An ultra-high pressure dynamic valve

Abstract

The present invention relates to an ultra-high pressure dynamic valve, comprising a valve block, a cover plate connected to the valve block, a receiving chamber formed by the cooperation between the valve block and the cover plate, a valve sleeve located inside the receiving chamber, a valve core extending into the valve sleeve, a spring connected to the valve core, an adjusting rod connected to the valve core, a valve sleeve seal for sealing the valve sleeve, a valve core seal for sealing the valve core, and a pilot solenoid valve for controlling the movement of the valve core. The ultra-high pressure dynamic valve provided by the present invention can have a working pressure as high as 100MPa, while the control pressure only needs to be below 20MPa. The design of this hydraulic system only requires partial design of ultra-high pressure, which effectively reduces the cost of the hydraulic system; on the other hand, the control pressure only needs to be below 20MPa, and can be controlled by an ordinary pilot solenoid valve, which reduces the difficulty and cost.

Description

Technical Field

[0001] The present invention relates to the technical field of dynamic valve equipment, and in particular to an ultra-high pressure dynamic valve. Background Art

[0002] The common valve structure used for hydraulic presses is the cartridge valve. The cartridge valve is usually used with a pilot solenoid valve as a large flow two-way switch valve, and the pilot solenoid valve controls the main valve to be painted or closed. The closing is controlled by the pilot solenoid valve, which is an active action; while the opening is driven by the cavity pressure oil to push the main valve core to open, which requires a certain opening pressure, so it is a passive action. Generally, this type of cartridge valve cannot be used for ultra-high pressure, and can only be used in tooth systems below 35MPa, because this type of valve has the following problems:

[0003] 1. Due to the area ratio of each cavity of the valve, if it is used for ultra-high pressure (generally higher than 100MPa), the control pressure must reach a very high pressure (far more than 35MPa) to ensure that the main valve core is reliably closed. However, the pressure-bearing capacity of ordinary pilot solenoid valves cannot exceed 35MPa. Therefore, the working pressure of existing cartridge valves is low, generally not exceeding 35MPa.

[0004] 2. Cartridge valves generally use a sealing structure with an ordinary rubber O-ring and a retaining ring, and their maximum working pressure does not exceed 42MPa; and the valve core of the cartridge valve is not sealed, and there is leakage between the control chamber and the main valve chamber.

[0005] 3. The valve core of a conventional cartridge valve cannot be opened actively in the working state. The main valve chamber must have a certain working pressure to open it, which will form back pressure in the system. This is determined by the structure of the cartridge valve. A certain working pressure in the main valve chamber is required to push the valve core to open. If it is used to relieve pressure in the main oil cylinder, it cannot relieve pressure to 0, which cannot meet market demand.

[0006] Based on the various deficiencies of the existing cartridge valves, it is necessary to propose a new valve structure to solve the above problems.

[0007] The present invention proposes an ultra-high pressure dynamic valve, the working pressure of which is ultra-high pressure and the control pressure of which is medium-low pressure. The valve can be controlled by a pilot solenoid valve, thereby effectively reducing the cost of the hydraulic system. Summary of the invention

[0008] The technical problem to be solved by the present invention is to provide an ultra-high pressure dynamic valve with an ultra-high pressure working pressure and a medium-low pressure control pressure. The valve can be controlled by a pilot solenoid valve, thereby effectively reducing the cost of the hydraulic system.

[0009] In order to solve the above technical problems, the present invention proposes an ultra-high pressure dynamic valve, comprising a valve block, a cover plate connected to the valve block, an accommodating cavity formed by the cooperation between the valve block and the cover plate, a valve sleeve located inside the accommodating cavity, a valve core extending into the valve sleeve, a spring connected to the valve core, an adjusting rod connected to the valve core, a valve sleeve seal for sealing the valve sleeve, a valve core seal for sealing the valve core, and a pilot solenoid valve for controlling the movement of the valve core;

[0010] The valve sleeve seal comprises an ultra-high pressure valve sleeve seal and a normal pressure valve sleeve seal;

[0011] The valve core seal comprises an ultra-high pressure valve core seal and a normal pressure valve core seal.

[0012] Preferably, a first chamber and a second chamber are provided on the valve block, and the first chamber and the second chamber are respectively communicated with the accommodating chamber.

[0013] Preferably, the cover plate is provided with an adjustment rod mounting position, a first control oil circuit and a second control oil circuit;

[0014] The shape and size of the accommodating cavity match the shape and size of the valve sleeve.

[0015] Preferably, the valve sleeve is a hollow shell structure, which includes a third chamber for installing the valve core, a first flow hole connecting the first chamber and the third chamber, and a second flow hole connecting the second chamber and the third chamber.

[0016] Preferably, the inner wall of the third chamber is provided with a first step structure;

[0017] A second step structure is provided on the outer wall of the valve core, and the second step structure cooperates with the first step structure to form a first control chamber inside the third chamber;

[0018] The valve core divides the third chamber into a second control chamber and a hydraulic chamber, and the hydraulic chamber is connected to the first chamber through the first flow hole;

[0019] The first control chamber, the second control chamber and the hydraulic chamber are separated from each other.

[0020] Preferably, a mounting hole is further provided on one end of the valve core away from the hydraulic chamber;

[0021] The spring is sleeved on the outside of the adjusting rod, and both the spring and the adjusting rod extend into the interior of the mounting hole.

[0022] Preferably, the adjustment rod extends into the mounting hole and extends out of the cover plate through the adjustment rod mounting position;

[0023] The ultra-high pressure dynamic valve further comprises an adjusting rod sealing member, wherein the adjusting rod sealing member is sleeved on the outer periphery of the adjusting rod and protrudes out of the surface of the adjusting rod.

[0024] Preferably, the ultra-high pressure valve sleeve seal is made of high-hardness polyurethane material, which is sleeved on the outer periphery of the valve sleeve and protrudes from the surface of the valve sleeve, and there are two of them, namely, ultra-high pressure valve sleeve seal a and ultra-high pressure valve sleeve seal b;

[0025] The ultra-high pressure valve sleeve seal a is located between the first chamber and the second chamber, and the ultra-high pressure valve sleeve seal b is located between the second chamber and the first control chamber;

[0026] The normal pressure valve sleeve sealing member is sleeved on the outer periphery of the valve sleeve and is located between the first control chamber and the second control chamber.

[0027] Preferably, the ultra-high pressure valve core seal is made of high-hardness polyurethane material, is sleeved on the outer periphery of the valve core and protrudes outside the surface of the valve core, and is located between the hydraulic chamber and the first control chamber;

[0028] The normal pressure valve core sealing member is sleeved on the outer periphery of the valve core and is located between the first control chamber and the second control chamber.

[0029] Preferably, the pilot solenoid valve comprises a first output end and a second output end;

[0030] The first output end is connected to the first control chamber through the first control oil circuit;

[0031] The second output end is communicated with the second control chamber through the second control oil circuit.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. The ultra-high pressure dynamic valve provided by the present invention can have a working pressure as high as 100MPa, while the control pressure only needs to be below 20MPa. The design of this hydraulic system only requires partial design of ultra-high pressure, which effectively reduces the cost of the hydraulic system. On the other hand, the control pressure only needs to be below 20MPa, and an ordinary pilot solenoid valve can be used for control, which reduces the difficulty and cost.

[0034] 2. The ultra-high pressure dynamic valve of the present invention adopts ultra-high pressure sealing for the valve core and valve sleeve, and there will be no internal leakage between the control chamber (i.e. the first control chamber and the second control chamber) and the main valve chamber (i.e. the first chamber and the second chamber), thus achieving zero leakage and reducing energy loss.

[0035] 3. The ultra-high pressure dynamic valve of the present invention can be opened independently by the valve core through the pilot solenoid valve. The valve core oil circuit has no minimum pressure limit and can release the oil circuit pressure to 0. It is especially useful when the main oil cylinder pressure of the hydraulic press needs to be released to zero. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic diagram of the structure of the ultra-high pressure dynamic valve provided by the present invention;

[0037] Figure 2 A schematic diagram of the structure of the ultra-high pressure dynamic valve provided by the present invention without a valve block, a cover plate, an adjusting rod and a pilot solenoid valve;

[0038] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0039] Figure 4 for Figure 2 Enlarged view of point B in the middle. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0041] like Figure 1-2 As shown, an ultra-high pressure dynamic valve comprises a valve block 1, a cover plate 2 connected to the valve block 1, an accommodating cavity formed by the cooperation between the valve block 1 and the cover plate 2, a valve sleeve 3 located inside the accommodating cavity, a valve core 4 extending into the valve sleeve 3, a spring 5 connected to the valve core 4, an adjusting rod 6 connected to the valve core 4, a valve sleeve seal 7 for sealing the valve sleeve 3, a valve core seal 8 for sealing the valve core 4, and a pilot solenoid valve 9 for controlling the movement of the valve core 4;

[0042] The valve sleeve seal 7 includes an ultra-high pressure valve sleeve seal 71 and a normal pressure valve sleeve seal 72;

[0043] The valve core seal 8 includes an ultra-high pressure valve core seal 81 and a normal pressure valve core seal 82 .

[0044] The valve block 1 cooperates with the cover plate 2 to form a receiving cavity therein, so as to facilitate accommodating the valve sleeve 3, valve core 4, spring 5 and adjusting rod 6 in the receiving cavity to realize the assembly of the ultra-high pressure dynamic valve.

[0045] In order to realize the switching of the liquid, the valve block 1 is further provided with a first chamber 11 and a second chamber 12, which are respectively connected to the accommodating cavity, so as to realize the switching of the first chamber 11 and the second chamber 12 through the valve sleeve 3 and the valve core 4.

[0046] The cover plate 2 is connected to the valve block 1, and cooperates with the valve block 1 to realize the installation of the valve sleeve 3 and the valve core. An adjusting rod installation position 21, a first control oil circuit 22 and a second control oil circuit 23 are provided thereon. The adjusting rod installation position 21 is used to realize the installation of the adjusting rod 6.

[0047] The accommodating cavity is a cavity formed by the cover plate 2 and the valve block 1 matching each other, and its shape and size match those of the valve sleeve 3 .

[0048] The valve sleeve 3 is located inside the accommodating cavity, and cooperates with the valve core 4 to realize the opening or closing of the liquid. The valve sleeve 3 is a hollow shell structure, which includes a third chamber 31 for installing the valve core 4, a first flow hole 32 connecting the first chamber 11 and the third chamber 31, and a second flow hole 33 connecting the second chamber 12 and the third chamber 31, so as to facilitate the control of the opening or closing of the liquid through the valve core 4.

[0049] like Figure 3 As shown, in order to facilitate the pilot solenoid valve 9 to control the movement of the valve core 4 , a first step structure 34 is provided on the inner wall of the third chamber 31 .

[0050] The valve core 4 is located inside the third chamber 31, and is an integral structure. The length of the valve core 4 is smaller than that of the third chamber 31, and a second step structure 41 is provided on the outer wall of the valve core 4. The second step structure 41 cooperates with the first step structure 34 to form a first control chamber 42, and a second control chamber 43 and a hydraulic chamber 44 are respectively formed at both ends of the valve core 4, and the hydraulic chamber 44 is connected with the first chamber 11 through the first circulation hole 32; that is, the valve core 4 divides the third chamber 31 into a second control chamber 43 and a hydraulic chamber 44, and the first step structure 34 and the second step structure 41 form a first control chamber 42 separated from the second control chamber 43 and the hydraulic chamber 44 inside the third chamber 31, and the advance and retreat movement of the valve core 4 is controlled by the first control chamber 42 and the second control chamber 43, and the opening or closing of the liquid is realized by the hydraulic chamber 44.

[0051] In order to achieve fixed installation of the spring 5 and the adjusting rod 6, a mounting hole 45 is further provided on the end of the valve core 4 away from the hydraulic chamber 44, and the spring 5 and the adjusting rod 6 both extend into the mounting hole 45 to achieve adjustment of the valve core 4.

[0052] The spring 5 is sleeved on the outside of the adjusting rod 6, one end of which contacts the bottom of the mounting hole 45, and the other end contacts the cover plate 2, to ensure that the valve core 4 interacts with the spring 5 during movement to achieve the return movement of the valve core 4.

[0053] The regulating rod 6 extends into the mounting hole 45 and extends out of the cover plate 2 through the regulating rod mounting position 21 , so as to facilitate the adjustment of the flow rate of the ultra-high pressure dynamic valve through the regulating rod 6 .

[0054] In order to achieve sealing between the adjusting rod 6 and the cover plate 2, an adjusting rod seal 61 is also provided. The adjusting rod seal 61 is sleeved on the outer periphery of the adjusting rod 6 and protrudes beyond the surface of the adjusting rod 6, thereby achieving sealing between the adjusting rod 6 and the cover plate 2 and preventing the control medium inside the second control chamber 43 from overflowing from the gap between the cover plate 2 and the adjusting rod 6.

[0055] The valve sleeve seal 7 is used to achieve the sealing of the valve sleeve, and includes an ultra-high pressure valve sleeve seal 71 and a normal pressure valve sleeve seal 72. The ultra-high pressure valve sleeve seal 71 has a minimum pressure bearing capacity of 100 MPa and is made of high-hardness polyurethane material. The ultra-high pressure valve sleeve seal 71 is sleeved on the outer periphery of the valve sleeve 4 and protrudes from the surface of the valve sleeve 4 to achieve the sealing between the valve block 1 and the valve sleeve 3. Specifically, as Figure 4 As shown, the ultra-high pressure valve sleeve seal 71 includes a main seal ring 711 and a retaining ring 712. A protrusion is provided in the middle of the main seal ring 711, that is, the cross section of the main seal ring 711 is in a "convex" shape. There are two retaining rings 712, which are respectively located on both sides of the protrusion. Through the double sealing structure of the ultra-high pressure valve sleeve seal, the pressure borne by the sealing structure is increased to achieve the sealing of the ultra-high pressure dynamic valve. There are two ultra-high pressure valve sleeve seals 71, namely, ultra-high pressure valve sleeve seal a71a and ultra-high pressure valve sleeve seal b71b, wherein the ultra-high pressure valve sleeve seal a71a is located between the first chamber 11 and the second chamber 12 to achieve the sealing between the first chamber 11 and the second chamber 12; the ultra-high pressure valve sleeve seal b71b is located between the second chamber 12 and the first control chamber 42 to achieve the sealing between the second chamber 12 and the first control chamber 42. The pressure bearing capacity of the atmospheric pressure valve sleeve seal 72 is about 35 MPa. It is sleeved on the outer periphery of the valve sleeve 3 and located between the first control chamber 42 and the second control chamber 43 to achieve sealing between the first control chamber 42 and the second control chamber 43.

[0056] The valve core seal 8 is used to achieve the sealing of the valve core 4, and includes an ultra-high pressure valve core seal 81 and a normal pressure valve core seal 82. The minimum pressure bearing capacity of the ultra-high pressure valve core seal 81 is 100MPa, and it is made of high hardness polyurethane material. The ultra-high pressure valve core seal 81 is sleeved on the outer periphery of the valve core 4 and protrudes outside the surface of the valve core 4 to achieve the sealing between the valve core 4 and the valve sleeve 3. Specifically, the structure of the ultra-high pressure valve sleeve seal is the same as that of the ultra-high pressure valve core seal, which is not repeated here. The ultra-high pressure valve core seal 81 is located between the hydraulic chamber 44 and the first control chamber 42 to achieve the sealing between the hydraulic chamber 44 and the first control chamber 42. The pressure bearing capacity of the normal pressure valve core seal 82 is about 35MPa. It is sleeved on the outer periphery of the valve core 4 and located between the first control chamber 11 and the second control chamber 12 to achieve the sealing between the first control chamber 42 and the second control chamber 43.

[0057] The pilot solenoid valve 9 is used to control the movement of the valve core 4, and includes a first output end and a second output end. The first output end is connected to the first control chamber 42 through the first control oil circuit 22, and the second output end is connected to the second control chamber 43 through the second control oil circuit 23, so as to facilitate the control of the movement of the valve core 4 through the pilot solenoid valve 9.

[0058] When the ultra-high pressure dynamic valve provided by the present invention is in operation, the first output end of the pilot solenoid valve 9 is opened, and the control medium enters the first control chamber 42, the volume of the second control chamber 43 decreases, and the volume of the hydraulic chamber 44 increases, until the hydraulic chamber 44 connects the first chamber 11 and the second chamber 12, thereby realizing the opening action of the ultra-high pressure dynamic valve.

[0059] If the ultra-high pressure dynamic valve is used to close the flow of liquid, the second output end of the pilot solenoid valve 9 is opened, and the control medium enters the second control chamber 43, the volume of the second control chamber 43 increases, and the volume of the hydraulic chamber 44 decreases, until the valve core 4 completely isolates the first chamber 11 from the second chamber 12, thereby realizing the closing action of the ultra-high pressure dynamic valve.

[0060] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. An ultra-high pressure dynamic valve, characterized in that: It comprises a valve block, a cover plate connected to the valve block, a receiving cavity formed by the cooperation between the valve block and the cover plate, a valve sleeve located inside the receiving cavity, a valve core extending into the valve sleeve, a spring connected to the valve core, an adjusting rod connected to the valve core, a valve sleeve seal for sealing the valve sleeve, a valve core seal for sealing the valve core, and a pilot solenoid valve for controlling the movement of the valve core; The valve sleeve seal comprises an ultra-high pressure valve sleeve seal and a normal pressure valve sleeve seal; The valve core seal comprises an ultra-high pressure valve core seal and a normal pressure valve core seal; The valve block is provided with a first chamber and a second chamber, and the first chamber and the second chamber are respectively communicated with the accommodating chamber; The valve sleeve is a hollow shell structure, which includes a third chamber for mounting the valve core; The inner wall of the third chamber is provided with a first step structure; A second step structure is provided on the outer wall of the valve core, and the second step structure cooperates with the first step structure to form a first control chamber inside the third chamber; The valve core divides the third chamber into a second control chamber and a hydraulic chamber, and the hydraulic chamber is connected to the first chamber through a first flow hole; The first control chamber, the second control chamber and the hydraulic chamber are separated from each other; The ultra-high pressure valve sleeve sealing member is sleeved on the outer periphery of the valve sleeve and protrudes outside the surface of the valve sleeve; The ultra-high pressure valve core sealing member is sleeved on the outer periphery of the valve core and protrudes out of the surface of the valve core, and is located between the hydraulic chamber and the first control chamber.

2. The ultra-high pressure dynamic valve according to claim 1, characterized in that: The cover plate is provided with an adjusting rod mounting position, a first control oil circuit and a second control oil circuit; The shape and size of the accommodating cavity match the shape and size of the valve sleeve.

3. The ultra-high pressure dynamic valve according to claim 2, characterized in that: The valve sleeve includes a first flow hole communicating with the first chamber and the third chamber, and a second flow hole communicating with the second chamber and the third chamber.

4. The ultra-high pressure dynamic valve according to claim 1, characterized in that: A mounting hole is also provided on one end of the valve core away from the hydraulic chamber; The spring is sleeved on the outside of the adjusting rod, and both the spring and the adjusting rod extend into the interior of the mounting hole.

5. The ultra-high pressure dynamic valve according to claim 4, characterized in that: The adjusting rod extends into the mounting hole and extends out of the cover plate through the adjusting rod mounting position; The ultra-high pressure dynamic valve further comprises an adjusting rod sealing member, wherein the adjusting rod sealing member is sleeved on the outer periphery of the adjusting rod and protrudes out of the surface of the adjusting rod.

6. The ultra-high pressure dynamic valve according to claim 1, characterized in that: The ultra-high pressure valve sleeve seal is made of high-hardness polyurethane material, and there are two of them, namely, ultra-high pressure valve sleeve seal a and ultra-high pressure valve sleeve seal b; The ultra-high pressure valve sleeve seal a is located between the first chamber and the second chamber, and the ultra-high pressure valve sleeve seal b is located between the second chamber and the first control chamber; The normal pressure valve sleeve sealing member is sleeved on the outer periphery of the valve sleeve and is located between the first control chamber and the second control chamber.

7. The ultra-high pressure dynamic valve according to claim 1, characterized in that: The ultra-high pressure valve core seal is made of high hardness polyurethane material; The normal pressure valve core sealing member is sleeved on the outer periphery of the valve core and is located between the first control chamber and the second control chamber.

8. The ultra-high pressure dynamic valve according to claim 1, characterized in that: The pilot solenoid valve comprises a first output end and a second output end; The first output end is connected to the first control chamber through a first control oil circuit; The second output end is communicated with the second control chamber through a second control oil circuit.

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