Automatic pressure compensation control unit

Abstract

The utility model discloses an automatic pressure compensation control unit, which relates to the technical field of pressure control and comprises a valve body and a slide valve. A sliding channel, a pushing cavity, an oil inlet cavity, an oil outlet cavity and a load feedback cavity are formed in the valve body. The sliding valve is arranged in the sliding channel in a sliding mode and divides the pushing cavity, the oil inlet cavity, the oil outlet cavity and the load feedback cavity evenly. A placing groove is formed in one end of the slide valve; a spring is arranged in the placing groove; an annular rib is arranged on the slide valve, a first annular groove and a second annular groove are formed in the two sides of the annular rib, the first annular groove is communicated with the oil inlet cavity, and the second annular groove is communicated with the oil outlet cavity; a plurality of throttling grooves are formed in the annular rib; a communicating channel communicating with the pushing cavity is formed in the sliding valve. The valve body is provided with an oil outlet channel which is communicated with the oil outlet cavity; the valve body is provided with a load channel communicating with the load hole, and the load channel can communicate with the load feedback cavity. The multi-way valve without pressure compensation can achieve pressure compensation, and stability of output flow is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure control, in particular to a control unit with automatic pressure compensation. Background Art

[0002] At present, for the multi-way valves used in both the construction machinery industry and the agricultural machinery industry, there are increasingly strict requirements for the output flow rate, which directly affects the operating speed of the actuator; therefore, it is difficult for some multi-way valves without a pressure compensation unit to meet the requirements. Based on this, in line with the principle of being able to automatically compensate for pressure and adjust the flow rate as needed, a control unit with automatic pressure compensation that can be used on multi-way valves without a pressure compensation unit is developed and designed. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a control unit with automatic pressure compensation to solve the problems existing in the above-mentioned prior art, so that the multi-way valve without pressure compensation can achieve pressure compensation and improve the stability of the output flow rate.

[0004] To achieve the above purpose, the utility model provides the following scheme:

[0005] The utility model provides a control unit with automatic pressure compensation, including a valve body and a spool valve; a sliding channel is arranged inside the valve body, and a pushing cavity, an oil inlet cavity, an oil outlet cavity and a load feedback cavity communicating with the sliding channel are sequentially arranged along the axial direction of the sliding channel; the spool valve is slidably arranged inside the sliding channel, and the spool valve separates the pushing cavity, the oil inlet cavity, the oil outlet cavity and the load feedback cavity; a placing groove is arranged at one end of the spool valve located in the load feedback cavity, a spring is arranged inside the placing groove, and the other end of the spring abuts against the corresponding side end of the sliding channel; an annular rib is arranged on the spool valve, a first annular groove and a second annular groove are arranged on the spool valve on both sides of the annular rib, the first annular groove communicates with the oil inlet cavity, and the second annular groove communicates with the oil outlet cavity; a plurality of throttling grooves for communicating the oil inlet cavity and the oil outlet cavity are arranged on the annular rib; a communication channel is arranged inside the spool valve, one end opening of the communication channel communicates with the pushing cavity, a damper is arranged inside the communication channel; and the other end of the communication channel is provided with a plurality of through holes, and each through hole communicates with the oil outlet cavity; an oil outlet channel is arranged on the valve body, one end of the oil outlet channel communicates with the oil outlet cavity, and the other end of the oil outlet channel is used for communicating with the oil inlet of the multi-way valve; a load channel is arranged on the valve body, the load channel communicates with the load hole, and the load channel can communicate with the load feedback cavity.

[0006] Preferably, a plurality of pressure equalizing grooves are arranged on the part of the outer wall of the spool valve in contact with the inner wall of the sliding channel.

[0007] Preferably, one end of the sliding channel is provided as an installation port, and a sealing plug is blocked at the installation port.

[0008] Preferably, the throttling groove includes a first cylindrical groove and a second cylindrical groove; the axis of the first cylindrical groove is parallel to the axis of the second cylindrical groove, and the first cylindrical groove is closer to the oil inlet cavity than the second cylindrical groove; the inner diameter of the first cylindrical groove is smaller than the inner diameter of the second cylindrical groove; the distance between the axis of the first cylindrical groove and the axis of the second cylindrical groove is less than the sum of the radius of the first cylindrical groove and the radius of the second cylindrical groove; the openings of the first cylindrical groove and the second cylindrical groove are communicated, and both can be communicated with the oil inlet cavity; the side of the second cylindrical groove away from the first cylindrical groove is communicated with the oil outlet cavity, and the distance between the opening of the second cylindrical groove for communicating with the oil outlet cavity and the opening of the second cylindrical groove for communicating with the first cylindrical groove is less than the radius of the second cylindrical groove.

[0009] Preferably, a limiting groove is provided corresponding to one end of the spring in the load feedback cavity, and the end of the spring away from the spool is located in the limiting groove.

[0010] Preferably, the load channel includes a first straight channel and a second straight channel; one end opening of the first straight channel is communicated with the load feedback cavity, and the other end opening of the first straight channel is blocked by a first plug; one end opening of the second straight channel is communicated with the load hole, and the one end opening of the second straight channel is blocked by a second plug; the first straight channel and the second straight channel are cross - communicated.

[0011] The utility model has achieved the following technical effects compared with the prior art:

[0012] For the automatic pressure compensation control unit provided by the utility model, the oil in the oil inlet cavity enters the oil outlet cavity after throttling through each throttling groove. Part of the oil in the oil outlet cavity forms an oil path through the through - hole and the communication channel and enters the pushing cavity through the damping, and acts on the corresponding end face of the spool on this side; another part of the oil in the oil outlet cavity enters the oil inlet of the multi - way valve; while the end face at the other end of the spool corresponds to the spring and the oil pressure in the load feedback cavity. When the multi - way valve is working, the spool will always be dynamically balanced under the action of the forces at both ends, and the balanced force is spring force + oil pressure in the load feedback cavity = corresponding oil pressure in the oil outlet cavity. When the oil pressure changes, the spool slides in the sliding channel, and then the opening degree of the throttling groove changes adaptively, so as to achieve automatic pressure compensation. After the opening degree of the throttling groove changes, the spring can also make corresponding adaptive actions to slow down its pressure change and improve the stability of pressure compensation. It enables the multi - way valve without pressure compensation to achieve pressure compensation and improve the stability of the output flow.

[0013] Furthermore, the design of the pressure equalizing groove helps to reduce the pressure difference on both sides of the slide valve, so that the slide valve is subjected to more uniform force during operation, thereby reducing vibration and noise caused by uneven pressure.

[0014] Furthermore, a bag sealing screw plug is used in conjunction with the installation port, which can facilitate the installation and removal of the slide valve in the sliding channel.

[0015] Furthermore, a throttling groove is formed by cooperating with the first cylindrical groove and the second cylindrical groove. The smaller circular opening of the first cylindrical groove can provide a more precise flow regulation capability; while the larger circular opening of the second cylindrical groove has a larger flow area, which can provide a larger flow passing capacity when the sliding valve has a large displacement, and the pressure compensation corresponding to the movement of the sliding valve is faster, more stable and reliable.

[0016] Furthermore, the provision of the limiting groove can make the end of the spring more stable, thereby ensuring a stable spring thrust.

[0017] Furthermore, the provision of the first straight channel and the second straight channel facilitates the communication between the load hole and the load feedback cavity, and is simpler and more convenient in processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the overall structure of the automatic pressure compensation control unit provided by the utility model;

[0020] Figure 2 A schematic diagram of the structure of a slide valve in the automatic pressure compensation control unit provided by the utility model;

[0021] Figure 3 This is a schematic diagram of the automatic pressure compensation control unit provided by the utility model.

[0022] In the figure:

[0023] 100-Control unit for automatic pressure compensation;

[0024] 10-valve body; 11-sliding channel; 12-pushing chamber; 13-oil inlet chamber; 14-oil outlet chamber; 15-load feedback chamber; 16-limiting groove; 17-sealed screw plug; 18-load channel; 181-first straight channel; 182-second straight channel; 183-first plug; 184-second plug;

[0025] 20 - Slide valve; 21 - Resting groove; 22 - Annular rib; 23 - Throttle groove; 231 - First cylindrical groove; 232 - Second cylindrical groove; 24 - Pressure equalizing groove;

[0026] 30 - Spring. Detailed implementation manner

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] The purpose of the present invention is to provide a control unit with automatic pressure compensation to solve the problems existing in the prior art, so that a multi-way valve without pressure compensation can achieve pressure compensation and improve the stability of the output flow rate.

[0029] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0030] Embodiment 1

[0031] This embodiment provides a control unit 100 with automatic pressure compensation, which is mainly used for a multi-way valve without pressure compensation, such as Figures 1 to 3As shown in the figure, it includes a valve body 10 and a spool valve 20; a sliding channel 11 is provided inside the valve body 10, and a pushing cavity 12, an oil inlet cavity 13, an oil outlet cavity 14, and a load feedback cavity 15 communicating with the sliding channel 11 are sequentially arranged along the axial direction of the sliding channel 11; the spool valve 20 is slidably arranged inside the sliding channel 11, and the spool valve 20 separates the pushing cavity 12, the oil inlet cavity 13, the oil outlet cavity 14, and the load feedback cavity 15; a placing groove 21 is provided at one end of the spool valve 20 located in the load feedback cavity 15, a spring 30 is arranged inside the placing groove 21, and the other end of the spring 30 abuts against the corresponding end of the sliding channel 11 on one side; an annular rib 22 is arranged on the spool valve 20, a first annular groove and a second annular groove are arranged on the spool valve 20 on both sides of the annular rib 22, the first annular groove communicates with the oil inlet cavity 13, and the second annular groove communicates with the oil outlet cavity 14; a plurality of throttle grooves 23 for communicating the oil inlet cavity 13 and the oil outlet cavity 14 are arranged on the annular rib 22; a communication channel is arranged inside the spool valve 20, one end opening of the communication channel communicates with the pushing cavity 12, and a damper is arranged inside the communication channel; and the other end of the communication channel is provided with a plurality of through holes, and each through hole communicates with the oil outlet cavity 14; an oil outlet channel is arranged on the valve body 10, one end of the oil outlet channel communicates with the oil outlet cavity 14, and the other end of the oil outlet channel is used for communicating with the oil inlet of the multi-way valve; a load channel 18 is arranged on the valve body 10, the load channel 18 communicates with the load hole, and the load channel 18 can communicate with the load feedback cavity 15.

[0032] The oil in the oil inlet cavity 13 enters the oil outlet cavity 14 after throttling through each throttle groove 23. A part of the oil in the oil outlet cavity 14 enters the pushing cavity 12 through the oil path formed by the through holes and the communication channel and passes through the damper, and the oil acts on the corresponding end face of the spool valve 20 on this side; another part of the oil in the oil outlet cavity 14 enters the oil inlet of the multi-way valve; and the end face at the other end of the spool valve 20 corresponds to the spring 30 and the oil pressure in the load feedback cavity 15; when the multi-way valve is working, the spool valve 20 is always dynamically balanced under the action of the forces at both ends, and the balanced force is the spring force + the oil pressure in the load feedback cavity 15 = the corresponding oil pressure in the oil outlet cavity 14. When the oil pressure changes, the spring 30 can perform corresponding actions. The spool valve 20 slides in the sliding channel 11, and then the opening degree of the throttle groove 23 changes adaptively, so as to realize automatic pressure compensation. After the opening degree of the throttle groove 23 changes, the spring 30 can also perform corresponding adaptation actions to slow down its pressure change and improve the stability of pressure compensation. It enables the multi-way valve without pressure compensation to realize pressure compensation and improve the stability of the output flow.

[0033] Among them, the relevant settings of the sliding channel 11 are described as follows:

[0034] In the optional solution of this embodiment, preferably, as Figure 1As shown in the figure, one end of the sliding channel 11 is set as an installation port, and a sealing plug 17 is plugged at the installation port. The use of the bag sealing plug in cooperation with the installation port enables the convenient installation and disassembly of the slide valve 20 in the sliding channel 11.

[0035] In an alternative embodiment of the present embodiment, preferably, as Figure 1 shown in the figure, a limiting groove 16 is provided at one end of the load feedback cavity 15 corresponding to one end of the spring 30, and one end of the spring 30 away from the slide valve 20 is located in the limiting groove 16. The provision of the limiting groove 16 can make the end of the spring 30 more stable and ensure the stable spring 30 thrust.

[0036] In an alternative embodiment of the present embodiment, preferably, as Figure 1 shown in the figure, the load channel 18 includes a first straight channel 181 and a second straight channel 182; one end opening of the first straight channel 181 communicates with the load feedback cavity 15, and the other end opening of the first straight channel 181 is plugged with a first plug 183; one end opening of the second straight channel 182 communicates with the load hole, and one end opening of the second straight channel 182 is plugged with a second plug 184; the first straight channel 181 and the second straight channel 182 intersect and communicate. The settings of the first straight channel 181 and the second straight channel 182 facilitate the communication between the load hole and the load feedback cavity 15 and are more simple and convenient in processing.

[0037] Among them, the relevant settings of the slide valve 20 are described as follows:

[0038] In an alternative embodiment of the present embodiment, preferably, as Figure 1 and Figure 2 shown in the figure, a plurality of pressure equalizing grooves 24 are provided on the part of the outer wall of the slide valve 20 in contact with the inner wall of the sliding channel 11. The design of the pressure equalizing grooves 24 helps to reduce the pressure difference on both sides of the slide valve 20, makes the force on the slide valve 20 more uniform during operation, and thus reduces the vibration and noise caused by uneven pressure.

[0039] In an alternative embodiment of the present embodiment, preferably, as Figure 1 and Figure 2As shown in the figure, the throttle groove 23 includes a first cylindrical groove 231 and a second cylindrical groove 232; the axis of the first cylindrical groove 231 is parallel to the axis of the second cylindrical groove 232, and the first cylindrical groove 231 is closer to the oil inlet chamber 13 than the second cylindrical groove 232; the inner diameter of the first cylindrical groove 231 is smaller than the inner diameter of the second cylindrical groove 232; the distance between the axis of the first cylindrical groove 231 and the axis of the second cylindrical groove 232 is less than the sum of the radius of the first cylindrical groove 231 and the radius of the second cylindrical groove 232; the openings of the first cylindrical groove 231 and the second cylindrical groove 232 are in communication, and both can be in communication with the oil inlet chamber 13; the side of the second cylindrical groove 232 away from the first cylindrical groove 231 is in communication with the oil outlet chamber 14, and the distance between the opening of the second cylindrical groove 232 for communicating with the oil outlet chamber 14 and the opening of the second cylindrical groove 232 for communicating with the first cylindrical groove 231 is less than the radius of the second cylindrical groove 232. The throttle groove 23 is formed by the cooperation of the first cylindrical groove 231 and the second cylindrical groove 232. The smaller circular opening of the first cylindrical groove 231 can provide a more precise flow regulation ability; while the larger circular opening of the second cylindrical groove 232 has a larger flow-through area, which can provide a larger flow-through ability when the spool valve 20 has a large displacement, and can compensate the pressure formed by the movement of the spool valve 20 more quickly, stably and reliably.

[0040] Among them, regarding other related descriptions:

[0041] Specifically, as Figure 3 shown, in the schematic diagram, P1 corresponds to the oil inlet chamber 13, P2 corresponds to the oil outlet chamber 14; LS corresponds to the load feedback chamber 15.

[0042] In the present invention, specific examples are used to illustrate the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A control unit for automatic pressure compensation, characterized in that: It includes a valve body and a slide valve; A sliding channel is arranged in the valve body, and a push chamber, an oil inlet chamber, an oil outlet chamber and a load feedback chamber connected to the sliding channel are arranged in sequence along the axial direction of the sliding channel; The slide valve is slidably disposed in the slide channel, and the slide valve separates the push chamber, the oil inlet chamber, the oil outlet chamber and the load feedback chamber; The slide valve is provided with a resting groove at one end of the load feedback chamber, a spring is provided in the resting groove, and the other end of the spring abuts against the end of the corresponding side of the sliding channel; The slide valve is provided with an annular ridge, and the slide valve on both sides of the annular ridge is provided with a first annular groove and a second annular groove, the first annular groove is communicated with the oil inlet chamber, and the second annular groove is communicated with the oil outlet chamber; the annular ridge is provided with a plurality of throttling grooves for communicating the oil inlet chamber with the oil outlet chamber; A communication channel is provided inside the slide valve, one end of which is open and communicates with the push chamber, and a damper is provided inside the communication channel; and a plurality of through holes are provided at the other end of the communication channel, and each of the through holes is communicated with the oil outlet chamber; The valve body is provided with an oil outlet channel, one end of the oil outlet channel is communicated with the oil outlet cavity, and the other end of the oil outlet channel is used to communicate with the oil inlet of the multi-way valve; The valve body is provided with a load channel, the load channel is communicated with the load hole, and the load channel can be communicated with the load feedback chamber.

2. The automatic pressure compensation control unit according to claim 1, characterized in that: A plurality of pressure equalizing grooves are arranged on a portion where the outer wall of the sliding valve contacts the inner wall of the sliding channel.

3. The automatic pressure compensation control unit according to claim 1, characterized in that: One end of the sliding channel is arranged as a mounting opening, and the mounting opening is sealed with a sealing screw plug.

4. The automatic pressure compensation control unit according to claim 1, characterized in that: The throttling groove includes a first cylindrical groove and a second cylindrical groove; The axis of the first cylindrical groove is parallel to the axis of the second cylindrical groove, and the first cylindrical groove is closer to the oil inlet cavity than the second cylindrical groove; the inner diameter of the first cylindrical groove is smaller than the inner diameter of the second cylindrical groove; The distance between the axis of the first cylindrical groove and the axis of the second cylindrical groove is less than the sum of the radius of the first cylindrical groove and the radius of the second cylindrical groove; The openings of the first cylindrical groove and the second cylindrical groove are in communication, and both can be in communication with the oil inlet chamber; The side of the second cylindrical groove away from the first cylindrical groove is connected to the oil outlet cavity, and the distance between the opening of the second cylindrical groove for communicating with the oil outlet cavity and the opening of the second cylindrical groove for communicating with the first cylindrical groove is smaller than the radius of the second cylindrical groove.

5. The automatic pressure compensation control unit according to claim 1, characterized in that: A limiting groove is arranged in the load feedback cavity corresponding to one end of the spring, and one end of the spring away from the slide valve is located in the limiting groove.

6. The automatic pressure compensation control unit according to claim 1, characterized in that: The load channel includes a first straight channel and a second straight channel; One end opening of the first straight channel is communicated with the load feedback chamber, and the other end opening of the first straight channel is blocked by a first plug; One end opening of the second straight channel is communicated with the load hole, and one end opening of the second straight channel is blocked by a second plug; The first straight channel and the second straight channel are cross-connected.

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