Hydraulic signal filtering device and feedback hydraulic system

Abstract

The utility model provides a hydraulic signal filtering device and a feedback hydraulic system, the hydraulic signal filtering device comprises a shell, a cylindrical valve cavity is arranged in the shell, two ends of the valve cavity are respectively provided with an external channel, and the flow area of the external channel is smaller than that of the valve cavity; a throttling core capable of moving in the axial direction of the throttling core is arranged in the valve cavity, and a gap channel is formed between at least one side of the throttling core and the inner wall of the valve cavity. Bosses are arranged at the two ends of the throttling core respectively, the small ends of the bosses can stretch into the external channel, and throttling grooves are formed between the side faces of the bosses and the inner wall of the external channel. According to the utility model, the two ends of the valve cavity are respectively and independently concentrated with oil, so that the pressure change speed is respectively slowed down; the circulation area of the feedback oil liquid changes for many times, and the superposition filtering effect is achieved; therefore, the hydraulic signal fed back to the variable pump changes gently, and it is guaranteed that the output pressure of the variable pump is stable.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic systems, in particular to a hydraulic signal filtering device and a feedback hydraulic system. Background Art

[0002] When the lifting hydraulic system is lifting the hooked implement, it is necessary to continuously feed back the hydraulic signal to the variable pump to maintain a constant output of the variable pump. In the current hydraulic system with a variable pump, a one-way valve and a throttle hole are connected in parallel on the feedback oil circuit. After the parallel connection, one end is connected to the feedback oil port of the multi-way valve, and the other end is connected to the feedback interface of the variable pump. The feedback hydraulic oil of the multi-way valve is fed back to the feedback interface of the variable pump through the one-way valve and the throttle hole. However, since the load on the lifting cylinder is always in a dynamically changing state, the hydraulic pressure fed back to the variable pump by the multi-way valve fluctuates continuously, causing the output pressure of the variable pump to fluctuate continuously, which leads to continuous jitter of the working process of the actuator and poor stability. Utility Model Content

[0003] The technical problem to be solved by the utility model is: how to reduce the fluctuation of the hydraulic signal fed back to the variable pump.

[0004] The technical solution of the utility model to solve the above technical problems is as follows:

[0005] The utility model provides a hydraulic signal filtering device, comprising a shell, wherein a cylindrical valve cavity is arranged in the shell, and external channels are respectively arranged at both ends of the valve cavity, and the flow area of ​​the external channels is smaller than the flow area of ​​the valve cavity; a throttling core capable of moving along its own axial direction is arranged in the valve cavity, and a gap channel is arranged between at least one side of the throttling core and the inner wall of the valve cavity; bosses are respectively arranged at both ends of the throttling core, and the small ends of the bosses can extend into the external channel, and a throttling groove is arranged between the side of the boss and the inner wall of the external channel.

[0006] The beneficial effects of the utility model are:

[0007] By adopting the utility model, the valve cavity is divided into two parts by the throttling core, and the two ends of the valve cavity independently concentrate oil, respectively slowing down the pressure change speed; the gap channel can make the oil in the two parts flow, and the throttling groove increases the flow damping, so that the flow area of ​​the feedback oil changes multiple times, avoiding sudden changes in oil pressure, and playing a superposition filtering role; thus, the hydraulic signal fed back to the variable pump changes smoothly, reducing the fluctuation of the hydraulic signal, ensuring the stability of the output pressure of the variable pump, and avoiding the jitter of the actuator during the working process.

[0008] On the basis of the above technical solution, the present invention can also be improved as follows.

[0009] Furthermore, the gap channel and the throttling groove are staggered with each other along the circumferential direction of the large end of the boss.

[0010] It is convenient to stabilize the oil pressure in the valve cavity before flowing out from the gap channel or the throttling groove, avoiding direct transmission of oil pressure between the throttling groove and the gap channel, thereby improving the filtering effect.

[0011] Furthermore, there are two gap channels, which are respectively located on both sides of the throttling core; two throttling grooves are provided between the side surface of each boss and the inner wall of the corresponding external channel; the throttling grooves and the gap channels are staggeredly distributed along the circumference of the large end of the boss.

[0012] It is convenient to make the pressure change in the valve cavity uniform.

[0013] Furthermore, the throttling groove and the gap channel are staggered by 90° along the circumferential direction of the large end of the boss.

[0014] It is convenient to make the pressure on both sides of either end of the valve cavity change symmetrically, make the pressure of the valve cavity uniform, and reduce the pressure mutation.

[0015] Furthermore, the gap channel is opened on the throttling core, and the throttling groove is opened on the boss.

[0016] Even if the throttling core rotates, the relative position of the gap channel and the throttling groove will not change, and the size of the gap channel and the throttling groove will not change. The working state is stable and the reliability is good.

[0017] Furthermore, cutting surfaces are provided on opposite sides of the throttling core, and the gap channel is formed between the cutting surfaces and the inner wall of the valve cavity.

[0018] The processing is convenient, and the manufacturing cost is reduced; at the same time, the side surface of the throttling core except the cutting surface is in contact with the valve cavity, which is convenient for guiding and has good stability.

[0019] Furthermore, the throttling core is cylindrical, and the cutting surface is a plane; the boss is truncated cone-shaped; and the external channel and the valve cavity are both cylindrical.

[0020] The processing is convenient, and the gap between the angular structure and the inner wall of the valve cavity is avoided, thereby improving the filtering effect.

[0021] Furthermore, a joint is provided at one end of the shell, and an external thread is provided on the joint.

[0022] It is easy to connect to the feedback oil port of the multi-way valve through a joint, and is easy to install.

[0023] Furthermore, a step hole is provided at the other end of the shell, one end of the external channel is connected to the middle of the step hole, and an internal thread is provided in the step hole.

[0024] The step hole and its internal thread facilitate the connection of the hydraulic pipeline, and the feedback interface of the variable pump is connected through the hydraulic pipeline; the end face of the hydraulic pipeline can form a seal with the bottom face of the step hole, which is easy to install and has low processing cost.

[0025] The utility model also provides a feedback hydraulic system, including a variable plunger pump, a multi-way valve and a load cylinder, the outlet of the variable plunger pump is connected to the multi-way valve, and the outlet of the multi-way valve is connected to the load cylinder; it also includes the above-mentioned hydraulic signal filtering device, one end of the shell is connected to the feedback oil port of the multi-way valve, and the other end of the shell is connected to the feedback interface of the variable plunger pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the hydraulic signal filter device in state 1 of the utility model.

[0027] Figure 2 This is a structural diagram of the hydraulic signal filter device in state 2 of the utility model.

[0028] Figure 3 This is a structural schematic diagram of state three of the hydraulic signal filter device of the utility model.

[0029] Figure 4 It is a structural schematic diagram of the throttling core.

[0030] Figure 5 It is a structural schematic diagram of the feedback hydraulic system of the utility model.

[0031] In the accompanying drawings, the technical features represented by the reference numerals are as follows:

[0032] 1-housing; 2-external channel; 3-valve chamber; 4-throttling core; 5-clearance channel; 6-boss; 7-throttling groove; 8-cutting surface; 9-connector; 10-step hole; 11-variable piston pump; Ls-feedback interface; 12-multi-way valve; Y-feedback oil port; 13-load cylinder. DETAILED DESCRIPTION

[0033] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0034] This utility model refers to Figure 1-5 .

[0035] Embodiment 1, as Figure 1-4 As shown:

[0036] The utility model provides a hydraulic signal filtering device, comprising a shell 1, wherein a cylindrical valve cavity 3 is arranged in the shell 1, and external channels 2 are respectively arranged at both ends of the valve cavity 3, and the flow area of ​​the external channel 2 is smaller than the flow area of ​​the valve cavity 3; a throttling core 4 capable of moving along its own axial direction is arranged in the valve cavity 3, and a gap channel 5 is arranged between at least one side of the throttling core 4 and the inner wall of the valve cavity 3; bosses 6 are respectively arranged at both ends of the throttling core 4, and the small end of the boss 6 can extend into the external channel 2, and a throttling groove 7 is arranged between the side of the boss 6 and the inner wall of the external channel 2.

[0037] principle:

[0038] In the installed state, the utility model is in the feedback oil circuit of the hydraulic system. One end of the housing 1 is connected to the feedback oil port Y of the multi-way valve 12, so that the feedback oil port Y is connected to the external channel 2 at one end of the valve chamber 3; the other end of the housing 1 is connected to the feedback interface Ls of the variable pump, so that the feedback interface Ls is connected to the external channel 2 at the other end of the valve chamber 3. Figure 1-3 The right end is connected to the feedback oil port Y of the multi-way valve 12, and the left end is connected to the feedback interface Ls of the variable pump as an example: State 1 (such as Figure 1 ) is the initial state. When the multi-way valve 12 feeds back the oil, the oil in the external channel 2 on the right side of the valve chamber 3 enters the right end of the valve chamber 3 from the throttling groove 7 on the boss 6 at the right end of the throttling core 4, and at the same time pushes the throttling core 4 to move left to the state 2 (such as Figure 2 ); At this time, the oil enters the left end of the valve chamber 3 from the gap channel 5. At the same time, the oil at the right end of the valve chamber 3 continues to push the throttling core 4 to move left to state three (such as Figure 3 ); At this time, the oil at the left end of the valve chamber 3 enters the external channel 2 on the left side of the valve chamber 3 from the throttling groove 7 on the boss 6 at the left end of the throttling core 4, and is finally fed back to the feedback interface Ls of the variable pump.

[0039] When the load suddenly decreases significantly, the pressure of the feedback oil port Y of the multi-way valve 12 suddenly decreases, and the pipeline pressure on the feedback interface Ls side of the variable pump pushes the throttling core 4 from state three (such as Figure 3 ) moves to state 2 (such as Figure 2 ), then move to state 1 (such as Figure 1 ). Until the pipeline pressure on the feedback interface Ls side of the variable pump drops to a stable level, the oil flow process pushes the throttling core 4 to gradually move to state 3 again. The movement of the throttling core 4 is subject to hydraulic resistance, so it can only move slowly to avoid sudden changes in the pipeline pressure on the feedback interface Ls side of the variable pump.

[0040] In summary, by adopting the utility model, the valve chamber 3 is divided into two parts by the throttling core 4, and the two ends of the valve chamber 3 independently concentrate the oil, respectively slowing down the pressure change speed; the gap channel 5 can make the oil in the two parts flow, and the throttling groove 7 increases the flow damping, so that the flow area of ​​the feedback oil changes multiple times, avoiding sudden changes in oil pressure, and playing a superposition filtering role; thus, the hydraulic signal fed back to the variable pump changes smoothly, reducing the fluctuation of the hydraulic signal, ensuring the stability of the output pressure of the variable pump, and avoiding the jitter of the working process of the actuator.

[0041] Furthermore, the gap channel 5 and the throttling groove 7 are staggered with each other along the circumferential direction of the large end of the boss 6 .

[0042] It is convenient to stabilize the oil pressure in the valve cavity 3 before flowing out from the gap channel 5 or the throttling groove 7, avoiding direct transmission of oil pressure between the throttling groove 7 and the gap channel 5, thereby improving the filtering effect.

[0043] Furthermore, there are two gap channels 5, which are respectively located on both sides of the throttling core 4; two throttling grooves 7 are provided between the side surface of each boss 6 and the inner wall of the corresponding external channel 2; the throttling grooves 7 and the gap channels 5 are staggeredly distributed along the circumference of the large end of the boss 6.

[0044] Note: The position of the throttling groove 7 on any boss 6 can be the same as the throttling groove 7 on another boss 6. On the large end of each boss 6, the throttling groove 7 and the gap channel 5 are staggered.

[0045] This facilitates the uniform change of the pressure in the valve chamber 3.

[0046] Furthermore, the throttling groove 7 and the clearance channel 5 are staggered by 90° along the circumferential direction of the large end of the boss 6 .

[0047] It is convenient to make the pressure on both sides of either end of the valve cavity 3 change symmetrically, so that the pressure of the valve cavity 3 is uniform and the pressure mutation is reduced.

[0048] Furthermore, the gap channel 5 is opened on the throttling core 4 , and the throttling groove 7 is opened on the boss 6 .

[0049] Even if the throttling core 4 rotates, the relative positions of the gap channel 5 and the throttling groove 7 will not change, and the sizes of the gap channel 5 and the throttling groove 7 will not change. The working state is stable and the reliability is good.

[0050] Furthermore, cutting surfaces 8 are provided on opposite sides of the throttling core 4 , and the gap channel 5 is formed between the cutting surface 8 and the inner wall of the valve cavity 3 .

[0051] The processing is convenient, and the manufacturing cost is reduced; at the same time, the side surface of the throttling core 4 except the cutting surface 8 is in contact with the valve cavity 3, which is convenient for guiding and has good stability.

[0052] Furthermore, the throttling core 4 is cylindrical, and the cutting surface 8 is a plane; the boss 6 is truncated cone-shaped; and the external channel 2 and the valve cavity 3 are both cylindrical.

[0053] The processing is convenient, and a gap between the angular structure and the inner wall of the valve cavity 3 is avoided, thereby improving the filtering effect.

[0054] Furthermore, a connector 9 is provided at one end of the housing 1, and an external thread is provided on the connector 9.

[0055] It is convenient to connect to the feedback oil port Y of the multi-way valve 12 through the connector 9, and is easy to install.

[0056] Furthermore, a step hole 10 is further provided at the other end of the shell 1 , one end of the external channel 2 is connected to the middle of the step hole 10 , and an internal thread is provided in the step hole 10 .

[0057] The step hole 10 and its internal thread facilitate the connection of the hydraulic pipeline, and the feedback interface Ls of the variable pump is connected through the hydraulic pipeline; the end surface of the hydraulic pipeline can form a seal with the bottom surface of the step hole 10, which is easy to install and has low processing cost.

[0058] Embodiment 2, as Figure 5 As shown:

[0059] The utility model also provides a feedback hydraulic system, including a variable piston pump 11, a multi-way valve 12 and a load cylinder 13, wherein the outlet of the variable piston pump 11 is connected to the multi-way valve 12, and the outlet of the multi-way valve 12 is connected to the load cylinder 13; it also includes the above-mentioned hydraulic signal filtering device, wherein one end of the housing 1 is connected to the feedback oil port Y of the multi-way valve 12, and the other end of the housing 1 is connected to the feedback interface Ls of the variable piston pump 11.

[0060] Note: The multi-way valve 12 and the variable piston pump 11 are existing technologies, and their feedback oil port Y and feedback interface Ls are both existing technology structures.

[0061] In the description of the present invention, it should be understood that if there are descriptive terms indicating orientation, direction or positional relationship, such as: "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated in this specification is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of understanding the present invention and simplifying the description, and does not indicate or imply that the referred part, element or whole must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0062] In addition, if there are order description terms, such as "first", "second", etc., their purpose in this specification is to facilitate understanding or simplify description. For example, in order to distinguish multiple technical features of the same type or function, but they have to be mentioned separately, this specification may use prefix or suffix order description terms to distinguish them. Therefore, it cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0063] In the present utility model, if the terms describing the relative functional relationship of the structures are used, such as "install", "connect", "connect", "fix", etc., they should be understood in a broad sense unless otherwise clearly specified and limited. For example, "install", "connect", "connect", etc. can be a fixed connection, a detachable connection, or an integrated one; can be a mechanical connection or an electrical connection; can be a direct connection or an indirect connection through an intermediate medium, can be the internal connection of two elements or the interaction relationship between two elements; "fix" can be an integrated fixation or a detachable fixation through fasteners; can be a direct fixation or a fixation through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above-mentioned descriptive terms in the present utility model can be understood according to the specific circumstances, the context, the coherence of the context, etc.

[0064] In the present invention, if there are descriptive terms with subsidiary or connecting meanings, for example, a first feature is "on" or "below" a second feature, unless otherwise clearly specified and limited, it should not be understood in a restrictive manner. For example, "on" or "below" may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above descriptive terms in the present invention can be understood according to the specific circumstances, the context, the coherence of the context, etc.

[0065] Furthermore, the first feature being “above”, “above”, and “above” the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being “below”, “below”, and “below” the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0066] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments, examples and features of the different embodiments and examples described in this specification without contradiction, and these combinations or combinations shall all fall within the scope summarized by the utility model.

[0067] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. A person skilled in the art can change, modify, replace and modify the above embodiments within the scope of information available from public channels and in combination with the technical inspiration provided by the present application documents.

Claims

1. A hydraulic signal filtering device, characterized in that: The invention comprises a shell (1), wherein a cylindrical valve cavity (3) is arranged in the shell (1), and external channels (2) are arranged at both ends of the valve cavity (3), and the flow area of ​​the external channel (2) is smaller than the flow area of ​​the valve cavity (3); a throttling core (4) capable of moving along its own axial direction is arranged in the valve cavity (3), and a gap channel (5) is arranged between at least one side of the throttling core (4) and the inner wall of the valve cavity (3); bosses (6) are arranged at both ends of the throttling core (4), and the small end of the boss (6) can extend into the external channel (2), and a throttling groove (7) is arranged between the side of the boss (6) and the inner wall of the external channel (2).

2. The hydraulic signal filter device according to claim 1, characterized in that: The gap channel (5) and the throttling groove (7) are staggered with each other along the circumferential direction of the large end of the boss (6).

3. The hydraulic signal filter device according to claim 2, characterized in that: The gap channels (5) are provided with two, and the two gap channels (5) are respectively located on both sides of the throttling core (4); two throttling grooves (7) are provided between the side surface of each boss (6) and the inner wall of the corresponding external channel (2); the throttling grooves (7) and the gap channels (5) are staggeredly distributed along the circumference of the large end of the boss (6).

4. The hydraulic signal filter device according to claim 3, characterized in that: The throttling groove (7) and the clearance channel (5) are staggered by 90 degrees along the circumferential direction of the large end of the boss (6).

5. The hydraulic signal filter device according to claim 4, characterized in that: The gap channel (5) is opened on the throttling core (4), and the throttling groove (7) is opened on the boss (6).

6. The hydraulic signal filter device according to claim 5, characterized in that: Cutting surfaces (8) are provided on opposite sides of the throttling core (4), and the gap channel (5) is formed between the cutting surface (8) and the inner wall of the valve cavity (3).

7. The hydraulic signal filter device according to claim 6, characterized in that: The throttling core (4) is cylindrical, and the cutting surface (8) is a plane; the boss (6) is truncated cone-shaped; and the external channel (2) and the valve chamber (3) are both cylindrical.

8. The hydraulic signal filter device according to claim 1, characterized in that: One end of the housing (1) is also provided with a joint (9), and the joint (9) is provided with an external thread.

9. The hydraulic signal filter device according to claim 1, characterized in that: The other end of the housing (1) is further provided with a stepped hole (10), one end of the externally connected channel (2) is connected to the middle of the stepped hole (10), and an internal thread is provided in the stepped hole (10).

10. A feedback hydraulic system, comprising a variable piston pump (11), a multi-way valve (12) and a load cylinder (13), wherein the outlet of the variable piston pump (11) is connected to the multi-way valve (12), and the outlet of the multi-way valve (12) is connected to the load cylinder (13); characterized in that: It also includes the hydraulic signal filtering device according to any one of claims 1 to 9, wherein one end of the housing (1) is connected to the feedback oil port (Y) of the multi-way valve (12), and the other end of the housing (1) is connected to the feedback interface (Ls) of the variable piston pump (11).

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