Shuttle valve with back pressure elimination function

Abstract

The application discloses a shuttle valve with back pressure elimination function, which comprises a valve body, an upper valve cover and a lower valve cover; the upper valve cover comprises left valve blocks, middle valve blocks and right valve blocks which are connected in sequence; the bottom of the middle valve block is provided with a valve rod which is inserted into the valve body; the lower valve cover is arranged at the bottom of the valve body to seal the bottom of the valve body. The application can effectively improve the utilization efficiency of the hydraulic control oil circuit in the automatic control system. The linkage between the first oil inlet, the second oil inlet and the detection oil circuit can achieve the technical effect of different oil pressures. When the first oil inlet and the second oil inlet stop supplying oil, the oil pressure in the detection oil circuit can be quickly discharged through the pressure relief port, so as to eliminate the back pressure in the detection oil circuit, balance the pressure during the next oil supply, and prevent the situation that the external air pressure cannot push away the steel ball when the first oil inlet and / or the second oil inlet supply oil.

Description

Technical Field

[0001] This invention relates to the field of automotive automated hydraulic control, and more specifically, to a shuttle valve with back pressure relief function. Background Technology

[0002] In industrial automation, common control methods include mechanical structure / stroke control, electrical control, hydraulic control, and pneumatic control. In standard equipment, such as machining centers, automation is most often achieved by combining electrical, hydraulic, and pneumatic control. The automation interfaces available to end users for secondary development are generally only one or a few sets of hydraulic control interfaces.

[0003] Generally, shuttle valves use two oil lines connected to a single outlet to improve oil line utilization efficiency. In the industrial era of Industry 5.0, extremely high automation requirements are placed on various equipment and facilities, which in turn places stringent control demands on their control systems. For hydraulic systems, the sequential operation requirements of complex mechanical actions necessitate the use of more "inlet" and "return" oil lines, and also require the hydraulic control system to be equipped with more hydraulic "detection / control" oil lines to ensure sequential operation control and operational safety.

[0004] Such as hydraulic principles Figure 8 As shown, L1 is the hydraulic circuit for executing the action of component 1, L2 is the hydraulic circuit for executing the action of component 2, L3 is the hydraulic circuit for restoring the actions of components 1 and 2, and K is the detection / control hydraulic circuit. If it is necessary to monitor the oil pressure of the L1 and L2 circuits according to the action execution sequence, then L1 and L2 need to be connected to the hydraulic circuit K simultaneously. Only the shuttle valve can satisfy the requirement of two hydraulic circuits being connected to one circuit at the same time and being able to switch and monitor according to a certain time sequence. At the same time, the hydraulic circuit K is a "detection / control" hydraulic circuit, which usually only monitors the oil pressure but not the oil flow. In complex hydraulic control systems, it is often necessary to monitor the oil pressure of a specific section of the hydraulic circuit at a specific time sequence to confirm the action execution and ensure the safety of the system.

[0005] A common shuttle valve has a shuttle-shaped valve core that moves left and right within the valve to switch the oil inlet path. However, the left and right oil paths cannot be filled with oil at the same time; that is, only one oil path can be kept connected to the outlet. Because of this, in practical applications, it can only detect the inlet and outlet of the same oil path at the same time. In actual applications, there are very few cases where it is necessary to monitor both directions of the inlet and outlet of the same oil path.

[0006] Therefore, how to provide a pressure regulating valve that can be used to monitor the oil pressure sequence in different oil circuits and avoid back pressure at the monitoring port has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0007] The purpose of this invention is to provide a shuttle valve with back pressure relief function to solve the problems in the background art.

[0008] According to one aspect of the present invention, a shuttle valve with back pressure relief function is provided, comprising a valve body, an upper valve cover, and a lower valve cover;

[0009] The upper valve cover includes a left valve block, a middle valve block, and a right valve block connected in sequence; the bottom of the middle valve block is provided with a valve stem, which is inserted into the valve body; the lower valve cover is provided at the bottom of the valve body to close the bottom of the valve body.

[0010] The valve body has a valve sleeve on its inner side wall. A first valve core and a second valve core are slidably connected between the valve sleeve and the valve stem. The first valve core is located at the upper end of the second valve core, and an oil chamber partition block is provided between the outer side wall of the first valve core and the valve sleeve. The first valve core can push the second valve core to move along the gap between the oil chamber partition block and the valve stem.

[0011] The outer wall of the valve body is also provided with a first oil inlet and a second oil inlet. The first oil inlet is connected to the top of the first valve core, and the second oil inlet is connected to the top of the second valve core. The connection between the second oil inlet and the valve core is located below the oil chamber partition block.

[0012] The first oil inlet is also connected to the left valve block via an oil groove, and the second oil inlet is connected to the right valve block via an oil groove; the middle valve block and the valve stem are provided with a detection oil circuit that communicates with the left valve block and the right valve block, and the left and right sides of the detection oil circuit are sealed by steel balls, and springs are connected between the steel balls. The oil pressure of the first oil inlet and the first oil inlet can respectively push open the steel balls at the left valve block and the right valve block;

[0013] The bottom of the valve body is also provided with an oil drain hole, and the outer side of the valve body is provided with a pressure relief port that penetrates the second valve core. When the second valve core abuts against the oil chamber partition block, the oil drain hole is connected to the pressure relief port.

[0014] Optionally, in the shuttle valve with back pressure relief function according to the present invention, an oil storage chamber is further provided between the second valve core and the lower valve cover, and a through hole is provided between the bottom of the valve stem and the oil storage chamber. When the second valve core slides downward, the pressure relief port is disconnected from the oil drain hole, and the oil in the detection oil circuit is temporarily stored in the oil storage chamber.

[0015] Optionally, in a shuttle valve with back pressure relief function according to the present invention, the ends of the left valve block and the right valve block are respectively provided with a left end cover and a right end cover. An annular pad is provided between the left end cover and the left valve block, and between the right end cover and the right valve block. The pad abuts against the steel ball, and the side of the pad facing the steel ball has a groove structure, so that the steel ball can close the channel in the center of the pad under the action of the spring.

[0016] Optionally, in a shuttle valve with back pressure relief function according to the present invention, a sealing ring is provided between the pad block, the left valve block, and the right valve block.

[0017] Optionally, in the shuttle valve with back pressure relief function according to the present invention, the left valve block, the middle valve block and the right valve block are fastened together by a laterally arranged pin sleeve and valve block screws.

[0018] Optionally, in the shuttle valve with back pressure relief function according to the present invention, the lower valve cover and the valve body are fastened together by a valve seat and connecting screws.

[0019] Optionally, according to the shuttle valve with back pressure relief function of the present invention, the valve body is further provided with an exhaust port, and an air chamber is provided between the oil chamber partition block and the first valve core. The exhaust port is connected to the air chamber so that when the first valve core slides down or up, the exhaust port can balance the air pressure in the air chamber.

[0020] Optionally, in a shuttle valve with back pressure relief function according to the present invention, a hollow screw is provided on the exhaust port, and a dust filter element is provided inside the hollow screw to prevent the exhaust port from being blocked.

[0021] Optionally, according to the shuttle valve with back pressure relief function of the present invention, the valve body is further provided with a cleaning port connected to the first oil inlet and the second oil inlet, and the cleaning port is sealed by an oil plug.

[0022] Optionally, in the shuttle valve with back pressure relief function according to the present invention, the oil chamber partition block and the valve sleeve are fastened together by locking screws to prevent the oil chamber partition block from being misaligned.

[0023] This invention discloses a shuttle valve with back pressure elimination function, which improves the utilization efficiency of hydraulic control circuits in automated control systems. Through the linkage between the first oil inlet, the second oil inlet, and the detection oil circuit, different oil pressure effects can be achieved. When the first and second oil inlets stop supplying oil, since the first and second oil inlets no longer apply oil pressure to the steel ball in the valve block, the steel ball isolates the detection oil circuit from the external air pressure under the action of the spring and the oil pressure in the detection oil circuit. This invention can quickly release pressure through the connection between the pressure relief port and the oil drain hole, thereby eliminating the back pressure in the detection oil circuit, balancing the pressure during the next oil supply, and preventing the situation where the external air pressure cannot push the steel ball open when the first oil inlet or / and the second oil inlet supply oil due to the presence of back pressure in the detection oil circuit.

[0024] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0025] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the invention and, together with their description, serve to explain the principles of the invention.

[0026] Figure 1 This is a front view of a shuttle valve with back pressure elimination function disclosed in this invention;

[0027] Figure 2 This is a rear view of a shuttle valve with back pressure relief function disclosed in this invention;

[0028] Figure 3 This is a cross-sectional view of a shuttle valve with back pressure relief function disclosed in this invention;

[0029] Figure 4 This is a partial enlarged view of a shuttle valve with back pressure relief function disclosed in this invention;

[0030] Figure 5 This is a diagram showing the working state of the first oil inlet of a shuttle valve with back pressure elimination function disclosed in this invention.

[0031] Figure 6 This is a diagram showing the working state of the second oil inlet of a shuttle valve with back pressure elimination function disclosed in this invention.

[0032] Figure 7 This is a diagram showing the working state of a shuttle valve with back pressure relief function disclosed in this invention during pressure relief.

[0033] Figure 8 This is a schematic diagram of a hydraulic system in the prior art.

[0034] Explanation of reference numerals in the attached figures:

[0035] 100-Valve body; 101-First oil inlet; 102-Second oil inlet; 103-Pressure relief port; 104-Exhaust port; 105-Gas chamber; 106-Oil chamber partition block; 107-Oil drain hole; 108-Oil storage chamber; 109-Locking screw; 110-Oil plug; 111-Valve sleeve; 112-First valve core; 113-Second valve core;

[0036] 201-Left valve block; 202-Middle valve block; 203-Right valve block; 204-Valve block screw; 205-Left end cap; 206-Right end cap; 207-Detection port; 208-Spring; 209-Steel ball; 210-Pan; 211-Sealing ring; 212-Oil groove; 213-Valve stem;

[0037] 301 - Lower valve cover; 302 - Connecting screw; 303 - Valve seat. Detailed Implementation

[0038] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0039] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0040] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0041] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0042] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0043] according to Figures 1 to 7 The present invention provides a shuttle valve with back pressure relief function, including valve body 100, upper valve cover and lower valve cover 301.

[0044] The upper valve cover includes a left valve block 201, a middle valve block 202 and a right valve block 203 connected in sequence; the bottom of the middle valve block 202 is provided with a valve stem 213, which is inserted into the valve body 100; the lower valve cover 301 is provided at the bottom of the valve body 100 to close the bottom of the valve body 100.

[0045] The valve body 100 has a valve sleeve 111 on its inner side wall. A first valve core 112 and a second valve core 113 are slidably connected between the valve sleeve 111 and the valve stem 213. The first valve core 112 is located at the upper end of the second valve core 113, and an oil chamber partition block 106 is provided between the outer side wall of the first valve core 112 and the valve sleeve 111. The first valve core 112 can push the second valve core 113 to move along the gap between the oil chamber partition block 106 and the valve stem 213.

[0046] The outer side wall of the valve body 100 is also provided with a first oil inlet 101 and a second oil inlet 102. The first oil inlet 101 is connected to the top of the first valve core 112, and the second oil inlet 102 is connected to the top of the second valve core 113. The connection between the second oil inlet 102 and the valve core is located below the oil chamber partition block 106.

[0047] The first oil inlet 101 is connected to the left valve block 201 via an oil groove 212, and the second oil inlet 102 is connected to the right valve block 203 via an oil groove 212. The middle valve block 202 and valve stem 213 are equipped with detection oil circuits that communicate with the left and right valve blocks 201 and 203, respectively. The left and right sides of the detection oil circuits are sealed by steel balls 209, and springs 208 connect the steel balls 209. The oil pressure at the first oil inlet 101 and the first oil inlet 102 can respectively push open the steel balls 209 at the left and right valve blocks 201 and 203. A detection port 207 is provided on the rear side of the middle valve block 202 to monitor the oil pressure in the detection oil circuit in real time, thereby detecting whether the pressure regulating valve is malfunctioning.

[0048] The bottom of the valve body 100 is also provided with an oil drain hole 107, and the outer side of the valve body 100 is provided with a pressure relief port 103 that penetrates the second valve core 113. When the second valve core 113 abuts against the oil chamber partition block 106, the oil drain hole 107 and the pressure relief port 103 are connected.

[0049] Furthermore, an oil storage chamber 108 is provided between the second valve core 113 and the lower valve cover 301, and a through hole is provided between the bottom of the valve stem 213 and the oil storage chamber 108. When the second valve core 113 slides downward, the pressure relief port 103 is disconnected from the oil drain hole 107, and the oil in the detection oil circuit is temporarily stored in the oil storage chamber 108. In this embodiment, the oil storage chamber 108 is located at the bottom of the second valve core 113. When the first oil inlet 101 and the second valve core 113 stop supplying oil, the oil pressure in the detection oil circuit cannot be released, and can only push the second valve core 113 to slide upward, so that the pressure relief port 103 on the valve body 100 is connected to the oil drain hole 107 on the valve stem 213.

[0050] according to Figure 5The diagram shows the working state of the first oil inlet 101 of the present invention. The arrows in the diagram indicate the direction of oil movement and the direction of oil pressure. The oil enters the pressure regulating valve through the first oil inlet 101, enters the left valve block 201 through the oil groove 212 in the left valve block 201, and squeezes the steel ball 209 on the left side so that the oil enters the detection oil circuit. At the same time, the first valve core 112 slides downward under the action of oil pressure, and simultaneously pushes the second valve core 113 to slide downward. The oil drain hole 107 on the valve stem 213 is disconnected from the pressure relief port 103 on the valve body 100. The oil pressure in the detection oil circuit increases, and the detection port 207 can detect the real-time oil pressure in the detection oil circuit.

[0051] Then according to Figure 6 The diagram shows the working state of the second oil inlet 102 of the present invention. The arrows in the diagram indicate the direction of oil movement and the direction of oil pressure. The oil enters the pressure regulating valve through the second oil inlet 102, enters the right valve block 203 through the oil groove 212 in the right valve block 203, and squeezes the steel ball 209 on the right side so that the oil enters the detection oil circuit. At the same time, the second valve core 113 slides downward under the action of oil pressure, the first valve core 112 does not move, the oil drain hole 107 on the valve stem 213 is disconnected from the pressure relief port 103 on the valve body 100, the oil pressure in the detection oil circuit increases, and the detection port 207 can detect the real-time oil pressure in the detection oil circuit.

[0052] When the first oil inlet 101 and the second oil inlet 102 stop supplying oil, according to Figure 7 The diagram shows the working state of the present invention during pressure relief. The two sides of the steel ball 209 no longer contact each other. Under the action of the spring 208 and the oil pressure in the detection oil circuit, the steel ball 209 in the middle valve block 202 isolates the detection oil circuit from the external air pressure. The oil pressure in the detection oil circuit can only push the second valve core 113 upwards until the oil drain hole 107 on the valve stem 213 connects with the pressure relief port 103 on the valve body 100. The oil and oil pressure in the detection oil circuit are quickly discharged. At this time, the oil pressure in the detection oil circuit is consistent with the external air pressure, facilitating the next oil supply.

[0053] Furthermore, the left valve block 201 and the right valve block 203 are respectively provided with a left end cap 205 and a right end cap 206. Annular pads 210 are provided between the left end cap 205 and the left valve block 201, and between the right end cap 206 and the right valve block 203. The pads 210 abut against the steel ball 209, and the side of the pad facing the steel ball 209 has a groove structure, so that the steel ball 209 can close the channel in the center of the pad 210 under the action of the spring 208. This protects the left valve block 201 and the right valve block 203, reducing wear on both. When disassembly and maintenance are required, only the pads 210 need to be replaced.

[0054] Furthermore, a sealing ring 211 is provided between the pad 210 and the left valve block 201 and the right valve block 203 to seal the detection oil circuit and prevent the oil in the detection oil circuit from overflowing.

[0055] Furthermore, the left valve block 201, the middle valve block 202, and the right valve block 203 are fastened together by laterally positioned pin sleeves and valve block screws 204. This makes the upper valve cover a detachable connection, which is more convenient for disassembling and maintaining the pressure regulating valve.

[0056] Furthermore, the lower valve cover 301 is fastened to the valve body 100 by the valve seat 303 and the connecting screw 302.

[0057] Furthermore, the valve body 100 is also provided with an exhaust port 104, and an air chamber 105 is provided between the oil chamber partition block 106 and the first valve core 112. The exhaust port 104 is connected to the air chamber 105 to form a breather valve structure, so that when the first valve core 112 slides down or up, the exhaust port 104 can balance the air pressure in the air chamber 105. A hollow screw is provided on the exhaust port 104, and a dust filter element is provided inside the hollow screw to prevent the exhaust port 104 from being blocked.

[0058] Furthermore, the valve body 100 is also provided with a cleaning port connected to the first oil inlet 101 and the second oil inlet 102, and the cleaning port is sealed by an oil plug 110. When the pressure relief port 103 or the oil drain hole 107 is blocked, the pressure regulating valve cannot effectively eliminate back pressure and needs to be disassembled and repaired. At this time, the oil in the pressure regulating valve can be drained and collected by removing the oil plug 110.

[0059] Furthermore, the position of the valve sleeve 111 is fixed, and there is axial sliding between the first valve core 112 and the oil chamber partition block 106. In order to prevent the misalignment of the oil chamber partition block 106 from affecting the communication between the pressure relief port 103 and the oil drain hole 107, the oil chamber partition block 106 and the valve sleeve 111 are fastened together by locking screws 109 to fix the position of the oil chamber partition block 106 and prevent the pressure regulating valve from malfunctioning due to the misalignment of the oil chamber partition block 106.

[0060] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A shuttle valve with back pressure elimination function, characterized by, The valve body, the upper valve cover and the lower valve cover are included. The upper valve cover comprises left valve block, middle valve block and right valve block which are connected in sequence. The bottom of the middle valve block is provided with a valve rod which is inserted into the valve body. The bottom of the valve body is provided with a valve seat and connecting screw. The outer wall of the valve body is provided with first oil inlet and second oil inlet. The first oil inlet is communicated with the top of the first valve core.

2. The shuttle valve with back pressure elimination function according to claim 1, characterized in that, The second oil inlet is communicated with the top of the second valve core.

3. The shuttle valve with back pressure elimination function according to claim 2, characterized in that, The second oil inlet is communicated with the valve core below the oil cavity partition block.

4. The shuttle valve with back pressure elimination function according to claim 3, characterized in that, The first oil inlet is connected with the left valve block through oil groove.

5. The shuttle valve with back pressure elimination function according to claim 4, characterized in that, The second oil inlet is connected with the right valve block through oil groove.

6. The shuttle valve with back pressure relief function according to claim 2, characterized in that, The middle valve block and the valve rod are provided with detection oil path which is communicated with the left valve block and the right valve block.

7. The shuttle valve with back pressure relief function according to claim 2, characterized in that, The left and right sides of the detection oil path are closed by steel ball.

8. The shuttle valve with back pressure elimination function according to claim 7, characterized in that, The spring is connected between the steel balls.

9. The shuttle valve with back pressure relief function according to claim 2, characterized in that, The bottom of the valve body is provided with oil discharge hole. The outer side of the valve body is provided with pressure relief port which penetrates the second valve core. When the second valve core abuts against the oil cavity partition block, the oil discharge hole is communicated with the pressure relief port. The second valve core and the lower valve cover are provided with oil storage cavity. The bottom of the valve rod and the oil storage cavity are provided with through hole. When the second valve core slides downward, the pressure relief port is disconnected with the oil discharge hole. The oil in the detection oil path is temporarily stored in the oil storage cavity. The left valve block and the right valve block are provided with left end cover and right end cover. The left end cover and the right end cover are provided with annular gasket which abuts against the steel ball. The gasket is provided with groove structure on the side facing the steel ball. The gasket is provided with sealing ring between the left valve block and the right valve block. The left valve block, the middle valve block and the right valve block are connected by lateral pin sleeve and valve block screw. The lower valve cover and the valve body are connected by valve seat and connecting screw. The valve body is provided with exhaust port. The oil cavity partition block and the first valve core are provided with air cavity. The exhaust port is connected with the air cavity. The hollow screw is provided with dust filter core to prevent the exhaust port from being blocked. The valve body is provided with cleaning port which is connected with the first oil inlet and the second oil inlet. The cleaning port is closed by oil plug.

10. The shuttle valve with back pressure relief function according to claim 2, characterized in that, The oil cavity partition block is fastened and connected with the valve sleeve through locking screws to prevent dislocation of the oil cavity partition block.

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