Three-way proportional flow cartridge valve

Abstract

The embodiment of the specification discloses a three-way proportional flow cartridge valve, a pilot valve is an electromagnetic proportional reversing valve, and a main valve is a three-way flow cartridge valve; the electromagnetic proportional reversing valve comprises a first control oil way and a second control oil way. The three-way flow cartridge valve comprises a third control oil way and a fourth control oil way; the first control oil way is communicated with an upper cavity of the three-way flow cartridge valve through a third control oil way; the three-way flow cartridge valve comprises a main oil inlet, a working oil port and an unloading port; pilot oil injected into the upper cavity is used for controlling the main oil inlet to be communicated with the working oil port; the second control oil way is communicated with a lower cavity of the three-way flow cartridge valve through a fourth control oil way; the pilot oil injected into the lower cavity is used for controlling the main oil inlet to be communicated with the unloading opening. Due to the fact that the electromagnetic proportional directional valve is simple in structure and low in requirement for use scenes, the three-way proportional flow cartridge valve is low in industrial cost and good in industrial applicability.

Description

Technical Field

[0001] This application relates to the technical field of hydraulic control, and particularly to a three-way proportional flow cartridge valve. Background Art

[0002] The proportional flow cartridge valve is a control element used in a hydraulic system, which can adjust the fluid flow rate and is widely used in various hydraulic systems.

[0003] In practical applications, the proportional flow cartridge valve uses an electro-hydraulic servo valve as the pilot stage. Although the electro-hydraulic servo valve has high control accuracy, its manufacturing process is complex and the industrial cost is high. Moreover, due to the complex structure of the electro-hydraulic servo valve, it is not easy for the operating user to master. At the same time, the electro-hydraulic servo valve also has the disadvantages of large volume, large occupied space, high requirement for the cleanliness of the oil, easy to fail, and not easy to repair.

[0004] Based on this, how to provide a proportional flow cartridge valve with low industrial cost and easy to apply has become an urgent technical problem to be solved. Utility Model Content

[0005] The embodiments of this specification provide a three-way proportional flow cartridge valve to reduce the industrial cost and improve the industrial applicability.

[0006] To solve the above technical problems, the embodiments of this specification are implemented as follows:

[0007] A three-way proportional flow cartridge valve provided by the embodiments of this specification includes a pilot valve and a main valve; wherein, the pilot valve is an electromagnetic proportional reversing valve, and the main valve is a three-way flow cartridge valve;

[0008] The electromagnetic proportional reversing valve includes a first opening of a first control oil circuit and a first opening of a second control oil circuit;

[0009] The three-way flow cartridge valve includes a third control oil circuit and a fourth control oil circuit;

[0010] The first opening of the first control oil circuit is communicated with the upper cavity of the three-way flow cartridge valve through the third control oil circuit; the pilot oil injected into the upper cavity through the first control oil circuit is used to control the main oil inlet of the three-way flow cartridge valve to be communicated with the working oil port of the three-way flow cartridge valve;

[0011] The first opening of the second control oil circuit is communicated with the lower cavity of the three-way flow cartridge valve through the fourth control oil circuit; the pilot oil injected into the lower cavity through the second control oil circuit is used to control the main oil inlet of the three-way flow cartridge valve to be communicated with the unloading port of the three-way flow cartridge valve.

[0012] Optionally, the three-way flow cartridge valve further includes a pilot oil inlet oil path; the outlet of the pilot oil inlet oil path communicates with the inlet chamber of the electromagnetic proportional directional valve through the inlet of the electromagnetic proportional directional valve;

[0013] The electromagnetic proportional directional valve is configured to, when receiving an electrical signal, control the inlet chamber to communicate with the upper chamber through the second opening of the first control oil path;

[0014] When not receiving an electrical signal, control the inlet chamber to communicate with the lower chamber through the second opening of the second control oil path.

[0015] Optionally, the second opening of the first control oil path communicates with the first working chamber of the electromagnetic proportional directional valve; the second opening of the second control oil path communicates with the second working chamber of the electromagnetic proportional directional valve;

[0016] The inlet chamber communicates with the upper chamber through the second opening of the first control oil path, specifically: the inlet chamber communicates with the upper chamber through the first working chamber and the second opening of the first control oil path;

[0017] The inlet chamber communicates with the lower chamber through the second opening of the second control oil path, specifically: the inlet chamber communicates with the lower chamber through the second working chamber and the second opening of the second control oil path.

[0018] Optionally, the three-way flow cartridge valve further includes a pilot oil outlet oil path; the oil return chamber of the electromagnetic proportional directional valve communicates with the inlet of the pilot oil outlet oil path through the outlet of the electromagnetic proportional directional valve;

[0019] The electromagnetic proportional directional valve is configured to, when receiving an electrical signal, control the lower chamber to communicate with the oil return chamber through the second opening of the second control oil path;

[0020] When not receiving an electrical signal, control the upper chamber to communicate with the oil return chamber through the second opening of the first control oil path.

[0021] Optionally, the second opening of the first control oil path communicates with the first working chamber of the electromagnetic proportional directional valve; the second opening of the second control oil path communicates with the second working chamber of the electromagnetic proportional directional valve;

[0022] The lower chamber communicates with the oil return chamber through the second opening of the second control oil path, specifically:

[0023] The lower chamber communicates with the oil return chamber through the second opening of the second control oil path and the second working chamber;

[0024] The upper chamber communicates with the oil return chamber through the second opening of the first control oil path, specifically:

[0025] The upper cavity communicates with the oil return cavity through the second opening of the first control oil passage and the first working cavity.

[0026] Optionally, a first exhaust passage and a second exhaust passage are further included;

[0027] The first opening of the first exhaust passage and the first opening of the second exhaust passage are arranged on the three-way flow cartridge valve;

[0028] The second opening of the first exhaust passage is communicated with the first opening of the first control oil passage through the upper cavity;

[0029] The second opening of the second exhaust passage is communicated with the first opening of the second control oil passage through the lower cavity.

[0030] Optionally, the electro-hydraulic proportional directional valve further includes a pilot valve body, a pilot spool and a proportional electro-magnet;

[0031] The pilot spool is located inside the pilot valve body;

[0032] The proportional electro-magnet is located above the pilot valve body; the proportional electro-magnet is used to push the pilot spool to move inside the pilot valve body.

[0033] Optionally, a first pressure spring and a second pressure spring are arranged inside the pilot valve body; the first pressure spring is arranged above the pilot spool, and the second pressure spring is arranged below the pilot spool;

[0034] The first pressure spring and the second pressure spring are used to maintain the pilot spool at a first position inside the pilot valve body;

[0035] The proportional electro-magnet is located above the pilot valve body, specifically:

[0036] The push rod of the proportional electro-magnet passes through the first pressure spring and contacts the pilot spool.

[0037] Optionally, the main spool of the three-way flow cartridge valve is of a hollow structure, and the main oil inlet is arranged at the bottom of the main spool; the working oil port and the unloading port are both arranged in the circumferential direction of the main valve sleeve of the three-way flow cartridge valve; the unloading port is located above the working oil port;

[0038] A through hole is formed in the circumferential direction of the side wall of the main spool.

[0039] Optionally, a baffle is arranged inside the main spool, and the baffle is located above the through hole;

[0040] The baffle is used to control the main oil from flowing out of the through hole.

[0041] One embodiment of this specification achieves the following beneficial effects: The three-way proportional flow cartridge valve of the embodiment of this specification uses an electromagnetic proportional directional valve as the pilot valve. Since the electromagnetic proportional directional valve has a simple structure and low requirements for the usage scenario, the three-way proportional flow cartridge valve of the embodiment of this specification has a low industrial cost and good industrial applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0043] Figure 1 Structural diagram of a three-way proportional flow cartridge valve provided by an embodiment of this specification;

[0044] Figure 2 Side view of a three-way proportional flow cartridge valve provided by an embodiment of this specification;

[0045] Figure 3 Partial side view of a three-way proportional flow cartridge valve provided by an embodiment of this specification;

[0046] Figure 4 Hydraulic control schematic diagram of a three-way proportional flow cartridge valve provided by an embodiment of this specification;

[0047] Figure 5 Control flow chart of a three-way proportional flow cartridge valve provided by an embodiment of this specification. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0048] To make the objectives, technical solutions, and advantages of one or more embodiments of this specification clearer, the following will clearly and completely describe the technical solutions of one or more embodiments of this specification in conjunction with the specific embodiments and corresponding drawings of this specification. Obviously, the described embodiments are only some embodiments of this specification, rather than all embodiments. Based on the embodiments in this specification, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by one or more embodiments of this specification.

[0049] The following will, in conjunction with the drawings, detail the technical solutions provided by each embodiment of this specification.

[0050] To solve the defects in the prior art, the following embodiments are given in this solution:

[0051] Figure 1 This is a structural diagram of a three-way proportional flow cartridge valve provided by the embodiments of this specification. As Figure 1 shown, the three-way proportional flow cartridge valve may include a main valve and a pilot valve; among them, the main valve may be a three-way flow cartridge valve, and the pilot valve may be an electromagnetic proportional reversing valve.

[0052] The three-way flow cartridge valve may include a main spool 1, a main valve sleeve 2, a cover plate 3, a flange 4, a first displacement sensor 5, and a controller 6. Specifically, the main spool 1 may be arranged in the axial hole of the main valve sleeve 2, and the main valve sleeve 2 may be arranged in the axial hole of the cover plate 3; a flange 4 may be arranged above the cover plate 3, and a first displacement sensor 5 may be arranged in the axial hole of the flange 4. One end of the detection rod of the first displacement sensor 5 may be connected to the main spool 1, and the other end of the first displacement sensor 5 may be connected to the controller 6 above the flange 4; the controller 6 is used to receive the electrical signal input externally and the displacement amount of the main spool 1 detected by the first displacement sensor 5.

[0053] In the embodiments of this specification, in order to prevent the detection rod at one end of the first displacement sensor 5 from loosening and falling off, a lock nut can be used for gluing and locking, so as to ensure the detection stability of the first displacement sensor 5.

[0054] In the embodiments of this specification, the main spool 1 of the three-way flow cartridge valve may be of a hollow structure. Below the main spool 1 may be the main valve working chamber K, and the bottom of the main spool 1 may be the main oil inlet 7 of the three-way flow cartridge valve; in the circumferential direction of the main valve sleeve 2 of the three-way flow cartridge valve, a working oil port M and a relief port N may be arranged, and the relief port N may be located above the working oil port M; a through hole 8 may be opened in the circumferential direction of the side wall of the main spool 1.

[0055] Figure 2 This is a side view of a three-way proportional flow cartridge valve provided by the embodiments of this specification. As Figure 2 shown, there may be multiple working oil ports M, such as 2, 6, etc., and the shape of the working oil port P may be circular or other shapes; there may also be multiple relief ports N, such as 2, 6, etc., and the shape of the relief port T may be circular or other shapes.

[0056] In the embodiments of this specification, an upper chamber 9 and a lower chamber 10 may be provided between the main valve sleeve 2 and the cover plate 3, where the upper chamber 9 may be located above the lower chamber 10. When pilot oil is injected into the upper chamber 9 or the lower chamber 10, a pressure difference will occur between the upper chamber 9 and the lower chamber 10, thereby causing the main valve core 1 to move up and down within the main valve sleeve 2. Among them, when pilot oil is injected into the upper chamber 9, the main valve core 1 will move downward, thereby opening the working oil port M of the three-way flow cartridge valve, and enabling the main oil inlet 7 to communicate with the working oil port M through the through hole 8; when pilot oil is injected into the lower chamber 10, the main valve core 1 will move upward, opening the unloading port N of the three-way flow cartridge valve, and further enabling the main oil inlet 7 to communicate with the unloading port N through the through hole 8.

[0057] When the main oil inlet 7 communicates with the working oil port M through the through hole 8, the main oil can flow from the main oil inlet 7, the through hole 8, and the working oil port M into the external working machinery; when the main oil inlet 7 communicates with the unloading port N through the through hole 8, the main oil can flow from the main oil inlet 7, the through hole 8, and the unloading port N into the external return oil tank.

[0058] Furthermore, in order to facilitate the outflow of the main oil from the through hole 8, a baffle 11 may be provided inside the main valve core 1, where the baffle 11 may be located above the through hole 8.

[0059] Figure 3 It is a partial side view of a three-way proportional flow cartridge valve provided by the embodiments of this specification. As Figure 3 shown, the three-way flow cartridge valve may also be provided with an air intake passage. The first opening a of the air intake passage may be provided on the cover plate 3, and the second opening of the air intake passage may be provided on the main valve sleeve 2. Specifically, the second opening of the air intake passage is located above the main valve core 1. Providing the air intake passage can facilitate the up and down movement of the main valve core 1 within the main valve sleeve 2.

[0060] In the embodiments of this specification, the electromagnetic proportional directional valve may include a pilot valve body 12, a pilot valve core 13, and a proportional electromagnet 14; among them, the pilot valve core 13 may be located inside the pilot valve body 12, specifically in the axial hole of the pilot valve body 12; the proportional electromagnet 14 may be located above the pilot valve body 12, and the proportional electromagnet 14 is used to push the pilot valve core 13 to move within the pilot valve body 12.

[0061] The electromagnetic proportional directional valve may be provided on one side of the three-way flow cartridge valve. Specifically, the pilot valve body 12 of the electromagnetic proportional directional valve may be provided on one side of the cover plate 3 of the three-way flow cartridge valve.

[0062] In the embodiments of this specification, a first pressure spring 15 and a second pressure spring 16 may further be provided in the pilot valve body 12; the first pressure spring 15 may be provided above the pilot valve core 13, and the second pressure spring 16 may be provided below the pilot valve core 13; the first pressure spring 15 and the second pressure spring 16 are used to maintain the pilot valve core 13 at a first position within the pilot valve body 12. Among them, the push rod of the proportional electromagnet 14 may pass through the first pressure spring 15 and contact the pilot valve core 13.

[0063] The electromagnetic proportional directional valve may further include a plug 17, and the plug 17 may be provided at one end of the second pressure spring 16 away from the pilot valve core 13. The plug 17 can, on the one hand, play a sealing role, and on the other hand, can also adjust the elastic force of the second pressure spring 16.

[0064] Furthermore, an oil inlet chamber P, a first working chamber A, a second working chamber B, and an oil return chamber T (not shown in the figure) may further be provided in the pilot valve body 12 of the electromagnetic proportional directional valve. The movement of the pilot valve core 13 within the pilot valve body 12 can change the working state of the electromagnetic proportional directional valve. For example, when the pilot valve core 13 moves to the first position, the oil inlet chamber P and the second working chamber B can be connected, and the first working chamber A and the oil return chamber T can be connected, so that the pilot oil in the oil inlet chamber P flows into the second working chamber B, and the pilot oil in the first working chamber A flows into the oil return chamber T; when the pilot valve core 13 moves to the second position, the oil inlet chamber P and the first working chamber A can be connected, and the second working chamber B and the oil return chamber T can be connected, so that the pilot oil in the oil inlet chamber P flows into the first working chamber A, and the pilot oil in the second working chamber B flows into the oil return chamber T.

[0065] The electromagnetic proportional directional valve may further include a second displacement sensor 18; the second displacement sensor 18 is provided above the proportional electromagnet 14, and the second displacement sensor 18 is used to detect the displacement amount of the proportional electromagnet 14.

[0066] In the embodiments of this specification, the three-way proportional flow cartridge valve may further include a proportional amplifier 19. The proportional amplifier 19 may be provided on one side of the pilot valve body 12 away from the cover plate 3 of the three-way flow cartridge valve. Furthermore, the proportional amplifier 19 may be respectively connected to the controller 6 of the three-way flow cartridge valve and the second displacement sensor 18 of the electromagnetic proportional directional valve. The proportional amplifier 19 is used to control the displacement amount of the proportional electromagnet 14 at a second moment based on the electrical signal input externally received by the controller 6, the displacement amount of the main valve core 1 detected by the first displacement sensor 5 at a first moment, and the displacement amount of the proportional electromagnet 14 detected by the second displacement sensor 18 at the first moment. Among them, the second moment is the next moment after the first moment.

[0067] Controlling the displacement of the control proportional electromagnet 14 at the second moment can control the position of the pilot valve core 13 within the pilot valve body 12, and further can control the communication volume between the control oil circuit of the electromagnetic proportional reversing valve and the control oil circuit of the three-way flow cartridge valve.

[0068] In the embodiment of this specification, the electromagnetic proportional reversing valve may further include a first opening of the first control oil circuit and a first opening of the second control oil circuit, and the three-way flow cartridge valve may further include a third control oil circuit and a fourth control oil circuit; wherein, the first opening of the first control oil circuit can communicate with the upper chamber 9 of the three-way flow cartridge valve through the third control oil circuit, and the pilot oil injected into the upper chamber 9 via the first control oil circuit can be used to control the main oil inlet 7 of the three-way flow cartridge valve to communicate with the working oil port M of the three-way flow cartridge valve; the first opening of the second control oil circuit can communicate with the lower chamber 10 of the three-way flow cartridge valve through the fourth control oil circuit, and the pilot oil injected into the lower chamber 10 via the second control oil circuit can be used to control the main oil inlet 7 of the three-way flow cartridge valve to communicate with the unloading port N of the three-way flow cartridge valve.

[0069] Wherein, the first control oil circuit may be located above the second control oil circuit, or the first control oil circuit is located below the second control oil circuit, which is not limited herein.

[0070] Furthermore, the three-way flow cartridge valve may further include a pilot oil inlet oil circuit. The inlet port X of the pilot oil inlet oil circuit may be provided on the three-way flow cartridge valve cover plate 3. The outlet port of the pilot oil inlet oil circuit can communicate with the inlet chamber P of the electromagnetic proportional reversing valve through the inlet port of the electromagnetic proportional reversing valve. The electromagnetic proportional reversing valve can be used for:

[0071] When receiving an electrical signal, controlling the inlet chamber P to communicate with the upper chamber 9 through the second opening of the first control oil circuit;

[0072] When not receiving an electrical signal, controlling the inlet chamber P to communicate with the lower chamber 10 through the second opening of the second control oil circuit.

[0073] In the embodiment of this specification, the second opening of the first control oil circuit of the electromagnetic proportional reversing valve can communicate with the first working chamber A of the electromagnetic proportional reversing valve; the second opening of the second control oil circuit of the electromagnetic proportional reversing valve can communicate with the second working chamber B of the electromagnetic proportional reversing valve. Among them, the inlet chamber P communicates with the upper chamber 9 through the second opening of the first control oil circuit, specifically:

[0074] The inlet chamber P communicates with the upper chamber 9 through the first working chamber A and the second opening of the first control oil circuit.

[0075] The inlet chamber P communicates with the lower chamber 10 through the second opening of the second control oil circuit, specifically:

[0076] The oil inlet chamber P communicates with the lower chamber 10 through the second working chamber B and the second opening of the second control oil passage.

[0077] Furthermore, the three-way flow cartridge valve may further include a pilot oil outlet oil passage. The oil return chamber T of the electro-hydraulic proportional directional valve may communicate with the inlet of the pilot oil outlet oil passage through the oil outlet of the electro-hydraulic proportional directional valve. The outlet Y of the pilot oil outlet oil passage may be provided on the cover plate 3 of the three-way flow cartridge valve. The electro-hydraulic proportional directional valve may also be used for:

[0078] When receiving an electrical signal, controlling the lower chamber 10 to communicate with the oil return chamber T through the second opening of the second control oil passage;

[0079] When not receiving an electrical signal, controlling the upper chamber 9 to communicate with the oil return chamber T through the second opening of the first control oil passage.

[0080] In the embodiments of this specification, the second opening of the first control oil passage of the electro-hydraulic proportional directional valve may communicate with the first working chamber A of the electro-hydraulic proportional directional valve; the second opening of the second control oil passage of the electro-hydraulic proportional directional valve may communicate with the second working chamber B of the electro-hydraulic proportional directional valve. Among them, the lower chamber 10 communicates with the oil return chamber T through the second opening of the second control oil passage, specifically:

[0081] The lower chamber 10 communicates with the oil return chamber T through the second opening of the second control oil passage and the second working chamber B.

[0082] The upper chamber 9 communicates with the oil return chamber T through the second opening of the first control oil passage, specifically:

[0083] The upper chamber 9 communicates with the oil return chamber T through the second opening of the first control oil passage and the first working chamber A.

[0084] Furthermore, the pilot oil injected into the upper chamber 9 via the first control oil passage may also be used to control the pilot oil in the lower chamber 10 to flow out from the outlet Y of the pilot oil outlet oil passage through the oil return chamber T.

[0085] The pilot oil injected into the lower chamber 10 via the second control oil passage may also be used to control the pilot oil in the upper chamber 9 to flow out from the outlet Y of the pilot oil outlet oil passage through the oil return chamber T.

[0086] Such as Figure 3As shown, the three-way proportional flow cartridge valve can also be provided with a first exhaust passage and a second exhaust passage. Among them, the first opening b of the first exhaust passage and the first opening c of the second exhaust passage are arranged on the three-way flow cartridge valve, and specifically can be arranged on the cover plate 3 of the three-way flow cartridge valve. The second opening of the first exhaust passage can be communicated with the first opening of the first control oil passage through the upper cavity 9, and the second opening of the second exhaust passage can be communicated with the first opening of the second control oil passage through the lower cavity 10. The exhaust passage can discharge the gas in the three-way proportional flow cartridge valve, control the pressure, and thus ensure the flow control of the three-way proportional flow cartridge valve.

[0087] A specific working parameter of the three-way proportional flow cartridge valve in the embodiments of this specification can be as follows:

[0088] (1) Maximum working pressure: 35 MPa;

[0089] (2) Maximum flow rate: 2000 L / min;

[0090] (3) When △P = 5 bar, the flow rate is 780 L / min; when △P = 10 bar, the flow rate is 1100 L / min.

[0091] In addition, the three-way proportional flow cartridge valve in the embodiments of this specification conforms to the DIN24340 A-type interface standard and the ISO7368 standard, and has good versatility.

[0092] Figure 4 This is the hydraulic control schematic diagram of a three-way proportional flow cartridge valve provided by the embodiments of this specification. Combining Figure 4 with the structural diagram of the three-way proportional flow cartridge valve provided by the embodiments of this specification Figure 1 , the working process of the three-way proportional flow cartridge valve is as follows:

[0093] When no electrical signal Ref is input to the controller 6 of the three-way flow cartridge valve, the main oil inlet 7 of the three-way flow cartridge valve is connected to the unloading port N, and the three-way flow cartridge valve is in the unloading state. At this time, the pilot spool 13 of the electro-hydraulic proportional directional valve is located at the first position under the control of the first pressure spring 15 and the second pressure spring 16.

[0094] When an electrical signal Ref is input to the controller 6 of the three-way flow cartridge valve, the proportional amplifier 19 will amplify the electrical signal and convert it into a force to push the proportional solenoid 14 of the electro-hydraulic proportional directional valve, causing the push rod of the proportional solenoid 14 to push the pilot spool 13, so that the pilot spool 13 moves to the second position. Further, the oil inlet chamber P of the electro-hydraulic proportional directional valve is connected to the first working chamber A. At this time, the pilot oil flowing from the main valve working chamber K into the oil inlet chamber P will flow into the upper chamber 9 of the three-way flow cartridge valve through the first working chamber A, the first control oil circuit and the third control oil circuit. Further, the main spool 1 moves downward to open the working oil port M of the three-way flow cartridge valve, connecting the main oil inlet port 7 to the working oil port M. During this process, the proportional amplifier 19 will control the position of the pilot spool 13 by controlling the displacement of the proportional solenoid 14, and further control the connection amount between the first control oil circuit and the third control oil circuit, and finally control the opening amount of the working oil port.

[0095] When the electrical signal Ref input to the controller 6 is cut off, the proportional solenoid 14 cannot generate a thrust force. The pilot spool 13 returns to the first position under the control of the first pressure spring 15 and the second pressure spring 16. The oil inlet chamber P of the electro-hydraulic proportional directional valve is connected to the second working chamber B. The pilot oil in the oil inlet chamber P will flow into the lower chamber 10 of the three-way flow cartridge valve through the second working chamber B, the second control oil circuit and the fourth control oil circuit. Further, the main spool 1 moves upward to open the unloading port N of the three-way flow cartridge valve, and the main oil in the main valve working chamber K is unloaded through the unloading port N.

[0096] It can be understood that when the pilot oil flows into the lower chamber 10, the pilot oil in the upper chamber 9 will flow out from the oil outlet Y of the pilot oil outlet oil circuit through the third control oil circuit, the first control oil circuit and the oil return chamber T. Similarly, when an electrical signal is input to the controller 6 again, the pilot oil in the lower chamber 10 will flow out from the oil outlet Y of the pilot oil outlet oil circuit through the fourth control oil circuit, the second control oil circuit and the oil return chamber T.

[0097] Figure 5 This is a control flow chart of a three-way proportional flow cartridge valve provided by an embodiment of this specification. As Figure 5 shown, the controller 6 of the three-way flow cartridge valve receives an external electrical signal of 0 - 10V and transmits it to the proportional amplifier 19. The proportional amplifier 19 will convert the electrical signal into a force and act on the proportional solenoid 14. The proportional solenoid 14 controls the position of the pilot spool 13 to further control the flow rate of the main oil flowing through the three-way flow cartridge valve, and then the main oil flowing out of the three-way flow cartridge valve acts on the external working machinery.

[0098] The three-way proportional flow cartridge valve according to the embodiments of the present specification uses an electromagnetic proportional directional valve as the pilot valve, which has a simple structure, convenient operation, small volume, fast response speed, high linearity, small hysteresis, high repeatability accuracy, and strong anti-interference ability, and can achieve large-flow proportional throttling control. At the same time, without consuming pilot oil, the pilot oil can be directly introduced into the main valve, with small pilot oil loss.

[0099] In addition, the embodiments of the present specification adopt a dual displacement sensor, that is, a first displacement sensor is used to detect the displacement of the main spool, and a second displacement sensor is used to detect the displacement of the proportional solenoid. Then, the displacement of the main spool and the displacement of the proportional solenoid are fed back to the proportional amplifier to control the displacement of the proportional solenoid, and finally a closed-loop control of the displacement of the main spool is achieved, so as to achieve the effect of accurately controlling the flow rate.

[0100] The three-way proportional flow cartridge valve according to the embodiments of the present specification uses a three-way flow cartridge valve as the main valve, which can perform rapid unloading, thereby ensuring the safe operation of external working machinery and having a wide range of applications, such as being applicable to injection molding machines, blow molding machines, ceramic hydraulic presses, pavers, die casting machines, and forging and forming machines and other mechanical equipment.

[0101] For ease of description, spatial relative terms, such as "above", "over", "on the upper surface", "above", etc., may be used here to describe the spatial positional relationship between one device or feature and other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figure is inverted, the device described as "above" or "over" other devices or structures will then be positioned "below" or "beneath" other devices or structures. Thus, the exemplary term "above" can include both the orientation of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations of the spatial relative descriptions used here will be made.

[0102] It should be noted that the terms used here are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used here, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0103] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of this application are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of this application described here can be implemented in an order other than those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that comprises a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or devices.

[0104] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A three-way proportional flow cartridge valve, characterized in that: It includes a pilot valve and a main valve; wherein the pilot valve is an electromagnetic proportional reversing valve, and the main valve is a three-way flow cartridge valve; The electromagnetic proportional reversing valve comprises a first opening of a first control oil circuit and a first opening of a second control oil circuit; The three-way flow cartridge valve includes a third control oil circuit and a fourth control oil circuit; The first opening of the first control oil circuit is connected to the upper chamber of the three-way flow cartridge valve through the third control oil circuit; the pilot oil injected into the upper chamber through the first control oil circuit is used to control the main oil inlet of the three-way flow cartridge valve to be connected to the working oil port of the three-way flow cartridge valve; The first opening of the second control oil circuit is connected to the lower chamber of the three-way flow cartridge valve through the fourth control oil circuit; the pilot oil injected into the lower chamber through the second control oil circuit is used to control the main oil inlet of the three-way flow cartridge valve to connect to the unloading port of the three-way flow cartridge valve.

2. The three-way proportional flow cartridge valve according to claim 1, characterized in that: The three-way flow cartridge valve also includes a pilot oil inlet oil circuit; the oil outlet of the pilot oil inlet oil circuit is connected to the oil inlet chamber of the electromagnetic proportional reversing valve through the oil inlet of the electromagnetic proportional reversing valve; The electromagnetic proportional reversing valve is used to control the oil inlet chamber to communicate with the upper chamber through the second opening of the first control oil circuit when receiving an electrical signal; When no electrical signal is received, the oil inlet chamber is controlled to communicate with the lower chamber through the second opening of the second control oil passage.

3. The three-way proportional flow cartridge valve according to claim 2, characterized in that: The second opening of the first control oil circuit is connected to the first working chamber of the electromagnetic proportional reversing valve; the second opening of the second control oil circuit is connected to the second working chamber of the electromagnetic proportional reversing valve; The oil inlet chamber is connected to the upper chamber through the second opening of the first control oil circuit. Specifically, the oil inlet chamber is connected to the upper chamber through the first working chamber and the second opening of the first control oil circuit. The oil inlet chamber is connected to the lower chamber through the second opening of the second control oil circuit. Specifically, the oil inlet chamber is connected to the lower chamber through the second working chamber and the second opening of the second control oil circuit.

4. The three-way proportional flow cartridge valve according to any one of claims 1 to 3, characterized in that: The three-way flow cartridge valve also includes a pilot oil outlet oil circuit; the oil return chamber of the electromagnetic proportional reversing valve is connected to the oil inlet of the pilot oil outlet oil circuit through the oil outlet of the electromagnetic proportional reversing valve; The electromagnetic proportional reversing valve is used to control the lower chamber to communicate with the oil return chamber through the second opening of the second control oil circuit when receiving an electrical signal; When no electrical signal is received, the upper chamber is controlled to communicate with the oil return chamber through the second opening of the first control oil passage.

5. The three-way proportional flow cartridge valve according to claim 4, characterized in that: The second opening of the first control oil circuit is connected to the first working chamber of the electromagnetic proportional reversing valve; the second opening of the second control oil circuit is connected to the second working chamber of the electromagnetic proportional reversing valve; The lower chamber is connected to the oil return chamber through the second opening of the second control oil circuit, specifically: The lower chamber is connected to the oil return chamber through the second opening of the second control oil circuit and the second working chamber; The upper chamber is connected to the oil return chamber through the second opening of the first control oil circuit, specifically: The upper chamber is connected to the oil return chamber through the second opening of the first control oil passage and the first working chamber.

6. The three-way proportional flow cartridge valve according to claim 1, characterized in that: Also included is a first exhaust passage and a second exhaust passage; The first opening of the first exhaust passage and the first opening of the second exhaust passage are disposed on the three-way flow cartridge valve; The second opening of the first exhaust passage is connected to the first opening of the first control oil passage through the upper chamber; The second opening of the second exhaust passage is communicated with the first opening of the second control oil passage through the lower chamber.

7. The three-way proportional flow cartridge valve according to claim 1, characterized in that: The electromagnetic proportional reversing valve also includes a pilot valve body, a pilot valve core and a proportional solenoid; The pilot valve core is located inside the pilot valve body; The proportional solenoid is located above the pilot valve body; the proportional solenoid is used to push the pilot valve core to move in the pilot valve body.

8. The three-way proportional flow cartridge valve according to claim 7, characterized in that: A first pressure spring and a second pressure spring are arranged in the pilot valve body; the first pressure spring is arranged above the pilot valve core, and the second pressure spring is arranged below the pilot valve core; The first pressure spring and the second pressure spring are used to maintain the pilot valve core in a first position within the pilot valve body; The push rod of the proportional solenoid passes through the first pressure spring and contacts the pilot valve core.

9. The three-way proportional flow cartridge valve according to claim 1, characterized in that: The main valve core of the three-way flow cartridge valve is a hollow structure, and the main oil inlet is arranged at the bottom of the main valve core; the working oil port and the unloading port are both arranged in the circumferential direction of the main valve sleeve of the three-way flow cartridge valve; the unloading port is located above the working oil port; A through hole is provided in the circumferential direction of the side wall of the main valve core.

10. The three-way proportional flow cartridge valve according to claim 9, characterized in that: A baffle is provided inside the main valve core, and the baffle is located above the through hole; The baffle is used to control the main oil to flow out from the through hole.

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