Pilot-operated type low-leakage regulating valve

Abstract

The utility model discloses a pilot-operated type low-leakage regulating valve, and relates to the technical field of regulating valves. According to the technical scheme, a regulating valve body is fixedly connected with a sewage draining exit, and the sewage draining exit is connected with a detachable filtering piece in a screwed mode; the filter element comprises a shell part which is connected with the drain outlet in a screwing manner, the shell part forms a channel for conveying a water body, a liquid inlet of the channel is communicated with the liquid inlet end of the regulating valve body, and a filter screen for filtering the water body is mounted on a liquid outlet of the channel. The shell part is fixed in the valve body, when the device conveys liquid, the liquid is filtered through the filter screen on the shell part, impurities are retained in the shell part, the valve body can be cleaned only by disassembling the shell, the valve body does not need to be disassembled for cleaning, the cleaning difficulty of the device is reduced, and the cleaning efficiency of the device is improved.

Description

Technical Field

[0001] This utility model relates to the field of regulating valve technology, specifically a pilot-operated low-leakage regulating valve. Background Technology

[0002] Control valves, as key actuators in industrial automation control systems, are widely used in numerous fields such as petroleum, chemical, power, and metallurgy. Their main function is to precisely regulate parameters such as flow rate, pressure, and temperature of the medium to ensure stable operation of the production process and product quality. With the continuous advancement of industrial technology, the performance requirements for control valves are also increasing. They not only need high-precision regulation capabilities but also low leakage, high reliability, and long service life. Existing control valves need to transport liquids for extended periods during operation. However, because they lack a filtration structure, impurities in the liquid are transported along with the pipeline, and some of these impurities have a certain probability of remaining in the control valve. Over time, the valve body gradually becomes clogged with impurities. Cleaning existing control valves is relatively difficult and requires disassembly, resulting in high cleaning difficulty and low cleaning efficiency. Utility Model Content

[0003] The purpose of this invention is to provide a pilot-operated low-leakage regulating valve to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a pilot-operated low-leakage regulating valve, comprising a regulating valve body, a drain port fixedly connected to the regulating valve body, and a valve core installed on the regulating valve body to connect or disconnect its inlet and outlet ends, the drain port being connected to the inlet end of the regulating valve body, and a detachable filter element being screwed onto the drain port.

[0005] The filter element includes a housing portion that is screwed into the drain outlet. The housing portion forms a channel for conveying water. The inlet of the channel is connected to the inlet end of the regulating valve body. The outlet of the channel is located between the inlet end of the regulating valve body and the valve core. A filter screen for filtering water is installed on the outlet of the channel.

[0006] Preferably, the housing portion includes a liquid guide shell, one end of which is fixedly connected to a connector and the other end is fixedly connected to a sealing plate. The connector is located outside the regulating valve body, and the sealing plate is located inside the liquid inlet end of the regulating valve body. The sealing plate is recessed to form multiple liquid permeation holes, and a filter screen is fixedly connected inside the liquid permeation holes. The peripheral surface of the liquid guide shell is open to form a liquid inlet hole for liquid to enter.

[0007] Preferably, a rotating shaft is rotatably connected between the connector and the sealing plate. The rotating shaft is located inside the liquid guiding shell, and multiple side plates are fixedly connected in a ring array on the circumference of the rotating shaft. At least one connecting plate is also fixedly connected to the circumference of the rotating shaft. A brush for scraping the liquid inlet side of the filter screen is adhered to one side of the connecting plate.

[0008] Preferably, a guide cover is fixedly connected inside the liquid inlet hole, and a through hole for water to pass through is formed on the guide cover, and an angle α is formed between the guide cover and the axis of the rotating shaft, where 0° < angle α < 90°.

[0009] Preferably, two rubber films are symmetrically bonded inside the through hole, and the gap between the two rubber films on the side closest to the rotating shaft is smaller than the gap on the other side.

[0010] Preferably, the regulating valve body includes a valve body, the drain port is formed on the valve body, and the valve core is installed inside the valve body. A liquid guide hole is integrally formed between the liquid inlet end and the liquid outlet end of the valve body, and the liquid guide hole matches the sealing plate.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] (1) By setting up a drain outlet and a housing part, the housing part is connected to the drain outlet, so that the housing part is fixed inside the valve body. When the device transports liquid, the liquid is filtered through the filter screen on the housing part, so that impurities are retained in the housing part. Only the housing part needs to be disassembled to clean the valve body. There is no need to disassemble the valve body for cleaning, which reduces the cleaning difficulty of the device and improves the cleaning efficiency of the device.

[0013] (2) By setting up an inlet hole, side plate, rotating shaft, brush and connecting plate, the liquid is guided to flush the side plate through the inlet hole, so that the side plate drives the rotating shaft and connecting plate to rotate, and the brush continuously scrapes the filter screen, so that the filter screen can continuously filter the liquid, avoid the filter screen from clogging the impurities, and improve the efficiency of the device in filtering liquid.

[0014] (3) By setting an inclined guide cover, when water flows into the device, the guide cover guides the water flow, so that when the water enters the liquid guide shell, it enters at an inclined angle with the side plate, thereby increasing the force of the water, increasing the rotation speed of the side plate, and thus increasing the frequency of the brush cleaning the filter screen.

[0015] (4) By setting two rubber membranes inside the guide cover, and the gap between the two rubber membranes is different from the gap on the other side, impurities cannot flow back after passing through the two rubber membranes, thereby improving the impurity interception efficiency. Attached Figure Description

[0016] Figure 1 This is one of the perspective views of this utility model;

[0017] Figure 2 This is a second perspective view of the present invention;

[0018] Figure 3 This is a cross-sectional view of the present invention;

[0019] Figure 4 for Figure 3 A cross-sectional view with the filter removed;

[0020] Figure 5 This is one of the perspective views of the filter element of this utility model;

[0021] Figure 6 A perspective view of the filter element of this utility model with the filter screen removed;

[0022] Figure 7 for Figure 6 A three-dimensional view after the guide shell has separated;

[0023] Figure 8 This is a cross-sectional view of the guide shell of this utility model;

[0024] Figure 9 for Figure 6 One of the 3D views of the guide shell removed;

[0025] Figure 10 for Figure 6 3D view of the guide shell removed (part two);

[0026] Figure 11 for Figure 10 A 3D view with the side panels removed;

[0027] Figure 12 This is a top view of the liquid guiding shell and the guide cover of this utility model when they are connected;

[0028] In the diagram: 1. Valve body; 2. Drain outlet; 3. Filter element; 31. Connector; 32. Liquid guide shell; 33. Sealing plate; 34. Guide cover; 35. Liquid permeation hole; 36. Filter screen; 37. Rotating shaft; 38. Side plate; 39. Rubber membrane; 310. Connecting plate; 311. Brush; 312. Liquid inlet; 4. Valve core; 5. Liquid guide hole. Detailed Implementation

[0029] 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.

[0030] Please see Figures 1 to 12As shown, one embodiment of this utility model is provided: a pilot-operated low-leakage regulating valve, including a regulating valve body, a drain port 2 fixedly connected to the regulating valve body, and a valve core 4 installed on the regulating valve body to connect or disconnect its liquid inlet and liquid outlet. The drain port 2 is connected to the liquid inlet of the regulating valve body, and a detachable filter element 3 is screwed onto the drain port 2.

[0031] The filter element 3 includes a housing portion that is screwed into the drain port 2. The inner wall of the drain port 2 and the outer wall of the housing portion are respectively formed with matching internal and external threads. The housing portion forms a channel for conveying water. The inlet of the channel is connected to the inlet end of the regulating valve body. The outlet of the channel is located between the inlet end of the regulating valve body and the valve core 4. A filter screen 36 for filtering water is installed on the outlet of the channel.

[0032] With the above technical solution, when personnel use the device, the water conveying pipe is connected to the regulating valve body. Before the water is conveyed through the regulating valve body, the filter element 3 is screwed onto the drain port 2, fixing the housing part inside the drain port 2. The valve core 4 is opened, connecting the inlet and outlet ends of the regulating valve body. When the regulating valve body conveys water, the water enters from the inlet end of the regulating valve body, then flows from the inlet of the housing part to the outlet of the housing part. When the water passes through the outlet, it is filtered by the filter screen 36, causing impurities in the water to be retained in the housing part. In the process, the filtered water is discharged through the outlet of the regulating valve body, allowing the regulating valve body to continuously filter the water and prevent impurities in the water from clogging the regulating valve body. When it is necessary to clean the impurities in the housing, close the valve core 4 to interrupt the liquid inlet and outlet of the regulating valve body, rotate the housing to separate the housing from the drain port 2, and the impurities in the housing can be cleaned. The water will be discharged through the drain port 2, carrying away some of the remaining impurities. After cleaning, screw the housing back into the drain port 2 and reopen the valve core 4 to allow the regulating valve body to work normally.

[0033] Specifically, in one embodiment, regarding the aforementioned housing portion, such as Figures 1-3 , Figures 5-8 As shown, the housing includes a liquid guide shell 32. One end of the liquid guide shell 32 is fixedly connected to a connector 31, and the other end is fixedly connected to a sealing plate 33. The connector 31 is located outside the regulating valve body, and the sealing plate 33 is located inside the liquid inlet end of the regulating valve body. Multiple liquid permeation holes 35 are formed by recesses on the sealing plate 33. A filter screen 36 is fixedly connected inside the liquid permeation holes 35. The peripheral surface of the liquid guide shell 32 is open to form a liquid inlet hole 312 for liquid to enter.

[0034] In this embodiment, before using the regulating valve body, the liquid guide shell 32 is screwed into the drain port 2 to fix the liquid guide shell 32 in the drain port 2. The bottom of the drain port 2 is blocked by the connector 31. When water is input through the inlet end of the regulating valve body, the water flows into the interior of the liquid guide shell 32 through the inlet hole 312. Then the water flows into the sealing plate 33. Since the sealing plate 33 has a liquid permeation hole 35, the water will flow through the liquid permeation hole 35 to the outlet end of the regulating valve body. When the liquid passes through the liquid permeation hole 35, it is filtered by the filter screen 36, so that the impurities in the water are retained in the liquid guide shell 32. When it is necessary to clean the impurities, rotate the liquid guide shell 32 to separate the liquid guide shell 32 from the drain port 2, so that the impurities can be cleaned.

[0035] Since impurities need to be cleaned regularly, when impurities are inside the liquid guide shell 32, in order to prevent impurities from clogging the filter screen 36, such as... Figure 7 , Figure 9 and Figure 10 As shown, a rotating shaft 37 is rotatably connected between the connector 31 and the sealing plate 33. The rotating shaft 37 is located inside the liquid guiding shell 32, and multiple side plates 38 are fixedly connected in a ring array on the circumference of the rotating shaft 37. At least one connecting plate 310 is also fixedly connected to the circumference of the rotating shaft 37. A brush 311 for scraping the liquid inlet side of the filter screen 36 is attached to one side of the connecting plate 310.

[0036] In this embodiment, when water enters the liquid guide shell 32 through the liquid inlet 312, the water will wash the side plate 38, causing the side plate 38 to drive the rotating shaft 37 to rotate around the sealing plate 33. When the rotating shaft 37 rotates, it will simultaneously drive the connecting plate 310 to rotate. The connecting plate 310 drives the brush 311 to rotate continuously, thereby allowing the brush 311 to continuously scrape the liquid inlet side of the filter screen 36, so that the filter screen 36 can continuously filter water and prevent the filter screen 36 from being blocked by impurities and unable to work properly.

[0037] To improve the efficiency of brush 311 in scraping filter screen 36, such as Figure 8 As shown, a guide cover 34 is fixedly connected inside the liquid inlet 312. A through hole for water supply is formed on the guide cover 34, and an angle α is formed between the guide cover 34 and the axis of the rotating shaft 37. Figure 12 As shown, 0° < included angle α < 90°. When water needs to flow into the liquid guide shell 32, a guide cover 34 is fixed inside the liquid inlet 312. The angle between the guide cover 34 and the rotating shaft 37 is an acute angle. Therefore, when the guide cover 34 discharges water, the water will tilt and scour the side plate 38, thereby increasing the rotation efficiency of the side plate 38. This, in turn, increases the efficiency of the rotating shaft 37 in driving the connecting plate 310 and the brush 311 to rotate, thereby improving the cleaning efficiency of the filter screen 36.

[0038] Furthermore, in this invention, when impurities are retained inside the liquid guiding shell 32, to prevent backflow of impurities, such as... Figure 8 As shown, two rubber membranes 39 are symmetrically bonded inside the through hole. The gap between the two rubber membranes 39 on the side closer to the rotating shaft 37 is smaller than the gap on the other side. When impurities pass through the gap between the two rubber membranes 39, they will be blocked because the gap between the two rubber membranes 39 on the side closer to the rotating shaft 37 is smaller than the gap on the other side, and thus remain in the liquid guide shell 32.

[0039] Specifically, in one implementation, such as Figures 1-4 As shown, the regulating valve body includes a valve body 1. A sealing ring is provided at the connection of the valve body 1 to increase the sealing performance of the valve body 1. A drain port 2 is formed on the valve body 1, and the valve core 4 is installed inside the valve body 1. A liquid guide hole 5 is integrally formed between the liquid inlet end and the liquid outlet end of the valve body 1, and the liquid guide hole 5 matches the sealing plate 33.

[0040] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A pilot operated low-leakage control valve characterized by: Includes a regulating valve body, on which a drain port (2) is fixedly connected, and a valve core (4) is installed on the regulating valve body to connect or disconnect its liquid inlet and liquid outlet. The drain port (2) is connected to the liquid inlet of the regulating valve body, and a detachable filter element (3) is screwed onto the drain port (2). The filter element (3) includes a housing portion that is screwed into the drain port (2). The housing portion forms a channel for conveying water. The inlet of the channel is connected to the inlet end of the regulating valve body. The outlet of the channel is located between the inlet end of the regulating valve body and the valve core (4). A filter screen (36) for filtering water is installed on the outlet of the channel.

2. A pilot operated low-leakage control valve according to claim 1, characterized in that: The housing includes a liquid guide shell (32), one end of which is fixedly connected to a connector (31), and the other end is fixedly connected to a sealing plate (33). The connector (31) is located outside the regulating valve body, and the sealing plate (33) is located inside the liquid inlet end of the regulating valve body. Multiple liquid permeation holes (35) are formed by recesses on the sealing plate (33). A filter screen (36) is fixedly connected inside the liquid permeation holes (35). The peripheral surface of the liquid guide shell (32) is open to form a liquid inlet hole (312) for liquid to enter.

3. A pilot operated low-leakage control valve according to claim 2, characterized in that: A rotating shaft (37) is rotatably connected between the connector (31) and the sealing plate (33). The rotating shaft (37) is located inside the liquid guiding shell (32), and multiple side plates (38) are fixedly connected to the circumferential surface of the rotating shaft (37) in a ring array. At least one connecting plate (310) is also fixedly connected to the circumferential surface of the rotating shaft (37). A brush (311) for scraping the liquid inlet side of the filter screen (36) is glued to one side of the connecting plate (310).

4. A pilot operated low-leakage control valve according to claim 3, wherein: The inlet hole (312) is fixedly connected to a guide cover (34), and a through hole for water to pass through is formed on the guide cover (34). An angle α is formed between the guide cover (34) and the axis of the rotating shaft (37), where 0° < angle α < 90°.

5. A pilot operated low-leakage control valve according to claim 4, characterized in that: Two rubber membranes (39) are symmetrically bonded inside the through hole, and the gap between the two rubber membranes (39) on the side closer to the rotating shaft (37) is smaller than the gap on the other side.

6. A pilot operated low-leakage control valve according to any one of claims 2-5, characterized in that: The regulating valve body includes a valve body (1), the drain port (2) is formed on the valve body (1), and the valve core (4) is installed inside the valve body (1). A liquid guide hole (5) is integrally formed between the liquid inlet end and the liquid outlet end of the valve body (1), and the liquid guide hole (5) matches the sealing plate (33).

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