Multi-way valve LS pressure release valve

Abstract

The utility model relates to the technical field of hydraulic control, in particular to a multi-way valve LS pressure release valve which comprises a main valve, a coil, an electromagnet and a manual push rod. The main valve is provided with a valve sleeve, a valve element is arranged in the valve sleeve, a small damping hole and a large damping hole are formed in the valve element, and a steel ball and a plug are installed on one side of the valve element. A magnetic core pipe is installed at one end of the valve element, an electromagnetic push rod is coaxially installed on the magnetic core pipe, and the electromagnetic push rod is fixedly connected with the valve element in an inserted mode. The manual push rod mechanism is designed, a push rod can be manually pushed and pulled, the electromagnetic pressure relief valve is subjected to unauthorized reversing, seat valve type oil sealing is adopted, a high-frequency response control valve is achieved, the manual unauthorized function is achieved, the LS pressure relief state of the multi-way valve is controlled, the structure is simple, response is fast, work is reliable, and use is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic control, in particular to a multi-way valve LS pressure relief valve. Background Art

[0002] Load-sensitive multi-way valves with LS systems are widely used in engineering machinery hydraulic systems. The working pressure of the multi-way valve reaches more than 40Mpa. With the continuous improvement of the requirements of engineering machinery hydraulic systems for high pressure, response speed, and control accuracy, the traditional structure of the electromagnetic pressure relief valve has a high failure rate under high-pressure and high-frequency pressure shocks, a long LS pressure building time, and a slow system response speed. Utility Model Content

[0003] The utility model aims to provide a multi-way valve LS pressure relief valve to solve the problems in the above background technology that the electromagnetic pressure relief valve has a high failure rate under high-pressure and high-frequency pressure shocks, the LS pressure building time is long, and the system response speed is slow.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] Multi-way valve LS pressure relief valve, including main valve, coil, electromagnet, manual push rod;

[0006] The main valve is provided with a valve sleeve, a valve core is arranged in the valve sleeve, a small damping hole and a large damping hole are opened on the valve core, a steel ball and a screw plug are installed on one side of the valve core, and a cavity is also installed in the main valve;

[0007] A magnetic core tube is installed at one end of the valve core, an electromagnetic push rod is coaxially installed on the magnetic core tube, and the electromagnetic push rod is plugged and fixed to the valve core.

[0008] Preferably, a first sealing ring is installed at one end of the valve sleeve close to the magnetic core tube.

[0009] Preferably, a second sealing ring is installed at one end of the valve sleeve close to the screw plug.

[0010] Preferably, the middle portion of the valve sleeve is designed with uniformly distributed first valve holes, and the first valve holes are connected to the LS port.

[0011] Preferably, a second valve hole is provided at the end of the valve sleeve, and the second valve hole is connected to the T-port.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. This multi-way valve LS pressure relief valve is installed on the multi-way valve oil inlet body through the valve sleeve to control the LS circuit pressure relief function. The middle part of the valve sleeve is designed with evenly distributed valve holes connected to the LS port, and the valve hole on the right is connected to the T port; there is a valve core inside the valve sleeve, and the valve core is provided with a small damping hole and a large damping hole. When the solenoid valve is powered off, the LS port communicates with the T port to achieve LS pressure relief; when the solenoid valve is powered on, the LS port is disconnected from the T port to achieve LS pressure. When the multi-way valve working joint is in the middle standby position, if the LS pressure is too low, the T port pressure can overcome the electromagnetic thrust to open the valve core, and the T port replenishes oil to the LS port to achieve the purpose of rapid response. There are steel balls and screw plugs on the right side of the valve core, and the electromagnetic pressure relief valve can be overridden by manually pushing and pulling the push rod. There is a valve core inside the valve sleeve, and a small damping hole and a large damping hole are arranged on the valve core. When the solenoid valve is powered off, the LS port is connected with the T port to realize LS pressure relief; when the solenoid valve is powered on, the LS port is disconnected from the T port to realize LS pressure increase. When the multi-way valve working joint is in the middle standby position, if the LS pressure is too low, the T port pressure can overcome the electromagnetic thrust to open the valve core, and the T port replenishes oil to the LS port to achieve the purpose of rapid response.

[0014] 2. This multi-way valve LS pressure relief valve adopts a seat valve type oil sealing to achieve a high-frequency response control valve with a manual override function to control the pressure relief state of the multi-way valve LS. It has a simple structure, fast response, reliable operation and easy use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, further detailed explanation is provided, but the accompanying drawings do not constitute a limitation to the present invention.

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a cross-sectional view of the internal structure of the LS pressure relief valve of the utility model;

[0018] Figure 3 This is the hydraulic principle diagram of the utility model;

[0019] Figure 4 This is a schematic diagram of the use of the multi-way valve system of the utility model.

[0020] The meaning of the symbols in the figure:

[0021] 1-main valve, 2-coil, 3-electromagnet, 4-manual push rod, 5-magnetic core tube, 6-electromagnetic push rod, 7-first sealing ring, 8-valve sleeve, 9-valve core, 10-steel ball, 11-screw plug, 12-second sealing ring; 13-first valve hole; 14-small damping hole; 15-cavity; 16-large damping hole; 17-second valve hole. DETAILED DESCRIPTION

[0022] The following will combine the embodiments of the utility model and the drawings of the specification to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] In the description of the present invention, it should be understood that the terms "center", "vertical", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0024] Multi-way valve LS pressure relief valve, such as Figure 1-Figure 4As shown, it includes a main valve 1, a coil 2, an electromagnet 3, and a manual push rod 4. The main valve 1 is provided with a valve sleeve 8, a valve core 9 is provided inside the valve sleeve 8, a small damping hole 14 and a large damping hole 16 are provided on the valve core 9, and a steel ball 10 and a screw plug 11 are installed on one side of the valve core 9; a magnetic core tube 5 is installed at one end of the valve core 9, and an electromagnetic push rod 6 is coaxially installed on the magnetic core tube 5. The electromagnetic push rod 6 is plugged and fixed with the valve core 9. The LS pressure relief valve is installed on the oil inlet body of the multi-way valve through the valve sleeve 8 to control the pressure relief function of the LS circuit. The middle part of the valve sleeve 8 is designed with uniformly distributed valve holes connected to the LS port, and the right valve hole is connected to the T port; there is a valve core 9 inside the valve sleeve 8, and a small damping hole 14 and a large damping hole 16 are provided on the valve core 9. When the electromagnetic valve is powered off, the LS port communicates with the T port to achieve LS pressure relief; when the electromagnetic valve is powered on, the LS port is disconnected from the T port to achieve LS pressure. When the multi-way valve working joint is in the middle standby position, if the LS pressure is too low, the T port pressure can overcome the electromagnetic thrust to open the valve core 9, and the T port replenishes oil to the LS port to achieve the purpose of rapid response. There are steel balls 10 and screw plugs 11 on the right side of the valve core 9, and the electromagnetic pressure relief valve can be overridden by manually pushing and pulling the push rod. There is a valve core 9 inside the valve sleeve 8, and a small damping hole 14 and a large damping hole 16 are provided on the valve core 9. When the electromagnetic valve is powered off, the LS port communicates with the T port to achieve LS pressure relief; when the electromagnetic valve is powered on, the LS port is disconnected from the T port to achieve LS pressure. When the multi-way valve working joint is in the middle standby position, if the LS pressure is too low, the T port pressure can overcome the electromagnetic thrust to open the valve core 9, and the T port replenishes oil to the LS port to achieve the purpose of rapid response. The seat valve type oil sealing is adopted to achieve a high-frequency response control valve with a manual overriding function to control the LS pressure relief state of the multi-way valve. It has a simple structure, fast response, reliable operation and convenient use.

[0025] It is worth noting that the close combination of the coil 2 and the electromagnet 3 enables the electromagnet 3 to quickly generate magnetic force when the coil is energized, pushing the electromagnetic push rod 6 to move. This design not only has a fast response speed, but also has accurate and reliable movements, ensuring that the valve can be quickly opened or closed when needed, and the manual push rod 4 provides the operator with the possibility of manually controlling the valve. In the event of electromagnet failure or other special circumstances, the operator can directly push the valve core 9 to move through the manual push rod 4, ensuring that the valve can work reliably under any circumstances.

[0026] Furthermore, a first sealing ring 7 is installed at one end of the valve sleeve 8 close to the magnetic core tube 5, which effectively enhances the sealing performance of this part.

[0027] Specifically, a second sealing ring 12 is installed at one end of the valve sleeve 8 close to the screw plug 11 to enhance the sealing performance.

[0028] The valve sleeve 8 is provided with uniformly distributed first valve holes 13 in the middle thereof, and the first valve holes 13 are connected to the LS port.

[0029] In addition, a second valve hole 17 is provided at the end of the valve sleeve 8 , and the second valve hole 17 is communicated with the T port.

[0030] The working principle of the multi-way valve LS pressure relief valve: The multi-way valve LS pressure relief valve is installed in the LS circuit on the multi-way valve oil inlet body. The hydraulic principle is as follows: Figure 4 As shown. The structure of the multi-way valve LS pressure relief valve is as follows Figure 2 As shown, the LS pressure relief valve is installed on the oil inlet body of the multi-way valve through the valve sleeve 8. The middle part of the valve sleeve 8 is designed with evenly distributed valve holes connected to the LS port, and the valve hole on the right is connected to the T port. There is a valve core 9 inside the valve sleeve 8, and a small damping hole 14 and a large damping hole 16 are provided on the valve core 9. When the solenoid valve is powered off, the electromagnetic push rod 6 is on the left side. Due to the action of the two damping holes on the valve core 9, the pressure in the cavity 15 is lower than the pressure of the LS port. The surface pressure of the LS pressure acting on the annular area difference of the valve core 9 causes the valve core 9 to move left, thereby communicating the LS port with the T port to achieve LS pressure relief; when the solenoid valve is powered on, the electromagnetic push rod 6 is pushed to the right by the electromagnetic thrust to seal the large damping hole 16. At this time, the pressure in the cavity 15 is high pressure, and the valve core is pressed on the step of the valve sleeve 8, thereby disconnecting the LS port from the T port to achieve LS pressure. When the multi-way valve working joint is in the middle standby state, LS is in the low-pressure standby state, and the solenoid valve is in the energized state. At this time, the valve core 9 is pressed on the step in the valve sleeve 8. If the LS pressure is too low due to leakage, the pressure at the T port can overcome the electromagnetic thrust to open the valve core 9, and the T port replenishes oil to the LS port to ensure that the LS cavity is full of oil, and when the multi-way valve needs to be switched, the LS cavity quickly builds pressure to achieve the purpose of rapid response. There are steel balls 10 and screw plugs 11 on the right side of the valve core 9. The oil holes on the screw plugs 11 are small, which can achieve a certain filtering effect. The electromagnetic pressure relief valve can be reversed by manually pushing and pulling the push rod.

[0031] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. Multi-way valve LS pressure relief valve, characterized by: It comprises a main valve (1), a coil (2), an electromagnet (3), and a manual push rod (4); The main valve (1) is provided with a valve sleeve (8), a valve core (9) is arranged in the valve sleeve (8), a small damping hole (14) and a large damping hole (16) are opened on the valve core (9), a steel ball (10) and a screw plug (11) are installed on one side of the valve core (9), and a cavity (15) is also installed in the main valve (1); A magnetic core tube (5) is installed at one end of the valve core (9), an electromagnetic push rod (6) is coaxially installed on the magnetic core tube (5), and the electromagnetic push rod (6) is plugged and fixed to the valve core (9).

2. The multi-way valve LS pressure relief valve according to claim 1, characterized in that: A first sealing ring (7) is installed at one end of the valve sleeve (8) close to the magnetic core tube (5).

3. The multi-way valve LS pressure relief valve according to claim 1, characterized in that: A second sealing ring (12) is installed at one end of the valve sleeve (8) close to the screw plug (11).

4. The multi-way valve LS pressure relief valve according to claim 1, characterized in that: The middle part of the valve sleeve (8) is designed with uniformly distributed first valve holes (13), and the first valve holes (13) are connected to the LS port.

5. The multi-way valve LS pressure relief valve according to claim 1, characterized in that: A second valve hole (17) is provided at the end of the valve sleeve (8), and the second valve hole (17) is connected to the T port.

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