Reversing valve

Abstract

A valve string comprises an inner valve cylinder arranged at the inner end of a working cavity and an outer valve cylinder arranged at the outer end of the working cavity in a sleeving mode, an ejector rod is movably arranged in the outer valve cylinder in a penetrating mode, and a sealing pipe is movably arranged in the inner valve cylinder; a first column table, a second column table and a third column table of which the outer diameters are gradually reduced in sequence are convexly arranged in the circumferential directions of the inner section, the middle section and the outer section in the length direction of the sealing pipe respectively; according to the reversing valve provided by the utility model, the main body structure of the valve string is reduced into the inner valve cylinder, the outer valve cylinder, the ejector rod and the sealing pipe through the structural design, the overall structure simplification is realized through the structural design of the sealing pipe, and the first column platform, the second column platform and the third column platform of which the outer diameters are sequentially decreased are arranged on the sealing pipe; and the spring is arranged between the inner section of the sealing pipe and the bottom of the working cavity in a compressed mode, and finally the possibility of installation and machining is achieved.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic control valves, and in particular to a directional valve. Background Technology

[0002] In existing technology, the directional valve is a very important valve in hydraulic supports, and it is the core component used to control various movements of the hydraulic supports. The function of this valve group is to distribute pressurized fluid to the working cylinder chambers of the support to complete operations such as raising and lowering the cylinder, pushing the slide, moving the support, and pushing the side guard plate and limit jack.

[0003] Typically, a directional control valve has two valve strings to achieve the switching effect. During operation, the sealing rod in the valve string is controlled by the movement of the handle, thereby simultaneously closing and opening certain oil passages.

[0004] The valve string in a directional control valve has many parts to complete the installation and sealing process, which brings inconvenience to processing and installation. Utility Model Content

[0005] The main purpose of this utility model is to provide a reversing valve, which aims to solve the problem that the valve string in the reversing valve has a large number of parts to complete the installation and sealing process, which brings inconvenience to processing and installation.

[0006] To achieve the above objectives, this utility model provides a reversing valve, comprising:

[0007] The valve body has two blind working chambers spaced apart in width. An oil inlet and an oil return port are provided between the two working chambers on the valve body. A connector seat is provided at each end of the valve body in the width direction, which leads to the middle of the working chamber in the length direction.

[0008] Two valve strings include an inner valve cylinder nested inside the working chamber and an outer valve cylinder located outside the working chamber. A push rod is movably inserted inside the outer valve cylinder, and a sealing tube is movably installed inside the inner valve cylinder. The inner, middle, and outer sections of the sealing tube are respectively provided with a first, second, and third column with decreasing outer diameters. A step is provided on the inner wall of the inner valve cylinder corresponding to the second column. A spring is compressed between the inner section of the sealing tube and the bottom of the working chamber. At least one through hole is provided on the circumferential wall of the sealing tube between the second and third columns. A first oil passage is provided between the first and second columns of the inner valve cylinder, leading to the oil inlet and arranged in a ring. A second oil passage is provided between the second and third columns of the inner valve cylinder, leading to the connector seat and arranged in a ring. A third oil passage is provided at the inner end of the outer valve cylinder corresponding to the push rod, leading to the oil return port and arranged in a ring. The third oil passage is closed when the push rod is engaged with the sealing tube.

[0009] Two rotating rods are rotatably mounted on the valve body and are positioned at the outer ends of the corresponding push rods;

[0010] The handle is hinged to the valve body and is provided with two corresponding rotating rods.

[0011] Furthermore, a first annular groove is provided on the outer peripheral wall of the push rod, and a first sealing ring is provided in the first annular groove.

[0012] Furthermore, a second annular groove is provided on the inner end peripheral wall of the push rod, and a second sealing ring is provided in the second annular groove.

[0013] Furthermore, a third annular groove is provided on the outer peripheral wall of the first column, and a third sealing ring is provided in the third annular groove; a fourth annular groove is provided on the outer peripheral wall of the third column, and a fourth sealing ring is provided in the fourth annular groove.

[0014] Furthermore, the inner valve cylinder and the outer valve cylinder are provided with multiple sealing ring structures at the positions corresponding to the second and third oil passages in the longitudinal direction.

[0015] Furthermore, the spring extends into the interior of the sealing tube.

[0016] Furthermore, the inner valve cylinder is fitted over the outer valve cylinder at the connection position.

[0017] Furthermore, the inner circumference of one end of the top rod corresponding to the sealing tube is provided with a straight chamfer or a rounded chamfer.

[0018] Furthermore, the position where the second column matches the step has a straight chamfer or a rounded chamfer.

[0019] Furthermore, the connection between the outer valve cylinder and the working chamber is either a threaded connection or a screw connection.

[0020] The reversing valve provided by this utility model reduces the main structure of the valve string to an inner valve cylinder, an outer valve cylinder, a push rod, and a sealing tube through structural design. The overall structure is simplified through the structural design of the sealing tube. The sealing tube is equipped with a first column, a second column, and a third column with decreasing outer diameters in sequence. A spring is compressed between the inner section of the sealing tube and the bottom of the working chamber, which ultimately makes installation and processing possible. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the reversing valve of the first embodiment of this utility model;

[0022] Figure 2 This is a schematic diagram of the valve string in the reversing valve of the first embodiment of this utility model;

[0023] Figure 3 This is a schematic diagram of the outer valve cylinder in the reversing valve of the first embodiment of this utility model;

[0024] Figure 4 This is a schematic diagram of the inner valve cylinder in the reversing valve of the first embodiment of this utility model;

[0025] Figure 5 This is a schematic diagram of the push rod in the reversing valve of the first embodiment of this utility model;

[0026] Figure 6 This is a schematic diagram of the sealing tube in the reversing valve of the first embodiment of this utility model.

[0027] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0028] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0029] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” “the,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this specification means the presence of the stated features, integers, steps, operations, elements, units, modules, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, units, modules, components, and / or groups thereof. It should be understood that when we say an element is “connected” or “coupled” to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, “connected” or “coupled” as used herein can include wireless connection or wireless coupling. The term “and / or” as used herein includes all or any units and all combinations of one or more associated listed items.

[0030] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0031] Reference Figures 1 to 6 In one embodiment of this utility model, a reversing valve includes:

[0032] The valve body 100 has two blind working chambers spaced apart in width. An oil inlet 110 and an oil return port 120 are provided between the two working chambers on the valve body 100. A connector seat 130 is provided at each end of the valve body 100 in the width direction, which leads to the middle of the working chamber in the length direction.

[0033] Two valve strings 200 include an inner valve cylinder 210 nested inside the working chamber and an outer valve cylinder 220 located outside the working chamber. A push rod 230 is movably inserted inside the outer valve cylinder 220. A sealing tube 240 is movably installed inside the inner valve cylinder 210. The inner, middle, and outer sections of the sealing tube 240 have circumferentially protruding first pedestals 241, second pedestals 242, and third pedestals 243 with decreasing outer diameters, respectively. A step 211 is provided on the inner wall of the inner valve cylinder 210 corresponding to the second pedestal 242. A spring 250 is compressed between the inner section of the sealing tube 240 and the bottom of the working chamber. The peripheral wall of the valve cylinder 210 is provided with at least one through hole 244 between the second column 242 and the third column 243. The inner valve cylinder 210 is provided with a first oil passage 212 that leads to the oil inlet 110 and is arranged in a ring between the first column 241 and the second column 242. The inner valve cylinder 210 is provided with a second oil passage 213 that leads to the connector seat 130 and is arranged in a ring between the second column 242 and the third column 243. The outer valve cylinder 220 is provided with a third oil passage 221 that leads to the oil return port 120 and is arranged in a ring at the inner end of the push rod 230. The third oil passage 221 is closed when the push rod 230 is combined with the sealing pipe 240.

[0034] Two rotating rods 300 are rotatably mounted on the valve body 100 and are positioned at the outer ends of the corresponding push rods 230;

[0035] The handle 400 is hinged to the valve body 100 and is set with two corresponding rotating rods 300.

[0036] In the prior art, the valve string in the directional valve has a large number of parts to complete the installation and sealing process, which brings inconvenience to processing and installation.

[0037] This utility model relates to a reversing valve, wherein the valve body 100 has two blind-hole working chambers spaced apart in the width direction. An oil inlet 110 and an oil return port 120 are provided on the valve body 100 between the two working chambers. A connector seat 130 is provided at each end of the valve body 100 in the width direction, leading to the middle of the working chamber in the length direction.

[0038] Two valve strings 200 are provided, installed in the working chamber, including an inner valve cylinder 210 nested inside the working chamber and an outer valve cylinder 220 located outside the working chamber. A push rod 230 is movably inserted inside the outer valve cylinder 220, with its outer end protruding out of the outer valve cylinder 220. A sealing tube 240 is movably installed inside the inner valve cylinder 210. The inner, middle, and outer sections of the sealing tube 240 are respectively provided with a first pedestal 241, a second pedestal 242, and a third pedestal 243 with decreasing outer diameters in the circumferential direction. The columnar pedestals 241, 242, and 243 refer to the overall shape and are not limited to being strictly columnar. A step 211 is provided on the inner wall of the inner valve cylinder 210 corresponding to the second pedestal 242. When the second pedestal 242 and the step 211 are engaged, a seal is formed between them. A spring 250 is compressed between the inner section of the sealing tube 240 and the bottom of the working chamber. A first oil passage 212, circumferentially arranged and connecting to the oil inlet 110, is provided between the inner valve cylinder 210 and the first and second pillars 241 and 242. The first oil passage 212 can be multiple oil holes spaced apart circumferentially and connected by an annular oil groove. A second oil passage 213, circumferentially arranged and connecting to the connector seat 130, is provided between the inner valve cylinder 210 and the second and third pillars 242 and 243. The second oil passage 213 can be multiple oil holes spaced apart circumferentially and connected by an annular oil groove. A third oil passage 221, circumferentially arranged and connecting to the return oil port 120, is provided at the inner end of the outer valve cylinder 220 corresponding to the push rod 230. The third oil passage 221 can be multiple oil holes spaced apart circumferentially and connected by an annular oil groove.

[0039] Two rotating rods 300 are respectively rotatably installed on the valve body 100 and are set at the outer end of the corresponding push rod 230.

[0040] The handle 400 is hinged to the valve body 100 and is configured to correspond to two rotating rods 300. A cam can be provided at one end of the handle 400 corresponding to the rotating rod 300. The cam interacts with the rotating rod 300, and these interactions are alternating. For example, pressing down one rotating rod 300 releases the other rotating rod 300.

[0041] During operation, when neither of the two push rods 230 is pressed down, both connector seats 130 are connected to the oil return port 120. When the upper rotating rod 300 is pressed down, the push rod 230 engages with the sealing pipe 240. At this time, the third oil passage 221 is closed, pushing the sealing pipe 240 inward. The seal between the second column 242 and the step 211 is lost, and the fluid in the oil inlet 110 flows through the first oil passage 212 and the second oil passage 213 from the upper connector seat 130. The same logic applies when the lower rotating rod 300 is pressed down.

[0042] In summary, through structural design, the main structure of the valve string 200 is reduced to an inner valve cylinder 210, an outer valve cylinder 220, a push rod 230, and a sealing tube 240. The overall structure is simplified through the structural design of the sealing tube 240. The sealing tube 240 is equipped with a first column 241, a second column 242, and a third column 243 with sequentially decreasing outer diameters. A compression spring 250 is installed between the inner section of the sealing tube 240 and the bottom of the working chamber, which ultimately makes installation and processing possible.

[0043] Reference Figure 5 In one embodiment, a first annular groove is provided on the outer peripheral wall of the push rod 230, and a first sealing ring 231 is provided in the first annular groove.

[0044] In this embodiment, the sealing ring between the push rod 230 and the outer valve cylinder 220 is disposed on the push rod 230, and the machining difficulty is reduced when the first annular groove is disposed on the push rod 230 compared to when it is disposed on the outer valve cylinder 220. The number of first annular grooves is at least one, and preferably multiple.

[0045] Reference Figure 5 In one embodiment, a second annular groove is provided on the inner end peripheral wall of the push rod 230, and a second sealing ring 232 is provided in the second annular groove.

[0046] In this embodiment, the sealing ring between the push rod 230 and the outer valve cylinder 220 is disposed on the push rod 230, and the machining difficulty is reduced when the second annular groove is disposed on the push rod 230 compared to when it is disposed on the outer valve cylinder 220. The number of second annular grooves is at least one, and preferably multiple.

[0047] Reference Figure 6 In one embodiment, a third annular groove is provided on the outer peripheral wall of the first column 241, and a third sealing ring 245 is provided in the third annular groove; a fourth annular groove is provided on the outer peripheral wall of the third column 243, and a fourth sealing ring 246 is provided in the fourth annular groove.

[0048] In this embodiment, the third sealing ring 245 and the fourth sealing ring 246 are disposed on the sealing tube 240, which ensures the performance while reducing the processing difficulty.

[0049] Reference Figure 2 In one embodiment, the inner valve cylinder 210 and the outer valve cylinder 220 are provided with multiple sealing ring structures in the length direction at positions corresponding to the second oil passage 213 and the third oil passage 221.

[0050] In this embodiment, the addition of multiple sealing rings reduces the risk of leakage in the second oil passage 213 and the third oil passage 221 during operation.

[0051] Reference Figures 1 to 2In one embodiment, the spring 250 extends into the interior of the sealing tube 240.

[0052] In this embodiment, the spring 250 is inserted into the interior of the sealing tube 240, thereby making the operation of the spring 250 more stable. The inner wall of the sealing tube 240 is provided with a concave step structure, thereby providing a basis for the installation of the spring 250.

[0053] Reference Figures 1 to 2 In one embodiment, the inner valve cylinder 210 is sleeved outside the outer valve cylinder 220 at the connection position.

[0054] In this embodiment, since the third oil passage 221 on the outer valve cylinder 220 is positioned in the direction of the inner valve cylinder 210, the inner valve cylinder 210 wraps around the outer valve cylinder 220 at the position where it connects with the outer valve cylinder 220, making it less likely to interfere with the setting of the third oil passage 221, thus providing a basis for saving space.

[0055] In one embodiment, the inner circumference of one end of the push rod 230 corresponding to the sealing tube 240 is provided with a straight chamfer or a rounded chamfer.

[0056] In this embodiment, considering that a seal needs to be formed in the circumferential direction when the push rod 230 contacts the sealing tube 240, the above chamfering method can improve the sealing effect between the push rod 230 and the sealing tube 240.

[0057] In one embodiment, the position where the second column 242 matches the step 211 has a straight chamfer or a rounded chamfer.

[0058] In this embodiment, considering that a seal needs to be formed in the circumferential direction when the second column 242 contacts the step 211, the above chamfering method can improve the sealing effect between the second column 242 and the step 211.

[0059] In one embodiment, the outer valve cylinder 220 is connected to the working chamber by a threaded connection or a screw connection.

[0060] In this embodiment, a convenient connection method for the outer valve cylinder 220 to the valve body 100 is provided, which has the advantages of simplicity and high sealing performance. In the threaded connection method, an external thread is provided on the outer peripheral wall of the outer end of the outer valve cylinder 220, and an internal thread is provided at the corresponding position of the working cavity, so that a threaded connection can be formed between the two; or in the screw connection method, multiple through holes are provided on the outer circumference of the outer end of the outer valve cylinder 220, and the screw passes through the through holes to fix the outer valve cylinder 220 to the valve body 100. A corresponding sealing structure can be provided at the connection position between the outer valve cylinder 220 and the valve body 100.

[0061] In summary, the reversing valve provided by this utility model, through structural design, reduces the main structure of the valve string 200 to an inner valve cylinder 210, an outer valve cylinder 220, a push rod 230, and a sealing tube 240. The overall structure is simplified through the structural design of the sealing tube 240. The sealing tube 240 is provided with a first column 241, a second column 242, and a third column 243 with decreasing outer diameters in sequence. A compression spring 250 is installed between the inner section of the sealing tube 240 and the bottom of the working chamber, ultimately enabling installation and processing.

[0062] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the content of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A reversing valve, characterized in that, include: The valve body has two blind working chambers spaced apart in width. An oil inlet and an oil return port are provided between the two working chambers on the valve body. A connector seat is provided at each end of the valve body in the width direction, which leads to the middle of the working chamber in the length direction. Two valve strings include an inner valve cylinder nested inside the working chamber and an outer valve cylinder located outside the working chamber. A push rod is movably inserted inside the outer valve cylinder, and a sealing tube is movably installed inside the inner valve cylinder. The inner, middle, and outer sections of the sealing tube are respectively provided with a first, second, and third column with decreasing outer diameters. A step is provided on the inner wall of the inner valve cylinder corresponding to the second column. A spring is compressed between the inner section of the sealing tube and the bottom of the working chamber. At least one through hole is provided on the circumferential wall of the sealing tube between the second and third columns. A first oil passage is provided between the first and second columns of the inner valve cylinder, leading to the oil inlet and arranged in a ring. A second oil passage is provided between the second and third columns of the inner valve cylinder, leading to the connector seat and arranged in a ring. A third oil passage is provided at the inner end of the outer valve cylinder corresponding to the push rod, leading to the oil return port and arranged in a ring. The third oil passage is closed when the push rod is engaged with the sealing tube. Two rotating rods are rotatably mounted on the valve body and are positioned at the outer ends of the corresponding push rods; The handle is hinged to the valve body and is provided with two corresponding rotating rods.

2. The reversing valve according to claim 1, characterized in that, A first annular groove is provided on the outer peripheral wall of the push rod, and a first sealing ring is provided in the first annular groove.

3. The reversing valve according to claim 2, characterized in that, A second annular groove is provided on the inner end peripheral wall of the push rod, and a second sealing ring is provided in the second annular groove.

4. The reversing valve according to any one of claims 1 to 3, characterized in that, A third annular groove is provided on the outer peripheral wall of the first column, and a third sealing ring is provided in the third annular groove; a fourth annular groove is provided on the outer peripheral wall of the third column, and a fourth sealing ring is provided in the fourth annular groove.

5. The reversing valve according to any one of claims 1 to 3, characterized in that, The inner valve cylinder and the outer valve cylinder are provided with multiple sealing ring structures at the positions corresponding to the second and third oil passages in the length direction.

6. The reversing valve according to any one of claims 1 to 3, characterized in that, The spring extends into the inside of the sealing tube.

7. The reversing valve according to any one of claims 1 to 3, characterized in that, The inner valve cylinder is fitted over the outer valve cylinder at the connection point.

8. The reversing valve according to any one of claims 1 to 3, characterized in that, The inner circumference of the end of the top rod corresponding to the sealing tube is provided with a straight chamfer or a rounded chamfer.

9. The reversing valve according to any one of claims 1 to 3, characterized in that, The second column and the step are positioned with either a straight chamfer or a rounded chamfer.

10. The reversing valve according to any one of claims 1 to 3, characterized in that, The outer valve cylinder is connected to the working chamber by either a threaded connection or a screw connection.

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