A pressure-adjustable relief valve

Abstract

The present invention belongs to the technical field of hydraulic relief valve equipment, and relates to a pressure-adjustable relief valve, comprising an inlet, a valve core, a three-claw magnet fixing ring, a lower magnet, a return spring, a three-claw reverse thrust fixing ring, a shell and an annular limiting nut; the inlet at the front of the shell is connected to the valve core in a slot-type manner, the valve core is sleeved with a lower magnet, a three-claw magnet fixing ring is arranged on one side of the lower magnet, the valve core passes through the three-claw magnet fixing ring, an upper magnet is arranged in the three-claw magnet fixing ring, the rear of the valve core passes through the three-claw reverse thrust fixing ring, a return spring is arranged on the front side of the three-claw reverse thrust fixing ring, the return spring provides rebound force for the valve core, and the rear end of the valve core is threadedly connected to the annular limiting nut; the device realizes precise control of the relief valve safety pressure and the minimum valve discharge pressure difference, thereby achieving the goal of fully relieving the pressure of a large-volume container, and avoiding the safety hazards of insufficient pressure relief and excessive pressure.

Description

Technical field:

[0001] The present invention belongs to the technical field of hydraulic relief valve equipment, and particularly relates to a high-pass and low-close relief valve which uses magnetic force and spring force to realize opening under high pressure and closing under low pressure, and particularly to a relief valve with adjustable pass and close pressure. Background technology:

[0002] The overflow valve is a key safety guarantee to ensure that the fluid pressure in pipelines and containers is within a reasonable range. The overflow valve generally sets the safety pressure through spring force or electromagnetic force. When the fluid pressure in the pipeline or pressure vessel is greater than the spring force or electromagnetic force under the safety pressure, the valve opens. When the fluid overflows and the pressure drops below the safety pressure, the valve quickly closes, thereby ensuring the stability and safety of the pressure.

[0003] In the existing patent technology, the Chinese patent with publication number CN110984885A discloses an electromagnetic spring controlled pilot relief valve, including a hexagonal plug, a pilot valve front cavity, a pilot valve body, a damping flow channel, a main valve upper cavity flow channel, a pilot valve rear cavity, a pilot valve core, a permanent magnet I, a permanent magnet II, a magnetic sleeve, an electromagnetic coil, magnetic lines of force, an end cover, a magnetic screw, a coil frame, an oil return flow channel, a damper, an oil inlet flow channel, a main valve body, a hexagonal plug, a main valve sleeve, a main valve core, and a permanent magnet ring; the pilot valve of the invention adopts an electromagnetic spring to transmit force through a magnetic field, and the main valve adopts a gravitational permanent magnet spring to reset. The Chinese patent with publication number CN212690489U discloses an ultra-high pressure three-way proportional pressure reducing valve with electromagnetic isolation, including a pressure reducing valve body, a pressure reducing valve core, a pressure reducing spring, an end cover, a cone valve spring, a cone valve core, an electromechanical converter and a control valve; the ultra-high pressure three-way proportional pressure reducing valve changes the technical solution of directly comparing the outlet oil pressure force on the entire pressure-bearing surface of the valve core adopted by the traditional pressure reducing valve with the compression spring or the electromagnetic actuator, to a technical solution of comparing the outlet oil pressure force on the pressure-bearing surface of part of the valve core with the oil pressure force adjusted by the cone valve on the entire pressure-bearing surface of the valve core.

[0004] However, for some large-volume high-pressure containers containing highly compressible fluids, the instantaneous pressure relief of conventional relief valves will only produce a local decrease in the pressure around the valve, and the fluid pressure away from the valve will still be in a dangerous state higher than the safety pressure. In addition, when the valve is opened, the highly compressible fluid will produce high-speed instantaneous flow, resulting in water hammer pressure higher than the safety pressure when the valve is closed. This pressure will propagate to various parts of the container in the form of elastic waves, creating secondary pressure safety hazards. Containers and pipelines of different specifications require different pressures to open and close valves. Conventional relief valves cannot accurately adjust the pressure value of the valve opening according to specific application scenarios; therefore, it is necessary to design a valve that can overflow and relieve pressure for a long time and is adjustable to ensure the pressure safety of large-volume containers with highly compressible fluids, a wider range of hydraulic opening and closing, and improve the adaptability and versatility of applications. Summary of the invention:

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art. In view of the shortcomings of the existing conventional relief valves, such as short pressure relief time and uncontrollable discharge flow, as well as potential pressure safety hazards when used in large-volume containers with highly compressible fluids, a pressure-adjustable relief valve is designed by utilizing the different characteristics of magnetic attraction and spring elastic force changing with displacement.

[0006] In order to achieve the above-mentioned purpose, the present invention relates to a pressure-adjustable relief valve, whose main structure includes an inlet, a valve core, a three-claw magnet fixing ring, an upper magnet, a lower magnet, a return spring, a three-claw reverse thrust fixing ring, a shell and an annular limit nut; an inlet is arranged in the front part of the shell, and the inlet is tightly connected with the valve core in a slot-type manner, and the valve core can enter or be pulled out from the inlet, and a lower magnet is fixedly sleeved on the valve core, and a three-claw magnet fixing ring is arranged on one side of the lower magnet, and the valve core passes through the three-claw magnet fixing ring, and the three-claw magnet fixing ring is fixedly connected to the shell as a whole, and a three-claw magnet fixing ring and the shell are opened between the three-claw magnet fixing ring and the shell. There is a fluid channel; a circular upper magnet is installed in the three-claw magnet fixing ring, the contact surfaces of the upper magnet and the lower magnet have opposite polarities and there is magnetic attraction; the rear of the valve core passes through the three-claw reverse thrust fixing ring, the three-claw reverse thrust fixing ring is fixedly connected to the shell as a whole, and a fluid channel is opened between the three-claw reverse thrust fixing ring and the shell; a return spring is arranged on the front side of the three-claw reverse thrust fixing ring, the front end of the return spring is connected to the retaining ring, the retaining ring is fixed on the valve core, the three-claw reverse thrust fixing ring and the retaining ring are used to fix the return spring and provide spring reverse thrust; the rear end of the valve core is threadedly connected to the annular limit nut, and an outlet is opened at the rear of the shell.

[0007] The present invention discloses a pressure-adjustable relief valve, wherein the outer shell is a tubular structure, an inlet is arranged in the front of the outer shell, the inlet is composed of a front upper conical tube cavity and a rear cylindrical smooth tube cavity, the conical tube cavity is used to generate a fluid with a certain flow rate, the smooth tube cavity is in contact with the valve core slot-type gap, the contact gap is less than 0.02mm, the maximum length of the valve core that can be extended into the smooth tube cavity is 10cm, when the valve core is in contact with the smooth tube cavity in the inlet, the valve is closed; when the valve core is separated from the smooth tube cavity in the inlet, the valve is opened; a sealing ring is fixedly sleeved on the outside of the valve core, and the sealing ring is used to provide a gap seal between the smooth tube cavity and the valve core.

[0008] The valve core upper fixing sleeve of the present invention is provided with an annular lower magnet, and three protrusions are evenly distributed on the outer side of a three-claw magnet fixing ring arranged on one side of the lower magnet, and the three protrusions of the three-claw magnet fixing ring are respectively fixedly connected to the outer shell through fixing screws as a whole, and three fluid channels are formed between the three protrusions of the three-claw magnet fixing ring and the outer shell; an annular upper magnet is installed in the three-claw magnet fixing ring, and the upper magnet and the lower magnet are composed of permanent magnets and exist in pairs, and the magnetic attraction force of a pair of upper magnets in close contact with the lower magnet can provide the valve core with a fluid holding pressure of 20MPa-40MPa; according to the specific application scenario and the required fluid holding pressure, the combination of the lower magnet installed on the valve core and the upper magnet installed on the three-claw magnet fixing ring can be installed in 1-10 pairs, thereby realizing the setting of the valve safety overflow pressure within the range of 20MPa-400MPa.

[0009] The three-claw reverse thrust fixing ring of the present invention is evenly distributed with three protrusions on the outer side, the three protrusions of the three-claw reverse thrust fixing ring are fixedly connected to the outer shell through fixing screws, and three fluid channels are formed between the three protrusions of the three-claw reverse thrust fixing ring and the outer shell.

[0010] The rear end of the valve core described in the present invention is threadedly connected to the annular limit nut by a fine thread with a pitch of 0.5mm-1mm. By adjusting the annular limit nut, the minimum spacing between the upper magnet and the lower magnet can be controlled to vary between 0mm-40mm, thereby finely adjusting the valve safety overflow pressure with an accuracy of 0.1MPa-0.2MPa and a maximum range of 40MPa; when the valve is opened, the valve core displaces 10cm, and the distance between the upper magnet and the lower magnet synchronously increases by 10cm. At this time, the magnetic attraction force between the upper magnet and the lower magnet decreases sharply and is less than the spring force; the return spring is used to provide a return thrust for the valve core after the valve is opened. By adjusting the elastic force of the return spring, the valve pressure difference when the valve core returns can be controlled to vary between 0.2MPa-10MPa.

[0011] The specific steps of the open-close pressure adjustable relief valve of the present invention to realize the valve opening under high pressure and the valve closing under low pressure are:

[0012] (1) By rotating and adjusting the connection position between the annular limit nut and the rear end of the valve core, the minimum distance between the upper magnet and the lower magnet is controlled, and then the safety overflow pressure is adjusted. The open-close pressure adjustable overflow valve is installed on a large volume container containing a highly compressible fluid using a threaded structure or a flange structure;

[0013] (2) When the pressure of the large volume container exceeds the set safety overflow pressure, the valve core is pushed out from the inlet under the fluid pressure, and the open and close pressure adjustable overflow valve is in the open state;

[0014] (3) After the pressure-adjustable relief valve is opened, there is a pressure difference before and after the fluid passes through the pressure-adjustable relief valve. Under this pressure difference, the fluid impact force is greater than the return spring force, and the pressure-adjustable relief valve begins to continuously release pressure;

[0015] (4) After the pressure-adjustable relief valve continues to release pressure for a period of time, the pressure difference before and after the pressure-adjustable relief valve decreases, the fluid impact force is smaller than the return spring force, and the valve core returns to its original position under the return spring force.

[0016] Compared with the prior art, the main body structure of the open and close pressure adjustable relief valve designed in the present invention is reasonable, and a relief valve is designed by utilizing the magnetic attraction between permanent magnets and the elastic force of a spring, which opens to relieve pressure at high pressure and closes to stabilize pressure at low pressure, thereby achieving precise control of the relief valve safety pressure and the minimum valve discharge pressure difference, thereby achieving the goal of fully relieving the pressure of a large-volume container containing a highly compressible fluid, and avoiding the safety hazards of insufficient pressure relief and excessive pressure. Description of the drawings:

[0017] Figure 1 The present invention is a schematic diagram of the structural principle of the open and close pressure adjustable overflow valve.

[0018] Figure 2 The present invention is a schematic diagram of the structural principle of a three-claw magnet fixing ring.

[0019] Figure 3 It is a schematic diagram of the structural principle of the lower magnet involved in the present invention.

[0020] Figure 4 The present invention is a schematic diagram of the structural principle of a three-claw reverse thrust fixing ring. Specific implementation method:

[0021] The present invention will be further described below by way of embodiments in conjunction with the accompanying drawings.

[0022] Example:

[0023] This embodiment relates to a pressure-adjustable relief valve, such as Figure 1As shown, its main structure includes an inlet 1, a sealing ring 2, a valve core 3, a three-claw magnet fixing ring 4, an upper magnet 5, a lower magnet 6, a return spring 7, a fixing screw 8, a three-claw reverse thrust fixing ring 9, a shell 10, and an annular limit nut 11; an inlet 1 is arranged in the front part of the shell 10 of the tubular structure, and the inlet 1 is composed of a front upper conical tube cavity and a rear cylindrical smooth tube cavity. The conical tube cavity is used to generate a fluid with a certain flow rate. The smooth tube cavity is in contact with the valve core 3 in a slot-like gap, and the contact gap is less than 0.02mm. The maximum length that the valve core 3 can extend into the smooth tube cavity is about 10cm. When the valve core 3 contacts the smooth tube cavity in the inlet 1, the valve is closed; when the valve core 3 is separated from the smooth tube cavity in the inlet 1, the valve is opened; the sealing ring 2 is fixedly sleeved on the outside of the valve core 3, and the sealing ring 2 is used to provide a gap seal between the smooth tube cavity and the valve core 3; as shown Figure 1 , 3 As shown, a circular lower magnet 6 is fixedly mounted on the valve core 3, and a three-claw magnet fixing ring 4 is arranged on one side of the lower magnet 6. The valve core 3 passes through the three-claw magnet fixing ring 4. Figure 2 As shown, three protrusions are evenly distributed on the outer side of the three-claw magnet fixing ring 4, and the three protrusions of the three-claw magnet fixing ring 4 are fixedly connected to the outer shell 10 through fixing screws 8, and three fluid channels are formed between the three protrusions of the three-claw magnet fixing ring 4 and the outer shell 10; a circular ring-shaped upper magnet 5 is installed in the three-claw magnet fixing ring 4, and the upper magnet 5 and the lower magnet 6 are composed of permanent magnets and exist in pairs, and the contact surfaces of the upper magnet 5 and the lower magnet 6 have opposite polarities and magnetic attraction. The magnetic attraction of a pair of upper magnets 5 in close contact with the lower magnet 6 can provide a fluid holding pressure of 20MPa-40MPa for the valve core 3; according to the specific application scenario and the required fluid holding pressure, the combination of the lower magnet 6 installed on the valve core 3 and the upper magnet 5 installed on the three-claw magnet fixing ring 4 can be installed in 1-10 pairs, so as to realize the setting of the valve safety overflow pressure within the range of 20MPa-400MPa; the rear part of the valve core 3 passes through the three-claw reverse thrust fixing ring 9, as shown Figure 4As shown, three protrusions are evenly distributed on the outer side of the three-claw reverse thrust fixing ring 9, and the three protrusions of the three-claw reverse thrust fixing ring 9 are fixedly connected to the housing 10 as a whole through the fixing screws 8, and three fluid channels are formed between the three protrusions of the three-claw reverse thrust fixing ring 9 and the housing 10; a return spring 7 is arranged on the front side of the three-claw reverse thrust fixing ring 9, and the front end of the return spring 7 is connected to the retaining ring 12, and the retaining ring 12 is fixed on the valve core 3, and the three-claw reverse thrust fixing ring 9 and the retaining ring 12 are used to fix the return spring 7 and provide spring reverse thrust; the rear end of the valve core 3 is connected to the annular limit screw The female 11 is threadedly connected through a fine thread with a pitch of 0.5mm-1mm. By adjusting the annular limit nut 11, the minimum distance between the upper magnet 5 and the lower magnet 6 can be controlled to change between 0mm-40mm, thereby finely adjusting the valve safety overflow pressure with an accuracy of 0.1MPa-0.2MPa and a maximum range of about 40MPa; when the valve is opened, the valve core 3 moves about 10cm, and the distance between the upper magnet 5 and the lower magnet 6 increases synchronously by about 10cm. At this time, the magnetic attraction between the upper magnet 5 and the lower magnet 6 decreases sharply and is less than the spring force. The return spring 7 is used to provide a return thrust for the valve core 3 after the valve is opened. By adjusting the elastic force of the return spring 7, the valve pressure difference when the valve core 3 returns can be controlled to change between 0.2MPa-10MPa.

[0024] The specific steps of the open-close pressure adjustable relief valve of the present invention to realize the valve opening under high pressure and the valve closing under low pressure are:

[0025] (1) By rotating and adjusting the connection position between the annular limit nut 11 and the rear end of the valve core 3, the minimum distance between the upper magnet 5 and the lower magnet 6 is controlled, and then the safety overflow pressure is adjusted, and the open and close pressure adjustable overflow valve is installed on a large volume container containing a high-compressibility fluid using a threaded structure or a flange structure;

[0026] (2) When the pressure of the large-volume container exceeds the set safety overflow pressure, the valve core 3 is pushed out from the inlet 1 under the fluid pressure, and the open-close pressure adjustable overflow valve is in the open state;

[0027] (3) After the pressure-adjustable relief valve is opened, the fluid impact force under the pressure difference before and after the pressure-adjustable relief valve is greater than the elastic force of the return spring 7, and the pressure-adjustable relief valve begins to continuously release pressure;

[0028] (4) After the pressure-adjustable relief valve continues to release pressure for a period of time, the pressure difference before and after the pressure-adjustable relief valve decreases, the fluid impact force is smaller than the elastic force of the return spring 7, and the valve core 3 returns to its original position under the elastic force of the return spring 7.

[0029] The working principle of the present invention is as follows: the magnetic attraction between permanent magnets decreases sharply as the distance increases. When the distance between opposite-sex permanent magnets is small, their strong magnetic force can maintain a high safety pressure when the relief valve is closed; when the pressure of the container fluid exceeds the safety pressure, the magnetic force between the opposite-sex permanent magnets decreases sharply as the displacement of the valve core 3 increases, the closing force of the pressure-adjustable relief valve decreases, and the valve core 3 can be opened for a long time under the impact force of the fluid, so as to fully relieve the pressure of a large-volume container containing a highly compressible fluid; the spring elastic force is used to provide the valve core 3 with a return elastic force, so as to control the minimum discharge pressure difference of the valve, and then control the discharge time and discharge volume; thus, the safety hazards of insufficient pressure relief and excessive pressure are avoided.

Claims

1. A pressure-adjustable relief valve, the main structure of which includes an inlet, a valve core, a three-claw magnet fixing ring, a return spring, a three-claw reverse thrust fixing ring, and a housing, characterized in that: It also includes a lower magnet and an annular limit nut; the shell is a tubular structure, and an inlet is arranged in the front of the shell, the inlet is composed of a combination of a conical tube cavity on the front and a cylindrical smooth tube cavity at the rear, and the conical tube cavity is used to generate a fluid with a certain flow rate; the inlet is sealed and connected to the valve core in a slot-type manner, and the valve core can enter or be pulled out from the inlet, and a lower magnet is fixedly sleeved on the valve core, and a three-claw magnet fixing ring is arranged on one side of the lower magnet, and the valve core passes through the three-claw magnet fixing ring, and the three-claw magnet fixing ring is fixedly connected to the shell as a whole, and a fluid channel is opened between the three-claw magnet fixing ring and the shell. ; An upper magnet is installed in the three-claw magnet fixing ring, and the contact surfaces of the upper magnet and the lower magnet have opposite polarities and there is magnetic attraction; the rear part of the valve core passes through the three-claw reverse thrust fixing ring, and the three-claw reverse thrust fixing ring is fixedly connected to the shell as a whole, and a fluid channel is opened between the three-claw reverse thrust fixing ring and the shell; a return spring is arranged on the front side of the three-claw reverse thrust fixing ring, and the front end of the return spring is connected to the retaining ring, and the retaining ring is fixed on the valve core, and the three-claw reverse thrust fixing ring and the retaining ring are used to fix the return spring and provide spring reverse thrust; the rear end of the valve core is threadedly connected to the annular limit nut, and an outlet is opened at the rear of the shell; The lower magnet fixedly mounted on the valve core is in the shape of a circular ring, and three protrusions are evenly distributed on the outer side of a three-claw magnet fixing ring arranged on one side of the lower magnet. The three protrusions of the three-claw magnet fixing ring are fixedly connected to the outer shell as a whole through fixing screws, and three fluid channels are formed between the three protrusions of the three-claw magnet fixing ring and the outer shell; an annular upper magnet is installed in the three-claw magnet fixing ring, and the upper magnet and the lower magnet are composed of permanent magnets and exist in pairs. The magnetic attraction force of a pair of upper magnets in close contact with the lower magnet can provide a fluid holding pressure of 20MPa-40MPa for the valve core; according to the specific application scenario and the required fluid holding pressure, the combination of the lower magnet installed on the valve core and the upper magnet installed on the three-claw magnet fixing ring can be installed in 1-10 pairs, thereby realizing the setting of the valve safety overflow pressure within the range of 20MPa-400MPa; The rear end of the valve core is threadedly connected to the annular limit nut by a fine thread with a pitch of 0.5mm-1mm. By adjusting the annular limit nut, the minimum spacing between the upper magnet and the lower magnet can be controlled to vary between 0mm-40mm, thereby finely adjusting the valve safety overflow pressure with an accuracy of 0.1MPa-0.2MPa and a maximum range of 40MPa; when the valve is opened, the valve core displaces 10cm, and the distance between the upper magnet and the lower magnet simultaneously increases by 10cm. At this time, the magnetic attraction force between the upper magnet and the lower magnet decreases sharply and is less than the spring force; the return spring is used to provide a return thrust for the valve core after the valve is opened. By adjusting the elastic force of the return spring, the valve pressure difference when the valve core returns can be controlled to vary between 0.2MPa-10MPa.

2. The pressure-adjustable relief valve according to claim 1 is characterized in that: The smooth tube cavity is in contact with the valve core slot-type gap, the contact gap is less than 0.02mm, the maximum length of the valve core that can be extended into the smooth tube cavity is 10cm, when the valve core is in contact with the smooth tube cavity in the inlet, the valve is closed; when the valve core is separated from the smooth tube cavity in the inlet, the valve is opened; the sealing ring is fixedly sleeved on the outside of the valve core, and the sealing ring is used to provide a gap seal between the smooth tube cavity and the valve core.

3. The open and close pressure adjustable relief valve according to claim 1 or claim 2, characterized in that: The outer side of the three-claw reverse thrust fixing ring is evenly distributed with three protrusions, the three protrusions of the three-claw reverse thrust fixing ring are fixedly connected to the outer shell through fixing screws, and three fluid channels are formed between the three protrusions of the three-claw reverse thrust fixing ring and the outer shell.

4. The open and close pressure adjustable relief valve according to claim 3 is characterized in that: The specific steps for the open-close pressure adjustable relief valve to open the valve under high pressure and close the valve under low pressure are: (1) By rotating and adjusting the connection position between the annular limit nut and the rear end of the valve core, the minimum distance between the upper magnet and the lower magnet is controlled, and then the safety overflow pressure is adjusted. The open-close pressure adjustable overflow valve is installed on a large volume container containing a highly compressible fluid using a threaded structure or a flange structure; (2) When the pressure of the large volume container exceeds the set safety overflow pressure, the valve core is pushed out from the inlet under the fluid pressure, and the open and close pressure adjustable overflow valve is in the open state; (3) After the pressure-adjustable relief valve is opened, there is a pressure difference before and after the fluid passes through the pressure-adjustable relief valve. Under this pressure difference, the fluid impact force is greater than the return spring force, and the pressure-adjustable relief valve begins to continuously release pressure; (4) After the pressure-adjustable relief valve continues to release pressure for a period of time, the pressure difference before and after the pressure-adjustable relief valve decreases, the fluid impact force is smaller than the return spring force, and the valve core returns to its original position under the return spring force.

Images