GB2127951A

GB2127951A - Heat exchangers

Info

Publication number: GB2127951A
Application number: GB08222012A
Authority: GB
Inventors: Karsten Laing; Oliver Laing; Ludwig Ludin
Original assignee: Individual
Current assignee: Individual
Priority date: 1982-07-30
Filing date: 1982-07-30
Publication date: 1984-04-18
Also published as: GB2127951B

Abstract

The heat exchanger comprises a pump (11) having an impeller and a housing (10) containing a heat transfer pipe (8). The pump serves for transporting a fluid to be heated from an inlet (4) to an outlet (5). The heat transfer pipe (8), which is connected to an inlet (1) and an outlet (3), is so arranged that its heat emitting surface is exposed to the whirl (14) produced by the pump impeller. The heat exchanger may be incorporated in a condenser of a heat pump. <IMAGE>

Description

SPECIFICATION Heat transfer pump The invention miates to a pump for the circulation of liquid which pump contains heat transfer elements.

The heattransfer means of the type liquid-to-liquid are generally made as pipe coilsthrough which is forced the heat transfer liquid at as high a velocity as possible to achieve high heat transfer parameters. Such heat transfer circuits have therefore a high hydrualic resistance so thatthey require high pumping pressures. Proportionally with the pumping pressure raises also the necessary motor output and with ittheyearly consumption ofelectriccurrent. Because heattransfer means are often used particularly in heating equipment, in which they are often in operation the whole year round this leads to significant energy costs.

The invention avoids these energy costs resulting from friction in pipes in thatthe heat transfer means is provided in the pump housing. In this way are usefully used the unavoidable losses due to whirl, which every centrifugal pump has, because the whirl also causes increase in the convective heattransfer on the heat emitting side of the heat transmitting pipes. This makes in addition, a separate heat transfer housing unnecessary. Afurther improvement of the heat transfer is obtained in that the heattransfer means are made with aflatcross-section. Forthis purpose is made, according to the invention, a pipe coil from a circular pipe by conventional manufacturing methods.Then the pipe coil is axially compressed whereby all pipes acquire uniformly a cross-section in the form of a rounded oblong, whereupon the pipe coil is again slightly extended in axial direction. In the same pump space may be arranged a significantly larger surface.

The invention will be explained in more detail with reference to figures.

Figure 1 shows, in longitudinal section, a pump according to the invention in which heating water is forced through a pipe coil arranged in the cylindrical outlet space of the pump.

Figure 2 shows, in longitudinal section, an arrangement in which the pipe coil is arranged in the suction ofthe pump.

Figure 3 shows a section along line Ill-Ill.

Figure 4 shows method step for the manufacture of the coil.

Figure 5 shows a condenserfor heat pumps.

Figure 1 shows a pump according to the invention in longitudinal section. Water of the heating circuit, which is circulated by a heating pump, enters pipe 1 and flows through the pipe coils 2, which it leaves through the pipe 3. The pipe coils are arranged concentrically in a cylindrical pump housing 10 near the outer periphery thereof, so that a cylindrical inner space 12 is left free. The large-surface heating is connected with the pump 11 or 11' by pipes 4 and 5.

The velocity of flow of water in the pipe and at its surface is 0.5 to 3 mls, because in spite of the large cross-section of the housing iGa targe relative velocity parallel to the pipes 8 is produced, because the pump impeller is so arranged that the outlet whirl 14 spreads along the coil 8 which is twisted in the same direction. By the high relative velocity of the liquid in the cylindrical space 12 relative to the coil pipes 2 is ensured a high heat transfer.

In the embodiment according Figure 2 the suction region 17 ofthe impeller 6' communicates with the inside ofthe housing 10 and produces in this manner on the suction side a whirl flow 16.

In Figure3 is illustrated a cross-section along line Ill-Ill in Figure 1, from which is apparentthe embodiment of the suction pipe 4', which is also helical for adaptation to the flow. The suction pipe may, however, also form a unit with the bottom region 19 of the pump housing 10. In this case all connections 1,3,4 and 5 should passthrough the bottom.

In order to control the temperature a valve 18 may be provided in the primary circuit. Another kind of regulation consists in that the pump motor is driven intermittently while the impulse-pause ratio equals one only atthe nominal output and decreases with a reduction in the actual heat consumption. The length ofthe impulse is preferably so chosen that the water contents of the hollow body forming the large-surface heating is always exchanged. In order to simplyfy filling, a non-return valve 20 is situated downstream of the outlet pipe 5 sothatwaterentering through the port piece 21 flows through the large-surface heating.

Figure 4 shows a device in which two formpieces40 and 41 are inserted under a press (not shown) and deform the pipe of the pipe coil 42 to the shape43.

After being removed from the device the pipe coil which has been flattened must be to a small extent axially spread to obtain spacing between adjacent turns.

Figure 5 shows anotherembodimentwhich is particularly suitable as a condenserfor air-water heat pumps. The pump motor 50 is arranged in a sleeve 51 which is with respect to the water side sealed by a partition 52. The impeller 53 forms a rotatable unit with a ring-shaped magnet 54. The impeller is pressed bytheforce of the permanent magnets against a bearing ball 55. The waterto be heated enters through the pipe 56, the heat transfer means 57 being arranged in the region of the outlet vortex of the pump impeller 53. Between the cylinder 58 and the housing 59 is formed an annual space 60 which merges into a collection space 61. With this connection space communicates an outlet port piece 62. The heat transfer means pipe 57 passes at the bottom 63 through the wall ofthe housing 59. In the same sleeve 51 may be situated a second motor 67, the rotor of which drives a wheel disc 65 which merges into wings 66 and forms in thiswayan axial fan forthe evaporator (not shown) of the heat pump. The whole loss heat of the motors 50 and 67 is transferred to the utility water via the sleeve 51. Ifthe apparatus is used as a desuperheaterfor utilizing heat from hot steam in cooling devices, the motor 67 is not needed.

CLAIMS (Filed on 15.7.83) 1. Acirculation pumpforafluid heatcarrierfor

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Heat transfer pump The invention miates to a pump for the circulation of liquid which pump contains heat transfer elements. The heattransfer means of the type liquid-to-liquid are generally made as pipe coilsthrough which is forced the heat transfer liquid at as high a velocity as possible to achieve high heat transfer parameters. Such heat transfer circuits have therefore a high hydrualic resistance so thatthey require high pumping pressures. Proportionally with the pumping pressure raises also the necessary motor output and with ittheyearly consumption ofelectriccurrent. Because heattransfer means are often used particularly in heating equipment, in which they are often in operation the whole year round this leads to significant energy costs. The invention avoids these energy costs resulting from friction in pipes in thatthe heat transfer means is provided in the pump housing. In this way are usefully used the unavoidable losses due to whirl, which every centrifugal pump has, because the whirl also causes increase in the convective heattransfer on the heat emitting side of the heat transmitting pipes. This makes in addition, a separate heat transfer housing unnecessary. Afurther improvement of the heat transfer is obtained in that the heattransfer means are made with aflatcross-section. Forthis purpose is made, according to the invention, a pipe coil from a circular pipe by conventional manufacturing methods.Then the pipe coil is axially compressed whereby all pipes acquire uniformly a cross-section in the form of a rounded oblong, whereupon the pipe coil is again slightly extended in axial direction. In the same pump space may be arranged a significantly larger surface. The invention will be explained in more detail with reference to figures. Figure 1 shows, in longitudinal section, a pump according to the invention in which heating water is forced through a pipe coil arranged in the cylindrical outlet space of the pump. Figure 2 shows, in longitudinal section, an arrangement in which the pipe coil is arranged in the suction ofthe pump. Figure 3 shows a section along line Ill-Ill. Figure 4 shows method step for the manufacture of the coil. Figure 5 shows a condenserfor heat pumps. Figure 1 shows a pump according to the invention in longitudinal section. Water of the heating circuit, which is circulated by a heating pump, enters pipe 1 and flows through the pipe coils 2, which it leaves through the pipe 3. The pipe coils are arranged concentrically in a cylindrical pump housing 10 near the outer periphery thereof, so that a cylindrical inner space 12 is left free. The large-surface heating is connected with the pump 11 or 11' by pipes 4 and 5. The velocity of flow of water in the pipe and at its surface is 0.5 to 3 mls, because in spite of the large cross-section of the housing iGa targe relative velocity parallel to the pipes 8 is produced, because the pump impeller is so arranged that the outlet whirl 14 spreads along the coil 8 which is twisted in the same direction. By the high relative velocity of the liquid in the cylindrical space 12 relative to the coil pipes 2 is ensured a high heat transfer. In the embodiment according Figure 2 the suction region 17 ofthe impeller 6' communicates with the inside ofthe housing 10 and produces in this manner on the suction side a whirl flow 16. In Figure3 is illustrated a cross-section along line Ill-Ill in Figure 1, from which is apparentthe embodiment of the suction pipe 4', which is also helical for adaptation to the flow. The suction pipe may, however, also form a unit with the bottom region 19 of the pump housing 10. In this case all connections 1,3,4 and 5 should passthrough the bottom. In order to control the temperature a valve 18 may be provided in the primary circuit. Another kind of regulation consists in that the pump motor is driven intermittently while the impulse-pause ratio equals one only atthe nominal output and decreases with a reduction in the actual heat consumption. The length ofthe impulse is preferably so chosen that the water contents of the hollow body forming the large-surface heating is always exchanged. In order to simplyfy filling, a non-return valve 20 is situated downstream of the outlet pipe 5 sothatwaterentering through the port piece 21 flows through the large-surface heating. Figure 4 shows a device in which two formpieces40 and 41 are inserted under a press (not shown) and deform the pipe of the pipe coil 42 to the shape43. After being removed from the device the pipe coil which has been flattened must be to a small extent axially spread to obtain spacing between adjacent turns. Figure 5 shows anotherembodimentwhich is particularly suitable as a condenserfor air-water heat pumps. The pump motor 50 is arranged in a sleeve 51 which is with respect to the water side sealed by a partition 52. The impeller 53 forms a rotatable unit with a ring-shaped magnet 54. The impeller is pressed bytheforce of the permanent magnets against a bearing ball 55. The waterto be heated enters through the pipe 56, the heat transfer means 57 being arranged in the region of the outlet vortex of the pump impeller 53. Between the cylinder 58 and the housing 59 is formed an annual space 60 which merges into a collection space 61. With this connection space communicates an outlet port piece 62. The heat transfer means pipe 57 passes at the bottom 63 through the wall ofthe housing 59.In the same sleeve 51 may be situated a second motor 67, the rotor of which drives a wheel disc 65 which merges into wings 66 and forms in thiswayan axial fan forthe evaporator (not shown) of the heat pump. The whole loss heat of the motors 50 and 67 is transferred to the utility water via the sleeve 51. Ifthe apparatus is used as a desuperheaterfor utilizing heat from hot steam in cooling devices, the motor 67 is not needed. CLAIMS (Filed on 15.7.83)

1. Acirculation pumpforafluid heatcarrierfor transporting said heat carrierthrough heat transfer means, wherein the heat transfer means is arranged in a pump housing and on its heat emitting surface is exposed to the whirl ofthe pump impeller.

2. A circulation pump according to Claim 1, wherein the outlet side ofthe pump impeller communicates with the inside of the housing, and the outletwhirl is utilised.

3. A circulation pump according to Claim 1, wherein the suction side ofthe pump impeller communicates with the inside of the housing, and the inlet whirl is utilised.

4. A circulation pump according to any one of Claims 1 to 3, wherein the heat transfer means include a pipe coil made from a pipe of circular cross-section caused by axial compression of the coil, to assume flatter cross-section and subsequently to a small extent axially spread to obtain a space between the individual turns.

5. A circulation pump constructed, arranged and adapted to operate substantially as herein described with reference to, and as shown in, any of the Figures of the accompanying diagrammatic drawings.