Relief valve

Abstract

The present invention relates to a relief valve, which comprises: a valve body; a valve seat, which is mounted on the valve body; a valve cover, which is mounted on the top of the valve seat and is used to cover the top opening of the valve seat; a transmission mechanism, which comprises a crank, a rocker and a transmission main shaft, the transmission main shaft is rotatably arranged on the valve body, the bending part of the crank and one end of the rocker are both rotatably connected to the transmission main shaft, and the other end of the rocker is hinged to the valve cover; a driving mechanism, which is mounted on the valve body and connected to one end of the crank, the driving mechanism can drive the crank to rotate and drive the rocker to rotate through the crank, thereby driving the valve cover to move to open or close the second valve chamber; a disc spring cylinder, which is rotatably mounted on the valve body through a connecting rod and is hinged to the other end of the crank, when the driving mechanism drives the crank to rotate, it can drive the disc spring cylinder to rotate, and apply pressure to the valve cover to make it seal to the valve seat. The relief valve of the present invention is resistant to high temperature, has a small valve cover stroke, can achieve automatic and rapid relief, and can ensure long-term stable operation.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to a relief valve. Background Art

[0002] The stability of gas pressure in furnaces and pipelines is the key to the normal operation of metallurgical, chemical, energy and other systems. As a key device to stabilize the gas pressure in furnaces and pipelines, the relief valve is widely used in metallurgical, chemical, energy and other systems. As a cutting-edge technology in the steel industry, smelting reduction ironmaking has the advantages of short process, low investment and low pollution, but the gas temperature (1450℃) it produces is much higher than that of blast furnace ironmaking. The existing relief valve structure is no longer suitable for this working condition. The existing relief valve has a long valve cover stroke and a slow relief speed. When the valve is released, the high-temperature medium will flush the valve, which is easy to cause the valve to be loosely sealed and affect the use effect of the relief valve. Summary of the invention

[0003] In view of the above-mentioned problems existing in the prior art, an object of one aspect of the present invention is to provide a relief valve which, while satisfying the functions of a conventional relief valve, achieves the performance of high temperature resistance, automatic relief, small valve cover stroke, and fast relief speed, and can ensure long-term stable operation.

[0004] In order to achieve the above object, the present invention provides a relief valve, comprising:

[0005] A valve body, a first valve cavity is formed inside the valve body;

[0006] a valve seat, which is mounted on the valve body and has a second valve cavity communicated with the first valve cavity;

[0007] a valve cover, mounted on the top of the valve seat, for sealing the top opening of the second valve cavity;

[0008] A transmission mechanism, comprising a crank, a rocker and a transmission main shaft, wherein the transmission main shaft is rotatably arranged on the valve body, the bending part of the crank and one end of the rocker are both rotatably connected to the transmission main shaft, and the other end of the rocker is hinged to the valve cover;

[0009] a driving mechanism, which is mounted on the valve body and connected to one end of the crank, the driving mechanism being capable of driving the crank to rotate and driving the rocker to rotate through the crank, thereby driving the valve cover to move, so as to open or close the second valve chamber;

[0010] The disc spring cylinder is rotatably mounted on the valve body through a connecting rod and is hinged to the other end of the crank. When the driving mechanism drives the crank to rotate, the disc spring cylinder can be driven to rotate. When the disc spring cylinder rotates, a certain disc spring force can be generated to apply force to the valve cover to seal it with the valve seat when the valve cover is sealed on the valve seat.

[0011] In some embodiments, the crank includes a first crank arm and a second crank arm set at a predetermined angle, the first crank arm is hinged to the driving mechanism, and the second crank arm is hinged to the disc spring tube.

[0012] In some embodiments, the transmission mechanism also includes a crossbeam frame and a connecting plate, the crossbeam frame includes a crossbeam and connecting arms arranged at both ends of the crossbeam, the crossbeam is installed above the valve cover and connected to the valve cover through a cross hinge shaft, the connecting arm is hinged to the other end of the rocker, the connecting plate is located on one side of the rocker, one end of the connecting plate is hinged to the valve cover, and the other end of the connecting plate is hinged to the valve body, the valve cover, the crossbeam, the connecting plate and the rocker form a four-bar linkage to drive the valve cover to open or close when the crank drives the rocker to rotate.

[0013] In some embodiments, one end of the connecting rod is hinged to the valve body, and the other end of the connecting rod is hinged to the outer wall of the disc spring tube. The rotation of the crank along a first direction can drive the connecting rod and the disc spring tube to rotate in a second direction opposite to the first direction, and after the crank rotates to a certain position along the first direction, the disc spring tube drives the connecting rod to rotate in the first direction.

[0014] In some embodiments, the relief valve further includes a limiting mechanism, and the limiting mechanism is installed on the valve body to limit the rotation of the disc spring tube.

[0015] In some embodiments, the disc spring cylinder includes a cylinder body, a disc spring shaft and a disc spring. The disc spring shaft is inserted into the cylinder body and one end of the disc spring shaft extends out of the cylinder body and is connected to the other end of the crank. The disc spring is sleeved on the disc spring shaft located in the cylinder body. The disc spring shaft is provided with an abutment portion that abuts against the disc spring. When the crank rotates to drive the disc spring cylinder to rotate, the disc spring shaft can compress or release the disc spring to generate a certain disc spring force and act on the crank.

[0016] In some embodiments, the cavity wall of the first valve cavity is a hollow double-layer structure, wherein the hollow portion forms a valve body water cavity, and the cavity wall is provided with a valve body water inlet and a valve body water outlet connected to the valve body water cavity; the cavity wall of the second valve cavity is a hollow double-layer structure, wherein the hollow portion forms a valve seat water cavity, and the cavity wall of the second valve cavity is provided with a valve seat water inlet and a valve seat water outlet connected to the valve seat water cavity; the valve cover is a hollow double-layer structure, wherein the hollow portion forms a valve cover water cavity, and the valve cover is provided with a valve cover water inlet and an outlet connected to the valve cover water cavity.

[0017] In some embodiments, the cavity wall of the first valve cavity is provided with a temperature-resistant heat-insulating material, the cavity wall of the second valve cavity is provided with a temperature-resistant heat-insulating material, and the inner layer of the double-layer structure of the valve cover is a high-temperature-resistant and corrosion-resistant stainless steel material.

[0018] In some embodiments, the relief valve also includes a valve cover seat, which is installed on the valve seat, and a seal is provided between the valve cover seat and the valve seat, the seal includes an annular first seal and an annular second seal, the second seal is provided on the outside of the first seal, and the two are spaced apart, the first seal is a metal seal, and the second seal is a non-metal seal.

[0019] In some embodiments, the valve seat has a valve seat sealing surface that cooperates with the first seal, and the valve seat sealing surface is a spherical surface. The valve cover seat has a valve cover sealing surface that cooperates with the first seal, and the valve cover sealing surface is a conical surface. The valve seat sealing surface and the valve cover sealing surface are sealed and connected to the first seal from opposite sides; the installation height of the first seal is higher than the installation height of the second seal.

[0020] Compared with the prior art, the relief valve provided by the present invention connects the driving mechanism and the disc spring cylinder through a crank, and connects the valve cover through a rocker to realize the opening or closing of the valve cover. At the same time, the disc spring cylinder is connected through a crank transmission, and the valve cover is sealed by the disc spring force generated when the disc spring cylinder rotates. The transmission structure is reasonable, the valve cover has a small opening and closing stroke, can realize fast and automatic relief, and can ensure long-term stable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In the drawings, which are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with letter suffixes or different letter suffixes may represent different instances of similar parts. The accompanying drawings generally illustrate various embodiments by way of example and not limitation, and together with the specification and claims, are used to illustrate the embodiments of the invention. When appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method.

[0022] Figure 1 It is a structural schematic diagram of a relief valve according to an embodiment of the present invention;

[0023] Figure 2 A schematic structural diagram of a relief valve in another direction according to an embodiment of the present invention;

[0024] Figure 3 A partial cross-sectional view of a valve body of a relief valve according to an embodiment of the present invention;

[0025] Figure 4 for Figure 3 An enlarged structural diagram of the frame A portion;

[0026] Figure 5 A side partial cross-sectional view of a valve seat and a valve cover of a relief valve according to an embodiment of the present invention;

[0027] Figure 6 for Figure 5 Cross-sectional view in the BB direction;

[0028] Figure 7 for Figure 6 A schematic diagram of the enlarged structure of the middle circle C portion;

[0029] Figure 8 A top cross-sectional view of a disc spring cylinder of a relief valve according to an embodiment of the present invention;

[0030] Fig. 9 It is a schematic diagram of a valve cover of a relief valve in a closed state according to an embodiment of the present invention;

[0031] Fig.10 It is a schematic diagram showing that the valve cover of the relief valve according to an embodiment of the present invention is in an open state.

[0032] Reference numerals:

[0033] 1-valve body, 11-first valve cavity, 12-valve body frame, 13-valve body water cavity, 14-valve body water inlet, 15-valve body water outlet, 16-connecting water pipe, 17-temperature resistant and heat-insulating material;

[0034] 2-valve seat, 21-second valve cavity, 22-valve seat water cavity, 23-valve seat water inlet, 24-valve seat water outlet, 25-temperature resistant and heat-insulating material, 26-support ring, 27-pressure cover, 28-valve seat sealing surface;

[0035] 3-valve cover, 31-valve cover water cavity, 32-valve cover water inlet and outlet;

[0036] 41-crank, 411-first crank arm, 412-second crank arm; 42-rocker; 43-transmission main shaft; 44-crossbeam frame, 441-crossbeam, 442-connecting arm; 45-connecting plate, 46-cross hinge shaft, 47-hinged part;

[0037] 5-driving mechanism, 51-piston rod; 6-disc spring cylinder, 61-cylinder body, 62-disc spring shaft, 621-abutment portion, 622-output end, 63-disc spring, 64-adjusting nut, 65-dust cover; 7-connecting rod; 8-limiting mechanism; 9-valve cover seat, 91-protrusion, 92-valve cover sealing surface; 101-first sealing member, 102-second sealing member. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiment of the present invention more clear, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiment of the present invention.

[0039] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0040] In order to keep the following description of the embodiments of the present invention clear and concise, detailed descriptions of well-known functions and well-known components are omitted.

[0041] Figures 1 to 10 FIG. 1 is a schematic diagram of the structure of a relief valve according to an embodiment of the present invention. Figures 1 to 10 As shown, an embodiment of the present invention provides a relief valve, comprising:

[0042] A valve body 1, wherein a first valve chamber 11 is formed inside the valve body;

[0043] A valve seat 2 is mounted on the valve body 1 and has a second valve cavity 21 communicating with the first valve cavity 11;

[0044] A valve cover 3, which is mounted on the top of the valve seat 2 and is used to cover the top opening of the second valve chamber 21;

[0045] The transmission mechanism includes a crank 41, a rocker 42 and a transmission main shaft 43. The transmission main shaft 43 is rotatably arranged on the valve body 1. The bending part of the crank 41 and one end of the rocker 42 are both rotatably connected to the transmission main shaft 43. The other end of the rocker 42 is hinged to the valve cover 3.

[0046] A driving mechanism 5, which is mounted on the valve body 1 and connected to one end of the crank 41, and the driving mechanism 5 can drive the crank 41 to rotate and drive the rocker 42 to rotate through the crank 41, thereby driving the valve cover 3 to move, so as to open or close the second valve chamber 21;

[0047] The disc spring cylinder 6 is rotatably mounted on the valve body 1 through a connecting rod 7 and is hinged to the other end of the crank 41. When the driving mechanism 5 drives the crank 41 to rotate, the disc spring cylinder 6 can be driven to rotate. When the disc spring cylinder 6 rotates, a certain disc spring force can be generated to apply force to the valve cover 3 to seal it with the valve seat 2 when the valve cover 3 is sealed on the valve seat 2.

[0048] The relief valve can be installed at the mouth of a blast furnace or on a high-temperature pipeline. Specifically, under the normal working pressure of the relief valve, the driving mechanism 5 drives the transmission mechanism to move and drive the valve cover 3 to open or close, and the disc spring cylinder 6 performs pressure sealing on the valve cover 3; when the medium pressure in the blast furnace (or in the pipeline) is greater than the preset pressure, the valve cover 5 drives the transmission mechanism to compress the disc spring cylinder 6, so that the valve cover 5 is slightly opened, thereby realizing the automatic relief function. When the medium pressure is restored, the valve cover 3 is restored to a sealed state under the action of the disc spring cylinder 6.

[0049] The above-mentioned preset pressure is determined according to the disc spring force (disc spring force) of the disc spring tube 6 used to seal the valve cover 3, that is, the sealing force of the valve cover 3 is ensured by the disc spring force of the disc spring tube 6, and the disc spring tube 6 pushes the crank 41 to drive the rocker 42 to provide a downward sealing pressure for the valve cover 3 to overcome the medium pressure and ensure the sealing performance of the valve. When the medium pressure in the blast furnace is greater than the sealing pressure, the sealing pressure provided by the disc spring tube 6 cannot ensure the sealing of the valve cover 3 after overcoming the medium pressure of the relief valve, and the valve cover 3 will leak, realizing the automatic relief function. When a certain amount of medium in the furnace leaks, the system pressure returns to normal, and the disc spring tube 6 pushes the valve cover 3 to move. Under the pressure of the disc spring tube 6, the valve cover 3 is in a sealed state again.

[0050] The relief valve provided in the embodiment of the present invention is connected to the driving mechanism 5 and the disc spring tube 6 through a crank 41, and is connected to the valve cover 3 through a rocker 42, so as to realize the opening or closing of the valve cover 3. At the same time, the disc spring tube 6 is connected through the crank 41, and the valve cover is sealed by the disc spring force generated when the disc spring tube 6 rotates. The transmission structure is reasonable, the opening and closing stroke of the valve cover 3 is small, and rapid and automatic relief can be realized, and long-term stable operation can be guaranteed.

[0051] like Figures 1 to 3As shown, in this embodiment, the valve body 1 includes a valve body frame 12, which is arranged on one side of the first valve chamber 11 to facilitate the installation of the transmission mechanism and the drive mechanism 5. The valve body frame 12 includes two side plates arranged opposite to each other, the transmission main shaft 43 is penetrated through the two side plates, the bending part of the crank 41 is sleeved on the transmission main shaft 43 and is located between the two side plates, the rocker 42 is sleeved on the transmission main shaft 43 and is located on the outside of the two side plates, the drive mechanism 5 and the disc spring cylinder 6 are installed between the two side plates, the crank 41 includes a first crank arm 411 and a second crank arm 412 extending from the bending part in different directions, and the first crank arm 411 and the second crank arm 412 are arranged at a predetermined angle, the first crank arm 411 is hinged to the drive mechanism 5, and the second crank arm 412 is hinged to the disc spring cylinder 6, so as to realize the transmission connection between the drive mechanism 5 and the disc spring cylinder 6.

[0052] The above-mentioned predetermined angle is predetermined according to the action stroke of the driving mechanism 5, the size of the disc spring tube 6 and the connecting rod 7, etc., so as to adapt to relief valves of different specifications, and ensure a more compact structure and a more beautiful appearance while meeting the requirements for valve use.

[0053] Furthermore, the transmission mechanism also includes a crossbeam frame 44 and a connecting plate 45. The crossbeam frame 44 includes a crossbeam 441 and connecting arms 442 arranged at both ends of the crossbeam 441. The crossbeam 441 is installed above the valve cover 3 and is connected to the valve cover 3 through a cross hinge shaft 46. The connecting arm 442 is hinged to the other end of the rocker 42. The connecting plate 45 is located on one side of the rocker 42. One end of the connecting plate 45 is hinged to the valve cover 3, and the other end of the connecting plate 45 is hinged to the valve body 1. The valve cover 3, the crossbeam 44, the connecting plate 45 and the rocker 42 form a four-bar linkage to drive the valve cover 3 to open or close when the crank 41 drives the rocker 42 to rotate.

[0054] like Figure 2 As shown, the connecting plate 45 is located on the inner side of the rocker 42 and is arranged relatively parallel to the rocker 42. The valve body 1 is provided with a hinge portion 47 connected to the connecting plate 45, and the connecting plate 45 can be hinged to the hinge portion 47 through a pin. In this embodiment, two rockers 42 are arranged on the outer side of the valve body frame 12 to be respectively hinged to the outer sides of the two connecting arms 442 on both sides of the crossbeam frame 44, and correspondingly, two connecting plates 45 are arranged on the inner side of the rocker 42 to be respectively hinged to the inner sides of the two connecting arms 442. The four-bar linkage formed by the valve cover 3, the crossbeam 44, the connecting plate 45 and the rocker 42 can ensure smooth and reliable transmission, and the travel of the valve cover 3 is small, which can achieve rapid release.

[0055] like Fig. 9 and Fig.10As shown, when the driving mechanism 5 drives the rocker 42 to rotate clockwise to drive the valve cover 3 to move upward, with the cooperation of the connecting plate 45, the connecting plate 45 and the valve cover 3 rotate clockwise at the same time, so that the rotation angle of the valve cover 3 can be greater than the rotation angle of the rocker 42, that is, the valve cover 3 can be quickly opened under a small driving force, and the cooperation of the connecting plate 45 can provide a smaller rotation angle for the rotation of the rocker 42. In addition, in this embodiment, the turning radius of the valve cover 3 is small, which can reduce the impact on the valve cover 3 when it is quickly opened; and after the valve cover 3 is opened, it is completely located on one side of the valve cavity, which can completely avoid the medium release channel and prevent the high-temperature medium from scouring the valve cover 3. In this embodiment, the position of the valve cover 3 is moderate, which can not only avoid the scouring of the medium in the pipeline during release, but also ensure that the stroke of the valve cover 3 is as small as possible to achieve rapid release.

[0056] The direction of rotation of the crank 41 is the same as that of the rocker 42 and the connecting plate 45. The crank 41 rotates to drive the rocker 42 and the connecting plate 45 to rotate simultaneously to realize the opening and closing of the valve cover 3 in a normal working state.

[0057] The driving mechanism 5 can be a motor driving mechanism or a hydraulic driving mechanism. In the present embodiment, the driving mechanism 5 adopts a hydraulic cylinder, which can be a hydraulic oil cylinder or a hydraulic air cylinder. The disc spring tube 6 and the hydraulic cylinder are respectively arranged on the upper and lower sides. Compared with the motor drive, the structural arrangement is more reasonable and compact, and can reduce the space occupied by the relief valve.

[0058] like Figure 1 and Figure 2 As shown, in this embodiment, the connecting rod 7 is a plate-like structure, one end of the connecting rod 7 is hinged to the valve body 1, and the other end of the connecting rod 7 is hinged to the outer wall of the disc spring tube 6. The crank 41 rotates in a first direction to drive the connecting rod 7 and the disc spring tube 6 to rotate in a second direction opposite to the first direction, and after the crank 41 rotates to a certain position in the first direction, the connecting rod 7 is driven to rotate in the first direction through the disc spring tube 6.

[0059] Specifically, the crank 41 rotates in the first direction to drive the connecting rod 7 and the disc spring barrel 6 to rotate in the second direction opposite to the first direction, which means that the crank 41 rotates in the first direction to drive the disc spring barrel 6 to rotate in the second direction, and the disc spring barrel 6 rotates in the second direction to drive the connecting rod 7 to rotate in the second direction. Figure 1 , 2 , 9 and Fig.10As shown, a limiting mechanism 8 is provided above the connection between the crank 41 and the disc spring barrel 6. The limiting mechanism 8 is installed on the top of the valve body frame 12, which can limit the rotation of the disc spring barrel 6 and make the disc spring barrel 6 rotate around the limiting mechanism 8, that is, the limiting mechanism 8 can serve as the rotation center of the disc spring barrel 6 within a certain rotation range. The limiting mechanism 8 includes two limiting rods arranged in parallel, a certain distance is spaced between the two limiting rods, and the installation heights of the two limiting rods are different, so as to form an inclined portion, limit the disc spring barrel 6, and facilitate the rotation of the disc spring barrel 6.

[0060] like Figure 8 As shown, the disc spring cylinder 6 includes a cylinder body 61, a disc spring shaft 62 and a disc spring 63. The disc spring shaft 62 is inserted into the cylinder body 61 and one end thereof extends out of the cylinder body 61 and is connected to the other end of the crank 41. The disc spring 63 is sleeved on the disc spring shaft 62 located in the cylinder body 61. The disc spring shaft 62 is provided with an abutment portion 621 abutting against the disc spring 63. The abutment portion 621 is located in the cylinder body 61. When the crank 41 rotates to drive the disc spring cylinder 6 to rotate, the disc spring shaft 62 can compress or release the disc spring 63 to generate a certain disc spring force and act on the crank 41. One end of the disc spring shaft 62 connected to the crank 41 is the output end 622, which is hinged to the second crank arm 412, and the other end of the disc spring shaft 62 (the end away from the valve body 1) is the tail end.

[0061] like Fig. 9 and Fig.10 As shown, the working process of the relief valve provided by the embodiment of the present invention is as follows:

[0062] When the hydraulic cylinder is working, oil enters the rodless chamber of the hydraulic cylinder, causing the piston rod 51 to extend. The piston rod 51 extends to drive the crank 41 to rotate in a first direction (clockwise in this embodiment), which can drive the valve cover 3 to rotate and open in the same direction (clockwise) through the first crank arm 411 and the rocker 42. When the crank 41 rotates in the first direction, it also drives the disc spring tube 6 to rotate in the second direction (counterclockwise) through the second crank arm 412. When the disc spring tube 6 rotates, the abutment 621 of the disc spring shaft 62 compresses the disc spring 63. When the crank 41 drives the disc spring tube 6 to rotate to the first position where the center line of the first crank arm 411 is in line with the center line of the disc spring tube 6, the disc spring The cylinder 6 contacts with the limiting mechanism 8, and the compression amount of the disc spring 63 is the maximum; when the driving mechanism 5 drives the crank 41 to continue to rotate in the first direction, the disc spring cylinder 6 is driven to continue to rotate in the second direction around the limiting mechanism 8 with the limiting mechanism 8 as the rotation center. At the same time, the disc spring 63 is released until the release amount is maximum. At this time, the crank 41 rotates to the second position along the first direction, and the abutment portion 621 abuts against the end wall of the cylinder 61; when the driving mechanism 5 drives the crank 41 to continue to rotate in the first direction, the disc spring cylinder 6 does not continue to rotate with the crank 41, and the crank 41 drives the connecting rod 7 to rotate in the first direction through the disc spring cylinder 6 until the crank 41 rotates to the third position (such as the third position) that fully opens the valve cover 3. Fig.10That is, when the crank 41 rotates from the second position to the third position, the disc spring tube 6 only acts as a rigid connecting member to pull the connecting rod 7 to rotate with the crank 41.

[0063] The process of closing the valve cover 3 is opposite to the process of opening the valve cover 3 mentioned above. The hydraulic cylinder works in the reverse direction, and oil enters the rod chamber, causing the piston rod 51 to retract, driving the crank 41 (from the third position) to rotate in the second direction (counterclockwise), and driving the valve cover 3 to close through the first crank arm 411 and the rocker arm 42. When the crank 41 rotates in the second direction, it also drives the connecting rod 7 to rotate in the second direction until the second position through the second crank arm 412 and the disc spring tube 6. During this rotation process, the disc spring tube 6 is fixed (the abutment portion 621 abuts against the end wall of the cylinder body 61) and does not rotate with the crank 41, but only plays a role in pulling the connecting rod 7 to rotate; the crank 41 continues to rotate in the second direction, and the abutment portion 621 is separated from the end wall of the cylinder 61, and the rotation of the crank 41 drives the disc spring cylinder 6 and the connecting rod 7 to rotate in the first direction (clockwise), and compresses the disc spring 63 through the abutment portion 621. When the crank 41 drives the disc spring cylinder 6 to rotate to the first position where the center line of the first crank arm 411 is in line with the center line of the disc spring cylinder 6, the compression of the disc spring 63 is the largest. When the driving mechanism 5 drives the crank 41 to continue to rotate in the second direction, the disc spring 63 is released. The disc spring force generated by the release of the disc spring 63 is transmitted to the valve cover 3 through the crank 41 and the rocker 42, and when the valve cover 3 is sealed on the valve seat 2, the disc spring cylinder 6 applies a certain pressure to the valve cover 3 to seal the valve cover 3 to the valve seat 2 (such as Fig. 9 At this time, the hydraulic cylinder oil inlet and outlet ports are depressurized, the piston rod 51 of the hydraulic cylinder is in a free state, and the valve cover 3 pushes the crank 41 to drive the rocker 42 by the sealing pressure of the disc spring tube 6 to provide sealing force for the valve cover 3 to achieve the sealing of the valve.

[0064] The first direction is the direction to open the valve cover 3, and the second direction is the direction to close the valve cover 3. In this embodiment, since the transmission mechanism and the drive mechanism 5 are arranged on the right side of the valve cover 3, the first direction is the clockwise direction and the second direction is the counterclockwise direction. In other embodiments, when the transmission mechanism and the drive mechanism 5 are arranged on the left side of the valve cover 3, the first direction is the counterclockwise direction.

[0065] like Fig. 9 and Fig.10As shown, the connecting rod 7 is rotated by the disc spring tube 6. Taking the opening of the valve cover 3 as an example, when the crank 41 drives the disc spring tube 6 to rotate to the first position where the center line of the first crank arm 411 is in line with the center line of the disc spring tube 6, the connecting rod 7 is also rotated to the first position where the center line is in line with the center line of the disc spring tube 6. The line connecting the three points, the center of the transmission main shaft 43, the first hinge point of the second crank arm 412 and the disc spring tube 6, and the second hinge point of the connecting rod 7 and the valve body frame 12, is a straight line. The disc spring 63 is compressed to the maximum under the compression of the abutment portion 621. During the process of the crank 41 rotating from the initial position along the first direction (clockwise) to the first position, the connecting rod 7 It is always parallel to the disc spring cylinder 6; when the crank 41 continues to rotate, the disc spring cylinder 6 is switched from the first hinge point to the limiting mechanism 8 by the action of the limiting mechanism 8, and the disc spring cylinder 6 continues to rotate around the limiting mechanism 8, and drives the connecting rod 7 to continue to rotate. The line connecting the three points of the center of the transmission main shaft 43, the first hinge point of the second crank arm 412 and the disc spring cylinder 6, and the second hinge point of the connecting rod 7 and the valve body frame 12 forms a triangular structure, and the disc spring 63 is released; due to the action of the limiting mechanism 8, after the disc spring 63 is fully released, the crank 41 can drive the connecting rod 7 to rotate in the same direction through the disc spring cylinder 6 to ensure the opening of the valve cover 3 and improve the reliability of the product.

[0066] When the limiting mechanism 8 is not provided, the rotation of the crank 41 in the first direction will always drive the disc spring tube 6 to rotate in the second direction. When the disc spring tube 6 rotates to a certain extent, since the connecting rod 7 has two degrees of freedom, its rotation has a certain uncertainty, and it cannot be ensured that the valve cover 3 is opened.

[0067] In the embodiment of the present invention, through the cooperation of the crank 41, the disc spring tube 6, the connecting rod 7 and the limiting mechanism 8, when the valve cover 3 is opened to a certain extent, a certain force can be provided to ensure that the valve cover 3 is opened, and when the valve cover 3 is closed, a certain force can be applied to ensure that the valve cover 3 is sealed.

[0068] During the closing process of the valve cover 3, the thrust generated by the release of the disc spring cylinder 6 compressed to a certain amount can push the crank 41 to move in the direction of closing the valve cover 3. The thrust generated by the release of the disc spring cylinder 6 is the sealing pressure that seals the valve cover 3 to the valve seat 2, and the output of the sealing pressure is achieved by the disc spring 63 compressing and pushing the disc spring shaft 62, that is, the thrust output by the disc spring cylinder 6 is determined by the compression amount of the disc spring 63. Figure 8 As shown, the tail end of the cylinder 61 is provided with an adjusting nut 64 for adjusting the compression amount of the disc spring 63, and the adjusting nut 64 is sleeved on the outer circumference of the cylinder 61. When the relief valve is closed, the compression amount of the disc spring 63 is adjusted by the adjusting nut 64 to ensure that the disc spring 63 outputs a constant thrust (sealing pressure) to meet the sealing pressure requirement of the valve cover 3, thereby adjusting the relief pressure of the relief valve, and the specific relief pressure is determined according to the actual situation.

[0069] Preferably, a dust cover 65 is also provided at the rear end of the cylinder 61 to prevent dust from entering the cylinder 61 and affecting the compression and release of the disc spring 63 .

[0070] In some embodiments, Figure 3 and Figure 4 As shown, the cavity wall of the first valve cavity 11 is a hollow double-layer structure, wherein the hollow portion forms a valve body water cavity 13, and a valve body water inlet 14 and a valve body water outlet 15 communicating with the valve body water cavity 13 are provided on the cavity wall; Figures 5 to 7 As shown, the cavity wall of the second valve cavity 21 is also a hollow double-layer structure, in which the hollow part forms a valve seat water cavity 22, and a valve seat water inlet 23 and a valve seat water outlet 24 connected to the valve seat water cavity 22 are provided on the cavity wall of the second valve cavity 21; the valve cover 3 is a hollow double-layer structure, in which the hollow part forms a valve cover water cavity 31, and a valve cover water inlet and outlet 32 ​​connected to the valve cover water cavity 31 are provided on the valve cover 3.

[0071] Furthermore, the valve body water outlet 15 and the valve seat water inlet 23 are connected via a connecting water pipe 16 to communicate the valve body water cavity 13 and the valve seat water cavity 22 to achieve water circulation.

[0072] In the embodiment of the present invention, a double-layer structure is adopted to form a hollow water cavity, and cooling water is continuously introduced into the water cavity, which can take away the shell heat transmitted to the valve body 1, the valve seat 2 and the valve cover 3, and ensure that the valve cavity of the relief valve is at a safe operating temperature, so that the relief valve can withstand high temperatures, and ensure the structural strength and service life of the valve body 1, the valve seat 2 and the valve cover 3, thereby ensuring the service life of the relief valve.

[0073] Furthermore, the cavity wall of the first valve cavity 11 is provided with a temperature-resistant heat-insulating material 17; the cavity wall of the second valve cavity 21 is also provided with a temperature-resistant heat-insulating material 25, and the inner layer of the double-layer structure of the valve cover 3 is a high-temperature-resistant and corrosion-resistant stainless steel material.

[0074] The valve body 1, valve seat 2 and valve cover 3 are generally made of steel plates and other materials. Casting heat-resistant and heat-insulating materials in the valve body 1 and valve seat 2 can reduce the conduction of heat to the steel plates, so that the temperature in the valve cavity is within a certain range. Since the valve cover 3 moves with the driving mechanism 5, in order to avoid the vibration during the movement causing the heat-resistant and heat-insulating materials to fall off, the valve cover 3 is not provided with heat-resistant and heat-insulating materials, but the inner layer is made of high-temperature and corrosion-resistant stainless steel materials, which can reduce the erosion of the valve cover 3 by the high-temperature medium.

[0075] In the embodiment of the present invention, through the combination of the hollow water cavity and the temperature-resistant and heat-insulating material, on the one hand, it is possible to prevent the relief valve from being damaged by excessive temperature, and on the other hand, it is possible to reduce heat loss, keep the temperature inside the relief valve within a certain range, and increase the service life of the relief valve.

[0076] In some embodiments, Figure 6 and Figure 7As shown, the relief valve also includes a valve cover seat 9, which is installed on the valve seat 2. The valve cover seat 9 is provided with an installation cavity for installing the valve cover 3. The valve cover 3 and the valve cover seat 9 assembled as one form a valve cover assembly, which can move under the drive of the driving mechanism 5. A sealing member is provided between the valve cover seat 9 and the valve seat 2 to seal the valve cover 3 and the valve seat 2. By sealingly installing the valve cover 3 on the valve cover seat 9, and realizing the opening or closing of the valve cover 3 through the cooperation of the valve cover seat 9 and the valve seat 2, the structure is reasonable, the processing and assembly are flexible, the sealing performance is good, and the damage of the valve cover 3 can be reduced.

[0077] Specifically, Figure 6 and 7 As shown, the outer periphery of the valve cover seat 9 extends downward to form an annular protrusion 91, and the outer periphery of the valve seat 2 is provided with a support ring 26 and a pressure cover 27 that match the valve cover seat 9 to fix the valve cover seat 9 and the valve cover 3 when they are sealed on the valve seat 2.

[0078] The seal includes an annular first seal 101 and an annular second seal 102. The first seal 101 and the second seal 102 are both sleeved on the outer periphery of the valve seat 2, and the second seal 102 is located on the outer side of the first seal 101 and is arranged at a certain distance. The first seal 101 is a metal seal, and the second seal 102 is a non-metal seal.

[0079] The valve seat 2 has a valve seat sealing surface 28 that cooperates with the first sealing member 101, and the valve seat sealing surface 28 is a spherical surface. The valve cover seat 9 has a valve cover sealing surface 92 that cooperates with the first sealing member 101, and the valve cover sealing surface 92 is a conical surface. The valve seat sealing surface 28 and the valve cover sealing surface 92 are sealed and connected with the first sealing member 101 from opposite sides to achieve the inner sealing of the valve cover seat 9 and the valve seat 2. The first sealing member 101 is a metal sealing member, and the metal hard seal on the inside can reduce the erosion of the sealing member by the high-temperature medium during the release, ensure the reliability of the seal, and extend the service life of the release valve.

[0080] The sealing pair formed by the valve seat sealing surface 28 and the valve cover sealing surface 92 also needs to have a certain hardness to ensure its service life. Therefore, the valve cover seat 9 and the valve seat 2 are made of surfacing hard alloy to improve the surface hardness of the sealing pair.

[0081] Since the valve cover 3 is installed in the installation cavity of the valve cover seat 9 and moves together with the valve cover seat 9 , the valve cover sealing surface 92 of the valve cover seat 9 can be regarded as the sealing surface of the valve cover 3 .

[0082] In addition, the valve cover 3 is connected to the cross beam 44 via a cross hinge shaft 46, the valve cover 3 can swing freely, and the sealing surface of the valve cover 3 and the valve seat 2 can be automatically aligned to ensure close fit of the sealing surface and ensure the sealing performance of the relief valve.

[0083] Preferably, the installation height of the first sealing member 101 is higher than the installation height of the second sealing member 102. The installation height refers to the height of the sealing member 91 relative to the valve seat 2 when the valve cover seat 9 is sealed and connected to the valve seat 2.

[0084] The second sealing member 102 may be a sealing member made of rubber material, such as a rubber sealing ring. Figure 7 As shown, the second seal 102 is installed in the annular space formed by the support ring 26 and the gland 27, the second seal 102 is limited in radial direction, and the annular protrusion 91 of the valve cover seat 9 cooperates with the second seal 102 downward to seal.

[0085] The valve cover 3 and the valve seat 2 adopt a metal and non-metal combined sealing structure, which can realize the double sealing performance of the relief valve, the sealing is reliable, and the sealing performance can achieve zero leakage; at the same time, the pressure in the furnace or pipeline connected to the relief valve can be guaranteed to avoid energy loss. In the embodiment of the present invention, the non-metallic seal is on the outside of the metal seal, and the sealing height of the non-metallic part is lower than the sealing height of the metal hard seal, which can ensure that the non-metallic sealing surface is away from the high-temperature medium in the pipeline and is not eroded by the high-temperature medium, thereby ensuring the service life of the non-metallic seal.

[0086] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A relief valve, characterized in that: include: A valve body, a first valve cavity is formed inside the valve body; a valve seat, which is mounted on the valve body and has a second valve cavity communicated with the first valve cavity; a valve cover, mounted on the top of the valve seat, for sealing the top opening of the second valve cavity; A transmission mechanism, comprising a crank, a rocker and a transmission main shaft, wherein the transmission main shaft is rotatably arranged on the valve body, the bending part of the crank and one end of the rocker are both rotatably connected to the transmission main shaft, and the other end of the rocker is hinged to the valve cover; a driving mechanism, which is mounted on the valve body and connected to one end of the crank, the driving mechanism being capable of driving the crank to rotate and driving the rocker to rotate through the crank, thereby driving the valve cover to move, so as to open or close the second valve chamber; The disc spring cylinder is rotatably mounted on the valve body through a connecting rod and is hinged to the other end of the crank. When the driving mechanism drives the crank to rotate, the disc spring cylinder can be driven to rotate. When the disc spring cylinder rotates, a certain disc spring force can be generated to apply a force to the valve cover to make it seal with the valve seat when the valve cover is sealed on the valve seat. The disc spring cylinder includes a cylinder body, a disc spring shaft and a disc spring. The crank comprises a first crank arm and a second crank arm arranged at a predetermined angle, the first crank arm is hinged to the driving mechanism, and the second crank arm is hinged to the disc spring cylinder; One end of the connecting rod is hinged to the valve body, and the other end of the connecting rod is hinged to the outer wall of the disc spring tube, and the crank rotates in a first direction to drive the connecting rod and the disc spring tube to rotate in a second direction opposite to the first direction; The relief valve further includes a limiting mechanism, which is installed on the valve body to limit the rotation of the disc spring cylinder; When the crank drives the disc spring tube to rotate to the first position so that the center line of the first crank arm is colinear with the center line of the disc spring tube, the disc spring tube contacts the limiting mechanism and the compression of the disc spring is maximized; when the driving mechanism drives the crank to continue to rotate in the first direction, it drives the disc spring tube to continue to rotate in the second direction around the limiting mechanism with the limiting mechanism as the rotation center. At the same time, the disc spring is released until the release amount is maximized. At this time, the crank rotates in the first direction to the second position, and the abutting portion of the disc spring shaft abuts against the end wall of the cylinder body; when the driving mechanism drives the crank to continue to rotate in the first direction, the disc spring tube does not continue to rotate with the crank, and the crank drives the connecting rod to rotate in the first direction through the disc spring tube until the crank rotates to the third position in which the valve cover is fully opened.

2. The relief valve according to claim 1, characterized in that: The transmission mechanism also includes a crossbeam frame and a connecting plate. The crossbeam frame includes a crossbeam and connecting arms arranged at both ends of the crossbeam. The crossbeam is installed above the valve cover and connected to the valve cover through a cross hinge shaft. The connecting arm is hinged to the other end of the rocker. The connecting plate is located on one side of the rocker. One end of the connecting plate is hinged to the valve cover, and the other end of the connecting plate is hinged to the valve body. The valve cover, the crossbeam, the connecting plate and the rocker form a four-bar linkage to drive the valve cover to open or close when the crank drives the rocker to rotate.

3. The relief valve according to claim 1, characterized in that: The disc spring shaft is passed through the cylinder body and one end of which extends out of the cylinder body and is connected to the other end of the crank. The disc spring is sleeved on the disc spring shaft located in the cylinder body. The disc spring shaft is provided with an abutment portion that abuts against the disc spring. When the crank rotates and drives the disc spring cylinder to rotate, the disc spring shaft can compress or release the disc spring to generate a certain disc spring force and act on the crank.

4. The relief valve according to claim 1, characterized in that: The cavity wall of the first valve cavity is a hollow double-layer structure, the hollow part of which forms a valve body water cavity, and the cavity wall is provided with a valve body water inlet and a valve body water outlet connected to the valve body water cavity; the cavity wall of the second valve cavity is a hollow double-layer structure, the hollow part of which forms a valve seat water cavity, and the cavity wall of the second valve cavity is provided with a valve seat water inlet and a valve seat water outlet connected to the valve seat water cavity; the valve cover is a hollow double-layer structure, the hollow part of which forms a valve cover water cavity, and the valve cover is provided with a valve cover water inlet and an outlet connected to the valve cover water cavity.

5. The relief valve according to claim 4, characterized in that: The cavity wall of the first valve cavity is provided with a temperature-resistant heat-insulating material, the cavity wall of the second valve cavity is provided with a temperature-resistant heat-insulating material, and the inner layer of the double-layer structure of the valve cover is a high-temperature-resistant and corrosion-resistant stainless steel material.

6. The relief valve according to claim 1, characterized in that: The relief valve also includes a valve cover seat, which is installed on the valve seat, and a sealing member is provided between the valve cover seat and the valve seat, the sealing member includes an annular first sealing member and an annular second sealing member, the second sealing member is provided on the outer side of the first sealing member, and the two are spaced apart, the first sealing member is a metal sealing member, and the second sealing member is a non-metallic sealing member.

7. The relief valve according to claim 6, characterized in that: The valve seat has a valve seat sealing surface that cooperates with the first seal, and the valve seat sealing surface is a spherical surface. The valve cover seat has a valve cover sealing surface that cooperates with the first seal, and the valve cover sealing surface is a conical surface. The valve seat sealing surface and the valve cover sealing surface are sealed and connected to the first seal from opposite sides; the installation height of the first seal is higher than the installation height of the second seal.

Images