility model relates to the technical field of knife gate valve, concretely to a kind of glue filling stable sealing knife gate valve, including valve body, the bottom of valve body is equipped with valve seat, the inner wall and bottom end outer wall of valve seat are respectively provided with U-shaped sealing groove and injection hole, the inner wall screw thread connection of valve body top end has lead screw, the bottom fixed mounting of lead screw has valve knife, the outer wall screw thread connection of lead screw top end has hand wheel, the inner wall of valve seat is provided with sealing device, the sealing device includes slot, the both sides of U-shaped sealing groove inner wall are provided with slot, the inner wall sliding installation of slot has bolt, the utility model is fixed in the U-shaped sealing groove of valve seat by "the cooperation of bolt and slot U-shaped rubber ring", through the pre-positioning of U-shaped rubber ring, ensure injection port and valve seat injection hole accurate alignment, provide stable foundation for subsequent resin pouring, avoid the deviation of glue filling caused by sealing element displacement in traditional assembly.

Description

Technical Field

[0001] This utility model relates to the field of knife gate valve technology, specifically to a glue-filled, stabilized, and sealed knife gate valve. Background Technology

[0002] Knife gate valves, used to cut off or regulate the flow of media (such as liquids, powders, slurries, etc.), are widely used in chemical, water treatment, metallurgical, and building materials industries due to their compact structure and fast opening and closing speed. In actual working conditions, the sealing performance and operational stability of the valve directly determine production efficiency and safety, and the valve body, as the core load-bearing component of the knife gate valve, has a particularly critical impact on sealing and operational performance due to its machining precision and structural design.

[0003] However, in current integrally cast knife gate valves, the sealing installation area is not machined. However, due to the small size of the area where the sealing strip is installed, the dimensions of the casting are less stable. Furthermore, the recessed shape of the installation area makes it difficult for the mold to remove the casting, resulting in high surface roughness. Finally, casting itself is a special process and is subject to casting errors. All these factors combined lead to significant deviations, making it impossible to guarantee stable sealing and torque. Therefore, we propose a glue-filled, stabilized sealing knife gate valve. Utility Model Content

[0004] The purpose of this invention is to solve the problem of poor sealing caused by casting instability, and to provide a glue-filled stable sealing knife gate valve.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A glue-filled, stabilized sealing gate valve includes a valve body, a valve seat mounted at the bottom of the valve body, a U-shaped sealing groove and an injection hole respectively formed on the inner wall and the outer wall at the bottom end of the valve seat, a lead screw threadedly connected to the inner wall at the top end of the valve body, a valve knife fixedly mounted at the bottom of the lead screw, a handwheel threadedly connected to the outer wall at the top end of the lead screw, a sealing device provided on the inner wall of the valve seat, the sealing device including a slot, the slot being formed on both sides of the inner wall of the U-shaped sealing groove, a pin slidably mounted on the inner wall of the slot, a U-shaped rubber ring fixedly mounted on the opposite side of the pin, an injection port formed on the bottom side wall of the U-shaped rubber ring, an injection cavity formed inside the U-shaped rubber ring, an L-shaped groove formed at the edge of the injection port, a rubber plug slidably mounted on the inner wall of the injection port, and an L-shaped locking block fixedly mounted on the bottom surface of the rubber plug near the edge of the injection port.

[0007] Preferably, a rigid plate is provided at the connection between the pin and the U-shaped rubber ring, the pin is T-shaped, and the pin is located on the movement trajectory of the slot.

[0008] Preferably, there are several L-shaped card blocks, the size of the inlet of the L-shaped card slot is equal to the size of the insertion end of the L-shaped card block, and the several L-shaped card blocks are on the engagement trajectory with the L-shaped card slot.

[0009] Preferably, the injection chamber is a U-shaped hollow structure adapted to the U-shaped rubber ring, and the volume of the injection chamber matches the pressure value of the valve knife under operating conditions; the outer diameter of the injection port is clearance-fitted with the inner diameter of the preset injection hole of the valve seat, and the injection port is connected to an external booster pump.

[0010] Preferably, the outer wall of the rubber stopper is circumferentially fitted with an annular sealing gasket, and the injection hole of the valve seat is provided with an outwardly protruding sealing flange near the outer wall end face of the rubber stopper to prevent displacement of the rubber stopper.

[0011] Preferably, the outer wall of the U-shaped rubber ring near the valve knife is provided with several evenly distributed wear-resistant ridges, and the contact surface between the U-shaped rubber ring and the U-shaped sealing groove of the valve seat is coated with an anti-slip sealing coating; the hard plate is made of hard rubber material, the thickness of the hard plate is 2-5mm, and its outline is adapted to the end outline of the U-shaped rubber ring.

[0012] By employing the above technical solution, this utility model provides a glue-filled, stabilized sealing knife gate valve. It possesses at least the following beneficial effects:

[0013] 1. This utility model uses the basic structure of "fixing the U-shaped rubber ring to the U-shaped sealing groove of the valve seat by the cooperation of the pin and the slot" to ensure that the injection port and the injection hole of the valve seat are accurately aligned through the pre-installation and positioning of the U-shaped rubber ring, providing a stable foundation for subsequent resin injection and avoiding the glue injection deviation caused by the displacement of the sealing component in traditional assembly.

[0014] 2. This utility model uses an L-shaped snap-fit ​​fixing method to ensure that the rubber plug is tightly fitted into the inner wall of the injection port and the injection hole of the valve seat. This effectively prevents leakage problems after molten resin is poured in and during the cooling and shaping process, and ensures that the pressure in the injection cavity is always consistent with the operating pressure when the valve knife is closed. This accurately compensates for the size deviation and surface roughness defects of the U-shaped sealing groove caused by valve body casting. It also avoids the risk of sealing failure caused by loosening of the rubber plug or displacement of the U-shaped rubber ring during long-term use. This further enhances the fit stability of the valve knife and the U-shaped rubber ring, reduces the fluctuation of operating torque, and improves the assembly reliability and service life of the overall sealing system. It effectively solves the core problems of unstable sealing and large torque fluctuation caused by unreliable fixing of sealing components in traditional cast knife gate valves. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of the present invention, form part of this application:

[0016] Figure 1This is a side sectional view of the overall structure of this utility model;

[0017] Figure 2 This is a front sectional view of the valve seat structure of this utility model;

[0018] Figure 3 This is a cross-sectional schematic diagram of the U-shaped rubber ring in this embodiment;

[0019] Figure 4 This is a schematic diagram of the rubber stopper in this embodiment.

[0020] In the diagram: 1. Valve body; 2. Valve seat; 201. U-shaped sealing groove; 3. Screw; 4. Valve knife; 5. Handwheel; 6. Sealing device; 61. Slot; 62. Pin; 63. U-shaped rubber ring; 64. Injection port; 65. Injection chamber; 66. L-shaped groove; 67. Rubber plug; 68. L-shaped block. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example 1

[0023] A glue-potted stabilized sealing knife gate valve, such as Figures 1-4 As shown, the valve includes a valve body 1, a valve seat 2 installed at the bottom of the valve body 1, a U-shaped sealing groove 201 and an injection hole respectively opened on the inner wall and the outer wall at the bottom end of the valve seat 2, a lead screw 3 threadedly connected to the inner wall at the top end of the valve body 1, a valve knife 4 fixedly installed at the bottom of the lead screw 3, a handwheel 5 threadedly connected to the outer wall at the top end of the lead screw 3, a sealing device 6 provided on the inner wall of the valve seat 2, the sealing device 6 includes a slot 61, the slot 61 is opened on both sides of the inner wall of the U-shaped sealing groove 201, a pin 62 is slidably installed on the inner wall of the slot 61, a U-shaped rubber ring 63 is fixedly installed on the opposite side of the pin 62, an injection port 64 is opened on the bottom side wall of the U-shaped rubber ring 63, an injection cavity 65 is opened inside the U-shaped rubber ring 63, an L-shaped groove 66 is opened at the edge of the injection port 64, a rubber plug 67 is slidably installed on the inner wall of the injection port 64, and an L-shaped block 68 is fixedly installed on the bottom surface of the rubber plug 67 near the edge of the injection port 64.

[0024] A rigid plate is provided at the connection between the pin 62 and the U-shaped rubber ring 63. The pin 62 is T-shaped and is located on the movement path of the slot 61.

[0025] There are several L-shaped card blocks 68, and the size of the inlet of the L-shaped card slot 66 is equal to the size of the insertion end of the L-shaped card block 68. The several L-shaped card blocks 68 are on the engagement track of the L-shaped card slot 66.

[0026] The injection chamber 65 is a U-shaped hollow structure adapted to the U-shaped rubber ring 63, and the volume of the injection chamber 65 matches the pressure value of the valve knife 4 under operating conditions; the outer diameter of the injection port 64 is clearance-fitted with the inner diameter of the injection hole preset in the valve seat 2, and the injection port 64 is connected to an external booster pump.

[0027] The outer wall of the rubber plug 67 is circumferentially fitted with an annular sealing gasket, and the injection hole of the valve seat 2 is provided with an outwardly protruding sealing flange near the outer wall end face of the rubber plug 67 to prevent the rubber plug 67 from shifting.

[0028] The outer wall of the U-shaped rubber ring 63 near the valve knife 4 is provided with several evenly distributed wear-resistant ridges, and the contact surface between the U-shaped rubber ring 63 and the U-shaped sealing groove 201 of the valve seat 2 is coated with an anti-slip sealing coating; the hard plate is made of hard rubber, the thickness of the hard plate is 2-5mm, and its outline is adapted to the end outline of the U-shaped rubber ring 63.

[0029] During installation, the U-shaped rubber ring 63 is inserted into the slot 61 to fix it to the U-shaped sealing groove 201 of the valve seat 2. The injection port 64 of the U-shaped rubber ring 63 is passed through the injection hole of the valve seat 2. Then, the valve knife 4 is turned with the handwheel 5 to lower the screw 3 to the closed position. Finally, the external booster pump is connected to the injection port 64 to inject resin into the injection chamber 65 of the U-shaped rubber ring 63, so that the internal pressure is consistent with the operating pressure when the valve knife 4 is closed. The booster pump is then removed.

[0030] Align the L-shaped locking block 68 with the insertion end of the L-shaped slot 66 on the rubber plug 67, insert the rubber plug 67 into the inner wall of the injection hole of the valve seat 2 and the injection port 64 of the U-shaped rubber ring 63, rotate the rubber plug 67 clockwise, and after the bottom end of the L-shaped locking block 68 is inserted along the inner wall of the L-shaped slot 66, the fixing of the rubber plug 67, the valve seat 2 and the U-shaped rubber ring 63 is completed.

[0031] This utility model utilizes a basic structure where "the pin 62 and slot 61 cooperate to fix the U-shaped rubber ring 63 to the U-shaped sealing groove 201 of the valve seat 2," combined with the newly added design of "the L-shaped locking block 68 and L-shaped locking groove 66 adapting to fix the rubber plug 67, valve seat 2, and U-shaped rubber ring 63." On one hand, the pre-installation and positioning of the U-shaped rubber ring 63 ensures precise alignment between the injection port 64 and the injection hole of the valve seat 2, providing a stable foundation for subsequent resin injection and avoiding injection deviations caused by seal displacement in traditional assembly. On the other hand, the L-shaped locking mechanism allows the rubber plug 67 to fit tightly into the inner wall of the injection port 64 and the injection hole of the valve seat 2, effectively... To prevent leakage during molten resin injection and cooling and setting, and to ensure that the pressure in the injection chamber 65 remains consistent with the operating pressure when the valve 4 is closed, this precisely compensates for the dimensional deviation and surface roughness defects of the U-shaped sealing groove 201 caused by the casting of the valve body 1. It also avoids the risk of sealing failure caused by the loosening of the rubber plug 67 or the displacement of the U-shaped rubber ring 63 during long-term use, further enhances the fit stability between the valve 4 and the U-shaped rubber ring 63, reduces operating torque fluctuations, improves the assembly reliability and service life of the overall sealing system, and effectively solves the core problems of unstable sealing and large torque fluctuations caused by unreliable fixing of sealing components in traditional cast knife gate valves.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A glue-filled stabilizing sealing knife gate valve, comprising a valve body (1), a valve seat (2) installed at the bottom of the valve body (1), a U-shaped sealing groove (201) and an injection hole respectively opened on the inner wall and the outer wall at the bottom end of the valve seat (2), a screw rod (3) threadedly connected to the inner wall at the top end of the valve body (1), a valve knife (4) fixedly installed at the bottom of the screw rod (3), and a handwheel (5) threadedly connected to the outer wall at the top end of the screw rod (3), characterized in that: The valve seat (2) has a sealing device (6) on its inner wall. The sealing device (6) includes a slot (61). The slot (61) is located on both sides of the inner wall of the U-shaped sealing groove (201). A pin (62) is slidably installed on the inner wall of the slot (61). A U-shaped rubber ring (63) is fixedly installed on the opposite side of the pin (62). An injection port (64) is opened on the bottom side wall of the U-shaped rubber ring (63). An injection cavity (65) is opened inside the U-shaped rubber ring (63). An L-shaped groove (66) is opened at the edge of the injection port (64). A rubber plug (67) is slidably installed on the inner wall of the injection port (64). An L-shaped block (68) is fixedly installed on the bottom surface of the rubber plug (67) near the edge of the injection port (64).

2. The glue-filled stabilized sealing knife gate valve according to claim 1, characterized in that: A rigid plate is provided at the connection between the pin (62) and the U-shaped rubber ring (63). The pin (62) is T-shaped and is located on the movement trajectory of the slot (61).

3. The potting-stabilized sealing knife gate valve according to claim 1, characterized in that: The number of L-shaped card blocks (68) is several, the size of the inlet of the L-shaped card slot (66) is equal to the size of the insertion end of the L-shaped card block (68), and the several L-shaped card blocks (68) are on the engagement trajectory of the L-shaped card slot (66).

4. The glue-filled stabilized sealing knife gate valve according to claim 1, characterized in that: The injection chamber (65) is a U-shaped hollow structure adapted to the U-shaped rubber ring (63), and the volume of the injection chamber (65) matches the pressure value of the valve knife (4) under operating conditions; the outer diameter of the injection port (64) is clearance-fitted with the inner diameter of the injection hole preset in the valve seat (2), and the injection port (64) is connected to an external booster pump.

5. The glue-filled stabilized sealing knife gate valve according to claim 1, characterized in that: The outer wall of the rubber plug (67) is circumferentially fitted with an annular sealing gasket, and the injection hole of the valve seat (2) is provided with an outwardly protruding sealing flange near the outer wall end face of the rubber plug (67) to prevent the rubber plug (67) from shifting.

6. The potting-stabilized sealing knife gate valve according to claim 2, characterized in that: The outer wall of the U-shaped rubber ring (63) near the valve knife (4) is provided with several uniformly distributed wear-resistant ridges, and the contact surface between the U-shaped rubber ring (63) and the U-shaped sealing groove (201) of the valve seat (2) is coated with an anti-slip sealing coating; the hard plate is made of hard rubber, the thickness of the hard plate is 2-5mm, and its outline is adapted to the end outline of the U-shaped rubber ring (63).

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