Pilot spill compensation valve and piping system

Abstract

The application relates to the technical field of valves and discloses a pilot overflow oil supplement valve and a pipeline system, which comprises a valve body, a valve seat and a pilot assembly. The valve body is provided with a valve cavity, a first oil hole and a second oil hole. At least part of the valve seat is fixedly installed in the valve cavity. The valve seat is provided with a mounting cavity, a first flow channel and a third oil hole. The third oil hole is communicated with the second oil hole. The pilot overflow oil supplement valve further comprises a filter screen and a filter screen seat. An inner wall of the first flow channel is provided with an inner thread. An outer wall of the filter screen seat is provided with an outer thread. The outer thread is screwed with the inner thread so that the filter screen seat is fixedly installed in the first flow channel. The filter screen is arranged in the first flow channel and is located on the side, away from the first oil hole, of the filter screen seat along the axial direction of the valve body. The filter screen seat is provided with a first through hole. The assembly process is simplified. Only screwing is needed, the assembly efficiency is improved, meanwhile, the assembly parts are reduced, and the assembly time and cost are saved.

Description

Technical Field

[0001] This application relates to the field of valve technology, and in particular to a pilot-operated overflow replenishing valve and its piping system. Background Technology

[0002] Pilot-operated overflow valves, as flow regulating devices in pipeline systems, are widely used in fields such as water conservancy, HVAC, and industrial fluid control.

[0003] In related technologies, the filter screen in the pilot-operated overflow oil replenishment valve is used to filter impurities in the oil entering the pilot assembly to prevent serious blockage of the pilot-operated overflow oil replenishment valve. However, the current installation method of the filter screen and filter screen holder is relatively complicated and difficult to install. After the filter screen holder is installed, it usually needs to be limited by a steel wire retaining ring, which makes the installation process cumbersome and reduces the installation efficiency. Utility Model Content

[0004] This application provides a pilot-operated overflow oil replenishment valve and pipeline system, which solves the technical problem of complex installation of filter screen and filter screen holder, reduces installation difficulty, and improves installation efficiency.

[0005] To achieve the above objectives, the main technical solutions adopted in this application include:

[0006] In a first aspect, embodiments of this application provide a pilot-operated overflow replenishing valve, characterized in that it includes:

[0007] The valve body has a valve cavity, a first oil hole, and a second oil hole;

[0008] The valve seat is arranged opposite to and spaced apart from the first oil hole along the axial direction of the valve body. At least a portion of the valve seat is fixedly installed in the valve cavity. The valve seat has an installation cavity, a first flow channel and a third oil hole. The first flow channel is selectively connected to or disconnected from the first oil hole, and the third oil hole is connected to the second oil hole.

[0009] A pilot assembly is movably disposed in the mounting cavity to allow the first flow channel to communicate with or be isolated from the third oil hole;

[0010] The pilot-operated overflow oil replenishment valve also includes a filter screen and a filter screen seat. The inner wall of the first flow channel is provided with an internal thread, and the outer wall of the filter screen seat is provided with an external thread. The external thread and the internal thread are threaded together to fix the filter screen seat in the first flow channel. The filter screen is set in the first flow channel and along the axial direction of the valve body. The filter screen is located on the side of the filter screen seat away from the first oil hole. The filter screen seat is provided with a first through hole.

[0011] According to the pilot-operated overflow oil replenishing valve proposed in the embodiments of this application, the inner wall of the first flow channel of the valve seat is provided with an internal thread, and the outer wall of the filter screen seat is provided with an external thread. When the filter screen is installed into the first flow channel, the filter screen is fixed in the first flow channel by the thread between the external thread and the internal thread. This setting simplifies the assembly process, only requires threaded installation, and improves assembly efficiency. At the same time, there is no need to use a wire retaining ring for limiting, reducing the number of assembly parts and helping to save assembly time and cost. Compared with interference fit assembly, threaded installation has lower requirements for machining accuracy and is simpler to process.

[0012] Optionally, along the axial direction of the valve body, the first flow channel includes a first section and a second section connected in sequence, the first section being farther away from the first oil hole than the second section, and the inner diameter of the first section being smaller than the inner diameter of the second section to form a first limiting part;

[0013] The inner wall of the second section has internal threads, and the filter screen seat is fixedly installed inside the second section. Along the axial direction of the valve body, the filter screen is set between the first limiting part and the filter screen seat.

[0014] Optionally, the pilot-operated overflow replenishing valve also includes a spring seat, which is fixedly installed in the mounting cavity, and the mounting cavity is connected to the first flow channel and the third oil hole;

[0015] The pilot assembly includes a pilot valve core and a first spring. Along the axial direction of the valve body, the first spring is abutted between the spring seat and the pilot valve core, and the pilot valve core is movably disposed between the spring seat and the first flow channel so that the pilot valve core blocks or opens the first flow channel.

[0016] Optionally, the valve seat has a first damping flow channel, and the mounting cavity is connected to the first flow channel through the first damping flow channel. The inner diameter of the first damping flow channel is smaller than the inner diameter of the first flow channel. Along the axial direction of the valve body, the pilot valve core is movably disposed in the mounting cavity to block or open the first damping flow channel.

[0017] Optionally, the pilot-operated overflow replenishing valve further includes a first valve core assembly and a second valve core assembly. Along the axial direction of the valve body, a portion of the second valve core assembly is disposed between the first flow channel and the first oil hole. The second valve core assembly is slidably fitted on the outer peripheral surface of the valve seat, and the second valve core assembly is movably disposed in the valve cavity so that the first oil hole and the second oil hole are connected or disconnected.

[0018] A portion of the first valve core assembly is movably disposed on the second valve core assembly to allow the first flow channel to communicate with or be isolated from the first oil hole.

[0019] Optionally, the first valve core assembly includes a first valve core and a second spring. Along the axial direction of the valve body, the second spring is abutted between the filter screen seat and the first valve core, and the first valve core is movable relative to the second valve core assembly to allow the first flow channel to communicate with or be isolated from the first oil hole.

[0020] Optionally, the second valve core assembly includes a valve sleeve, a second valve core, and a third spring. The valve sleeve is disposed in the valve cavity, and a portion of the valve sleeve is slidably fitted onto the outer peripheral surface of the valve seat. The valve sleeve has a fourth oil hole, which communicates with the second oil hole.

[0021] The second valve core and the third spring are both located inside the valve sleeve. Along the axial direction of the valve body, the third spring is abutted between the valve seat and the second valve core, and the second valve core is movable relative to the valve sleeve so that the fourth oil hole can be connected to or disconnected from the first oil hole.

[0022] Along the axial direction of the valve body, a portion of the valve sleeve is located between the second valve core and the valve body. The valve sleeve is movably located in the valve cavity to allow the first oil hole to communicate with or be separated from the second oil hole.

[0023] Optionally, the first valve core has a second damping flow channel, which includes an oil inlet and an oil outlet. The oil inlet is located on the side wall of the first valve core, and the oil outlet communicates with the first flow channel.

[0024] The second valve core has a guide hole, and the first valve core is movably disposed in the guide hole. The inner wall of the guide hole is adapted to open the oil inlet hole so that the oil inlet hole communicates with the first oil hole, or to block the oil inlet hole so that the oil inlet hole is isolated from the first oil hole.

[0025] Optionally, the pilot-operated relief valve also includes an adjusting rod, along the axial direction of the valve body, with a spring seat abutting between the adjusting rod and the first spring, the adjusting rod being adapted to adjust the elastic force of the first spring.

[0026] Secondly, embodiments of this application provide a pipeline system including the pilot-operated overflow replenishing valve in the first aspect embodiment.

[0027] According to the pipeline system proposed in the embodiments of this application, by setting the above-mentioned pilot-operated overflow oil replenishment valve, the inner wall of the first flow channel of the valve seat is provided with internal threads, and the outer wall of the filter screen seat is provided with external threads. When the filter screen is installed into the first flow channel, the filter screen is restricted in the first flow channel by the thread between the external thread and the internal thread. This setting simplifies the assembly process, only requires threaded installation, improves assembly efficiency, and eliminates the need for steel wire retaining rings for limiting, reducing assembly parts and saving assembly time and cost. Compared with interference fit assembly, threaded installation has lower requirements for machining accuracy and is simpler to process. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 A cross-sectional view of a pilot-operated overflow replenishing valve provided in one embodiment of this application;

[0030] Figure 2 A cross-sectional view of a valve seat provided in one embodiment of this application;

[0031] Figure 3 A cross-sectional view of a filter holder provided in one embodiment of this application;

[0032] Figure 4 A cross-sectional view of a first valve core provided in one embodiment of this application.

[0033] [Explanation of Labels in the Attached Image]

[0034] 100-type pilot-operated overflow replenishing valve;

[0035] Valve body 1; Valve cavity 11; First oil hole 12; Second oil hole 13;

[0036] Valve seat 2; mounting cavity 21; first flow channel 22; first section 221; second section 222; internal thread 2221; first limiting part 223; third oil hole 23; first damping flow channel 24;

[0037] Pilot assembly 3; pilot valve core 31; first spring 32;

[0038] First valve core assembly 4; First valve core 41; Second damping flow channel 411; Oil inlet 4111; Oil outlet 4112; Second spring 42;

[0039] Filter screen 5;

[0040] Filter holder 6; external thread 61; first through hole 62;

[0041] Spring seat 7;

[0042] Second valve core assembly 8; valve sleeve 81; fourth oil hole 811; drive part 812; mounting through hole 813; second valve core 82; third spring 83;

[0043] Adjusting rod 9;

[0044] Adjusting nut 10;

[0045] First direction X. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0047] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0048] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0049] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0050] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0051] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0052] It should be noted that the pilot-operated overflow valve, as a flow regulating device in the pipeline system, is widely used in fields such as water conservancy, HVAC and industrial fluid control.

[0053] In related technologies, the filter screen in the pilot-operated relief oil replenishment valve is used to filter impurities in the oil entering the pilot assembly to prevent severe blockage of the pilot-operated relief oil replenishment valve. However, the current installation and fixing method of the filter screen is relatively complicated. The filter screen must first be installed into the valve seat, and then the filter screen seat and the valve seat must be assembled with an interference fit to fix the filter screen in the valve seat. Since the filter screen seat is small and installation requires the use of special tooling for guiding and pressing, the installation is difficult and inefficient. At the same time, after the filter screen seat is interference fitted, a steel wire retaining ring is also required to limit its movement, making the installation process cumbersome and further reducing the installation efficiency.

[0054] Based on this, this application proposes a pilot-operated overflow oil replenishment valve 100 and a pipeline system. The inner wall of the first flow channel 22 of the valve seat 2 is provided with an internal thread 2221, and the outer wall of the filter screen seat 6 is provided with an external thread 61. When the filter screen 5 is installed into the first flow channel 22, the filter screen 5 is restricted within the first flow channel 22 by the thread between the external thread 61 and the internal thread 2221. This setting simplifies the assembly process, requiring only threaded installation, thus improving assembly efficiency. At the same time, there is no need to use a wire retaining ring for limiting, reducing the number of assembly parts and saving assembly time and costs. Compared with interference fit assembly, threaded installation has lower requirements for machining accuracy and is simpler to process.

[0055] The pilot-operated overflow oil replenishing valve 100 and its piping system according to embodiments of this application are described below with reference to the accompanying drawings.

[0056] like Figures 1-4 As shown, the pilot-operated overflow replenishing valve 100 according to the first aspect embodiment of this application includes: a valve body 1, a valve seat 2, and a pilot assembly 3. The valve body 1 has a valve cavity 11, a first oil hole 12, and a second oil hole 13. Along the axial direction of the valve body 1, the valve seat 2 is disposed opposite to and spaced apart from the first oil hole 12. At least a portion of the valve seat 2 is fixedly installed in the valve cavity 11. The valve seat 2 has an mounting cavity 21, a first flow channel 22, and a third oil hole 23. The first flow channel 22 is selectively connected to or disconnected from the first oil hole 12, and the third oil hole 23 is connected to the second oil hole 13. The pilot assembly 3 can... The valve is movably disposed in the mounting cavity 21 so that the first flow channel 22 is connected to or separated from the third oil hole 23. The pilot-operated overflow oil replenishment valve 100 also includes a filter screen 5 and a filter screen seat 6. The inner wall of the first flow channel 22 is provided with an internal thread 2221, and the outer wall of the filter screen seat 6 is provided with an external thread 61. The external thread 61 is threadedly connected to the internal thread 2221 so that the filter screen seat 6 is fixedly installed in the first flow channel 22. The filter screen 5 is disposed in the first flow channel 22 and along the axial direction of the valve body 1. The filter screen 5 is located on the side of the filter screen seat 6 away from the first oil hole. The filter screen seat 6 is provided with a first through hole 62.

[0057] Specifically, the pilot-operated overflow replenishing valve 100 is based on... Figure 1 Taking the placement direction shown as an example, the axial direction of valve body 1 is parallel to the first direction X, which is the left and right direction.

[0058] The valve body 1 has a valve cavity 11, a first oil hole 12 and a second oil hole 13. Optionally, along the axial direction of the valve body 1, the first oil hole 12 is located at the right end of the valve body 1 and the second oil hole 13 is located on the side wall of the valve body 1.

[0059] Continue to refer to Figure 1 As shown, along the axial direction of the valve body 1, the valve seat 2 is disposed on the left side opposite to and spaced apart from the first oil hole 12, wherein at least a portion of the valve seat 2 is fixedly installed within the valve cavity 11. It can be understood that the valve seat 2 may be partially or entirely disposed within the valve cavity 11. For example, the valve seat 2 is fixed to the valve body 1 via a threaded connection, with a portion of the valve seat 2 inserted into the valve cavity 11, and the other portion of the valve seat 2 abutting against the left end face of the valve body 1.

[0060] Valve seat 2 has mounting cavity 21, first flow channel 22 and third oil hole 23. Along the axial direction of valve body 1, first flow channel 22 is located between mounting cavity 21 and first oil hole 12. Optionally, such as Figure 1 As shown, the first flow channel 22 is located on the right side of the mounting cavity 21, and the third oil hole 23 is located on the side wall of the valve seat 2. The third oil hole 23 is always connected to the second oil hole 13. For example, the third oil hole 23 can be connected to the second oil hole 13 through the internal flow channel formed by the valve seat 2 and the valve body 1, or it can be connected to the second oil hole 13 through the flow channel in the valve body 1. No specific restrictions are made here. Furthermore, the first flow channel 22 can be selectively connected to or disconnected from the first oil hole 12. That is to say, the first flow channel 22 can be connected to or disconnected from the first oil hole 12.

[0061] Furthermore, the pilot-operated overflow replenishing valve 100 also includes a pilot assembly 3, which is mainly used to control the on / off state of the pilot oil, such as... Figure 1 As shown, the pilot component 3 is movably disposed in the mounting cavity 21 so that the first flow channel 22 and the third oil hole 23 are connected or disconnected. For example, the first flow channel 22 and the third oil hole 23 are initially connected. When the pilot component 3 moves in the mounting cavity 21, if the pilot component 3 blocks the first flow channel 22, the first flow channel 22 and the third oil hole 23 are disconnected. When the pilot component 3 no longer blocks the first flow channel 22, the first flow channel 22 and the third oil hole 23 are connected.

[0062] When the first flow channel 22 is connected to the third oil hole 23 and the first flow channel 22 is connected to the first oil hole 12, the pilot oil provided by the first oil hole 12 flows out through the second oil hole 13 after passing through the first flow channel 22 and the third oil hole 23. Since impurities in the pilot oil may block the first flow channel 22, the pilot assembly 3 may fail to open or open with a delay, thus causing the pilot-operated overflow valve to malfunction. To remove impurities from the pilot oil, such as... Figure 1 As shown, the pilot-operated overflow oil replenishment valve 100 is also equipped with a filter screen 5 and a filter screen seat 6.

[0063] The inner wall of the first flow channel 22 is provided with an internal thread 2221, and the outer wall of the filter screen seat 6 is provided with an external thread 61. When installing the filter screen 5 and the filter screen seat 6, along the axial direction of the valve body 1, the filter screen 5 is first installed into the first flow channel 22 from the right end. Then, the filter screen seat 6 is screwed from the right end of the first flow channel 22 into the first flow channel 22 by the thread drive of the external thread 61 and the internal thread 2221. In this way, the filter screen seat 6 is fixed to the first flow channel 22, and the filter screen 5 is confined within the first flow channel 22.

[0064] It is understandable that, such as Figure 1 and Figure 3 As shown, the filter holder 6 is provided with a first through hole 62 extending axially along the valve body 1. When the first flow channel 22 is connected to the third oil hole 23 and the first flow channel 22 is connected to the first oil hole 12, the pilot oil flowing in from the first oil hole 12 flows through the first through hole 62, through the filter screen 5, the mounting cavity 21, and the third oil hole 23, and then flows out from the second oil hole 13, thereby achieving filtration of the inflowing pilot oil and preventing impurities from clogging it. Compared with the traditional interference fit assembly of the filter holder 6 and the valve seat 2, the assembly process is simplified, and only threaded installation is required, which improves the assembly efficiency. When the filter screen 5 needs to be replaced, it can be disassembled by using the thread drive. Compared with the interference fit assembly, the disassembly of the filter holder 6 is also more convenient. At the same time, the filter holder 6 is fixed by threads and there is no need to use a steel wire retainer to limit its position, which reduces the use of assembly parts and helps to save assembly time and costs.

[0065] Furthermore, the interference fit of the filter screen seat 6 and valve seat 2 requires strict control of dimensional tolerances to ensure effective control of the interference amount. Threaded installation has lower requirements for machining accuracy, making machining simpler and reducing machining difficulty.

[0066] In summary, according to the pilot-operated overflow oil replenishing valve 100 proposed in the embodiments of this application, the inner wall of the first flow channel 22 of the valve seat 2 is provided with an internal thread 2221, and the outer wall of the filter screen seat 6 is provided with an external thread 61. When the filter screen 5 is installed into the first flow channel 22, the filter screen 5 is restricted within the first flow channel 22 by the thread fixation between the external thread 61 and the internal thread 2221. This setting simplifies the assembly process, requiring only threaded installation, thus improving assembly efficiency. At the same time, there is no need to use a wire retaining ring for limiting, reducing the number of assembly parts and saving assembly time and costs. Compared with interference fit assembly, threaded installation has lower requirements for machining accuracy and is simpler to process.

[0067] In some embodiments of this application, such as Figure 1 and Figure 2 As shown, along the axial direction of the valve body 1, the first flow channel 22 includes a first section 221 and a second section 222 connected in sequence. The first section 221 is farther away from the first oil hole 12 than the second section 222. The inner diameter of the first section 221 is smaller than the inner diameter of the second section 222 to form a first limiting part 223. The inner wall of the second section 222 has an internal thread 2221. The filter screen seat 6 is fixedly installed in the second section 222. Along the axial direction of the valve body 1, the filter screen 5 is disposed between the first limiting part 223 and the filter screen seat 6.

[0068] Specifically, such as Figure 2 As shown, along the axial direction of the valve body 1, the first segment 221 is disposed between the mounting cavity 21 and the second segment 222. The inner diameter of the first segment 221 is smaller than the inner diameter of the second segment 222, so that a first limiting part 223 can be formed at the connection between the first segment 221 and the second segment 222. It can be understood that the first limiting part 223 is constructed as a first stepped surface.

[0069] When installing the filter screen 5 and the filter screen holder 6, the filter screen 5 is inserted into the second section 222 from the right end along the axial direction of the valve body 1. Then, the filter screen holder 6 is screwed from the right end of the second section 222 into the second section 222 using the external thread 61 and the internal thread 2221. In this way, the filter screen holder 6 is fixed to the second section 222, and the filter screen 5 is confined within the second section 222.

[0070] Optionally, along the axial direction of the valve body 1, the filter screen 5 can be abutted between the first stepped surface and the filter screen seat 6. This can more firmly confine the filter screen seat 6 within the first flow channel 22, preventing the filter screen 5 from detaching or tilting, which would reduce the filtration effect. At the same time, the first stepped surface is relatively simple to process, and the limiting is achieved by using the internal structure of the first flow channel 22, eliminating the need for separate limiting parts and further reducing the use of assembly parts, thereby further saving assembly time and costs.

[0071] In some embodiments of this application, such as Figure 1 As shown, the pilot-operated overflow replenishing valve 100 also includes a spring seat 7, which is fixedly installed in the mounting cavity 21. The mounting cavity 21 is connected to the first flow channel 22 and the third oil hole 23. The pilot assembly 3 includes a pilot valve core 31 and a first spring 32. Along the axial direction of the valve body 1, the first spring 32 is abutted between the spring seat 7 and the pilot valve core 31, and the pilot valve core 31 is movably disposed between the spring seat 7 and the first flow channel 22 so that the pilot valve core 31 blocks or opens the first flow channel 22.

[0072] Specifically, refer to Figure 1 and Figure 2 As shown, the mounting cavity 21 in the valve seat 2 is connected to the first flow channel 22 and the third oil hole 23. A spring seat 7 is fixedly installed in the mounting cavity 21, and along the axial direction of the valve body 1, the spring seat 7 is spaced apart from the first flow channel 22. The pilot valve core 31 and the first spring 32 are both arranged between the spring seat 7 and the first flow channel 22.

[0073] Along the axial direction of the valve body 1, the first spring 32 is abutted between the spring seat 7 and the pilot valve core 31. In the initial state, the pilot valve core 31 is located at its right extreme position under the elastic force of the first spring 32. At this time, the pilot valve core 31 blocks the first flow channel 22, that is, the first flow channel 22 and the third oil hole 23 are separated by the pilot valve core 31. When the oil pressure of the pilot oil flowing into the first flow channel 22 acting on the pilot valve core 31 is greater than the elastic force of the first spring 32, along the axial direction of the valve body 1, the pilot valve core... 31. Move to the left. At this time, the pilot valve core 31 opens the first flow channel 22. The first flow channel 22 is connected to the third oil hole 23 through the mounting cavity 21. That is, the pilot oil can flow from the first flow channel 22 through the mounting cavity 21 and then flow out from the third oil hole 23, and then flow back to the oil tank from the second oil hole 13. When the oil pressure of the pilot oil acting on the pilot valve core 31 is less than the elastic force of the first spring 32, under the drive of the first spring 32, along the axial direction of the valve body 1, the pilot valve core 31 moves to the right limit position to block the first flow channel 22.

[0074] With this configuration, the pilot valve core 31 is driven by the relationship between the first spring 32 and the pilot oil pressure, thereby realizing the on / off control of the pilot oil circuit. This not only meets the usage requirements of the pilot-operated overflow replenishing valve 100, but also simplifies the structure of the pilot assembly 3.

[0075] In some embodiments of this application, such as Figure 2 As shown, the valve seat 2 has a first damping flow channel 24, and the mounting cavity 21 is connected to the first flow channel 22 through the first damping flow channel 24. The inner diameter of the first damping flow channel 24 is smaller than the inner diameter of the first flow channel 22. Along the axial direction of the valve body 1, the pilot valve core 31 is movably disposed in the mounting cavity 21 to block or open the first damping flow channel 24.

[0076] Specifically, refer to Figure 1 As shown, the pilot valve core 31 has a sealing cone surface. When the pilot valve core 31 moves to the right limit position, the sealing cone surface of the pilot valve core 31 extends into the first damping flow channel 24 to block the first damping flow channel 24. At this time, the first flow channel 22 and the third oil hole 23 are separated by the pilot valve core 31. When the oil pressure of the pilot oil acting on the pilot valve core 31 is greater than the elastic force of the first spring 32, the pilot valve core 31 moves to the left and opens the first damping flow channel 24. At this time, the first flow channel 22 is connected to the third oil hole 23 through the mounting cavity 21 and the first damping flow channel 24.

[0077] Furthermore, the inner diameter of the first damping flow channel 24 is smaller than that of the first flow channel 22, thereby generating significant throttling resistance to the oil flowing towards the pilot valve core 31. By limiting the flow rate entering the pilot valve core 31, it ensures that only a small portion of the total system flow (referred to as the pilot flow rate) flows through the pilot valve core 31 back to the oil tank. This is because the pilot valve core 31 itself is a small-flow, precision high-pressure valve designed to handle relatively small flow rates to control the main valve. If a large amount of high-pressure oil is allowed to directly impact the pilot valve core 31, it will cause the pilot valve core 31 to operate roughly, wear to increase, pressure control to become unstable, and may even damage the precision pilot valve sealing cone surface. Therefore, limiting the pilot flow rate can ensure that the pilot valve core 31 operates within a safe and controllable flow range.

[0078] Understandably, due to the limitation of the first damping flow channel 24, the rapid fluctuation or impact of the pilot oil pressure will not be transmitted to the pilot valve core 31 instantly and completely. The first damping flow channel 24 acts like a "buffer" or "low-pass filter", slowing down the rise and fall of the pilot oil pressure.

[0079] In some embodiments of this application, such as Figure 1 As shown, the pilot-operated overflow oil replenishment valve 100 also includes a first valve core assembly 4 and a second valve core assembly 8. Along the axial direction of the valve body 1, a portion of the second valve core assembly 8 is disposed between the valve seat 2 and the first oil hole 12. The second valve core assembly 8 is slidably fitted on the outer peripheral surface of the valve seat 2, and the second valve core assembly 8 is movably disposed in the valve cavity 11 so that the first oil hole 12 and the second oil hole 13 are connected or disconnected. A portion of the first valve core assembly 4 is movably disposed in the second valve core assembly 8 so that the first flow channel 22 is connected or disconnected from the first oil hole 12.

[0080] Specifically, the second valve core assembly 8 is constructed as the main valve core assembly. The left end of the second valve core assembly 8 is slidably fitted on the outer peripheral surface of the valve seat 2 and along the axial direction of the valve body 1, so that part of the second valve core assembly 8 is located between the first flow channel 22 and the first oil hole 12. Thus, the second valve core assembly 8 and the valve seat 2 form an upper valve cavity 11.

[0081] Furthermore, the second valve core assembly 8 is movably disposed in the valve cavity 11 so that the first oil hole 12 and the second oil hole 13 are connected or disconnected. For example, such as... Figure 1 As shown, the valve cavity 11 inside the valve body 1 is connected to both the first oil hole 12 and the second oil hole 13. When the second valve core assembly 8 moves inside the valve cavity 11, if the second valve core assembly 8 blocks the first oil hole 12, the first oil hole 12 and the second oil hole 13 are disconnected. If the second valve core assembly 8 no longer blocks the first oil hole 12, the first oil hole 12 and the second oil hole 13 are connected.

[0082] The first valve core assembly 4 is mainly used to control whether the first oil hole 12 supplies oil to the first flow channel 22. Along the axial direction of the valve body 1, part of the first valve core assembly 4 is movably disposed in the second valve core assembly 8 so that the first flow channel 22 is connected to or disconnected from the first oil hole 12. For example, the second valve core assembly 8 is provided with a connecting flow channel that connects the first flow channel 22 and the first oil hole 12. The first valve core assembly 4 moves within the second valve core assembly 8. When the first valve core assembly 4 moves to a position that can block the connecting flow channel, the first flow channel 22 is disconnected from the first oil hole 12. When the first valve core assembly 4 moves to a position that no longer blocks the connecting flow channel, the first flow channel 22 is connected to the first oil hole 12.

[0083] As a specific example, when oil enters the first oil hole 12, assuming that the first oil hole 12 is initially blocked at the right limit position of the second valve core assembly 8, when the first flow channel 22 is connected to the third oil hole 23 and the first flow channel 22 is connected to the first oil hole 12, the pilot oil flows out from the second oil hole 13 after passing through the first flow channel 22 and the third oil hole 23. In this way, the oil pressure in the upper valve chamber 11 decreases. When the oil pressure difference between the oil pressure acting on the right end face of the second valve core assembly 8 and the oil pressure in the upper valve chamber 11 can push the second valve core assembly 8 to the left, the first oil hole 12 is connected to the second oil hole 13, thereby realizing the overflow function.

[0084] In some embodiments of this application, such as Figure 1 As shown, the first valve core assembly 4 includes a first valve core 41 and a second spring 42. Along the axial direction of the valve body 1, the second spring 42 is abutted between the filter screen seat 6 and the first valve core 41, and the first valve core 41 is movable relative to the second valve core assembly 8 so that the first flow channel 22 is connected to or disconnected from the first oil hole 12.

[0085] Specifically, the second valve core assembly 8 is provided with a connecting flow channel, which connects the first flow channel 22 and the first oil hole 12. The first valve core assembly 4 includes a first valve core 41 and a second spring 42. Along the axial direction of the valve body 1, the second spring 42 is abutted and installed between the filter screen seat 6 and the first valve core 41. The first valve core 41 is movably disposed in the connecting flow channel.

[0086] If, in the initial state, the first valve core 41 is located at the right limit position under the elastic force of the second spring 42, the first valve core 41 does not block the connecting flow channel. At this time, the first flow channel 22 is connected to the first oil hole 12. When the oil pressure of the oil flowing into the first oil hole 12 on the first valve core 41 is greater than the elastic force of the second spring 42, the first valve core 41 moves to the left along the axial direction of the valve body 1. When the first valve core 41 moves to a position that can block the connecting flow channel, the first flow channel 22 is separated from the first oil hole 12. When the oil pressure of the oil on the first valve core 41 is less than the elastic force of the second spring 42, under the drive of the second spring 42, the oil pressure moves to the right to the right limit position along the axial direction of the valve body 1, so that the first valve core 41 no longer blocks the connecting flow channel.

[0087] With this configuration, the first valve core 41 is driven by utilizing the relationship between the oil pressure of the second spring 42 and the first oil hole 12, and the driving method is simple and reliable.

[0088] In some embodiments of this application, such as Figure 1 As shown, the second valve core assembly 8 includes a valve sleeve 81, a second valve core 82, and a third spring 83. The valve sleeve 81 is disposed in the valve cavity 11, and a portion of the valve sleeve 81 is slidably fitted on the outer peripheral surface of the valve seat 2. The valve sleeve 81 has a fourth oil hole 811, which communicates with the second oil hole 13. The second valve core 82 and the third spring 83 are both disposed in the valve sleeve 81. Along the axial direction of the valve body 1, the third spring 83 is abutted and installed between the valve seat 2 and the second valve core 82, and the second valve core 82 is movable relative to the valve sleeve 81 so that the fourth oil hole 811 communicates with or is isolated from the first oil hole 12. Along the axial direction of the valve body 1, a portion of the valve sleeve 81 is disposed between the second valve core 82 and the valve body 1, and the valve sleeve 81 is movably disposed in the valve cavity 11 so that the first oil hole 12 communicates with or is isolated from the second oil hole 13.

[0089] Specifically, the valve sleeve 81 partially slides on the outer circumferential surface of the valve seat 2 and forms an installation through hole 813. The valve sleeve 81, valve body 1, and valve seat 2 together form a flow channel. The third oil hole 23 of the valve seat 2 is connected to the second oil hole 13 through the flow channel. The fourth oil hole 811 of the valve sleeve 81 is provided on the side wall of the valve sleeve 81 and is connected to the installation through hole 813. The valve sleeve 81 is located in the valve cavity 11, and the installation through hole 813 is connected to the first oil hole 12 through the valve cavity 11.

[0090] Furthermore, a second valve core 82 and a third spring 83 are provided in the mounting through hole 813. The second valve core 82 and the mounting through hole 813 form an upper valve cavity 11. Along the axial direction of the valve body 1, the third spring 83 is abutted and installed between the valve seat 2 and the second valve core 82. The second valve core 82 can move left and right in the mounting through hole 813. The second valve core 82 selectively blocks or opens the fourth oil hole 811.

[0091] As a specific example, suppose in the initial state, the first valve core 41 is located at its right limit position under the elastic force of the second spring 42, and the first valve core 41 does not block the connecting flow channel inside the second valve core 82. The second valve core 82 is located at its right limit position under the elastic force of the third spring 83. Figure 1 As shown, the second valve core 82 abuts against the driving part 812 of the valve sleeve 81. Under the elastic force of the third spring 83, the driving part 812 of the valve sleeve 81 abuts against the limiting structure in the valve cavity 11, that is, the valve sleeve 81 is also located at the right limit position. At this time, the valve sleeve 81 isolates the first oil hole 12 and the second oil hole 13.

[0092] When oil enters through the first oil hole 12, some hydraulic oil enters the first flow channel 22. When the oil pressure of the pilot oil flowing into the first flow channel 22 on the pilot valve core 31 is greater than the elastic force of the first spring 32, the pilot valve core 31 moves to the left along the axial direction of the valve body 1, allowing the pilot oil to flow from the first flow channel 22 through the mounting cavity 21 and then out through the third oil hole 23, and then back to the oil tank through the second oil hole 13. In this way, the oil pressure in the upper valve chamber 11 decreases. When the pressure difference between the oil pressure acting on the second valve core 82 and the oil pressure in the upper valve chamber 11 is greater than the first oil hole 12, the pilot oil flows to the left. When the spring 83 is in its elastic force, the second valve core 82 moves to the left, opening the fourth oil hole 811. Some oil can then flow from the first oil hole 12 into the fourth oil hole 811 and finally out through the second oil hole 13. It should be noted that when the second valve core 82 moves to the left, its right side no longer abuts against the valve sleeve 81. Under the pressure difference, the valve sleeve 81 also moves to the left, directly connecting the first oil hole 12 and the second oil hole 13. The oil flowing into the first oil hole 12 flows out through the second oil hole 13, thus achieving the overflow function.

[0093] It is understandable that although the valve sleeve 81 moves to the left slightly later than the second valve core 82, under the drive of oil pressure, the valve sleeve 81 always moves to the left following the second valve core 82. Therefore, it can be approximately regarded that the valve sleeve 81 and the second valve core 82 move to the left synchronously.

[0094] Furthermore, when oil enters the second oil hole 13, the hydraulic oil in the second oil hole 13 drives the valve sleeve 81 to move to the left, thereby connecting the first oil hole 12 with the second oil hole 13. The oil flowing into the second oil hole 13 flows out from the first oil hole 12, thus realizing the oil replenishment function.

[0095] In some embodiments of this application, such as Figure 1 and Figure 4As shown, the first valve core 41 has a second damping flow channel 411, which includes an oil inlet 4111 and an oil outlet 4112. The oil inlet 4111 is located on the side wall of the first valve core 41, and the oil outlet 4112 communicates with the first flow channel 22. The second valve core 82 has a guide hole, and the first valve core 41 is movably located in the guide hole. The inner wall of the guide hole is adapted to open the oil inlet 4111 so that the oil inlet 4111 communicates with the first oil hole 12, or to block the oil inlet 4111 so that the oil inlet 4111 is isolated from the first oil hole 12.

[0096] Specifically, such as Figure 1 As shown, in the initial state, the first valve core 41 is located at the right limit position under the elastic force of the second spring 42. The inner wall of the guide hole is adapted to open the oil inlet hole 4111 so that the oil inlet hole 4111 is connected with the first oil hole 12. The second valve core 82 and the valve sleeve 81 are located at the right limit position under the elastic force of the third spring 83. At this time, the valve sleeve 81 isolates the first oil hole 12 from the second oil hole 13.

[0097] When oil enters the first oil hole 12, some hydraulic oil enters the first flow channel 22 through the second damping flow channel 411. As the oil pressure of the oil flowing into the first oil hole increases, the first valve core 41 moves to the left against the elastic force of the second spring 42. At the same time, the oil pressure of the pilot oil flowing into the first flow channel 22 also gradually increases. When the oil pressure of the pilot oil acting on the pilot valve core 31 is greater than the elastic force of the first spring 32, the pilot valve core 31 moves to the left. The pilot oil can flow from the first flow channel 22 through the mounting cavity 21 and then out through the third oil hole 23, and then flow back to the oil tank through the second oil hole 13. In this way, the oil pressure in the upper valve cavity 11 decreases. When the pressure difference between the oil pressure acting on the second valve core 82 and the oil pressure in the upper valve cavity 11 is greater than the elastic force of the third spring 83, the valve sleeve 81 moves to the left with the second valve core 82, so that the first oil hole 12 and the second oil hole 13 are directly connected.

[0098] It should be noted that as the oil pressure of the oil flowing into the first oil port continues to increase, the first valve core 41 moves into the guide hole and uses the guide hole to block the oil inlet hole 4111 on the side wall of the first valve core 41, so that the oil inlet hole 4111 is isolated from the first oil hole 12. At this time, the guide flow assembly is no longer supplied with pilot oil. As the oil in the upper valve chamber 11 continues to flow into the second oil hole 13, when the pressure difference on both sides of the pilot valve core 31 is less than the elastic force of the first spring 32, the pilot valve core 31 moves to the right and blocks the first flow channel 22, but does not affect the connection between the first oil hole 12 and the second oil hole 13.

[0099] With this configuration, the isolation or connection between the first oil hole 12 and the first flow channel 22 can be controlled by blocking or opening the oil inlet hole 4111 through the inner wall of the guide hole. The structure is simple and reliable.

[0100] In some embodiments of this application, such as Figure 1As shown, the pilot-operated overflow replenishing valve 100 also includes an adjusting rod 9. Along the axial direction of the valve body 1, a spring seat 7 is abutted and installed between the adjusting rod 9 and the first spring 32. The adjusting rod 9 is adapted to adjust the elastic force of the first spring 32.

[0101] Specifically, one end of the adjusting rod 9 abuts against the spring seat 7, the adjusting rod 9 extends out of the mounting cavity 21 and is threadedly connected to the external adjusting nut 10. By adjusting the screw rod 9, the fixed position of the spring seat 7 can be adjusted, thereby adjusting the elastic force of the first spring 32. That is, the elastic force of the first spring 32 that the oil needs to overcome to push the pilot valve core 31 can be changed. In other words, the opening pressure of the pilot overflow oil replenishment valve 100 can be adjusted.

[0102] The piping system according to a second aspect of this application includes the pilot-operated overflow replenishment valve 100 of the first aspect embodiment.

[0103] According to the pipeline system proposed in the embodiments of this application, by setting the above-mentioned pilot-operated overflow oil replenishment valve 100, the inner wall of the first flow channel 22 of the valve seat 2 is provided with an internal thread 2221, and the outer wall of the filter screen seat 6 is provided with an external thread 61. When the filter screen 5 is installed into the first flow channel 22, the filter screen 5 is restricted in the first flow channel 22 by the thread fixation between the external thread 61 and the internal thread 2221. This setting simplifies the assembly process, only requires threaded installation, improves assembly efficiency, and at the same time, there is no need to use a wire retaining ring for limiting, reducing assembly parts and helping to save assembly time and cost. Compared with interference fit assembly, threaded installation has lower requirements for machining accuracy and is simpler to process.

[0104] It should also be noted that 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 a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0105] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0106] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

[0107] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A pilot-operated overflow replenishing valve, characterized in that, include: The valve body (1) has a valve cavity (11), a first oil hole (12), and a second oil hole (13); A valve seat (2) is arranged opposite to and spaced apart from the first oil hole (12) along the axial direction of the valve body (1). At least a portion of the valve seat (2) is fixedly installed in the valve cavity (11). The valve seat (2) has an installation cavity (21), a first flow channel (22) and a third oil hole (23). The first flow channel (22) is selectively connected to or disconnected from the first oil hole (12). The third oil hole (23) is connected to the second oil hole (13). A pilot component (3) is movably disposed in the mounting cavity (21) so that the first flow channel (22) is connected to or disconnected from the third oil hole (23); The pilot-operated overflow oil replenishment valve (100) further includes a filter screen (5) and a filter screen seat (6). The inner wall of the first flow channel (22) is provided with an internal thread (2221), and the outer wall of the filter screen seat (6) is provided with an external thread (61). The external thread (61) is threadedly connected to the internal thread (2221) so that the filter screen seat (6) is fixedly installed in the first flow channel (22). The filter screen (5) is disposed in the first flow channel (22) and along the axial direction of the valve body (1). The filter screen (5) is located on the side of the filter screen seat (6) away from the first oil hole (12). The filter screen seat (6) is provided with a first through hole (62).

2. The pilot-operated overflow replenishing valve according to claim 1, characterized in that, Along the axial direction of the valve body (1), the first flow channel (22) includes a first section (221) and a second section (222) connected in sequence. The first section (221) is farther away from the first oil hole (12) than the second section (222). The inner diameter of the first section (221) is smaller than the inner diameter of the second section (222) to form a first limiting part (223). The inner wall of the second segment (222) has the internal thread (2221), the filter seat (6) is fixedly installed in the second segment (222), and the filter (5) is disposed between the first limiting part (223) and the filter seat (6) along the axial direction of the valve body (1).

3. The pilot-operated overflow replenishing valve according to claim 1, characterized in that, The pilot-operated overflow oil replenishment valve (100) also includes a spring seat (7), which is fixedly installed in the mounting cavity (21). The mounting cavity (21) is connected to the first flow channel (22) and the third oil hole (23). The pilot assembly (3) includes a pilot valve core (31) and a first spring (32). Along the axial direction of the valve body (1), the first spring (32) is abutted between the spring seat (7) and the pilot valve core (31), and the pilot valve core (31) is movably disposed between the spring seat (7) and the first flow channel (22) so that the pilot valve core (31) blocks or opens the first flow channel (22).

4. The pilot-operated overflow replenishing valve according to claim 3, characterized in that, The valve seat (2) has a first damping flow channel (24), and the mounting cavity (21) is connected to the first flow channel (22) through the first damping flow channel (24). The inner diameter of the first damping flow channel (24) is smaller than the inner diameter of the first flow channel (22). Along the axial direction of the valve body (1), the pilot valve core (31) is movably disposed in the mounting cavity (21) to block or open the first damping flow channel (24).

5. The pilot-operated overflow replenishing valve according to claim 1, characterized in that, The pilot-operated overflow oil replenishment valve (100) further includes a first valve core assembly (4) and a second valve core assembly (8). Along the axial direction of the valve body (1), a portion of the second valve core assembly (8) is disposed between the first flow channel (22) and the first oil hole (12). The second valve core assembly (8) is slidably fitted on the outer peripheral surface of the valve seat (2), and the second valve core assembly (8) is movably disposed in the valve cavity (11) so that the first oil hole (12) and the second oil hole (13) are connected or disconnected. A portion of the first valve core assembly (4) is movably disposed on the second valve core assembly (8) so that the first flow channel (22) communicates with or is isolated from the first oil hole (12).

6. The pilot-operated overflow replenishing valve according to claim 5, characterized in that, The first valve core assembly (4) includes a first valve core (41) and a second spring (42). Along the axial direction of the valve body (1), the second spring (42) is abutted between the filter seat (6) and the first valve core (41), and the first valve core (41) is movable relative to the second valve core assembly (8) so that the first flow channel (22) communicates with or is disconnected from the first oil hole (12).

7. The pilot-operated overflow replenishing valve according to claim 6, characterized in that, The second valve core assembly (8) includes a valve sleeve (81), a second valve core (82) and a third spring (83). The valve sleeve (81) is disposed in the valve cavity (11). A portion of the valve sleeve (81) is slidably fitted onto the outer peripheral surface of the valve seat (2). The valve sleeve (81) has a fourth oil hole (811) which communicates with the second oil hole (13). The second valve core (82) and the third spring (83) are both located inside the valve sleeve (81). Along the axial direction of the valve body (1), the third spring (83) is abutted between the valve seat (2) and the second valve core (82), and the second valve core (82) is movable relative to the valve sleeve (81) so that the fourth oil hole (811) is connected to or disconnected from the first oil hole (12). Along the axial direction of the valve body (1), a portion of the valve sleeve (81) is disposed between the second valve core (82) and the valve body (1), and the valve sleeve (81) is movably disposed in the valve cavity (11) so that the first oil hole (12) communicates with or is isolated from the second oil hole (13).

8. The pilot-operated overflow replenishing valve according to claim 7, characterized in that, The first valve core (41) has a second damping flow channel (411), the second damping flow channel (411) includes an oil inlet (4111) and an oil outlet (4112), the oil inlet (4111) is located on the side wall of the first valve core (41), and the oil outlet (4112) communicates with the first flow channel (22); The second valve core (82) has a guide hole, and the first valve core (41) is movably disposed in the guide hole. The inner wall of the guide hole is adapted to open the oil inlet hole (4111) to make the oil inlet hole (4111) communicate with the first oil hole (12), or to block the oil inlet hole (4111) to isolate the oil inlet hole (4111) from the first oil hole (12).

9. The pilot-operated overflow replenishing valve according to claim 3, characterized in that, The pilot-operated overflow replenishing valve (100) also includes an adjusting rod (9). Along the axial direction of the valve body (1), the spring seat (7) is abutted between the adjusting rod (9) and the first spring (32). The adjusting rod (9) is adapted to adjust the elastic force of the first spring (32).

10. A piping system, characterized in that, Includes the pilot-operated overflow replenishing valve (100) as described in any one of claims 1-9.

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