Mechanical pressure indicating system and method based on self-resetting

Abstract

The invention discloses a mechanical pressure indicating system and method based on self-resetting. The system comprises a cylinder body, a piston rod, an air inlet channel, a guide bush and a compression nut, wherein the piston rod and the air inlet channel are arranged in the cylinder body in a mutually perpendicular mode, the guide bush is arranged between the piston rod and the cylinder body, and the compression nut is jointly arranged outside the end, where the piston rod is located, of the cylinder body and outside the guide bush. The piston rod can recover to an initial state under the action of gravity by self-weight; the air inlet channel is connected with pressure-bearing equipment; when the lower surface of the shoulder shaft of the piston rod is flush with the inner bottom of the third cavity, the gas pressure in the pressure-bearing equipment is smaller than the set precision pressure; when the piston rod moves upwards and the top extends out of the top end of the compression nut and moves to an upper limit position, the gas pressure in the pressure-bearing equipment is greater than the set precision pressure; when the piston rod is downwards reset to the lower limit position under the action of the gravity of the piston rod, the interior of the pressure-bearing equipment is restored to normal pressure, and then real-time pressure indication of the pressure-bearing equipment is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of pressure indicating devices, and more specifically, relates to a mechanical pressure indicating system and method based on self-reset. Background Art

[0002] Large manned pressure-bearing equipment is generally equipped with a delivery cylinder or other similar structure for exchanging objects with the outside world. Because this structure needs to be opened and closed frequently, the outer side of the delivery cylinder is consistent with the atmospheric pressure while it is open; while the inner side of the delivery cylinder is open, the outer side of the delivery cylinder must be in a closed state. After the inner side of the delivery cylinder is opened, the pressure inside the delivery cylinder is consistent with the pressure of the pressure-bearing equipment.

[0003] Since the delivery cylinder is directly connected to the manned pressure-bearing equipment, in order to ensure that the delivery cylinder is at normal pressure before opening and at pressure after closing, a set of system pipelines and a pressure gauge are generally provided on the delivery cylinder to realize pressure discharge and display, and another independent device is provided to indicate the pressure state of the delivery cylinder.

[0004] Although the pressure establishment and release of the delivery cylinder are operated by the corresponding valve, and the pressure state of the delivery cylinder can be monitored by observing the pressure gauge, there is a risk of misleading the operator due to the poor accuracy or visual error of the pressure gauge. For the sake of safety, a fully mechanical structured and highly safe pressure indicating device is urgently needed to monitor the pressure state of the delivery cylinder. Summary of the invention

[0005] In response to the above defects or improvement needs of the prior art, the present invention provides a mechanical pressure indicating system based on self-resetting, which realizes the display of the internal pressure state of the pressure-bearing equipment through the position of the piston rod. It has a simple structure, low cost, and is easy and quick to manufacture. It can automatically realize the complete release of pressure without complicated operation and does not rely on electronic or visual readings. Instead, it ensures the safety of operation through mechanical actions. It can solve the problem that the pressure indicating device of the prior art needs to monitor the pressure state of the delivery cylinder through observation of the pressure gauge, while the pressure gauge has poor accuracy or visual errors, and there is a problem of misleading operators and causing safety risks.

[0006] In order to achieve the above-mentioned object, one aspect of the present invention provides a self-reset mechanical pressure indicating system, comprising a cylinder, a piston rod and an air inlet passage arranged perpendicularly to each other inside the cylinder, a guide bushing arranged between the piston rod and the cylinder, and a compression nut arranged on the outside of the cylinder and the outside of the guide bushing at one end of the piston rod; wherein,

[0007] The piston rod is arranged vertically, and comprises a bottom rod body, a shoulder shaft, and an upper rod body arranged in sequence from bottom to top; the outer diameters of the bottom rod body and the upper rod body are both smaller than the outer diameter of the shoulder shaft; the center of gravity of the piston rod is located below the shoulder shaft; the cylinder body comprises a horizontal portion and a vertical portion perpendicular to each other; the air inlet passage is arranged on the central axis of the horizontal portion; the piston rod is arranged at the center of the vertical portion; the interior of the vertical portion is provided with a first cavity, a second cavity, and a third cavity interconnected from bottom to top; a sealing groove is provided at the junction of the guide bushing and the piston rod; an external sealing O-ring is provided at the junction of the piston rod and the shoulder shaft;

[0008] The air inlet passage is connected to the pressure-bearing equipment; the internal pressure state of the pressure-bearing equipment is displayed through the position of the piston rod; when the lower surface of the shoulder shaft of the piston rod is flush with the bottom of the third cavity, it indicates that the internal gas pressure of the pressure-bearing equipment is less than the set precision pressure; after the pressurized gas is injected into the air inlet passage through the pressure-bearing equipment, the piston rod moves upward, thereby causing the outer sealing O-ring to move upward and embed into the sealing groove to form an end face seal with the guide bushing and the channel between the piston rod; when the top of the piston rod extends out of the top of the clamping nut and runs to the upper limit position, it indicates that the internal gas pressure of the pressure-bearing equipment is greater than the set precision pressure; when the piston rod is reset to the lower limit position under the action of its own gravity, it indicates that the internal pressure of the pressure-bearing equipment has returned to normal pressure.

[0009] Furthermore, an inner sealing O-ring is provided between the guide bushing and the inner wall of the cylinder body.

[0010] Furthermore, the diameter of the first cavity is larger than the outer diameter of the bottom rod, so that an empty space is formed between the bottom rod and the inside of the first cavity. After the pressurized gas enters the empty space, an upward thrust is generated on the bottom rod, causing the piston rod to move upward.

[0011] A clearance fit is formed between the second cavity and the bottom rod body, and between the guide bushing and the upper rod body, respectively, and the outer surfaces of the bottom rod body and the upper rod body are coated with grease;

[0012] The diameter of the third cavity is greater than the outer diameter of the shoulder shaft, and the axial displacement between the piston rod and the clamping nut is limited by the shoulder shaft;

[0013] The third cavity is communicated with the air inlet passage.

[0014] Furthermore, when the piston rod is located at the lower limit position under the action of gravity, the lower surface of the shoulder shaft is flush with the inner bottom of the third cavity;

[0015] The top end of the piston rod is flush with the top of the guided bushing.

[0016] Further, the piston rod is arranged at the center of the guide bushing;

[0017] The guide bushing comprises a bottom sleeve body, a middle sleeve body and a top sleeve body which are arranged in sequence from bottom to top and through which the piston rod passes;

[0018] The bottom sleeve is adapted to the outer diameter of the third cavity;

[0019] The outer diameters of the bottom casing and the top casing are both smaller than the outer diameter of the middle casing;

[0020] The middle sleeve is arranged on the top end surface of the vertical portion.

[0021] Furthermore, an installation groove is provided on the outer wall of the bottom sleeve body intersecting with the middle sleeve body; and the inner sealing ring is arranged in the installation groove.

[0022] Furthermore, the bottom of the clamping nut is matched with the outer diameter of the top of the vertical portion, a gap is formed between the middle portion and the outer wall of the intermediate sleeve, and the top portion is matched with the top sleeve.

[0023] Furthermore, a sealing ring is provided between the clamping nut and the vertical portion.

[0024] Furthermore, an end face sealing ring and a radial sealing ring are also provided on the horizontal portion.

[0025] A second aspect of the present invention provides a self-resetting mechanical pressure indication method, which is implemented by applying the self-resetting mechanical pressure indication system, and includes the following steps:

[0026] S1: Connect the pressure-bearing equipment to the horizontal part of the cylinder on the self-resetting mechanical pressure indicating system;

[0027] S2: Keep the piston rod in a vertical state and observe the movement position of the piston rod; when the lower surface of the shoulder shaft of the piston rod is flush with the bottom of the third cavity, it means that the gas pressure inside the pressure-bearing equipment is less than the set accuracy pressure;

[0028] S3: When the piston rod is pushed upward, the top extends out of the top of the compression nut and runs to the upper limit position, indicating that the gas pressure inside the pressure-bearing equipment is greater than the set accuracy pressure;

[0029] S4: When the piston rod returns to the lower limit position under the action of its own gravity, it indicates that the pressure inside the pressure-bearing equipment has returned to normal pressure, realizing real-time pressure indication of the pressure-bearing equipment.

[0030] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0031] (1) A mechanical pressure indicating system based on self-reset of the present invention comprises a piston rod and an air inlet passage arranged perpendicularly to each other inside a cylinder body, a guide bushing arranged between the piston rod and the cylinder body, and a clamping nut arranged on the outside of the cylinder body and the outside of the guide bushing at one end of the piston rod; a shoulder shaft for limiting the extreme position of the piston rod is arranged on the piston rod, and the center of gravity of the piston rod is arranged below the shoulder shaft, so that the piston rod can automatically return to the initial position by its own gravity when no external force is applied. This design simplifies the operation process and reduces human intervention; the piston rod can realize mechanical pressure jump and normal pressure self-reset; when the lower surface of the shoulder shaft of the piston rod is flush with the bottom of the third cavity, it indicates that the internal gas pressure of the pressure-bearing equipment is less than the set precision pressure; when the piston rod is under When the upward thrust is applied, the top extends out of the top of the locking nut and runs to the upper limit position, it indicates that the internal gas pressure of the pressure equipment is greater than the set precision pressure; when the piston rod is reset downward to the lower limit position under the action of its own gravity, it indicates that the internal pressure of the pressure equipment has returned to normal pressure; the internal pressure state of the pressure equipment is intuitively displayed by the position change of the piston rod; according to the position change of the top of the piston rod extending out of the cylinder body, an intuitive pressure indication is provided to the operator without relying on an electronic display screen or a pressure gauge; it can solve the problem that the pressure indicating device in the prior art needs to monitor the pressure state of the delivery cylinder through observation of the pressure gauge, while the pressure gauge has poor accuracy or visual errors, and there is a problem of misleading the operator and causing safety risks.

[0032] (2) A self-resetting mechanical pressure indicating system of the present invention is provided with a sealing groove at the junction of the guide bushing and the piston rod; an inner sealing O-ring is provided between the guide bushing and the inner wall of the cylinder body; an outer sealing O-ring is provided at the junction of the piston rod and the shoulder shaft; when the lower surface of the shoulder shaft of the piston rod is flush with the inner bottom of the third cavity, it indicates that the internal gas pressure of the pressure-bearing device is less than the set precision pressure; after the pressurized gas is injected into the air inlet channel through the pressure-bearing device, the piston rod moves upward, thereby causing the outer sealing ring to move upward and embed into the sealing groove to form an end face seal with the channel between the guide bushing and the piston rod; through the joint design of the sealing groove, the inner O-ring and the outer O-ring, the sealing performance between the piston rod and the cylinder body of the self-resetting mechanical pressure indicating system is ensured, gas leakage is prevented, and the safety and reliability of the self-resetting mechanical pressure indicating system in a high pressure environment are improved.

[0033] (3) The self-resetting mechanical pressure indicating system of the present invention can adapt to different pressure-bearing equipment. As long as it is connected to the pressure-bearing equipment through the air inlet channel, the pressure of the pressure-bearing equipment can be monitored. The operation is simple, intuitive and safe, and it is easy to maintain and repair. It does not require electricity supply and can reduce the risks caused by electronic equipment failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a structural schematic diagram of a self-resetting mechanical pressure indicating system according to an embodiment of the present invention when the piston rod is located at the lower limit position;

[0035] Figure 2 This is a structural schematic diagram of a self-resetting mechanical pressure indicating system according to an embodiment of the present invention when the piston rod is located at the upper limit position;

[0036] Figure 3 The present invention is a flowchart of a self-resetting mechanical pressure indicating method according to an embodiment of the present invention.

[0037] In all the drawings, the same figure marks represent the same technical features, specifically: 1-piston rod, 11-bottom rod body, 12-shoulder shaft, 13-upper rod body, 2-guide bushing, 20-sealing groove, 21-bottom sleeve, 211-mounting groove, 22-middle sleeve, 23-top sleeve, 3-inner sealing O-type sealing ring, 4-tension nut, 5-outer sealing O-type sealing ring, 6-intake channel, 7-cylinder body, 71-horizontal part, 72-vertical part, 721-first cavity, 722-second cavity, 723-third cavity, 8-end face sealing ring, 9-radial sealing ring. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, when an element is referred to as being "fixed to", "disposed on" or "provided on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element; the terms "installed", "connected", "connected" and "provided with" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal connection of the two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0040] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0041] like Figure 1 and Figure 2As shown, one aspect of the present invention provides a mechanical pressure indicating system based on self-reset, comprising a cylinder body 7, a piston rod 1 and an air inlet passage 6 arranged perpendicularly to each other inside the cylinder body 7, a guide bushing 2 arranged between the piston rod 1 and the cylinder body 7, and a clamping nut 4 arranged together on the outside of the cylinder body 7 and the outside of the guide bushing 2 at one end where the piston rod 1 is located; the guide bushing 2 is flush with the top of the clamping nut 4; there are gap seals between the cylinder body 7 and the piston rod 1, and between the cylinder body 7 and the guide bushing 2; the piston rod 1 is arranged vertically, including a bottom rod body 11, a shoulder shaft 12, and an upper rod body 13 arranged in sequence from bottom to top; the outer diameters of the bottom rod body 11 and the upper rod body 13 are both smaller than the outer diameters of the shoulder shaft 12. The outer diameter of the shoulder shaft 12 and the outer walls of the bottom rod body 11 and the upper rod body 13 are all stepped; the cylinder body 7 includes a horizontal portion 71 and a vertical portion 72 that are perpendicular to each other; the air inlet channel 6 is arranged on the central axis of the horizontal portion 71; the piston rod 1 is arranged at the center of the vertical portion 72; the directness and efficiency of gas flow are ensured by vertically arranging the air inlet channel 6 and the piston rod 1, and the interface with other systems is also simplified; the cylinder body 7 is L-shaped, and the vertical portion 72 is provided with a first cavity 721, a second cavity 722, and a third cavity 723 that are interconnected from bottom to top; the third cavity 723 is used to accommodate the upper rod body 13; a sealing groove 20 is provided at the junction of the guide bushing 2 and the piston rod 1 ; The center of gravity of the piston rod 1 is located below the shoulder shaft 12, which can ensure that the piston rod 1 can restore its initial state by its own weight under the action of gravity; an inner sealing O-ring 3 is provided between the guide bushing 2 and the inner wall of the cylinder body 7, which is used to seal the channel between the guide bushing 2 and the cylinder body 7, thereby realizing the channel sealing between the piston rod 1 and the clamping nut 4; an outer sealing O-ring 5 is provided at the junction of the piston rod 1 and the shoulder shaft 12; the air intake channel 6 is connected to the pressure-bearing equipment; after the pressurized gas is injected into the air intake channel 6 through the pressure-bearing equipment, the piston rod 1 moves upward, thereby causing the outer sealing O-ring 5 to move upward and embed into the sealing groove 20; as the pressure increases, the outer sealing O-ring The greater the sealing compression of the sealing ring 5 in the sealing groove 20, the greater the sealing performance of the indicating system is. When the piston rod 1 is in the upper limit position, the top of the piston rod 1 extends out of the cylinder body 7, and the inner sealing O-ring 3 is located in the sealing groove 20 of the guide bushing 2 to ensure that the cylinder body 7 does not lose pressure. The present invention realizes the display of the internal pressure state of the pressure-bearing equipment through the position of the piston rod 1. When the lower surface of the shoulder 12 of the piston rod 1 is flush with the bottom of the third cavity 723, it indicates that the internal gas pressure of the pressure-bearing equipment is less than the set precision pressure. When the piston rod 1 is subjected to an upward thrust, the top extends out of the top of the clamping nut 4 and runs to the upper limit position, it indicates that the internal gas pressure of the pressure-bearing equipment is greater than the set precision pressure.When the piston rod 1 returns to the lower limit position under the action of its own gravity, it means that the pressure inside the pressure-bearing equipment has returned to normal pressure. ;

[0042] Furthermore, if Figure 1 and Figure 2 As shown, the diameter of the third cavity 723 is larger than the outer diameter of the shoulder shaft 12, and the shoulder shaft 12 limits the axial displacement between the piston rod 1 and the clamping nut 4, thereby ensuring the movement range and sealing performance of the piston rod 1 under different pressures; the third cavity 723 is connected to the air inlet channel 6, and such a design allows the gas to apply different pressures to the piston rod 1 at different stages, thereby achieving more precise pressure control; the piston rod 1 is in the initial state when it is at the lower limit position under the action of gravity. At this time, the bottom of the shoulder shaft 12 is flush with the inner bottom of the third cavity 723; the top of the piston rod 1 is flush with the top of the guide bushing 2; so that the operator can judge the pressure of the pressure-bearing equipment by observing the position of the piston rod 1 Pressure state; after the pressurized gas is injected through the air inlet channel 6, the piston rod 1 moves upward, so that the outer sealing O-ring 5 above the shoulder shaft 12 forms an end face seal with the channel between the guide bushing 2 and the piston rod 1. The greater the pressure of the pressure-bearing equipment, the greater the sealing compression, which can greatly improve the sealing performance of the self-resetting mechanical pressure indicating system; when the internal pressure of the pressure-bearing equipment is released, the piston rod 1 resets downward to the lower limit position under the action of its own gravity, indicating that the internal pressure of the pressure-bearing equipment has returned to normal pressure; this self-resetting function simplifies the operating process and reduces human intervention; the present invention realizes pressure monitoring and indication through a mechanical structure, reduces dependence on electronic equipment, and improves stability in harsh environments.

[0043] Furthermore, if Figure 1 and Figure 2 As shown, the diameter of the first cavity 721 is larger than the outer diameter of the bottom rod 11, so that an empty space is formed between the bottom rod 11 and the inside of the first cavity 721. After the pressurized gas enters the empty space, an upward thrust is generated on the bottom rod 11, causing the piston rod 1 to move upward; a clearance fit is formed between the second cavity 722 and the bottom rod 11, and between the guide bushing 2 and the upper rod 13, respectively. The outer surfaces of the bottom rod 11 and the upper rod 13 are coated with grease, which can minimize the friction between the piston rod 1 and the cylinder body 7; it helps to reduce the energy consumption of the system and improve the response speed and life of the system; the smaller friction makes the piston rod 1 more sensitive to pressure changes and can indicate the pressure state inside the pressure-bearing equipment more quickly; the clearance fit design simplifies maintenance work because it reduces wear, thereby reducing the frequency and complexity of maintenance.

[0044] Furthermore, if Figure 1 and Figure 2As shown, the piston rod 1 is arranged at the center of the guide bushing 2; the guide bushing 2 includes a bottom sleeve 21, a middle sleeve 22, and a top sleeve 23 arranged in sequence from bottom to top for the piston rod 1 to pass through; the bottom sleeve 21, the middle sleeve 22, and the top sleeve 23 are made of one piece, which improves the overall rigidity and durability and simplifies the assembly process; a transition fit is formed between the bottom sleeve 21 and the third cavity 723; the outer diameters of the bottom sleeve 21 and the top sleeve 23 are both smaller than the outer diameter of the middle sleeve 22; the middle sleeve 22 is arranged on the top end face of the vertical portion 72; The intersecting outer walls are provided with a mounting groove 211; the inner sealing O-ring 3 is arranged in the mounting groove 211; the bottom of the clamping nut 4 is matched with the top outer diameter of the vertical portion 72, and the two are threadedly connected, a gap is formed between the middle portion and the outer wall of the middle sleeve 22, and the top is matched with the top sleeve 23; through the coordinated use of the inner sealing O-ring 3 and the outer sealing O-ring 5, efficient sealing between the piston rod 1 and the cylinder body 7 is achieved, and the sealing performance and safety of the system are improved; the piston rod 1 can automatically reset to the initial state under the action of gravity. This design simplifies the operating process, reduces human intervention, and improves the response speed and reliability of the system.

[0045] Furthermore, if Figure 1 and Figure 2 As shown, a sealing ring is provided between the clamping nut 4 and the vertical portion 72 to achieve channel sealing between the cylinder body 7 and the clamping nut 4; an end face sealing ring 8 and a radial sealing ring 9 are also provided on the horizontal portion 71; the end face sealing ring 8 is used to achieve sealing between the cylinder body 7 and the pressure-bearing equipment. This sealing method can effectively prevent gas leakage from the end face of the horizontal portion 71, ensuring the overall sealing of the system; the radial sealing ring 9 is used to achieve radial sealing between the cylinder body 7 and the pressure-bearing equipment. This sealing ring can prevent gas leakage along the radial path of the connector, further enhancing the sealing performance of the system. By combining the sealing ring between the clamping nut 4 and the vertical portion 72, the end face sealing ring 8 and the radial sealing ring 9 between the cylinder body 7 and the pressure-bearing equipment, a multi-layer sealing system is formed to improve the sealing reliability of the system and reduce the risk of leakage; thereby ensuring the safe operation of the equipment and the safe operation of the operator.

[0046] Furthermore, if Figure 1 and Figure 2As shown, the diameters of the bottom rod body 11 and the upper rod body 13 are basically the same. During actual processing, according to the weight of the piston rod 1, the diameter of the bottom rod body 11 is made slightly larger than the diameter of the upper rod body 13, and the diameter difference between the bottom rod body 11 and the upper rod body 13 is selected according to the working pressure and precision requirements of the trip valve; by increasing the diameter of the bottom rod body 11, its rigidity and strength can be increased to support the additional weight; the working pressure requirements of the self-resetting mechanical pressure indicating system determine the force that the piston rod 1 needs to withstand; under high working pressure, a larger diameter may be required to provide sufficient strength and rigidity to prevent the rod body from being deformed or damaged under pressure.

[0047] Furthermore, the piston rod 1 is preferably made of aluminum bronze, and the cylinder body 7 is made of stainless steel, so as to ensure that the friction between the piston rod 1 and the cylinder body 7 is as small as possible.

[0048] The accuracy of a self-resetting mechanical pressure indicating system of the present invention depends on the weight and diameter of the piston rod 1; generally, the smaller the weight of the piston rod 1 and the larger the diameter, the higher the accuracy; the following are two specific embodiments of the self-resetting mechanical pressure indicating system when the working pressure is 3MPa and the diameters of the bottom rod body 11 and the upper rod body 13 of the piston rod 1 are the same:

[0049] Embodiment 1:

[0050] The piston rod 1 is made of aluminum bronze, weighs 0.5Kg, and has a diameter of 15mm. According to actual tests, when the pressure-bearing device connected to the air inlet channel 6 of the self-resetting mechanical pressure indicating system is pressurized, the air pressure enters the air inlet channel 6 and is pressurized to more than 0.03MPa. The piston rod 1 of the self-resetting mechanical pressure indicating system will automatically move to the upper limit position; when the internal pressure of the air inlet channel 6 is reduced to less than 0.03MPa, the piston rod 1 will return to the lower limit position under the action of its own gravity; the accuracy of the self-resetting mechanical pressure indicating system in this example is 0.03MPa;

[0051] Embodiment 2:

[0052] The piston rod 1 is made of aluminum alloy, weighs 0.17Kg, has a diameter of 15mm, and the accuracy of the self-resetting mechanical pressure indicating system is 0.01MPa. According to actual experiments, when the pressure-bearing equipment connected to the air inlet channel 6 of the self-resetting mechanical pressure indicating system is pressurized, the air pressure enters the air inlet channel 6 and is pressurized to above 0.01MPa, the piston rod 1 of the self-resetting mechanical pressure indicating system will move to the upper limit position; when the internal pressure of the air inlet channel 6 is reduced to less than 0.01MPa, the piston rod 1 of the self-resetting mechanical pressure indicating system will return to the lower limit position under the action of its own gravity. In this example, the accuracy of the self-resetting mechanical pressure indicating system is 0.01MPa.

[0053] like Figure 3 As shown, the second aspect of the present invention provides a self-resetting mechanical pressure indication method, which is implemented by the self-resetting mechanical pressure indication system, and includes the following steps:

[0054] S1: Connect the pressure-bearing equipment to the horizontal part 71 of the cylinder 7 on the self-resetting mechanical pressure indicating system; realize the sealing between the cylinder 7 and the pressure-bearing equipment through the end face sealing ring 8 and the radial sealing ring 9 on the horizontal part 71 to prevent pressure release;

[0055] S2: Keep the piston rod 1 in a vertical state and observe the movement position of the piston rod 1; when the lower surface of the shoulder shaft 12 of the piston rod 1 is flush with the inner bottom of the third cavity 723, it indicates that the gas pressure inside the pressure-bearing equipment is less than the set accuracy pressure;

[0056] S3: After the pressurized gas is injected into the air inlet channel 6 through the pressure-bearing device, the piston rod 1 moves upward under the thrust, so that the outer sealing O-ring 5 moves upward and is embedded in the sealing groove 20. When the top of the piston rod 1 extends out of the top of the clamping nut 4 and runs to the upper limit position, it indicates that the gas pressure inside the pressure-bearing device is greater than the set precision pressure;

[0057] S4: When the piston rod 1 is reset downward to the lower limit position under the action of its own gravity, it indicates that the pressure inside the pressure-bearing equipment has returned to normal pressure, realizing real-time pressure indication of the pressure-bearing equipment.

[0058] The self-resetting mechanical pressure indicating system of the present invention needs to be in a closed state when the pressure-bearing equipment builds up pressure to avoid pressure drop; when the pressure-bearing equipment becomes at normal pressure, it automatically changes to a normally open state. The piston rod 1 of the present invention needs to be installed vertically upward. The air inlet channel 6 of the self-resetting mechanical pressure indicating system of the present invention is connected to the pressure-bearing equipment, and the pressure state inside the pressure-bearing equipment is displayed by the position of the piston rod 1. When the pressure-bearing equipment is at normal pressure, the upper surface of the shoulder shaft 12 of the piston rod 1 is flush with the inner bottom of the third cavity 723, and this state shows that the gas pressure inside the pressure-bearing equipment is less than the set precision pressure; when the pressure inside the pressure-bearing equipment enters the first cavity 721 where the piston rod 1 of the self-resetting mechanical pressure indicating system is located through the air inlet channel 6, the pressure of the pressure-bearing equipment can establish an upward thrust on the piston rod 1. When the thrust value is greater than the gravity of the piston rod 1 and the tiny friction force, the top of the piston rod 1 extends out of the top of the clamping nut 4 and runs to the upper limit position, thereby showing that the gas pressure inside the pressure-bearing equipment is greater than the set precision pressure; when the pressure of the pressure-bearing equipment drops to normal pressure, the piston rod 1 resets downward to the lower limit position under the action of its own gravity, and this state shows that the inside of the pressure-bearing equipment has returned to normal pressure. The present invention realizes the display of the internal pressure state of the pressure-bearing equipment through the position of the piston rod, has a simple structure, low cost, is easy and quick to manufacture, can automatically realize the complete release of pressure, does not require complicated operation, does not rely on electronic or visual readings, but ensures the safety of operation through mechanical action; it can solve the problem that the pressure indicating device of the prior art needs to monitor the pressure state of the delivery cylinder through observation of the pressure gauge, and the pressure gauge has poor accuracy or visual errors, which may mislead the operator and cause safety risks.

[0059] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A mechanical pressure indicating system based on self-reset, characterized in that: The invention comprises a cylinder body (7), a piston rod (1) and an air inlet passage (6) arranged perpendicularly to each other inside the cylinder body (7), a guide bushing (2) arranged between the piston rod (1) and the cylinder body (7), and a clamping nut (4) arranged on the outside of the cylinder body (7) and the outside of the guide bushing (2) at one end where the piston rod (1) is located; wherein: The piston rod (1) is arranged vertically, and comprises a bottom rod body (11), a shoulder shaft (12), and an upper rod body (13) which are arranged in sequence from bottom to top; the outer diameters of the bottom rod body (11) and the upper rod body (13) are both smaller than the outer diameter of the shoulder shaft (12); the center of gravity of the piston rod (1) is located below the shoulder shaft (12); the cylinder body (7) comprises a horizontal portion (71) and a vertical portion (72) which are perpendicular to each other; the air inlet passage (6) is arranged at the bottom of the water cylinder; The piston rod (1) is arranged at the center of the vertical portion (72); the vertical portion (72) is provided with a first cavity (721), a second cavity (722), and a third cavity (723) which are interconnected from bottom to top; a sealing groove (20) is provided at the junction of the guide bushing (2) and the piston rod (1); an external sealing O-ring (5) is provided at the junction of the piston rod (1) and the shoulder shaft (12); The air inlet passage (6) is connected to the pressure-bearing device; the internal pressure state of the pressure-bearing device is displayed by the position of the piston rod (1); when the upper surface of the shoulder shaft (12) of the piston rod (1) is flush with the inner bottom of the third cavity (723), it indicates that the internal gas pressure of the pressure-bearing device is less than the set precision pressure; when the piston rod (1) moves upward, the top extends out of the top of the clamping nut (4) and runs to the upper limit position, it indicates that the internal gas pressure of the pressure-bearing device is greater than the set precision pressure; when the piston rod (1) is reset to the lower limit position under the action of its own gravity, it indicates that the internal pressure of the pressure-bearing device has returned to normal pressure, thereby realizing real-time pressure indication of the pressure-bearing device.

2. A self-resetting mechanical pressure indicating system according to claim 1, characterized in that: An inner sealing O-ring (3) is provided between the guide bushing (2) and the inner wall of the cylinder body (7).

3. A self-resetting mechanical pressure indicating system according to claim 2, characterized in that: The diameter of the first cavity (721) is greater than the outer diameter of the bottom rod (11), so that an empty space is formed between the bottom rod (11) and the inside of the first cavity (721). After the pressurized gas enters the empty space, an upward thrust is generated on the bottom rod (11), causing the piston rod (1) to move upward; A clearance fit is formed between the second cavity (722) and the bottom rod (11), and between the guide bushing (2) and the upper rod (13), and the outer surfaces of the bottom rod (11) and the upper rod (13) are coated with grease; The diameter of the third cavity (723) is greater than the outer diameter of the shoulder shaft (12), and the axial displacement between the piston rod (1) and the clamping nut (4) is limited by the shoulder shaft (12); The third cavity (723) is in communication with the air inlet passage (6).

4. A self-resetting mechanical pressure indicating system according to any one of claims 1 to 3, characterized in that: When the piston rod (1) is located at the lower limit position under the action of gravity, the lower surface of the shoulder shaft (12) is flush with the inner bottom of the third cavity (723); The top end of the piston rod (1) is flush with the top end of the guide bushing (2).

5. A self-resetting mechanical pressure indicating system according to claim 2 or 3, characterized in that: The piston rod (1) is arranged at the center of the guide bushing (2); The guide bushing (2) comprises a bottom sleeve body (21), a middle sleeve body (22), and a top sleeve body (23) which are arranged in sequence from bottom to top and through which the piston rod (1) passes; A transition fit is formed between the bottom sleeve (21) and the third cavity (723); The outer diameters of the bottom casing (21) and the top casing (23) are both smaller than the outer diameter of the middle casing (22); The middle sleeve (22) is arranged on the top end surface of the vertical portion (72).

6. A self-resetting mechanical pressure indicating system according to claim 5, characterized in that: An outer wall of the bottom casing (21) intersecting with the middle casing (22) is provided with a mounting groove (211); the inner sealing O-ring (3) is arranged in the mounting groove (211).

7. A self-resetting mechanical pressure indicating system according to claim 5, characterized in that: The bottom of the clamping nut (4) is matched with the outer diameter of the top of the vertical portion (72), a gap is formed between the middle portion and the outer wall of the middle sleeve (22), and the top portion is matched with the top sleeve (23).

8. A self-resetting mechanical pressure indicating system according to any one of claims 1-3, 6 and 7, characterized in that: A sealing ring is provided between the compression nut (4) and the vertical portion (72).

9. A self-resetting mechanical pressure indicating system according to any one of claims 1-3, 6 and 7, characterized in that: The horizontal portion (71) is also provided with an end face sealing ring (8) and a radial sealing ring (9).

10. A mechanical pressure indication system based on self-reset, characterized in that: A method for implementing a self-resetting mechanical pressure indication method as claimed in any one of claims 1 to 9, comprising: S1: connecting the pressure-bearing equipment to the horizontal portion (71) of the cylinder (7) on the self-resetting mechanical pressure indicating system; S2: Keep the piston rod (1) in a vertical position and observe the movement position of the piston rod (1); when the lower surface of the shoulder shaft (12) of the piston rod (1) is flush with the bottom of the third cavity (723), it indicates that the gas pressure inside the pressure-bearing device is less than the set accuracy pressure; S3: When the piston rod (1) is pushed upward, the top portion extends out of the top end of the clamping nut (4) and moves to the upper limit position, indicating that the gas pressure inside the pressure-bearing equipment is greater than the set accuracy pressure; S4: When the piston rod (1) is reset downward to the lower limit position under the action of its own weight, it indicates that the pressure inside the pressure-bearing device has returned to normal pressure, thereby achieving real-time pressure indication of the pressure-bearing device.

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