Valve body casting facilitating sand cleaning

Abstract

A valve body casting convenient to clean sand, including valve body, the valve body has an internal flow passage inside, for medium flow, the internal flow passage has a flow passage input port and a flow passage output port, secondly, a hollow cylindrical temporary storage room extending downward is integrally formed in the valve body near the lower side of the flow passage input port, the upper end of the temporary storage room is provided with a through hole, and the through hole is communicated with the bottom of the internal flow passage. Since the temporary storage room is arranged below the flow passage inlet where impurities are most likely to deposit, the impurities are isolated from the main flow area, direct erosion and wear of the impurities on the key moving sealing pairs such as valve clack and valve seat are effectively avoided, the service life of the valve is significantly prolonged, meanwhile, by operating the sealing plug and the bottom cleaning port, the impurities collected in the temporary storage room can be safely discharged without stopping operation and disassembly of the valve, and the maintenance difficulty, time and cost are greatly reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of valve body castings, specifically to a valve body casting that is easy to clean. Background Technology

[0002] As a key control component in fluid transport systems, the valve's core component is the valve body, which is typically manufactured using casting to achieve complex internal flow channels and the required structural strength. For valve bodies with curved or "S"-shaped flow channels, such as gate valves and angle valves, when transporting media containing solid impurities like sand and welding slag, these impurities easily accumulate in "dead corners" such as the inner bends and inlets of the flow channel. This not only exacerbates wear on the sealing surfaces, leading to internal leakage, but may also hinder valve disc movement and affect valve performance.

[0003] Existing valve improvements primarily focus on sealing and strength. For example, Chinese utility model patent with authorization announcement number "CN220204806U" discloses a special-shaped gate valve body casting, which improves sealing performance by adding multiple sealing structures; however, this patent and similar technologies have not solved the fundamental problem of impurity deposition and cleaning. Once deposition occurs, cleaning is extremely difficult, often requiring the disassembly of the entire valve, resulting in high maintenance costs.

[0004] Furthermore, from the perspective of casting process, valve bodies with complex internal cavities also present challenges in the "sand removal" (removal of core sand) process after casting. Traditional methods are insufficient to completely remove residual sand particles deep within the curved flow channels. These residual sand particles can become new sources of wear during valve use. Therefore, an innovative valve body casting design is urgently needed that can proactively manage impurities structurally while also balancing the convenience of casting sand removal and online maintenance. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a valve body casting that facilitates sand removal. This valve body casting actively collects and isolates impurities by setting an isolable temporary storage chamber below the easily deposited area, enabling online, non-disassembly cleaning. Furthermore, its structure itself is beneficial for post-casting sand removal operations.

[0006] The technical solution adopted to solve the above technical problems is:

[0007] A valve body casting for easy sand removal includes a valve body with an internal flow channel. The valve body has a hollow temporary storage chamber extending downwards, integrally cast below the flow channel inlet. The upper end of the temporary storage chamber communicates with the interior of the flow channel through a through hole. A closable sealing plug is provided at the through hole. The bottom of the temporary storage chamber is provided with an openable and closable cleaning port.

[0008] Furthermore, the inner wall of the through hole has a tapered hole structure that is larger at the top and smaller at the bottom, which facilitates the falling of impurities into the temporary storage chamber by the fluid or by their own weight.

[0009] Furthermore, the sealing plug is controlled by a drive mechanism to move up and down to open and close the through hole; the drive mechanism includes a screw threadedly connected to the sealing plug, the end of which extends to the outside of the valve body for easy operation.

[0010] Furthermore, it also includes a limiting component, which is used to limit the rotation of the sealing plug around its axis to ensure that it only makes linear motion under the drive of the screw; the limiting component includes a guide portion disposed on the inner wall of the temporary storage chamber, and a mating portion disposed on the outer wall of the sealing plug and slidingly engaging with the guide portion.

[0011] Furthermore, the outer wall of the sealing plug is provided with at least one annular sealing ring, which slides and seals with the inner wall of the temporary storage chamber to prevent the medium from leaking from the upper part of the temporary storage chamber.

[0012] Furthermore, the sealing plug and the screw share an input channel; the upper end of the input channel is connected to the top of the sealing plug with a high-pressure nozzle, and the lower end is connected to the side wall or end of the screw with a manual valve that can be connected to an external pipeline. By connecting a high-pressure water or air source to this manual valve, the inside of the valve body can be backflushed.

[0013] Furthermore, the high-pressure nozzle is a multi-angle fan-shaped nozzle or a rotating nozzle, with its spray direction facing the internal flow channel of the valve body, resulting in a wider rinsing range.

[0014] Furthermore, the cleaning port is internally threaded with a sealing bolt; the bottom inner wall of the temporary storage chamber is a guide slope that is smoothly inclined toward the cleaning port, which facilitates the complete discharge of impurities.

[0015] Furthermore, the inner walls of the temporary storage chamber are all smooth curved surfaces, and all connections are smoothly transitioned without sharp corners or pits. This design is not only conducive to the flow of media and the discharge of impurities, but also facilitates the shedding and cleaning of molding sand during casting. The bottom outer wall of the temporary storage chamber is equipped with a matching moisture-proof shell, which can be connected by snap-fit ​​or magnetic attraction to improve the service life of external parts.

[0016] The beneficial effects of this utility model are as follows:

[0017] 1. This utility model isolates impurities from the main flow area by setting a temporary storage chamber below the inlet of the flow channel where impurities are most likely to accumulate. This effectively avoids the direct scouring and wear of impurities on key moving sealing surfaces such as valve discs and valve seats, significantly extending the service life of the valve. At the same time, by operating the sealing plug and bottom cleaning port, the impurities collected in the temporary storage chamber can be safely discharged without stopping the valve or disassembling it, greatly reducing maintenance difficulty, time and cost.

[0018] 2. This utility model allows for powerful reverse flushing through a built-in high-pressure flushing channel, which can remove stubborn impurities and further enhance the self-cleaning ability and maintenance flexibility of the valve body. Secondly, the temporary storage chamber and valve body cavity are designed with smooth transitions and no dead corners, making it easier for the core sand to be removed by vibration, airflow or water gun during the casting production stage. This improves the sand removal efficiency of castings and the quality of finished products, reduces residual sand particles from the source, and does not significantly increase the overall size of the valve, making it highly practical. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the external main structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the main cross-sectional structure of the present utility model;

[0021] Figure 3 for Figure 2 A structural diagram of the intermediate temporary storage room under cleanup conditions;

[0022] Figure 4 for Figure 2 A schematic diagram of the structure of the intermediate temporary storage room under normal conditions.

[0023] In the diagram: 1. Valve body; 101. Internal flow channel; 102. Flow channel inlet; 2. Temporary storage chamber; 201. Through hole; 202. Cleaning port; 203. Guide part; 3. Sealing plug; 301. Fitting part (keyway); 302. Annular sealing ring; 4. Screw; 5. Input channel; 501. High-pressure nozzle; 502. Manual valve; 6. Sealing bolt. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0027] In the above description of this utility model, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0028] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0029] Example 1

[0030] exist Figures 1-4 In this invention, a technical solution is provided: a valve body casting that facilitates sand removal, particularly suitable for angle gate valves. The casting includes a valve body 1, which has an internal flow channel 101 for media flow. The internal flow channel 101 has a flow channel inlet 102 and a flow channel outlet. Furthermore, near the flow channel inlet 102, a hollow cylindrical temporary storage chamber 2 extending downward is integrally cast with the valve body 1. A through hole 201 is provided at the upper end of the temporary storage chamber 2, which communicates with the bottom of the internal flow channel 101. The inner wall of the through hole 201 is machined into a tapered hole structure that is larger at the top and smaller at the bottom, forming a funnel shape, which facilitates impurities to fall smoothly into the temporary storage chamber 2 below under the influence of gravity or fluid.

[0031] Secondly, a sealing plug 3 that can move up and down to open and close the through hole 201 is provided. The top shape of the sealing plug 3 matches the conical through hole 201 to ensure the sealing effect. The sealing plug 3 is controlled to rise and fall by a set of drive mechanisms. Specifically, the drive mechanism includes a screw 4. The lower end of the screw 4 passes through the top of the temporary storage chamber 2 and extends into its interior, and is threadedly connected to the internal threaded hole (i.e., adjustment groove) at the bottom of the sealing plug 3. The upper end of the screw 4 extends to the outside of the valve body 1 and can be equipped with a handwheel or motor (not shown in the figure) for easy operation. When the screw 4 is rotated clockwise or counterclockwise, the sealing plug 3 can be driven to rise or fall in the vertical direction, thereby realizing the opening and closing of the through hole 201.

[0032] To prevent the sealing plug 3 from rotating under the rotational drive of the screw 4 (which would prevent it from achieving linear lifting and lowering), this invention includes a limiting component, such as... Figure 2 and Figure 3 As shown, the limiting component includes an axial guide portion 203 (e.g., two symmetrical axially protruding guide keys) provided on the inner wall of the temporary storage chamber 2, and a corresponding mating portion 301 (e.g., a keyway that slides with the guide keys) provided on the outer wall of the sealing plug 3. Through the mating of the guide keys and the keyway, the rotational freedom of the sealing plug 3 about its own axis is restricted, so that it can only make strict up-and-down linear movements under the drive of the screw 4.

[0033] Meanwhile, to ensure the sealing of the temporary storage chamber 2 when collecting impurities and to prevent the medium from leaking from the gap between the sealing plug 3 and the inner wall of the temporary storage chamber 2, one or more annular sealing grooves are provided on the outer wall of the sealing plug 3. An annular sealing ring 302 (such as an O-ring) is installed in the groove, and the annular sealing ring 302 forms a sliding sealing fit with the smooth inner wall of the temporary storage chamber 2.

[0034] At least one cleaning port 202 is provided at the center of the bottom of the temporary storage chamber 2. A sealing bolt 6 is internally threaded into the cleaning port 202. In order to facilitate the complete discharge of impurities collected in the temporary storage chamber 2, the bottom inner wall of the temporary storage chamber 2 is designed as a guide slope that is smoothly inclined towards the center of the cleaning port 202. At the same time, all inner walls of the temporary storage chamber 2 and their connections with the through hole 201 and the cleaning port 202 are made of smooth curved surfaces with no sharp corners or pits. This design not only facilitates the flow and discharge of impurities, but also greatly facilitates the cleaning of the core sand of the temporary storage chamber 2 after casting.

[0035] Working principle and online cleaning process: During normal operation, when the valve is installed in the pipeline and working normally, the sealing plug 3 is in the raised state (e.g., Figure 4As shown), the through hole 201 is open. When a medium containing impurities such as sand enters the valve body 1 from the flow channel inlet 102, heavier impurities, as they flow above the through hole 201, will fall through the conical through hole 201 under the action of gravity and fluid and be stored in the lower temporary storage chamber 2. This isolates them from the main flow area, valve disc, valve seat, and other key components in the valve body, preventing wear. When online isolation and cleaning are required, and when it is necessary to clean the deposited impurities, first rotate the screw 4 externally to drive the sealing plug 3 downward until its top tightly seals and blocks the conical through hole 201 (as shown). Figure 3 As shown), this operation completely isolates the temporary storage chamber 2 from the main cavity of the valve body and the external pressure pipeline. Then, use a tool to unscrew the sealing bolt 6 at the bottom of the temporary storage chamber 2. At this time, the impurities collected inside the temporary storage chamber 2 are completely discharged from the cleaning port 202 along the guide slope 204 under the pressure of the residual medium or its own weight. After cleaning, tighten the sealing bolt 6 again, and then rotate the screw 4 in the opposite direction to lift the sealing plug 3. The valve can then resume flow. The whole process does not require stopping the machine or disassembling the valve.

[0036] Meanwhile, during the post-processing stage of the valve body casting blank, because the temporary storage chamber 2 has a simple structure, smooth inner wall without dead corners, and two openings, through hole 201 and cleaning port 202, sand cleaning equipment (such as vibrator, shot blasting or high pressure water gun) can very efficiently remove the core sand remaining in the casting from the chamber.

[0037] Example 2: Based on Example 1, in order to further enhance the self-cleaning ability of the valve body, this example adds an integrated high-pressure flushing function.

[0038] refer to Figure 3 and Figure 4 The screw 4 is designed as a hollow structure, and the sealing plug 3 also has a channel machined inside. After the two are connected, they together form a through input channel 5. A corrosion-resistant high-pressure nozzle 501 is installed at the top center of the sealing plug 3 at the upper end of the input channel 5. The high-pressure nozzle 501 is a fan-shaped nozzle or a rotatable nozzle that can spray at multiple angles. Its spray direction is mainly towards the internal flow channel 101 of the valve body 1, the valve seat and other areas that are prone to accumulation. A manual valve 502 is connected to the side wall (or end) of the screw 4 at the lower end of the input channel 5. The interface of the manual valve 502 can be connected to the external high-pressure water pump or air compressor pipeline.

[0039] Enhanced Function Principle: When stubborn impurities adhere to the inner wall of the valve's internal flow channel 101 or the temporary storage chamber 2, deep flushing can be performed with the valve closed. During operation, connect an external high-pressure water or air source to the manual valve 502, open the manual valve 502, and the high-pressure fluid is ejected at high speed from the high-pressure nozzle 501 on top of the sealing plug 3 through the input channel 5. Due to the special design of the nozzle 501, the high-pressure jet can cover and flush the complex area of ​​the valve body's internal flow channel 101 and the inner wall of the temporary storage chamber 2, achieving powerful reverse cleaning. This function can be used as a remedial measure for regular maintenance or performance degradation without disassembling the valve.

[0040] In addition, to further protect the external structure of the temporary storage chamber 2, especially the bottom area, from external environmental corrosion or impact, a matching moisture-proof shell 7 can be installed on the bottom outer wall of the temporary storage chamber 2 by means of ribs, clips or bolts to protect the bolts.

[0041] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A valve body casting for easy sand removal, comprising a valve body (1) having an internal flow channel (101), characterized in that: The valve body (1) has a hollow temporary storage chamber (2) extending downwards, integrally cast below the flow channel inlet (102). The upper end of the temporary storage chamber (2) is connected to the interior of the flow channel (101) through a through hole (201). A closable sealing plug (3) is provided at the through hole (201). A closable cleaning port (202) is provided at the bottom of the temporary storage chamber (2).

2. A valve body casting for easy sand removal according to claim 1, characterized in that: The inner wall of the through hole (201) is a tapered hole structure that is larger at the top and smaller at the bottom.

3. A valve body casting for easy sand removal according to claim 1, characterized in that: The sealing plug (3) is controlled to move up and down by a driving mechanism to open and close the through hole (201); the driving mechanism includes a screw (4) threadedly connected to the sealing plug (3), and the end of the screw (4) extends to the outside of the valve body (1).

4. A valve body casting for easy sand removal according to claim 3, characterized in that: It also includes a limiting component for limiting the rotation of the sealing plug (3) around its axis; the limiting component includes a guide portion (203) disposed on the inner wall of the temporary storage chamber (2) and a mating portion (301) disposed on the outer wall of the sealing plug (3) and slidingly engaging with the guide portion (203).

5. A valve body casting for easy sand removal according to claim 3 or 4, characterized in that: The outer wall of the sealing plug (3) is provided with at least one annular sealing ring (302), and the annular sealing ring (302) slides and seals with the inner wall of the temporary storage chamber (2).

6. A valve body casting for easy sand removal according to claim 3, characterized in that: The sealing plug (3) and the screw (4) are provided with an input channel (5); the upper end of the input channel (5) is connected to the top of the sealing plug (3) with a high-pressure nozzle (501), and the lower end is connected to the side wall or end of the screw (4) with a manual valve (502) that can be connected to an external pipeline.

7. A valve body casting for easy sand removal according to claim 6, characterized in that: The high-pressure nozzle (501) is a multi-angle fan-shaped nozzle or a rotating nozzle, and its spray direction is toward the internal flow channel (101) of the valve body (1).

8. A valve body casting for easy sand removal according to claim 1, characterized in that: The cleaning port (202) is internally threaded with a sealing bolt (6), and the bottom inner wall of the temporary storage chamber (2) is a guide slope that is smoothly inclined toward the cleaning port (202).

9. A valve body casting for easy sand removal according to claim 6, characterized in that: The inner walls of the temporary storage chamber (2) are all smooth curved surfaces, and the joints are smoothly transitioned. The bottom outer wall of the temporary storage chamber (2) is provided with a matching moisture-proof shell (7).

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