JPH0640774U - Heat source fluid supply device for heat pump type heat source machine - Google Patents

Abstract

(57) [Summary] [Objective] Even when wastewater containing contaminants such as raw sewage is filtered by a strainer, a supply device which does not need to supply city water for backwashing is obtained. [Structure] A plurality of strainers for removing impurities are provided in a heat source fluid line 3 for sending raw sewage from a sand basin 40 to a heat source device 1 as a heat source fluid. Further, in order to supply the filtered drainage water of the strainer as water for backwashing this strainer, a backwash water line 7 provided with a booster pump 9 is branched from the heat source fluid line after the strainers 5a and 5b and connected to each strainer. is doing. [Effect] Since the wastewater filtered by the strainer is supplied as backwash water, there is no need to supply expensive city water from another system. Moreover, new drainage is not generated due to backwashing of the strainer.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 INDUSTRIAL APPLICABILITY The present invention is cooling water or heat source water used in a heat pump type heat source machine such as an air conditioner (hereinafter, both cooling water used as a cooling fluid and heat source water used as a heating fluid are collectively referred to as a heat source fluid). The present invention relates to a device for supplying wastewater containing solid contaminants, and more particularly to a supplier suitable for application when sewage containing a large amount of contaminants is used as a heat source fluid.

[0002]

[Prior art]

 In recent years, in heat pump type heat source machines, technological development has been carried out in which water or sewage from rivers flowing through the city is supplied as a heat source fluid to effectively use city exhaust heat. The temperature of these waters is higher in winter and lower in summer than the air that is generally supplied, and the range of temperature fluctuations during the year is small.Therefore, when this water is used as the heat source fluid of a heat pump, the efficiency is improved throughout the year. You can drive well. In particular, in the case of sewage, the fluctuation range of the temperature is small, so it is a very preferable fluid from the viewpoint of utilization of urban waste heat. However, sewage, especially untreated sewage (hereinafter referred to as raw sewage), contains a large amount of miscellaneous impurities, and if this is directly supplied to a heat pump, the equipment at the supply destination may become blocked. There will be problems such as reduced performance. For this reason, when supplying raw sewage, contaminants are removed by filtration.

Conventionally, in a heat pump type heat source machine that supplies sewage as a heat source fluid, sewage is supplied by a supply device shown in FIG. In this figure, 1 is a heat source unit for air conditioning equipment, 1a is a heat recovery type heat pump, 1b is a water source heat pump, and 1c is a turbo refrigerator. Further, 40 is a sand basin, and 2 is a pump for pumping raw sewage from the sand basin 40.

In this heat source fluid supply device, in order to supply raw sewage as a heat source fluid to the heat source device 1, the heat source fluid is supplied between the pump 2 for pumping the raw sewage installed in the sand basin 40 and the heat source device 1. Line 3 is provided. The heat source fluid supply line 3 is branched at a part of the middle thereof to form a plurality of flow paths including a first flow path 3a and a second flow path 3b. The two flow passages 3a and 3b are provided with two strainers 4a and 5a and two strainers 4b and 5b, respectively. A heat source fluid discharge line 6 is connected to the heat source fluid outlets of the heat recovery type heat pump 1a, the water heat source heat pump 1b, and the turbo chiller 1c, and the other end of the heat source fluid discharge line 6 is set with sand. It reaches pond 40.

A backwash water supply line 7 is connected to each of the strainers 4a and 5a and strainers 4b and 5b, and a backwash water discharge line 8 is connected to a backwash water outlet of each strainer. The end reaches the sand basin 40. In order to supply backwash water to the strainer, a backwash water tank 30 for storing clear water such as tap water and industrial water is provided. The backwash water tank 30 is connected to the backwash water supply line 7. 31 is a backwash water pump for sending clear water.

Supply of the heat source fluid by the supply device configured as described above is performed as follows. Raw sewage is pumped up from the sand basin 40 by the pump 2, and the raw sewage is passed through the heat source fluid supply line 3 to the strainers 4a and 5a and the strainers 4b and 5b. The filtered sewage that has passed through the strainer is supplied to each heat source unit of the heat recovery type heat pump 1a, the water heat source heat pump 1b, and the turbo refrigerator 1c (only the device in operation). The filtered sewage discharged from each heat source machine is returned to the sand basin 40 via the heat source fluid discharge line 6. The filtered sewage discharged from the heat source unit is sent to the treatment facility together with the sewage flowing through the sand basin 40.

The strainer that has been clogged by the passage of raw sewage is backwashed. In this case, after stopping the flow of raw sewage to the clogged strainer, clear water is supplied from the backwash water tank 30 for backwashing.

[0008]

However, in the above-mentioned conventional technique, city water such as tap water or industrial water is used as backwash water for the strainer, but drainage water containing a large amount of impurities such as sewage is used. When water is filtered with a strainer, it must be backwashed frequently, and a large amount of expensive city water supplied from another system is consumed. Furthermore, since backwash water is supplied from a separate system, a large amount of new wastewater is generated by backwashing the strainer. For this reason, the amount of wastewater that must be sent to the treatment facility for treatment increases, and the load on the treatment facility increases.

The present invention provides a heat source fluid supply device that does not need to supply city water for backwashing even when drainage containing contaminants such as raw sewage is filtered by a strainer. The purpose is to

[0010]

[Means for Solving the Problems]

 In order to achieve the above object, in the present invention, a backwash water line, which is branched from a heat source fluid line after the strainer and has a booster pump, is connected to the backwash water inlet of the strainer.

[0011]

[Action]

 When the wastewater containing a large amount of foreign substances is sent to the heat source machine by the supply device of the present invention, the wastewater is filtered with a strainer to remove the foreign substances, and when the strainer is clogged, the filtered drainage after passing through the strainer. To perform backwash.

In the present invention, in order to prevent the generation of new waste water, the waste water filtered by the strainer is used as the backwash water for the strainer. If the filtered wastewater is backwashed, the drainage will not increase even if the strainer is backwashed frequently. In this way, in order to turn the filtered wastewater that has passed through the strainer into backwash water, a branch is provided in the heat source fluid line after the strainer, and this branch is connected to the backwash water inlet of each strainer.

[0013]

Embodiment FIG. 1 is a view showing an embodiment of the present invention. In this figure, the same components as those in FIG. 2 are designated by the same reference numerals and the description thereof will be omitted. In the present embodiment, the heat source fluid discharge line 6 provided between the heat recovery type heat pump 1a, the water heat source heat pump 1b, the turbo chiller 1c, and the sand basin 40 is branched. The backwash water supply line 7 is connected. Reference numeral 9 is a booster pump.

In the feeder configured as described above, the backwash of the strainer is performed as follows. Raw sewage supplied from the heat source fluid supply line 3a or 3b in which the strainer is arranged when the differential pressure measured by a pressure gauge (not shown) provided before and after each strainer reaches a predetermined value. Stop the flow of water and suspend one strainer. Next, the filtered sewage increased in pressure is supplied from the backwash water supply line 7 to the stopped strainer to backwash it. Then, after a lapse of a predetermined time after passing the filtered sewage which is the backwash water, the passage of the filtered sewage is stopped and the supply of raw sewage is started from the heat source fluid supply line 3a or 3b.

In this embodiment, the case where there are two strainers has been described. However, it is desirable that the flow rate fluctuation of the filtered sewage during backwashing is as small as possible. It is better to increase the number so that the ratio of the resting sequence due to backwashing becomes smaller. Further, the backwash water supply line 7 is connected to the heat source fluid discharge line 6 in order to draw out the backwash water for the strainer, but the backwash water is not limited to the heat source fluid discharge line 6. The heat source fluid supply line 3 between the strainer and the heat source device 1 may be used.

[0016]

[Effect of device]

 In the present invention, the wastewater filtered by the strainer is supplied as backwash water, so there is no need to supply expensive city water from another system. Moreover, no new wastewater is generated due to backwashing of the strainer, and the amount of wastewater to be treated does not increase.

Further, since the backwash water supply line for backwashing the strainer is branched from the heat source fluid discharge line and the two lines are directly connected, it is necessary to install a water tank for storing backwash water. Therefore, it is possible to avoid an increase in site area and equipment costs.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing a conventional device for supplying raw sewage as a heat source fluid.

[Explanation of symbols]

 1 heat source machine 2 pump for pumping raw sewage 3 heat source fluid supply line 4a, 4b, 5a, 5b strainer 6 heat source fluid discharge line 7 backwash water supply line 8 backwash water discharge line 9 booster pump 40 sand basin

Claims (1)

[Scope of utility model registration request] 1. A heat source fluid supply device for a heat pump type heat source machine, wherein waste water containing solid contaminants is supplied as a heat source fluid, and a strainer is provided in a heat source fluid line between the source of the waste water and the heat source machine, A heat source fluid supply device for a heat pump type heat source machine, characterized in that a backwash water line branched from a heat source fluid line after the strainer and provided with a booster pump is connected to a backwash water inlet of the strainer.