Sewage heat recovery equipment

Abstract

The invention discloses sewage heat recovery equipment, and belongs to the field of heat recovery. The sewage heat recovery equipment comprises a box body, the sewage pipeline unit is arranged in the box body, and the water inlet and outlet ends penetrate through the box body; the first heat exchange device is arranged in the box body and exchanges heat with the sewage pipeline unit; the second heat exchange device is arranged in the box body; the circulating pipeline unit is arranged in the box body, circularly communicates with the box body and exchanges heat with the first heat exchange device and the second heat exchange device; the water pipeline unit is arranged in the box body, the water inlet and outlet end penetrates through the box body, and the second heat exchange device exchanges heat with the water pipeline unit. According to the sewage recovery equipment, the sewage recovery equipment is integrally arranged, all parts are integrally arranged in the box body, a user only needs to externally connect related pipelines and supply power to the equipment, heat recovery of sewage and heating of water can be achieved, use is convenient, personnel investment is reduced, an independent machine room does not need to be arranged, and cost is saved.

Description

Technical Field

[0001] The present invention belongs to the field of heat recovery, and more specifically, relates to a sewage heat recovery device. Background Art

[0002] With the vigorous implementation of energy conservation and emission reduction policies, people are increasingly concerned about the secondary recovery and utilization of waste energy. Nowadays, many large textile factories, food factories, chemical factories, pharmaceutical factories, etc. will generate process wastewater at about 20°C during the production and processing process. To achieve the recovery and utilization of this part of energy, many sewage heat recovery units have emerged on the market one after another. However, the types of units are relatively single, a separate use machine room needs to be set up, the matching degree of the whole set of equipment is low, professional operation and use personnel are required to monitor at all times, and the professionalism requirements for installation personnel are relatively high during the installation process. Slight omissions will lead to various problems such as pipeline leakage, equipment failure, and unit shutdown.

[0003] In view of this, the present invention is specifically proposed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art. The purpose is to provide a sewage heat recovery device. The sewage recovery device is integrated and integrally arranged, and each part is integrally arranged in a box body. Users only need to externally connect relevant pipelines correspondingly and supply power to the device, and the device can realize the heat recovery of sewage and use the recovered heat to heat water. It is convenient to use, does not require professional personnel for assembly, reduces personnel input, and saves costs; the device does not need to set up a separate machine room, which is convenient for reducing costs.

[0005] To solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: to provide a sewage heat recovery device, including,

[0006] A box body;

[0007] A sewage pipeline unit, which is arranged in the box body and the water inlet and outlet ends penetrate through the box body;

[0008] A first heat exchange device, which is arranged in the box body and is heat-exchanged with the sewage pipeline unit, and is used to recover the heat of the sewage in the sewage pipeline unit;

[0009] A second heat exchange device, which is arranged in the box body;

[0010] A circulating pipeline unit, which is arranged in the box body and is circularly connected and is respectively heat-exchanged with the first heat exchange device and the second heat exchange device, and transfers the heat absorbed from the first heat exchange device to the second heat exchange device;

[0011] A water pipeline unit is arranged in the box body, and the water inlet and outlet ends penetrate through the box body. The second heat exchange device is arranged for heat exchange with the water pipeline unit to heat the water in the water pipeline unit.

[0012] Furthermore, two sewage interfaces and two water interfaces are provided on the side wall of the box body, corresponding to being connected with the sewage pipeline unit and the water pipeline unit respectively, for connecting the pipelines for externally transporting sewage and water.

[0013] Furthermore, the first heat exchange device is arranged at one end of the box body in the length extension direction. The two sewage interfaces are correspondingly arranged on the side wall at the other end of the box body. The sewage pipeline unit is arranged in the other end of the box body and is respectively connected with the two sewage interfaces.

[0014] The sewage pipeline unit is arranged opposite to the first heat exchange device and extends to the end opposite to the sewage interface of the first heat exchange device for heat exchange.

[0015] Furthermore, the first heat exchange device is a heat pump unit, including an evaporator and a condenser arranged at intervals in the width extension direction of the box body. Heat exchange chambers are respectively arranged at the ends of the evaporator and the condenser facing the sewage interface for heat exchange with the coolant.

[0016] The heat exchange chamber of the evaporator is provided with a sewage inlet and a sewage outlet which are sequentially opposite to the two sewage interfaces and are respectively connected with the sewage pipeline unit. At the end of the heat exchange chamber of the condenser facing the sewage interface, there are provided a water inlet and a hot water outlet which are respectively connected with the circulation pipeline unit.

[0017] Furthermore, the two water interfaces are arranged on the side wall of the box body having the two sewage interfaces and are arranged opposite to the second heat exchange device.

[0018] The water pipeline unit is respectively connected with the two water interfaces and extends to the end opposite to the water interface of the second heat exchange device for heat exchange.

[0019] Preferably, the water pipeline unit, the second heat exchange device and the sewage pipeline unit are sequentially arranged along the width extension direction of the box body.

[0020] The circulation pipeline unit extends and is arranged between the first heat exchange device and the second heat exchange device.

[0021] Furthermore, a tap water interface is provided on one side wall of the box body. The tap water interface is connected with the circulation pipeline unit through a tap water pipe for transporting water to the circulation pipeline unit.

[0022] Further, the circulating pipeline unit further includes a water replenishing and pressure stabilizing device disposed on the tap water pipe. The water replenishing and pressure stabilizing device is disposed inside one end of the box body along the length extension direction. The first heat exchange device and the water replenishing and pressure stabilizing device are sequentially arranged along the width extension direction of the box body. The water replenishing and pressure stabilizing device is adjacently arranged with the second heat exchange device along the length extension direction of the box body;

[0023] The tap water interface is disposed on a side wall at one end of the box body along the width extension direction and is disposed close to the water replenishing and pressure stabilizing device.

[0024] Further, the cavity inside the box body forms a first accommodation cavity and a second accommodation cavity which are vertically spaced;

[0025] The sewage pipeline unit, the first heat exchange device, the circulating pipeline unit, the second heat exchange device and the water using pipeline unit are disposed inside the first accommodation cavity; the water replenishing and pressure stabilizing device is disposed inside the second accommodation cavity.

[0026] Further, the sewage heat recovery device further includes a control cabinet, which is disposed inside the box body and is electrically connected to the sewage pipeline unit, the first heat exchange device, the circulating pipeline unit, the second heat exchange device and the water using pipeline unit respectively, and is used for controlling the sewage waste heat recovery.

[0027] Further, the second accommodation cavity forms two layers of installation cavities which are horizontally spaced. The control cabinet and the water replenishing and pressure stabilizing device are correspondingly disposed in the upper and lower layers of installation cavities of the second accommodation cavity.

[0028] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

[0029] (1) In the present invention, the sewage recovery device is integrally and integratedly arranged, and each part is integrally arranged in the box body. The user only needs to externally connect the relevant pipelines correspondingly and supply power to the device, and the device can realize the heat recovery of sewage and use the recovered heat to heat water. It is convenient to use, does not require professional personnel to assemble, reduces personnel input and saves costs; the device does not need to be provided with a separate machine room, which is convenient for cost reduction.

[0030] (2) In the present invention, by setting the control cabinet, automatic control is realized, which does not require professional operation and does not require the user to monitor at all times, reducing personnel input and management costs.

[0031] (3) In the present invention, the first heat exchange device is disposed at one end of the box body along the length extension direction, and the sewage interface is disposed on the side wall at the other end of the box body along the length extension direction and is disposed opposite to the first heat exchange device, which can reduce the space occupied by each part inside the box body, make the structure compact and is convenient for realizing integration.

[0032] The following further describes in detail the specific embodiments of the present invention with reference to the accompanying drawings. Description of the Drawings

[0033] The accompanying drawings, as a part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation to the present invention. Obviously, the drawings in the following description are only some embodiments. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. In the drawings:

[0034] Figure 1 is a schematic diagram of a sewage recycling device of the present invention;

[0035] Figure 2 is the present invention Figure 1 a cross-sectional view taken along line A-A in the present invention;

[0036] Figure 3 is the present invention Figure 1 a schematic diagram from another angle;

[0037] Figure 4 is the present invention Figure 1 a schematic diagram from yet another angle.

[0038] In the figures: 1. Box body; 100. First accommodation cavity; 101. Second accommodation cavity; 102. Sewage interface; 103. Water use interface; 104. Tap water interface; 105. Air inlet louvers; 106. Inspection door; 2. Sewage pipeline unit; 21. Sewage inlet pipe; 22. Sewage outlet pipe; 23. Electric control valve for sewage pipeline; 24. Sewage circulation pump; 25. Strainer 25; 3. First heat exchange device; 31. Compressor; 32. Condenser; 33. Expansion valve; 34. Evaporator; 4. Circulation pipeline unit; 41. Circulation inlet pipe; 42. Circulation outlet pipe; 43. Tap water pipe; 44. Make-up water and pressure stabilizing device; 441. Water softener; 442. Make-up water tank; 443. Pressure stabilizing make-up water device; 45. Electric control valve for heat recovery pipeline; 46. Heat recovery circulation pump; 5. Second heat exchange device; 51. Electric control valve for heat exchanger pipeline; 6. Water use pipeline unit; 61. Water use inlet pipe; 62. Water use outlet pipe; 63. Domestic hot water circulation pump; 7. Control cabinet; 8. Cooling fan.

[0039] It should be noted that these drawings and text descriptions are not intended to limit the scope of the concept of the present invention in any way, but to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Specific Embodiments

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments in conjunction with the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0041] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0042] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] As Figures 1 to 4 shown, a sewage heat recovery device according to the present invention includes a box body 1, a sewage pipeline unit 2, a first heat exchange device 3, a circulation pipeline unit 4, a second heat exchange device 5, and a water pipeline unit 6.

[0044] The sewage pipeline unit 2 is disposed in the box body 1 and its water inlet and outlet ends penetrate through the box body 1.

[0045] The first heat exchange device 3 is disposed in the box body 1 and is arranged for heat exchange with the sewage pipeline unit 2 to recover the heat of the sewage in the sewage pipeline unit 2.

[0046] The second heat exchange device 5 is disposed in the box body 1.

[0047] The circulation pipeline unit 4 is disposed in the box body 1 and is in a circulating connection, and is respectively arranged for heat exchange with the first heat exchange device 3 and the second heat exchange device 5 to transfer the heat absorbed from the first heat exchange device 3 to the second heat exchange device 5.

[0048] The water pipeline unit 6 is disposed in the box body 1 and its water inlet and outlet ends penetrate through the box body 1. The second heat exchange device 5 is arranged for heat exchange with the water pipeline unit 6 to heat the water in the water pipeline unit 6.

[0049] In the above solution, the sewage pipeline unit 2, the first heat exchange device 3, the circulating pipeline unit 4, the second heat exchange device 5, and the water pipeline unit 6 are all arranged in the box body 1. The sewage recovery equipment is integrated and integrally arranged, and each part is integrally arranged in the box body 1. Users only need to externally connect relevant pipelines and supply power to the equipment, and the equipment can realize the heat recovery of sewage and use the recovered heat to heat water. It is convenient to use, does not require professional personnel to assemble, reduces personnel input, and saves costs; the equipment does not need to be set up in a separate machine room, which is convenient for cost reduction.

[0050] The sewage heat recovery equipment further includes a control cabinet 7, and the control cabinet 7 is electrically connected to the sewage pipeline unit 2, the first heat exchange device 3, the circulating pipeline unit 4, the second heat exchange device 5, and the water pipeline unit 6 respectively, and is used for controlling the recovery of sewage waste heat.

[0051] The control cabinet 7 can be arranged inside or outside the box body 1.

[0052] Preferably, the control cabinet 7 can be arranged inside the box body 1.

[0053] In the above solution, by setting the control cabinet 7, automatic control is realized, no professional operation is required, and no user needs to monitor it all the time, reducing personnel input and management costs.

[0054] The control cabinet 7 integrates a central controller module, a data acquisition module, a data analysis module, a data output module, and an abnormal analysis and its management module display. The touch screen of the central controller is arranged outside the control cabinet 7.

[0055] The sewage pipeline unit 2, the first heat exchange device 3, the circulating pipeline unit 4, the second heat exchange device 5, and the water pipeline unit 6 are all electrically connected to the control cabinet 7 and send electrical signals to the control cabinet 7 in real time. The control cabinet 7 receives the electrical signals, processes relevant data, automatically controls each part, and displays relevant data on the touch screen in real time. And it can perform trend recording and report management on relevant data information, etc. It can remotely read the equipment operation status and adjustment parameters, realize automatic control, does not require professional operation, and does not require users to monitor all the time, reducing personnel input and management costs. All control operations and their set parameters can be set through the touch screen of the central controller, monitor the operation status, view fault information, view relevant historical data, etc.; in addition, the central controller is connected to the remote 4G network module, and can send information to the cloud platform in real time, which is convenient for remote equipment operation and information query, and is convenient for later operation and maintenance management. Remote operation and maintenance and automatic control can be realized, which is convenient for reducing personnel input and saving management costs.

[0056] The water inlet and outlet ends of the sewage pipeline unit 2 and the water inlet and outlet ends of the water pipeline unit 6 both penetrate through the box body 1, facilitating the user to externally connect pipelines.

[0057] The sewage recovery device is integrally and integratedly arranged, and each part is integrally arranged in the box body 1. When the user uses it, professional installers are not required for assembly, reducing the personnel input. The user only needs to externally connect pipelines to the sewage pipeline unit 2 and the water pipeline unit 6, and then supply power to the device. The device can achieve automatic control, can perform heat recovery on sewage, and use the recovered heat to heat water.

[0058] The sewage recovery device does not need to be placed separately in a machine room and can be placed outdoors.

[0059] Preferably, the sewage pipeline unit 2 further includes a dirt remover 25, which is arranged at the water inlet end of the sewage pipeline unit 2. A drain pipe is connected to the dirt remover 25, and a sewage discharge valve is arranged on the drain pipe.

[0060] As Figure 2 and Figure 3 shown, two sewage interfaces 102 and two water interfaces 103 are arranged on the side wall of the box body 1, corresponding to being connected to the sewage pipeline unit 2 and the water pipeline unit 6, and are used for externally connecting pipelines for transporting sewage and water.

[0061] In the above solution, two sewage interfaces 102 and two water interfaces 103 are provided to facilitate the user to externally connect pipelines.

[0062] Specifically, the sewage pipeline unit 2 includes a sewage inlet pipe 21 and a sewage outlet pipe 22. One end of the sewage inlet pipe 21 and one end of the sewage outlet pipe 22 correspondingly communicate with the two sewage interfaces 102.

[0063] The circulation pipeline unit 4 includes a circulation inlet pipe 41 and a circulation outlet pipe 42. One end of the circulation inlet pipe 41 and one end of the circulation outlet pipe 42 are respectively connected to the first heat exchange device 3.

[0064] The water pipeline unit 6 includes a water inlet pipe 61 and a water outlet pipe 62. One end of the water inlet pipe 61 and one end of the water outlet pipe 62 correspondingly communicate with the two water interfaces 103.

[0065] The first heat exchange device 3 includes a compressor 31, a condenser 32, an expansion valve 33 and an evaporator 34 that are interconnected. The coolant circulates in the first heat exchange device 3, and coolant flow channels and fluid flow channels are both arranged at intervals in the condenser 32 and the evaporator 34. The coolant flows through the coolant flow channels.

[0066] Both ends of the fluid flow channel in the evaporator 34 are respectively communicated with the other end of the sewage inlet pipe 21 and the other end of the sewage outlet pipe 22.

[0067] Both ends of the fluid flow channel in the condenser 32 are respectively communicated with one end of the circulation inlet pipe 41 and one end of the circulation outlet pipe 42.

[0068] The second heat exchange device 5 includes at least one heat exchanger. Two flow channels are provided in one heat exchanger. Both ends of one flow channel are respectively communicated with the other end of the circulation inlet pipe 41 and the other end of the circulation outlet pipe 42; both ends of the other flow channel are respectively communicated with the water inlet pipe 61 and the water outlet pipe 62.

[0069] There is a circulating liquid circulating in the circulation inlet pipe 41 and the circulation outlet pipe 42.

[0070] When the sewage recovery device works, sewage enters from the sewage inlet pipe 21. The dirt remover 25 first removes dirt from the sewage. Then the sewage enters the first heat exchange device 3 and exchanges heat with the coolant in the first heat exchange device 3. The coolant absorbs the heat in the sewage and circulates in the first heat exchange device 3, while the temperature of the sewage drops. The sewage flows out of the first heat exchange device 3 and enters the sewage outlet pipe 22 for discharge. The circulating liquid enters the first heat exchange device 3 from the circulation inlet pipe 41, exchanges heat with the coolant. The coolant releases energy, while the circulating liquid absorbs heat and its temperature rises. Then the circulating liquid flows out of the first heat exchange device 3 and enters the circulation outlet pipe 42. Subsequently, it enters the second heat exchange device 5 and then enters the circulation inlet pipe 41 from the second heat exchange device 5. The circulating liquid circulates between the first heat exchange device 3 and the second heat exchange device 5.

[0071] Water enters the second heat exchange device 5 from the water inlet pipe 61. The water exchanges heat with the circulating liquid that enters the second heat exchange device 5 through the circulating outlet pipe 42. The temperature of the water rises and then flows out through the water outlet pipe 62 for users to use. The temperature of the circulating liquid drops and then flows into the circulating inlet pipe 41 to enter the first heat exchange device 3 again for heat exchange. Among them, the circulating liquid is maintained within a certain temperature range and circulates between the first heat exchange device 3 and the second heat exchange device 5. Although the circulating liquid loses a certain amount of heat after exchanging heat with the water, it still enters the first heat exchange device 3 at a relatively high temperature. The first heat exchange device 3 continues to exchange heat with the circulating liquid at a relatively high temperature to raise it to a suitable temperature, only requiring low-frequency operation and consuming less electrical energy. While the normal first heat exchange device 3 needs to maintain high-frequency operation to heat low-temperature water to high temperature, with a large load and more electrical energy consumption. Therefore, setting the circulating pipeline unit 4 between the first heat exchange device 3 and the second heat exchange device 5 can reduce the energy loss of the first heat exchange device 3. Especially after long-term operation, it can greatly reduce energy consumption and lower the user's usage cost.

[0072] The water outlet pipe 62 can be directly used for domestic water, including bathing, washing clothes, etc. The water heated by the device can also be used for heating facilities. The water outlet pipe 62 is connected to the water inlet of the heating facilities for heating; the water inlet pipe 61 is connected to the water outlet of the heating facilities to make the cooled water flow back to the device for heating to form a cycle.

[0073] The sewage pipeline unit 2, the circulating pipeline unit 4, and the second heat exchange device 5 are successively provided with a sewage pipeline electric control valve 23, a heat recovery pipeline electric control valve 45, and a heat exchanger pipeline electric control valve 51, and all are electrically connected to the control cabinet 7. The sewage pipeline unit 2, the circulating pipeline unit 4, and the water pipeline unit 6 are successively provided with a sewage circulation pump 24, a heat recovery circulation pump 46, and a domestic hot water circulation pump 63, and all are electrically connected to the control cabinet 7.

[0074] The sewage inlet pipe 21 has two parallel first branches, and the sewage circulation pump 24 is provided on the first branch. The circulating inlet pipe 41 has two parallel second branches, and the heat recovery circulation pump 46 is provided on the second branch. The water inlet pipe 61 has two parallel third branches, and the domestic hot water circulation pump 63 is provided on the third branch.

[0075] Specifically, the sewage inlet pipe 21, the circulating inlet pipe 41, and the water inlet pipe 61 are all provided with two branches, and circulating pumps are provided on both branches. During normal operation, only one of the branches is connected, and the other branch is not connected as a standby branch to prevent the entire device from malfunctioning when one of the branches fails; moreover, the two branches can be used alternately, that is, the circulating pumps on the two branches are used alternately, which can extend the overall service life of the two circulating pumps and thus extend the service life of the entire device.

[0076] The second heat exchange device 5 includes two heat exchangers, and the two heat exchangers are arranged in parallel between the circulating inlet pipe 41 and the circulating outlet pipe 42 and are also arranged in parallel between the water inlet pipe 61 and the water outlet pipe 62.

[0077] Specifically, the heat exchanger is a plate heat exchanger. The other end of the circulating outlet pipe 42 branches out into two branch water paths, which are respectively connected to the two heat exchangers, and heat exchange pipeline electric control valves, pressure gauges, thermometers, etc. are provided on both branch water paths. The other end of the circulating inlet pipe 41 also branches out into two branch water paths, which are respectively connected to the two heat exchangers, and drain valves, exhaust valves, pressure gauges, thermometers, etc. are provided on both branch water paths. The connection modes of the water inlet pipe 61 and the water outlet pipe 62 to the two heat exchangers are the same as above.

[0078] If the requirement for the supply water temperature of the water is not high, only one of the heat exchangers can be turned on, and then the corresponding pipes connected to the heat exchanger are connected, so that the circulating outlet pipe 42 and the circulating inlet pipe 41 are only connected to this heat exchanger. Correspondingly, the water inlet pipe 61 and the water outlet pipe 62 are also only connected to this heat exchanger.

[0079] If it is necessary to heat the water as soon as possible, the two parallel heat exchangers are turned on simultaneously. The circulating outlet pipe 42 is respectively connected to the two heat exchangers, the circulating inlet pipe 41 is respectively connected to the two heat exchangers, the water inlet pipe 61 is respectively connected to the two heat exchangers, and the water outlet pipe 62 is respectively connected to the two heat exchangers.

[0080] Hot water enters the two heat exchangers from the circulating outlet pipe 42, then flows out of the two heat exchangers and enters the circulating inlet pipe 41; the water enters the two heat exchangers from the water inlet pipe 61, exchanges heat with the hot water entering the heat exchangers from the circulating outlet pipe 42, and the water with increased temperature flows out and mixes, then enters the water outlet pipe 62 for users to use.

[0081] The two heat exchangers are arranged in parallel, which can enable the hot water in the circulating outlet pipe 42 to exchange heat with the water in the water inlet pipe 61 twice, and can quickly increase the temperature of the water, which is convenient for users to use.

[0082] As Figure 2 shown, the first heat exchange device 3 is arranged inside one end of the box body 1 in the length extension direction thereof, two sewage interfaces 102 are correspondingly arranged on the side wall of the other end of the box body 1, and the sewage pipeline unit 2 is arranged inside the other end of the box body 1 and is communicated with the two sewage interfaces 102 respectively.

[0083] The sewage pipeline unit 2 is arranged opposite to the first heat exchange device 3 and extends to the end of the first heat exchange device 3 opposite to the sewage interface 102 for heat exchange.

[0084] In the above solution, the first heat exchange device 3 is arranged at one end of the box body 1 in the length extension direction, and the sewage interface 102 is arranged on the side wall of the other end of the box body 1 in the length extension direction and is arranged opposite to the first heat exchange device 3, which can reduce the space occupied by each part inside the box body 1, make the structure compact and facilitate the realization of integration.

[0085] Specifically, the first heat exchange device 3 is arranged at one end of the box body 1 in the length extension direction, and the sewage interface 102 is arranged on the side wall of the other end of the box body 1 in the length extension direction and is arranged opposite to the first heat exchange device 3, which is convenient for arranging the pipelines in the sewage pipeline unit 2 between the two. The pipelines in the sewage pipeline unit 2 can be arranged centrally and orderly and the length of the pipelines in the sewage pipeline unit 2 can be reduced. This not only makes the liquid flow smoothly in the pipelines, but also reduces the space occupied by the pipelines, avoids the disorderly arrangement of the pipelines resulting in the unsmooth flow of the liquid in the pipelines and the excessive occupation of space, and further facilitates the integration and is beneficial to reducing the volume of the box body 1.

[0086] As Figure 2 shown, the first heat exchange device 3 is a heat pump unit, which includes an evaporator 34 and a condenser 32 arranged at intervals in the width extension direction of the box body 1. Heat exchange cavities are respectively arranged at the ends of the evaporator 34 and the condenser 32 facing the sewage interface 102 for heat exchange with the coolant;

[0087] The heat exchange cavity of the evaporator 34 is provided with a sewage inlet and a sewage outlet which are successively opposite to the two sewage interfaces 102 and are respectively communicated with the sewage pipeline unit 2; an inlet and a hot water outlet are arranged at the end of the heat exchange cavity of the condenser 32 facing the sewage interface 102 and are respectively communicated with the circulating pipeline unit 4.

[0088] In the above solution, the evaporator 34 and the condenser 32 are arranged at intervals in the width extension direction of the box body 1, which can reduce the space occupied by the evaporator 34 and the condenser 32, make the structure inside the box body 1 more compact and facilitate the realization of integration.

[0089] Specifically, both the evaporator 34 and the condenser 32 are shell-and-tube heat exchangers, which can simultaneously pass two fluids and heat exchange occurs between the two fluids.

[0090] The coolant circulates between the compressor 31, the condenser 32, the expansion valve 33 and the evaporator 34. The heat exchange chamber of the evaporator 34 is the fluid flow channel of the evaporator 34, and the sewage flows through this fluid flow channel; the heat exchange chamber of the condenser 32 is the fluid flow channel of the condenser 32, and the circulating liquid flows through this fluid flow channel.

[0091] When the sewage enters the evaporator 34, heat exchange occurs with the coolant, the temperature of the sewage decreases, and the temperature of the coolant increases. When the coolant with increased temperature flows to the condenser 32, heat exchange occurs with the circulating liquid, the temperature of the coolant decreases, and the temperature of the circulating liquid increases.

[0092] The two sewage interfaces 102 are arranged in parallel and are respectively opposite to the sewage inlet and the sewage outlet. The sewage inlet pipe 21 and the sewage outlet pipe 22 extend in parallel, which can make the sewage inlet pipe 21 and the sewage outlet pipe 22 be arranged in an orderly manner, facilitate the smooth flow of sewage, reduce the pipeline length, reduce the space occupied by the pipeline, and facilitate the realization of integration.

[0093] Preferably, both the evaporator 34 and the condenser 32 extend along the length extension direction of the box body 1, which can reduce the space occupied by the evaporator 34 and the condenser 32, make the structure inside the box body 1 more compact, and facilitate the realization of integration.

[0094] The two water interfaces 103 are arranged on one side wall of the box body 1 having the two sewage interfaces 102 and are opposite to the second heat exchange device 5.

[0095] The water pipeline unit 6 is respectively communicated with the two water interfaces 103 and extends to the end of the second heat exchange device 5 opposite to the water interfaces 103 for heat exchange.

[0096] Preferably, the water pipeline unit 6 and the second heat exchange device 5 are sequentially arranged along the width extension direction of the box body 1 with the sewage pipeline unit 2.

[0097] The circulating pipeline unit 4 extends and is arranged between the first heat exchange device 3 and the second heat exchange device 5.

[0098] In the above solution, the two water interfaces 103 are opposite to the second heat exchange device 5, which is convenient for arranging the pipelines in the water pipeline unit 6 and facilitating the realization of integration.

[0099] Specifically, the two water interfaces 103 and the two sewage interfaces 102 are arranged on the same side wall of the box body 1, and the interfaces are all arranged on the side wall of the box body 1 in the same direction, so that the user can externally connect multiple pipes in the same direction, which is convenient for the user to operate.

[0100] Preferably, the two water interfaces 103 are arranged in parallel.

[0101] More preferably, the two water interfaces 103 and the two sewage interfaces 102 are all arranged in parallel.

[0102] The water pipeline unit 6 and the second heat exchange device 5 and the sewage pipeline unit 2 are arranged in sequence along the width extension direction of the box body 1, so that the structure inside the box body 1 is compact and it is convenient to realize integration.

[0103] A tap water interface 104 is provided on one side wall of the box body 1, and the tap water interface 104 is communicated with the circulating pipeline unit 4 through a tap water pipe 43 for conveying water to the circulating pipeline unit 4.

[0104] Specifically, the circulating liquid can be set as tap water, and the tap water enters the circulating water inlet pipe 41 from the tap water pipe 43, so that the circulating water inlet pipe 41 and the circulating water outlet pipe 42 are filled with water, and then the water inlet is stopped.

[0105] The circulating pipeline unit 4 further includes a make-up water constant pressure device 44 arranged on the tap water pipe 43. The make-up water constant pressure device 44 is arranged inside one end of the box body 1 along the length extension direction. The first heat exchange device 3 and the make-up water constant pressure device 44 are arranged in sequence along the width extension direction of the box body 1, and the make-up water constant pressure device 44 is arranged adjacent to the second heat exchange device 5 along the length extension direction of the box body 1.

[0106] The tap water interface 104 is arranged on the side wall at one end of the box body 1 along the width extension direction and is arranged close to the make-up water constant pressure device 44.

[0107] In the above solution, by arranging the make-up water constant pressure device 44, the circulating pipeline unit 4 can be replenished with water in time to avoid insufficient pipeline pressure in the circulating pipeline unit 4.

[0108] Specifically, the make-up water constant pressure device 44 includes a water softener 441, a make-up water tank 442 and a constant pressure make-up water device 443. One end of the tap water pipe 43 penetrates through the box body 1 and the other end is sequentially communicated with the water softener 441, the make-up water tank 442 and the constant pressure make-up water device 443 and is communicated with the circulating water inlet pipe 41.

[0109] When the pressure in the circulating pipeline unit 4 is detected to decrease, the water replenishment and constant pressure device 44 is promptly activated for water replenishment and pressure boosting operations to maintain the pressure stability in the circulating pipeline unit 4.

[0110] The tap water in the water pipe 43 will first enter the water softener 441. The water softener 441 can soften the water, which can reduce the scaling problem inside the pipeline and extend the pipeline maintenance time when the softened water then enters the pipeline.

[0111] The water replenishment tank 442 can play the role of storing water. When a large amount of water needs to be provided in a short time, the constant pressure water replenisher 443 works, and it can draw a large amount of tap water from the water replenishment tank 442 in a short time to facilitate timely water replenishment to the circulating water inlet pipe 41.

[0112] A backflow preventer is also provided on the water pipe 43, which is arranged before the water softener 441 to prevent the backflow of tap water.

[0113] The cavity inside the box body 1 forms a first accommodation cavity 100 and a second accommodation cavity 101 that are vertically spaced apart.

[0114] The sewage pipeline unit 2, the first heat exchange device 3, the circulating pipeline unit 4, the second heat exchange device 5, and the water using pipeline unit 6 are arranged in the first accommodation cavity 100; the water replenishment and constant pressure device 44 is arranged in the second accommodation cavity 101.

[0115] Specifically, the space inside the box body 1 is divided into two spaced accommodation cavities, so that each part inside the box body 1 is orderly distributed in the two accommodation cavities, improving the utilization rate of the space inside the box body 1, making each part inside the box body 1 more compact, facilitating the reduction of the volume of the entire device, and being conducive to realizing integration.

[0116] The second accommodation cavity 101 forms two horizontally spaced installation cavities, and the control cabinet 7 and the water replenishment and constant pressure device 44 are correspondingly arranged in the upper and lower two installation cavities of the second accommodation cavity 101.

[0117] Specifically, the control cabinet 7 and the water replenishment and constant pressure device 44 are respectively arranged in the two installation cavities of the second accommodation cavity 101, improving the utilization rate of the space inside the box body 1 and being conducive to realizing integration.

[0118] A plurality of installation parts are provided inside the box body 1 for limiting and installing each device inside the box body 1 to prevent the devices from shaking when the box body 1 moves.

[0119] The bottom wall of the box body 1 is provided with a plurality of limiting members for limiting each pipeline close to the bottom wall of the box body 1; a plurality of cross beams are arranged at intervals on the top wall in the box body 1, and several pipelines are hung and fixed on the cross beams.

[0120] A plurality of heat dissipation fans 8 are arranged at intervals on the box body 1, and a plurality of air inlet louvers 105 are arranged on the side wall of the box body 1.

[0121] The heat dissipation fan 8 is arranged at the top of the box body 1, and the heat dissipation fan 8 is arranged between adjacent cross beams. When the heat dissipation fan 8 works, it can accelerate the circulation of air inside the box body 1 and the outside air, which is convenient for heat dissipation, and can avoid the temperature inside the box body 1 being too high due to long-term operation of each part, affecting the normal operation of the equipment.

[0122] The box body 1 is provided with an openable and closable maintenance door 106 for the convenience of operators during maintenance.

[0123] The maintenance door 106 is arranged on the side wall of the box body 1, and a visible observation window is arranged on the door body, which is convenient for observing the operation conditions of each part inside from outside the box body 1. A handle is also arranged on the door body for the convenience of operators to open and close the door.

[0124] Preferably, there are at least two maintenance doors 106, which are arranged corresponding to the first accommodation cavity 100 and the second accommodation cavity 101.

[0125] Pressure sensors and temperature sensors are arranged at the water inlet and outlet ends of the sewage pipeline unit 2, the water inlet and outlet ends of the circulating pipeline unit 4, and the water inlet and outlet ends of the water using pipeline unit 6. The pressure sensors and the temperature sensors are both electrically connected to the control cabinet 7, and send electrical signals to the control cabinet 7 in real time. The control cabinet 7 receives the signals and processes relevant data.

[0126] The present invention also provides a control method for a sewage heat recovery device. The control method includes the following steps:

[0127] Obtain the temperature difference and pressure difference at the water inlet and outlet ends of the sewage pipeline unit 2, and automatically adjust the operating frequency of the sewage pump through a threshold comparison algorithm combined with a PID control algorithm;

[0128] Obtain the temperature difference at the water inlet and outlet ends of the circulating pipeline unit 4, and perform logical operations based on the threshold difference and the set difference to control the increase and decrease frequency operations of the hot water circulation pump; obtain the pipeline pressure in the circulating outlet pipe 42 in real time. When the pressure acquisition value is less than the lower limit pressure setting value, the water replenishing and constant pressure device 44 is automatically controlled to replenish water and boost the pressure of the pipeline. When it is detected that the pipeline pressure is greater than the set pressure upper limit, the water replenishing and constant pressure device 44 stops working.

[0129] Obtain the temperature difference between the inlet and outlet water of the water pipeline unit 6, perform logical operations based on the threshold difference. When the temperature difference is greater than the set upper temperature limit, automatically increase the frequency of the living circulation pump to meet the heat supply requirements at the end. When the temperature difference is less than the set lower temperature limit, automatically reduce the living circulation pump for energy-saving operation.

[0130] Collect real-time data through temperature sensors, pressure sensors, flow sensors, compressor 31, evaporator 34, expansion valve 33, condenser 32, etc. in the equipment; then perform data analysis through the central controller, and then perform logical output through the control algorithm to control corresponding operations such as automatic control of the sewage circulation pump 24, heat recovery circulation pump 46, domestic hot water circulation pump 63, pipeline electric valve, compressor 31, and expansion valve 33, and display data such as pump frequency, water valve opening, pipeline pressure, pipeline temperature, and pipeline flow on the touch screen in real time.

[0131] First, the sewage enters the dirt separator 25 through the pipeline. The water filtered by the dirt separator 25 will enter the circulation loop of the first heat exchange device 3 through the sewage circulation pump 24, and the heat in the sewage is exchanged through the automatic control of the compressor 31 and the expansion valve 33. The central controller will automatically adjust the operating frequency of the sewage circulation pump 24 according to the temperature sensor and pressure sensor data information collected by the sewage pipeline acquisition module, through the threshold comparison algorithm combined with the PID control algorithm. When the threshold difference of the collected data exceeds the set pressure difference value, reduce the frequency converter frequency; when the threshold difference of the supply and return water temperature sensor data of the sewage pipeline is less than the set temperature difference value, also perform frequency reduction operation to achieve the dynamic energy-saving effect. When the flow sensor detects insufficient water flow or too low pump frequency, an alarm will be generated and displayed on the touch screen, and an audible and visual alarm will be triggered to automatically adjust the frequency converter frequency to meet the pipeline water supply requirements and avoid the problem of the compressor 31 shutting down due to insufficient water flow.

[0132] Adjust the opening of the pipeline electric proportional valve to ensure the stability of water temperature and water flow, and achieve the best operating state of the evaporator 34. By detecting the pipeline pressure difference between the inlet and outlet of the dirt separator 25, when the pressure difference is greater than the set alarm upper limit value, open the blowdown valve for automatic blowdown operation, and when the pressure difference is less than the set lower limit value, close the blowdown valve.

[0133] In the circulating pipeline unit 4, when the temperature difference is greater than the upper temperature limit, two hot water circulation pumps will be started to meet the high heat demand of the pipeline for the two plate heat exchangers. When the temperature difference is less than the lower temperature limit, one of the hot water circulation pumps will be closed to meet the low heat demand of the pipeline for the two plate heat exchangers.

[0134] Before the sewage heat recovery equipment works, it conducts self-check: Open the electric control valve 23 of the sewage pipeline, the electric control valve 45 of the heat recovery pipeline, and the electric control valve 51 of the heat exchanger pipeline. After waiting for T1 seconds to receive the valve open in-place signal, turn on the domestic hot water circulation pump 63, the heat recovery circulation pump 46, and the sewage circulation pump 24 in sequence. After checking that there is no fault in operation for T2 seconds, conduct heat dissipation. After checking that there is no fault in T3 seconds and detecting that the water temperature of the evaporator 34 reaches the starting condition preset by the unit for the compressor 31, the compressor 31 starts and operates with step-by-step loading.

[0135] Specifically, after the control cabinet 7 sets one-key startup, it runs a self-check program to detect whether the equipment is operating normally. Among them, T1, T2, and T3 can be set to 120 seconds, 200 seconds, and 350 seconds respectively.

[0136] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art of this patent, without departing from the scope of the technical solution of the present invention, can make some changes or modifications using the technical content prompted above as equivalent embodiments of equivalent changes. The implementation schemes in the above embodiments can also be further combined or replaced. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change, and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the present invention's solution.

Claims

1. A sewage heat recovery device, characterized in that: including, a box body (1); a sewage pipeline unit (2), arranged in the box body (1) and with the water inlet and outlet penetrating through the box body (1); a first heat exchange device (3), arranged in the box body (1), heat-exchanged with the sewage pipeline unit (2), and used for recovering the heat of the sewage in the sewage pipeline unit (2); a second heat exchange device (5), arranged in the box body (1); a circulating pipeline unit (4), arranged in the box body (1), in a circulating connection, heat-exchanged with the first heat exchange device (3) and the second heat exchange device (5) respectively, and transferring the heat absorbed from the first heat exchange device (3) to the second heat exchange device (5); a water pipeline unit (6), arranged in the box body (1) and with the water inlet and outlet penetrating through the box body (1), and the second heat exchange device (5) is heat-exchanged with the water pipeline unit (6) for heating the water in the water pipeline unit (6).

2. The sewage heat recovery device according to claim 1, wherein: Two sewage interfaces (102) and two water interfaces (103) are arranged on the side wall of the box body (1), corresponding to being connected with the sewage pipeline unit (2) and the water pipeline unit (6) respectively, and are used for externally connecting pipelines for conveying sewage and water.

3. The sewage heat recovery device according to claim 2, characterized in that: The first heat exchange device (3) is arranged at one end of the box body (1) in the length extension direction, the two sewage interfaces (102) are correspondingly arranged on the side wall of the other end of the box body (1), and the sewage pipeline unit (2) is arranged in the other end of the box body (1) and is respectively connected with the two sewage interfaces (102); The sewage pipeline unit (2) is arranged opposite to the first heat exchange device (3) and extends to the end opposite to the first heat exchange device (3) and the sewage interface (102) for heat exchange.

4. The sewage heat recovery device according to claim 3, wherein: The first heat exchange device (3) is a heat pump unit, including an evaporator (34) and a condenser (32) arranged at intervals along the width extension direction of the box body (1), and heat exchange cavities are respectively arranged at the ends of the evaporator (34) and the condenser (32) facing the sewage interface (102) for heat exchange with the coolant; The heat exchange cavity of the evaporator (34) is provided with a sewage inlet and a sewage outlet that are sequentially opposite to the two sewage interfaces (102), and are respectively connected with the sewage pipeline unit (2); at the end of the heat exchange cavity of the condenser (32) facing the sewage interface (102), a water inlet and a hot water outlet are provided, and are respectively connected with the circulating pipeline unit (4).

5. The sewage heat recovery device according to claim 4, characterized in that: The two water interfaces (103) are arranged on the side wall of the box body (1) having the two sewage interfaces (102), and are arranged opposite to the second heat exchange device (5); The water pipeline unit (6) is respectively connected with the two water interfaces (103) and extends to the end opposite to the second heat exchange device (5) and the water interface (103) for heat exchange; Preferably, the water pipeline unit (6) and the second heat exchange device (5) are sequentially arranged along the width extension direction of the box body (1) with the sewage pipeline unit (2); The circulating pipeline unit (4) extends between the first heat exchange device (3) and the second heat exchange device (5).

6. The sewage heat recovery device according to any one of claims 1-5, characterized in that: A tap water interface (104) is provided on one side wall of the box body (1), and the tap water interface (104) is communicated with the circulating pipeline unit (4) through a tap water pipe (43) for delivering water to the circulating pipeline unit (4).

7. The sewage heat recovery device according to claim 6, wherein: The circulating pipeline unit (4) further includes a make-up water constant pressure device (44) arranged on the tap water pipe (43). The make-up water constant pressure device (44) is arranged at one end of the box body (1) along the length extension direction. The first heat exchange device (3) and the make-up water constant pressure device (44) are arranged in sequence along the width extension direction of the box body (1). The make-up water constant pressure device (44) is arranged adjacent to the second heat exchange device (5) along the length extension direction of the box body (1). The tap water interface (104) is arranged on one side wall at one end of the box body (1) along the width extension direction and is arranged close to the make-up water constant pressure device (44).

8. The sewage heat recovery device according to claim 7, wherein: The cavity in the box body (1) forms a first accommodation cavity (100) and a second accommodation cavity (101) which are vertically arranged at intervals. The sewage pipeline unit (2), the first heat exchange device (3), the circulating pipeline unit (4), the second heat exchange device (5) and the water using pipeline unit (6) are arranged in the first accommodation cavity (100); the make-up water constant pressure device (44) is arranged in the second accommodation cavity (101).

9. The sewage heat recovery device according to claim 8, characterized in that: It further includes a control cabinet (7) arranged in the box body (1), which is electrically connected to the sewage pipeline unit (2), the first heat exchange device (3), the circulating pipeline unit (4), the second heat exchange device (5) and the water using pipeline unit (6) respectively for controlling the recovery of sewage waste heat.

10. The sewage heat recovery device according to claim 9, characterized in that: The second accommodation cavity (101) forms two horizontally spaced installation cavities, and the control cabinet (7) and the make-up water constant pressure device (44) are correspondingly arranged in the upper and lower two installation cavities of the second accommodation cavity (101).

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