A hydraulic compound valve based on sequential pressure reduction and overflow function

Abstract

The invention discloses a hydraulic composite valve based on a sequential pressure reducing and overflowing function, comprising a valve sleeve formed with a valve cavity, a valve core and a pressure spring, wherein a high-pressure oil P port, a secondary pressure B port and a return oil T port are formed on the valve sleeve; a central oil channel is processed from the bottom surface of the valve core; an annular control groove is processed on the peripheral surface of the valve core, a pressure oil port for radially connecting the P port and the central oil channel is arranged in the annular control groove, and a connecting oil hole for communicating the central oil channel and the B port is also processed on the valve core after the valve core moves upward; a throttling area for realizing the pressure reducing function of the valve is formed between the control edge of the annular control groove and the mouth edge of the P port when the valve core moves upward, an upper shoulder with longitudinal sections on both sides and a lower shoulder located below the upper shoulder are formed on the valve core; when the valve core is in an original state, the B port is connected with the T port, and when the valve core moves upward, the longitudinal section cooperates with the inner shoulder of the valve sleeve to form a damping channel that can divert a part of the oil of the B port back to the T port for realizing the valve overflowing function.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic control, in particular to a hydraulic valve with compound functions, specifically to a hydraulic compound valve based on sequential pressure reduction and overflow functions. Background Art

[0002] Hydraulic valves are widely used in hydraulic equipment and hydraulic components. Hydraulic valves are divided into plate type, tube type and cartridge type. Due to the spatial structure of equipment and components, cartridge hydraulic valves are widely used in compact hydraulic components. Especially in hydraulic swing motors, they are widely used because of their small size, easy installation, and great space saving. However, most swing motors currently have an independent cartridge valve for each function, so there are high requirements for the space design of the plug-in body. Often, many densely packed cartridge valves are arranged on the valve body, which brings troubles to use, installation and subsequent maintenance. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a hydraulic compound valve based on sequential pressure reduction and overflow function which has small volume, few parts, compact structure and can realize sequential pressure reduction and overflow in view of the status quo of the above-mentioned prior art.

[0004] The technical solution adopted by the present invention to solve the above technical problems is:

[0005] A hydraulic composite valve based on sequential pressure reducing and overflowing function comprises a valve sleeve formed with a valve cavity and a valve core slidably arranged in the valve sleeve valve cavity, a pressure spring for applying pre-tightening pressure downward to the valve core is installed in the valve cavity, and a high-pressure oil port P, a secondary pressure port B and a return oil port T are formed on the circumferential surface of the valve sleeve from bottom to top; the valve core is processed from the bottom surface along the axis to allow hydraulic oil to enter to push the valve core to overcome the resistance of the pressure spring and move upward; a concave annular control groove is circumferentially processed on the circumferential surface of the valve core at the corresponding P port, and a pressure oil port for radially connecting the P port and the central oil channel is provided in the annular control groove, and The valve core is also processed with a connecting oil hole for communicating the central oil channel and the B port after the valve core moves upward; the control edge of the annular control groove and the mouth edge of the P port form a throttling area for realizing the valve pressure relief function when the valve core moves upward, and the valve core is formed with an upper shoulder with longitudinal sections on both sides and a lower shoulder located below the upper shoulder for blocking the connection between the connecting oil hole and the B port when the valve core is in the original state; when the valve core is in the original state, the B port is connected to the T port, and when the valve core moves upward, the longitudinal section cooperates with the inner shoulder of the valve sleeve to form a damping channel that can divert part of the oil in the B port back to the T port to realize the valve overflow function.

[0006] To optimize the above technical solutions, the specific measures taken also include:

[0007] The bottom of the above-mentioned valve cavity is a closed end, and a pressure-regulating screw plug is spirally installed at the cavity mouth of the valve cavity; the valve core is formed with a spring guide rod section for preventing radial displacement of the pressure spring, and the pressure spring is sleeved on the spring guide rod section of the valve core, the lower end of the pressure spring is connected to the valve core, and the upper end of the pressure spring is connected to the pressure-regulating screw plug.

[0008] The valve sleeve is formed with an external thread for plug-in spiral assembly with the valve hole of the installation component, and the upper part of the valve sleeve is formed with a positioning boss for top contact and positioning cooperation with the installation component.

[0009] A sealing ring is sleeved below the positioning boss of the valve sleeve to prevent oil leakage from the valve hole.

[0010] The diameter of the above-mentioned pressure oil port is smaller than the width of the annular control groove. An annular connecting groove is also formed on the circumferential surface of the valve core. The connecting oil hole is formed in the annular connecting groove, and the diameter of the connecting oil hole is smaller than the width of the annular connecting groove.

[0011] An annular damping groove is machined between the lower shoulder and the upper shoulder to guide the oil of the B port into the damping channel.

[0012] The bottom surface of the valve core is radially processed with a bottom groove that enables the hydraulic oil in the central oil channel to easily enter the bottom surface of the valve core.

[0013] The cross section of the positioning boss is a hexagonal shape that is convenient for screwing with a wrench.

[0014] Compared with the prior art, the hydraulic composite valve of the present invention consists of only four parts: a valve sleeve, a valve core, a pressure spring and a pressure regulating screw plug. An annular control groove is designed on the valve core, and the control edge of the annular control groove can cooperate with the edge of the P port to realize the valve pressure relief function. The upper shoulder of the valve core is machined with longitudinal sections on both sides, and the longitudinal sections can cooperate with the inner shoulder of the valve sleeve to form a damping channel that can divert part of the oil from the B port back to the T port for realizing the valve overflow function.

[0015] The invention adopts plug-in connection, has compact structure, requires fewer parts, and can realize sequential pressure reduction and overflow functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention;

[0017] Figure 2 yes Figure 1 The cross-sectional structure diagram of the middle valve core;

[0018] Figure 3 It is a three-dimensional structural diagram of the valve core;

[0019] Figure 4 It is a schematic diagram of the throttling area of ​​the valve hole of the present invention;

[0020] Figure 5 It is a three-dimensional structural schematic diagram of the present invention;

[0021] Figure 6 It is a schematic diagram of the assembly structure of the present invention and the installation components;

[0022] Figure 7 It is a schematic diagram of the hydraulic principle of the present invention. DETAILED DESCRIPTION

[0023] The embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0024] Figures 1 to 7 It is a schematic diagram of the structure and principle of the present invention.

[0025] The accompanying drawings are marked as follows: acting surface S, sealing ring M, damping channel Z, annular damping groove Z1, throttling area Ax, control edge Lx, mouth edge Lt, valve sleeve 1, valve chamber 1a, inner shoulder 1b, external thread 1c, positioning boss 11, valve core 2, central oil channel 2a, annular control groove 2b, pressure oil port 2c, connecting oil hole 2d, annular connecting groove 2e, bottom groove 2f, spring guide rod section 21, upper shoulder 22, longitudinal section 22a, lower shoulder 23, pressure spring 3, pressure regulating screw plug 4, and mounting component 5.

[0026] As shown in the figure, the present invention discloses a hydraulic composite valve based on sequential pressure relief function. The valve adopts a plug-in structure and can be directly screwed into the valve hole processed by the mounting component 5, so it is easy to install and simple and quick. The mounting component 5 here can be the housing of the hydraulic motor or other housings. The valve is composed of only four parts, including a valve sleeve 1, a valve core 2, a pressure spring 3 and a pressure regulating screw plug 4. The valve sleeve 1 is axially formed with a valve cavity 1a with a closed end at the bottom, and the valve core 2 is slidably arranged in the valve cavity 1a of the valve sleeve 1. The pressure spring 3 is also arranged in the valve cavity 1a, and the pressure spring 3 is used to apply a downward pre-tightening pressure to the valve core 2, so that the valve core 2 is in the original state when the pressure of the hydraulic oil is less than the spring force of the pressure spring 3, that is, the state when the bottom surface of the valve core 2 is connected to the bottom wall of the valve cavity 1a. The pressure regulating screw plug 4 is screwed on the cavity mouth of the valve cavity 1a to adjust the pre-tightening pressure of the pressure spring 3, thereby changing the pressure of the valve core 2 action. The pressure spring 3 is pressed between the pressure regulating screw plug 4 and the valve core 2. In order to prevent the pressure spring 3 from radially deviating and affecting the stability of the valve opening, the valve core 2 is formed with a spring guide rod section 21, which can provide a guide for the pressure spring 3. The pressure spring 3 is sleeved on the spring guide rod section 21 of the valve core 2, the lower end of the pressure spring 3 is in contact with the valve core 2, and the upper end of the pressure spring 3 is in contact with the pressure regulating screw plug 4.

[0027] Depend on Figure 1It can be seen that the valve sleeve 1 of the present invention is formed with a high-pressure oil port P, a secondary pressure oil port B and a return oil port T on its circumference; and the P port, the B port and the T port are arranged at intervals from bottom to top on the valve sleeve 1. The P port is the high-pressure hydraulic oil port of the hydraulic system, the B port is the secondary pressure oil port of the hydraulic system, and the T port is the return oil port of the hydraulic system, which is connected to the oil tank. Figure 2 It can be seen that the valve core 2 is processed with a central oil passage 2a along the axis from the bottom surface, and a concave annular control groove 2b is circumferentially processed on the circumferential surface of the valve core 2 at the corresponding P port. A pressure oil port 2c for radially connecting the P port and the central oil passage 2a is provided in the annular control groove 2b, so that the high-pressure oil of the P port can enter the central oil passage 2a through the annular control groove 2b and the pressure oil port 2c, so that the high-pressure oil acts on the action surface S of the valve core to push the valve core 2 to overcome the resistance of the pressure spring 3 and move upward. The valve core 2 is also processed with a connecting oil hole 2d for connecting the central oil passage 2a and the B port after the valve core 2 moves upward, so that the high-pressure hydraulic oil entering the central oil passage 2a can flow to the secondary pressure B port through the connecting oil hole 2d. The edge of the annular control groove 2b of the present invention can be used as a control edge LX to cooperate with the mouth edge LT of the P port, and a throttling area AX is formed when the valve core 2 moves upward, realizing the valve pressure reducing function. The valve core 2 of the present invention is also formed with an upper shoulder 22 and a lower shoulder 23 of the same diameter. The lower shoulder 23 is located below the upper shoulder 22, and the position of the lower shoulder 23 on the valve core is just when the valve core 2 is in the original state (see Figure 1 When the valve core 2 is in the original state, the connection between the connecting oil hole 2d and the B port can be blocked. When the valve core 2 is in the original state, the B port is connected to the T port. The upper shoulder 22 of the present invention is cut 180 degrees apart to form a longitudinal section 22a. When the valve core moves upward, the longitudinal section 22a cooperates with the inner shoulder 1b of the valve sleeve 1 to form a damping channel Z. The damping channel Z can divert part of the oil in the B port back to the T port to achieve the overflow function of the valve.

[0028] In the embodiment, the valve sleeve 1 of the present invention is formed with an external thread 1c for plug-in screw assembly with the valve hole of the mounting component 5, and the upper part of the valve sleeve 1 is formed with a positioning boss 11 for top contact and positioning with the mounting component 5. The positioning boss 11 is designed to be a regular hexagon, so that the spiral of the present invention can be tightened and fixed on the mounting component 5 by using a wrench.

[0029] like Figure 6 As shown, in order to prevent the valve hole from leaking oil from the thread, the present invention is designed with a sealing ring groove below the positioning boss 11, and a sealing ring M is installed in the sealing ring groove to prevent the valve hole from leaking oil.

[0030] In the embodiment, the diameter of the pressure oil port 2c of the present invention is smaller than the width of the annular control groove 2b, and an annular connecting groove 2e is also formed on the circumferential surface of the valve core 2, and a connecting oil hole 2d is formed in the annular connecting groove 2e, and the diameter of the connecting oil hole 2d is smaller than the width of the annular connecting groove 2e.

[0031] In the embodiment, Figure 3 It can be seen that the present invention also processes an annular damping groove Z1 between the lower shoulder 23 and the upper shoulder 22 to guide the oil of the B port into the damping channel Z.

[0032] In the embodiment, the bottom surface of the valve core 2 of the present invention is radially processed with a bottom groove 2f that allows the hydraulic oil in the central oil channel 2a to easily enter the bottom surface of the valve core 2.

[0033] The working principle of the present invention is as follows: the hydraulic oil enters the central oil passage 2a from the P port. Due to the action of the pressure spring 3, the lower shoulder 23 separates the P port from the secondary pressure B port. At this time, the secondary pressure B port is connected to the oil return port T, and the secondary pressure Br is zero. As the pressure of the hydraulic oil increases, when the pressure of the hydraulic oil on the valve core 2 overcomes the preload pressure of the pressure spring 3, the valve core 2 begins to move upward, causing the lower shoulder 23 to move out of the way, and the hydraulic oil flows to the secondary pressure B port through the connecting oil hole 2d, and the oil flows. The mouth edge LT of the hydraulic oil P port of the valve sleeve 1 and the control edge LX of the valve core 2 form a throttling area AX, so that the valve forms a decompression. The pressure Br after decompression passes through the action surface S of the valve core 2 to make the valve core 2 move upward to balance with the pressure spring 3. In addition, the oil at the B port is diverted through the damping channel Z to the oil tank to form a relief valve function of the secondary pressure Br, so that the secondary pressure will not increase.

[0034] The best embodiment of the present invention has been described, and various changes or modifications made by those skilled in the art will not depart from the scope of the present invention.

Claims

1. A hydraulic composite valve based on sequential pressure reduction and overflow function, comprising a valve sleeve (1) formed with a valve cavity (1a) and a valve core (2) slidably arranged in the valve cavity (1a) of the valve sleeve (1), wherein: A pressure spring (3) for applying a pre-tightening pressure downward to the valve core (2) is installed in the valve cavity (1a); a high-pressure oil port P, a secondary pressure port B and a return oil port T are formed on the circumferential surface of the valve sleeve (1) from bottom to top; the valve core (2) is processed along the axis from the bottom surface to have a central oil passage (2a) that allows hydraulic oil to enter to push the valve core (2) to overcome the resistance of the pressure spring (3) and move upward; a concave annular control groove (2b) is circumferentially processed on the circumferential surface of the valve core (2) at the corresponding P port, and a pressure oil port (2c) for radially connecting the P port and the central oil passage (2a) is provided in the annular control groove (2b); and the valve core (2) is also processed with a pressure oil port (2c) for connecting the central oil passage (2a) and the B port after the valve core (2) moves upward. The control edge (LX) of the annular control groove (2b) and the mouth edge (LT) of the P port form a throttling area (AX) for realizing the valve pressure reducing function when the valve core (2) moves upward; the valve core (2) is formed with an upper shoulder (22) with longitudinal sections (22a) on both sides and a lower shoulder (23) located below the upper shoulder (22) for blocking the connection between the connecting oil hole (2d) and the B port when the valve core (2) is in the original state; when the valve core is in the original state, the B port is connected to the T port; when the valve core moves upward, the longitudinal section (22a) cooperates with the inner shoulder (1b) of the valve sleeve (1) to form a damping channel (Z) capable of diverting a part of the oil in the B port back to the T port for realizing the valve overflow function.

2. A hydraulic compound valve based on sequential pressure reduction and overflow function according to claim 1, characterized in that: The bottom of the valve cavity (1a) is a closed end, and a pressure regulating screw plug (4) is spirally installed at the cavity opening of the valve cavity (1a); the valve core (2) is formed with a spring guide rod section (21) for preventing the radial deviation of the pressure spring (3), and the pressure spring (3) is sleeved on the spring guide rod section (21) of the valve core (2), the lower end of the pressure spring (3) is in contact with the valve core (2), and the upper end of the pressure spring (3) is in contact with the pressure regulating screw plug (4).

3. A hydraulic compound valve based on sequential pressure reduction and overflow function according to claim 2, characterized in that: The valve sleeve (1) is formed with an external thread (1c) for inserting and spirally assembling with the valve hole of the mounting component (5), and the upper part of the valve sleeve (1) is formed with a positioning boss (11) for top contact and positioning cooperation with the mounting component (5).

4. A hydraulic compound valve based on sequential pressure reduction and overflow function according to claim 3, characterized in that: A sealing ring (M) is sleeved below the positioning boss (11) of the valve sleeve (1) for preventing oil leakage from the valve hole.

5. A hydraulic compound valve based on sequential pressure reduction and overflow function according to claim 4, characterized in that: The diameter of the pressure oil port (2c) is smaller than the width of the annular control groove (2b); an annular connecting groove (2e) is also formed on the circumferential surface of the valve core (2); the connecting oil hole (2d) is formed in the annular connecting groove (2e); and the diameter of the connecting oil hole (2d) is smaller than the width of the annular connecting groove (2e).

6. A hydraulic compound valve based on sequential pressure reduction and overflow function according to claim 5, characterized in that: An annular damping groove (Z1) is machined between the lower shoulder (23) and the upper shoulder (22) to guide the oil from the B port into the damping channel (Z).

7. A hydraulic compound valve based on sequential pressure reduction and relief function according to claim 6, characterized in that: The bottom surface of the valve core (2) is radially processed to have a bottom groove (2f) that enables the hydraulic oil in the central oil channel (2a) to easily enter the bottom surface of the valve core (2).

8. The hydraulic compound valve based on sequential pressure reduction and relief function according to claim 7 is characterized in that: The cross section of the positioning boss (11) is a hexagonal shape which is convenient for screwing with a wrench.

Images