Prefill valve structure

Abstract

The utility model discloses a prefill valve structure and relates to the technical field of prefill valves. The prefill valve structure comprises a valve body, a valve element part, a piston part and an oil way driving assembly. An oil conveying cavity and a driving cavity which are independent of each other are arranged in the valve body, and the valve element piece is connected into the oil conveying cavity in a sliding mode. The piston piece is connected into the driving cavity in a sliding mode. The piston piece divides the driving cavity into a first cavity and a second cavity which are independent of each other, and the piston piece is connected with the valve element piece. The oil way driving assembly is used for injecting driving oil into or discharging driving oil out of the first cavity. According to the technical scheme provided by the utility model, hydraulic oil can be slowly injected into the oil cylinder, and quick response and closing can be realized to reduce waiting delay time.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid filling valves, in particular to a liquid filling valve structure. Background Art

[0002] Filling valves are widely used in machinery and equipment such as forging machines, high-speed punching machines, presses, and injection molding machines. They are primarily used to inject hydraulic oil from an accumulator into the cylinder of the mechanical equipment to ensure efficient operation. A typical filling valve consists of a valve body and a spool member, which is equipped with an oil inlet and an oil outlet. During operation, the internal pressure of the accumulator is adjusted. When the accumulator pressure exceeds the pressure of the cylinder, the pressure differential causes the spool member to displace relative to the valve body, opening the oil inlet and opening, thereby connecting the two holes. Hydraulic oil flows from the accumulator through the filling valve's oil inlet and outlet holes and into the cylinder, filling the cylinder. When the accumulator pressure falls below the cylinder pressure, a negative pressure differential forms within the accumulator, causing the spool member to displace relative to the valve body and close the oil inlet, isolating the connection between the two holes and stopping the filling of the cylinder.

[0003] In the prior art, on the one hand, when the filling valve is used to fill the cylinder with oil, the hydraulic oil will be quickly injected into the cylinder. This process will produce a flow impact on the rear chamber of the cylinder, thereby affecting the smoothness of the cylinder movement; on the other hand, the closing of the filling valve is achieved by adjusting the pressure difference between the accumulator and the cylinder. That is to say, the closing of the filling valve is passive, and the passive closing method will cause a certain waiting lag time when the filling valve is closed, that is, the filling valve cannot respond quickly to close.

[0004] Based on the above reasons, there is an urgent need for a new type of filling valve that can slowly inject hydraulic oil into the cylinder and quickly respond to closing to reduce waiting lag time.

[0005] It should be noted that the above content is only used to assist in understanding the technical solution of the present utility model, and does not mean that the above content is admitted to be prior art. Utility Model Content

[0006] The main purpose of the utility model is to propose a filling valve structure, which aims to achieve the goal of slowly injecting hydraulic oil into the interior of the oil cylinder and quickly responding to closing to reduce waiting lag time.

[0007] In order to achieve the above-mentioned purpose, the utility model proposes a liquid filling valve structure;

[0008] Specifically, the filling valve structure includes:

[0009] The valve body is provided with an independent oil delivery chamber and a drive chamber inside the valve body, the oil delivery chamber is used as a flow space for hydraulic oil; the oil delivery chamber is connected to an oil inlet hole and an oil outlet hole, wherein the oil inlet hole is used to communicate with the accumulator, and the oil outlet hole is used to communicate with the oil cylinder;

[0010] a valve core member, the valve core member being slidably connected to the oil delivery chamber;

[0011] a piston member, the piston member being slidably connected to the drive chamber; the piston member dividing the drive chamber into a first chamber and a second chamber that are independent of each other, wherein the first chamber is located on a side of the second chamber away from the oil delivery chamber; the piston member and the valve core member are interconnected;

[0012] an oil circuit drive assembly, the oil circuit drive assembly being used to inject or discharge drive oil into the first chamber;

[0013] When the oil circuit driving assembly injects the driving oil into the first chamber, the piston moves toward the second chamber and drives the valve core to move toward the oil inlet hole to close the oil inlet hole;

[0014] When the oil circuit drive assembly performs the operation of discharging the drive oil from the first chamber, the piston member moves toward the first chamber and drives the valve core member to move away from the oil inlet hole to open the oil inlet hole. The movement speed of the valve core member at this time is defined as a first speed. At the same time, when the valve core member is driven by the pressure of the accumulator to move away from the oil inlet hole to open the oil inlet hole, the movement speed of the valve core member at this time is defined as a second speed. The first speed is slower than the second speed.

[0015] In one embodiment, the valve body includes a valve body part and a valve body base, and the valve body part and the valve body base are detachably sealed; the oil inlet hole and the oil outlet hole are arranged on the valve body part; the valve body base is provided with a driving oil hole, and the oil circuit drive assembly is connected to the first chamber through the driving oil hole.

[0016] In one embodiment, the oil circuit drive assembly includes a drive oil control device, the drive oil control device being used to inject or discharge the drive oil into or out of the first chamber;

[0017] Furthermore, the oil circuit drive assembly further comprises a throttling device, both ends of which are connected to the first chamber and the drive oil control device respectively; wherein the throttling device is used to measure the flow rate of the drive oil;

[0018] Furthermore, the oil circuit drive assembly further includes a one-way valve, which is arranged in parallel with the throttling device; the passage direction of the one-way valve points to the driving oil control device.

[0019] In one embodiment, the oil cylinder is provided with a pressure sensor and / or a displacement sensor, and the pressure sensor and / or the displacement sensor are electrically connected to the driving oil control device via a controller.

[0020] In one embodiment, a piston cavity is provided inside the piston member, a piston spring is provided inside the piston cavity, and both ends of the piston spring are respectively connected to the piston member and the first chamber; wherein the direction of the elastic force of the piston spring is toward a direction away from the oil inlet hole.

[0021] In one embodiment, a first groove is provided in an annular shape on the outer side of the piston member, a first sealing ring is installed in the first groove, and the first sealing ring is in sealing contact with the inner side of the driving chamber.

[0022] In one embodiment, a valve core cavity is provided inside the valve core component, a valve core spring is provided inside the valve core cavity, and both ends of the valve core spring are respectively connected to the valve core component and the piston component; wherein the direction of the elastic force of the valve core spring is toward a direction away from the oil inlet hole.

[0023] In one embodiment, a plurality of oil through holes are opened on the side of the valve core member, and the oil through holes are connected with the oil delivery chamber and the inner cavity of the valve core.

[0024] In one embodiment, a guide sleeve is fixedly provided inside the valve body, and the guide sleeve is located between the oil delivery chamber and the drive chamber; a guide hole is provided through the middle of the guide sleeve, and at least part of the valve core member and at least part of the piston member are slidably connected to the guide hole.

[0025] In one embodiment, a second groove is provided in an annular shape on the outer side of the guide sleeve, a second sealing ring is installed in the second groove, and the second sealing ring is sealed and fitted with the inner side of the valve body.

[0026] In one embodiment, a plurality of third grooves are annularly provided on the outer side of the valve core member and / or the piston member, and the plurality of third grooves are distributed at intervals along the axis of the guide hole.

[0027] In one embodiment, a valve seat ring with an annular structure is installed at the oil inlet hole, and when the valve core member closes the oil inlet hole, the valve core member and the valve seat ring contact each other; and the end of the valve core member for contacting the valve seat ring is provided with a first chamfer, and the end of the valve seat ring for contacting the valve core member is provided with a second chamfer, and the inclination angle of the first chamfer is smaller than the inclination angle of the second chamfer.

[0028] In one embodiment, the accumulator is provided with an oil filling hole, and the oil filling hole of the accumulator is connected to the oil inlet hole of the valve body through a first flow channel, wherein the aperture of the first flow channel is larger than the aperture of the oil filling hole.

[0029] In one embodiment, the oil outlet hole is directly connected to the oil cylinder; or, the filling valve structure includes a second flow channel, and the oil outlet hole is indirectly connected to the oil cylinder through the second flow channel.

[0030] The technical solution of the present invention is to arrange the interior of the valve body into independent oil delivery chambers and driving chambers, and use the oil delivery chamber as the flow space of the hydraulic oil. During operation, the hydraulic oil flows out of the accumulator and passes through the oil inlet hole, the oil delivery chamber and the oil outlet hole in sequence and finally flows into the oil cylinder; at the same time, a piston member is arranged in the driving chamber of the valve body, and the driving chamber is divided into a first chamber and a second chamber that are independent of each other by the piston member. When the piston member is located in the driving chamber and slides, the spatial volumes of the first chamber and the second chamber change, thereby causing the internal pressure of the second chamber to change accordingly; the piston member and the valve core member are connected to each other to ensure that the valve core member can be moved while the piston member moves.

[0031] When the filling valve is closed to stop the oil injection into the cylinder, the oil circuit drive assembly is used to inject drive oil into the first chamber. As the volume of the first chamber increases due to the injection of drive oil, it pushes the piston member toward the second chamber. The piston member then drives the valve core member toward the oil inlet hole, closing the oil inlet hole and isolating the oil inlet hole from the oil outlet hole. Because the closing process of the filling valve is controlled by the oil circuit drive assembly, it does not rely on adjusting the pressure difference between the accumulator and the oil cylinder, which means it is an active closing method. The use of active closing method can achieve a fast response closing to reduce waiting lag time.

[0032] When the filling valve is opened to fill the oil cylinder with oil, the oil circuit drive assembly is used to discharge the driving oil from the first chamber. At this time, the internal pressure of the first chamber is reduced due to the discharge of the driving oil, so that the internal pressure of the second chamber is greater than the internal pressure of the first chamber. The pressure difference between the first chamber and the second chamber is used to push the piston member toward the first chamber; the piston member then drives the valve core member to move away from the oil inlet hole to open the oil inlet hole, thereby connecting the oil inlet hole and the oil outlet hole to each other, and the movement speed of the valve core member at this time is defined as a first speed; at the same time, when the valve core member is driven by the pressure of the accumulator to move away from the oil inlet hole to open the oil inlet hole, the movement speed of the valve core member at this time is defined as a second speed; wherein the first speed is slower than the second speed. That is, compared with the prior art method of using the pressure of the accumulator to drive the movement of the valve core member, the present application drives the movement of the valve core member by discharging the driving oil from the first chamber. The movement of the valve core member away from the oil inlet hole is slower, that is, the opening speed of the filling valve is slow, so that the hydraulic oil can be slowly injected into the interior of the oil cylinder to reduce the flow impact on the rear chamber of the oil cylinder and avoid affecting the smoothness of the oil cylinder movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 This is a schematic diagram of the overall structure of an embodiment of a liquid filling valve structure provided by the utility model;

[0035] Figure 2 for Figure 1 A partial enlarged view of point A in the middle;

[0036] Figure 3 This is a structural diagram of the valve body in an embodiment of the liquid filling valve structure provided by the present invention (the liquid filling valve is in the open state);

[0037] Figure 4 This is a structural diagram of the valve body in an embodiment of the liquid filling valve structure provided by the present invention (the liquid filling valve is in an actively closed state);

[0038] Figure 5 This is a structural schematic diagram of the valve body in an embodiment of the liquid filling valve structure provided by the present invention (the liquid filling valve is in a passive closed state).

[0039] Description of reference numerals:

[0040] 100, valve body; 110, oil inlet hole; 120, oil outlet hole; 130, valve body; 140, valve body base; 150, drive oil hole; 160, guide sleeve; 161, guide hole; 162, second groove; 163, second sealing ring; 170, valve seat ring; 200, oil delivery chamber; 300, drive chamber; 310, first chamber; 320, second chamber; 400, valve core; 410, valve core inner cavity; 420, valve core spring; 43 0, oil hole; 440, third groove; 500, piston member; 510, piston inner cavity; 520, piston spring; 530, first groove; 600, oil circuit drive assembly; 610, drive oil control device; 620, throttling device; 630, one-way valve; 700, accumulator; 710, oil filling hole; 800, oil cylinder; 810, pressure sensor; 820, displacement sensor; 910, controller; 920, first flow channel; 930, second flow channel;

[0041] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0042] The following is a clear and complete description of the technical solutions of the present invention in conjunction with the accompanying drawings. Obviously, the description is only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0043] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0044] In addition, it should be noted that the descriptions of "first", "second", etc. in this utility model are for descriptive purposes only and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0045] In the prior art, since the hydraulic oil is quickly injected into the cylinder when the filling valve is filling the cylinder, this process will produce a flow impact on the rear chamber of the cylinder, thereby affecting the smoothness of the cylinder movement; at the same time, the closing of the filling valve is achieved by adjusting the pressure difference between the accumulator and the cylinder, that is, the closing of the filling valve is passive, and the passive closing method will cause a certain waiting lag time when the filling valve is closed, that is, the filling valve cannot respond quickly to close.

[0046] In order to solve the above technical problems, the utility model proposes a liquid filling valve structure.

[0047] See also Figure 1-4 In one embodiment of the present invention, the filling valve structure includes:

[0048] The valve body 100 has an independent oil delivery chamber 200 and a drive chamber 300 disposed therein. The oil delivery chamber 200 is used as a flow space for hydraulic oil. The oil delivery chamber 200 is connected to an oil inlet hole 110 and an oil outlet hole 120. The oil inlet hole 110 is used to communicate with the accumulator 700, and the oil outlet hole 120 is used to communicate with the oil cylinder 800.

[0049] The valve core member 400 is slidably connected to the oil delivery chamber 200;

[0050] The piston member 500 is slidably connected to the drive chamber 300. The piston member 500 divides the drive chamber 300 into a first chamber 310 and a second chamber 320, which are independent of each other. The first chamber 310 is located on a side of the second chamber 320 away from the oil delivery chamber 200. The piston member 500 is interconnected with the valve core member 400.

[0051] The oil circuit driving assembly 600 is used to inject or discharge driving oil into the first chamber 310;

[0052] When the oil circuit driving assembly 600 injects driving oil into the first chamber 310, the piston 500 moves toward the second chamber 320 and drives the valve core 400 to move toward the oil inlet hole 110 to close the oil inlet hole 110.

[0053] When the oil circuit drive assembly 600 performs the operation of discharging the driving oil from the first chamber 310, the piston member 500 moves toward the first chamber 310 and drives the valve core member 400 to move away from the oil inlet hole 110 to open the oil inlet hole 110. The movement speed of the valve core member 400 at this time is defined as the first speed; at the same time, when the valve core member 400 is driven by the pressure of the accumulator 700 to move away from the oil inlet hole 110 to open the oil inlet hole 110, the movement speed of the valve core member 400 at this time is defined as the second speed; wherein the first speed is slower than the second speed.

[0054] The technical solution of the present invention is to set the interior of the valve body 100 into an independent oil delivery chamber 200 and a driving chamber 300, and use the oil delivery chamber 200 as the flow space of the hydraulic oil. During operation, the hydraulic oil flows out of the accumulator 700 and passes through the oil inlet hole 110, the oil delivery chamber 200 and the oil outlet hole 120 in sequence and finally flows into the oil cylinder 800; at the same time, a piston member 500 is set in the driving chamber 300 of the valve body 100, and the driving chamber 300 is divided into a first chamber 310 and a second chamber 320 that are independent of each other. When the piston member 500 is located in the driving chamber 300 and slides, the spatial volume of the first chamber 310 and the second chamber 320 changes, thereby causing the internal pressure of the second chamber 320 to change accordingly; at the same time, the piston member 500 and the valve core member 400 are connected to each other to ensure that the piston member 500 can drive the valve core member 400 to move simultaneously.

[0055] Reference Attachment Figure 4 When the filling valve is closed to stop the oil injection operation into the oil cylinder 800, the oil circuit drive assembly 600 is used to inject driving oil into the first chamber 310. As the volume of the first chamber 310 increases due to the injection of driving oil, it pushes the piston member 500 toward the second chamber 320. The piston member 500 then drives the valve core member 400 toward the oil inlet hole 110 to close the oil inlet hole 110, thereby isolating the oil inlet hole 110 from the oil outlet hole 120. Because the above-mentioned filling valve closing process is controlled by the oil circuit drive assembly 600, it does not rely on adjusting the pressure difference between the accumulator 700 and the oil cylinder 800. In other words, it is an active closing method. The use of active closing method can achieve a fast response closing to reduce waiting lag time.

[0056] Reference Attachment Figure 3When the charging valve is opened to fill the oil cylinder 800 with oil, the oil circuit drive assembly 600 is used to discharge the driving oil from the first chamber 310. At this time, the internal pressure of the first chamber 310 decreases due to the discharge of the driving oil, causing the internal pressure of the second chamber 320 to be greater than the internal pressure of the first chamber 310. The pressure difference between the first chamber 310 and the second chamber 320 is used to push the piston member 500 toward the first chamber 310. The piston member 500 then drives the valve core member 400 to move away from the oil inlet hole 110 to open the oil inlet hole 110, thereby connecting the oil inlet hole 110 with the oil outlet hole 120. The movement speed of the valve core member 400 at this time is defined as a first speed. At the same time, when the valve core member 400 is driven by the pressure of the accumulator 700 to move away from the oil inlet hole 110 to open the oil inlet hole 110, the movement speed of the valve core member 400 at this time is defined as a second speed. The first speed is slower than the second speed. That is, compared with the prior art method of using the pressure of the accumulator 700 to drive the movement of the valve core member 400, the present application drives the movement of the valve core member 400 by discharging the driving oil from the first chamber 310. The movement of the valve core member 400 away from the oil inlet hole 110 is slower, that is, the opening speed of the filling valve is slow, so that the hydraulic oil can be slowly injected into the interior of the cylinder 800, so as to reduce the flow impact on the rear cavity of the cylinder 800 and avoid affecting the smoothness of the movement of the cylinder 800.

[0057] It can be understood that in order to ensure that the first speed is slower than the second speed, this can be achieved by controlling the driving oil discharge power of the oil circuit drive component 600; specifically, by reducing the driving oil discharge power of the oil circuit drive component 600, the discharge operation of the driving oil from the first chamber 310 is slowed down, and the movement of the valve core component 400 away from the oil inlet hole 110 is slowed down, so as to achieve the purpose of the first speed being slower than the second speed.

[0058] The second chamber 320 is equipped with a pressure regulating device (not shown in the drawings) that is used to adaptively adjust the internal pressure of the second chamber 320. With this arrangement, as mentioned above, when the oil circuit drive assembly 600 injects or drains drive oil into or out of the first chamber 310, the volume of the first chamber 310 changes. Since the overall volume of the drive chamber 300 remains unchanged, changes in the volume of the second chamber 320 also cause changes in the volume of the first chamber 310. To prevent changes in the internal pressure of the second chamber 320 due to this volume change, which could hinder the movement of the piston 500 between the first and second chambers 310, this embodiment employs a pressure regulating device in the second chamber 320 to adaptively adjust the internal pressure of the second chamber 320, thereby ensuring smooth and unimpeded movement of the piston 500 between the first and second chambers 310, 320. The regulating medium of the pressure regulating device can be either gas or liquid, and this is not specifically limited in this application.

[0059] Specifically, refer to the attached Figure 1 The valve body 100 includes a valve member 130 and a valve base 140, which are detachably and hermetically connected. The oil inlet 110 and the oil outlet 120 are provided on the valve member 130. The valve base 140 is provided with a drive oil hole 150, through which the oil circuit drive assembly 600 is connected to the first chamber 310. This configuration, which configures the valve body 100 to consist of the valve member 130 and the valve base 140, facilitates assembly of components such as the valve core 400, the piston 500, and the guide sleeve 160 therein, and also facilitates maintenance and cleaning of the interior of the valve body 100.

[0060] Among them, refer to the attached Figure 1 There are many specific structures of the oil circuit drive assembly 600. In this embodiment, the oil circuit drive assembly 600 includes a drive oil control device 610, which is used to inject or discharge the drive oil into or out of the first chamber 310. In this arrangement, the drive oil control device 610 is used as a mobile power source for the drive oil to inject or discharge the drive oil into or out of the first chamber 310, ensuring the smooth implementation of the technical solution of the present application, with a simple structure and strong practicality.

[0061] Furthermore, the oil circuit drive assembly 600 also includes a throttling device 620, the two ends of which are connected to the first chamber 310 and the drive oil control device 610, respectively. The throttling device 620 is used to measure the flow rate of the drive oil. In this configuration, the throttling device 620, also known as a throttling flowmeter, generates a static pressure difference by increasing the flow rate and decreasing the static pressure, thereby measuring the fluid flow rate. In this embodiment, by providing the throttling device 620 between the first chamber 310 and the drive oil control device 610, it is possible to effectively measure the flow rate of the drive oil into or out of the first chamber 310, thereby facilitating accurate control of the opening and closing of the filling valve.

[0062] Furthermore, the oil circuit drive assembly 600 also includes a one-way valve 630, which is arranged in parallel with the throttling device 620; the flow direction of the one-way valve 630 points to the driving oil control device 610. With this arrangement, studying the injection amount of the driving oil rather than the discharge amount of the driving oil can be more helpful in accurately controlling the opening and closing degree of the filling valve; therefore, the one-way valve 630 and the throttling device 620 are designed to be in a parallel structure. When the driving oil is discharged, the driving oil can simultaneously flow through the throttling device 620 and the branch where the one-way valve 630 is located to the driving oil control device 610; when the driving oil is injected, the driving oil can only flow through the branch where the throttling device 620 is located to the driving oil control device 610. At this time, the flow value measured by the throttling device 620 is the injection amount of the driving oil.

[0063] Furthermore, the oil cylinder 800 is provided with a pressure sensor 810 and / or a displacement sensor 820, and the pressure sensor 810 and / or the displacement sensor 820 are electrically connected to the drive oil control device 610 via a controller 910. With such a configuration, pressure feedback is outputted via the pressure sensor, and displacement feedback is outputted via the displacement sensor. When the pressure feedback value or the displacement feedback value of the oil cylinder 800 reaches a preset value, the drive oil control device 610 is used to promptly drive the valve core member 400 to perform a closing operation to prevent the oil cylinder 800 from being damaged due to excessive pressure or excessive displacement. The controller 910 can be a common PLC controller, which can be internally programmed to drive the drive oil control device 610 to operate when the pressure value or the displacement value of the oil cylinder 800 reaches a preset value. Since the PLC controller belongs to the prior art, this application will not further elaborate on its structural principle.

[0064] As a preferred embodiment of the above-mentioned embodiment, the piston member 500 is provided with a piston cavity 510, and a piston spring 520 is provided within the piston cavity 510. The two ends of the piston spring 520 are connected to the piston member 500 and the first chamber 310, respectively. The elastic force of the piston spring 520 is directed away from the oil inlet hole 110. In this configuration, the piston spring 520 is provided in the piston cavity 510 of the piston member 500. When the driving oil is discharged from the first chamber 310, the elastic force of the piston spring 520 drives the piston member 500 away from the oil inlet hole 110, that is, drives the piston member 500 toward the first chamber. In this way, under the dual action of the pressure difference between the first chamber 310 and the second chamber 320 and the piston spring 520, the piston member 500 can be reliably moved toward the first chamber 310, so that the valve core member 400 can open the oil inlet hole 110, ensuring the smooth implementation of the technical solution of this application.

[0065] Furthermore, a first groove 530 is annularly formed on the outer side of the piston 500. A first sealing ring (not shown) is mounted in the first groove 530 and seals against the inner side of the drive chamber 300. This arrangement ensures the isolation of the first chamber 310 and the second chamber 320 through the sealing action of the first sealing ring, preventing the drive oil from flowing into the second chamber 320 through the gap between the piston 500 and the valve body 100, potentially causing leakage.

[0066] As a preferred solution of the above embodiment, refer to the attached Figure 5 The valve core component 400 is provided with a valve core inner cavity 410, and the valve core spring 420 is provided inside the valve core inner cavity 410. The two ends of the valve core spring 420 are respectively connected to the valve core component 400 and the piston component 500; wherein the direction of the elastic force of the valve core spring 420 is in the direction away from the oil inlet hole 110. In this way, by providing the valve core spring 420 in the valve core inner cavity 410 of the valve core component 400, the passive closing of the filling valve is achieved. It can be understood that when the pressure value of the accumulator 700 is lower than the pressure value of the oil cylinder 800, a negative pressure difference is formed inside the accumulator 700. The pressure difference will drive the valve core component 400 to overcome the elastic force of the valve core spring 420 and displace relative to the valve body 100 and close the oil inlet hole 110, thereby achieving the purpose of passive closing. In other words, the filling valve of the present application can achieve active closing and passive closing at the same time, so as to more effectively adapt to various operating scenarios and improve applicability.

[0067] Furthermore, a plurality of oil holes 430 are provided on the side of the valve core member 400, which communicate with the oil delivery chamber 200 and the valve core inner cavity 410. This arrangement is to prevent the valve core inner cavity 410 from forming a vacuum state due to the seal, thereby hindering the passive closing of the valve core member 400. In this embodiment, the plurality of oil holes 430 are provided on the side of the valve core member 400. Through these oil holes 430, the internal pressure of the valve core inner cavity 410 is kept substantially consistent with the external pressure of the valve core member 400, thereby preventing the valve core inner cavity 410 from forming a vacuum state due to the seal, and ensuring that the valve core member 400 can operate smoothly when passively closing.

[0068] As a preferred embodiment of the above embodiment, a guide sleeve 160 is fixedly disposed within the valve body 100 and positioned between the oil delivery chamber 200 and the drive chamber 300. A guide hole 161 is defined through the middle of the guide sleeve 160, through which at least a portion of the valve core member 400 and at least a portion of the piston member 500 are slidably connected. This arrangement ensures that the valve core member 400 and the piston member 500 can slide along a predetermined path, guided by the guide sleeve 160.

[0069] Furthermore, a second groove 162 is annularly formed on the outer side of the guide sleeve 160. A second sealing ring 163 is mounted in the second groove 162. The second sealing ring 163 is configured to seal against the inner side of the valve body 100. This arrangement ensures that the oil delivery chamber 200 and the second chamber 320 are isolated from each other through the sealing effect of the second sealing ring 163, preventing hydraulic oil from flowing into the second chamber 320 through the gap between the guide sleeve 160 and the valve body 100, thereby causing hydraulic oil leakage.

[0070] Furthermore, a plurality of third grooves 440 are annularly disposed on the outer sides of the valve core member 400 and / or the piston member 500, and are spaced apart along the axis of the guide hole 161. When the valve core member 400 and the piston member 500 slide along the guide sleeve 160 to the oil delivery chamber 200, some hydraulic oil adheres to the third grooves 440 of the valve core member 400 and / or the piston member 500. Due to the lubricating properties of the hydraulic oil, it acts as a lubricant between the valve core member 400 and the piston member 500 and the guide sleeve 160, thereby ensuring smooth movement of the valve core member 400 and the piston member 500 when sliding relative to the guide sleeve 160.

[0071] As a preferred embodiment of the above embodiment, an annular valve seat ring 170 is installed at the oil inlet hole 110. When the valve core member 400 closes the oil inlet hole 110, the valve core member 400 and the valve seat ring 170 contact each other. In addition, the end of the valve core member 400 that contacts the valve seat ring 170 is provided with a first chamfer, and the end of the valve seat ring 170 that contacts the valve core member 400 is provided with a second chamfer, and the inclination angle of the first chamfer is smaller than the inclination angle of the second chamfer. In this arrangement, by setting the first chamfer and the second chamfer to have different inclination angles, while ensuring that the valve core member 400 and the valve seat ring 170 are in contact and connected to ensure the closure of the oil inlet hole 110, the valve core member 400 and the valve seat ring 170 are prevented from getting stuck due to friction or other reasons, making it difficult to separate the two.

[0072] As a preferred embodiment of the above-described embodiment, the accumulator 700 is provided with an oil filling hole 710. The oil filling hole 710 of the accumulator 700 and the oil inlet hole 110 of the valve body 100 are interconnected via a first flow channel 920. The aperture of the first flow channel 920 is larger than that of the oil filling hole 710. This configuration is based on the consideration that if the aperture of the first flow channel 920 is too small, hydraulic oil will not flow smoothly from the accumulator 700 to the charging valve. Based on this consideration, the aperture of the first flow channel 920 is specifically specified in this embodiment to ensure smooth flow of hydraulic oil from the accumulator 700 to the charging valve. In this embodiment, the aperture of the first flow channel 920 is at least 1.2 times the aperture of the oil filling hole 710.

[0073] As a preferred solution of the above embodiment, the oil outlet hole 120 is directly connected to the oil cylinder 800; or, the filling valve structure includes a second flow channel 930, and the oil outlet hole 120 and the oil cylinder 800 are indirectly connected via the second flow channel 930; this arrangement allows operators to select a suitable connection method for the oil outlet hole 120 and the oil cylinder 800 according to actual on-site conditions, which helps to improve applicability.

[0074] It should be noted that other contents of the liquid filling valve structure disclosed in the present utility model are prior art and will not be described in detail here.

[0075] The above are only optional embodiments of the present invention and do not limit the patent scope of the present invention. Any direct / indirect application of the present invention in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A filling valve structure, characterized in that: The filling valve structure includes: The valve body is provided with an independent oil delivery chamber and a drive chamber inside the valve body, the oil delivery chamber is used as a flow space for hydraulic oil; the oil delivery chamber is connected to an oil inlet hole and an oil outlet hole, wherein the oil inlet hole is used to communicate with the accumulator, and the oil outlet hole is used to communicate with the oil cylinder; a valve core member, the valve core member being slidably connected to the oil delivery chamber; a piston member, the piston member being slidably connected to the drive chamber; the piston member dividing the drive chamber into a first chamber and a second chamber that are independent of each other, wherein the first chamber is located on a side of the second chamber away from the oil delivery chamber; the piston member and the valve core member are interconnected; an oil circuit drive assembly, the oil circuit drive assembly being used to inject or discharge drive oil into the first chamber; When the oil circuit driving assembly injects the driving oil into the first chamber, the piston moves toward the second chamber and drives the valve core to move toward the oil inlet hole to close the oil inlet hole; When the oil circuit drive assembly performs the operation of discharging the drive oil from the first chamber, the piston member moves toward the first chamber and drives the valve core member to move away from the oil inlet hole to open the oil inlet hole. The movement speed of the valve core member at this time is defined as a first speed. At the same time, when the valve core member is driven by the pressure of the accumulator to move away from the oil inlet hole to open the oil inlet hole, the movement speed of the valve core member at this time is defined as a second speed. The first speed is slower than the second speed.

2. The liquid filling valve structure according to claim 1, characterized in that: The valve body includes a valve body part and a valve body base, and the valve body part and the valve body base are detachably sealed; the oil inlet hole and the oil outlet hole are arranged on the valve body part; the valve body base is provided with a driving oil hole, and the oil circuit driving assembly is connected to the first chamber through the driving oil hole.

3. The liquid filling valve structure according to claim 1, wherein: The oil circuit drive assembly includes a drive oil control device, which is used to inject or discharge drive oil into or out of the first chamber; Furthermore, the oil circuit drive assembly further comprises a throttling device, both ends of which are connected to the first chamber and the drive oil control device respectively; wherein the throttling device is used to measure the flow rate of the drive oil; Furthermore, the oil circuit drive assembly further includes a one-way valve, which is arranged in parallel with the throttling device; the passage direction of the one-way valve points to the drive oil control device.

4. The liquid filling valve structure according to claim 3, characterized in that: The oil cylinder is provided with a pressure sensor and / or a displacement sensor, and the pressure sensor and / or the displacement sensor are electrically connected to the driving oil control device through a controller.

5. The liquid filling valve structure according to claim 1, wherein: A piston cavity is provided inside the piston member, a piston spring is provided inside the piston cavity, and two ends of the piston spring are respectively connected to the piston member and the first chamber; wherein the direction of the elastic force of the piston spring is toward a direction away from the oil inlet hole.

6. The liquid filling valve structure according to claim 5, characterized in that: A first groove is provided in an annular manner on the outer side of the piston member, a first sealing ring is installed in the first groove, and the first sealing ring is in sealing contact with the inner side of the driving chamber.

7. The liquid filling valve structure according to claim 1, wherein: A valve core cavity is provided inside the valve core component, a valve core spring is provided inside the valve core cavity, and both ends of the valve core spring are respectively connected to the valve core component and the piston component; wherein the direction of the elastic force of the valve core spring is toward the direction away from the oil inlet hole.

8. The liquid filling valve structure according to claim 7, characterized in that: A plurality of oil through holes are provided on the side of the valve core member, and the oil through holes are connected with the oil delivery chamber and the inner cavity of the valve core.

9. The liquid filling valve structure according to claim 1, wherein: A guide sleeve is fixedly provided inside the valve body, and the guide sleeve is located between the oil delivery chamber and the drive chamber; a guide hole is provided through the middle of the guide sleeve, and at least part of the valve core member and at least part of the piston member are slidably connected to the guide hole.

10. The liquid filling valve structure according to claim 9, characterized in that: The outer side of the guide sleeve is provided with a second groove in an annular shape, and a second sealing ring is installed in the second groove. The second sealing ring is sealed and fitted with the inner side of the valve body.

11. The liquid filling valve structure according to claim 9, wherein: A plurality of third grooves are annularly arranged on the outer side of the valve core member and / or the piston member, and the plurality of third grooves are distributed at intervals along the axis of the guide hole.

12. The liquid filling valve structure according to claim 1, wherein: A valve seat ring with an annular structure is installed at the oil inlet hole. When the valve core member closes the oil inlet hole, the valve core member and the valve seat ring are in contact with each other. Furthermore, the end of the valve core member for contacting the valve seat ring is provided with a first chamfer, and the end of the valve seat ring for contacting the valve core member is provided with a second chamfer, and the inclination angle of the first chamfer is smaller than the inclination angle of the second chamfer.

13. The liquid filling valve structure according to claim 1, wherein: The energy accumulator is provided with an oil filling hole, and the oil filling hole of the energy accumulator is communicated with the oil inlet hole of the valve body through a first flow channel, wherein the aperture of the first flow channel is larger than the aperture of the oil filling hole.

14. The liquid filling valve structure according to claim 1, wherein: The oil outlet hole is directly connected to the oil cylinder; or, the filling valve structure includes a second flow channel, and the oil outlet hole is indirectly connected to the oil cylinder through the second flow channel.

Images