Valve assembly, flow amplifier and fluid device

Abstract

This utility model belongs to the field of fluid control, specifically relating to a valve assembly, including: an internal component; and an assembly component. The internal component is disposed radially inside the assembly component. The assembly component includes a first end and a second end along the axial direction. The assembly component includes a cover portion at the first end. The internal component and the cover portion constitute a direct-acting anti-cavitation overflow valve, which defines a first region communicating with a servo-side channel and a second region communicating with a tank-side channel. The first region is closer to the cover portion than the second region. The assembly component includes a first external through-hole communicating with the first region and a second external through-hole communicating with the second region. The first external through-hole is closer to the first end than the second external through-hole. The valve assembly is configured to be installed in a fluid device along a direction from the second end to the first end. The valve assembly according to this utility model has a fast response and low cost. This utility model also relates to a flow amplifier and a fluid device.

Description

Technical Field

[0001] This utility model belongs to the field of fluid control, specifically relating to a valve assembly, a flow amplifier, and a fluid device. Background Technology

[0002] In some applications of fluid control, valves are used to control the flow of fluids. Some valves are used to ensure the normal operation of related fluid equipment. For example, relief valves are used to limit the fluid pressure in equipment to prevent system overload. Anti-cavitation valves are used to prevent cavitation in fluid channels, which can cause noise and damage to parts.

[0003] In some fluid equipment, a combined valve structure is used to perform multiple functions through a single component or product. For example, some fluid amplifiers used for steering functions have two pilot-operated anti-cavitation relief valves, which respectively provide pressure control and anti-cavitation effects in the fluid passages leading to the cylinder for left steering control and the cylinder for right steering control.

[0004] However, the internal structure of pilot-operated anti-cavitation relief valves is relatively complex, their response to corresponding situations is slow, and fluid equipment equipped with pilot-operated anti-cavitation relief valves is expensive. On the other hand, the current structures of pilot-operated anti-cavitation relief valves and corresponding fluid equipment are already designed to be compatible and very compact, making it difficult to make further structural improvements to pilot-operated anti-cavitation relief valves or fluid equipment.

[0005] Therefore, there is a need for a technical solution that can at least address some of the aforementioned problems. Utility Model Content

[0006] To address the above problems, according to a first aspect of this utility model, a valve assembly for a fluid device is proposed. The valve assembly includes: an internal component defining an axial direction; and an assembly component, the internal component being disposed radially inside the assembly component. The assembly component includes a first end and a second end opposite to the first end along the axial direction. The assembly component includes a cover portion at the first end. The internal component and the cover portion constitute a direct-acting anti-cavitation overflow valve. The direct-acting anti-cavitation overflow valve defines a first region configured to fluidly communicate with a servo-side channel of the fluid device and a second region configured to fluidly communicate with a tank-side channel of the fluid device. The first region is closer to the cover portion in the axial direction relative to the second region, wherein the assembly includes at least one first external through-hole and at least one second external through-hole, the first external through-hole being in fluid communication with the first region and open on the outer surface of the assembly, the second external through-hole being in fluid communication with the second region and open on the outer surface of the assembly, the first external through-hole being closer to a first end of the assembly in the axial direction relative to the second external through-hole, wherein the external shape of the assembly is configured such that the valve assembly is adapted to be installed into the fluid device in a direction from the second end to the first end.

[0007] According to a first aspect of the present invention, the valve assembly has a direct-acting anti-cavitation overflow valve structure internally. The valve assembly is configured such that a first region and a first external through-hole in fluid communication with the servo side are closer to the first end, and a second region and a second external through-hole in fluid communication with the tank side are closer to the second end. Furthermore, the external shape of the assembly is configured such that the valve assembly is suitable for installation into a fluid device along a direction from the second end to the first end. Thus, the valve assembly according to the first aspect of the present invention can be installed into the body of a fluid device (e.g., a flow amplifier) ​​configured with a pilot-operated anti-cavitation overflow valve without modifying the main structure of the fluid device. Since the direct-acting anti-cavitation overflow valve responds faster to corresponding situations and has a simpler structure and lower manufacturing cost compared to the pilot-operated anti-cavitation overflow valve, according to the first aspect of the present invention, the valve assembly can be installed into the body of a fluid device configured with a pilot-operated anti-cavitation overflow valve, thereby manufacturing a faster-responding fluid device at a lower cost.

[0008] The valve assembly according to this utility model may have one or more of the following features, individually or in combination.

[0009] According to one embodiment, preferably, the radial external dimension of the assembly decreases or remains substantially constant in the axial direction from the second end to the first end. The valve assembly according to this embodiment has a relatively simple external shape and can be adapted to a variety of fluid devices.

[0010] According to one embodiment, preferably, the assembly includes a sleeve extending longitudinally along an axial direction, the sleeve defining a radially outer portion of the assembly in at least a portion of its axial extension. The valve assembly according to this embodiment has a robust external structure, simplifying the installation process into fluid equipment.

[0011] According to one embodiment, preferably, the internal component is disposed radially inside the sleeve, the sleeve including an axial end portion located at a first end of the assembly, the axial end portion defining the cover portion, and the first external through-hole and the second external through-hole are disposed on the sleeve. The valve assembly according to this embodiment has a fewer number of parts and lower manufacturing costs.

[0012] According to one embodiment, preferably, the assembly further includes a first valve seat fixed radially inside the sleeve, and the internal component is arranged between the first valve seat and the cover portion. The valve assembly according to this embodiment has a relatively simple assembly process.

[0013] According to one embodiment, preferably, the assembly includes a tubular member disposed radially inside the sleeve, the internal assembly being disposed radially inside the tubular member, the tubular member including an axial end portion located at a first end of the assembly, the axial end portion defining the cover portion, a first external through-hole being disposed on the tubular member, and a second external through-hole being disposed on the sleeve. The valve assembly according to this embodiment has a relatively simple assembly process, and furthermore, it allows for the specific dimensions of the tubular member to be set according to the required specifications of the direct-acting anti-cavitation overflow valve.

[0014] According to one embodiment, preferably, the sleeve is provided with at least one first anti-cavitation through-hole and at least one second anti-cavitation through-hole. A fluid channel connecting the first and second anti-cavitation through-holes is defined between the radially outer surface of the tubular member and the radially inner surface of the sleeve. The tubular member is axially movable to open or close the fluid channel. The assembly is configured such that, when the fluid pressure in the second region does not exceed the tank-side pressure, the tubular member closes the fluid channel; and when the fluid pressure in the second region exceeds the tank-side pressure, the tubular member moves in a direction from the second end to the first end to open the fluid channel. The valve assembly according to this embodiment has improved anti-cavitation performance.

[0015] According to one embodiment, preferably, the second anti-cavitation through-hole is closer to the first end of the assembly along the axial direction relative to the second external through-hole. The valve assembly according to this embodiment has a further improved anti-cavitation effect.

[0016] According to one embodiment, preferably, the assembly includes an anti-cavitation spring configured to bias the tubular member in a direction from the first end to the second end.

[0017] According to one embodiment, preferably, the anti-cavitation spring is a helical spring wound around the radially outer surface of the tubular member and located between the radially outer surface of the tubular member and the radially inner surface of the sleeve. The valve assembly according to this embodiment has improved anti-cavitation performance, and the anti-cavitation function operates more stably.

[0018] According to one embodiment, preferably, the anti-cavitation spring is a helical spring, which is disposed axially on the outer side of the axial end of the tubular member. The valve assembly according to this embodiment has improved anti-cavitation performance, simple component structure, and allows for larger tolerances.

[0019] According to one embodiment, preferably, the fluid device is a flow amplifier, the first external through-hole on the outer surface of the assembly opens to a servo-side channel of the flow amplifier, and the second external through-hole on the outer surface of the assembly opens to a tank-side channel of the flow amplifier.

[0020] According to a second aspect of the present invention, a flow amplifier is provided, the flow amplifier comprising one or more of the aforementioned valve assemblies.

[0021] The fluid amplifier according to the second aspect of this invention has the corresponding advantages brought by the aforementioned valve assembly.

[0022] According to a third aspect of the present invention, a fluid device is provided, the fluid device comprising one or more of the aforementioned valve assemblies.

[0023] The fluid device according to the third aspect of this utility model has the corresponding advantages brought by the aforementioned valve assembly. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments of this utility model will be briefly described below. The drawings are merely illustrative of some embodiments of this utility model and are not intended to limit the scope of all embodiments of this utility model.

[0025] Figure 1AThis is a cross-sectional view of an example flow amplifier equipped with a pilot-operated anti-cavitation overflow valve.

[0026] Figure 1B This is a cross-sectional view of the internal components of the valve assembly according to an embodiment of the present invention.

[0027] Figure 2A This is a cross-sectional view of the valve assembly according to the first embodiment of the present invention.

[0028] Figure 2B This is a partial cross-sectional view of a flow amplifier equipped with a valve assembly according to the first embodiment of the present invention.

[0029] Figure 3A This is a cross-sectional view of the valve assembly according to the second embodiment of the present invention.

[0030] Figure 3B This is a partial cross-sectional view of a flow amplifier equipped with a valve assembly according to the second embodiment of the present invention.

[0031] Figure 3C This is another cross-sectional view of a flow amplifier equipped with a valve assembly according to the second embodiment of the present invention.

[0032] Figure 4A This is a cross-sectional view of the valve assembly according to the third embodiment of the present invention.

[0033] Figure 4B This is a partial cross-sectional view of a flow amplifier equipped with a valve assembly according to the third embodiment of the present invention.

[0034] List of reference numerals

[0035] 1 Flow Amplifier

[0036] 10-valve assembly

[0037] 11 Direct-acting anti-cavitation overflow valve

[0038] 100 internal components

[0039] 101 First District

[0040] 102 Second Area

[0041] 110 Internal valve seat

[0042] 111 The first part of the internal valve seat

[0043] 112 The second part of the internal valve seat

[0044] 115 The center through hole of the internal valve seat

[0045] 120 strokes

[0046] The first end of rod 121

[0047] The second end of rod 122

[0048] 130 First Spring

[0049] 140 Second Spring

[0050] 200 Assembly Components

[0051] 201 First end of assembly component

[0052] 202 The second end of the assembly component

[0053] 211 Cover section

[0054] 220 sleeve

[0055] 221 First external through hole

[0056] 222 Second external through hole

[0057] 227 Axial end of sleeve

[0058] 229 The radial inner surface of the sleeve

[0059] 230 Tubular components

[0060] 233 Tubular component main body

[0061] 234 Second valve seat

[0062] 235 Center through hole of the second valve seat

[0063] 237 Axial end of tubular component

[0064] 238 Radial outer surface of tubular member

[0065] 240 First valve seat

[0066] 245 The center through hole of the first valve seat

[0067] 250 fluid channels

[0068] 260 Anti-cavitation Spring

[0069] 261 First anti-cavitation through hole

[0070] 262 Second anti-cavitation through hole

[0071] 81 Pump Channel

[0072] 82 fuel tank side passage

[0073] 83 First Servo-Side Channel

[0074] 84 Second Servo-Side Channel

[0075] 85 First Drive Mechanism

[0076] 86 Second Drive Mechanism

[0077] 87 valve core

[0078] 90 intermediate components

[0079] 91 First side component

[0080] 92 Second side component

[0081] 93 Pilot-operated anti-cavitation overflow valve

[0082] Axis A

[0083] L-axis direction

[0084] C Center Plane Detailed Implementation

[0085] To make the objectives, technical solutions, and advantages 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. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0086] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, “an” or “a” and similar terms do not necessarily indicate a quantity limitation. Terms such as “comprising” or “including” indicate that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to direct connections but may include indirect connections. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0087] The present invention will be described in detail below by way of example embodiments.

[0088] Figure 1A A cross-sectional view of an example flow amplifier equipped with a pilot-operated anti-cavitation overflow valve is shown. This cross-sectional view shows the valve core 87 of the flow amplifier, which is configured to move within a valve orifice driven by a first drive mechanism 85 and a second drive mechanism 86, thereby controlling the flow relationship between the pump passage 81, the tank-side passage 82, the first servo-side passage 83, and the second servo-side passage 84. Figure 1A In this configuration, the first servo-side channel 83 can be fluidly connected to the first side of the hydraulic cylinder (not shown), and the second servo-side channel 84 can be fluidly connected to the second side of the hydraulic cylinder (not shown). Thus, Figure 1A The flow amplifier shown can amplify flow, but its specific working mechanism is not described in detail here.

[0089] Figure 1A The flow amplifier shown is equipped with two pilot-operated anti-cavitation overflow valves 93. These two pilot-operated anti-cavitation overflow valves 93 are arranged substantially symmetrically with respect to the central plane C, and each pilot-operated anti-cavitation overflow valve 93 is respectively arranged in a corresponding valve receiving section of the flow amplifier. Figure 1A In this configuration, one valve receiving unit is connected between the oil tank side channel 82 and the first servo side channel 83, and the other valve receiving unit is connected between the oil tank side channel 82 and the second servo side channel 84.

[0090] Figure 1A The flow amplifier shown includes an intermediate component 90 defining the aforementioned fluid channels, and a first side component 91 and a second side component 92 respectively fixed to the intermediate component 90 from both sides. During assembly of the flow amplifier, located at... Figure 1A The pilot-operated anti-cavitation overflow valve 93 on the left side moves from the left side of the middle component 90 along axis A to the right and enters the corresponding valve receiving section, located in... Figure 1A The pilot-operated anti-cavitation overflow valve 93 on the right side moves from the right side of the intermediate component 90 along axis A to the left into the corresponding valve receiving section, while the first side component 91 and the second side component 92 are fixed to the intermediate component 90 after the two pilot-operated anti-cavitation overflow valves 93 are installed into the corresponding valve receiving sections. Figure 1A As can be seen, the internal structure of the intermediate component 90 of the flow amplifier is configured to match the shape and installation path of the pilot-operated anti-cavitation overflow valve 93.

[0091] For example, located in Figure 1A The radial outer dimension of the pilot-operated anti-cavitation overflow valve 93 on the left side is from the outside of the middle component 90 ( Figure 1A The direction from the left side of the center plane (towards the central plane C) along axis A decreases or remains essentially unchanged. Correspondingly, the direction located on the left side of the center plane (towards the central plane C) decreases or remains essentially unchanged along axis A. Figure 1AThe radial internal dimension of the valve receiving section on the left side decreases or remains substantially constant along axis A in the direction from the outside of the intermediate member 90 to the central plane C. Therefore, the pilot-operated anti-cavitation relief valve 93 can be inserted into and installed into the valve receiving section from the outside of the intermediate member 90 simply by movement. Here, the decrease or substantial constant radial dimension of the pilot-operated anti-cavitation relief valve 93 or the valve receiving section can include cases where the radial external dimension of the pilot-operated anti-cavitation relief valve 93 and the radial internal dimension of the valve receiving section along axis A decrease or remain substantially constant in sections. For example, if the valve receiving section is shaped like multiple cylinders arranged axially along axis A, the radial internal dimension of the valve receiving section is the corresponding diameter of the multiple cylinders.

[0092] Figure 1B A cross-sectional view of the internal component 100 of the valve assembly 10 according to an embodiment of the present invention is shown. The internal component 100 forms part of a direct-acting anti-cavitation overflow valve. Figure 1B As shown, the internal assembly includes an internal valve seat 110, a rod 120, a first spring 130, and a second spring 140. The internal valve seat 110 includes a central through-hole 115, through which the rod 120 movably passes, and a first end 121 and a second end 122 of the rod 120 are located on opposite sides of the internal valve seat 110. Figure 1B As shown, the internal valve seat 110 may include a first portion 111 and a second portion 112 arranged along the extension direction of the rod 120. When the internal assembly 100 is mounted in its respective receiving portion, the first portion 111 and the second portion 112 are fixed to each other; however, the first portion 111 and the second portion 112 may be separable from each other to facilitate the manufacture of the parts. In other embodiments, the first portion 111 and the second portion 112 may also be formed as an integral component.

[0093] like Figure 1B As shown, the first spring 130 is disposed between the second end 122 of the rod and the internal valve seat 110. Figure 1B In this configuration, the first spring 130 is configured to bias the rod 120 to the right, causing the first end 121 of the rod to abut against the left side of the central through-hole 115, thereby fluidly sealing the central through-hole 115. The second spring 140 is disposed on the side of the second end 122 of the rod away from the internal valve seat 110. Figure 1B In this configuration, the second spring 140, via the second end 122 of the rod and the first spring 130, biases the internal valve seat 110 to the left, causing the internal valve seat 110 to abut against the right side portion of a through-hole (not shown), thereby fluidly closing the through-hole. With a cover component provided at the end of the second spring 140 away from the rod 120, the internal assembly 100 and the cover component can form a direct-acting anti-cavitation overflow valve. Accordingly, the internal assembly 100 can define an axial direction L, such as... Figure 1B As shown.

[0094] When the internal component 100 is installed in the corresponding housing to form a direct-acting anti-cavitation overflow valve, the area near the first spring 130 is configured to be in fluid communication with the servo side of the fluid device (e.g., connected to a hydraulic cylinder), and the area near the internal valve seat 110 away from the direction of the second spring 140 (i.e., Figure 1B A portion of the left side region of the internal valve seat 110 is configured to be in fluid communication with the tank side of the fluid device. According to the present invention, the direct-acting anti-cavitation overflow valve defines a first region 101 in fluid communication with the servo-side channel of the fluid device and a second region 102 in fluid communication with the tank-side channel of the fluid device. Figure 1B The first region 101 and the second region 102 are schematically shown in the diagram.

[0095] Figure 2A A cross-sectional view of the valve assembly 10 according to a first embodiment of the present invention is shown. Figure 2A As shown, the valve assembly 10 includes Figure 1B The internal component 100 shown also includes an assembly component 200, which is disposed radially inside the assembly component 200. Specifically, the assembly component 200 includes a sleeve 220 extending longitudinally along an axial direction L, which defines a radially outer portion of the assembly component 200 within its axial extension range, and the internal component 100 is disposed radially inside the sleeve 220.

[0096] exist Figure 2A In the assembly assembly 200, a first end 201 and a second end 202 opposite to the first end 201 are included in the axial direction. The assembly assembly 200 includes a cover portion 211 at the first end 201. Specifically, the sleeve 220 includes an axial end 227 located at the first end 201 of the assembly assembly 200, which defines the cover portion 211. The cover portion 211 is located at the end of the second spring 140 remote from the rod 120, so that this end of the second spring 140 can be compressed against the cover portion 211. Thus, the inner assembly 100 and the cover portion 211 constitute a direct-acting anti-cavitation overflow valve 11. Figure 2A Specifically, the first region 101 and the second region 102 of the direct-acting anti-cavitation overflow valve are shown, as follows: Figure 2A As shown, the first region 101 is closer to the cover portion 211 than the second region 102.

[0097] Figure 2AA first valve seat 240 of the assembly 200 is also shown. The first valve seat 240 is fixed radially inside the sleeve 220 and includes a central through-hole 245 extending in the axial direction L. An inner assembly 100 is disposed between the first valve seat 240 and the cover portion 211. An inner valve seat 110 of the inner assembly 100 is capable of abutting against the first valve seat 240 to close the central through-hole 245.

[0098] Continue to refer to Figure 2A The sleeve 220 is provided with a plurality of first external through holes 221 and a plurality of second external through holes 222. The first external through holes 221 are in fluid communication with the first region 101 and are open on the outer surface of the sleeve 220, i.e., open on the outer surface of the assembly 200. The second external through holes 222 are in fluid communication with the second region 102 and are open on the outer surface of the sleeve 220, i.e., open on the outer surface of the assembly 200. Figure 2A As shown, the first external through hole 221 is closer to the first end 201 of the assembly 200 in the axial direction L than the second external through hole 222. It should be noted that, according to the present invention, there is no limitation on the specific number of the first external through hole 221 and the second external through hole 222.

[0099] Figure 2B A partial cross-sectional view of the flow amplifier is shown, in which, Figure 2A The valve assembly 10 shown is installed in a valve receiver configured to receive a pilot-operated anti-cavitation overflow valve. From Figure 2B As can be seen, the first external through hole 221 connects the first region 101 to the servo-side channel (e.g., the first servo-side channel 83), and the second external through hole 222 connects the second region 102 to the tank-side channel 82.

[0100] When the fluid pressure in the servo-side channel 83 is not greater than the servo-side pressure threshold, the rod 120, under the action of the first spring 130, abuts against and closes the central through hole 115 on the internal valve seat 110. When the fluid pressure in the servo-side channel 83 is greater than the servo-side pressure threshold, the fluid-driven rod 120 in the first region 101 moves to the left to open the central through hole 115 on the internal valve seat 110, and fluid communication is established between the first region 101 and the second region 102 until the fluid pressure in the servo-side channel 83 is no longer greater than the servo-side pressure threshold. Furthermore, when the fluid pressure in the tank-side channel 82 is not greater than the tank-side pressure, the internal valve seat 110, under the action of the second spring 140, abuts against and closes the central through hole 245 on the first valve seat 240. When the fluid pressure in the tank-side passage 82 is greater than the tank-side pressure, the fluid in the second region 102 pushes the internal valve seat 110 to the right to open the central through hole 245 on the first valve seat 240, and the second region 102 and the first region 101 are in fluid communication until the fluid pressure in the tank-side passage 82 is no longer greater than the tank-side pressure.

[0101] According to this invention, the external shape of the assembly 200 is configured such that the valve assembly 10 is adapted to be installed into a fluid device in a direction pointing from the second end 202 to the first end 201. For example, as Figure 2A and Figure 2B As shown in the embodiments, the radial external dimension of the assembly 200 decreases or remains substantially constant along the axial direction L from the second end 202 to the first end 201. Therefore, the valve assembly 10 can be loaded into the corresponding valve receiving section of a fluid device, for example, into the valve receiving section of an intermediate component 90 of a flow amplifier, in the axial direction L from the second end 202 to the first end 201, without requiring modifications to the internal structure of the existing intermediate component 90.

[0102] Here, the decrease or substantially constant radial external dimension of assembly 200 along the axial direction L corresponds to a situation where the radial external dimension of assembly 200 decreases or substantially remains constant segmentally along the axial direction L. Here, a substantially constant radial external dimension corresponds to a situation where the radial external dimension of assembly 200 may have very small variations along the axial direction, for example due to tolerances or the installation of O-rings, while the valve assembly 10 can still be installed into the fluid device by moving along the direction from the second end 202 to the first end 201.

[0103] Figure 3A A cross-sectional view of the valve assembly 10 according to a second embodiment of the present invention is shown. Figure 3A As shown, the valve assembly 10 includes Figure 1B The internal assembly 100 shown also includes an assembly assembly 200, the internal assembly 100 being disposed radially inside the assembly assembly 200. Specifically, the assembly assembly 200 includes a sleeve 220 extending longitudinally along an axial direction L and a tubular member 230 disposed radially inside the sleeve 220, the internal assembly 100 being disposed radially inside the tubular member 230. The sleeve 220 defines a radially outer portion of the assembly assembly 200 within a portion of its axial extension.

[0104] exist Figure 3AIn the assembly 200, the assembly 200 includes a first end 201 and a second end 202 opposite to the first end 201 in the axial direction. The assembly 200 includes a cover portion 211 at the first end 201. Specifically, the tubular member 230 includes a tubular axial end 237 located at the first end 201 of the assembly 200, which defines the cover portion 211. The cover portion 211 is located at the end of the second spring 140 away from the rod 120, so that this end of the second spring 140 can be compressed against the cover portion 211. Thus, the inner assembly 100 and the cover portion 211 constitute a direct-acting anti-cavitation overflow valve 11. Figure 3A Specifically, a first region 101 and a second region 102 of a direct-acting anti-cavitation overflow valve are shown, with the first region 101 being closer to the cover portion 211 than the second region 102.

[0105] like Figure 3A As shown, the tubular member 230 has a plurality of first external through holes 221, and the sleeve 220 has a plurality of second external through holes 222. Specifically, the tubular member body 233 and the second valve seat 234 are assembled together to form the tubular member 230. The plurality of first external through holes 221 are provided on the tubular member body 233. The second valve seat 234 includes a central through hole 235 extending in the axial direction L. The internal valve seat 110 of the internal assembly 100 can abut against the second valve seat 234 to close the central through hole 235. The first external through holes 221 are in fluid communication with the first region 101 and are open on the outer surface of the assembly 200. The second external through holes 222 are in fluid communication with the second region 102 via the second valve seat 234 and are open on the outer surface of the sleeve 220, i.e., open on the outer surface of the assembly 200. Figure 3A As shown, the first external through hole 221 is closer to the first end 201 of the assembly 200 in the axial direction L than the second external through hole 222. It should be noted that, according to the present invention, there is no limitation on the specific number of the first external through hole 221 and the second external through hole 222.

[0106] Continue to refer to Figure 3A The sleeve 220 is provided with a first anti-cavitation through hole 261 and a second anti-cavitation through hole 262. A fluid channel 250 is defined between the radial outer surface 238 of the tubular member 230 and the radial inner surface of the sleeve 220. This fluid channel 250 connects the first anti-cavitation through hole 261 and the second anti-cavitation through hole 262. For example, as Figure 3AAs shown, the axial end portion of the sleeve 220 extends along the axial direction L to form a first anti-cavitation through hole 261. A second anti-cavitation through hole 262 is located along the axial direction L between the first anti-cavitation through hole 261 and the second external through hole 222. In other words, the second anti-cavitation through hole 262 is closer to the first end 201 of the assembly 200 along the axial direction L than the second external through hole 222. According to this invention, when the valve assembly 10 is installed in a fluid device, the first anti-cavitation through hole 261 is configured to be in fluid communication with the servo side of the fluid device, and the second anti-cavitation through hole 262 is configured to be in communication with the tank side of the fluid device.

[0107] According to this invention, the tubular member 230 is movable within the sleeve 220 in the axial direction L to open or close the fluid passage 250. When the fluid passage 250 is closed (see...), Figure 3A and Figure 3B The servo side of the fluid device and the tank side of the fluid device are not connected via fluid channel 250. When fluid channel 250 is open (see...), Figure 3C The servo side of the fluid device and the tank side of the fluid device are connected via fluid channel 250.

[0108] Continue to refer to Figure 3A The assembly 200 also includes an anti-cavitation spring 260. The anti-cavitation spring 260 is a helical spring wound around the radially outer surface 238 of the tubular member 230. The anti-cavitation spring 260 is located between the radially outer surface 238 of the tubular member and the radially inner surface 229 of the sleeve to apply opposing axial forces to the tubular member 230 and the sleeve 220. Specifically, the anti-cavitation spring 260 biases the tubular member 230 in a direction from the first end 201 to the second end 202 to cause the tubular member 230 to close the fluid passage 250.

[0109] Figure 3B and Figure 3C Partial cross-sectional views of the flow amplifier are shown, in which, Figure 3A The valve assembly 10 shown is installed in a valve receiver configured to receive a pilot-operated anti-cavitation overflow valve. From Figure 3B As can be seen, the first external through-hole 221 connects the first region 101 to the servo-side channel (e.g., the second servo-side channel 84), and the second external through-hole 222 connects the second region 102 to the tank-side channel 82. In addition, the first anti-cavitation through-hole 261 connects to the servo-side channel, and the second anti-cavitation through-hole 262 connects to the tank-side channel.

[0110] According to the second embodiment of this utility model, in Figure 3B and Figure 3CIn the process, when the fluid pressure in the servo-side channel 84 is not greater than the servo-side pressure threshold, the rod 120 is pressed against and closes the central through hole 115 on the internal valve seat 110 by the action of the first spring 130. When the fluid pressure in the servo-side channel 84 is greater than the servo-side pressure threshold, the fluid-driven rod 120 in the first region 101 moves to the right to open the central through hole 115 on the internal valve seat 110, and fluid communication is established between the first region 101 and the second region 102 until the fluid pressure in the servo-side channel 84 is no longer greater than the servo-side pressure threshold.

[0111] According to the second embodiment of this utility model, when the fluid pressure in the tank-side channel 82 is not greater than the tank-side pressure, the fluid pressure in the second region 102 does not exceed the tank-side pressure. In this case, such as Figure 3B As shown, on one hand, the internal valve seat 110 is pressed against and closes the central through hole 235 on the second valve seat 234 by the action of the second spring 140; on the other hand, the anti-cavitation spring 260 biases the tubular member 230 to close the fluid passage 250. When the fluid pressure in the tank-side passage 82 is greater than the tank-side pressure, the fluid pressure at the second region 102 also exceeds the tank-side pressure, such as... Figure 3C As shown, on the one hand, the fluid in the second region 102 pushes the internal valve seat 110 to the left to open the central through hole 235 on the second valve seat 234; on the other hand, the fluid in the second region 102 and the space fluidly communicating with the second region 102 pushes the entire tubular member 230 to move in the direction from the second end 202 to the first end 201 (i.e., in... Figure 3B and Figure 3C (Move from center to left) to open fluid channel 250. Thus, fluid communication is established between the tank-side channel and the servo-side channel until the fluid pressure in the tank-side channel 82 is no longer greater than the tank-side pressure.

[0112] According to this invention, since a fluid channel 250 is provided between the radial outer surface 238 of the tubular member 230 and the radial inner surface 229 of the sleeve 220, the fluid flow rate for cavitation prevention is increased, and the valve assembly 10 has an improved cavitation prevention effect. According to this second embodiment of the invention, when the second cavitation prevention through-hole 262 is located between the first cavitation prevention through-hole 261 and the second external through-hole 222 along the axial direction L, the length of the fluid path along the fluid channel 250 is reduced, the fluid flow resistance is reduced, and a further improved cavitation prevention effect is obtained.

[0113] Also refer to Figure 3A , Figure 3B and Figure 3CThe external shape of the assembly 200 is configured such that the valve assembly 10 is suitable for mounting into a fluid device along a direction from the second end 202 to the first end 201. Specifically, the radial external dimension of the assembly 200 decreases or remains substantially constant along the axial direction L from the second end 202 to the first end 201. Thus, the valve assembly 10 can be loaded into a corresponding valve receiving section of the fluid device, for example, into the valve receiving section of the intermediate component 90 of a flow amplifier, along the axial direction L from the second end 202 to the first end 201, without requiring modifications to the internal structure of the existing intermediate component 90.

[0114] Figure 4A A cross-sectional view of a valve assembly 10 according to a third embodiment of the present invention is shown. Figure 4A As shown, the valve assembly 10 includes Figure 1B The internal assembly 100 shown also includes an assembly assembly 200, the internal assembly 100 being disposed radially inside the assembly assembly 200. The assembly assembly 200 includes a sleeve 220 extending longitudinally along an axial direction L and a tubular member 230 disposed radially inside the sleeve 220, the internal assembly 100 being disposed radially inside the tubular member 230. The sleeve 220 defines a radially outer portion of the assembly assembly 200 within a portion of its axial extension.

[0115] Figure 4A The internal components 100 and sleeve 220 shown have respectively with Figure 3A The internal components shown have the same structure as sleeve 220, and will not be described in detail here. Figure 4A The tubular member 230 shown has the same Figure 3A The tubular member 230 shown has a basically the same structure and assembly relationship with the internal component 100 and sleeve 220, which will be described in detail below. Figure 4A The valve assembly 10 shown is with Figure 3A The differences in the valve assembly 10 shown.

[0116] like Figure 4A As shown, assembly 200 includes an anti-cavitation spring 260. The anti-cavitation spring 260 is a helical spring, positioned along the axial direction L on the outer side of the axial end 237 of the tubular member 230. Therefore, a spring is not required between the radial outer surface 238 of the tubular member and the radial inner surface 229 of the sleeve. See also... Figure 4B When the valve assembly 10 is installed in the fluid device, the anti-cavitation spring 260 is located between the axial end 237 of the tubular member 230 and the inner wall of the valve receiving part of the fluid device. Thus, the anti-cavitation spring 260 is configured to bias the tubular member 230 in the direction from the first end 201 to the second end 202, so as to cause the tubular member 230 to close the fluid passage 250.

[0117] Figure 4B A partial cross-sectional view of the flow amplifier is shown. Figure 4A The valve assembly 10 shown is installed in the valve receiving section of the flow amplifier, which is configured to receive a pilot-operated anti-cavitation overflow valve. It can be seen that... Figure 4A and Figure 4B The valve assembly 10 shown is capable of having the same Figures 3A to 3C The valve assembly 10 shown has the same anti-overflow function and similar improved anti-cavitation effect.

[0118] Also refer to Figure 4A and Figure 4B The external shape of the assembly 200 is configured such that the valve assembly 10 is suitable for mounting into a fluid device along a direction from the second end 202 to the first end 201. Specifically, the radial external dimension of the assembly 200 decreases or remains substantially constant along the axial direction L from the second end 202 to the first end 201. Thus, the valve assembly 10 can be loaded into a corresponding valve receiving section of the fluid device, for example, into the valve receiving section of the intermediate component 90 of a flow amplifier, along the axial direction L from the second end 202 to the first end 201, without requiring modifications to the internal structure of the existing intermediate component 90.

[0119] The valve assemblies 10 of the foregoing embodiments can be easily installed in various fluid devices, for example, to replace pilot-operated anti-cavitation relief valves. The fluid device may be, for example, a flow amplifier, in which case two valve assemblies 10 with identical structures can be arranged symmetrically to give the flow amplifier a faster response time and lower manufacturing cost.

[0120] The exemplary embodiments of the valve assembly, flow amplifier, and fluid equipment proposed by this utility model have been described in detail above with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the concept of this utility model, and various combinations can be made to the various technical features and structures proposed by this utility model without exceeding the protection scope of this utility model.

Claims

1. A valve assembly for use in fluid equipment, characterized in that, The valve assembly (10) includes: An internal component (100) that defines an axial direction (L); An assembly assembly (200) is provided, wherein an internal assembly (100) is disposed radially inside the assembly assembly (200), the assembly assembly (200) includes a first end (201) and a second end (202) opposite to the first end (201) in the axial direction, the assembly assembly (200) includes a cover portion (211) at the first end (201), the internal assembly (100) and the cover portion (211) constituting a direct-acting anti-cavitation overflow valve (11), wherein the direct-acting anti-cavitation overflow valve (11) defines a first region (101) configured to be in fluid communication with a first fluid channel of the fluid device and a second region (102) configured to be in fluid communication with a second fluid channel of the fluid device, the first region (101) being closer to the cover portion (211) in the axial direction (L) than the second region (102). The assembly component (200) includes at least one first external through-hole (221) and at least one second external through-hole (222). The first external through-hole (221) is in fluid communication with the first region (101) and is open on the outer surface of the assembly component (200). The second external through-hole (222) is in fluid communication with the second region (102) and is open on the outer surface of the assembly component (200). The first external through-hole (221) is closer to the first end (201) of the assembly component in the axial direction (L) than the second external through-hole (222). The external shape of the assembly assembly (200) is configured such that the valve assembly (10) is adapted to be installed into the fluid device in a direction from the second end (202) to the first end (201).

2. The valve assembly according to claim 1, characterized in that, The radial external dimension of the assembly (200) decreases or remains substantially constant in the axial direction (L) from the second end (202) to the first end (201).

3. The valve assembly according to claim 1, characterized in that, The assembly (200) includes a sleeve (220) extending longitudinally along an axial direction (L), the sleeve (220) defining a radially outer portion of the assembly (200) in at least a portion of the axial extension range of the assembly (200).

4. The valve assembly according to claim 3, characterized in that, The internal component (100) is disposed radially inside the sleeve (220), the sleeve (220) including a sleeve axial end (227) located at a first end (201) of the assembly component (200), the sleeve axial end (227) defining the cover portion (211), and a first external through hole (221) and a second external through hole (222) disposed on the sleeve (220).

5. The valve assembly according to claim 4, characterized in that, The assembly assembly (200) further includes a first valve seat (240) fixed to the radially inner side of the sleeve (220), and the internal assembly (100) is arranged between the first valve seat (240) and the cover portion (211).

6. The valve assembly according to claim 3, characterized in that, The assembly assembly (200) includes a tubular member (230) disposed radially inside the sleeve (220), the inner assembly (100) being disposed radially inside the tubular member (230), the tubular member (230) including an axial end (237) of the tubular member located at a first end (201) of the assembly assembly (200), the axial end (237) of the tubular member defining the cover portion (211), a first external through hole (221) being disposed on the tubular member (230), and a second external through hole (222) being disposed on the sleeve (220).

7. The valve assembly according to claim 6, characterized in that, The sleeve (220) is provided with at least one first anti-cavitation through hole (261) and at least one second anti-cavitation through hole (262). A fluid channel (250) connecting the first anti-cavitation through hole (261) and the second anti-cavitation through hole (262) is defined between the radial outer surface (238) of the tubular member and the radial inner surface (229) of the sleeve. The tubular member (230) is movable in the axial direction (L) to open or close the fluid channel (250). The assembly component (200) is configured such that, when the fluid pressure in the second region (102) does not exceed the tank side pressure, the tubular member (230) closes the fluid passage (250), and when the fluid pressure in the second region (102) exceeds the tank side pressure, the tubular member (230) moves in a direction from the second end (202) to the first end (201) to open the fluid passage (250).

8. The valve assembly according to claim 7, characterized in that, The second anti-cavitation through hole (262) is closer to the first end (201) of the assembly (200) in the axial direction (L) than the second external through hole (222).

9. The valve assembly according to claim 7, characterized in that, The assembly (200) includes an anti-cavitation spring (260) configured to bias the tubular member (230) in a direction from the first end (201) to the second end (202).

10. The valve assembly according to claim 9, characterized in that, The anti-cavitation spring (260) is a helical spring that is wound around the radial outer surface (238) of the tubular member and located between the radial outer surface (238) of the tubular member and the radial inner surface (229) of the sleeve.

11. The valve assembly according to claim 9, characterized in that, The anti-cavitation spring (260) is a helical spring, and the anti-cavitation spring (260) is disposed on the outside of the axial end (237) of the tubular member along the axial direction.

12. The valve assembly according to any one of claims 1 to 11, characterized in that, The first fluid channel is the servo-side channel of the fluid device, and the second fluid channel is the tank-side channel of the fluid device.

13. The valve assembly according to any one of claims 1 to 11, characterized in that, The fluid device is a flow amplifier, the first external through hole (221) on the outer surface of the assembly (200) leads to the servo-side channel of the flow amplifier, and the second external through hole (222) on the outer surface of the assembly (200) leads to the tank-side channel of the flow amplifier.

14. A flow amplifier, characterized in that, The flow amplifier includes one or more valve assemblies (10) according to any one of claims 1 to 13.

15. A fluid device, characterized in that, The fluid device includes one or more valve assemblies (10) according to any one of claims 1 to 13.

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