Spring-free hydraulic control one-way valve

Abstract

The spring-free hydraulic control one-way valve comprises a valve body, the valve body is provided with a valve cavity and a control cavity, a valve element is matched with the interior of the valve body in an up-down moving mode, a piston is matched with the interior of the control cavity in an up-down moving mode, a rod piece of the valve element penetrates through the valve body to be fixedly connected with the piston, and the valve body is provided with an oil inlet and an oil outlet right opposite to the valve cavity. A control oil port and an oil drainage port are formed in the valve body opposite to the control cavity; a valve element upper limiting device and a valve element lower limiting device are fixed in a valve cavity of the valve body, an upper through hole is formed in the valve element upper limiting device, a lower through hole and an oil passing opening communicated with the lower through hole are formed in the valve element lower limiting device, the lower through hole is communicated with the oil outlet, and a conical surface and a plane are arranged on the two sides of the valve element respectively. Valve element openings are formed in the two ends of the valve element. According to the spring-free hydraulic control one-way valve, the valve element is pushed to move through fluid power to achieve forward circulation and reverse non-circulation of the hydraulic control one-way valve, the stability of a hydraulic system and other hydraulic elements are guaranteed, and the service life of the hydraulic elements is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic pipeline systems, and in particular to a springless hydraulically controlled one-way valve. Background Art

[0002] In recent years, hydraulic transmission and control technology is an important basic technology for the development and progress of modern industrial equipment technology. Due to its high power ratio, fast response speed, easy standardization and automation, it has been widely used in agricultural production, aerospace and national defense construction, and has played an indelible role in the development of national economy and social productivity. According to the survey, 94% of foreign engineering machinery, 91% of CNC machining centers, and 95% of automated production lines basically use hydraulic technology.

[0003] The normal and efficient operation of the hydraulic system is inseparable from the cooperation of various hydraulic components. The hydraulically controlled one-way valve is one of the directional control valves of the hydraulic system. Under normal circumstances, it only allows the hydraulic oil to flow in the forward direction. When reverse flow is required, the reverse flow can be achieved by feeding the pressure oil through the hydraulic control port. At present, the valve core of the hydraulically controlled one-way valve is mainly a structure of a combination of a cone valve and a spring. The pressure oil achieves forward flow by overcoming the spring force. However, after long-term use, the hydraulically controlled one-way valve using a spring has the hidden danger of spring failure, especially in high-pressure and large-flow hydraulic systems, which affects the stability of the hydraulic system and even damages other hydraulic components. Summary of the invention

[0004] In view of the deficiencies of the above-mentioned prior art, the technical problem to be solved by this patent application is how to provide a springless hydraulically controlled one-way valve, which does not use a spring, but uses the hydraulic force generated by the flowing fluid to push the valve core to control the forward flow of the oil, and can also achieve reverse flow of the oil by feeding control oil. The problem of the existing hydraulically controlled one-way valve using a spring valve core failing after long-term use, affecting the stability of the hydraulic system, and even damaging other hydraulic components, is solved. By optimizing the valve core structure and utilizing the hydraulic force generated by the flow of oil, the valve core is pushed to move, so that the hydraulic oil flows forward. When the system requires the hydraulically controlled one-way valve to flow in the reverse direction, hydraulic oil can be fed through the hydraulic control port to overcome the forward hydraulic pressure and achieve reverse flow of the hydraulically controlled one-way valve.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A springless hydraulic one-way valve comprises a valve body, the valve body is provided with a valve cavity and a control cavity, a valve core is provided in the valve body for upward and downward movement, a piston is provided in the control cavity for upward and downward movement, a rod of the valve core passes through the valve body and is fixedly connected with the piston, an oil inlet and an oil outlet are provided in the valve body facing the valve cavity, and a control oil port and an oil drain port are provided in the valve body facing the control cavity; the characteristics are as follows:

[0007] An upper valve core position limit device and a lower valve core position limit device are fixed in the valve cavity of the valve body, the upper valve core position limit device is provided with an upper through hole, the lower valve core position limit device is provided with a lower through hole and an oil through port connected with the lower through hole, the lower through hole is connected with the oil outlet, a conical surface and a plane surface are respectively provided on both sides of the valve core, and valve core openings are provided at both ends of the valve core.

[0008] Wherein, the oil inlet is connected to an interface of the hydraulic oil circuit system that requires forward flow, and the oil inlet is an oil circuit interface of the hydraulically controlled one-way valve system.

[0009] Wherein, the oil outlet is connected to an interface of a hydraulic oil circuit system that requires reverse flow, and the oil outlet is an oil circuit interface of a hydraulically controlled one-way valve system.

[0010] Wherein, the control oil port is connected to the hydraulic oil circuit system hydraulic control one-way valve control oil circuit, and the control oil port is the hydraulic control one-way valve external control oil circuit interface.

[0011] Wherein, the oil drain port is a hydraulically controlled oil drain port of a hydraulically controlled one-way valve, which is connected to the oil tank.

[0012] In summary, the springless hydraulically controlled one-way valve utilizes the fluid hydraulic force to push the valve core to move to achieve forward flow and reverse non-flow of the hydraulically controlled one-way valve, effectively avoiding the risk of spring failure of the hydraulically controlled one-way valve using a spring after long-term use, especially in medium-high pressure and medium-high flow rate hydraulic systems, ensuring the stability of the hydraulic system and other hydraulic components, and increasing the service life of the hydraulic components. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The figure is a schematic structural diagram of a springless hydraulically controlled one-way valve according to the present invention.

[0014] Figure 2 Schematic diagram of the connection between the valve core and the piston. DETAILED DESCRIPTION

[0015] The present invention is further described in detail below in conjunction with the accompanying drawings. In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "upper, lower" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the devices or components referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0016] like Figure 1-2As shown, a springless hydraulically controlled one-way valve comprises a valve body, the valve body is provided with a valve cavity and a control cavity, a valve core 3 is provided in the valve body for upward and downward movement, a piston 4 is provided in the control cavity for upward and downward movement, a rod of the valve core 4 passes through the valve body and is fixedly connected with the piston 5, an oil inlet 1 and an oil outlet 2 are provided in the valve body facing the valve cavity, and a control oil port 5 and an oil drain port 8 are provided in the valve body facing the control cavity;

[0017] An upper valve core position limit device 6 and a lower valve core position limit device 7 are fixed in the valve cavity of the valve body, the upper valve core position limit device 6 is provided with an upper through hole, the lower valve core position limit device 7 is provided with a lower through hole and an oil through port 9 connected to the lower through hole, the lower through hole is connected to the oil outlet 2, a conical surface and a plane surface are respectively provided on both sides of the valve core, and valve core openings are provided at both ends of the valve core.

[0018] The valve core 3 has two working surfaces: a conical surface and a flat surface. Figure 2 As shown, a is a plane, b and c are conical surfaces, which are the upper conical surface and the lower conical surface respectively, and d is the valve core opening. The valve core can move up and down in the valve cavity. When the oil flows forward (pressure oil flows in from the oil inlet 1), the upper through hole of the valve core upper limit device 6 acts on the upper conical surface and the flat surface of the valve core successively, so that the valve core moves downward, and the lower conical surface of the valve core contacts the lower limit device 7 of the valve core, so that the oil cannot pass through the lower through hole of the lower limit device 7 of the valve core, but can pass through the valve core opening and connect with the oil outlet 2 through the oil through hole 9 to achieve forward flow. When the oil flows in reverse (pressure oil flows in from the oil outlet 2), the lower through hole of the lower limit device 7 of the valve core and the oil through hole 9 act on the lower conical surface and the flat surface of the valve core 3 successively, so that the valve core 3 moves upward, and the upper conical surface of the valve core contacts the upper limit device 6 of the valve core, so that the oil cannot pass through the upper through hole of the upper limit device 6 of the valve core, so that the oil cannot flow in reverse. However, pressure oil can be fed into the control oil port 5. The pressure oil acts on the piston 4 to overcome the force of the pressure oil entering from the oil outlet 2 on the valve core 3, causing the valve core 3 to move downward. The conical surface on the valve core is separated from the valve core upper limit device 6, so that the hydraulic oil can be connected to the oil inlet 1 through the through hole on the valve core upper limit device 6, thereby realizing reverse flow of oil.

[0019] The valve core upper limit device 6 is provided with an upper through hole to achieve the function of passing oil and limiting the upward movement distance of the valve core 3.

[0020] The valve core lower limit device 7 is provided with a lower through hole, and has oil through holes 9 on the surrounding sides, so as to realize the function of passing oil and limiting the downward movement distance of the valve core 3.

[0021] During implementation, the oil inlet 1 is connected to an interface of a hydraulic oil circuit system that requires forward flow, and the oil inlet is an oil circuit interface of a hydraulically controlled one-way valve system.

[0022] During implementation, the oil outlet 2 is connected to an interface of the hydraulic oil circuit system that requires reverse flow, and the oil outlet is an oil circuit interface of a hydraulically controlled one-way valve system.

[0023] During implementation, the control oil port 5 is connected to the hydraulic oil system hydraulic control one-way valve control oil circuit, and the control oil port is the hydraulic control one-way valve external control oil circuit interface.

[0024] During implementation, the oil drain port 8 is a hydraulically controlled oil drain port of a hydraulically controlled one-way valve, which is connected to the oil tank.

[0025] The piston 4 is the working surface for controlling the pressure of the oil chamber and moves synchronously with the valve core 3.

[0026] Finally, it should be noted that those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A springless hydraulic one-way valve, comprising a valve body, the valve body is provided with a valve cavity and a control cavity, a valve core is provided in the valve body for upward and downward movement, a piston is provided in the control cavity for upward and downward movement, a rod of the valve core passes through the valve body and is fixedly connected with the piston, an oil inlet and an oil outlet are provided in the valve body facing the valve cavity, and a control oil port and an oil drain port are provided in the valve body facing the control cavity; characterized in that: An upper valve core position limit device and a lower valve core position limit device are fixed in the valve cavity of the valve body, the upper valve core position limit device is provided with an upper through hole, the lower valve core position limit device is provided with a lower through hole and an oil through port connected with the lower through hole, the lower through hole is connected with the oil outlet, a conical surface and a plane surface are respectively provided on both sides of the valve core, and valve core openings are provided at both ends of the valve core.

2. A springless hydraulically controlled one-way valve according to claim 1, characterized in that: The oil inlet is connected to an interface of a hydraulic oil circuit system that requires forward flow, and the oil inlet is an oil circuit interface of a hydraulically controlled one-way valve system.

3. A springless hydraulically controlled one-way valve according to claim 1, characterized in that: The oil outlet is connected to an interface of a hydraulic oil circuit system that requires reverse flow, and the oil outlet is an oil circuit interface of a hydraulically controlled one-way valve system.

4. A springless hydraulically controlled one-way valve according to claim 1, characterized in that: The control oil port is connected to the hydraulic oil system hydraulic control one-way valve control oil circuit, and the control oil port is the hydraulic control one-way valve external control oil circuit interface.

5. The springless hydraulically controlled one-way valve according to claim 1, characterized in that: The oil drain port is a hydraulically controlled oil drain port of a hydraulically controlled one-way valve and is connected to the oil tank.

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