Heat exchange system with rubber ball backwashing function

Abstract

The invention discloses a sewage heat exchange system with a rubber ball backwashing function. The sewage heat exchange system comprises a heat exchange system, a rubber ball cleaning system, a backwashing system and a control system, the control system opens the first valve and the second valve and closes the third valve, the fourth valve, the tap water inlet valve, the pump, the seventh valve, the eighth valve, the fifth valve, the ball adding device, the rubber ball counter, the rubber ball storage chamber, the rubber ball cleaner, the sixth valve and the ninth valve. Sewage and intermediary water enter the spiral heat exchange channel for indirect heat exchange; the stirring paddle rotates along with fluid flowing; if the pressure difference signal of the differential pressure transmitter is monitored to be greater than a normal value, the operation mode is switched to a backwashing state; entering a rubber ball cleaning state until the pressure difference value is in a normal state when the flushing still cannot run; the sewage heat exchange system can be subjected to online cleaning and automatic decontamination, the problem that the heat exchange performance is low due to the fact that a heat exchanger is blocked by sundries or scaling is caused is solved, the heat exchange effect is effectively improved, the service life of equipment is prolonged, and the sewage treatment and heat energy recovery efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of heat exchange equipment for sewage treatment, and in particular relates to a sewage heat exchange system with a high-efficiency cleaning function. Background Art

[0002] With the improvement of environmental awareness and the increasing severity of energy problems, sewage treatment and heat recovery have become important issues. Traditional sewage heat exchangers are prone to accumulate dirt in the long-term operation process. As the operation cycle increases, it will not only increase the resistance of the system operation, but also reduce the heat transfer efficiency. In severe cases, it may even block the heat exchanger, affect the heat exchange effect, and even cause equipment damage. Therefore, it is of great significance to develop a sewage heat exchanger device that can automatically clean and maintain the heat exchange effect. Summary of the invention

[0003] In order to overcome the above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a sewage heat exchange system with an efficient cleaning function, which solves the technical problem that the heat exchanger in the prior art is prone to accumulate dirt and has the characteristics of energy saving and environmental protection.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the present invention is: a heat exchange system with a rubber ball backwashing function, including a filter and a PLC controller, the filter is connected to one end of valve one, and the other end of valve one is connected to the first end of three-way one; the second end of three-way one is connected to the first end of differential pressure transmitter; the second end of differential pressure transmitter is connected to the first end of three-way two; the second end and the third end of three-way two are respectively connected to sewage inlet one and sewage inlet two of spiral heat exchanger; a sewage outlet is provided at the right end of the spiral heat exchanger; the spiral heat exchanger is connected to the first end of three-way three, the second end of three-way three, and valve two in sequence through the sewage outlet, and valve two is connected to the culvert through a pipeline; intermediate water inlet one and intermediate water inlet two are respectively arranged at the lower part of the spiral heat exchanger, and an intermediate water outlet is provided at the left end of the spiral heat exchanger; the third end of three-way one is connected downward to valves three and three The second end of the four-way, valve four, the first end of the five-way, the second end of the five-way and the pump are connected; the pump is also connected to the first end of the six-way through a pipeline, the second end of the six-way is connected to the five-way, the ball adding device, the rubber ball counter, and the rubber ball storage chamber in sequence through a pipeline, and the rubber ball storage chamber is also connected to the rubber ball cleaner; the lower side of the rubber ball cleaner is connected to the underground channel through a sewage pipe; the outlet end of the rubber ball storage chamber is connected to the six-way and one end of the seven-way through a pipeline in sequence; the third end of the six-way is connected to the seven-way, the eight-way and the third end of the seven-way through a pipeline in sequence; the second end of the seven-way is connected to the nine-way and the three-way through a pipeline in sequence; the third end of the four-way is connected to one end of the ten-way, and the other end of the ten-way is connected to the underground channel through a pipeline; one end of the tap water inlet valve is connected to the third end of the five-way, and the other end of the tap water inlet valve is connected to the tap water source.

[0005] The filter, spiral heat exchanger, valve one, tee one, differential pressure transmitter, tee two, tee three and valve two form a heat exchange system.

[0006] The tap water inlet valve, pump, tee six, valve seven, valve eight, tee seven, valve nine, spiral heat exchanger, tee two, differential pressure transmitter, tee one, valve three, tee four and valve ten constitute a backwashing system.

[0007] The pump, tee six, valve five, ball adding device, rubber ball counter, rubber ball storage chamber, rubber ball cleaning device, valve six, tee seven, valve nine, tee three, spiral heat exchange channel, tee two, pressure difference transmitter, tee one, valve three, tee four, valve four, tee five constitute a rubber ball cleaning system.

[0008] The PLC controller is electrically connected to the wiring terminals of valve one, valve two, valve three, valve four, valve five, valve six, valve seven, valve ten, a differential pressure transmitter, a tap water inlet valve, a pump, a ball adding device, a rubber ball counter, a rubber ball storage chamber, and a rubber ball washer to form a control system.

[0009] The spiral heat exchanger comprises a sewage inlet 1, a sewage inlet 2, a sewage outlet, an intermediate water inlet 1, an intermediate water inlet 2, an intermediate water outlet, a shell, a spiral heat exchange channel, a stirring paddle and an end cover; the inner cavity wall of the spiral heat exchanger shell is provided with a spiral heat exchange channel along the circumferential direction, and a stirring paddle is provided in the central channel surrounded by the spiral heat exchange channel; the spiral heat exchanger is a cylinder and is arranged horizontally; one end of the spiral heat exchanger is connected to the intermediate water outlet, and the other end is connected to the sewage outlet; the spiral heat exchange channel is composed of a series of parallel arranged spiral plates, and the cold and hot fluids flow alternately through the spiral indirect heat exchange channel composed of the spiral plates; the spiral heat exchanger A sewage inlet one and a sewage inlet two are respectively provided at the left and right ends of the upper side of the channel, and an intermediate water inlet one and an intermediate water inlet two are respectively provided at the left and right ends of the lower side of the spiral heat exchange channel; two sewage inlet pipes are connected to the sewage inlet channel of the spiral heat exchange channel, and the sewage in the spiral heat exchange channel is discharged from the sewage outlet; the intermediate water inlet one and the intermediate water inlet two are connected to the intermediate water channel of the spiral heat exchange channel, and the other end of the intermediate water channel of the spiral heat exchange channel is connected to the intermediate water outlet; the spiral heat exchange channel is made of corrosion-resistant and bacteria-resistant stainless steel; a stirring paddle is installed in the center of the spiral heat exchanger; an end cover is respectively provided at the left and right ends of the spiral heat exchanger.

[0010] The beneficial effects of the present invention are: The rubber ball cleaning system and backwashing system can automatically and efficiently clean the inside of the heat exchanger to maintain the heat exchange effect and extend the service life of the equipment.

[0011] The control system realizes automatic control of the device, which is easy to operate, safe and reliable.

[0012] The present invention is applicable to various sewage treatment and heat recovery fields, such as industrial wastewater treatment, domestic sewage treatment, thermal power plant wastewater recovery, etc. At the same time, it can also be used in other occasions requiring automatic cleaning and heat exchange. It is particularly suitable for sewage treatment and heat recovery fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is the working principle diagram of the sewage heat exchange system with backwashing function.

[0014] Figure 2 This is the structural diagram of the spiral sewage heat exchanger device.

[0015] Figure 3 It is a cross-sectional view of the spiral sewage heat exchanger device.

[0016] Figure 4 This is the PLC control schematic diagram.

[0017] In the figure: 1-filter, 2-valve one, 3-three-way one, 4-three-way two, 5-spiral heat exchanger, 6-three-way three, 7-valve two, 8-underground channel, 9-tap water inlet valve, 10-valve three, 11-three-way four, 12-valve four, 13-three-way five, 14-pump, 15-three-way six, 16-valve seven, 17-valve eight, 18-three-way seven, 19-valve nine, 20-valve five, 21-ball adding device, 22-rubber ball counter , 23-rubber ball storage chamber, 24-rubber ball cleaner, 25-valve six, 26-sewage inlet one, 27-sewage inlet two, 28-sewage outlet, 29-intermediate water inlet one, 30-intermediate water inlet two, 31-intermediate water outlet, 32-shell, 33-spiral heat exchange channel, 34-stirring paddle, 35-end cover, 36-valve ten, 37-differential pressure transmitter, 38-drain valve, 39-PLC controller. DETAILED DESCRIPTION

[0018] The structural principle and working principle of the present invention are further described in detail below in conjunction with the accompanying drawings and embodiments.

[0019] The object of the present invention is to provide a heat exchange system with a rubber ball backwashing function, comprising a filtering device, a spiral heat exchanger body, a rubber ball cleaning system, a backwashing system and a control system.

[0020] A heat exchange system with a rubber ball backwashing function, comprising a filter 1 and a PLC controller 28, the filter 1 is connected to one end of a valve 2, the other end of the valve 2 is connected to the first end of a tee 3; the second end of the tee 3 is connected to the first end of a differential pressure transmitter 37; the second end of the differential pressure transmitter 37 is connected to the first end of a tee 4; the second end and the third end of the tee 2 are respectively connected to the sewage inlet 1 26 and the sewage inlet 2 27 of the spiral heat exchanger; the right end of the spiral heat exchanger 5 is provided with There is a sewage outlet 28; the spiral heat exchanger 5 is connected to the first end of the tee 3 6, the second end of the tee 3 6, and the valve 2 7 in sequence through the sewage outlet 28, and the valve 7 is connected to the culvert 8 through a pipeline; the intermediate water inlet 1 29 and the intermediate water inlet 2 30 are respectively arranged at the lower part of the spiral heat exchanger 5, and the left end of the spiral heat exchanger 5 is provided with an intermediate water outlet 31; the third end of the tee 1 3 is downwardly connected to the valve 3 10, the second end of the tee 4 11, the first end of the tee 4 11, the valve 4 12, the culvert 8 The first end of the five-way 13, the second end of the three-way five 13 and the pump 14 are connected; the pump 14 is also connected to the first end of the three-way six 15 through a pipeline, and the second end of the three-way six 15 is connected to the valve five 20, the ball adding device 21, the rubber ball counter 22, and the rubber ball storage chamber 23 through a pipeline in sequence, and the rubber ball storage chamber 23 is also connected to the rubber ball cleaner 24; the lower side of the rubber ball cleaner 24 is connected to the culvert through a sewage pipe; the outlet end of the rubber ball storage chamber 23 is connected to the valve six 25, the three-way seven 18 through a pipeline in sequence one end of the three-way valve 6 15 is connected; the third end of the three-way valve 6 15 is connected with the third ends of the valve 7 16, the valve 8 17 and the three-way valve 7 18 in sequence through a pipeline; the second end of the three-way valve 7 18 is connected with the third ends of the valve 9 19 and the three-way valve 6 in sequence through a pipeline; the third end of the three-way valve 4 11 is connected with one end of the valve 10 36, and the other end of the valve 10 36 is connected with the culvert 8 through a pipeline; one end of the tap water inlet valve 9 is connected with the third end of the three-way valve 5 13, and the other end of the tap water inlet valve 9 is connected to the tap water source.

[0021] The filter 1, spiral heat exchanger 5, valve 1 2, tee 1 3, differential pressure transmitter 37, tee 2 4, tee 3 6 and valve 2 7 constitute a heat exchange system.

[0022] The tap water inlet valve 9, pump 14, tee six 15, valve seven 16, valve eight 17, tee seven 18, valve nine 19, spiral heat exchanger 5, tee two 4, differential pressure transmitter 37, tee one 3, valve three 10, tee four 11, valve ten 36 and culvert 8 constitute a backwashing system.

[0023] The pump 14, three-way six 15, valve five 20, ball adding device 21, rubber ball counter 22, rubber ball storage chamber 23, rubber ball cleaning device 24, valve six 25, three-way seven 18, valve nine 19, three-way three 6, spiral heat exchange channel 33, three-way two 4, differential pressure transmitter 37, three-way one 3, valve three 10, three-way four 11, valve four 12, three-way five 13 constitute a rubber ball cleaning system. When the cleaning effect of backwashing is not good, the rubber ball cleaning system is started.

[0024] The PLC controller 28 is electrically connected to the wiring terminals of valve 1 2, valve 2 7, valve 3 10, valve 4 12, valve 5 20, valve 6 5, valve 7 16, valve 10 36, differential pressure transmitter 37, tap water inlet valve 9, pump 14, ball adding device 21, rubber ball counter 22, rubber ball storage chamber 23, and rubber ball cleaner 24 to form a control system.

[0025] The spiral heat exchanger 5 comprises a sewage inlet 1 26, a sewage inlet 27, a sewage outlet 28, an intermediate water inlet 1 29, an intermediate water inlet 2 30, an intermediate water outlet 31, a shell 32, a spiral heat exchange channel 33, a stirring paddle 34 and an end cover 35; the inner cavity wall of the spiral heat exchanger shell is provided with a spiral heat exchange channel 33 along the circumferential direction, and a stirring paddle 34 is provided in the central channel surrounded by the spiral heat exchange channel 33; the spiral heat exchanger 5 is a cylinder and is arranged horizontally; one end of the spiral heat exchanger is connected to the intermediate water outlet 31, and the other end is connected to the sewage outlet 28; the spiral heat exchange channel is composed of a series of parallel spiral plates, and the cold and hot fluids flow alternately through the spiral heat exchange channel 33 composed of the spiral plates; the spiral heat exchange channel 33 A sewage inlet 1 26 and a sewage inlet 27 are respectively provided at the left and right ends of the upper side, and an intermediate water inlet 1 29 and an intermediate water inlet 2 30 are respectively provided at the left and right ends of the lower side of the spiral heat exchange channel 33; two sewage inlet pipes are connected to the sewage inlet channel of the spiral heat exchange channel 33, and the sewage in the spiral heat exchange channel 33 is discharged from the sewage outlet 28; the intermediate water inlet 1 29 and the intermediate water inlet 2 30 are connected to the intermediate water channel of the spiral heat exchange channel 33, and the other end of the intermediate water channel of the spiral heat exchange channel 33 is connected to the intermediate water outlet 31; the overall material of the spiral heat exchange channel 33 is corrosion-resistant and bacteria-resistant stainless steel material; a stirring paddle 34 is installed in the center of the spiral heat exchanger 5; an end cover 35 is respectively provided at the left and right ends of the spiral heat exchanger 5.

[0026] The working principle of the present invention is: First, sewage enters the sewage side of the spiral heat exchange channel 33 from sewage inlet 1 26 and sewage inlet 2 27, and intermediate water enters the intermediate water side of the spiral heat exchange channel 33 from intermediate water inlet 1 29 and intermediate water inlet 2 30. Sewage and intermediate water are indirectly heat exchanged in the spiral heat exchange channel 33. In order to prevent blockage, a heat exchange channel with a larger flow area is selected. The stirring paddle 34 in the center of the heat exchanger rotates with the flow of the fluid, which can change the flow trend of the fluid, reduce the thickness of the boundary layer, enhance heat transfer and alleviate scaling of the inner wall, thereby ensuring the heat exchange effect of the spiral heat exchanger. Finally, the end covers 35 at both ends can be opened to facilitate equipment cleaning and simple maintenance.

[0027] The stirring paddle is installed at the center of the spiral heat exchanger 5. The rotation directions of two adjacent stirring paddles 34 are opposite. When the medium flows, they rotate in opposite directions, which can increase disturbance and enhance heat transfer.

[0028] The heat exchange system includes sewage flowing into the filter 1, the filter 1 is connected with the spiral heat exchanger 5 through the sewage inlet 1 26 and the sewage inlet 2 27; after the sewage exchanges heat in the spiral heat exchanger 5, it flows out of the spiral heat exchanger through the sewage outlet 28; the sewage in the spiral heat exchanger 5 flows into the culvert 8 through the sewage outlet 28, the three-way valve 3 6 and the valve 2 7; the intermediate water enters the spiral heat exchanger 5 through the intermediate water inlet 1 29 and the intermediate water inlet 2 30, and flows out through the intermediate water outlet 31 after the heat exchange is completed.

[0029] The backwashing system includes a tap water inlet valve 9, which is connected to a pump 14, a tee 6 15, a valve 7 16, a valve 8 17, a tee 7 18, a valve 9 19, and a spiral heat exchanger 5 in sequence through a pipeline; the tap water is pressurized by the pump 14 from the tap water inlet valve 9, and flows through the tee 6 15, the valve 7 16, the valve 8 17, the tee 7 18, the valve 9 19, the tee 3 6, and the spiral heat exchanger 5 in sequence, and enters the spiral heat exchanger 5 from the sewage outlet 28, and the reverse water flow flushes the pipe wall of the spiral heat exchanger, and the dirt is flushed out from the sewage inlet 1 26 and the sewage inlet 2 27, so as to achieve the effect of decontamination; the sewage inlet 1 26 and the sewage inlet 2 27 are connected to the tee 2 4, the pressure differential transmitter 37, the tee 1 3, the valve 3 10, the tee 4 11, and the valve 10 36 in sequence through a pipeline, and the backwashing water flows into the culvert 8. The backwash system operates intermittently.

[0030] The rubber ball cleaning system includes a pump 14 connected to a three-way six 15, a valve five 20, a ball adding device 21, a rubber ball counter 22, a rubber ball storage chamber 23 and a rubber ball cleaning device 24 in sequence through a pipeline, and the rubber ball storage chamber 23 is connected to a valve six 25, a three-way seven 18, a valve nine 19, a three-way three 6, and a spiral heat exchange channel 33 in sequence through a pipeline; the rubber balls are transported from the rubber ball storage chamber 23 by the pump 14, and the rubber balls roll in the pipeline with the water flow and enter the sewage outlet 28 of the spiral heat exchanger 5, and the sewage side of the spiral heat exchange channel 33 is removed. Dirt on the channel wall; after cleaning, the rubber balls flow with the water through T-joint 2 4, differential pressure transmitter 37, T-joint 1 3, valve 3 10, T-joint 4 11, valve 4 12 and T-joint 5 13 in turn, and pass through pump 14 again; the rubber balls flow through rubber ball counter 22, line up in a row and pass through capacitive sensor in turn, and the returning balls are counted by the capacitive sensor and collected by the collection net of rubber ball storage chamber 23 until all rubber balls are confirmed to be recovered and wait for the next use; a high-pressure nozzle is provided in the rubber ball cleaner 24 to effectively clean the rubber balls.

[0031] The control system includes a controller 39 such as a PLC, which is electrically connected to the following controlled devices, including: valve 1 2, valve 2 7, valve 3 10, valve 4 12, valve 5 20, valve 6 25, valve 7 16, valve 10 36, differential pressure transmitter 37, tap water inlet valve 9, pump 14, ball adding device 21, rubber ball counter 22, rubber ball storage chamber 23, rubber ball cleaning device 24. The automatic control of the device is achieved through controllers such as PLC. The control system controls the operation of the rubber ball cleaning system and the backwashing system according to preset parameters or real-time monitoring data to ensure that the device is always in the best working state.

[0032] When the differential pressure transmitter 37 detects that the inlet and outlet pressure difference of the spiral heat exchanger 5 is within the normal safety value range, the entire system is in normal heat exchange conditions, and the PLC controller sends control signal No. 1: open valve one 2 and valve two 7, and close valve three 10, valve four 12, tap water inlet valve 9, pump 14, valve seven 16, valve eight 17, valve five 20, ball adding device 21, rubber ball counter 22, rubber ball storage chamber 23, rubber ball cleaner 24, valve six 25, and valve nine 19.

[0033] When the differential pressure transmitter 37 detects that the inlet and outlet pressure difference of the spiral heat exchanger 5 is greater than the safety value, the PLC controller 39 switches the control operation mode to the backwash state. At this time, the PLC controller sends a control signal No. 2: close valve 1 2, valve 2 7, valve 4 12, valve 5 20, ball adding device 21, rubber ball counter 22, rubber ball storage chamber 23, rubber ball cleaner 24 and valve 6 25, open the tap water inlet valve 9, pump 14, valve 7 16, valve 8 17, valve 9 19, valve 3 10, valve 10 36, and the system runs for several minutes under this signal. Then, the PLC controller sends a control signal No. 1. If the differential pressure transmitter 39 detects that the inlet and outlet pressure difference of the spiral heat exchanger 5 is within the normal safety value range, the entire system is in normal heat exchange working condition; if the differential pressure transmitter 37 detects that the inlet and outlet pressure difference of the spiral heat exchanger 5 is still greater than the safety value, the PLC controller 39 switches the control operation mode to the rubber ball flushing state, and the PLC controller sends a control signal No. 3.

[0034] In the rubber ball flushing state, the PLC controller sends control signal No. 3: open valve three 10, valve four 12, pump 14, valve five 20, ball adding device 21, rubber ball counter 22, rubber ball storage chamber 23, rubber ball cleaner 24, valve six 25, valve nine 19 and differential pressure transmitter 37, and close valve one 2, valve two 7, tap water inlet valve 9, valve seven 16, valve eight 17 and valve two 7. Run for several minutes under control signal No. 3. Then, the PLC controller sends control signal No. 1. At this time, if the differential pressure transmitter 37 detects that the inlet and outlet pressure difference of the spiral heat exchanger 5 is within the normal safety value range, the whole system is in normal heat exchange working condition; if the differential pressure transmitter 37 detects that the inlet and outlet pressure difference of the spiral heat exchanger is still greater than the safety value, the PLC controller sends control signal No. 3 and runs for several minutes under control signal No. 3 again. Then, the PLC controller sends control signal No. 1. At this time, if the differential pressure transmitter 37 detects that the inlet and outlet pressure difference of the spiral heat exchanger 5 is within the normal safety value range, the entire system is in normal heat exchange conditions; if the differential pressure transmitter 37 detects that the inlet and outlet pressure difference of the spiral heat exchanger is still greater than the safety value, the PLC controller issues an alarm and requests manual cleaning.

[0035] At this time, the end cover of the spiral heat exchanger can be opened and the pipeline can be cleaned manually. After the cleaning is completed, the control system returns to normal working state.

[0036] Although the implementation methods disclosed in this application are as above, the contents described are only implementation methods adopted for facilitating the understanding of this application, and are not intended to limit this application. Any technician in the technical field to which this application belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in this application, but the scope of patent protection of this application shall still be based on the scope defined in the attached claims.

Claims

1. A heat exchange system with a rubber ball backwashing function, comprising a filter (1) and a PLC controller (39), characterized in that: The filter (1) is connected to one end of valve one (2); the other end of valve one (2) is connected to the first end of tee one (3); the second end of tee one (3) is connected to the first end of differential pressure transmitter (37); the second end of differential pressure transmitter (37) is connected to the first end of tee two (4); the second end and the third end of tee two are respectively connected to sewage inlet one (26) and sewage inlet two (27) of the spiral heat exchanger (5); a sewage outlet (28) is provided at the right end of the spiral heat exchanger (5); the spiral heat exchanger (5) is connected to the sewage outlet (28) according to the first end of the spiral heat exchanger (5); The first end of the three-way pipe (6) is connected to the first end of the three-way pipe (6), the second end of the three-way pipe (6), and the second valve (7); the second valve (7) is connected to the culvert (8) through a pipeline; the intermediate water inlet (29) and the intermediate water inlet (30) are respectively arranged at the lower part of the spiral heat exchanger (5); the left end of the spiral heat exchanger (5) is provided with an intermediate water outlet (31); the third end of the three-way pipe (3) is downwardly connected to the third valve (10), the second end of the four-way pipe (11), the first end of the four-way pipe (11), the fourth valve (12), the first end of the five-way pipe (13), the five-way pipe (13) and the first end of the five-way pipe (13). 3) is connected to the second end of the pump (14); the pump (14) is also connected to the first end of the three-way six (15) through a pipeline; the second end of the three-way six (15) is connected to the valve five (20), the ball adding device (21), the rubber ball counter (22), and the rubber ball storage chamber (23) in sequence through a pipeline; the rubber ball storage chamber (23) is also connected to the rubber ball cleaning device (24); the lower side of the rubber ball cleaning device (24) is connected to the underground channel through a sewage pipe; the outlet end of the rubber ball storage chamber (23) is connected to the valve six (25) and one end of the three-way seven (18) in sequence through a pipeline; The third end of the three-way valve six (15) is connected to the third ends of the valve seven (16), valve eight (17) and three-way valve seven (18) in sequence through a pipeline; the second end of the three-way valve seven (18) is connected to the third ends of the valve nine (19) and three-way valve three (6) in sequence through a pipeline; the third end of the three-way valve four (11) is connected to one end of the valve ten (36), and the other end of the valve ten (36) is connected to the culvert (8) through a pipeline; one end of the tap water inlet valve (9) is connected to the third end of the three-way valve five (13), and the other end of the tap water inlet valve (9) is connected to a tap water source.

2. A heat exchange system with rubber ball backwashing function according to claim 1, characterized in that: The filter (1), spiral heat exchanger (5), valve 1 (2), tee 1 (3), differential pressure transmitter (37), tee 2 (4), tee 3 (6) and valve 2 (7) constitute a heat exchange system.

3. The heat exchange system with rubber ball backwashing function according to claim 1 is characterized in that: The tap water inlet valve (9), pump (14), three-way six (15), valve seven (16), valve eight (17), three-way seven (18), valve nine (19), spiral heat exchanger (5), three-way two (4), differential pressure transmitter (37), three-way one (3), valve three (10), three-way four (11), valve ten (36) and culvert (8) constitute a backwashing system.

4. The heat exchange system with rubber ball backwashing function according to claim 1 is characterized in that: The pump (14), three-way six (15), valve five (20), ball adding device (21), rubber ball counter (22), rubber ball storage chamber (23), rubber ball cleaning device (24), valve six (25), three-way seven (18), valve nine (19), three-way three (6), spiral heat exchange channel (33), three-way two (4), differential pressure transmitter (37), three-way one (3), valve three (10), three-way four (11), valve four (12) and three-way five (13) constitute a rubber ball cleaning system.

5. The heat exchange system with rubber ball backwashing function according to claim 1 is characterized in that: The PLC controller (28) is electrically connected to the wiring terminals of valve one (2), valve two (7), valve three (10), valve four (12), valve five (20), valve six (5), valve seven (16), valve ten (36), a differential pressure transmitter (37), a tap water inlet valve (9), a pump (14), a ball adding device (21), a rubber ball counter (22), a rubber ball storage chamber (23), and a rubber ball cleaning device (24) to form a control system.

6. The heat exchange system with rubber ball backwashing function according to claim 1 is characterized in that: The spiral heat exchanger (5) comprises a sewage inlet 1 (26), a sewage inlet 2 (27), a sewage outlet (28), an intermediate water inlet 1 (29), an intermediate water inlet 2 (30), an intermediate water outlet (31), a shell (32), a spiral heat exchange channel (33), a stirring paddle (34) and an end cover (35); the inner cavity wall of the spiral heat exchanger shell is provided with a spiral heat exchange channel (33) along the circumferential direction, and a stirring paddle (34) is provided in the central channel surrounded by the spiral heat exchange channel (33); the spiral heat exchanger (5) is a cylindrical body and is arranged horizontally; one end of the spiral heat exchanger is connected to the intermediate water outlet (31), and the other end is connected to the sewage outlet (31). The spiral heat exchange channel (33) is connected to the intermediate water channel (28); the spiral heat exchange channel is composed of a series of spiral plates arranged in parallel; a sewage inlet 1 (26) and a sewage inlet 2 (27) are respectively provided at the left and right ends of the upper side of the spiral heat exchange channel (33); an intermediate water inlet 1 (29) and an intermediate water inlet 2 (30) are respectively provided at the left and right ends of the lower side of the spiral heat exchange channel (33); the intermediate water inlet 1 (29) and the intermediate water inlet 2 (30) are connected to the intermediate water channel of the spiral heat exchange channel (33), and the other end of the intermediate water channel of the spiral heat exchange channel (33) is connected to the intermediate water outlet (31); and an end cover (35) is respectively provided at the left and right ends of the spiral heat exchanger (5).

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