Low-pressure degassing device

Abstract

This invention relates to a method for testing a degassing device for degassing a gas-containing liquid in a cooling or heating device. The degassing device includes: - a main flow channel through which a main liquid flows; - at least one flow path extending between the main flow channel and a degassing zone; - a degassing housing defining an internal volume, wherein the internal volume substantially corresponds to the degassing zone; - at least one valve; - a pressure reducing device connected to the degassing housing; - a pressure sensor configured to measure pressure in the degassing zone; - a gas outlet in the degassing housing, the gas outlet including an outlet pipe and an outlet closure body, wherein the outlet pipe can be closed by the outlet closure body; - a control unit including a first and / or a second test module connected to the pressure sensor and configured to receive a differential pressure signal from the pressure sensor. The method includes the steps of: a) closing at least one valve and measuring a first pressure in the degassing housing using the pressure sensor; b) measuring a second pressure in the degassing housing using the pressure sensor after a period of time; c) comparing the second pressure with the first pressure by the control unit to determine a difference, wherein when a difference exists between the first pressure and the second pressure, a difference signal is generated by the control unit.

Description

Technical Field

[0001] This invention relates to the field of degassing liquids containing gas in cooling or heating equipment, and more particularly to apparatus and methods for degassing liquids. Background Technology

[0002] In the field of degassing liquids, there are various apparatuses and methods.

[0003] US2011214571A1 discloses a degassing apparatus that utilizes a vacuum chamber to locally reduce pressure in order to separate gas from a liquid. The apparatus includes a channel through which the liquid flows, and the liquid also passes through the vacuum chamber. Within this vacuum chamber, the main flow channel is defined by a permeable region through which gas can pass, but which liquid cannot.

[0004] Outside this permeable area, a housing connected to a vacuum pump is provided. The vacuum pump is configured to generate a continuous vacuum level within the housing for degassing of the liquid. Furthermore, a vent is connected to the housing to allow ventilation flow into the vacuum chamber, thereby reducing condensation within the housing.

[0005] In this invention, several drawbacks of this device have been recognized. The use of the permeable zone allows a certain amount of liquid to migrate into the housing, leading to contamination of the housing and consequently, the vacuum pump, and potentially reducing the amount of liquid in the main flow channel over time. Furthermore, the permeable zone will also degrade over time due to the accumulation of contaminants. This accumulation prevents gas passage, ultimately making degassing impossible.

[0006] Furthermore, since the device requires a continuous vacuum to operate, it may consume a significant amount of energy. Additionally, supplying gas from the outside to the housing via vents will only require the vacuum pump to operate more actively to maintain the required vacuum level and consume even more energy.

[0007] In addition, vacuum pumps generate a lot of noise, especially those that run continuously. This makes them less suitable for home applications.

[0008] EP3764001A1 discloses an apparatus in which a portion of the main stream flows through a bypass branch, passes through a venturi device, and enters a degassing chamber. On the other side of the degassing chamber, the branch portion returns to the main stream.

[0009] In addition, the degassing conduit leads from the suction zone to the bypass and merges with the bypass in the Venturi device. Due to the Venturi device, the pressure in this degassing conduit is lower than in the rest of the circuit. The lower pressure causes the dissolved gas to separate, and the gas can then be discharged through a ventilator in the degassing chamber.

[0010] The drawback of this device is that the liquid in the loop must always move at a specific velocity to enable the Venturi apparatus to operate by creating a pressure difference between the reflux and the branch flow. If the velocity is insufficient, an additional pump is required to generate the pressure difference. This results in either a suboptimal operating device or an expensive device due to the need for additional pumps. Such pumps also increase the energy consumption of the device.

[0011] Furthermore, because the system depends on the velocity of the liquid in the loop, it may be difficult to control the pressure in the system and the resulting degassing process.

[0012] US4602923A discloses an apparatus for degassing a liquid medium. The apparatus includes a check valve 41 that prevents air inflow while allowing separated gas to flow out (column 5, lines 44-49). Here, the check valve 41, the vent valve 40, and the float for externally sealing the device are located above the possible liquid level. D1 has a disadvantage in this respect, namely, the degassing efficiency is quite low due to air in the degassing zone, which hinders pressure reduction.

[0013] EP3036025A1 discloses an apparatus configured to degas a liquid in a fluid system. A portion of the liquid in the main flow channel is branched and then passes through a filter, an actuated valve, a check valve, a reservoir, a pump, and another check valve before returning to the main flow channel. When the reservoir is filled to a desired level, the actuated valve is closed and the pump is operated to reduce the pressure in the reservoir to release gas from the liquid.

[0014] The drawback of this device is that the pump must operate in conjunction with the actuating valve. To do this, a relatively complex control mechanism is required. Furthermore, because pumps are typically noisy and inefficient, this device is considered unsuitable for home use.

[0015] Purpose of the invention

[0016] The object of the present invention is to provide an apparatus and method for degassing liquids, and by doing so, to overcome at least one of the aforementioned disadvantages. Summary of the Invention

[0017] To achieve this objective, the present invention provides a degassing device for degassing a liquid containing gas in a cooling or heating device, the degassing device comprising:

[0018] - The main flow channel is defined by a tube extending between a first side and a second side, through which the main fluid flow passes during operation.

[0019] - At least one flow path extending between the main flow channel and the degassing zone, the flow path being configured to allow communication between the degassing zone and the main flow channel.

[0020] - A degassing shell that defines an internal volume, wherein the internal volume substantially corresponds to the degassing zone.

[0021] - At least one valve is movable between a closed position and an open position, wherein in the closed position, the valve blocks the flow passage and closes the degassing zone from the main flow channel, and wherein in the open position, the valve does not block the flow passage.

[0022] - A pressure reducing device, connected to the degassing housing, wherein during operation, the pressure reducing device is configured to reduce the pressure in the degassing zone relative to the pressure in the main flow channel.

[0023] - Gas outlet, which is located in the degassing shell, includes:

[0024] o An outlet pipe and an outlet closing body, wherein the outlet pipe can be closed by the outlet closing body.

[0025] An overflow valve that limits a gas outlet opening, wherein the overflow valve is configured to close the gas outlet opening when the liquid level is above an overflow threshold level, and wherein the overflow threshold level is above an outlet closure body.

[0026] The degassing device is configured to perform a degassing cycle, which includes:

[0027] - A pressure reduction step, during which the gas outlet and at least one valve are closed, wherein the pressure reduction device is configured to degas the gas-containing liquid by reducing the pressure, wherein at the start of the pressure reduction step, the liquid level in the degassing device is at an overflow threshold level and the outlet shut-off body seals the outlet pipe.

[0028] - Gas discharge step, during which the pressure in the degassing zone increases and the separated gas passes through the outlet pipe and the gas outlet opening.

[0029] This invention results in effective degassing. Because the outlet closure is submerged (below the liquid surface), there is no air (gas) or very little air (gas) in the degassing zone. As a result, compressibility (or possibly negative compressibility) is low, leading to an effective decompressibility step, which in turn leads to effective degassing.

[0030] In the implementation scheme, the device includes two flow paths: a first flow path is a branch flow path configured to branch off a branch that is part of the main flow; and a second flow path is a return flow path extending between the degassing zone and the main flow path, configured to return the return flow to the main flow.

[0031] By branching off a portion of the main flow in a cooling or heating device and by blocking the branch flow path and / or return flow path, a pressure reducing device can lower the pressure experienced by the branch section (i.e., the tributary). When the pressure drops below the level inside the main flow channel, the gas dissolved in the liquid becomes less soluble and separates from the liquid. The gas that has separated from the liquid can then be removed from the degassing device before the liquid merges back into the main flow. In doing so, the amount of gas dissolved in the liquid in the cooling or heating device can be reduced.

[0032] When the liquid is initially at the level where the float is in its floating position, and the liquid level begins to drop due to the operation of the pressure reducing device, the float moves downwards to the end of its connecting outlet pipe and closes the lower position of the outlet pipe. The float not only replaces the need for an actively operated gas outlet valve, but also reduces the amount of free gas within the degassing zone by closing the outlet pipe once the liquid has flown out. This, in turn, helps to reduce pressure and can increase the amount of gas that can be separated from the gas-containing liquid.

[0033] In one embodiment, the degassing device may include a first valve movable between a closed position and an open position, wherein in the closed position, the first valve blocks a branch flow path and closes the degassing zone from the main flow path. A second valve movable between the closed and open positions may be used to block a return flow path to close the degassing zone from the main flow path.

[0034] By utilizing two separate valves to close the branch flow path and the return flow path, these two valves can be placed at a distance from each other along the main flow path. Doing so increases the renewal of the liquid in the degassing shell.

[0035] In one embodiment, the pressure-reducing device is connected to the degassing housing and includes a piston, a cylinder, and a piston actuator. The piston is movable between an idle pressure position and a low-pressure position and is in open communication with an internal volume. In the low-pressure position of the piston, the degassing zone extends into the cylinder and is larger than in the idle pressure position of the piston. Here, the degassing zone is defined by the degassing housing, at least a portion of the outer surface of the piston, and / or at least a portion of the inner surface of the cylinder. The piston actuator can be one of a mechanical actuator, an electric actuator, a magnetic actuator, a hydraulic actuator, and a pneumatic actuator.

[0036] By moving the piston from the idle pressure position to the low pressure position, the degassing zone is drawn into the cylinder and becomes larger than it would be in the idle pressure position of the housing. Because the volume of the degassing zone increases while the amount of liquid contained within it remains essentially constant, the pressure exerted on the liquid in the degassing zone decreases. This reduced pressure causes the liquid to degas.

[0037] In one embodiment, the piston's retracted position corresponds to the low-pressure position and the piston's extended position corresponds to the idle pressure position. Alternatively, the piston's extended position corresponds to the low-pressure position and the piston's retracted position corresponds to the idle pressure position.

[0038] In the first case, the piston actuator will pull the piston to move it to the low-pressure position, while in the second case, the piston actuator will push the piston to move it to the low-pressure position.

[0039] In one embodiment, the piston actuator is fixed to the degassing housing via one or more elastic members, and the piston actuator is elastically movable between a first actuator position and a second actuator position.

[0040] The piston actuator can be fixed to the degassing housing via one or more elastic members in order to absorb mechanical vibrations.

[0041] In the implementation scheme, the piston is at least partially movable within the cylinder.

[0042] In the implementation scheme, the piston is movable in a direction substantially parallel to the main flow channel. By placing the pressure-reducing device in an orientation that allows the piston to move substantially parallel to the main flow channel, efficient space utilization can be achieved. Because the orientation is substantially parallel to the main flow channel, the space occupied by the degassing device in directions away from the main flow channel can be reduced.

[0043] In the implementation scheme, the piston is movable in a direction substantially orthogonal to the main flow channel. Another efficient use of space can be achieved by placing the pressure-reducing device in an orientation that allows the piston to move in a direction substantially orthogonal to the main flow channel. Because the orientation is substantially orthogonal to the main flow channel, the space occupied by the degassing device in the direction along the main flow channel can be reduced.

[0044] In this implementation, the piston is in direct contact with the liquid, and preferably, there is no membrane between the piston and the degassing zone. Because of the absence of a membrane, the device becomes more robust and may require less maintenance. The absence of a membrane means one less potentially failing component and no membrane that could clog the device and hinder its operation. Since the piston can act directly on the liquid without first deforming elastic components such as membranes, decompression can be achieved more quickly.

[0045] In the implementation, the piston includes at least one seal, particularly two seals spaced apart from each other, especially O-rings, and more particularly, double-lip seals. Such seals can be used to improve the performance of the pressure reducing device by increasing sealing capacity and thus reducing pressure differential.

[0046] In the implementation, the pressure reducing device is located at the lower part of the degassing shell and is configured to operate below the liquid level in the degassing shell.

[0047] By placing the pressure reducing device at the bottom of the degassing housing and configuring it to operate below the liquid level, the pressure reducing device can be positioned close to the main flow channel. This reduces the space occupied by the degassing unit.

[0048] In one embodiment, the piston includes an actuator end and the first valve is a check valve. The actuator end is configured to engage the first valve, wherein movement of the piston from a retracted state to an extended state moves the first valve from an idle closed position to an open position via the actuator end. Movement of the piston from an extended state to a retracted state moves the first valve from an open position to an idle closed position via the actuator end.

[0049] In this implementation, a branch passage extends through the cylinder between the main flow channel and the degassing zone, and the piston movement is configured to move the first valve to the closed state. In doing so, a single piston operation can close the branch passage and reduce the pressure within the degassing zone. Therefore, no additional actuator is required to move the first valve to the closed state.

[0050] In the implementation, the cavity is located in the cylinder and between the main flow passage and the piston, wherein the branch flow path extends through the cavity.

[0051] In the implementation scheme, the cylinder defines a branch orifice, wherein the branch path extends through the branch passage, through the cavity, and through the branch orifice into the internal volume.

[0052] In the implementation plan, the branch flow route is defined by the cylinder, the branch orifice, and the piston.

[0053] In the implementation, the first valve is integrated into the pressure reducing device, specifically in the piston, which includes a portion that blocks the branch path at the low-pressure position. Here, movement of the piston towards the low-pressure position also closes the branch path. This not only reduces the need for an actuator to close the branch path but also eliminates the need for a moving part, potentially reducing necessary maintenance.

[0054] In this implementation, the second valve is a check valve. In such an implementation, when the pressure is reduced by the pressure reducing device, the relatively higher pressure in the main flow channel forces the second check valve to close. In doing so, an actuator may not be required to close the valve.

[0055] In the implementation scheme, the outlet shut-off body includes a gas outlet valve that, in the open state, allows gas and / or liquid to flow between the outside and the degassing zone, and in the closed position, seals off the degassing zone. Specifically, the gas outlet valve is a ball valve or a check valve. In doing so, the entire degassing zone can be filled with liquid, and liquid degassing can be performed more efficiently compared to the initial situation where more liquid and / or more gas would be present, because pressure reduction can be achieved more easily and quickly.

[0056] In the implementation, the float chamber includes an overflow valve (also called a float valve) that defines a gas outlet opening, and when the liquid level is above a second predetermined level (also called an overflow threshold level), the outlet shut-off body moves to an upper position, thereby closing the overflow valve. In doing so, when the amount of liquid flowing into the degassing housing risks overflowing the degassing housing, the gas outlet opening is closed by the float, thereby preventing liquid from overflowing the degassing device. Thereafter, liquid will either stop flowing in through the branch passage or will enter through the branch passage and will flow out through the return passage.

[0057] In this implementation, the float includes a protrusion located on its underside, and the external dimensions of the protrusion substantially match the internal dimensions of the outlet pipe. This protrusion increases the float's sealing capability.

[0058] In the implementation, the relief valve includes a backflow preventer configured to allow gas to escape but not enter the gas outlet; specifically, the backflow preventer is a check valve. When the pressure reducing device is operating, the backflow preventer prevents more particles from being drawn into the degassing zone. In doing so, the increase in volume reduces pressure more effectively and efficiently because no particles can be added to the volume.

[0059] In one embodiment, the float includes an O-ring that closes the outlet pipe in a lower position and / or an O-ring that closes the gas outlet in an upper position. In the lower position, the O-ring defines the closed position.

[0060] In one embodiment, the degassing device further includes a vacuum pump connected to a gas outlet and a porous chamber located within the internal volume of the degassing housing, wherein a branch flow path allows a portion of the main flow to enter the porous chamber and a return flow path extends between the porous chamber and the main flow channel. The porous chamber may comprise a porous element that is permeable to gases and impermeable to liquids.

[0061] By utilizing a combination of a vacuum pump and a porous chamber, the gas outlet does not need to be sealed by a float, as the vacuum pump acts as a check valve for the separated gases. Furthermore, since the porous element is impermeable to liquids, the risk of liquid reaching the vacuum pump, which would be detrimental to its operation, is minimal.

[0062] In this implementation, the main flow channel is constricted between the first and second sides. This constriction increases the pressure near the branch flow path, thereby forcing a portion of the main flow into the degassing housing. The main flow channel may also include a branch separator protruding into the main flow channel and configured to allow a portion of the main flow to branch into the degassing zone. The main flow channel may also include a main flow valve configured to allow a portion of the main flow to branch into the degassing zone.

[0063] In the implementation scheme, the contraction section includes a check valve.

[0064] In one embodiment, the degassing device further includes a bias switch, wherein in a first piston actuator position, the piston actuator engages the bias switch, and in a second actuator position, the switch disengages.

[0065] When the piston actuator operates to move the piston to the low-pressure position, there is a risk of exceeding the maximum undervoltage. When this is about to occur, the low pressure pulls the piston, and thus the piston actuator, away from the switch towards the second actuator position, thereby disengaging the switch. Disengagement of the switch disables the operation of the piston actuator, thus preventing further pressure reduction.

[0066] In one embodiment, the degassing housing includes first and second abutments. Here, a piston extends against the first abutment to move a piston actuator to a first actuator position, and a piston retracts against the second abutment to move a piston to a second actuator position.

[0067] In one embodiment, the degassing device further includes a directional switch configured to operate the piston actuator in a first direction at a first switch position and in a second direction at a second switch position. Here, movement from the first actuator position to the second actuator position causes the directional switch to move from the first switch position to the second switch position, and vice versa.

[0068] In doing so, a system capable of continuous operation without the need for a complex control system is obtained. When the piston has reached the base, the piston actuator automatically changes direction, thereby moving the piston to another base, and so on.

[0069] In one implementation, the directional switch includes a delay component configured to delay the operation of the piston actuator after the switch position has changed.

[0070] This creates idle periods during which the piston does not move and liquid can flow into the degassing zone, or the liquid in the degassing zone remains stationary. This can improve system performance.

[0071] In one embodiment, the degassing device further includes at least one sensor and a control unit configured to read the pressure from the at least one sensor and / or control the pressure reduction device. In doing so, the pressure inside the degassing housing can be monitored and controlled if necessary.

[0072] In this implementation, a first pressure sensor is located in the main flow channel and a second pressure sensor is located in the degassing zone. The control unit can then be configured to operate the pressure reduction device based on the outputs of the first and / or second pressure sensors. The pressure difference between the two channels can be determined by measuring the pressure in both the main flow channel and the degassing zone.

[0073] In one implementation, the pressure reducing device includes a sensor configured to measure the pressure in the degassing zone.

[0074] In this implementation, at least one sensor is a strain gauge or stress gauge. By connecting the strain gauge or stress gauge to the piston or piston actuator, the force acting on the piston or piston actuator can be determined and used to determine the pressure in the degassing housing. The control unit can determine the pressure in the degassing zone.

[0075] In one embodiment, at least one sensor is a current measuring device configured to determine the current required to move the piston. By determining the current required to move the piston, the pressure inside the degassing housing can also be determined based on the force required to move the piston.

[0076] In this implementation, the degassing device further includes a temperature sensor. The temperature sensor may be located in the main flow channel. The temperature sensor measures the temperature of the liquid in the main flow channel, and the control unit reads the temperature sensor readings and controls the pressure reduction device.

[0077] In the implementation scheme, the control unit includes:

[0078] - The first test module, configured to determine the existence of a leak, is configured as follows:

[0079] o Close at least one valve,

[0080] oThen operate the pressure reducing device to decrease or increase the pressure, and

[0081] o Then read at least one pressure sensor,

[0082] o Read at least one pressure sensor a second time after a period of time, and

[0083] The second measured pressure is compared with the first measured pressure to determine the difference, wherein a difference signal is generated.

[0084] and / or

[0085] - The second test module is configured to determine the existence of flow in the mainstream channel. The configuration of the second test module is as follows:

[0086] o Read at least one pressure sensor

[0087] o Then at least one valve is closed.

[0088] o Read at least one pressure sensor a second time after a period of time, and

[0089] The second measured pressure is compared with the first measured pressure to determine the difference, wherein when the difference is less than a threshold, a difference signal indicating insufficient flow is generated.

[0090] By utilizing such a first and / or second test module, the degassing device can be tested to ensure its proper operation and enable timely maintenance.

[0091] In the implementation scheme, the first test module is configured to maintain the pressure in the degassing zone at a constant or substantially constant pressure during the test period by measuring the pressure in the degassing zone, comparing the measured pressure with a target pressure, and operating a pressure-reducing device, thereby maintaining the pressure in the degassing zone at the target pressure. Here, the first test module measures the operating parameters of the pressure-reducing device in a timely manner and is configured to generate a differential signal indicating leakage when the measured operating parameters exceed a predetermined threshold. The operating parameters are, in particular, the piston position and / or the power consumption of the pressure-reducing device.

[0092] Alternatively or additionally, the first test module is configured to keep the piston position constant or substantially constant during the test period. Here, the first test module measures the pressure in the degassing zone during the test period and is configured to generate a differential signal indicating leakage when the pressure difference measured over time exceeds a predetermined threshold.

[0093] In the implementation scheme, the first and / or second test modules determine the difference and,

[0094] When the difference exceeds a threshold, the control unit periodically executes a degassing cycle, and

[0095] When the difference is less than the threshold, the control unit does not perform any degassing cycle.

[0096] By being able to determine whether there is flow in the main channel, the degassing unit only operates when needed. This reduces potential wear and tear and decreases energy consumption.

[0097] In the implementation, the main flow channel is defined by a cup body and a cap body, the cup body including an inlet and an outlet, and a plate projecting downward from the cap body. The plate divides the cup body into an inlet side and an outlet side and allows fluid communication from the inlet side to the outlet side only through a contraction. The cap body also separates the main flow channel from the degassing zone and includes at least one valve located in at least one flow path. The degassing housing includes a cover placed on top of the cap body.

[0098] In this implementation, the degassing zone is connected to the pressure reducing device via piping, and / or the degassing zone and / or the pressure reducing device are connected to the main flow channel via piping. In doing so, various geometries can be obtained to fit the degassing device into various spaces.

[0099] In the implementation scheme, the outlet shut-off body is a check valve, and the check valve is preferably actuated by an actuator, more preferably by the actuator end of a piston.

[0100] Another aspect of the present invention relates to a method for degassing a gas-containing liquid in a cooling or heating device by utilizing a degassing apparatus, the degassing apparatus comprising:

[0101] - Mainstream channel, through which the main fluid flow passes.

[0102] - At least one flow path extending between the main flow path and the degassing zone.

[0103] - A degassing shell that defines an internal volume, wherein the internal volume substantially corresponds to the degassing zone.

[0104] - A valve that can move between a closed position and an open position.

[0105] - A pressure reducing device, which is connected to the degassing housing.

[0106] - Gas outlet, which is located in the degassing shell, includes:

[0107] o An outlet pipe and an outlet closing body, wherein the outlet pipe can be closed by the outlet closing body.

[0108] An overflow valve is provided that limits the gas outlet opening. The overflow valve is configured to close the gas outlet opening when the liquid level is above an overflow threshold level, and the overflow threshold level is higher than the outlet closure level. The degassing device is configured to perform a degassing cycle.

[0109] The method includes the following steps:

[0110] a) A branch of the main stream is made accessible through at least one flow path.

[0111] b) Move at least one valve to its respective closed position, thereby blocking at least one flow path, closing the degassing zone from the main flow path, and shutting off the gas outlet.

[0112] c) Operate the pressure reducing device to reduce the pressure in the degassing zone relative to the pressure in the main flow channel.

[0113] d) Open at least one valve and gas outlet.

[0114] The degassing cycle includes a decompression step comprising steps a), b), and c), and a gas discharge step comprising step d), wherein...

[0115] - During the pressure reduction step, the gas outlet and at least one valve are closed, wherein the pressure reduction device is configured to degas the gas-containing liquid by reducing the pressure, wherein at the start of the pressure reduction step, the liquid level in the degassing device is at the overflow threshold level and the outlet shut-off body closes the outlet pipe.

[0116] - During the gas discharge step, the pressure in the degassing zone increases and the separated gas passes through the outlet pipe and the gas outlet opening.

[0117] The method has the same advantages as the apparatus according to the invention. In step d), the outlet shut-off body no longer closes the outlet pipe. The separated gas travels through the outlet pipe, through the float chamber, and is discharged.

[0118] In the implementation scheme, the outlet shut-off body closes the outlet pipe in the closed position and the predetermined liquid level is above the closed position. This reduces the compressibility of the medium in the degassing zone and improves the degassing of the liquid.

[0119] In the implementation plan, the degassing device includes two flow paths: a first flow path is a branch flow path, and a second flow path is a return flow path.

[0120] In one embodiment, the pressure reducing device is connected to the degassing housing, and the pressure reducing device includes a piston, a cylinder, and a piston actuator. Here, the cylinder may be in open communication with the internal volume, and during step c), the piston moves between an extended position and a retracted position, wherein the degassing zone is defined by the degassing housing and the piston.

[0121] In the retracted position of the piston, the degassing zone extends into the cylinder and is larger than in the extended position of the piston. Here, the degassing zone is defined by the degassing shell, at least a portion of the outer surface of the piston, and / or at least a portion of the inner surface of the cylinder.

[0122] By moving the piston from the extended position to the retracted position, the degassing zone is drawn into the cylinder and becomes larger than it would be in the idle pressure position of the housing. Because the volume of the degassing zone increases while the amount of liquid contained within it remains essentially constant, the pressure exerted on the liquid in the degassing zone decreases. This reduced pressure causes the liquid to degas.

[0123] In one implementation, as the piston moves from the extended position to the retracted position, the degassing zone expands into the cylinder, and the degassing zone is larger in the retracted position than in the extended position. Alternatively, as the piston moves from the retracted position to the extended position, the degassing zone expands into the cylinder, and the degassing zone is larger in the extended position than in the retracted position.

[0124] In the first case, the piston actuator will pull the piston to move it to the low-pressure position, and in the second case, the piston actuator will push the piston to move it to the low-pressure position.

[0125] In the implementation scheme, the branch flow path extends through the cylinder between the main flow channel and the degassing zone, and steps b) and c) occur substantially simultaneously, and the movement of the piston moves at least one of the first valve and the second valve to the closed position, and / or closes the gas outlet.

[0126] In one embodiment, the piston includes an actuator end and the first valve is a check valve. When the piston moves to the extended position, the actuator end moves the first valve to the open position, and when the piston moves to the retracted position, the valve is allowed to move to the closed position.

[0127] In the implementation scheme, the outlet shut-off body includes a float, and when the liquid level is lower than a first predetermined level, the float moves to a lower position, thereby closing the outlet pipe.

[0128] In one embodiment, the gas outlet further defines a gas outlet opening, and wherein when the liquid level is at a second predetermined level, the outlet closure body moves to an upper position, thereby closing the gas outlet opening.

[0129] In the implementation, the gas outlet further includes an overflow valve, and the overflow valve closes the gas outlet opening when the liquid level is at a second predetermined level.

[0130] In one embodiment, the float includes a protrusion, the external dimensions of which substantially match the internal dimensions of the outlet tube, and wherein during step b), the protrusion is pressed into the outlet tube.

[0131] In this implementation, the float includes a backflow preventer. When the external pressure exceeds the pressure inside the degassing housing, the backflow preventer prevents gas from flowing into the degassing zone. Specifically, the backflow preventer prevents gas from flowing into the degassing zone during step c).

[0132] In one embodiment, the float includes a second protrusion, the external dimensions of which substantially match the internal dimensions of the gas outlet opening, and wherein the protrusion is pressed into the outlet pipe when the liquid level is at a second predetermined level.

[0133] In this implementation, the main flow channel is narrowed between the first and second sides, and the narrowing increases the pressure near the branch flow paths, forcing at least a portion of the main flow into the degassing housing. The main flow channel may also include a branch separator that allows at least a portion of the main flow to branch into the degassing zone. The main flow channel may also include a main flow valve configured to allow a portion of the main flow to branch into the degassing zone. Doing so increases the turnover of liquid in the degassing zone.

[0134] In the implementation, prior to step d), the pressure in the degassing zone is increased to the pressure present essentially during step a). This reduces the pressure differential between the main flow channel and the degassing housing, and / or the pressure differential between the outside and the degassing housing. This facilitates the operation of the gas outlet and valves configured to close branch flow paths, as well as valves configured to close return flow paths.

[0135] In one embodiment, the degassing device further includes a bias switch, and a piston actuator is secured to the degassing housing via one or more resilient members, and the piston actuator is resiliently movable between a first actuator position and a second actuator position. When the force required to move the piston to the retracted position exceeds a predetermined value corresponding to a minimum pressure inside the degassing housing, the force moves the actuator from the first actuator position engaging the bias switch to the second actuator position disengaging the switch, wherein disengagement of the switch interrupts operation of the differential pressure device. In doing so, for example, it can be ensured that a predetermined minimum pressure or maximum underpressure is maintained above the vapor line of the liquid, thereby preventing the liquid from boiling.

[0136] In one embodiment, the degassing housing further includes first and second abutments, and a piston actuator is secured to the degassing housing via one or more resilient members, and the piston actuator is resiliently movable between a first actuator position and a second actuator position. Here, when the piston extends against the first abutment, the piston actuator moves to the first actuator position, and when the piston retracts against the second abutment, the piston moves to the second actuator position.

[0137] In one embodiment, the degassing device further includes a directional switch that operates the piston actuator in a first switch position along a first direction and in a second switch position along a second direction. Here, movement from the first actuator position to the second actuator position causes the directional switch to move from the first switch position to the second switch position, and vice versa.

[0138] In doing so, a system capable of continuous operation without the need for a complex control system is obtained. When the piston has reached the base, the piston actuator automatically changes direction, thereby moving the piston to another base, and so on.

[0139] In this implementation, the directional switch includes a delay component. Here, the delay component delays the operation of the piston actuator when the switch position changes.

[0140] This creates idle periods during which the piston does not move and liquid can flow into the degassing zone, or the liquid in the degassing zone remains stationary. This can improve system performance.

[0141] In one embodiment, the degassing device further includes at least one sensor and a control unit, wherein the control unit reads data from at least one sensor and / or controls a pressure-reducing device. In doing so, the pressure inside the degassing housing can be monitored and controlled if necessary.

[0142] In this implementation, the sensor is a force sensor connected to the piston actuator and the degassing housing, wherein the sensor measures the force acting on the piston actuator in a direction substantially parallel to the central axis of the cylinder. By connecting the force sensor to the piston actuator, the force acting on the piston actuator can be determined and can be used to determine the pressure in the degassing housing.

[0143] In this implementation, a first pressure sensor is located in the main flow channel, and a second pressure sensor is located in the degassing zone. Here, the first and second pressure sensors measure the first and second pressures, respectively.

[0144] In this implementation, the degassing device further includes a temperature sensor. The temperature sensor may be located in the main flow channel. The temperature sensor measures the temperature of the liquid in the main flow channel, and the control unit reads the temperature sensor readings and controls the pressure reduction device.

[0145] In the implementation scheme, the control unit further operates at least one of the first valve, the second valve, the main flow valve, and the gas outlet valve.

[0146] In the implementation, the device further includes a flow switch that prevents the pressure reducing device from operating when there is no flow in the main flow channel. This prevents the device from operating when the liquid in the degassing zone is not being renewed between cycles.

[0147] In another aspect, the present invention relates to a method for testing a degassing apparatus for degassing a liquid containing gas in a cooling or heating device, the degassing apparatus comprising:

[0148] - Mainstream channel, through which the main fluid flow passes.

[0149] - At least one flow path extending between the main flow path and the degassing zone.

[0150] - A degassing shell that defines an internal volume, wherein the internal volume substantially corresponds to the degassing zone.

[0151] - At least one valve that is movable between a closed position and an open position.

[0152] - A pressure reducing device, which is connected to the degassing housing.

[0153] - A pressure sensor configured to measure the pressure in the degassing zone.

[0154] - A gas outlet, located within the degassing housing, comprises an outlet pipe and an outlet closure body, wherein the outlet pipe can be closed by the outlet closure body.

[0155] - A control unit, comprising a first and / or second test module, connected to a pressure sensor and configured to receive a differential pressure signal from the pressure sensor.

[0156] The method includes the following steps:

[0157] a) Close at least one valve and use a pressure sensor to measure the first pressure in the degassing housing.

[0158] b) After a period of time, the second pressure in the degassing shell is measured using a pressure sensor.

[0159] c) The control unit compares the second pressure with the first pressure to determine the difference.

[0160] When there is a difference between the first pressure and the second pressure, the control unit generates a difference signal.

[0161] By utilizing such a first and / or second test module, the degassing device can be tested to ensure its proper operation and enable timely maintenance.

[0162] In the implementation scheme, step a) includes the following sequential steps:

[0163] a1) Close at least one valve.

[0164] a2) Operate the pressure reducing device to reduce or increase the pressure inside the degassing housing.

[0165] a3) Measure the first pressure.

[0166] Here, the difference between the first pressure and the second pressure indicates that when there is a leak in the degassing housing, the differential signal generated by the control unit allows liquid and / or gas to escape from the degassing housing.

[0167] A very small difference signal will indicate a very small, perhaps insignificant, leak, while a larger difference signal will indicate a larger, more significant leak. If this test procedure is performed during maintenance, the operator can judge the difference signal to determine whether action should be taken. This can also be done autonomously by the control unit.

[0168] In the implementation scheme, in step a2), the pressure is reduced to below atmospheric pressure, and if the second pressure is higher than the first pressure and lower than or equal to atmospheric pressure, a differential signal indicating that air is leaking from the outside into the degassing housing is generated.

[0169] In the implementation scheme, in step a2), the pressure is reduced to above atmospheric pressure but below the pressure in the main channel, and if the second pressure is lower than the first pressure, a differential signal indicating leakage from the inside of the degassing housing to the outside is generated.

[0170] In the implementation scheme, in step a2), the pressure is reduced to above atmospheric pressure but below the pressure in the main channel, and if the second pressure is higher than the first pressure, a differential signal indicating leakage from the main channel into the degassing housing is generated.

[0171] In the implementation scheme, the control unit controls the pressure reducing device to maintain the second pressure substantially equal to the first pressure, and if the pressure reducing device operates after the first measured pressure is measured, a differential signal indicating a leak is generated.

[0172] By measuring the pressure in the degassing zone, comparing the measured pressure with the target pressure, and operating the pressure-reducing device, the pressure in the degassing zone is kept constant or substantially constant during the test period, thereby maintaining the pressure in the degassing zone at the target pressure. Leakage can also be tested. The test module measures the operating parameters of the pressure-reducing device in a timely manner and is configured to generate a differential signal indicating leakage when the measured operating parameters exceed a predetermined threshold, wherein the operating parameters are, in particular, cylinder movement and / or the power consumption of the pressure-reducing device.

[0173] Alternatively or additionally, the first test module is configured to keep the piston position constant or substantially constant during the test period. Here, the first test module measures the pressure in the degassing zone during the test period and is configured to generate a differential signal indicating leakage when the pressure difference measured over time exceeds a predetermined threshold.

[0174] In the implementation scheme, in step a2), the pressure is reduced to below atmospheric pressure, and if the pressure reducing device is operated to reduce the pressure, a differential signal is generated indicating that air is leaking from the outside into the degassing housing or from the main channel into the degassing zone.

[0175] In the implementation scheme, in step a2), the pressure is reduced to above atmospheric pressure but below the pressure in the main channel, and if the pressure reducing device is operated to increase the pressure, a differential signal indicating leakage from the inside of the degassing housing to the outside is generated.

[0176] In the implementation scheme, in step a2), the pressure is reduced to above atmospheric pressure but below the pressure in the main channel, and if the pressure reducing device is operated to reduce the pressure, a differential signal indicating leakage from the main channel into the degassing housing is generated.

[0177] In one embodiment, the device includes at least two flow paths, one being a branch flow path and the other a return flow path, and at least one valve is located in at least one of the at least two flow paths. Here, during step a), after measuring the first pressure, at least one valve is closed, and when the difference is less than a predetermined threshold, a difference signal indicating insufficient flow is generated.

[0178] By determining whether there is flow in the main channel, the control unit can determine whether degassing of the liquid is necessary and / or useful.

[0179] In the implementation scheme, when the difference is greater than a predetermined threshold, the control unit periodically performs a degassing cycle, and when the difference is less than the predetermined threshold, the control unit does not perform any degassing cycle.

[0180] In an embodiment, the device further includes a second valve located in another of the at least two flow paths, and performs any of the methods of claims 59-66 after performing the method of claim 67.

[0181] In the implementation scheme, the method is performed before or during the execution of the method according to any one of claims 40-57.

[0182] In the implementation plan, the method is executed periodically. Attached Figure Description

[0183] Figure 1 An implementation scheme for a degassing device in an idle state is described.

[0184] Figure 2 An implementation scheme for a degassing device in the state of just starting to operate the pressure reducing device is described.

[0185] Figure 3 An implementation scheme for a degassing device under low pressure is described.

[0186] Figure 4 An implementation scheme for a degassing device is described, after the dissolved gas has been separated from the liquid and discharged to the outside of the degassing device.

[0187] Figure 5 An implementation scheme including an idle float chamber, sensors, and a control unit is described.

[0188] Figure 6An implementation scheme including a float chamber under low pressure, sensors, and a control unit is described.

[0189] Figure 7 An implementation scheme including a float chamber under overpressure, sensors, and a control unit is described.

[0190] Figure 8 An implementation scheme for a degassing device is described, wherein the valve is controlled by a control unit that is in an idle state.

[0191] Figure 9 An implementation scheme for a degassing device is described, wherein the valve is controlled by a control unit in a low-pressure state.

[0192] Figure 10 An implementation scheme for a degassing device is described, wherein the valve is controlled by a control unit that is in an idle state.

[0193] Figure 11 An implementation scheme for a degassing device is described, wherein the valve is controlled by a control unit in a low-pressure state.

[0194] Figure 12 An implementation scheme in which the piston movement orthogonal to the main channel is in an idle state is described.

[0195] Figure 13 An implementation scheme in which the piston movement orthogonal to the main channel is in a low-pressure state is described.

[0196] Figure 14A and Figure 14B An implementation scheme for the piston actuator is described.

[0197] Figure 15 An implementation scheme for a degassing device, including a porous chamber and a vacuum pump, is described.

[0198] Figure 16 An implementation scheme with a flow path is described, wherein the degassing device is in an idle pressure position.

[0199] Figure 17 An implementation scheme with a flow path is described, wherein the degassing device is in a low-pressure position.

[0200] Figure 18 An implementation scheme including a test module and an opening valve is described.

[0201] Figure 19 An implementation scheme including a test module and a shut-off valve is described.

[0202] Figure 20 An implementation scheme including a test module and two shut-off valves is described.

[0203] Figure 21 An implementation scheme where no flow exists is described.

[0204] Figure 22A , Figure 22B , Figure 22C and Figure 22D The pressure was described as varying with the operation of the pressure-reducing device and over time.

[0205] Figure 23A and Figure 23B The pressure changes as the pressure-reducing device operates and over time are described respectively.

[0206] Figure 24A and Figure 24B The pressure changes as the pressure-reducing device operates and over time are described respectively.

[0207] Figure 25A and Figure 25B An implementation scheme for a degassing device, including a cup body and a cover body, is described.

[0208] Figure 26A and Figure 26B An implementation scheme for a degassing device, including a cup body and a cover body, is described.

[0209] Figure 27A and Figure 27B An implementation scheme including a directional switch and a conduit is described.

[0210] Figure 28A and Figure 28B A close-up of the decompression device in two positions is depicted.

[0211] Figure 29A and Figure 29B An implementation scheme including mobile switches located in different positions is described.

[0212] Figures 30A and 30B depict an embodiment including the actuator end. Detailed Implementation

[0213] Go to Figures 1-4The figures depict cross-sections of an embodiment of the degassing device 10. These figures depict a degassing cycle in which a certain amount of liquid is separated from the main flow channel, the liquid is degassed by depressurization, gas is discharged, and the liquid remains in communication with the main flow channel. After this cycle is completed, a new cycle begins. The degassing device 10 is connected to a liquid circuit of a cooling or heating device (not shown), wherein liquid from the cooling or heating device enters the degassing device 10 at a first side 22 and exits at a second side 24. During operation, the main portion of the liquid flow passes through the main flow channel 20, and a branch is branched by a branch flow path 30. After being branched, the liquid flow enters the degassing zone 42, where the liquid will be degassed, through the branch flow path. The degassing zone 42 substantially corresponds to the internal volume of the degassing housing 40. In the idle state of the degassing device, the liquid first passes through the branch flow path 30 and the degassing zone 42, and then the liquid merges with the main flow via a return flow path 50 extending between the degassing zone and the main flow channel.

[0214] The pressure reducing device 70 is connected to the degassing housing 40 and configured to reduce the pressure in the degassing zone 42 relative to the pressure in the main flow channel. The pressure can be measured using a sensor 92, particularly a pressure gauge.

[0215] In order to degas the liquid in the degassing zone, the degassing housing must be sealed from the outside, i.e., from the atmosphere outside the degassing device and from the main flow channel. For this purpose, a valve 60B is present, movable between a closed position 62B and an open position 64B. In the closed position, the valve blocks the return flow path 50 and closes the degassing zone from the main flow channel. Another valve 60A is present and configured to move between a closed position 62B and an open position 64B, and in the closed position blocks the branch flow path, thereby closing the degassing zone 42 from the main flow channel 20.

[0216] After the liquid has been degassed, the separated gas must be discharged from the device. For this purpose, a gas outlet 80 exists in the degassing housing and includes an outlet pipe 82 and an outlet closure body 84.

[0217] In the depicted embodiment, the pressure-reducing device 70 includes a piston 72, a cylinder 74, and a piston actuator 76. The piston actuator 76 is configured to move the piston 72 between an extended idle pressure position 722 and a retracted low-pressure position 724. Since the cylinder is in open communication with the degassing zone 42, and the degassing zone 42 extends into the cylinder and is larger in the retracted position 725 than in the extended position 723, the movement of the piston from the extended position 722 to the retracted position 724 reduces the pressure inside the degassing zone 42; the enclosed degassing zone becomes larger in size while the amount of substance inside remains substantially unchanged. The degassing zone 42 is defined by a degassing housing 40, a portion of the outer surface of the piston 72, and a portion of the inner surface of the cylinder 74. It will be understood that if the piston actuator is located on the opposite side of the piston 72 along the direction of piston movement, then since the piston actuator will push rather than pull, the low-pressure position will correspond to the extended position and the idle pressure position will correspond to the retracted position. The piston actuator 76 can be one of an electric actuator, a pneumatic actuator, and a hydraulic actuator. The depicted piston movement is linear.

[0218] To increase the size of the degassing zone, piston 72 includes two O-ring seals 726 that allow the piston to move within the cylinder and maintain a substantially liquid-tight connection between the piston and cylinder 74.

[0219] exist Figures 1-4 In this design, the pressure reducing device is located at the bottom of the degassing housing and is configured to operate below the liquid level in the degassing housing. This, along with the direction 1 which is substantially parallel to the piston movement, makes the degassing device compact and does not occupy a large amount of space away from the main flow channel.

[0220] It can be further seen that the branch passage 30 extends through the cylinder 74 between the main passage 20 and the degassing zone 42. Figure 1 The diagram depicts a branch path 32 that extends from the main flow channel through cavity 742 in the cylinder and enters the internal volume of the degassing housing 40 through a branch orifice 744 defined by the cylinder. Furthermore, valve 60A is integrated into the pressure reducing device; piston 72 is movable to a low-pressure position where it blocks the branch flow path. In doing so, the piston is configured to move valve 60A to a closed state when it moves from an idle pressure position to a low-pressure position.

[0221] Observing the upper region of the degassing device 10, the gas outlet 80 is depicted as including a float chamber 86, and the outlet closure body 84 includes a float. Figure 1 In the middle, the float is floating on the liquid at position 846 above. Figure 2In this configuration, a float rests on the liquid at a floating position 842. The float is connected to an overflow valve 85, which closes the overflow valve 85 when the liquid level rises to a specific level (referred to as the overflow threshold level 89), thus preventing further rises in the liquid level (e.g., ...). Figure 1 (As shown). Alternatively, when the liquid level is low, the float will not close the relief valve (as shown). Figure 2 (As shown).

[0222] When the pressure reducing device is operating, the liquid level is at approximately half the overflow threshold level 89 of the float chamber. This is the maximum liquid level allowed by the float. If the liquid level rises above this level, the float closes the overflow valve 85. When the pressure reducing device starts operating, the liquid level drops due to the increase in the volume of the degassing zone. The float 841 then moves to the lower position 844 (as shown). Figure 3 As shown), it engages with outlet pipe 82, which occurs when the liquid level is below a first predetermined liquid level 88. Here, the outlet shut-off body closes the outlet pipe. A shut-off position 881 is then established at the engagement point. This engagement disconnects the cavitation in the gas outlet located above the shut-off position from the degassing zone. Since the shut-off position 881 is below the liquid level, there is little or no air in the degassing zone. Therefore, the overall compressibility of the liquid in the degassing zone is reduced, resulting in better performance of the degassing process.

[0223] To seal the gas outlet, a backflow preventer 852 is present. When the external pressure exceeds the pressure inside the degassing housing, the backflow preventer prevents gas from flowing into the degassing housing from the outside. Figure 4 When the pressure inside the housing increases, the backflow preventer 852 opens, and free gas released from the liquid can be discharged through the gas outlet. In particular, the backflow preventer prevents gas from flowing into the degassing zone during the depressurization step of the degassing method.

[0224] To generate a liquid flow into the degassing zone 42, the main stream includes a constriction section 26 located between the first side 22 and the second side 24. This constriction increases the pressure in the main stream near the branch flow path, thereby forcing a portion of the main stream into the degassing shell.

[0225] In operation, a method for degassing a liquid containing gas in a cooling or heating device using a degassing device 10 includes the following steps:

[0226] a) Through branch path 30, a portion of the main stream branches out.

[0227] b) Move valves 60A and 60B to their respective closed positions 62A and 62B, thereby blocking the branch flow path and the return flow path respectively, closing the degassing zone from the main flow channel, and shutting off the gas outlet 80.

[0228] c) Operate the pressure reducing device to reduce the pressure in the degassing zone relative to the pressure in the main flow channel.

[0229] d) Open the first valve, the second valve, and the gas outlet.

[0230] During step c), the gas dissolved in the liquid is separated from the liquid, and during and / or after step d), the liquid in the degassing shell is returned to the main flow channel through the return path and the separated gas is discharged through the gas outlet.

[0231] Step b) above can be performed by operating the pressure-reducing device in the depicted embodiment. Figure 2 In this process, the movement 721 of piston 72 toward the low-pressure position causes check valve 60B and valve 60A for branch passage 30 to close, and the liquid level drops below a first predetermined level 88, causing the float to close gas outlet pipe 82. When valves 60A, 60B and gas outlet 80 are closed, the operation of the pressure reducing device lowers the pressure in degassing zone 42. Figure 3 The image depicts the end of the movement of piston 72 within cylinder 74 from extended position 722 to retracted position 724 via piston actuator 76. Here, free gas 3 is formed above the liquid in degassing zone 42 by separating from the liquid. When the valve and gas outlet are opened, free gas 3 can be discharged from the degassing device through the gas outlet, and the liquid in degassing zone 42 can return to the mains through the return path. As a result, the liquid level will rise again to the overflow threshold level 89.

[0232] In the depicted implementation, prior to step d), the pressure in the degassing zone is increased to the pressure present essentially during step a), which helps the float disengage from the outlet pipe, resulting in the outlet pipe reopening and the valve opening.

[0233] Go to Figures 5-7 The float chamber 86 of the gas outlet 80 defines a gas outlet opening 862 through which free gas can be discharged. In this embodiment, the float 841 itself includes protrusions 83 located on the lower side 832 of the float. The protrusions 83 located on the lower side 832 of the float have external dimensions that substantially match the internal dimensions of the outlet pipe 82. This improves the closure of the degassing zone from the outside because the protrusions 83 are pressed into the outlet pipe 82 during the operation in step b). By directly closing the outlet pipe when the liquid level has sufficiently decreased, the amount of free gas in the degassing zone is reduced, thereby enabling faster depressurization. Since the protrusions seal the outlet pipe, a backflow preventer is not required. However, the protrusions and backflow preventers can also be combined.

[0234] The float is configured to actuate the relief valve 85; when the liquid level is at the overflow threshold level (also the second predetermined level) 89, the float 841 moves to the upper position 846, where it closes the relief valve, thereby sealing the gas outlet opening. This occurs when too much liquid begins to accumulate inside the degassing zone and there is a risk of overflow; the float 841, together with the float chamber 86, prevents overflow. Here, the pressure inside the degassing housing is overpressured relative to the outside. This pressure can be equal to the system pressure, i.e., the pressure in the main flow channel.

[0235] To improve closure, the protrusion includes an O-ring or double-lip seal to better seal the gas outlet opening 862 and the gas outlet pipe 82. The O-ring or double-lip seal defines the closed position.

[0236] In addition, cylinder 74 includes a flared end, wherein when the piston is in the idle pressure position 722, a branch passage extends between piston 72 and cylinder 74.

[0237] The degassing device also includes three sensors 92A, 92B, and 92C, and a control unit 90 configured to read the sensors and control the piston actuator 76. By measuring the pressure in the degassing zone with sensor 92A and the pressure in the main flow channel 20 with sensor 92B, the control unit 90 can determine the pressure difference, and the piston actuator 76 can operate based on these measurements. Additionally, the temperature sensor 92C can be used to determine the liquid temperature. By determining the liquid temperature, the pressure at which the liquid begins to boil can be determined and prevented. The temperature sensor can also measure the temperature of the liquid in the main flow channel; the control unit reads the temperature sensor data and can subsequently control the pressure reducing device.

[0238] In addition to using individual sensors 92A, 92B, and 92C to determine the state of the degassing device and, more specifically, the pressure in the degassing zone 42, the control unit 90 can also be configured to measure the current required to move the piston 72. Based on the current, the force acting on the piston can be determined, providing a metric for the pressure in the degassing zone 42.

[0239] exist Figure 7 The image depicts an embodiment of the invention, wherein the main channel does not include a contraction, but includes a branch separator 28 protruding into the main channel. The branch separator is configured to branch a portion of the main channel into a degassing zone.

[0240] Go to Figure 8 and Figure 9The illustration shows an embodiment where the pressure reducing device 70 is not integrated with the valve 60A that closes the branch passage 30. Instead, the branch passage can be closed by actuating valve 60A, which can be moved from an open position 64A to a closed position 62A by control unit 90. Similarly, control unit 90 can also control mains valve 27, which is configured to temporarily close mains passage 20 to branch liquid into the degassing housing.

[0241] Figure 10 and Figure 11 The implementation plan described in the document and Figure 8 and Figure 9 The implementation schemes depicted are essentially similar. The main difference lies in the outlet shut-off body, which includes a gas outlet valve 87 (particularly a ball valve) controllable by the control unit 90. The gas outlet valve allows gas and / or liquid to flow between the outside and the degassing zone in the open position and closes the degassing zone in the closed position. Shortly after the start of operation of the degassing cycle and pressure reducing device 70, the gas outlet valve is closed. At this time, the liquid level is at the overflow threshold level and the outlet valve 87 is submerged. Because the outlet valve 87 is submerged at the start of the pressure reducing step, the entire degassing zone 42 is filled with liquid, and liquid degassing can be performed more efficiently compared to situations where more liquid and / or more gas would initially be present in the internal volume.

[0242] Go to Figure 12 and Figure 13 The illustration depicts an embodiment in which the piston is movable in a direction 2 substantially orthogonal to the main flow channel. By orienting the depressurization device 70 in this way, the degassing device occupies less lateral space and can be used in confined spaces. Here, the cylinder 74 includes a flared end, wherein when the piston is in the idle pressure position 722, a branch flow path extends between the piston 72 and the cylinder 74.

[0243] Furthermore, the piston actuator 76 is secured to the housing via two elastic members 762. In addition to damping vibrations, the elastic members allow the piston actuator 76 to move elastically between a first actuator position 764 and a second actuator position 766. Figure 10In the diagram, the piston actuator is shown in the first actuator position 764, in which the piston actuator engages the bias switch 75 located above the piston actuator. When the pressure reducing device operates and the pressure inside the degassing zone 42 is reduced, the piston, along with the piston actuator 76, is pulled away from the switch. When a predetermined minimum pressure is reached, for example, just above the vapor line of the liquid, the piston actuator moves to the second actuator position 766, thereby disengaging from the bias switch 75. Thus, in operation, when the force required to move the piston to the retracted position 724 exceeds a predetermined value corresponding to the pressure inside the degassing housing, this force moves the piston actuator 76 away from the switch 75, where the disengagement of the switch interrupts the operation of the differential pressure device. In addition to the mechanical method using the switch, it should be understood that a stress gauge or strain gauge combined with the control unit 90 can achieve the same result; the pressure in the degassing zone can then be determined by the control unit using the measured stress or strain values.

[0244] Go to Figure 14A and Figure 14B An embodiment of a piston actuator 76 is depicted, wherein the piston actuator includes an electromagnet 71 configured to attract and / or repel a piston 72. By attracting the piston 72 at an idle pressure position 722, the piston 72 moves to a low pressure position 724. In the depicted embodiment, the piston actuator further includes a spring 77 configured to move the piston back to the idle pressure position 722. This action can also be accomplished by the repulsive force of the magnet 71.

[0245] Go to Figure 15 A schematic depiction of the embodiment is shown. Here, the pressure reducing device is a vacuum pump 78 connected to the gas outlet 80, wherein the outlet closure body includes a gas outlet valve 87 and a gas outlet pipe 82. Furthermore, the degassing device includes a porous chamber 44 located within the volume of the degassing housing 40.

[0246] When the first valve 60A opens, a portion of the main flow is branched by the branch passage 30 and flows into the porous chamber 44. When the first valve 60A and the second valve 60B close, the vacuum pump operates and the pressure inside the degassing housing is reduced. This causes the gas dissolved in the liquid to separate from the liquid, and the gas can then be drawn in through the porous element 442 of the porous chamber and discharged by the vacuum pump. Since the porous chamber 42 is only permeable to gas and impermeable to liquid, the liquid remains in the circuit. After the separated gas is discharged, valves 60A and 60B open and the liquid returns to the main flow channel via the return passage.

[0247] Go to Figure 16 and Figure 17 Depicting with Figure 8 and Figure 9The implementation scheme is similar to that described above. The main difference lies in the presence of a flow path 15 that allows communication between the degassing zone and the main flow channel 20. In the depicted implementation, the degassing zone 42 is filled with liquid from the main flow channel 20. Subsequently, at least one valve 60 moves from the open position 64 to the closed position 62, and the pressure reducing device operates. Afterward, when the liquid has been degassed, the valve moves to the open position 64, and the liquid returns to the main flow channel 20 through the flow path 15. This occurs at the end of the degassing cycle. By utilizing a single valve 60, the device can remain smaller and easier to operate compared to devices utilizing multiple valves.

[0248] exist Figure 18 , Figure 19 , Figure 20 and Figure 21 In the middle, it is described as being related to Figure 12 and Figure 13 Similar to the device. Here, in the main flow channel 20, the contraction section 26 includes a check valve 60C. The first valve 60A and the second valve 60B are also check valves. In order to allow liquid to flow through the first valve 60A, the piston 72 includes an actuator end 728 configured to move the first valve to the open position 64 when the piston is in the extended state 722.

[0249] The piston includes an actuator end 728, and the first valve is a check valve. Here, the actuator end engages the first valve in the open position, wherein movement of the piston from the retracted state to the extended state moves the first valve from the idle closed position to the open position via the actuator end. Movement of the piston from the extended state to the retracted state moves the first valve from the open position to the idle closed position via the actuator end.

[0250] Here, the control unit 90 includes a first and / or a second test module 91, which may include digital or analog components. The test module is configured to determine the presence of flow in the main channel so as not to perform the degassing operation ineffectively.

[0251] exist Figure 18 In the test module, pressure sensor 92A is read to determine the pressure inside the degassing zone. Since valves 60A, 60B, and 60C are all open, this pressure is similar to the pressure in the mains channel. The test module then... Figure 19 After the actuator end 728 closes the first valve 60A, the flow in the main channel, which is still flowing out of the second valve 60B, causes a pressure drop in the degassing zone.

[0252] Because the pressure in the degassing zone is low and the second valve is a check valve, the second valve 60B moves to the closed state 62B. This is in Figure 20 As shown in the diagram. After a period of time, the test module 91 reads the pressure sensor 90A for the second time.

[0253] Then, test module 91 compares the second measured pressure with the first measured pressure to determine the difference. The difference is then compared to a threshold. Because of the flow, the difference is greater than the threshold, and the test module does not generate a difference signal.

[0254] Go to Figure 21 The same test module performed the same as Figure 18 and Figure 19 The same continuous events occurred. However, since there was no flow in the main stream, no pressure drop occurred after closing the first valve 60A. When the test module compared the second measured pressure with the first measured pressure, the difference was very small. Because the difference was less than a threshold, the test module generated a difference signal indicating insufficient flow.

[0255] Here, when the difference is greater than the threshold, the control unit periodically performs a degassing cycle, and when the difference is less than the threshold, the control unit does not perform any degassing cycle.

[0256] Go to Figures 22A-24B The results of another test module are described for different scenarios. Here, test module 91 closes at least one valve and then operates a pressure reducing device to lower the pressure. Subsequently, at least one pressure sensor is read, and after a period of time, the at least one pressure sensor is read a second time. The second measured pressure 9 is then compared with the first measured pressure 7 to determine the difference, and the test module generates a difference signal. It should be understood that the pressure reducing device can also be used to increase the pressure of the test procedure.

[0257] exist Figure 22A , Figure 23A and Figure 24A In this process, the test module performs additional steps. Here, the test module is configured to maintain the pressure in the degassing zone at a constant or substantially constant pressure during the test period by measuring the pressure in the degassing zone, comparing the measured pressure with the target pressure, and operating the pressure reducing device, thereby maintaining the pressure in the degassing zone at the target pressure.

[0258] The test module then measures the operating parameters of the pressure reducing device in a timely manner and is configured to generate a differential signal indicating leakage when the measured operating parameters exceed a predetermined threshold, wherein the operating parameters are in particular the movement of the cylinder and / or the power consumption of the pressure reducing device.

[0259] exist Figure 22A and Figure 22B In both graphs, air leakage into the degassing housing is observed. Figure 22ADuring the process, the pressure drops below atmospheric pressure (8), and a first pressure (7) is measured. Afterward, the piston moves to its retracted state over time (2). This means the pressure-reducing device operates to lower the pressure, but the pressure remains constant. This is only possible if there is a leak from the outside of the degassing housing inward. Based on the presence of a leak, a differential signal is generated.

[0260] exist Figure 22C There is no leakage. Here, the pressure is reduced to below atmospheric pressure (8), and a first pressure (7) is measured. Subsequently, the piston does not need to move to maintain the first pressure, and the piston remains in a constant position.

[0261] exist Figure 22B In this system, the pressure-reducing device operates to lower the pressure to below atmospheric pressure and then stops operating. If there is no leakage, the pressure will remain constant over time. However, if a leakage occurs, the pressure will rise. If the pressure rises to atmospheric pressure and does not rise further, there is a leakage from the outside into the degassing zone. Based on the presence of a leakage, a differential signal is generated indicating that air is leaking from the outside into the degassing housing. If the pressure rises further above atmospheric pressure, there is a leakage between the degassing zone and the mains channel. This is also described in... Figure 23B middle.

[0262] exist Figure 22D There was no leakage. Here, the pressure was reduced to below atmospheric pressure (8), and a first pressure (7) was measured. Subsequently, after a period of time, a second pressure (9) was measured. Since the first and second pressures were essentially the same, it can be inferred that there was no leakage.

[0263] exist Figure 23A and Figure 23B In both graphs, the leakage from the main channel into the degassing zone is shown. Figure 23A In this case, the pressure drops to above atmospheric pressure but below the pressure in the main flow channel 4. If the pressure reducing device must operate to lower the pressure, then leakage occurs from the main flow channel into the degassing zone. Accordingly, a differential signal indicating leakage from the main flow channel into the degassing housing is generated.

[0264] exist Figure 23B The same leakage exists. First, the pressure is reduced by operating the pressure reducing device, and then the pressure reducing device is stopped. If there is no leakage, the pressure will remain constant. However, the pressure rises towards the main flow channel 4. This indicates leakage from the main flow channel into the degassing zone. Accordingly, a differential signal indicating leakage from the main flow channel into the degassing shell is generated.

[0265] Go to Figure 24A and Figure 24B Both graphs show leakage from the degassing zone to the outside. Figure 24AIn the process, the pressure is reduced by a pressure-reducing device. If there is no leakage, the pressure will remain constant without moving the piston. However, because liquid leaks to the outside and because the pressure in degassing zone 6 is higher than atmospheric pressure, the pressure-reducing device operates to increase the pressure to maintain a constant pressure. This indicates leakage from the degassing zone to the outside. Accordingly, a differential signal indicating leakage from the inside of the degassing housing to the outside is generated.

[0266] exist Figure 24B In the process, the pressure is reduced by a pressure-reducing device, and then the pressure-reducing device is stopped. If there is no leakage, the pressure will remain constant. However, because liquid leaks from inside the degassing zone to the outside, the pressure in degassing zone 6 decreases towards atmospheric pressure over time.

[0267] It should be understood that each test module can be used after the others, and can also be tested before the degassing method is executed. Furthermore, it should be understood that these methods can be executed periodically to maintain the degassing device.

[0268] Go to Figure 25A , Figure 25B , Figure 26A and Figure 26B The main flow channel 20 is defined by a cup body 100 and a cover 110. The cup body 100 includes an inlet 102 and an outlet 104. A plate 112 protrudes downward from the cover 110, dividing the cup body into an inlet side 106 and an outlet side 108, and allowing fluid communication from the inlet side to the outlet side only through a constriction 26. The cover 110 separates the main flow channel 20 from the degassing zone 42 and includes two valves 60A and 60B located in the branch flow path and the return flow path, respectively. The degassing housing includes a shroud 120 placed on top of the cover. A seal 122 is provided to prevent leakage between the cover, the shroud, and the cup body. Furthermore, a mounting bracket 124 is provided, to which the cup body 100, the shroud 120, and the pressure reducing device 70 are connected. This mounting bracket can be used to mount the degassing device to a wall or other structure.

[0269] exist Figure 27A , Figure 27B , Figure 28A and Figure 28BIn this design, the degassing device includes a first base 731 and a second base 732. These bases can be used for the piston 72 to abut. Furthermore, the piston actuator 76 is fixed to the degassing housing via two elastic members 762, one located near the directional switch 733 and the other around the cylinder 74. These elastic members 762 allow the piston actuator to move, and when the piston 72 abuts against the first or second bases 731, 732, the piston actuator itself moves relative to the degassing housing to either a first actuator position 764 or a second actuator position 766. In the figures, the extension of the piston abutting against the first base 731 moves the piston actuator to the first actuator position 764, and the retraction against the second base 732 moves the piston actuator to the second actuator position 766.

[0270] The direction switch 733 operates the piston actuator in a first direction when it is in the first switch position 734 and in a second switch position 735 in a second direction. For example... Figure 28A and Figure 28B As depicted, movement from the first actuator position 764 to the second actuator position 766 causes the directional switch to move from the first switch position 734 to the second switch position 735, and vice versa. Upon reaching the base, the switch lever 736 of the directional switch engages the switch holder 737. Movement of the piston actuator then pushes or pulls the switch lever 736 against the switch holder 737, resulting in a change of direction. This causes the piston to move back and forth automatically during operation of the piston actuator 76, and causes the degassing device to automatically begin a new degassing cycle when the previous cycle has been completed. The directional switch may include a delay component that delays the operation of the piston actuator for a predetermined period of time when the switch position changes. In this way, the piston remains idle in the extreme position for a predetermined period of time before it begins to move in the opposite direction.

[0271] To change the shape of the space occupied by the degassing unit, various components can be connected via pipes. Figure 27A In this configuration, the pressure reducing device is connected to the main flow channel via pipe 206. Furthermore, the degassing zone 42 is connected to the main flow channel via pipe 204. Additionally, in... Figure 27B In this configuration, the pressure reducing device is connected to the degassing zone via pipe 202. In this way, one component is subdivided into two smaller components. This implementation has been found useful for underfloor heating systems where there is typically limited available space for relatively large components. The two smaller components are easier to assemble into the underfloor heating system.

[0272] exist Figure 29A and Figure 29B In the middle, it is described as being related to Figure 7 Similar implementation schemes. In Figure 29AIn this device, the flow switch 79 is located in the main flow channel. This flow switch 79 can also function as a contraction section. When there is no flow in the main flow channel, the flow switch will prevent the pressure reducing device from operating. This prevents the degassing device from operating if the liquid in the degassing zone has not been replenished after circulation. Alternatively, the flow switch 79 can also be located in another component of the degassing device. Figure 29B An example is shown, in which the flow switch is located in the branch flow path 30.

[0273] In Figures 30A and 30B, the actuator end is configured to move the outlet shut-off body 84, which serves as a check valve, to an open state and from the open state. To this end, when the piston moves to its extended state 722, the actuator end 728 pushes the check valve open, thereby allowing communication between the degassing zone and the outside. When the piston moves to its retracted state 724, the actuator end disengages from the check valve, and the check valve closes, thereby disconnecting the degassing zone from the outside.

[0274] This invention further relates to the following numbered clauses.

[0275] 1. A degassing device (10) for degassing a liquid containing gas in a cooling or heating device, the degassing device comprising:

[0276] - A main flow channel (20), defined by a tube extending between a first side (22) and a second side (24), wherein, in operation, the main fluid flow passes through the main flow channel.

[0277] - At least one flow path (15) extending between the main flow channel and the degassing zone (42), the flow path being configured to allow communication between the degassing zone and the main flow channel.

[0278] - Degassing shell (40), which defines an internal volume, wherein the internal volume substantially corresponds to the degassing zone.

[0279] - At least one valve (60) is movable between a closed position (62) and an open position (64), wherein in the closed position, the valve blocks the flow passage and closes the degassing zone from the main flow passage, wherein in the open position, the valve does not block the flow passage.

[0280] - A pressure reducing device (70) connected to the degassing housing, wherein during operation, the pressure reducing device is configured to reduce the pressure in the degassing zone relative to the pressure in the main flow channel.

[0281] - A gas outlet (80) is located within a degassing housing. The gas outlet includes an outlet pipe (82) and an outlet closure body (84), wherein the outlet pipe can be closed by the outlet closure body.

[0282] The gas outlet and at least one valve are configured to close the degassing housing, and the pressure reducing device is configured to degas the liquid containing gas.

[0283] 2. The degassing device according to the foregoing clause, wherein the device includes two flow paths, the first flow path being a branch flow path (30) configured to branch a tributary that is part of the main flow, and the second flow path being a return flow path (50) extending between the degassing zone and the main flow channel, the return flow path being configured to return the return flow to the main flow channel.

[0284] 3. The degassing device according to the foregoing clause, wherein the degassing device includes a first valve (60A) movable between a closed position and an open position, wherein in the closed position, the first valve blocks the branch flow path and closes the degassing zone from the main flow path, wherein in the open position, the first valve does not block the branch flow path, and the degassing device includes a second valve (60B) movable between a closed position and an open position, wherein in the closed position, the first valve blocks the return flow path and closes the degassing zone from the main flow path, and wherein in the open position, the second valve does not block the return flow path.

[0285] 4. The degassing device according to any of the preceding clauses, wherein a pressure reducing device is connected to the degassing housing, and wherein the pressure reducing device includes a piston (72), a cylinder (74), and a piston actuator (766), and wherein the piston is movable between an idle pressure position (722) and a low pressure position (724), and wherein the cylinder is in open communication with the internal volume.

[0286] Specifically, at the low-pressure position of the piston, the degassing zone extends into the cylinder and is larger than at the piston's idle pressure position.

[0287] The degassing zone is defined by at least a portion of the degassing shell, the outer surface of the piston, and / or at least a portion of the inner surface of the cylinder.

[0288] 5. The degassing device according to the foregoing clause, wherein the retracted position (723) of the piston corresponds to the low-pressure position and the extended position (725) of the piston corresponds to the idle pressure position, or

[0289] The piston's extended position corresponds to the low-pressure position, and the piston's retracted position corresponds to the idle pressure position.

[0290] 6. The degassing device according to any one of clauses 4-5, wherein the piston actuator is fixed to the degassing housing via one or more elastic members (762), and wherein the piston actuator is elastically movable between a first actuator position (764) and a second actuator position (766).

[0291] 7. The degassing device according to any one of clauses 4-7, wherein the piston is movable in a direction (1) substantially parallel to the main channel, wherein preferably the main channel is oriented substantially horizontally and in a substantially horizontal direction, or wherein preferably the main channel is oriented substantially vertically and in a substantially vertical direction.

[0292] 8. The degassing device according to any one of clauses 4-8, wherein the piston is movable in a direction (2) substantially orthogonal to the main channel, wherein preferably, the main channel is oriented substantially horizontally and in a direction substantially vertical.

[0293] 9. The degassing device according to any one of clauses 4-9, wherein the piston is in direct contact with the liquid, and preferably, there is no membrane between the piston and the degassing zone.

[0294] 10. The degassing device according to any one of clauses 4-10, wherein the piston includes at least one seal (726), particularly two seals spaced apart from each other, especially O-rings, and more particularly double-lip seals, wherein the seals are configured to minimize the amount of liquid that can flow between the piston and the cylinder.

[0295] 11. The degassing apparatus according to any of the preceding clauses, wherein the pressure reducing device is located at the lower part of the degassing housing, and wherein the pressure reducing device is configured to operate below the liquid level in the degassing housing.

[0296] 12. The degassing device according to any of the preceding clauses, wherein the piston includes an actuator end (728) and the first valve is a check valve, wherein the actuator end is configured to engage the first valve, wherein movement of the piston from a retracted state to an extended state moves the first valve from an idle closed position to an open position via the actuator end, and

[0297] The movement of the piston from the extended state to the retracted state moves the first valve from the open position to the idle closed position via the actuator end.

[0298] 13. The degassing device according to any of the preceding clauses, wherein a branch passage extends through the cylinder between the main passage and the degassing zone, and wherein the piston movement is configured to move the first valve to a closed state.

[0299] 14. The degassing device according to the foregoing clause, wherein the cavity (742) is located in the cylinder and between the main flow passage and the piston, wherein the branch path (32) extends through the cavity, particularly behind the piston and around the piston drive shaft.

[0300] 15. The degassing device according to the foregoing clause, wherein the cylinder defines a branch orifice (744), wherein the branch path extends through the branch passage, through the cavity and through the branch orifice into the internal volume.

[0301] 16. The degassing device according to any of the preceding clauses, wherein the first valve is integrated in the pressure reducing device, particularly in the piston, wherein the piston includes a portion that blocks the branch path at a low pressure position.

[0302] 17. The degassing device according to any of the preceding clauses, wherein the second valve is a check valve.

[0303] 18. The degassing device according to any of the preceding clauses, wherein the gas outlet further includes a float chamber (86), and the outlet closure body includes a float movable between a floating position (842) and a lower position (844), wherein when the liquid level drops below a predetermined liquid level (88), the float engages the end of the outlet pipe in the lower position, thereby closing the outlet pipe.

[0304] 19. The degassing device according to the foregoing clause, wherein the float chamber includes an overflow valve (85) defining a gas outlet opening (862), and wherein when the liquid level is above a second predetermined level (also known as an overflow threshold level) (89), the outlet shut-off body moves to an upper position (846) that closes the overflow valve.

[0305] 20. The degassing device according to any one of clauses 18-19, wherein the float includes a protrusion (83) configured to close the outlet pipe and located on the lower side (832) of the float, and wherein the external dimensions of the protrusion substantially match the internal dimensions of the outlet pipe.

[0306] 21. The degassing device according to any one of clauses 18-20, wherein the overflow valve includes a backflow preventer (852) configured to allow gas to escape but not enter the gas outlet, and in particular, the backflow preventer is a check valve.

[0307] 22. The degassing device according to any one of clauses 18-21, wherein the float includes an O-ring or a double-lip seal to close the outlet pipe in the lower position.

[0308] 23. The degassing device according to any of the preceding clauses, wherein the gas outlet includes a gas outlet valve (87), wherein the gas outlet valve, in an open state, allows gas and / or liquid to flow between the outside and the degassing zone and in a closed state, closes the degassing zone, and in particular, the gas outlet valve is a ball valve.

[0309] 24. The apparatus according to any of the preceding clauses further includes a vacuum pump (78) connected to a gas outlet and a porous chamber (44) located within the internal volume of the degassing housing, wherein a branch passage allows a portion of the main flow to branch into the porous chamber, and a return passage extends between the porous chamber and the main flow channel, wherein the porous chamber includes a porous element (442) that is permeable to gases and impermeable to liquids.

[0310] 25. The degassing device according to any of the preceding clauses, wherein the main flow channel is contracted between a first side and a second side, wherein the contraction (26) is configured to increase the pressure near the branch flow path, thereby forcing a portion of the main flow into the degassing housing, and / or wherein the main flow channel includes a branch separator (28) protruding into the main flow channel, the branch separator being configured to allow a portion of the main flow to branch into the degassing zone, and / or the main flow channel includes a main flow valve (27) configured to allow a portion of the main flow to branch into the degassing zone.

[0311] 26. The degassing device according to the foregoing clause, wherein the contraction section includes a check valve (60C).

[0312] 27. The degassing device according to any of the preceding clauses, further comprising a bias switch (75) configured to interrupt operation of the pressure reducing device, wherein in a first actuator position, the piston actuator engages the bias switch, and in a second actuator position, the switch disengages.

[0313] 28. The degassing device according to any of the preceding clauses, further comprising at least one sensor (92) and a control unit (90) configured to read at least one sensor and / or control a pressure reducing device.

[0314] 29. The degassing device according to the foregoing clause, wherein a first pressure sensor (92A) is located in the main flow channel, and wherein a second pressure sensor (92B) is located in the degassing zone, and wherein the control unit is configured to operate the pressure reducing device according to the output of the first pressure sensor and / or the second pressure sensor.

[0315] 30. The degassing device according to any one of clauses 28-29, wherein at least one sensor is a current measuring device configured to determine the current required to move the piston.

[0316] 31. The degassing apparatus according to any one of clauses 28-30, wherein the pressure reducing device includes a sensor configured to measure the pressure in the degassing zone.

[0317] 32. The degassing apparatus according to any one of clauses 28-31, wherein at least one sensor is a strain gauge or stress gauge, wherein at least one sensor is used to measure strain or stress values ​​for use by the control unit to determine the pressure in the degassing zone.

[0318] 33. The degassing device according to any one of clauses 28-32, further comprising a temperature sensor (92°C), particularly located in the main flow channel, wherein the temperature sensor measures the temperature of the liquid in the main flow channel, and wherein the control unit reads the temperature sensor and controls the depressurization device.

[0319] 34. The degassing device according to any one of clauses 28-33, wherein the control unit is further configured to operate at least one of the first valve, the second valve, and the main flow valve.

[0320] 35. The degassing device according to any of the preceding clauses, wherein the pressure reducing device is located at least partially on the upstream side of the degassing housing, and in particular, the piston actuator is located on the upstream side of the degassing housing.

[0321] 36. The degassing device according to any one of clauses 28-35, comprising at least one pressure sensor (92), wherein the control unit comprises:

[0322] - First test module (91), configured to determine the presence of a leak, the first test module is configured as follows:

[0323] o Close at least one valve,

[0324] oThen operate the pressure reducing device to decrease or increase the pressure, and

[0325] o Then read at least one pressure sensor,

[0326] o Read at least one pressure sensor a second time after a period of time, and

[0327] o compares the second measured pressure with the first measured pressure to determine the difference, wherein a difference signal is generated, and / or

[0328] - The second test module (91) is configured to determine the existence of flow in the mainstream channel. The second test module is configured as follows:

[0329] o Read at least one pressure sensor

[0330] o Then at least one valve is closed.

[0331] o Read at least one pressure sensor a second time after a period of time, and

[0332] The second measured pressure is compared with the first measured pressure to determine the difference, wherein when the difference is less than a threshold, a difference signal indicating insufficient flow is generated.

[0333] 37. The degassing device according to any of the preceding clauses, wherein the first test module is configured to maintain the pressure in the degassing zone at a constant or substantially constant pressure during a test period by measuring the pressure in the degassing zone, comparing the measured pressure with a target pressure, and operating a pressure reducing device, thereby maintaining the pressure in the degassing zone at the target pressure, and wherein the first test module timely measures the operating parameters of the pressure reducing device and is configured to generate a differential signal indicating leakage when the measured operating parameters exceed a predetermined threshold, wherein the operating parameters are, in particular, the position of the piston and / or the power consumption of the pressure reducing device, and / or

[0334] The first test module is configured to keep the piston position constant or substantially constant during the test period, and the first test module measures the pressure in the degassing zone during the test period and is configured to generate a differential signal indicating leakage when the pressure difference measured over time exceeds a predetermined threshold.

[0335] 38. The degassing apparatus according to any of the preceding clauses, wherein the first and / or second test modules determine the difference and;

[0336] When the difference exceeds a threshold, the control unit periodically executes a degassing cycle, and

[0337] When the difference is less than the threshold, the control unit does not perform any degassing cycle.

[0338] 39. The degassing device according to any of the preceding clauses, wherein the main flow channel is defined by a cup body (100) and a cover body (110), the cup body (100) including an inlet (102) and an outlet (104), a plate (112) projecting downward from the cover body (110), wherein the plate divides the cup body into an inlet side (106) and an outlet side (108) and allows fluid communication from the inlet side to the outlet side only through a constriction, and wherein the cover body separates the main flow channel from the degassing zone and includes at least one valve located in at least one flow passage, and wherein the degassing housing includes a shroud (120) placed on top of the cover body.

[0339] 40. A method for degassing a liquid containing gas in a cooling or heating device by means of a degassing device (10), the degassing device comprising:

[0340] - Mainstream channel (20), through which the main liquid flow passes,

[0341] - At least one flow path (15) extends between the main flow path and the degassing zone (42),

[0342] - Degassing shell (40), which defines an internal volume, wherein the internal volume substantially corresponds to the degassing zone.

[0343] - Valve (60), which is movable between a closed position and an open position,

[0344] - Pressure reducing device (70), which is connected to the degassing housing,

[0345] - A gas outlet (80) is located within a degassing housing. The gas outlet includes an outlet pipe (82) and an outlet closure body (84), wherein the outlet pipe can be closed by the outlet closure body.

[0346] The method includes the following steps:

[0347] a) A branch of the main stream is made accessible through at least one flow path.

[0348] b) Move at least one valve to its respective closed position, thereby blocking at least one flow path, closing the degassing zone from the main flow path, and shutting off the gas outlet.

[0349] c) Operate the pressure reducing device to reduce the pressure in the degassing zone relative to the pressure in the main flow channel.

[0350] d) Open at least one valve and gas outlet.

[0351] During step c), the gas dissolved in the liquid is separated from the liquid, and during and / or after step d), the liquid in the degassing shell is returned to the main flow channel through at least one flow path and the separated gas is discharged through the gas outlet.

[0352] 41. The method according to the foregoing method clause, wherein the degassing device includes two flow paths, the first flow path being a branch flow path (30) and the second flow path being a return flow path (50).

[0353] 42. The method according to the foregoing method clause, wherein the pressure reducing device is connected to the degassing housing, and wherein the pressure reducing device includes a piston (72), a cylinder (74) and a piston actuator (76), the cylinder being in open communication with the internal volume, and wherein during step c), the piston moves between an extended position (722) and a retracted position (724).

[0354] The degassing zone is defined by the degassing shell and the piston.

[0355] 43. The method according to the foregoing clause, wherein, when the piston moves from the extended position to the retracted position, the degassing zone expands into the cylinder, and the degassing zone is larger in the retracted position than in the extended position, or

[0356] Specifically, when the piston moves from the retracted position to the extended position, the degassing zone expands into the cylinder, and the degassing zone is larger in the extended position than in the retracted position.

[0357] 44. The method according to any of the preceding method clauses, wherein the branch passage extends through the cylinder between the main passage and the degassing zone, and wherein steps b) and c) occur substantially simultaneously, and wherein the movement of the piston moves at least one valve to the closed position and / or closes the gas outlet.

[0358] 45. The method according to the foregoing clause, wherein the piston includes an actuator end (728) and the first valve is a check valve, wherein when the piston moves to the extended position, the actuator end moves the first valve to the open position, and wherein when the piston moves to the retracted position, the valve is allowed to move to the closed position.

[0359] 46. ​​The method according to any of the preceding method clauses, wherein the outlet shut-off body includes a float, and wherein the float shuts off the gas outlet pipe (82) when the liquid level is below a predetermined level (88).

[0360] 47. The method according to the foregoing clause, wherein the gas outlet further includes an overflow valve (85), and wherein the overflow valve closes the gas outlet opening when the liquid level is at a second predetermined level (also known as an overflow threshold level) (89).

[0361] 48. The method according to any one of clauses 46-47, wherein the float includes a protrusion (83) and the external dimensions of the protrusion substantially match the internal dimensions of the outlet tube, and wherein during step b), the protrusion is pressed into the outlet tube.

[0362] 49. The method according to any one of clauses 46-48, wherein the float includes a backflow preventer (852), wherein the backflow preventer prevents gas from flowing into the degassing zone when the external pressure is greater than the pressure inside the degassing housing, and in particular, the backflow preventer prevents gas from flowing into the degassing zone during step c).

[0363] 50. The method according to any of the preceding method clauses, wherein the main channel is contracted between the first side and the second side, wherein the contraction (26) increases the pressure near the branch passage and forces at least a portion of the main channel into the degassing housing, and / or wherein the main channel includes a branch separator (28) that allows at least a portion of the main channel to branch into the degassing zone, and / or the main channel includes a main channel valve (27) configured to allow a portion of the main channel to branch into the degassing zone.

[0364] 51. The method according to the foregoing clause, wherein, prior to step d), the pressure in the degassing zone is increased to the pressure present substantially during step a).

[0365] 52. The method according to any of the foregoing method clauses, wherein the degassing device further includes a bias switch (75) and a piston actuator is fixed to the degassing housing via one or more resilient members, and wherein the piston actuator is resiliently movable between a first actuator position (764) and a second actuator position (766).

[0366] When the force required to move the piston to the retracted position exceeds a predetermined value corresponding to the minimum pressure inside the degassing housing, the force moves the actuator from a first actuator position engaging the bias switch to a second actuator position disengaging the switch, wherein disengaging the switch interrupts the operation of the differential pressure device.

[0367] 53. The method according to any of the preceding method clauses, wherein the degassing device further includes at least one sensor (92) and a control unit (90), wherein the control unit reads at least one sensor and / or controls the pressure reducing device.

[0368] 54. The method according to the foregoing clause, wherein the sensor is a force sensor connected to the piston actuator and the degassing housing, wherein the sensor measures the force acting on the piston actuator in a direction substantially parallel to the central axis of the cylinder.

[0369] 55. The method according to the foregoing clause, wherein the first pressure sensor (92A) is located in the main flow channel, and wherein the second pressure sensor (92B) is located in the degassing zone, and wherein the first and second pressure sensors measure the first and second pressures, respectively.

[0370] 56. The method according to any one of clauses 53-55, wherein the degassing device further includes a temperature sensor (90°C), specifically, the temperature sensor is located in the main flow channel, wherein the temperature sensor measures the temperature of the liquid in the main flow channel, and wherein the control unit reads the temperature sensor and controls the depressurization device.

[0371] 57. The method according to any one of clauses 53-56, wherein the control unit further operates at least one of the first valve, the second valve, the main flow valve, and the gas outlet valve.

[0372] 58. A method for testing a degassing apparatus (10) for degassing a liquid containing gas in a cooling or heating device, the degassing apparatus comprising:

[0373] - Mainstream channel (20), through which the main liquid flow passes,

[0374] -At least one flow path extending between the main flow path and the degassing zone (42),

[0375] - Degassing shell (40), which defines an internal volume, wherein the internal volume substantially corresponds to the degassing zone.

[0376] - At least one valve (60) that is movable between a closed position and an open position,

[0377] - Pressure reducing device (70), which is connected to the degassing housing,

[0378] - Pressure sensor (92A), configured to measure pressure in the degassing zone,

[0379] - A gas outlet (80) is located within a degassing housing. The gas outlet includes an outlet pipe (82) and an outlet closure body (84), wherein the outlet pipe can be closed by the outlet closure body.

[0380] - A control unit (90) comprising a first and / or second test module, connected to a pressure sensor and configured to receive a differential pressure signal from the pressure sensor.

[0381] The method includes the following steps:

[0382] a) Close at least one valve and use a pressure sensor to measure the first pressure in the degassing housing.

[0383] b) After a period of time, the second pressure in the degassing shell is measured using a pressure sensor.

[0384] c) The control unit compares the second pressure with the first pressure to determine the difference.

[0385] When there is a difference between the first pressure and the second pressure, a difference signal is generated by the control unit.

[0386] 59. The method for testing a degassing device according to the foregoing clause, wherein step a) comprises the following sequential steps:

[0387] a) 1) Close at least one valve.

[0388] a)2) Operate the pressure reducing device to reduce or increase the pressure inside the degassing housing.

[0389] a)3) Measure the first pressure, and wherein the difference between the first pressure and the second pressure indicates a leak in the degassing housing, and a differential signal generated by the control unit allows liquid and / or gas to escape from the degassing housing.

[0390] 60. The method according to the foregoing clause, wherein, in step a2), the pressure is reduced to below atmospheric pressure, and wherein if the second pressure is higher than the first pressure and lower than or equal to atmospheric pressure, a differential signal indicating that air is leaking from the outside into the degassing housing is generated.

[0391] 61. The method according to Clause 59, wherein, in step a2), the pressure is reduced to above atmospheric pressure but below the pressure in the main channel, and wherein if the second pressure is lower than the first pressure, a differential signal indicating leakage from the inside of the degassing housing to the outside is generated.

[0392] 62. The method according to Clause 59, wherein, in step a2), the pressure is reduced to above atmospheric pressure but below the pressure in the main channel, and wherein if the second pressure is higher than the first pressure, a differential signal indicating leakage from the main channel into the degassing housing is generated.

[0393] 63. The method according to Clause 59, wherein the control unit controls the pressure reducing device to maintain the second pressure substantially equal to the first pressure, and wherein if the pressure reducing device is operated after measuring the first measured pressure, a differential signal indicating leakage is generated.

[0394] 64. The method according to the foregoing clause, wherein, in step a2), the pressure is reduced to below atmospheric pressure, and wherein if the pressure reducing device is operated to reduce the pressure, a differential signal is generated indicating that air is leaking from the outside into the degassing housing or from the mains channel into the degassing zone.

[0395] 65. The method according to Clause 63, wherein, in step a2), the pressure is reduced to above atmospheric pressure but below the pressure in the main channel, and wherein if the pressure reducing device is operated to increase the pressure, a differential signal indicating leakage from the inside of the degassing housing to the outside is generated.

[0396] 66. The method according to Clause 63, wherein, in step a2), the pressure is reduced to above atmospheric pressure but below the pressure in the main flow channel, and wherein if the pressure reducing device is operated to reduce the pressure, a differential signal indicating leakage from the main flow channel into the degassing housing is generated.

[0397] 67. The method for testing a degassing device according to Clause 58, wherein the device comprises at least two flow paths, one flow path being a branch flow path and the other a return flow path, and at least one valve is located in at least one of the at least two flow paths.

[0398] During step a), after measuring the first pressure, at least one valve is closed, and a difference signal indicating insufficient flow is generated when the difference is less than a predetermined threshold.

[0399] 68. The method described according to the foregoing clauses, wherein:

[0400] a. When the difference exceeds a predetermined threshold, the control unit periodically executes a degassing cycle, and

[0401] b. When the difference is less than a predetermined threshold, the control unit does not perform any degassing cycle.

[0402] 69. A method for testing a degassing apparatus according to any one of clauses 67-68, wherein the apparatus further includes a second valve located in another of at least two flow paths, and wherein any one of the methods described in clauses 59-66 is performed after the method described in clause 67 is performed.

[0403] 70. A method for testing a degassing apparatus according to any one of clauses 67-69, wherein the method is performed before or during the execution of the method according to any one of clauses 40-57.

[0404] 71. A method for testing a degassing apparatus according to any one of clauses 58-70, wherein the method is performed periodically.

[0405] As used herein, the term "an" or "a" is defined as one or more. As used herein, the term "a plurality of" is defined as two or more. As used herein, the term "another" is defined as at least a second or more. As used herein, the terms "comprising" and / or "having" are defined as encompassing, i.e., open-ended language, not excluding other elements or steps.

[0406] Any reference numerals in the claims should not be construed as limiting the scope of the claims or the invention. It should be understood that the specific embodiments claimed may not achieve all the stated purposes.

[0407] The fact that certain means are described in mutually different dependent claims does not indicate that a combination of these means cannot be advantageous.

[0408] The white lines between paragraphs in the above text indicate that the technical features present in a paragraph can be considered as technical features independent of those discussed in previous or subsequent paragraphs.

Claims

1. A degassing device (10) for degassing a liquid containing gas in a cooling or heating installation, the degassing device comprising: - a main flow channel (20) defined by a tube extending between a first side (22) and a second side (24), wherein in operation a main liquid flow flows through the main flow channel, - at least one flow passage (15) extending between the main flow channel and a degassing zone (42), the flow passage being configured to allow communication between the degassing zone and the main flow channel, - a degassing housing (40) defining an internal volume, wherein the internal volume substantially corresponds to the degassing zone, - at least one valve (60; 60A, 60B) movable between a closed position (62) and an open position (64), wherein in the closed position the valve obstructs the flow passage and closes the degassing zone from the main flow channel, and wherein in the open position the valve does not obstruct the flow passage, - a pressure reduction device (70) connected to the degassing housing, wherein during operation the pressure reduction device is configured to reduce the pressure in the degassing zone relative to the pressure in the main flow channel, - a gas outlet (80) in the degassing housing, the gas outlet comprising: o an outlet tube (82) and an outlet closure body (84), wherein the outlet tube can be closed by the outlet closure body, o a spill valve (85) defining a gas outlet opening (862), wherein the spill valve is connected to a float (841), wherein the float is configured to operate the spill valve to close the gas outlet opening when the liquid level is above a spill threshold level (89), and wherein the spill threshold level (89) is higher than a closed position (881) of the outlet closure body, wherein the degassing device is configured to perform a degassing cycle, the degassing cycle comprising: - a pressure reduction step during which the gas outlet and the at least one valve are closed, wherein the pressure reduction device is configured to degas the liquid containing gas by reducing the pressure, wherein at the start of the pressure reduction step the liquid level in the degassing device is at the spill threshold level and the outlet closure body closes the outlet tube, - a gas discharge step during which the pressure in the degassing zone is increased and the separated gas is discharged through the outlet tube and the gas outlet opening.

2. Degassing device according to the preceding claim, wherein The device comprises two flow passages, a first flow passage being a branch flow passage (30) configured to branch a branch flow being part of the main flow, and a second flow passage being a return flow passage (50) extending between the degassing zone and the main flow channel, the return flow passage being configured to return a return flow to the main flow channel.

3. Degassing device according to the preceding claim, wherein The degassing device comprises a first valve (60A) movable between a closed position and an open position, wherein in the closed position the first valve obstructs the branch flow passage and closes the degassing zone from the main flow channel, and wherein in the open position the first valve does not obstruct the branch flow passage, and wherein the degassing device comprises a second valve (60B) movable between a closed position and an open position, wherein in the closed position the first valve obstructs the return flow passage and closes the degassing zone from the main flow channel, and wherein in the open position the second valve does not obstruct the return flow passage.

4. Degassing device according to any of the preceding claims, wherein The pressure reduction device is connected to the degassing housing, and wherein the pressure reduction device comprises a piston (72), a cylinder (74) and a piston actuator (766), and wherein the piston is movable between an idle pressure position (722) and a low pressure position (724), and wherein the cylinder is in open communication with the inner volume, wherein, in the low pressure position of the piston, the degassing zone extends into the cylinder and is larger than in the idle pressure position of the piston, wherein the degassing zone is defined by the degassing housing, at least a portion of the outer surface of the piston and / or at least a portion of the inner surface of the cylinder.

5. Degassing device according to the preceding claim, wherein The retracted position (723) of the piston corresponds to the low pressure position and the extended position (725) of the piston corresponds to the idle pressure position, or wherein the extended position of the piston corresponds to the low pressure position and the retracted position of the piston corresponds to the idle pressure position.

6. The degassing apparatus of claim 4, wherein, The piston actuator is fixed to the degassing housing via one or more resilient members (762), and wherein the piston actuator is resiliently movable between a first actuator position (764) and a second actuator position (766).

7. Degassing device according to the preceding claim, wherein The degassing housing comprises a first abutment (731) and a second abutment (732), wherein the piston extends against the first abutment to move the piston actuator to the first actuator position, and wherein the piston retracts against the second abutment to move the piston to the second actuator position.

8. Degassing device according to the preceding claim, wherein The degassing device comprises a direction switch (733) configured to operate the piston actuator in a first direction in a first switch position (734) and in a second direction in a second switch position (735), wherein the movement from the first actuator position to the second actuator position moves the direction switch from the first switch position to the second switch position, and vice versa.

9. Degassing device according to the preceding claim, wherein The direction switch comprises a delay component, wherein the delay component is configured to delay the operation of the piston actuator after a change in switch position.

10. The degassing device of claim 4, wherein, The piston is movable in a direction (1) substantially parallel to the main flow passage.

11. The degassing device of claim 4, wherein, The piston is movable in a direction (2) substantially orthogonal to the main flow passage.

12. The degassing device of claim 4, wherein, The piston is in direct contact with the liquid.

13. The degassing device of claim 4, wherein, The piston comprises at least one seal (726), wherein the seal is configured to minimize the amount of liquid that can flow between the piston and the cylinder.

14. The degassing device of claim 1, wherein, The pressure reduction device is located in a lower part of the degassing housing, and wherein the pressure reduction device is configured to operate below the liquid level in the degassing housing.

15. The degassing device of claim 1, wherein, The piston comprises an actuator end (728) and the first valve is a check valve, wherein the actuator end is configured to engage the first valve, wherein the movement of the piston from the retracted state to the extended state moves the first valve from an idle closed position to an open position via the actuator end, and wherein the movement of the piston from the extended state to the retracted state moves the first valve from the open position to the idle closed position via the actuator end.

16. The degassing device of claim 1, wherein, The branch flow passage extends through the cylinder between the main flow passage and the degassing zone, and wherein the piston movement is configured to move the first valve to the closed state.

17. Degassing device according to the preceding claim, wherein A cavity (742) is located in the cylinder and between the main flow passage and the piston, wherein the branch flow path (32) extends through said cavity.

18. Degassing device according to the preceding claim, wherein The cylinder defines a branch flow aperture (744), wherein the branch flow path extends through the branch flow passage, through said cavity and through the branch flow aperture into the inner volume.

19. The degassing device of claim 1, wherein, The first valve is integrated in the pressure reduction device, wherein the piston comprises a portion that blocks the branch path in the low pressure position.

20. The degassing device of claim 1, wherein, The second valve is a check valve.

21. The degassing device of claim 1, wherein, The gas outlet further comprises a float chamber (86) and the outlet closure comprises a float that is movable between a floating position (842) and a lower position (844), wherein the float engages an end of the outlet tube in the lower position when the liquid level falls below a predetermined level (88), thereby closing the outlet tube.

22. Degassing device according to the preceding claim, wherein The float chamber comprises an overflow valve (85) that defines a gas outlet opening (862), and wherein the outlet closure moves to an upper position (846) when the liquid level is above an overflow threshold level (89), thereby closing the overflow valve.

23. The degassing device of claim 1, wherein, The float comprises a protrusion (83) configured to close the outlet tube and located on a lower side (832) of the float, and wherein the outer dimensions of the protrusion substantially match the inner dimensions of the outlet tube.

24. The degassing device of claim 1, wherein, The overflow valve comprises a backflow preventer (852) configured to allow gas to escape but not enter the gas outlet.

25. The degassing device of claim 1, wherein, The float comprises an O-ring or double lip seal to close the outlet tube in the lower position.

26. The degassing device of claim 1, wherein, The outlet closure comprises a gas outlet valve (87), wherein the gas outlet valve in an open state allows gas and / or liquid to flow between the outside and the degassing zone and in a closed position closes the degassing zone.

27. The device of claim 1, further comprising a vacuum pump (78) connected to the gas outlet and a porous chamber (44) located within the internal volume of the degassing housing, wherein the branch passage branches a portion of the main flow into the porous chamber and the backflow passage extends between the porous chamber and the main flow channel, wherein the porous chamber comprises a porous element (442) permeable to gas and impermeable to liquid.

28. The degassing device of claim 1, wherein, The main flow channel is constricted between a first side and a second side, wherein the constriction (26) is configured to increase the pressure in the vicinity of the branch passage, thereby forcing a portion of the main flow into the degassing housing, and / or wherein the main flow channel comprises a branch separator (28) protruding into the main flow channel configured to branch a portion of the main flow into the degassing zone, and / or the main flow channel comprises a main flow valve (27) configured to branch a portion of the main flow into the degassing zone.

29. Degassing device according to the preceding claim, wherein The constriction comprises a check valve (60C).

30. The deaeration device of claim 1, further comprising a bias switch (75) configured to interrupt operation of the pressure reduction device, wherein, In the first actuator position, the piston actuator engages a biasing switch and in the second actuator position, the switch is disengaged.

31. The degassing device of claim 1, further comprising at least one sensor (92) and a control unit (90) configured to read the at least one sensor and / or control the pressure reduction device.

32. Degassing device according to the preceding claim, wherein A first pressure sensor (92A) is located in the main flow channel and wherein a second pressure sensor (92B) is located in the degassing zone, and wherein the control unit is configured to operate the pressure reduction device in dependence of the output of the first pressure sensor and / or the second pressure sensor.

33. The degassing apparatus of claim 31, wherein, The at least one sensor is a current measurement device configured to determine the current required to move the piston.

34. The degassing apparatus of claim 31, wherein, The pressure reduction device comprises a sensor configured to measure the pressure in the degassing zone.

35. The degassing apparatus of claim 31, wherein, The at least one sensor is a strain gauge or stress gauge, wherein the at least one sensor is used to measure a strain value or a stress value for the control unit to determine the pressure in the degassing zone.

36. The degassing device according to claim 31, further comprising a temperature sensor (92C), wherein the temperature sensor measures the temperature of the liquid in the main flow channel, and wherein the control unit reads the temperature sensor and controls the pressure reduction device.

37. The degassing apparatus of claim 31, wherein, The control unit is further configured to operate at least one of the first valve, the second valve and the main flow valve.

38. The degassing apparatus of claim 31, wherein, The device further comprises a flow switch (79), wherein the flow switch prevents the pressure reduction device from operating when there is no flow in the main flow channel.

39. The degassing device of claim 1, wherein, The pressure reduction device is at least partially located at an upstream side of the degassing housing.

40. The degassing device of claim 1, wherein, The main flow channel is defined by a cup (100) comprising an inlet (102) and an outlet (104) and a lid (110), wherein a plate (112) protrudes downwards from the lid, wherein the plate divides the cup into an inlet side (106) and an outlet side (108) and allows fluid communication from the inlet side to the outlet side only through the constriction, and wherein the lid separates the main flow channel from the degassing zone and comprises at least one valve located in the at least one flow passage, and wherein the degassing housing comprises a cover (120) placed on top of the lid.

41. The degassing device of claim 1, wherein, The degassing zone is connected to the pressure reduction device via a conduit (202), and / or wherein the degassing zone and / or the pressure reduction device are connected to the main flow channel via conduits (204, 206).

42. The degassing device of claim 1, wherein, The outlet closing body is a check valve, and the check valve is preferably actuated by an actuator.

43. A method for degassing a liquid containing gas in a cooling or heating installation by utilizing a degassing device (10) comprising: - a main flow channel (20), wherein a main liquid flow flows through the main flow channel, - at least one flow passage (15) extending between the main flow channel and a degassing zone (42), - a degassing housing (40) defining an inner volume, wherein the inner volume substantially corresponds to the degassing zone, - a valve (60) movable between a closed position and an open position, - a pressure reduction device (70) connected to the degassing housing, - a gas outlet (80) in the degassing housing, the gas outlet comprising: o an outlet tube (82) and an outlet closing body (84), wherein the outlet tube can be closed by the outlet closing body, o a spill valve (85) defining a gas outlet opening (862), wherein the spill valve is connected to a float (841), wherein the float is configured to operate the spill valve to close the gas outlet opening when the liquid level is above a spill threshold level (89), and wherein the spill threshold level (89) is higher than a closed position (881) of the outlet closing body, wherein the degassing device is configured to perform a degassing cycle, wherein the method comprises the following steps: a) branching off a part of the main flow through the at least one flow passage, b) moving the at least one valve to a respective closed position, thereby respectively blocking the at least one flow passage, closing the degassing zone from the main flow channel, and closing the gas outlet, c) operating the pressure reduction device to reduce the pressure in the degassing zone relative to the pressure in the main flow channel, d) opening the at least one valve and the gas outlet, wherein the degassing cycle comprises a pressure reduction step comprising steps a), b) and c) and a gas expulsion step comprising step d), wherein, - during the pressure reduction step, the gas outlet and the at least one valve are closed, wherein the pressure reduction device is configured to degas the gas containing liquid by reducing the pressure, wherein at the start of the pressure reduction step, the liquid level in the degassing device is at the overflow threshold level and the outlet closing body closes the outlet pipe in the closed position, - during the gas discharge step, the pressure in the degassing zone is increased and the separated gas is discharged through the outlet pipe and the gas outlet opening.

44. The method according to the preceding method claim, wherein The degassing device comprises two flow passages, a first flow passage is a branch passage (30) and a second flow passage is a return passage (50).

45. The method according to the preceding method claim, wherein The pressure reduction device is connected to the degassing housing and wherein the pressure reduction device comprises a piston (72), a cylinder (74) and a piston actuator (76), the cylinder is in open communication with the inner volume, and wherein during step c) the piston is moved between an extended position (722) and a retracted position (724), wherein the degassing zone is defined by the degassing housing and the piston.

46. The method according to the preceding claim, wherein, When the piston is moved from the extended position to the retracted position, the degassing zone expands into the cylinder and the degassing zone is larger in the retracted position than in the extended position, or wherein when the piston is moved from the retracted position to the extended position, the degassing zone expands into the cylinder and the degassing zone is larger in the extended position than in the retracted position.

47. The method according to any of the preceding method claims, wherein, The branch passage extends through the cylinder between the main flow channel and the degassing zone, and wherein step b) and step c) occur substantially simultaneously, and wherein the movement of the piston moves the at least one valve to the closed position and / or closes the gas outlet.

48. The method according to the preceding claim, wherein, The piston comprises an actuator end (728) and the first valve is a check valve, wherein when the piston is moved to the extended position, the actuator end moves the first valve to the open position, and wherein when the piston is moved to the retracted position, the valve is allowed to move to the closed position.

49. The method of claim 43, wherein, The outlet closing body comprises a float, and wherein when the liquid level is below a predetermined level (88), the float closes the gas outlet pipe (82).

50. The method according to the preceding claim, wherein, The gas outlet further comprises an overflow valve (85), and wherein when the liquid level is at a second predetermined level (89), the overflow valve closes the gas outlet opening.

51. The method of claim 49, wherein, The float comprises a protrusion (83), and the outer dimensions of the protrusion substantially match the inner dimensions of the outlet pipe, and wherein during step b) the protrusion is pressed into the outlet pipe.

52. The method of claim 49, wherein, The float comprises a backflow preventer (852), wherein the backflow preventer prevents gas from flowing into the degassing zone when the external pressure is greater than the pressure inside the degassing housing.

53. The method of claim 43, wherein, The main flow channel is constricted between a first side and a second side, wherein the constriction (26) increases the pressure in the vicinity of the branch passage and forces at least a portion of the main flow into the degassing housing, and / or wherein the main flow channel comprises a branch separator (28) configured to branch at least a portion of the main flow into the degassing zone, and / or the main flow channel comprises a main flow valve (27) configured to branch a portion of the main flow into the degassing zone.

54. The method according to the preceding claim, wherein, Prior to step d), the pressure in the degassing zone is increased to substantially the pressure present during step a).

55. The method of claim 43, wherein, The degassing device further comprises a biasing switch (75) and the piston actuator is fixed to the degassing housing via one or more resilient members, and wherein the piston actuator is resiliently movable between a first actuator position (764) and a second actuator position (766), wherein when the force required to move the piston to the retracted position exceeds a predetermined value corresponding to the minimum pressure inside the degassing housing, the force moves the actuator from the first actuator position engaging the biasing switch to the second actuator position disengaging the switch, wherein disengagement of the switch interrupts operation of the pressure differential device.

56. The method of claim 43, wherein, The degassing housing further comprises a first abutment (731) and a second abutment (732) and the piston actuator is fixed to the degassing housing via one or more resilient members, and wherein the piston actuator is resiliently movable between a first actuator position (764) and a second actuator position (766), wherein when the piston is extended against the first abutment, the piston actuator is moved to the first actuator position, and when the piston is retracted against the second abutment, the piston is moved to the second actuator position.

57. The method according to the preceding claim, wherein, The degassing device comprises a direction switch (733) that operates the piston actuator in a first direction in a first switch position (764) and in a second direction in a second switch position (766), wherein movement from the first actuator position to the second actuator position moves the direction switch from the first switch position to the second switch position and vice versa.

58. The method according to the preceding claim, wherein, The direction switch comprises a delay component, wherein the delay component delays operation of the piston actuator upon change of switch position.

59. The method of claim 43, wherein, The degassing device further comprises at least one sensor (92) and a control unit (90), wherein the control unit reads the at least one sensor and / or controls the pressure reduction device.

60. The method according to the preceding claim, wherein, The sensor is a force sensor connected to the piston actuator and the degassing housing, wherein the sensor measures the force acting on the piston actuator in a direction substantially parallel to the central axis of the cylinder.

61. The method according to the preceding claim, wherein, A first pressure sensor (92A) is located in the main flow channel and wherein a second pressure sensor (92B) is located in the degassing zone, and wherein the first and second pressure sensors measure the first and second pressures, respectively.

62. The method of claim 59, wherein, The degassing device further comprises a temperature sensor (90C), wherein the temperature sensor measures the temperature of the liquid in the main flow channel, and wherein the control unit reads the temperature sensor and controls the pressure reduction device.

63. The method of claim 59, wherein, The control unit further operates at least one of the first valve, the second valve, the main flow valve, and the gas outlet valve.

64. The method of claim 59, wherein, The device further comprises a flow switch, wherein the flow switch prevents the pressure reduction device from operating when there is no flow in the main flow channel.

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