A high reliability float level control system

Abstract

The invention discloses a high-reliability float liquid level control system, including a liquid guide tube, on which a stop valve is installed; a gas balance tube, on which a stop valve is installed; and a riser connected to the liquid guide tube and the gas balance tube and extending vertically, wherein the liquid level in the riser is consistent with the liquid level in the container; a float assembly is arranged in the riser, and the float of the float assembly moves with the change of the liquid level in the riser and the container; a signal device is provided on the upper part of the riser, the signal device communicates with an external controller, the signal device monitors the position change of the float assembly in real time and transmits the monitoring signal to the controller, and the controller controls the start and stop or opening adjustment of the regulating valve of the liquid inlet pipe of the container according to the received signal. The control system of the invention places a relatively complex electronic induction control system in an external normal temperature and pressure environment, while the internal float assembly has a simple structure, has high stability and reliability in high pressure or ultra-high pressure working conditions, and has low cost.

Description

Technical Field

[0001] The invention relates to the technical field of container liquid level control, and in particular to a high-reliability float liquid level control system, which can be applied to liquid level monitoring of various containers. Background Art

[0002] Under the background of dual carbon, green and environmentally friendly refrigeration technology has become an important direction of development. Carbon dioxide, as an environmentally friendly natural refrigerant, has been greatly promoted. Carbon dioxide has no short-, medium- or long-term harm to human health and the living environment, so it does not need to be recycled or reprocessed; and carbon dioxide is non-toxic, non-flammable, and will not explode. Its physical and chemical properties are stable and it will not decompose irritating substances. In the carbon dioxide refrigeration system, various pressure vessels are indispensable. Among the liquid level control devices of such pressure vessels, the float type liquid level control commonly used by other refrigerants cannot be reliable and practical due to the excessive pressure of carbon dioxide; the tuning fork type control is unstable in sensitivity due to factors such as the refrigerant or the lubricating oil containing a certain viscosity in the refrigerant; at the same time, the currently commonly used radar type liquid level control has a high failure rate and is very expensive.

[0003] Therefore, based on the above technical problems, technicians in this field urgently need to develop a high-reliability float liquid level control system. Summary of the invention

[0004] The object of the present invention is to provide a high-reliability float liquid level control system, which converts the liquid level height in a container into an electrical signal (switch or analog signal) to control the start and stop (or opening) of a liquid supply regulating valve (or electric valve) to ensure that the liquid in the container maintains a certain height range.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A high-reliability float liquid level control system of the present invention is connected to a container and is suitable for monitoring the liquid level of the container. The control system comprises:

[0007] a liquid conduit communicated with the container and located below the liquid level of the container, wherein a stop valve is installed on the liquid conduit;

[0008] a gas balance pipe connected to the container and located above the liquid level of the container, wherein a stop valve is installed on the gas balance pipe; and

[0009] A vertical pipe connected to the liquid guide pipe and the gas balance pipe and extending vertically, wherein the liquid level in the vertical pipe is consistent with the liquid level in the container;

[0010] A float assembly is arranged in the standpipe, and a float of the float assembly moves along with the change of the liquid level in the standpipe and the container;

[0011] A signal device is provided on the upper part of the riser, and the signal device communicates with an external controller. The signal device monitors the position change of the float assembly in real time and transmits the monitoring signal to the controller. The controller controls the start and stop or opening adjustment of the regulating valve of the liquid inlet pipe of the container according to the received signal.

[0012] Furthermore, the float assembly comprises:

[0013] Float;

[0014] A cylindrical magnet connected to the float via a connecting line, wherein one end of the cylindrical magnet connected to the connecting line has a cushion block; and

[0015] A spring installed on one end of the pad close to the float;

[0016] An outer tube of the riser is installed on the upper part of the riser, and the inner diameter of the outer tube of the riser is larger than the outer diameter of the riser and is fixed on the upper end of the riser;

[0017] One end of the spring is connected to the cushion block, and the other end of the spring abuts against the upper end of the riser.

[0018] Furthermore, the density of the float is greater than the density of the liquid, but less than 2.5 times the density of the liquid.

[0019] Furthermore, when the liquid level in the container drops, the height of the float drops, and the cylindrical magnet and the cushion block are pulled downward by the connecting line, and the cylindrical magnet and the cushion block press the spring;

[0020] When the liquid level in the container rises, the height of the float rises, the cylindrical magnet and the cushion block move upward and release the pressure on the spring.

[0021] Furthermore, the signal device is a magnetically controlled switch, and the magnetically controlled switch is divided into:

[0022] High liquid level magnetic switch and low liquid level magnetic switch;

[0023] When the liquid level in the container is at a low level, the float drives the cylindrical magnet and the cushion block to move downward to the low liquid level magnetic control switch through the connecting line, and the low liquid level magnetic control switch transmits a signal to the controller, and controls the regulating valve of the container to open or increase the opening through the controller;

[0024] When the liquid level in the container is at a high level, the float drives the cylindrical magnet and the pad to move upward to the high liquid level magnetic control switch, and the high liquid level magnetic control switch transmits a signal to the controller, and controls the regulating valve of the container to close or reduce the opening through the controller.

[0025] Further, the signal device is a tension sensor or a gravity sensor;

[0026] The tension sensor or gravity sensor is provided with an induction magnet;

[0027] When the liquid level in the container drops, the float drives the cylindrical magnet and the cushion block to move downward and away from the tension sensor or gravity sensor through the connecting line. The tension sensor or gravity sensor senses the change in the attraction force of the cylindrical magnet and outputs an analog signal to the controller, so that the controller controls the regulating valve of the container to open or increase the opening degree.

[0028] When the liquid level in the container rises, the float drives the cylindrical magnet and the pad to rise and approach the tension sensor or the gravity sensor through the connecting line. The tension sensor or the gravity sensor outputs an analog signal to the controller by sensing the change in the attraction of the cylindrical magnet, so that the controller controls the regulating valve of the container to close or reduce the opening.

[0029] In the above technical solution, the present invention provides a high-reliability float liquid level control system, which has the following beneficial effects:

[0030] The control system of the present invention places a relatively complex electronic induction control system in an external normal temperature and pressure environment, while the internal float assembly has a simple structure, high stability and reliability when used under high pressure or ultra-high pressure, and low cost.

[0031] The control system of the present invention can replace other liquid level control devices currently in use. Due to its obvious advantages in applying to liquid level control of carbon dioxide refrigeration system containers, it will play a positive role in popularizing and promoting green, low-carbon and environmentally friendly carbon dioxide refrigeration systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. It is obvious that the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0033] Figure 1 A state diagram of a high liquid level of a first implementation of a high-reliability float liquid level control system disclosed in an embodiment of the present invention;

[0034] Figure 2 A low liquid level state diagram of a first implementation of a high-reliability float liquid level control system disclosed in an embodiment of the present invention;

[0035] Figure 3A state diagram of a high liquid level of a second implementation of a high-reliability float liquid level control system disclosed in an embodiment of the present invention;

[0036] Figure 4 This is a low liquid level state diagram of a second implementation manner of a high-reliability float liquid level control system disclosed in an embodiment of the present invention.

[0037] Description of reference numerals:

[0038] 101, standpipe; 102, liquid guide tube; 103, gas balance tube;

[0039] 2. Signaling device;

[0040] 301, float; 302, connecting line; 302, cylindrical magnet;

[0041] 401, spring; 402, cushion block;

[0042] 501, high liquid level magnetic switch; 502, low liquid level magnetic switch;

[0043] 601. Tension sensor or gravity sensor; 602. Induction magnet;

[0044] 7. Container; 8. Controller; 9. Control valve. DETAILED DESCRIPTION

[0045] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0046] See also Figures 1 to 4 As shown;

[0047] A high-reliability float liquid level control system of this embodiment is connected to the container 7 and is suitable for monitoring the liquid level of the container 7. The control system includes:

[0048] a liquid conduit 102 connected to the container 7 and located below the liquid level of the container 7, and a stop valve is installed on the liquid conduit 102;

[0049] A gas balance pipe 103 connected to the container 7 and located above the liquid level of the container 7, and a stop valve is installed on the gas balance pipe 103; and

[0050] A vertically extending standpipe 101 connected to the liquid guide tube 102 and the gas balance tube 103, wherein the liquid level in the standpipe 101 is consistent with the liquid level in the container 7;

[0051] A float assembly is provided in the riser 101, and a float 301 of the float assembly moves along with the change of the liquid level in the riser 101 and the container 7;

[0052] A signal device 2 is provided on the upper part of the riser 101, and the signal device 2 communicates with an external controller 8. The signal device 2 monitors the position change of the float assembly in real time and transmits the monitoring signal to the controller 8. The controller 8 controls the start and stop or opening adjustment of the regulating valve 9 of the liquid inlet pipe of the container 7 according to the received signal.

[0053] Specifically, this embodiment discloses a float liquid level control system, which is applied to the liquid level monitoring of any container. The control system mainly includes a riser 101 connected by a liquid guide tube 102 and a gas balance tube 103, an internal float assembly and an external signal device 2, and a controller 8; wherein, the riser 101 is consistent with the liquid level in the container 7 through the principle of a communicating vessel, and the operation of the liquid level control system of this embodiment has nothing to do with the internal pressure, as long as its design pressure is equivalent to that of the pressure vessel, but the riser 101 must be kept in a vertical state during installation. At the same time, the liquid guide tube 102 and the riser 101 of this embodiment can be in the form of vertical distribution, or other angles, wrapped or in a straight-through form, or directly inserted below the liquid level of the container 7, as long as it is not easy to accumulate oil or dirt. The float 301 of the float assembly will float up or down with the change of the liquid level in the riser 101 and the container 7, thereby triggering the external signal device 2 to generate a switch signal or an analog signal, and communicate with the controller 8 to control the start and stop or opening adjustment of the regulating valve 9 of the container 7 through the controller 8.

[0054] Preferably, the float assembly of this embodiment includes:

[0055] Float 301;

[0056] A cylindrical magnet 303 connected to the float 301 via a connecting line 302, wherein one end of the cylindrical magnet 303 connected to the connecting line 302 has a pad 402; and

[0057] A spring 401 mounted on a pad 402 close to one end of the float 301;

[0058] An outer tube of the riser is installed on the upper part of the riser 101, and the inner diameter of the outer tube of the riser is larger than the outer diameter of the riser 101 and is fixed to the upper end of the riser 101;

[0059] One end of the spring 401 is connected to the cushion block 402 , and the other end of the spring 401 abuts against the upper end of the riser 101 .

[0060] As a preferred implementation, the density of the float 301 of this embodiment is greater than the density of the liquid, but less than 2.5 times the density of the liquid.

[0061] First, this embodiment further defines the structural composition of the float assembly, which includes a float 301 that rises and falls with the liquid level inside, a cylindrical magnet 303 and a pad 402 connected to the float 301 through a connecting line 302, and a spring 401. The wire diameter d of the spring 401 of this embodiment is appropriately small, while the outer diameter D is appropriately large, and the free height is appropriately high, so that the telescopic distance is appropriately large when subjected to force.

[0062] The float assembly of this embodiment performs the following actions as the liquid level changes during use:

[0063] When the liquid level in the container 7 drops, the height of the float 301 drops, and pulls the cylindrical magnet 303 and the cushion block 402 downward through the connecting line 302, and the cylindrical magnet 303 and the cushion block 402 press the spring 401;

[0064] When the liquid level in the container 7 rises, the float 301 rises in height, the cylindrical magnet 303 and the cushion block 402 move upward and release the pressure on the spring 401 .

[0065] The float 301 of this embodiment can be solid or hollow, and can be made of metal or non-metal. Its density is greater than that of the liquid, and since it can be completely submerged in the liquid, it is not easily affected by the fluctuation of the liquid level, and has high stability in use. Compared with the radar-type liquid level control device, it has a low manufacturing cost, a simple structure, is easy to install, and has high reliability, and can be used in various liquid level monitoring and control locations.

[0066] Embodiment 1:

[0067] See also Figure 1 to Figure 2 As shown, in this embodiment 1, the magnetically controlled switch is used as the signal device 2 to further explain and illustrate the system;

[0068] The signal device 2 of the first embodiment is a magnetically controlled switch, which is divided into:

[0069] A high liquid level magnetic control switch 501 and a low liquid level magnetic control switch 502;

[0070] When the liquid level in the container 7 is at a low level, the float 301 drives the cylindrical magnet 303 and the cushion block 402 to move down to the low liquid level magnetic control switch 502 through the connecting line 302, and the low liquid level magnetic control switch 502 transmits a signal to the controller 8, and controls the regulating valve 9 of the container 7 to open or increase the opening through the controller 8;

[0071] When the liquid level in the container 7 is at a high level, the float 301 drives the cylindrical magnet 303 and the pad 402 to move up to the high liquid level magnetic control switch 501, and the high liquid level magnetic control switch 501 transmits a signal to the controller 8, and controls the regulating valve 9 of the container 7 to close or reduce the opening through the controller 8.

[0072] When the signal device 2 of the first embodiment uses a magnetic switch, when the liquid level is at a low level, the buoyancy of the float 301 is minimal. Due to the gravity of the float 301 itself, the cylindrical magnet 303 and the pad 402 are moved by the connecting line 302 to compress the spring 401. At this time, the cylindrical magnet 303 has moved to the low liquid level magnetic switch 502, triggering the low liquid level magnetic switch 502 to operate. The signal is transmitted to the controller 8, which controls the opening of the regulating valve 9 through logical operations, and the liquid enters the container 7 and the liquid level rises.

[0073] Secondly, as the liquid level rises, when the liquid level reaches a high position, the buoyancy of the float 301 is the largest. Due to the buoyancy of the float 301, the cylindrical magnet 303 and the pad 402 are controlled to move upward and release the compressed spring 401 through the connecting line 302. At this time, the cylindrical magnet 303 has moved to the high liquid level magnetic control switch 501, triggering the high liquid level magnetic control switch 501 to operate, and the signal is transmitted to the controller 8. Through logical operation, the regulating valve 9 is controlled to close, and the liquid cannot enter the container 7, and the liquid level does not rise anymore. In this way, the liquid level in the container 7 is controlled to maintain a certain height range.

[0074] Embodiment 2:

[0075] See also Figure 3 to Figure 4 As shown, in the second embodiment, the tension sensor or gravity sensor 601 is used as the signal device 2 to further explain and illustrate the system;

[0076] The signal device 2 of the second embodiment is a tension sensor or a gravity sensor 601;

[0077] The tension sensor or gravity sensor 601 is provided with an induction magnet 602;

[0078] When the liquid level in the container 7 drops, the float 301 drives the cylindrical magnet 303 and the cushion block 402 to move downward and away from the tension sensor or gravity sensor 601 through the connecting line 302. The tension sensor or gravity sensor 601 senses the change in the attraction of the cylindrical magnet 303 and outputs an analog signal to the controller 8, so as to control the regulating valve 9 of the container 7 to open or increase the opening degree through the controller 8;

[0079] When the liquid level in the container 7 rises, the float 301 drives the cylindrical magnet 303 and the pad 402 to rise and approach the tension sensor or gravity sensor 601 through the connecting line 302. The tension sensor or gravity sensor 601 outputs an analog signal to the controller 8 by sensing the change in the attraction of the cylindrical magnet 303, so as to control the regulating valve 9 of the container 7 to close or reduce the opening through the controller 8.

[0080] When the liquid level is at a low position, the buoyancy of the float 301 is minimal. Due to the gravity of the float 301 itself, the cylindrical magnet 303 and the pad 402 are driven to compress the spring 401 through the connecting line 302. At this time, the cylindrical magnet 303 has moved to the lowest end position, and the distance from the induction magnet 602 is the largest, that is, the attraction between the two is the smallest. At this time, the analog value of the output signal of the tension sensor or gravity sensor 601 is also the smallest. After receiving the signal, the controller 8 controls the regulating valve 9 to increase the opening, and the liquid level enters the container 7 and the liquid level rises; as the liquid level rises, when the liquid level reaches a high position, the float 301 The buoyancy is the largest. Since the float 301 is affected by the buoyancy, the cylindrical magnet 303 and the pad 402 are driven by the connecting line 302 to release the compressed spring 401. At this time, the cylindrical magnet 303 has moved to the highest end position, and the distance from the induction magnet 602 is the smallest, that is, the attraction between the two is the largest. At this time, the analog value of the output signal of the tension sensor or gravity sensor 601 is also the largest. After receiving the signal, the controller 8 controls the regulating valve 9 to reduce the opening, the amount of liquid entering the container 7 is reduced and the liquid level no longer rises, so as to control the liquid level in the container 7 to maintain a certain height range.

[0081] The system of this embodiment can realize continuous adjustment of liquid level, or remote liquid level simulation and monitoring.

[0082] In the above technical solution, the present invention provides a high-reliability float liquid level control system, which has the following beneficial effects:

[0083] The control system of the present invention places a relatively complex electronic induction control system in an external normal temperature and pressure environment, while the internal float assembly has a simple structure, high stability and reliability when used under high or ultra-high pressure, and low cost.

[0084] The control system of the present invention can replace other liquid level control devices currently in use. Due to its obvious advantages in applying to liquid level control of carbon dioxide refrigeration system containers, it will play a positive role in popularizing and promoting green, low-carbon and environmentally friendly carbon dioxide refrigeration systems.

[0085] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A high reliability float level control system, characterized in that: The control system is connected to the container (7) and is suitable for monitoring the liquid level of the container (7), and the control system comprises: a liquid guide tube (102) connected to the container (7) and located below the liquid level of the container (7), wherein a stop valve is installed on the liquid guide tube (102); a gas balance pipe (103) connected to the container (7) and located above the liquid level of the container (7), wherein a stop valve is installed on the gas balance pipe (103); and a vertically extending standpipe (101) connected to the liquid guiding pipe (102) and the gas balance pipe (103), wherein the liquid level in the standpipe (101) is consistent with the liquid level in the container (7); A float assembly is arranged in the standpipe (101), and a float (301) of the float assembly moves along with changes in the liquid level in the standpipe (101) and the container (7); The upper part of the riser (101) is provided with a signal device (2), the signal device (2) communicates with an external controller (8), the signal device (2) monitors the position change of the float assembly in real time and transmits the monitoring signal to the controller (8), and the controller (8) controls the start and stop or opening adjustment of the regulating valve (9) of the liquid inlet pipe of the container (7) according to the received signal; The float assembly comprises: float(301); a cylindrical magnet (303) connected to the float (301) via a connecting line (302), wherein one end of the cylindrical magnet (303) connected to the connecting line (302) has a cushion block (402); and a spring (401) mounted on one end of the cushion block (402) close to the float (301); A standpipe outer tube is installed on the upper part of the standpipe (101), and the inner diameter of the standpipe outer tube is greater than the outer diameter of the standpipe (101) and is fixed to the upper end of the standpipe (101); One end of the spring (401) is connected to the cushion block (402), and the other end of the spring (401) abuts against the upper end of the riser (101); When the liquid level in the container (7) drops, the height of the float (301) drops, and the cylindrical magnet (303) and the cushion block (402) are pulled downward through the connecting line (302), and the cylindrical magnet (303) and the cushion block (402) press the spring (401); When the liquid level in the container (7) rises, the height of the float (301) rises, the cylindrical magnet (303) and the cushion block (402) move upward and release the pressure on the spring (401); The signal device (2) is a magnetically controlled switch, which is divided into: A high liquid level magnetic switch (501) and a low liquid level magnetic switch (502); When the liquid level in the container (7) is at a low level, the float (301) drives the cylindrical magnet (303) and the cushion block (402) to move downward to the low liquid level magnetic control switch (502) via the connecting line (302); the low liquid level magnetic control switch (502) transmits a signal to the controller (8), and controls the regulating valve (9) of the container (7) to open or increase its opening degree via the controller (8); When the liquid level in the container (7) is at a high level, the float (301) drives the cylindrical magnet (303) and the cushion block (402) to move upward to the high liquid level magnetic control switch (501), and the high liquid level magnetic control switch (501) transmits a signal to the controller (8), and controls the regulating valve (9) of the container (7) to close or reduce its opening through the controller (8).

2. A high reliability float level control system according to claim 1, characterized in that: The float (301) is a solid or hollow body that is resistant to high pressure, and its average density is greater than the density of the liquid and less than 2.5 times the density of the liquid.

3. A high reliability float level control system according to claim 1, characterized in that: The signal device (2) is replaced by a tension sensor or a gravity sensor (601); The tension sensor or gravity sensor (601) is provided with an induction magnet (602); When the liquid level in the container (7) drops, the float (301) drives the cylindrical magnet (303) and the cushion block (402) to move downward and away from the tension sensor or gravity sensor (601) through the connecting line (302); the tension sensor or gravity sensor (601) senses the change in the attraction force of the cylindrical magnet (303) and outputs an analog signal to the controller (8), so that the controller (8) controls the regulating valve (9) of the container (7) to open or increase the opening degree; When the liquid level in the container (7) rises, the float (301) drives the cylindrical magnet (303) and the cushion block (402) to rise and approach the tension sensor or gravity sensor (601) through the connecting line (302); the tension sensor or gravity sensor (601) senses the change in the attraction force of the cylindrical magnet (303) and outputs an analog signal to the controller (8), so that the controller (8) controls the regulating valve (9) of the container (7) to close or reduce the opening.

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