A heat exchange device for a rotary sewage source heat pump

Abstract

The present invention provides a rotary sewage source heat pump heat exchange device, characterized in that it comprises: a shell (4), which is a cylindrical shell; a spiral chute (1), which is spirally arranged in the shell (4), the trough body of the spiral chute has an arc-shaped inner groove surface (11) as a sewage flow channel, and a working medium flow channel (12) is arranged below the inner groove surface; a rotary drive mechanism drives the shell and the spiral chute (1) to rotate synchronously. The technical solution of the present invention avoids or reduces the reduction of heat transfer efficiency caused by the deposition of pollutants in the sewage on the surface of the flow channel. In addition, the rotation mode will reduce the downward speed of the sewage, increase the heat exchange area, and enhance the disturbance in the radial direction of the flow channel, thereby improving the heat exchange efficiency and further reducing the possibility of deposition in the flow channel.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, in particular to a heat exchanger in an air conditioning system, and more specifically to a sewage source heat pump heat exchanger. Background Art

[0002] At present, the heat sources for winter heating in China are mainly coal and natural gas. China has a large population and a vast territory, which contributes greatly to the emission of carbon dioxide in the air. In addition, the use of coal will emit other air pollutants. For this reason, heat pump technology has received more and more attention.

[0003] Heat pump technology can be divided into soil source, water source, air source and combined heat pump according to the heat source. Among them, urban sewage source heat pump has the characteristics of warm in winter and cool in summer, small temperature change, stable water volume and large heat energy storage. At present, the average daily sewage discharge in cities in my country is more than 100 million tons. The use of sewage source heat pump has practical economic and social benefits.

[0004] At present, there are four main types of heat exchangers for sewage source heat pumps: immersed, plate, shower and shell and tube heat exchangers, all of which use clean water heat exchangers. Urban sewage is a mixed water body containing: domestic sewage, rainwater, industrial wastewater, etc. This mixture contains a variety of unknown suspended matter and complex chemicals, and cannot solve the blockage and scaling caused by sewage sources. Specifically, the presence of suspended matter and organic matter will seriously reduce the heat exchange performance of the heat exchanger. Suspended matter is prone to form cumulative precipitation, and organic matter forms compound precipitation. The two precipitates are attached to the pipe wall to produce fouling thermal resistance and reduce heat exchange performance. The sewage contains mud, debris, oil, bacteria, etc., which will corrode the pipe wall, and larger wastes can easily cause blockage of the heat exchanger. Summary of the invention

[0005] The object of the present invention is to provide a sewage source heat pump heat exchange device, which is used to solve the problems of pollutant deposition and blockage of flow channels in existing heat exchangers.

[0006] The sewage source heat pump heat exchange device according to the present invention comprises a shell, a spiral chute and a rotary drive mechanism. The shell is a cylindrical shell; the spiral chute is spirally arranged in the shell, the trough body of the spiral chute has an arc-shaped inner trough surface as a sewage flow channel, and a working medium flow channel is arranged below the inner trough surface; the rotary drive mechanism drives the shell and the spiral chute to rotate synchronously.

[0007] In a specific embodiment, the housing is provided with a stopper inwardly for limiting the relative movement with the spiral chute when rotating. In a specific embodiment, the stopper is a plurality of stopper rods.

[0008] In another embodiment, the stopper is a limiting groove provided corresponding to the turns of the spiral chute.

[0009] In one embodiment of the present invention, the rotary drive mechanism includes a turntable and a motor. The housing is placed on the turntable, and the turntable is provided with an annular groove at the position of the lower circumferential surface of the housing to be installed, and a plurality of stopper plates are arranged in the annular groove at intervals, and a plurality of slots for the stopper plates are provided on the lower circumferential surface of the housing, and after installation, the stopper plates are stuck in the slots. The motor is used to drive the turntable to rotate.

[0010] In another embodiment of the present invention, the heat exchange device further comprises a rotating shaft, which is disposed at the axis center of the spiral chute, and the rotating shaft is driven by a driving device to drive the spiral chute to rotate.

[0011] Furthermore, the sewage source heat pump heat exchange device also includes a chute fixing body, which is cylindrical, and the spiral chute is fixedly installed on the chute fixing body.

[0012] The heat exchange device of the present invention may further include a controller for controlling the rotation speed of the spiral chute.

[0013] As a preferred embodiment of the present invention, the heat exchange device can be arranged on a flexible base, and the flexible base further includes: a support plate for supporting the spiral chute and its mounting components; a spring connected to the support plate and located below the support plate; and a spring seat for supporting the spring.

[0014] Through the technical solution of the present invention, the sewage is continuously moved downward in the rotating chute with the help of gravity, resulting in the scouring of the flow channel surface, thus avoiding the reduction of heat transfer efficiency caused by the deposition of pollutants in the sewage on the flow channel surface. In addition, the rotating mode will reduce the downward speed of the sewage, increase the heat exchange area, and enhance the disturbance in the radial direction of the flow channel, thereby improving the heat exchange efficiency and further reducing the possibility of deposition in the flow channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematically shows some components used in the heat exchange device of the present invention, wherein the housing 4, the spiral chute 1 and other components are shown;

[0016] Figure 2 Given Figure 1 Schematic diagram of the spiral chute;

[0017] Figure 3 A cross-sectional view showing sewage distribution of the spiral chute used in the present invention in a stationary state;

[0018] Figure 4 A cross-sectional view showing sewage distribution of a spiral chute used in the present invention in a rotating state;

[0019] Figure 5 A schematic diagram of a flexible base for a heat exchange device of the present invention is shown. DETAILED DESCRIPTION

[0020] The following is a detailed description of embodiments of the present invention, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0021] like Figure 1 In the embodiment shown, the sewage source heat pump heat exchange device used in the present invention includes a housing 4 and a spiral chute 1. The housing 4 is a cylindrical shell, and a sewage chute is arranged spirally inside, which is referred to as the spiral chute 1 in this article. Figure 2-4 As shown, the trough body of the spiral chute has an arc-shaped inner trough surface as a sewage flow channel, and a working medium flow channel 12 is provided below the inner trough surface. The working medium flow channel shown in the figure is provided in the form of multiple parallel arranged thin tubes. An alternative is to provide an integral working medium flow channel, in other words, to provide an integral cavity below the inner trough surface, which serves as a flow channel for the heat exchange medium.

[0022] In the present invention, due to the provision of the spiral chute 1, the sewage entering from the inlet 5 flows from top to bottom through the arc-shaped inner chute surface 11, and exchanges heat with the heat transfer medium flowing from bottom to top through the working medium flow channel 12. The spiral flow of the sewage has a continuous flushing effect on the inner chute surface, thereby preventing the debris in the sewage from staying and being deposited in the flow channel.

[0023] Another important feature of the present invention is that a rotary drive mechanism is provided to drive the spiral chute 1 to rotate. Under the action of the rotary force, the sewage in the inner chute surface 11 is "flattened" in the flow channel, increasing the heat exchange area between the sewage and the heat transfer medium in the working medium flow channel. Figure 3 and Figure 4 The difference between the effects of the spiral chute 1 in the static and rotating states is shown. During rotation, due to the centrifugal force, the downward flow rate of the liquid can be slowed down, thereby extending the heat exchange time. In addition, the sewage disturbance caused by the rotation can also significantly increase the heat transfer efficiency.

[0024] There are many ways to fix the spiral chute 1 to achieve stable rotation. Figure 1 The embodiment shown is provided with a rotating shaft 3, which is driven by a driving device (not shown in the figure). A chute fixing body 2 is fixed around the rotating shaft, which is also a cylindrical body, and its outer circumference is fixedly connected to the spiral chute 1. The chute fixing body 2 and the rotating shaft can be fixedly connected by a plurality of connecting rods (not shown). As a variation, the cylindrical chute fixing body can also be omitted, and the rotating shaft 3 and the spiral chute 1 can be directly fixedly connected by other components.

[0025] It is easy for people skilled in the art to think of a variety of ways to achieve rotational drive, for example, by engaging the upper end or the lower end of the rotating shaft with a driving gear fixed to the motor, or by driving the rotation of the rotating shaft through a belt.

[0026] In this embodiment, the outer shell 4 is detachable, and when necessary, the outer shell is removed to clean the inner surface of the spiral chute 1. When driven to rotate by the aforementioned rotating shaft, the outer shell 4 may not rotate with the spiral chute, but only serve as a stationary shell to play a role in heat insulation and odor isolation.

[0027] In another embodiment, the rotating shaft can be avoided by trying to keep the shell 4 and the spiral chute 1 rotating synchronously during rotation. To this end, the outer diameter of the spiral chute is selected to adapt to the inner diameter of the shell 4, and then a number of stoppers are provided inwardly of the shell 4, such as protrusions or stopper rods integrally formed with the shell, or limit grooves provided corresponding to the turns of the spiral chute. The stopper is stuck in the turns of the spiral chute to limit the relative displacement between the shell and the spiral chute in the radial direction. The stopper also drives the spiral chute 1 to move when the shell rotates, and is also a component for transmitting the rotation driving force.

[0028] When the shell 4 has the aforementioned stopper, the shell can be made into two semi-cylindrical parts in order to realize the detachability of the shell 4. During installation, they are matched together, locked and then rotated appropriately so that the stopper blocks the spiral chute.

[0029] In an embodiment of the present invention not shown in the figure, the rotary drive mechanism includes a turntable and a motor. The housing is placed on the turntable, and the turntable is adaptively provided with an annular groove at the position of the lower circumferential surface of the housing to be installed, and a plurality of stop plates are arranged in the annular groove at intervals, and a plurality of slots are provided for the stop plates on the lower circumferential surface of the housing, and after installation, the stop plates are stuck in the slots. In this way, through the matching relationship between the slots and the stop plates, the turntable driven by the motor to rotate transmits the rotational force to the housing, and finally the housing drives the spiral chute to move through the stopper.

[0030] In a preferred embodiment of the present invention, the heat exchange device further comprises a speed regulating device, which is used to regulate the speed of the spiral chute, such as accelerating, decelerating, starting rotation and stopping rotation. As a further preferred embodiment, a microprocessor can be provided for the speed regulating device, and a predetermined algorithm is placed in the microprocessor so that the spiral chute changes speed according to a set rule. Such speed change is advantageous, and can increase the disturbance of the sewage to the pollutant, especially the disturbance of the sewage in the radial direction of the chute, and reduce the deposition of pollutants on the inner chute surface.

[0031] As another way to add disturbance, such as Figure 5As shown, the heat exchange device is arranged on a flexible base, in which a support plate 61 is used to support the spiral chute 1 and its mounting assembly; a spring 62 is connected to the support plate 61 and is located below the support plate 61; and a spring seat 63 supports the spring 62. In the embodiment shown in the figure, the spring 62 and the support plate 61 are fixedly connected by an adjusting screw 64. The flexibility of the flexible base can be adjusted by moving the adjusting screw up and down. In the present invention, the flexible base is proposed to induce micro-vibration caused by rotational imbalance of the equipment, and the micro-vibration is conducive to enhancing heat exchange.

[0032] The technical solutions of the present invention are explained in detail above with the help of typical embodiments. These embodiments are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rotary sewage source heat pump heat exchange device, characterized in that: include: The housing (4) is a cylindrical shell. A spiral chute (1) is spirally arranged in the housing (4); the chute body of the spiral chute has an arc-shaped inner chute surface (11) serving as a sewage flow channel; a working fluid flow channel (12) is provided below the inner chute surface; the working fluid flow channel is of an integral type or a capillary type. A rotary drive mechanism drives the spiral chute (1) to rotate. The rotating shaft (3) is located at the axis center of the spiral chute. The rotating shaft (3) is driven by the rotating drive mechanism to drive the spiral chute to rotate. a chute fixed body (2) which is cylindrical, the spiral chute (1) being fixedly mounted on the chute fixed body (2), and A controller for controlling the rotation speed of the spiral chute, The sewage entering from the inlet (5) flows from top to bottom through the arc-shaped inner groove surface (11), and exchanges heat with the heat transfer medium flowing from bottom to top through the working fluid flow channel (12). Under the action of the rotational force, the sewage in the inner groove surface (11) is flattened in the flow channel, thereby increasing the heat exchange area between the sewage and the heat transfer medium in the working fluid flow channel.

2. The sewage source heat pump heat exchange device according to claim 1, characterized in that: Also included is a flexible base (6), which further comprises: A support plate (61) for supporting the spiral chute and its mounting components; A spring (62) connected to the support plate (61) and located below the support plate (61); A spring seat (63) supports the spring (62).

3. The sewage source heat pump heat exchange device according to claim 2, characterized in that: The support plate (61) and the spring are connected via an adjusting screw (64), and the adjusting screw adjusts the distance between the spring and the support plate.

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