Water heating system for sewage tank of passenger train

Abstract

The utility model discloses a water heating system for a sewage tank of a passenger train, which relates to the field of corollary equipment of the passenger train and comprises a boiler hot water circulating pipeline formed by connecting a hot water boiler and a heat exchanger in series and a sewage tank hot water circulating pipeline formed by connecting the heat exchanger, a circulating pump and a heating coil in series, and the heating coil is arranged in the sewage tank; a buffer water tank is arranged between the heat exchanger and the circulating pump, a control unit is further arranged in the heating system, and the control unit is electrically connected with the circulating pump, a temperature sensor in the sewage tank and a water level sensor in the buffer water tank. A hot water boiler provides a heat source, heat source equipment does not need to be added, and the limitation problem of sewage tank adding is solved; start and stop of the circulating pump are controlled through the temperature sensor and the control unit, the temperature of sewage in the sewage tank is maintained within a set interval, overheating is avoided while the anti-freezing problem is solved, and heat energy is saved; the buffer water tank can timely supplement water to the sewage tank hot water circulation pipeline, and the circulation and heating effects of the sewage tank hot water circulation pipeline are guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of railway passenger car supporting equipment, in particular to a water heating system for a railway passenger car sewage tank. Background Technique

[0002] The statements in this part only provide background technical information related to the utility model, and do not necessarily constitute prior art.

[0003] At present, due to environmental protection needs, railway passenger cars at home and abroad generally install sewage tanks under the car to collect domestic sewage generated on the car during vehicle operation, mainly including toilet, washbasin, dining car sewage and tea boiler wastewater. For low-temperature anti-freezing considerations, most sewage tanks are equipped with electric heating devices to heat the sewage tank in winter.

[0004] However, there are still some passenger cars using axle-end power generation in the current market. These cars are limited by the small power generation capacity, and the passenger cars do not have air conditioners, but hot water boilers are installed on the cars for heating in winter. For these passenger cars, due to the power generation capacity problem, they cannot provide electric heating for the sewage tank under the car, which limits the installation and application of the sewage tank. The train sewage still adopts the direct discharge method to be discharged along the railway line, which is not conducive to railway environmental protection. Summary of the Utility Model

[0005] In view of the above problems, the utility model provides a water heating system for a railway passenger car sewage tank, which can use the hot water of the hot water boiler to heat the sewage tank, solve the anti-freezing problem of the sewage tank, promote the popularization of the installation of the sewage tank, and help to promote the railway environmental protection cause.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] A water heating system for a railway passenger car sewage tank includes a hot water boiler. The hot water boiler is connected in series with a heat exchanger to form a boiler hot water circulation pipeline. The heat exchanger is connected in series with a circulation pump and a heating coil to form a sewage tank hot water circulation pipeline. The heating coil is arranged in the sewage tank. A buffer water tank is connected to the pipeline connected between the heat exchanger and the circulation pump. A control unit is also arranged in the heating system. The control unit is electrically connected to the circulation pump, and the control unit can control the start and stop of the circulation pump, so that the water in the sewage tank hot water circulation pipeline stops flowing.

[0008] Preferably, the heat exchanger includes two sets of mutually isolated pipelines, namely a boiler hot water circulation pipeline and a sewage tank hot water circulation pipeline. In the heat exchanger, the heat energy of the hot water in the hot water boiler can be transferred to the hot water in the sewage tank hot water circulation pipeline. The circulation pump drives the hot water in the sewage tank hot water circulation pipeline to perform heating circulation, and heats the sewage tank when flowing through the heating coil inside the sewage tank.

[0009] Preferably, the first water outlet of the hot water boiler is connected to the hot water inlet of the heat exchanger through a pipeline, and the first water inlet is connected to the cold water outlet of the heat exchanger through a pipeline, thus forming a boiler hot water circulation pipeline.

[0010] Preferably, the hot water outlet of the heat exchanger is connected to the second water inlet of the heating coil through a pipeline, and the cold water inlet of the heat exchanger is connected to the second water outlet of the heating coil through a pipeline; a circulation pump is provided on the pipeline connecting the hot water outlet of the heat exchanger and the second water inlet of the heating coil.

[0011] Preferably, the heating coil is arranged in an S shape in the sewage tank. The top plate of the sewage tank is provided with a first hole and a second hole. The first water inlet and the second water outlet of the heating coil respectively pass through the first hole and the second hole, and are respectively connected to the hot water outlet and the cold water inlet of the heat exchanger through pipelines, and are connected to the sewage tank hot water circulation pipeline.

[0012] Preferably, a temperature sensor is further arranged in the sewage tank, and the temperature sensor is electrically connected to the control unit; when the control unit receives that the water temperature in the sewage tank is lower than the lower limit of the temperature set by the temperature sensor, the control unit controls the circulation pump to start; when the control unit receives that the water temperature in the sewage tank is higher than the upper limit of the temperature set by the temperature sensor, the control unit controls the circulation pump to stop working.

[0013] Preferably, the buffer water tank is arranged at the highest point of the sewage tank hot water circulation pipeline. The buffer water tank needs to be filled with hot water. A third water outlet is arranged on the bottom plate of the buffer water tank, and the third water outlet is connected to the sewage tank hot water circulation pipeline through a pipeline; the middle of the top plate of the buffer water tank is open, and a third water inlet and a water level sensor are arranged on the top plate of the buffer water tank; the probe of the water level sensor is arranged at the middle and lower position in the buffer water tank, and the water level sensor is electrically connected to the control unit.

[0014] Preferably, the control unit is also electrically connected to an alarm.

[0015] Preferably, the buffer water tank replenishes water into the sewage tank hot water circulation pipeline, so that the water in the sewage tank hot water circulation pipeline is always in a full state; when the water level in the buffer water tank drops below the probe of the water level sensor, the control unit receives the low liquid level signal transmitted by the water level sensor, controls the alarm to give an alarm, prompts the staff to replenish water to the buffer water tank, and at the same time controls the circulation pump to stop working; when the staff completes the water replenishment of the buffer water tank, the control unit receives the water level signal transmitted by the water level sensor, controls the alarm to stop the alarm, and at the same time releases the control of the circulation pump from being prohibited from working.

[0016] Preferably, antifreeze is added to the heated water in the hot water circulation pipeline of the sewage tank.

[0017] Compared with the prior art, the advantages and positive effects of the present utility model are as follows:

[0018] The present utility model utilizes the original hot water boiler on the train to provide heat source, without the need to specially add heat source equipment. It uses the surplus boiler hot water to heat the sewage tank, solves the limitation problem of installing the sewage tank, and promotes the solution of the problem of direct sewage discharge along the railway line. Moreover, through heat exchange by the heat exchanger, the present utility model sets up two independent circulation pipelines, namely the hot water circulation pipeline of the sewage tank and the hot water circulation pipeline of the boiler. Antifreeze is added to the heated water in the hot water circulation pipeline of the sewage tank, which simplifies the operation of the system in winter and avoids the pollution of the boiler hot water by the antifreeze.

[0019] The present utility model controls the start and stop of the circulation pump through the sewage tank temperature sensor and the control unit, maintains the sewage temperature in the sewage tank within a set range, solves the antifreeze problem while avoiding overheating, and saves heat energy. The present utility model also sets up a buffer water tank to timely replenish water to the hot water circulation pipeline of the sewage tank, ensuring the circulation and heating effects of the hot water circulation pipeline of the sewage tank. Description of the Drawings

[0020] The specification drawings forming a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model.

[0021] Figure 1 is the overall schematic diagram of the embodiment of the present utility model;

[0022] In the figure:

[0023] 1 - hot water boiler, 11 - first water outlet, 12 - first water inlet, 2 - heat exchanger, 21 - hot inlet interface, 22 - cold outlet interface, 23 - hot outlet interface, 24 - cold inlet interface, 3 - circulation pump, 4 - sewage tank, 41 - first hole, 42 - second hole, 43 - temperature sensor, 5 - heating coil, 51 - second water inlet, 52 - second water outlet, 6 - buffer water tank, 61 - third water outlet, 62 - third water inlet, 63 - water level sensor, 7 - control unit, 8 - alarm. Detailed Embodiments

[0024] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanations of the present utility model. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present utility model belongs.

[0025] The following will combine with the attached drawings to describe the present utility model in detail. A water heating system for a railway passenger car sewage tank disclosed in this embodiment is as follows Figure 1 As shown, it includes a hot water boiler 1. The hot water boiler 1 and the heat exchanger 2 are connected in series to form a boiler hot water circulation pipeline. The heat exchanger 2, the circulation pump 3, and the heating coil 5 are connected in series to form a sewage tank hot water circulation pipeline. A buffer water tank 6 is also connected to the pipeline connected between the heat exchanger 2 and the circulation pump 3. A control unit 7 is further provided in this heating system. The control unit 7 is electrically connected to the circulation pump 3. The control unit 7 can control the start and stop of the circulation pump 3, so that the water in the sewage tank hot water circulation pipeline stops flowing.

[0026] As Figure 1 shown, the hot water boiler 1 is connected to the hot inlet interface 21 of the heat exchanger 2 through the first water outlet 11, and is connected to the cold outlet interface 22 of the heat exchanger 2 through the first water inlet 12, thus forming a boiler hot water circulation pipeline. The boiler hot water circulation pipeline relies on the density difference of water and realizes natural circulation through heat convection.

[0027] As Figure 1 shown, the hot outlet interface 23 of the heat exchanger 2 is connected to the second water inlet 51 of the heating coil 5 through a pipeline, and the cold inlet interface 24 of the heat exchanger 2 is connected to the second water outlet 52 of the heating coil 5 through a pipeline; a circulation pump 3 is provided on the pipeline connecting the hot outlet interface 23 of the heat exchanger 2 and the second water inlet 51 of the heating coil 5. The circulation pump 3 is connected to the pipeline by existing technology and is used for the water circulation movement of the pipeline. The circulation pump 3, the heat exchanger 2, and the heating coil 5 are connected in series to form a sewage tank hot water circulation pipeline.

[0028] The heat exchanger 2 contains two sets of mutually isolated pipelines, namely the boiler hot water circulation pipeline and the sewage tank hot water circulation pipeline. It can be understood that the boiler hot water in the boiler hot water circulation pipeline and the heating water in the sewage tank hot water circulation pipeline are not connected. When the train is running, the hot water boiler is always heating the boiler hot water. The boiler hot water continuously provides heat to the heat exchanger through the boiler hot water circulation pipeline, and the heat exchanger transfers the heat transferred by the boiler hot water circulation pipeline to the heating water in the sewage tank hot water circulation pipeline.

[0029] The heating coil 5 is arranged in an S shape in the sewage tank 4 and is used for heating the inside of the sewage tank 4. The top plate of the sewage tank 4 is provided with a first hole 41 and a second hole 42. The first water inlet 51 and the second water outlet 52 of the heating coil 5 respectively pass through the first hole 41 and the second hole 42, and are thus respectively connected to the hot outlet interface 23 and the cold inlet interface 24 of the heat exchanger 2 through pipelines, and are connected to the sewage tank hot water circulation pipeline.

[0030] A temperature sensor 43 is also provided in the sewage tank 4. The temperature sensor 43 is electrically connected to the control unit 7 and is used to transmit the temperature to the control unit 7 in real time. When the control unit 7 receives that the water temperature in the sewage tank 4 is lower than the lower limit of the temperature set by the temperature sensor 43, the control unit 7 controls the circulation pump 2 to start. At this time, the water in the hot water circulation pipeline of the sewage tank starts to circulate. The circulating water absorbs heat in the heat exchanger 2 and then heats up, and circulates to the heating coil 5 to heat the sewage tank 4. When the control unit 7 receives that the water temperature in the sewage tank 4 is higher than the upper limit of the temperature set by the temperature sensor 43, the control unit 7 controls the circulation pump 2 to stop working at this time, and the water in the hot water circulation pipeline of the sewage tank stops circulating.

[0031] As Figure 1 shown, the buffer water tank 6 is arranged at the highest point of the hot water circulation pipeline of the sewage tank. The buffer water tank 6 needs to be filled with hot water. A third water outlet 61 is arranged on the bottom plate of the buffer water tank 6. The third water outlet 61 is connected to the hot water circulation pipeline of the sewage tank through a pipeline, and the pipeline adopts the existing technology when connecting to the hot water circulation pipeline of the sewage tank. The top plate of the buffer water tank 6 has an opening in the middle. Looking down at the top plate of the buffer water tank 6 is like a "hui" character. A third water inlet 62 and a water level sensor 63 are arranged on the top plate of the buffer water tank 6. The probe 631 of the water level sensor 63 is arranged at the middle and lower position of the buffer water tank 6. The water level sensor 63 is electrically connected to the control unit 7 and is used to transmit the water level information in the buffer water tank 6 to the control unit 7 in real time. The control unit 7 is also electrically connected to an alarm 8.

[0032] During operation, since the top plate of the buffer water tank 6 has an opening in the middle and the buffer water tank 6 is located at the highest point of the hot water circulation pipeline of the sewage tank, when the volume of the heated water in the pipeline changes slightly due to thermal expansion and contraction, evaporation and slight leakage in the hot water circulation pipeline of the sewage tank, the water in the buffer water tank 6 can supplement water to the hot water circulation pipeline of the sewage tank in time under the action of gravity, so that the water in the hot water circulation pipeline of the sewage tank is always in a full state, ensuring the circulation and heating effects. When the water loss in the hot water circulation pipeline of the sewage tank due to evaporation or leakage is large, and the buffer water tank 6 replenishes water to the hot water circulation pipeline of the sewage tank, resulting in the water level in the buffer water tank 6 dropping below the probe 631 of the water level sensor 63, the control unit 7 receives the low liquid level signal transmitted by the water level sensor 63, and then controls the alarm 8 to give an alarm, prompting the staff to replenish water to the buffer water tank 6. At the same time, it will also control the circulation pump 2 to stop working.

[0033] After the staff completes the water replenishment of the buffer water tank 6, the control unit 7 receives the water level signal transmitted by the water level sensor 63, controls the alarm 8 to stop alarming, and at the same time releases the control of prohibiting the circulation pump 2 from working.

[0034] The control unit 7 uses a PLC controller in the prior art and can receive the signals of the temperature sensor 43 and the water level sensor 63. Through internal programming of the PLC controller, the input signals are converted into output signals and transmitted to the devices to be controlled: the circulation pump 2 and the alarm 8.

[0035] Antifreeze is added to the heated water in the hot water circulation pipeline of the sewage tank. This enables the hot water circulation pipeline of the sewage tank not to freeze even when the heated water in the hot water circulation pipeline of the sewage tank is not emptied during vehicle storage. Moreover, through the heat exchanger, the boiler hot water and the heated water are completely isolated, avoiding the pollution of the boiler hot water by the antifreeze.

[0036] Although the specific embodiments of the present invention are described above in conjunction with the accompanying drawings, it is not a limitation on the protection scope of the present invention. Those skilled in the art should understand that, based on the technical solution of the present invention, various modifications or deformations that can be made by those skilled in the art without creative efforts are still within the protection scope of the present invention.

Claims

1. A railway passenger car sewage tank water heating system, characterized in that: It includes a hot water boiler, which is connected in series with a heat exchanger to form a boiler hot water circulation pipeline. The heat exchanger, a circulation pump and a heating coil are connected in series to form a sewage tank hot water circulation pipeline. The heating coil is arranged in the sewage tank; a buffer water tank is connected to the pipeline connected between the heat exchanger and the circulation pump. A control unit is also provided in the heating system. The control unit is electrically connected to the circulation pump and can control the start and stop of the circulation pump; the control unit is also electrically connected to an alarm.

2. A railway passenger car sewage tank water heating system as claimed in claim 1, characterized in that: The heat exchanger comprises two sets of mutually isolated pipelines, namely a boiler hot water circulation pipeline and a sewage tank hot water circulation pipeline.

3. A railway passenger car sewage tank water heating system as claimed in claim 1, characterized in that: The first water outlet of the hot water boiler is connected to the hot inlet interface of the heat exchanger through a pipeline, and the first water inlet is connected to the cold outlet interface of the heat exchanger through a pipeline to form a boiler hot water circulation pipeline.

4. A railway passenger car sewage tank water heating system as claimed in claim 1, characterized in that: The hot outlet interface of the heat exchanger is connected to the second water inlet of the heating coil through a pipe, and the cold inlet interface of the heat exchanger is connected to the second water outlet of the heating coil through a pipe; a circulating pump is arranged on the pipeline connecting the hot outlet interface of the heat exchanger and the second water inlet of the heating coil.

5. A railway passenger car sewage tank water heating system as claimed in claim 4, characterized in that: The heating coil is arranged in an S-shape in the sewage tank, and a first hole and a second hole are opened on the top plate of the sewage tank. The first water inlet and the second water outlet of the heating coil pass through the first hole and the second hole respectively, and are respectively connected to the hot outlet interface and the cold inlet interface of the heat exchanger through pipes, and are connected to the hot water circulation pipeline of the sewage tank.

6. A railway passenger car sewage tank water heating system as claimed in claim 1, characterized in that: A temperature sensor is also provided in the sewage tank, and the temperature sensor is electrically connected to the control unit; when the control unit receives a signal that the water temperature in the sewage tank is lower than the lower limit of the temperature set by the temperature sensor, the control unit controls the circulation pump to start; When the control unit receives information that the water temperature in the sewage tank is higher than the upper temperature limit set by the temperature sensor, the control unit controls the circulation pump to stop operating.

7. A railway passenger car sewage tank water heating system as claimed in claim 1, characterized in that: The buffer water tank is arranged at the highest point of the hot water circulation pipeline of the sewage tank. The buffer water tank needs to be filled with hot water. A third water outlet is arranged on the bottom plate of the buffer water tank, and the third water outlet is connected to the hot water circulation pipeline of the sewage tank through a pipe; the middle of the top plate of the buffer water tank is opened, and a third water inlet and a water level sensor are arranged on the top plate of the buffer water tank; the probe of the water level sensor is arranged in the middle and lower position in the buffer water tank, and the water level sensor is electrically connected to the control unit.

8. A railway passenger car sewage tank water heating system as claimed in claim 1, characterized in that: Antifreeze is added to the heating water in the hot water circulation pipeline of the sewage tank.

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