JPH02254053A - Method and device for discharging drain for air conditioning device - Google Patents

Abstract

PURPOSE:To enable execution of smooth discharge of drain without being influenced by a fluctuation in a pressure from the outside of a car by a method wherein a discharge pump having a high lift and discharging drain in a drain pan mounted facing an indoor heat exchanger is run during cooling operation of an air conditioning device. CONSTITUTION:An air conditioning device 1 mounted to a railroad car is provided in an indoor device part with a heat exchanger 2 on the indoor side and an indoor blower 4, and in an outdoor device chamber part with a heat exchanger 3 on the outdoor side, an outdoor blower 5, and a compressor 6. The heat exchanger 2 on the indoor side has a drain pan 8 to receive drain being condensate, and drain in the drain pan 8 is discharged to the outside through a drain pipe 10, in which a cutoff valve 9 is located, through running of a discharge pump 7. In this case, a pump having a high lift is employed as the discharge pump 7, and control is effected such that, during cooling operation of an air conditioning device, the discharge pump 7 is run and the cutoff valve 9 is opened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a drain discharge method and device for an air conditioner, and in particular to a drain discharge method and gt device suitable for an air conditioner installed in a railway vehicle. It is related to.

[Conventional technology]

BACKGROUND ART In air conditioners installed in railway vehicles, various efforts have been made to provide a structure for smoothly draining condensed ice, that is, condensation on an indoor heat exchanger. For example, a structure is known in which a cut plate with a hole for draining from an indoor heat exchanger is installed in the frame of an air conditioner, and the drain is drained from the hole (Public Patent Publication No. 55-83412). ing. Further, in general air conditioners, there is known a drainage device (Public Utility Model Publication No. 1-8895) that pumps drain in a drain receiver to the upper part using a drain pump and drains the water.

[Problem to be solved by the invention]

In recent years, railway vehicles have begun to travel at high speeds, and a phenomenon has occurred in which the pressure outside the vehicle rapidly fluctuates while traveling in a tunnel.

In particular, when trains pass each other in a tunnel, the above-mentioned external pressure fluctuations become a problem. For this reason, in vehicles running at high speed, the vehicle body is constructed to be airtight to prevent the reaction of pressure outside the vehicle from propagating into the interior of the vehicle.

However, sufficient consideration has not been given to the drain discharge structure of the above-mentioned air conditioner. That is, even though the car body has an airtight structure, holes are provided for draining water, making it impossible to ensure sufficient airtightness for the guard. Furthermore, there is a risk that pressure fluctuations outside the vehicle may occur during drain drainage, causing the drain to flow backwards, blow out, and be sent into the passenger compartment by the indoor blower. To provide a drain draining method and device for an air conditioner that is not affected by pressure fluctuations.4.2 [Means for solving the problem] In order to achieve the above object, draining from the drain receiver is provided. A discharge pump with a high head is operated during cooling operation of the air conditioner.

Moreover, it is constructed from a discharge pump for discharging drain from a drain receiver disposed corresponding to the indoor heat exchanger, and a valve provided in a drain flow path of the discharge pump.

[For production]

By discharging condensate only during cooling operation of the air conditioner, in which condensate is generated by a discharge pump with a high head, it is possible to prevent a decrease in airtightness and backflow of condensate.

In addition, a valve is provided in the drain flow path of the discharge pump that discharges the drain, and the flow path is opened and closed as necessary, so that the drain can be discharged while ensuring the airtightness of the vehicle body.

[Actual flow side]

Hereinafter, one embodiment and other embodiments of the present invention will be described with reference to FIGS. 1 to 5. 1 to 4 show an embodiment of the present invention, in which numeral 1 denotes an air conditioner, which is composed of an outdoor equipment room and an indoor equipment room. 2 is an indoor heat exchanger installed in the indoor equipment room. 3 is an outdoor heat exchanger installed in the outdoor 82 chamber section. 4 is the indoor heat exchange ##
This is an indoor blower that guides return air from the room and fresh outside air to 2, and blows the conditioned air 2 after heat exchange into the room.

5 is an outdoor blower for blowing air to the outdoor heat exchanger. 6 is a compressor that constitutes the refrigeration cycle. Reference numeral 7 denotes a discharge pump, which has its water suction port disposed within a drain receiver 8 that receives condensed water or condensate from the indoor heat exchanger 2, and discharges the condensate. Reference numeral 9 denotes a shutoff valve attached to the drain pipe IO, which is the drain flow path system of the moe discharge pump 7. Note that the shutoff valve 9 may be installed on the suction side of the discharge pump 7.

Next, the control system for the discharge pump 7 and the shutoff valve 9 will be explained. FIG. 4 shows a power supply circuit for the discharge pump 7 and the shutoff valve 9, and C in the figure is a relay that operates when the air conditioner l is in cooling operation. If the relay C
r operates, and the discharge pump 7 and shutoff valve 9 to which its a contact is connected operate. That is, the drain pump 7 performs a drainage operation, and the shutoff valve 9 opens its flow path. Incidentally, in addition to being closed by σU by the operation of the relay Cr, the shutoff valve 9 has at least the function of a check valve to prevent backflow from the outside of the vehicle to the inside of the vehicle.

According to such a configuration, when the air conditioning system [1 is being operated for cooling, the discharge pump 7 operates to discharge water to the outside of the vehicle. At this time, the shutoff valve 9 is open. Therefore, condensed water generated from the indoor heat exchanger 2 can be forcibly discharged to the outside of the vehicle.

In addition, non-membrane pumps generate a certain head when the pump is filled with liquid, but when the pump is not filled with liquid, the head drops rapidly. There's a problem. Therefore, in the embodiment, the shutoff valve 9 is provided with a check valve function, so that when the inside of the drain pump 7 is not filled with liquid, the pressure outside the vehicle suddenly increases and the drain receiver 8
The structure is designed to prevent the slight amount of drain remaining inside from scattering.

By the way, if another switch is provided in the control system of the discharge pump 7, the drawbacks of the non-displacement pump can be compensated for. That is, a drain amount detection switch is provided to detect when a predetermined amount of drain has accumulated in the drain receiver 8, and the drain pump 7 is activated only when a predetermined amount or more of drain has accumulated in the drain receiver 8.
The structure may be such that the check valve 9 is operated.

Next, another embodiment according to the present invention will be described with reference to FIG. In the figure, reference numeral 11 denotes a normal abnormal condition detector outside the vehicle, which detects a state in which the vehicle is running in a tunnel, where large fluctuations in external pressure occur. Specifically, methods for detecting tunnel running conditions include a method of installing a ground signal @ transmitter at each entrance or exit of the tunnel and receiving and detecting it with a receiver on the vehicle, or a method of detecting a point from a point detection means on the track. Possible means include detecting the state of running in a tunnel by comparing the information with the track information installed on the vehicle.

Furthermore, if the responsiveness of the detector is improved, a pressure detector that directly detects the pressure outside the vehicle may be used. W" is a relay that operates during warm weather, and completely stops the discharge pump 7 and closes the shutoff valve 9 when the air conditioner 1 is in operation.

In such a configuration, when the vehicle approaches a tunnel or when the detector IJ detects an abnormality in external pressure such as a sudden change in external pressure, or a hearing loss, the shutoff valve 9 is forcibly closed. This prevents pressure fluctuations outside the vehicle from propagating into the interior of the vehicle, and prevents drain from scattering or fluctuating the pressure inside the vehicle.

According to such a configuration, by detecting the conditions that cause pressure fluctuations outside the vehicle using the detector 11, it is possible to appropriately control the opening and closing of the shutoff valve 9, and it is possible to improve drain discharge efficiency and prevent fluctuations in the pressure inside the vehicle. .

By the way, in each of the above-mentioned embodiments, a non-displacement pump was used as the discharge pump, but if a displacement pump is used, a shutoff valve becomes unnecessary and the structure can be simplified. However, since return air from the room is sent to the indoor heat exchanger, the condensed water, that is, the drain, contains a large amount of dust. Therefore, it is necessary to install an efficient filter device or the like.

In the above embodiments, an example of a heat pump type air conditioner that performs cooling and heating is described as an air conditioner, but the present invention is not limited to these embodiments, and may be applied to ordinary cooling equipment. A similar effect can be obtained with rose bushes.

〔Effect of the invention〕

As explained above, according to the present invention, drain can be discharged smoothly and is not affected by pressure fluctuations outside the vehicle.

[Brief explanation of drawings]

FIG. 1 is a plan view of an air conditioner equipped with an embodiment of a drain discharge device according to the present invention, FIG. 2 is a cross-sectional view of the A-inlet section in FIG. 1, and FIG. 3 is a cross-sectional view of the B-B section in FIG. Figures 4 and 5
The figure is a control circuit diagram of one embodiment and another embodiment. 1... Air conditioner, 2... Indoor heat exchanger, 4... Indoor blower, 7... Discharge pump power l Figure 3

Claims (1)

[Scope of Claims] 1. A drain for an air conditioner, characterized in that a discharge pump with a high lift for discharging the drain in a drain receiver provided corresponding to an indoor heat exchanger is operated during cooling operation of the air conditioner. Discharge method. 2. A discharge pump for discharging the drain in the drain receiver provided corresponding to the indoor heat exchanger is operated during cooling operation of the air conditioner, and a valve provided in the drain flow path of the discharge pump is operated in the air conditioner. A drain discharge method for an air conditioner characterized by opening the circuit during cooling operation. 3. A discharge pump for discharging the drain from the drain receiver provided corresponding to the indoor heat exchanger is operated during cooling operation of the air conditioner, and the valve provided in the drain passage of the discharge pump is operated when the vehicle is in a tunnel. A drain discharge method for an air conditioner characterized in that the circuit is closed when the air conditioner is running indoors. 4. In a drain discharge device for an air conditioner for a railway vehicle, which consists of an outdoor heat exchanger, an indoor heat exchanger, an outdoor blower, an indoor blower, a compressor, and an expansion mechanism, a drain receiver is placed corresponding to the indoor heat exchanger. 1. A drain discharge device for an air conditioner, comprising: a discharge pump for discharging drain; and a valve provided in a drain passage of the discharge pump. 5. In a drain discharge device for an air conditioner for a railway vehicle, which consists of an outdoor heat exchanger, an indoor heat exchanger, an outdoor blower, an indoor blower, a compressor, and an expansion mechanism, the drain receiver is placed in correspondence with the indoor heat exchanger. and a valve provided in the drain flow path of the discharge pump to automatically close the flow path in response to the operating condition of the air conditioner and the running condition of the railway vehicle. Features: Drain discharge device for air conditioners.