KR20110095886A - Insert for a flow through heater - Google Patents

Abstract

When feedback loop control is used to control the temperature of the liquid at the outlet 5 of the once-through heater, the volume of the ineffective portion 4 of the once-through heater at the outlet 5 causes a delay in the feedback process. Construct a private body To minimize delay, an insert 6 is applied which functions to reduce the dead volume by occupying most of this volume. In practical cases, the insert 6 comprises a duct system 12 for conveying liquid from the liquid conveying conduit 2 of the flow-through heater 1 to the outlet 10 of the insert 6. Preferably, the volume of this liquid delivery duct system 12 is relatively small so that the presence of the duct system 12 in the insert 6 does not impair the dead volume reduction effect of the application of the insert 6.

Description

Insert for through-flow heaters {INSERT FOR A FLOW THROUGH HEATER}

The present invention relates to a flow through heater having conduits for conveying liquid and means for heating the liquid while flowing through the conduit, and part of the device for controlling the temperature of the liquid at the outlet of the flow through heater. A device for heating a liquid comprising means for detecting the temperature of the liquid at the outlet of the phosphorus flow-through heater.

Moreover, the present invention relates to a method for increasing the accuracy in controlling the temperature of a liquid at the outlet of a once-through heater.

In many types of devices, there is a need for means to heat a certain amount of liquid to be used during operation of the device. For example, in a device suitable for making hot coffee, an amount of water is heated before flowing through an amount of ground coffee bean.

For the purpose of heating a liquid such as water, many devices employ a boiler, i.e. a device having a container for containing a predetermined amount of liquid and a heating means associated with the container and for heating the liquid present inside the container. Equipped. As soon as the temperature of the liquid is at the desired level, the liquid is drawn from the boiler and can be used for its intended use.

However, the application of boilers has some notable disadvantages, and thus the heating of liquids involving the application of a perfusion heater, ie a conduit for conveying liquids and a device with means for heating liquids while flowing through the conduits. Other methods have been developed. In a practical embodiment of the once-through heater, an electrical heating element is arranged around the liquid delivery conduit. Some important advantages of applying a perfusion heater are that the heating process of the liquid is carried out almost instantaneously, so that there is almost no waiting time, less energy is required compared to the application of the boiler, and Not only is it suitable for use as a substitute for, but also for high pressure systems such as espresso devices.

For the purpose of controlling the temperature of the liquid at the outlet of the once-through heater, it is possible that a feedback control loop can be used. In practice, however, it appears difficult or even impossible to meet high demands with regard to outlet temperatures as mentioned. In other words, it appears to be difficult or even impossible to control the operation of the flow-through heater based on the detection of the outlet temperature in a sufficiently accurate manner.

It is an object of the present invention to optimize a feedback control loop in a device comprising a feedback control loop for controlling the flow-through heater and the outlet temperature. This object is achieved by providing an insert partially inserted in the liquid conveying conduit of the perfusion heater at the outlet side of the perfusion heater, wherein the portion of the insert located inside the liquid conveying conduit of the perfusion heater is a heating means of the perfusion heater. Occupies at least a substantial portion of the space present in the portion of the liquid delivery conduit not directly related to the.

According to the findings based on the present invention, the difficulty in controlling the outlet temperature is caused by the delay in the feedback process related to the general design of the flow-through heater. In particular, in this design, the liquid delivery conduits and heating elements are arranged relative to each other in such a way that the conduits extend over a predetermined length with respect to the heating element, both on the inlet side and the outlet side of the flow-through heater. Thus, when the temperature of the liquid is detected at the outlet of the flow-through heater, which is actually the outlet of the conduit, the fact that the liquid first travels through the length of the conduit not directly related to the heating element before reaching the place where the detection occurs. There is a delay caused by. In the following, this phenomenon will be referred to as the presence of a dead volume in the flow-through heater, and the portion of the conduit not directly related to the heating element is referred to as the ineffective portion of the flow-through heater.

It is noted that, for the dead volume and the associated delay time, the larger the dead volume, the more difficult it is to realize the desired average outlet temperature under all circumstances. This is particularly evident when the total volume of the perfusion heater is comparable in comparison with the total volume of the perfusion heater, which is the case in the perfusion heater suitable for use in an espresso device. In general, the longer the delay time, the slower the response of the feedback control loop and the faster the instability occurs. Thus, a longer delay time leads to a limitation of the applicability of the once-through heater. For example, the use of an espresso device is not practically possible because such use requires a fast response feedback control loop.

In many applications, it is important to have the lowest possible manufacturing cost. Thus, in many cases, this is not a viable option for modifying the design of the once-through heater to solve the aforementioned problem. Instead, another solution is required based on the assumption that a conventional flow-through heater is applied. The present invention provides such a solution by proposing the application of an insert which is partially inserted into the liquid conveying conduit of the once through flow heater at the outlet side of the once through flow heater, wherein the part of the insert located inside the liquid conveying conduit of the through flow heater is a dead body. Occupies at least a significant portion of the enemy.

When the insert according to the invention is applied, it is achieved that the dead volume is significantly reduced. This is due to the fact that the portion of the insert located inside the liquid delivery conduit of the perfusion heater fills the dead volume. In many practical cases, this portion of the insert is longer than necessary to keep the insert in place in the liquid delivery conduit when viewed in the flow direction of the liquid in the flow-through heater.

Due to the reduction in the dead volume achieved by applying the insert as mentioned, the delay in detecting the outlet temperature of the liquid is significantly reduced as an advantageous result that controlling the outlet temperature can be carried out more effectively and accurately. According to the present invention, no modification of the design of the flow-through heater is made, and no upgrade of the components used in the temperature control process is achieved to achieve this advantageous result, but only the application of a simple additional component, ie an insert. do.

The part of the insert located inside the liquid delivery conduit and the inner surface of the liquid delivery conduit of the perfusion heater in order to possibly reduce the dead volume of the non-utilized portion of the once-through heater and to have a stable arrangement of inserts in the conduit It is desirable if only a small gap exists between the outer surfaces of the.

In practical cases, the insert includes a duct system for conveying liquid from the liquid delivery conduit of the once-through heater to the outlet of the insert. In this case, the duct (s) of the liquid conveying duct system of the insert serve to convey liquid through the ineffective portion of the once-through heater. Preferably, the diameter of the duct (s) of this liquid delivery duct system is considerably smaller than the diameter of the liquid delivery conduit of the perfusion heater at the outlet of the perfusion heater, so that the volume of the duct (s) is It is much smaller than the volume, and the effect of the reduction of the mortality of the application of the insert can be optimal.

The insert according to the invention may comprise a duct extending from the outer surface of the insert to the liquid conveying duct system at a portion of the insert located outside of the liquid conveying conduit of the flow-through heater, the temperature of the liquid at the outlet of the flow-through heater. Means for detecting are associated with this duct. Preferably, this duct is located as close as possible to the end of the liquid conveying duct of the flow-through heater so that detection of the outlet temperature can occur at a position as close as possible to the end of the liquid conveying conduit, The length of small dead bodies is kept to a minimum.

It is noted that for a liquid delivery duct system, which may be part of an insert, the duct system may comprise at least two ducts oriented at an angle with respect to each other. In an advantageous design, the duct system is at least one duct for introducing liquid into the duct system, wherein the at least one inlet duct is oriented substantially perpendicular to the flow direction of the liquid in the flow-through heater and from one side of the insert to the other side. At least one duct extending into the duct and a duct for outflowing liquid from the duct system, the outlet duct being oriented substantially parallel to the flow direction of the liquid in the flow-through heater, the at least one inlet duct and the outlet duct being Are connected to each other.

The advantage of applying the design of the insert's liquid transport duct system, in which at least one inlet duct is oriented obliquely to the outlet duct and the inlet duct extends from one side of the insert to the other, prevents the situation where liquid remains at the outlet of the insert. It is. The inlet duct functions as a kind of shortcut and liquid cannot reach the outlet of the insert unless suction and / or pressing force is applied. Moreover, it is possible to create various inlet passages when the concept with the angle between the inlet duct (s) and the outlet duct is applied, so that mixing of the liquid is realized at the connection of the inlet duct (s) to the outlet duct, which is more Results in more accurate temperature detection.

In a practical embodiment, in particular in embodiments where the insert comprises a liquid conveying duct system, the device according to the invention is provided between an outer surface of a portion of the insert located inside a liquid conveying conduit of a perfusion heater and an inner surface of the liquid conveying conduit. It may further comprise means for sealing the space of the. By using suitable sealing means, leakage of liquid from the liquid transport conduit through the (narrow) space between the outer surface of the insert and the inner surface of the conduit is prevented. In general, sealing means, which may include an O-ring or the like, are located behind the inlet (s) of the liquid delivery duct system of the insert as viewed in the flow direction of the liquid in the flow-through heater.

Many of the foregoing aspects of the invention emerge from inserts when considered individually. In this case, these aspects are explained as follows.

The insert is generally described as an insert intended for use in a device for heating a liquid as described above,

An end portion suitable for insertion into a liquid conveying conduit which is part of a conduit for carrying liquid, in particular a flow-through heater having means for heating the liquid while flowing through the conduit, and

Duct system for conveying liquid through the insert, the diameter of the duct (s) of the liquid conveying duct system comprising a duct system significantly smaller than the outer diameter of the end portion.

In the insert according to the invention it is advantageous if the liquid delivery duct system comprises at least two ducts oriented at an angle with respect to each other. Preferably, in this case, the liquid delivery duct system is at least one duct for introducing liquid into the duct system, the at least one inlet duct being oriented substantially perpendicular to the axial direction of the insert, ie the longitudinal direction of the insert. And at least one duct extending from one side of the insert to the other side, and a duct for outflow of liquid from the duct system, the outlet duct being oriented substantially parallel to the axial direction of the insert, The duct and the outlet duct are connected to each other.

Ducts extending from the outer surface of the insert to the liquid delivery duct system at other portions of the insert other than the end portions suitable for insertion of the insert into the conduit for conveying liquid, for the purpose of allowing temperature detection of the liquid inside the insert. It is advantageous to include further.

Sealing means preferably used to avoid leakage of liquid from the liquid conveying conduit of the once-through heater may be provided as part (s) of the insert. In this case, the insert further comprises means, such as an O-ring, suitable for use to seal the space between the two surfaces, the sealing means being at an end portion suitable for insertion into a conduit for conveying liquid. Is located.

In addition to the device for heating the liquid as described above, the present invention also increases the accuracy at the outlet of the flow through heater having conduits for transporting the liquid and means for heating the liquid while flowing through the conduit. As a method, at least a substantial portion of the space present in the portion of the liquid conveying conduit of the flow through heater that is not directly related to the heating means of the flow through heater provides an insert and conveys liquid in the flow through heater at the outlet side of the flow through heater. Also provided is a method of filling by introducing at least a portion of an insert into a conduit.

Preferably, when the method according to the invention is carried out, only a small clearance is allowed between the inner surface of the liquid conveying conduit of the flow-through heater and the outer surface of the part of the insert inserted in the liquid conveying conduit.

The inserts applied when the method according to the invention is carried out may be an insert or any other suitable insert as defined above, provided that the reduction of the dead volume can be achieved through the occupancy of this volume and the flow of liquid is not blocked. Can be.

The foregoing and other aspects of the invention will be apparent from and elucidated with reference to the following detailed description of embodiments of inserts according to the invention.

The invention will now be described in more detail with reference to the drawings in which equivalent or similar parts are indicated by the same reference numerals.

1 is a schematic illustration of a once-through heater.
2 shows schematically a part of an insert and a once-through heater according to the invention;
3 and 4 show two longitudinal sections of a liquid delivery conduit of an insert and a once-through heater.

1 schematically shows a once-through heater 1 known in the art. In general, the flow-through heater 1 comprises a liquid conveying conduit 2 and a heating element 3 arranged to closely surround the liquid conveying conduit 2, for example. In most cases, the cross-sectional area of the liquid delivery conduit has a circular shape, which does not change the fact that other shapes are likewise possible.

In FIG. 1, it can be clearly seen that not all lengths of the liquid conveying conduit 2 are covered by the heating element 3. On both the inlet and outlet sides of the flow-through heater 1, the length 4 of the liquid conveying conduit 2 is not directly related to the heating element 3. These length portions 4 are referred to as non-utilization portions 4 of the flow-through heater 1.

During operation of the once-through heater 1, a liquid such as water flows through the liquid transport conduit 2 while the heating element 3 is operated to supply heat to the liquid to achieve an increase in the temperature of the liquid. do. Three important factors in achieving the desired temperature of the liquid at the outlet 5 of the flow-through heater 1 are the initial temperature of the liquid, the flow rate and the supply of heat. In order to check whether the actual outlet temperature of the liquid is within the desired range and to check whether the parameters of the perfusion heating process, such as powering the heating element 3 of the once-through heater 1, need to be adjusted, It is common practice to have a feedback control loop that is detected and used as the basis for possible adjustments. However, due to the presence of the ineffective part 4 at the outlet of the liquid conveying conduit 2 of the once-through heater 1, there is a delay in the feedback control loop, which adversely affects the accuracy of the temperature control process.

The delay in the feedback control loop is directly related to the volume of the ineffective portion 4 at the outlet of the once-through heater 1 called the dead volume. For example, the ineffective portion 4 has a length of 2 cm, the inner diameter of the liquid conveying conduit 2 is 1 cm, the flow rate is 5 ml / s, and the outlet temperature is the outlet of the flow-through heater 1. When detected at (5), the delay time is shown as 0.314 s. This value is found by detecting the dead volume and dividing it by the flow rate. The dead volume is pi * r ² * l = pi * 0.5 ² * 2 = 1.57 ml, where r is the inner diameter of the liquid conveying conduit 2 and l is the length of the ineffective part 4 of the flow-through heater 1 to be. Therefore, the delay time is 1.57 / 5 = 0.314 s. For example, in applications involving the production of espresso, the dead volume of 1.57 ml is significant compared to the total volume. Thus, in this case, the dead volume has a significant effect on the final temperature of the beverage.

In order to minimize the delay in the feedback control loop, the present invention proposes a means for making the dead volume as small as possible. These means involve the application of an insert 6 partially inserted into the liquid conveying conduit 2 of the once-through heater 1, as shown by FIG. 2 where the insert 6 is indicated by dashed lines. . Moreover, FIG. 2 indicates the proper position of the temperature sensor 7 at the part of the insert 6 just outside the flow-through heater 1. The insert 6 is preferably designed to at the same time remove as much dead volume as possible while allowing for the required flow rate of the liquid. The design of the insert 6 shows the longitudinal section of the insert 6 as well as the part of the liquid conveying conduit 2 of the flow-through heater 1 in which the insert 6 is partially inserted. It will be further explained based on 4.

As shown in FIGS. 3 and 4, the example of insert 6 comprises three parts. The first part 8 is an end part suitable for being located inside the non-utilization part 4 of the once-through heater 1. Thus, the outer diameter of this end portion 8 of the insert 6 is smaller than the inner diameter of the liquid conveying conduit 2 of the flow-through heater 1. The second part 9 is another end part which allows the connection of a hose or the like to the insert 6 and has an outlet 10 for liquid at its free end. The third part 11 is for example an intermediate part which is intended to be arranged in contact with the end of the liquid conveying conduit 2 of the flow-through heater 1. Thus, the outer diameter of this intermediate portion 11 of the insert 6 is larger than the inner diameter of the liquid conveying conduit 2 of the flow-through heater 1.

Inside the insert 6, a duct system 12 for conveying liquid through the insert 6 is arranged. On the inlet side, i.e., the side closest to the once-through heater 1, the duct system 12 extends in the radial direction of the insert 6, ie in a direction perpendicular to the flow direction of the liquid in the once-through heater 1. Two ducts 13a, 13b. These ducts 13a and 13b serve to introduce liquid into the insert 6 and to transport the liquid to a central position inside the insert 6 where the ducts 13a and 13b intersect. Extending from this position to the outlet 10 of the insert 6, an outlet duct 14 is present inside the insert 6. For the sake of completeness, it is noted that the flow direction of the liquid in the flow-through heater 1 is indicated by an arrow in the figure.

It will be apparent that designs other than the aforementioned design of the liquid delivery duct system 12 of the insert 6 are possible within the scope of the present invention. For example, there may be a single central duct extending through the insert 6. However, a configuration with radially oriented inlet ducts 13a, 13b is preferred, which makes it possible to avoid the situation where liquid is not refreshed and remains on the exit side of insert 6 when this configuration is realized. Because. This is important in view of the fact that the residual amount of liquid can be a source of bacterial growth. Moreover, by introducing liquid from various aspects of the insert 6, mixing of the liquid is achieved, which contributes to smooth temperature detection.

In addition to the ducts 13a, 13b, 14 for conveying the liquid, the insert 6 receives one or more parts or parts of parts (not shown in FIGS. 3 and 4) to be used in the process of detecting the outlet temperature of the liquid. It has the duct 15 for doing so. In the following, this duct 15 will be referred to as detection duct 15. The detection duct 15 is arranged in the middle portion 11 of the insert 6 and is external to the insert 6 to allow free access of the detection component (s) to the liquid flowing through the outlet duct 14. It extends from the face into the outlet duct 14. In the example shown, the detection duct 15 has a radial orientation in the insert 6, such as the inlet ducts 13a, 13b.

For the purpose of avoiding the leakage of liquid from the liquid conveying conduit 2 of the once-through heat 1, the sealing means is provided at a position behind the position where the inlet ducts 13a, 13b of the insert 6 are located. It is arranged between the inner face of 2) and the outer face of the insert 6. Within the scope of the present invention, any suitable type of sealing means may be applied. In the example shown, the sealing means comprises an O-ring 16 received in a groove arranged on the outer surface of the insert 6.

3 and 4 show the dimensions of the end portion 8 of the insert 6 suitable for being located inside the non-utilization portion 4 of the flow-through heater 1, when the insert 6 is in its proper position. It is shown that there is only a minimum space between the outer face of this part 8 of the insert 6 and the inner face of the liquid conveying conduit 2 of the flow-through heater 1. In general, when the insert 6 is placed in place on the outlet side of the once-through heater 1, most of the volume of the non-utilized portion 4 of the once-through heater 1 is filled and the outlet temperature of the liquid is detected. The volume causing the delay in is only the volume that is the sum of the spaces existing between the outer surface of the inserted portion 8 of the insert 6 and the inner surface of the liquid conveying conduit 2 of the perfusion-type heater 1, The volume of the inlet duct 13a, 13b of the insert 6 and the volume of the outlet duct 14 between the connection part to the inlet duct 13a, 13b and the position of the detection duct 15 is below.

The diameters of the ducts 13a, 13b, 14 of the liquid delivery duct system 12 of the insert 6 are larger than the diameter of the liquid delivery conduit 2 of the perfusion heater 1 at the outlet side of the perfusion heater 1. It is most advantageous if the body size is quite small so that the actual volume can be as small as possible. Due to the reduction in the dead volume of the ineffective portion 4 of the once-through heater 1, the present invention allows an improved way of controlling the outlet temperature, which leads to a better performance of the device to which the present invention can be applied. . Examples of such devices worth mentioning here are various types of coffee and espresso devices and infant milk devices, including beverage preparation devices, in particular drip filter and pad treatment types.

During the manufacturing process of the device to which the present invention is applied, a conventional once-through heater 1 is provided, in which the dead volume at the outlet side of the once-through heater 1 provides an insert 6 according to the present invention and a once-through heater. By introducing the end portion 8 of the insert 6 into the liquid conveying conduit 2 of (1).

It will be apparent to those skilled in the art that the scope of the invention is not limited to the examples described above, and that many modifications and variations are possible without departing from the scope of the invention as defined in the appended claims. will be. Although the present invention has been shown and described in the drawings and detailed description, such illustration and description are to be considered in all respects only as illustrative and illustrative. The invention is not limited to the disclosed embodiments.

Modifications of the disclosed embodiments can be understood and practiced by those skilled in the art upon practicing the claimed invention from a study of the drawings, the description and the appended claims. In the claims, the term comprising does not exclude other steps or elements, and the term “a” or “an” does not exclude a plurality. The fact that only certain means are cited in different dependent claims does not indicate that a combination of these means cannot be used with advantage. Any reference signs in the claims should not be construed as limiting the scope of the invention.

The present invention can be summarized as follows. In the flow-through heater 1 of the conventional design, the utility portion and the two non-utilization portions 4 located at the end of the flow-through heater 1 can be distinguished, and the non-utilization portion 4 is a flow-through heater. The liquid conveying conduit 2 of (1) is a part which is not directly related to the heating means 3 of the once-through heater 1. When feedback loop control is used to control the temperature of the liquid at the outlet 5 of the once-through heater 1, the volume of the non-utilized portion 4 at the outlet 5 causes a delay in the feedback process and thus the temperature It constitutes a dead volume that causes instability and inefficiency of control. To prevent this, delay should be minimized. Therefore, it is required to detect the outlet temperature as soon as possible after the utility portion of the flow-through heater 1 as viewed in the flow direction of the liquid in the flow-through heater 1. This is realized by applying the insert 6 to reduce the dead volume by occupying most of this volume. In practical cases, the insert 6 comprises a duct system 12 for conveying liquid from the liquid conveying conduit 2 of the flow-through heater 1 to the outlet 10 of the insert 6. Preferably, in this case, the diameter of the duct (s) 13a, 13b, 14 of the liquid conveying duct system 12 is determined by the flow rate of the flow through heater 1 at the outlet 5 of the flow through heater 1. Significantly smaller than the diameter of the liquid conveying conduit 2, the volume of the liquid conveying duct system 12 becomes relatively small, and the presence of the duct system 12 in the insert 6 reduces the volumetric effect of the application of the insert 6 It will not damage.

1: through-flow heater 2: liquid conveying conduit
3: heating element 4: ineffective part
5: exit 6: insert
7: temperature sensor 8: first part
9: second part 10: exit
11: middle part 12: duct system
13a, 13b, 14: duct 15: duct

Claims (9)

A device for heating a liquid,
A through-flow heater (1) having a conduit (2) for carrying liquid and means (3) for heating said liquid while flowing through said conduit (2),
Means for detecting the temperature of the liquid at the outlet 5 of the flow-through heater 1, which is part of a device for controlling the temperature of the liquid at the outlet 5 of the flow-through heater 1 ( 7) and,
An insert 6 partially inserted into the liquid conveying conduit 2 of the perfusion heater 1 at the outlet side of the perfusion heater 1, wherein the liquid conveying conduit 2 of the perfusion heater 1 The portion 8 of the insert 6 located therein is at least a significant portion of the space present in the portion 4 of the liquid conveying conduit 2 which is not directly related to the heating means of the flow-through heater 1. A device comprising said insert (6) which occupies a part. 2. The method according to claim 1, wherein the inner surface of the liquid conveying conduit 2 of the flow-through heater 1 and the outer surface of the portion 8 of the insert 6 located inside the liquid conveying conduit 2. There are only few clearances present in the device. 2. The insert (6) according to claim 1, wherein the insert (6) comprises a duct system (12) for conveying liquid from the liquid conveying conduit (2) of the flow-through heater (1) to the outlet (10) of the insert (6). The diameter of the duct (s) 13a, 13b, 14 of the liquid conveying duct system 12 may be such that the liquid conveying conduit of the flow-through heater 1 at the outlet 5 of the flow-through heater 1. Device significantly smaller than the diameter of 2). 4. Device according to claim 3, wherein the liquid delivery duct system (12) of the insert (6) comprises at least two ducts (13a, 13b, 14) oriented at an angle to one another. 5. The liquid delivery duct system 12 of the insert 6 is at least one duct 13a, 13b for introducing liquid into the duct system 12, the at least one inlet duct. 13a, 13b are the at least one duct 13a, 13b oriented substantially perpendicular to the flow direction of the liquid in the flow-through heater 1 and extending from one side of the insert 6, and the duct system A duct 14 for outflowing liquid from 12, wherein the outlet duct 14 is oriented substantially parallel to the flow direction of the liquid in the flow-through heater 1 and the at least one inlet duct ( 13a, 13b) and said outlet duct (14) are connected to each other. 4. The insert (6) according to claim 3, wherein the insert (6) is external to the insert (6) in a portion (11) of the insert (6) located outside the liquid transport conduit (2) of the flow-through heater (1). And further comprising a duct 15 extending from the face to the liquid conveying duct system 12, wherein the means 7 for detecting the temperature of the liquid at the outlet 5 of the flow-through heater 1 are A device associated with the duct 15. 4. An inner surface of the liquid delivery conduit (2) according to claim 3, characterized in that between the outer surface of the portion (8) of the insert (6) located inside the liquid delivery conduit (2) of the flow-through heater (1). The device further comprises means (16) for sealing the space. Accuracy in controlling the temperature of the liquid at the outlet of the flow-through heater 1 having a conduit 2 for conveying liquid and means 3 for heating the liquid while flowing through the conduit 2 As a way to increase
At least a substantial portion of the space present in the portion 4 of the liquid conveying conduit 2 of the flow-through heater 1, which is not directly related to the heating means 3 of the flow-through heater 1, is inserted into the insert 6. And filling at least a portion (8) of the insert (6) into the liquid conveying conduit (2) of the perfusion heater (1) at the outlet side of the perfusion heater (1). The method according to claim 8, wherein only between the inner surface of the liquid conveying conduit 2 of the flow-through heater 1 and the outer surface of the portion 8 of the insert 6 inserted into the liquid conveying conduit 2. How little play exists.

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