KR20030094321A - Method for feeding a closed liquid system - Google Patents

Abstract

A method for automatically feeding a closed liquid system from a liquid source according to need by creating between the liquid source and the closed liquid system a feed buffer formed from liquid, in which between the liquid source and the feed buffer only liquid flow in the direction of the feed buffers is allowed and from the feed buffer to the closed liquid system only dropwise liquid transport is admitted. The feed buffer can be realized with a cylindrical drip feeder with inlet, outlet and freely movable plunger, which can close the outlet in an abutting position while leaving clear a minuscule leakage channel and is provided with a passage with a non-return valve in the direction of the inlet. Such a drip feeder can, with or without insertion of a storage container for liquid, be connected with, for instance, a liquid system, such as a central heating system with pipe system, boiler and expansion tank.

Description

Method for feeding a closed liquid system

The feeding method as described above is known from WO-A-00 / 19149. In the degassing chamber, liquid accumulation is maintained, especially as required by floating control valves from liquid sources such as PWSs. In this way, any environment should not be able to find a path from the liquid system in which the liquid is supplied from the closed liquid system as the pressure increases in the liquid system or decreases or disappears from the liquid source during the supply. In addition, when an accident such as a pipe rupture of the liquid system occurs, the supply from the liquid source must be at least significantly interrupted so that the accident does not get much worse.

As an example the problems will be discussed in more detail with reference to the central heating system. Closed liquid circulation circuits of varying temperatures and pressures often use expansion tanks to cope with the expansion and reduction of the volume of liquid encased in the event of a temperature change without increasing the pressure. Moreover, in the closed liquid circulation circuit, the loss of liquid in the closed circuit, especially when the central heating equipment is included, can hardly be excluded. Thus, a lot of liquid can leak out of the closed system, where such leaks can be clearly seen and repaired. However, when the amount is small, the location of the leak can be hardly detected or very difficult to detect. Moreover, the amount of leaking liquid is so small that the liquid almost completely evaporates, in which case there is a loss of leakage due to moisture, which is almost impossible to find. When long-term measurements are performed at 40 kW of heating, this undetectable moisture leak loss is about 0.8 cc / 24 h, which is about 300 cc during the heating period.

Known or unknown leaks can be collected to some extent by the expansion tank, which can be considered as a supplement but is a limited or limited supplement. When this replenishment is exhausted, the pressure in the closed liquid circulation circuit can drop rapidly upon further leakage, and the plant will not operate automatically if it falls below a certain pressure, for example when the pressure in the heating system drops to atmospheric pressure. In a central heating system, this results in huge losses, for example, during frosty nights. This can be avoided with a supplementary method known as International Publication No. WO-A-00 / 19149, but this method prevents liquid from flowing back from the closed liquid system to the liquid source, as described above, and for example pipes to the closed liquid system. In the event of a rupture there is a need for certain installations that very reliably prevent liquid from flowing freely in virtually unlimited liquid sources such as PWSs.

The present invention relates to a method for automatically supplying a liquid from a liquid source to a closed liquid system, such as a central heating system or other heat exchange system or processing system, which is a closed liquid circuit, in which the supply formed from the liquid is A buffer is created and a liquid flow is formed between the liquid source and the supply buffer in the direction of the supply buffer. The invention also relates to a drop injector that can be used to make this method and a heating system in which the method and the drop injector are used.

1 is a cross-sectional view of the drop injector.

2 is an enlarged perspective view of FIG. 1.

3 is a schematic diagram of a heating system.

It is an object of the present invention that a closed liquid system is automatically supplied from the liquid source as needed without the risk of finding its path from the liquid system to the liquid source, while the liquid is liquid in the event of an accident in the liquid system. It is to provide a supply method that can not be passed freely from the source to the liquid system.

Another object of the present invention is to provide a method in which a predetermined amount of liquid can be instantaneously supplied to a liquid system.

It is also an object of the present invention to provide a drop injector in which the above-described method can be preferably implemented, which is inherently unlimited from a source of liquid, such as a PWS, without the risk of being discharged without being repelled or suppressed. If necessary, a small amount of liquid leaking from the closed circuit can be automatically replenished.

Another object of the present invention is to automatically maintain under a predetermined pressure using such a drop injector, while a certain limited amount of liquid can be instantaneously ejected to easily detect the leak location when a leak occurs, It is to provide a closed liquid circulation system that is not automatically supplied so that no more water continues to be discharged after the amount of liquid is released.

The present invention in which a liquid supply buffer is created between the liquid source and the closed liquid supply system and liquid droplets can be moved from the liquid supply buffer to the closed liquid system, thereby automatically supplying the liquid supply from the liquid source to the closed liquid system. By the method according to the above, the liquid circuit can be continuously supplied from the liquid source, and at the same time, it is restricted to push the liquid back to the liquid supply buffer, and the liquid backflow to the liquid source is always completely excluded. In addition, although during normal operation the liquid can be freely flowed continuously from the liquid source, for example, if the pressure in the liquid circuit is reduced or dissipated due to, for example, a pipe rupture, it is possible to completely stop the supply, for example through a valve. The liquid can additionally leak out of the liquid source until it reaches time.

Since the supply buffer portion may be open and in communication with the liquid system, the supply buffer portion may form a portion thereof, and in this case, the supply buffer portion may be subjected to pressure fluctuations, and according to another embodiment of the present invention, the supply buffer portion may have a minimum volume. Preferably, this is increased when the pressure of the feed buffer exceeds the pressure of the liquid source. Therefore, there is expansion potential for the supply buffer, and the increase in the volume of the supply buffer is limited by the blowout overpressure protection.

Since droplets can be released by the feed buffer, efficient effluent protection is achieved in practice, but the amount of liquid that can be added to the system per unit time is limited. If it is desired that a large amount of liquid can be delivered to the system in a relatively short time, it can be made according to another embodiment of the invention when a liquid accumulation is created between the supply buffer and the closed liquid system, which liquid Accumulation is supplied via an open connection through the droplet transport from the supply buffer, and via a pluggable passageway to the liquid system, while the opening and closing of the passageway is controlled according to the size created by the closed liquid system.

In order to achieve the invention, a feed buffer is preferably used which is accommodated in a drop injector having a generally cylindrical plunger and a cylindrical housing having an inlet and an outlet installed in the housing so as to be able to move freely, the plunger being a sliding joint. While having a first part fitted to the cylindrical housing and a second part having a smaller diameter than the first part, the outlet can be closed at the joining position, clearly revealing a small leak channel, and housing around the second part. It is provided with a passage that can connect the space in the inlet, and has a non-return valve to prevent the flow from the space to the inlet. Through these means, the drop injector is connected to a liquid source under a certain pressure, such as a PWS, and then driven by the liquid source to the bonding position to allow droplets to pass through the droplets in limited quantities. It is. Thus, the leaking losses into small moisture can be replenished automatically and continuously. In the event of a large accident such as a pipe rupture leading to pressure dissipation at the outlet of the drop injector, the drop injector will nevertheless be exacerbated by continuing to deliver the droplets and continuing to supply a large amount of replenishment. I can't. Conversely, ie when the pressure is higher at the outlet than at the inlet when the pressure is temporarily reduced or dissipated in the replenishment source, the pressure difference between the inlet and outlet increases so much that the plunger is pushed towards the inlet and the micro leak channel Even with this wider open connection, the non-return valve prevents liquid from passing through the valve, making it impossible to find a path through the inlet to the replenishment source.

The implementation of microleakage channels and maintenance of appropriate size and size conditions are followed, in particular, by the way the second part of the plunger interacts with the outlet. In order to optimize this interaction, according to another embodiment of the present invention, the second portion of the plunger extends into a central pin-shaped protrusion which engages and engages with the circumferential groove while slidingly engaging the hole-shaped portion of the outlet. A connecting portion is provided in the second portion, and the circumferential groove is connected to the longitudinal groove extending in the longitudinal direction of the pin-shaped protrusion. By these means accurate guidance of the plunger in the housing and reduction of the outlet to the required size is achieved.

The microleakage channels can be made in a number of ways, for example a very fine groove in the end face of the housing and on the interacting one or both ends of the second part of the plunger. However, according to another embodiment of the present invention, the pin-shaped protrusion is connected to the second part of the plunger by the base and ends at the free end, so that the sealing ring is installed around the base and the free end is adjusted at the joining position of the second part. The adjusting member is movable relative to the pin-shaped protrusion, and can move the plunger through the pin-shaped protrusion in the longitudinal direction when moving. These means achieve a structure in which the degree of leakage and the width of the minute leak channels can be adjusted very precisely. Typically, the sealing ring is pushed into the sealed position against the end wall of the housing by the plunger. However, by means of the adjusting member the plunger can be pushed back, so that the initially flat sealing ring gradually starts to have its rounded shape again. At a given moment, the sealing ring no longer seals completely, but results in the release of a small leak passage. The width of the leak passage obtained by forming the minute leak channel can be precisely controlled by the adjusting member.

As described above, the plunger is pushed to the bonding position by the liquid pressure from the replenishment source while using the drop injector. In order to ensure that the plunger is held at its joint position in the event of a temporary low pressure or pressure drop in the replenishment source, a supplementary force towards the joint position must be applied to the plunger. This can be easily accomplished according to another embodiment of the invention in which the plunger is pushed into the joining position by a spring, which spring is supported on one side to the plunger and the other to the stop connected to be fixed to the housing, More preferably, in this connection the stop can be adjusted relative to the housing.

In a relatively easy way according to another embodiment of the present invention, an annular groove is formed on the outer surface of the second portion of the plunger, which can be a very effective non-return valve, which has a side tip and a bottom, At least one passage communicating with the inlet is opened therein, and is sealed away by a predetermined distance from the bottom by an O-ring in contact with the side tip. Moreover, by additionally providing the side edges of the grooves so that they can be adjusted with respect to each other, the opening pressure of the non-return valve can be optimally adjusted, for example, if the non-return valve is already above the pressure of the space around the second part at the inlet. While opening at a somewhat higher pressure, the non-return valve is still optimally blocked if the pressure in the space exceeds the pressure at the inlet. In addition, if the maximum supply pressure of the liquid added to the liquid circulation system is required to be lower than the inlet pressure, the non-return valve can be adjusted to a high opening pressure.

As already known above, it is required or desirable that government regulations prevent the liquid from being sent to the replenishment from the liquid circulation system, for which the presence of a non-return valve is a very effective means. In a liquid circulation system, for example, if a high pressure is formed in the liquid circulation system such that the plunger is pushed toward the inlet by a predetermined distance due to an unexpected cause such as a breakdown of the overpressure protective valve, for example, the pin-shaped protrusion stops its guidance. can do. The drip injector according to the present invention is provided by another embodiment, in which the housing has an outlet, the second part of the plunger being sealed by the first part of the plunger if the second part of the plunger is in the joined position and released after the intended movement of the plunger towards the inlet. The structure of the system equipped with can be preferably made.

The invention also relates to a heating system having a closed liquid circulation circuit, in which at least a boiler and an expansion tank are housed, the closed liquid circulation circuit being connected to a liquid source via a drop injector according to the invention under a predetermined pressure. Connected. Apart from big accidents, you get a heating system that doesn't stop due to too low system pressure and water shortages that cause automatic shutdowns.

In order to detect leaks in the liquid circulation circuit, it would be very helpful to be able to clearly see where the amount of liquid flowing into the leak is leaking. According to another embodiment of the present invention this observation is enhanced if the outlet line is connected to the inlet of the replenishment member while the outlet of the drop inlet is in communication with the replenishment line for the closed liquid circulation circuit and the inlet for the reservoir for replenishment. The replenishment member is in open communication with the liquid circulation circuit and the inlet has a valve, which valve is normally in a closed position but is open when there is insufficient water in the liquid circulation circuit. Through these means, a predetermined amount of liquid can be used in the reservoir under a predetermined pressure, which can be instantaneously supplied to the liquid circulation circuit when opening the valve of the replenishment member. This liquid wave makes it possible to see the leak, but it is only an instantaneous liquid wave. If the reservoir is empty, the wave is stopped and replenishment is caused by a drop injector. Thus, the location of the leak can be seen, thereby preventing excess and continuous leakage of the liquid circulation system.

Now, the drop injector and heating system according to the present invention is described in more detail with reference to the embodiment shown in the drawings, which is given by way of non-limiting example only.

The drop injector shown in FIG. 1 has a cylindrical housing 1 with an inlet 2 and an outlet 3. A plunger 4 having a first portion 4a, a second portion 4b, and a pin-shaped protrusion 4c is slidably installed inside the housing 1.

The first portion 4a has a chamber 5 therein for holding the end of the spring 6 by the interposition of the filter plate 20 to receive it, which spring is movable in the housing 1. It is also supported by the annular stop 7 provided. The outer circumferential surface of the first portion 4a moves slidingly along the inner wall of the cylindrical housing 1, while the sealing ring 8 seals the space in the housing 1 to the left and right of the first portion to seal.

The second part 4b of the plunger 4 has a smaller diameter than the first part 4a, so that a space 9 is formed in the housing 1 around the second part 4b. A groove 10 having a passage 11 open at its bottom is provided on the outer circumferential surface of the second portion 4b, which is formed from the chamber 5 of the first portion 4a. On the outer surface of the second portion 4b, the groove 10 is blocked by the O-ring 12 to form a non-return valve so that the O-ring 12 is higher because of the higher pressure in the chamber 5 than the space 9. ) Moves to the outside and releases the connection between the chamber 5 and the space 9, while the O-ring 12 is firmly pressed by a higher pressure in the space 9 than the chamber 5, so that the groove 10 It is pressurized to seal more. Since one of the walls of the groove 10 can be formed and moved by the end of the nut part screwed to the remainder of the second part 4b, the opening pressure of the non-return valve can be adjusted. The two parts 4b are sealed with a sealing ring 19 against the nut part. The second part 4b has a pin-shaped protrusion 4c which extends slidingly into the hole shape of the outlet 3. As clearly shown in FIG. 2, the pin-shaped protrusion 4c has a circumferential groove 13 in which the longitudinal groove 14 is opened. A sealing ring 15 is provided around the fin-shaped protrusion 4c, on the one hand, in contact with the second part 4b and on the other hand, against the wall of the housing. The pin-shaped protrusion 4c has a free end with a conical surface with larger and blunt vertices. The conical surface is in contact with the cam face 16a of the adjusting member 16, which extends across the pin-shaped protrusion 4c, is adjustablely installed in the housing 1 in the longitudinal direction, and sealed. It is sealed about the periphery by the ring 21.

The housing 1 further has a ring groove 17 therein, which communicates with an outlet 18 leading to the periphery.

Now, the operation of the drop injector will be described.

The inlet 2 is connected by means, not shown, to a liquid source, such as a PWS, under certain pressure. At a pressure that interacts with the force exerted by the spring 6, the plunger is pushed to the right in the position shown in FIG. 1. If the liquid pressure in the chamber 5 is higher than the liquid pressure in the space 9, the O-ring 12 moves outward and the liquid flows from the chamber 5 into the space 9. In order to supply liquid to the liquid circulation system connected to the outlet 3 in a manner not shown, the liquid must be able to flow from the space 9 to the outlet 3 and pass through the sealing ring 15. This can be done by pushing the plunger 4 back through the adjusting member 16 to form a micro leak channel at the position of the seal ring 15, whereby the seal ring 15 becomes loose, ie its flat In the sealed form, a rebound from the round forms a minute leak path along the sealing ring. Through this, the liquid leakage finds its path to the circumferential groove 13 and flows through the longitudinal groove 14 to the outlet 3. By appropriately adjusting the adjusting member 16, the liquid is released into the droplets. By releasing the liquid into the liquid circulation system the pressure in the space 9 is reduced, after which replenishment from the chamber 5 takes place again via the non-return valve.

If the liquid pressure of the outlet 3 exceeds the liquid pressure of the space 9 due to special circumstances, the non-return valve prevents liquid from entering the chamber 5 from the space 9. If the pressure difference between the outlet 3 and the inlet 2 is increased such that the plunger 4 is pushed to the left as a whole, i.e. toward the inlet 2, the space 9 is moved to the ring groove 17 after the movement of this plunger 4. ) And the pressure exits through the outlet (18).

3 shows a heating system with a closed liquid circulation circuit 20 having a radiator 21 and a boiler 22. A membraneless expansion tank 24 connected to the liquid circulation circuit 20 via the air collector 23 is provided with a member 25 having a supplementary valve 26 and a degassing valve 27. The valves 26, 27 are normally in a closed state and can be opened by the floats of the expansion tank 24, while the liquid is withdrawn from the closed liquid circulation circuit 20 to the expansion tank 24. Due to the lowering of the liquid level, when the accompanying floating downfall reaches the first height, the deaeration valve 27 is opened, and when the lowering is further lowered to the second height, the replenishment valve 26 is opened. The replenishment valve 26 is connected to the replenishment line 28, one side of which is in open communication with a drop injector connected to the line 30 of the PWS, and the other side of which is connected to the reservoir 31.

Due to the loss of moisture, the floating port of the expansion tank 24 is lowered at a predetermined time so that the replenishment valve 26 is opened and water is supplied from the storage container 31, after which the replenishment valve is closed again and the storage container 31 The water extracted from) is replenished by drop injector 29. The use of the reservoir 31 coupled to the injector 29 is advantageous in that the replenishment fluid accumulated under high pressure is always available immediately even though the liquid is supplied in drops. For example, if an accident occurs in case of accidental lack of water, this predetermined liquid is immediately available. Limited release from the reservoir 31 prevents further damage and immediately indicates where the repair should be performed due to the wave of liquid.

Various applications and modifications are possible within the scope of the invention as defined by the appended claims. Thus, while the present invention has been described with reference to a central heating system, it can likewise be used in production processes and with other liquid systems, in particular where relatively small amounts of liquid need to be supplied, for example to cope with or add to leaks or leaks due to moisture. Will be supplied as If it is sufficient to provide a drop, the supply buffer or drop injector may be in open communication with the liquid system. If supplying a larger amount of liquid than a drop injector is desired for a certain period of time, liquid accumulation can be used to openly communicate with the liquid system at a desired time, which builds up and is achieved by drop injection.

Claims (14)

A method of automatically supplying a liquid from a liquid source to a system as needed, wherein a supply buffer formed from the liquid is created in the closed liquid system and a flow of liquid is allowed between the liquid source and the supply buffer in the direction of the supply buffer. , And said supply buffer portion is created between the liquid source and said closed liquid supply system, wherein droplets can be moved from said supply buffer portion to said closed liquid system. 2. The liquid supply to the closed liquid system according to claim 1, wherein the supply buffer has a minimum volume and the volume is increased when the pressure at the supply buffer exceeds the pressure at the liquid source. How to. 3. A method according to claim 2, wherein the increase in volume of the supply buffer is limited by blowout overpressure protection. 4. A liquid accumulation as claimed in any one of claims 1 to 3, wherein a liquid accumulation is created between the feed buffer and the closed liquid system, which is conveyed in droplets from the feed buffer and supplied by an open connection and is a closed passage. A method of automatically supplying liquid to a closed liquid system, wherein the opening and closing of the passage is controlled according to the size created by the closed liquid system. Said plunger having a cylindrical housing having a cylindrical plunger mounted in the housing so as to be freely movable, said first plunger fitted in the cylindrical housing and a second portion having a smaller diameter than the first portion. Has a passage for connecting the inlet and the space in the housing around the second part, clearly revealing a small leak channel, closing the outlet at the junction, and preventing the flow from the space to the inlet. Droplet injector with a check valve. 6. The plunger of claim 5 wherein the second portion of the plunger extends into a central pin-shaped protrusion, the protrusion slidingly engaged with the aperture of the outlet and providing a connection to the second portion by a circumferential groove. , The circumferential groove is a drop injector, characterized in that the longitudinal groove extending in the longitudinal direction of the pin-shaped projection. 7. The cam face of claim 6 wherein the pin-shaped protrusion is connected to the second portion of the plunger by a base and terminates at the free end, and a sealing ring is installed around the base and the free end is at the joining position of the second part. Wherein the adjustment member is movable relative to the pin-shaped protrusion and is capable of moving the plunger through the pin-shaped protrusion in the longitudinal direction when moved. 8. A method according to any one of claims 5 to 7, wherein the plunger is pushed into the engaged position by a spring, wherein the spring is supported on one of the stops connected to the plunger and the other fixed to the housing. Characterized by drop injector. 9. The injector of claim 8, wherein the stop is adjustable relative to the housing. 10. The valve according to any one of claims 5 to 9, wherein the non-return valve is formed in an annular groove on the outer surface of the second portion of the plunger, which has a side tip and a bottom and communicates with the inlet. A drop injector, wherein the passage is open and sealed away from the bottom by an O-ring joined to the side tip. 11. The drop injector of claim 10, wherein the side edges of the grooves are adjustable relative to each other. 12. The housing according to any one of claims 5 to 11, wherein the housing has an outlet, which is closed to be sealed by the first portion of the plunger when the second portion of the plunger is in the engaged position, A drop injector, which is released after a scheduled movement. A heating arrangement having a closed liquid circulation circuit, wherein at least a boiler and an expansion tank are housed, and the closed liquid circulation circuit is connected to a liquid source under a predetermined pressure via a drop injector according to any one of the preceding claims. The outlet of the drop injector communicates with the replenishment line for the closed liquid circulation circuit and the inlet of the reservoir for replenishment liquid, which is connected to the inlet of the replenishment member, which replenishes the liquid circulation circuit. In communication with said inlet and having a valve, said valve being normally in a closed position but open when there is insufficient water in the liquid circulation circuit.