Conveying device

Abstract

The utility model relates to a conveying device. The conveying device comprises a gear pump, a connecting frame and a magnetic coupler. The gear pump is configured to convey a conveying medium; an isolation hood of the magnetic coupling is connected with the connecting frame to form a cavity for accommodating an inner magnet of the magnetic coupling, and a driving shaft of the gear pump penetrates through the connecting frame, extends into the cavity and is connected with the inner magnet; the connecting frame is provided with a cooling medium cavity surrounding a driving shaft of the gear pump, a liquid injection connector and a liquid outlet connector, the liquid injection connector and the liquid outlet connector are communicated with the cooling medium cavity, and the temperature of the conveying medium is higher than that of the cooling medium. In the process that the conveying medium flows to the magnetic coupling, the connecting frame surrounds the cooling medium in the cooling medium cavity of the driving shaft of the gear pump, the conveying medium can be well cooled, and the situation that the temperature of the conveying medium is too high, so that the magnetic coupling loses efficacy, and the machine pump cannot operate normally is prevented.

Description

Technical Field

[0001] The present disclosure relates to the technical field of pump body sealing, and in particular to a conveying device. Background Art

[0002] Gear pump is a commonly used conveying equipment at present. It mainly uses a magnetic coupling to connect the power output shaft of the motor and the driving shaft of the gear pump, so as to drive the driving gear and the driven gear of the gear pump to mesh and rotate after starting the motor, thereby achieving the purpose of transmitting the medium.

[0003] However, due to problems such as poor pump body sealing, part of the conveying medium will flow into the magnetic coupling along the driving shaft of the gear pump. In this case, if the temperature of the conveying medium is too high, the magnetic elements in the magnetic coupling will be demagnetized and fail due to high temperature, which will eventually cause the gear pump to fail to operate normally.

[0004] In view of this, how to avoid the demagnetization and failure of the magnetic coupling when the gear pump is conveying high-temperature media is a technical problem that needs to be solved urgently by technical personnel in this field. Utility Model Content

[0005] In order to solve the problem of high-temperature demagnetization of the magnetic coupling when the gear pump in the prior art conveys high-temperature media, the present disclosure provides a conveying device.

[0006] The present disclosure provides a conveying device, the conveying device comprising:

[0007] a gear pump configured to convey a conveying medium;

[0008] Connecting frame;

[0009] A magnetic coupling, wherein the isolation cover of the magnetic coupling is connected to the connecting frame to form a chamber for accommodating an inner magnet of the magnetic coupling, and the driving shaft of the gear pump passes through the connecting frame, extends into the chamber and is connected to the inner magnet;

[0010] The connecting frame has a cooling medium cavity surrounding the driving shaft of the gear pump, and a liquid injection interface and a liquid outlet interface communicated with the cooling medium cavity. The temperature of the conveying medium is higher than the temperature of the cooling medium.

[0011] In one embodiment of the present disclosure, the connecting frame comprises:

[0012] A sleeve, the sleeve is configured to surround and rotatably support the driving shaft of the gear pump and is provided with the cooling medium cavity;

[0013] A connecting flange surrounds the driving shaft of the gear pump and is constructed as an isolation cover connecting the sleeve and the magnetic coupling, and the connecting flange has an injection channel and a liquid outlet channel, the injection channel connects the injection interface and the cooling medium cavity, and the liquid outlet channel connects the liquid outlet interface and the cooling medium cavity.

[0014] In one embodiment of the present disclosure, the cooling medium cavity extends axially from one end to the other end of the sleeve.

[0015] In one embodiment of the present disclosure, the conveying device further comprises a sealing plug, which is detachably connected to the connecting flange to seal the liquid injection interface and the liquid outlet interface.

[0016] In one embodiment of the present disclosure, the sealing plug and the connecting flange are connected by threads.

[0017] In one embodiment of the present disclosure, the liquid injection channel and the liquid outlet channel extend in a radial direction of the connecting flange.

[0018] In one embodiment of the present disclosure, the outer peripheral wall of the sleeve has a plurality of ribs arranged in sequence along the circumferential direction, and the ribs extend from the connecting flange to the main housing of the gear pump, and the main housing is constructed to accommodate two gears of the gear pump that are meshed with each other.

[0019] In one embodiment of the present disclosure, the delivery device further comprises:

[0020] Cooling medium storage tank;

[0021] a cooling medium delivery pump, the cooling medium delivery pump being configured to deliver the cooling medium in the cooling medium storage barrel to the cooling medium cavity via the liquid injection interface;

[0022] A cooling medium recovery barrel is connected to the liquid outlet interface.

[0023] In one embodiment of the present disclosure, the temperature of the conveying medium is 200°C to 150°C.

[0024] In one embodiment of the present disclosure, the temperature of the cooling medium is 120°C to 100°C.

[0025] One beneficial effect of the present disclosure is that the conveying device provided by the present disclosure includes a gear pump, a connecting frame and a magnetic coupling. When the gear pump conveys the medium, part of the medium flows into the magnetic coupling along the driving shaft of the gear pump. In the process of the conveyed medium flowing to the magnetic coupling, the cooling medium in the cooling medium cavity of the connecting frame surrounding the driving shaft of the gear pump will have a good cooling effect on the conveyed medium, preventing the conveyed medium temperature from being too high to cause the magnetic coupling to fail, thereby causing the machine pump to fail to operate normally.

[0026] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0028] Figure 1 is a schematic diagram of an axial cross-sectional structure of a conveying device provided by an embodiment of the present disclosure;

[0029] Figure 2 It is a schematic diagram of the radial cross-sectional structure of a conveying device along the AA direction provided by an embodiment of the present disclosure.

[0030] Figure 1 and Figure 2 The one-to-one correspondence between the component names and the reference numerals is as follows:

[0031] 1. Gear pump; 11. Driving shaft;

[0032] 2. Connecting frame; 21. Sleeve; 211. Cooling medium cavity; 22. Connecting flange; 221. Liquid injection interface; 222. Liquid outlet interface; 223. Liquid outlet channel; 224. Liquid injection channel;

[0033] 3. Magnetic coupling; 31. Inner magnet; 32. Isolation cover; 33. Outer magnet. DETAILED DESCRIPTION

[0034] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure unless otherwise specifically stated.

[0035] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0036] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0037] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0038] The specific embodiments of the present disclosure are described below in conjunction with the accompanying drawings.

[0039] In this document, “upper”, “lower”, “front”, “back”, “left”, “right”, etc. are only used to indicate the relative position relationship between related parts, rather than to limit the absolute positions of these related parts.

[0040] In this article, "first", "second", etc. are only used to distinguish each other, and do not indicate the importance and order, or the premise of each other's existence.

[0041] In this document, “equal”, “same”, etc. are not strictly limited in a mathematical and / or geometric sense, but also include errors that can be understood by those skilled in the art and are allowed in manufacturing or use.

[0042] In order to solve the problem that when the temperature of the conveying medium of the current conveying device is too high, the magnetic coupling may be demagnetized, thereby causing the conveying device to fail to operate normally, the present disclosure provides a conveying device.

[0043] The conveying device includes a gear pump 1, a connecting frame 2 and a magnetic coupling 3. The gear pump 1 is configured to convey a conveying medium; the isolation cover 32 of the magnetic coupling 3 is connected to the connecting frame 2 to form a chamber for accommodating the inner magnet 31 of the magnetic coupling 3; the driving shaft 11 of the gear pump 1 passes through the connecting frame 2 and extends into the chamber and is connected to the inner magnet 31.

[0044] It should be noted that, during the process of the conveying device conveying the conveying medium, a small amount of conveying medium will flow from the medium cavity of the gear pump along the gap between the driving shaft 11 of the gear pump 1 and the connecting frame into the cavity where the inner magnet of the magnetic coupling is located, that is, the cavity formed by the isolation cover 32 of the magnetic coupling 3 and the connecting frame 2.

[0045] Since these conveying media will be in direct contact with the internal magnet 31 of the magnetic coupling 3, if the temperature of the conveying medium is too high, usually when the temperature of the conveying medium exceeds the demagnetization critical temperature value of the magnetic coupling, the magnetic coupling 3 will be demagnetized, resulting in the conveying device being unable to operate normally.

[0046] Of course, the critical demagnetization temperature value of the magnetic coupling depends on the characteristics of its internal magnetic elements. Technical personnel in this field can select a suitable temperature value as the critical demagnetization temperature value based on actual conditions. For example, under normal circumstances, the critical demagnetization temperature value of the magnetic coupling is 150°C (degrees Celsius).

[0047] To this end, the connecting frame 2 of the conveying device disclosed in the present invention has a cooling medium cavity 211 surrounding the driving shaft 11 of the gear pump 1, and a liquid injection interface 221 and a liquid outlet interface 222 connected to the cooling medium cavity 211, and the temperature of the conveying medium is higher than the temperature of the cooling medium.

[0048] Specifically, see Figure 1 , the specific working process of the above-mentioned conveying device is:

[0049] The user first connects the motor to the external magnet 33 of the magnetic coupling 3 in the conveying device. After the motor is started, it drives the driving shaft 11 of the gear pump 1 to rotate through the magnetic coupling 3, and then drives the gears inside the gear pump 1 to mesh and rotate, thereby conveying the conveying medium.

[0050] Under the action of the gear pump 1, most of the conveying medium will be discharged from the outlet of the gear pump 1. Since there is a gap between the gear pump 1 housing and the gear pump 1 driving shaft 11, a small part of the conveying medium will pass through the gap along the driving shaft 11 and enter the inside of the connecting frame 2. The specific flow route of the above conveying medium is as follows: Figure 1 As shown by the hollow arrow, the connecting frame 2 and the driving shaft 11 are also clearance-matched, so this small portion of the conveying medium will continue to flow through the gap between the connecting frame 2 and the driving shaft 11 and eventually enter the isolation cover 32 of the magnetic coupling 3 .

[0051] While the gear pump 1 is conveying the conveying medium, part of the conveying medium flows into the magnetic coupling 3 along the driving shaft 11 of the gear pump 1 and remains in the chamber formed by the magnet 31 in the magnetic coupling 3 and the connecting frame 2, thereby preventing the conveying medium from leaking to the external environment.

[0052] Prior to this, the user will inject cooling medium into the cooling medium cavity 211 inside the connecting frame 2 through the injection interface 221 on the connecting frame 2. Since the temperature of the cooling medium is lower than the temperature of the conveying medium, the cooling medium can have a good cooling effect on the conveying medium through the connecting frame 2. Therefore, in the process of the conveying medium flowing from the inside of the gear pump 1 to the magnetic coupling 3, the conveying medium is affected by the cooling medium, and the temperature will continue to drop, and finally drop to below the temperature critical value of the magnetic coupling 3 demagnetization, effectively preventing the magnetic coupling 3 from being demagnetized due to high temperature.

[0053] That is to say, the conveying device disclosed in the present invention uses a cooling medium whose temperature is lower than that of the conveying medium to cool the conveying medium, so that the temperature of the medium in the chamber where the inner magnet entering the magnetic coupling 3 is located is lower than the demagnetization critical temperature value of the magnetic coupling, which cleverly solves the problem of demagnetization of the magnetic coupling caused by the transmission of high-temperature medium, thereby ensuring the normal operation of the conveying device.

[0054] It should also be noted that in actual application, considering that the temperature of the conveying medium is too high, if the conveying device is not warmed up before operation, the gear pump 1 may be heated unevenly, resulting in a temperature difference between the upper and lower parts of the pump body. Moreover, after the gear pump 1 is started, the gear pump 1 will be subjected to direct thermal shock from the high-temperature conveying medium, causing uneven thermal expansion, aggravating the temperature difference between the upper and lower parts of the gear pump 1, and causing the pump body to deform, leak, wear the moving and static parts inside the pump, and even seize the shaft. Therefore, the housing of the gear pump 1 is also provided with a warm-up jacket.

[0055] Therefore, before starting the conveying device, the user needs to warm up the gear pump 1 through the jacket.

[0056] In one embodiment of the present disclosure, the connecting frame 2 includes a sleeve 21 and a connecting flange 22 .

[0057] The sleeve 21 is configured to surround and rotatably support the driving shaft 11 of the gear pump 1 and is provided with a cooling medium cavity 211;

[0058] The connecting flange 22 surrounds the driving shaft 11 of the gear pump 1 and is constructed as an isolation cover 32 connecting the sleeve 21 and the magnetic coupling 3, and the connecting flange 22 has an injection channel 224 and a liquid outlet channel 223, the injection channel 224 connects the injection interface 221 and the cooling medium cavity 211, and the liquid outlet channel 223 connects the liquid outlet interface 222 and the cooling medium cavity 211.

[0059] Specifically, see Figure 1 One end of the sleeve 21 is fixed to the housing of the gear pump 1, and the driving shaft 11 extending from the inside of the gear pump 1 passes through the sleeve 21. Since a cooling medium cavity 211 is provided inside the sleeve 21, the cooling medium stored in the cooling medium cavity 211 can well reduce the temperature of the sleeve 21, and the conveying medium in direct contact with the sleeve 21 is cooled by reducing the temperature of the sleeve 21.

[0060] Combination Figure 2The other end of the sleeve 21 is fixed to the connecting flange 22. The connecting flange 22 is provided with an injection channel 224 and an outlet channel 223. The outer periphery of the connecting flange 22 is provided with an injection interface 221 and an outlet interface 222. When the user uses the conveying device, the injection interface 221 and the outlet interface 222 need to be connected to an external device for conveying cooling medium. The injection interface 221 is connected to the injection channel 224, and the outlet interface 222 is connected to the outlet channel. Therefore, the cooling medium can enter the injection channel 224 inside the connecting flange 22 through the injection interface 221, and then enter the cooling medium cavity 211 inside the sleeve 21. The specific flow route of the cooling medium is as follows: Figure 1 , Figure 2 As shown by the solid arrow in .

[0061] The cooling medium in the cooling medium cavity 211 is affected by the external conveying device and does not stay in the cooling medium cavity 211, but circulates in the cooling medium cavity 211 and is then discharged to the external device for collecting the cooling medium through the liquid outlet channel 223. The circulating flow of the cooling medium in this way can effectively enhance the cooling effect of the cooling medium on the conveying medium and improve the cooling efficiency.

[0062] Considering that the connection flange 22 and the driving shaft 11 of the gear pump 1 are clearance-fitted, a bearing is provided between the connection flange 22 and the driving shaft 11 of the gear pump 1. The connection flange 22 can provide good support to the driving shaft 11 of the gear pump 1 through the bearing, thereby preventing the driving shaft 11 extending to the outside of the gear pump 1 from being too long and deforming due to the long-term cantilever force. At the same time, the conveying medium lubricates the bearing when passing through the bearing and entering the magnetic coupling 3.

[0063] In actual use, the above-mentioned bearing is preferably a high temperature resistant rolling bearing.

[0064] In one embodiment of the present disclosure, the cooling medium cavity 211 extends axially from one end of the sleeve 21 to the other end. Figure 1 The cooling medium cavity 211 is arranged along the axial direction of the sleeve 21, and in order to enable the cooling medium to better cool the conveying medium, the cooling medium cavity 211 needs to be extended axially from one end of the sleeve 21 to the other end, so as to increase the contact area between the cooling medium and the sleeve 21 and improve the cooling efficiency.

[0065] In one embodiment of the present disclosure, the conveying device further includes a sealing plug, which is detachably connected to the connecting flange 22 to seal the liquid injection interface 221 and the liquid outlet interface 222 .

[0066] In actual application, considering that the user may need to move the installation position of the conveying device during use, in order to facilitate the migration of the conveying device, the injection interface 221 and the liquid outlet interface 222 on the connecting flange 22 are detachably connected to the external cooling medium conveying device.

[0067] When the user needs to move the conveying device, he only needs to disconnect the conveying device from the external device for conveying the cooling medium. In addition, it is considered that the cooling medium inside the conveying device may leak through the liquid injection interface 221 and the liquid outlet interface 222, thereby causing pollution to the working environment. Therefore. The conveying device is also provided with a sealing plug, which is detachably connected to the liquid injection interface 221 and the liquid outlet interface 222 of the connecting flange 22 after the conveying device is disconnected from the external device for conveying the cooling medium, and the liquid injection interface 221 and the liquid outlet interface 222 are blocked to prevent leakage of the cooling medium.

[0068] In addition, this arrangement is also conducive to the maintenance of the equipment and the replacement of external cooling medium transport equipment, thereby reducing the maintenance and modification costs of the equipment.

[0069] In one embodiment of the present disclosure, the sealing plug and the connecting flange 22 are connected by threads. Specifically, external threads are provided on the injection interface 221 and the liquid outlet interface 222 on the outer periphery of the connecting flange 22, and internal threads are provided on the sealing plug, and the two cooperate with each other. Of course, internal threads can also be provided on the injection interface 221 and the liquid outlet interface 222, and corresponding external threads can be provided on the sealing plug to match them.

[0070] The threaded connection has a reliable structure and is easy to process, which is beneficial to reducing processing costs and simplifying the assembly and disassembly process.

[0071] In one embodiment of the present disclosure, the liquid injection channel 224 and the liquid outlet channel 223 extend along the radial direction of the connecting flange 22 .

[0072] See also Figure 2 The injection channel 224 and the outlet channel 223 inside the connecting flange 22 are arranged along the radial direction of the connecting flange 22, and the injection channel 224 and the outlet channel 223 are connected to the cooling medium cavity 211 inside the sleeve 21 at one end close to the center of the connecting flange 22. Such an arrangement is conducive to the circulation of the cooling medium inside the connecting frame 2, thereby improving the cooling efficiency.

[0073] In one embodiment of the present disclosure, the outer peripheral wall of the sleeve 21 has a plurality of ribs spaced in sequence along the circumferential direction, and the ribs extend from the connecting flange 22 to the main housing of the gear pump 1, and the main housing is constructed to accommodate two gears of the gear pump 1 that are meshed with each other.

[0074] Since the connecting frame 2 is arranged at the side end of the gear pump 1 in a cantilever structure, the connecting frame 2 may be bent and deformed under its own gravity, causing damage to the structure of the connecting frame 2. Therefore, a plurality of ribs are arranged on the outer periphery of the sleeve 21, which is conducive to strengthening the structure of the connecting frame 2 and preventing the connecting frame 2 from being deformed.

[0075] In one embodiment of the present disclosure, the conveying device also includes a cooling medium storage barrel and a cooling medium conveying pump, and the cooling medium conveying pump is configured to convey the cooling medium in the cooling medium storage barrel to the cooling medium cavity 211 via the liquid injection interface 221; the cooling medium recovery barrel is connected to the liquid outlet interface 222.

[0076] The cooling medium delivery pump is used as an external cooling medium delivery device, and is connected to the liquid injection interface 221 on the connecting frame 2 through a pipeline, so as to inject cooling medium into the cooling medium cavity 211 inside the connecting frame 2. At the same time, under the action of the cooling medium delivery pump, the cooling medium in the cooling medium cavity 211 is squeezed and discharged from the liquid outlet interface 222, and finally recovered by the external cooling medium recovery device, that is, the cooling medium recovery barrel, to achieve the recycling of the cooling medium.

[0077] Of course, in actual application, in order to simplify the equipment, the external cooling medium conveying equipment and the recycling equipment can also be integrated, that is, the cooling medium inside the connecting frame 2 is recycled by the recycling equipment, flows to the cooling medium conveying equipment after cooling, and is re-input into the connecting frame 2 by the conveying equipment. In this way, the cooling medium can be recycled multiple times and the cooling efficiency can be improved.

[0078] In one embodiment of the present disclosure, the temperature of the conveying medium is 200°C to 150°C.

[0079] As mentioned above, the magnetic coupling 3 made of ordinary materials may be demagnetized at high temperature when the temperature exceeds 150°C, causing the conveying device to malfunction. Therefore, for the magnetic coupling 3 made of ordinary materials, for the conveying medium with a temperature of 200°C to 150°C, the conveying device provided by the present disclosure can cool down part of the high-temperature conveying medium flowing into the magnetic coupling 3, and ensure that the magnetic coupling 3 will not be demagnetized, thereby improving the safety of the operation of the conveying device.

[0080] Of course, for some magnetic couplings 3 designed with high temperature resistant materials, it is allowed to transport the transport medium with higher temperature.

[0081] In one embodiment of the present disclosure, the temperature of the cooling medium is 120°C to 100°C.

[0082] In actual application, for a conveying medium with a temperature of 200°C to 150°C, the conveying device provided by the present invention needs to inject the cooling medium into the cooling medium cavity 211 with a temperature of 120°C to 100°C, which can ensure that the magnetic coupling 3 does not demagnetize.

[0083] It should be noted that the above-mentioned temperature setting of the cooling medium is mainly for the conveying medium which is a low-temperature medium that is easy to solidify, such as liquid wax. Therefore, the minimum temperature of the cooling medium cannot be lower than 100°C. Of course, for other high-temperature media, the user can adjust the temperature of the cooling medium according to the actual situation, which will not be repeated here.

[0084] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the marketplace, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein. The scope of the present disclosure is defined by the appended claims.

Claims

1. A conveying device, characterized in that: The conveying device comprises: A gear pump (1), wherein the gear pump (1) is configured to convey a conveying medium; Connecting frame (2); A magnetic coupling (3), wherein an isolation cover (32) of the magnetic coupling (3) is connected to the connecting frame (2) to form a chamber for accommodating an inner magnet (31) of the magnetic coupling (3), and a driving shaft (11) of the gear pump (1) passes through the connecting frame (2), extends into the chamber, and is connected to the inner magnet (31); The connecting frame (2) comprises: A sleeve (21), the sleeve (21) being configured to surround and rotatably support a driving shaft (11) of the gear pump (1), and being provided with a cooling medium cavity (211); A connecting flange (22), the connecting flange (22) surrounds the driving shaft (11) of the gear pump (1) and is configured to connect the sleeve (21) and the isolation cover (32) of the magnetic coupling (3), and the connecting flange (22) has an injection channel (224) and a liquid outlet channel (223), the injection channel (224) connects the injection interface (221) and the cooling medium cavity (211), the liquid outlet channel (223) connects the liquid outlet interface (222) and the cooling medium cavity (211), the cooling medium cavity (211) extends axially from one end to the other end of the sleeve (21), and the temperature of the conveying medium is higher than the temperature of the cooling medium.

2. The conveying device according to claim 1, characterized in that The conveying device also includes a sealing plug, which is detachably connected to the connecting flange (22) to seal the liquid injection interface (221) and the liquid outlet interface (222).

3. The conveying device according to claim 2, characterized in that: The sealing plug and the connecting flange (22) are connected via threads.

4. The conveying device according to claim 1, characterized in that The liquid injection channel (224) and the liquid outlet channel (223) extend in the radial direction of the connecting flange (22).

5. The conveying device according to claim 1, characterized in that: The outer peripheral wall of the sleeve (21) has a plurality of ribs arranged in sequence and spaced apart in the circumferential direction, and the ribs extend from the connecting flange (22) to the main housing of the gear pump (1), and the main housing is configured to accommodate two gears of the gear pump (1) that mesh with each other.

6. The conveying device according to claim 1, characterized in that: The conveying device also includes: Cooling medium storage tank; a cooling medium delivery pump, the cooling medium delivery pump being configured to deliver the cooling medium in the cooling medium storage barrel to the cooling medium cavity (211) via the liquid injection interface (221); A cooling medium recovery barrel is connected to the liquid outlet interface (222).

7. The conveying device according to claim 1, characterized in that The temperature of the conveying medium is 200°C to 150°C.

8. The conveying device according to claim 1, characterized in that: The temperature of the cooling medium is 120°C to 100°C.

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