JP2017190890A - Heat exchange type ventilator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchange type ventilator capable of selecting heat exchange ventilation operation or non-heat exchange ventilation operation according to a temperature of supplied airflow in a short time.SOLUTION: A heat exchange type ventilator includes sampling means 20 of acquiring a temperature of supplied airflow for each fixed time with a temperature sensor 19, and a comparison means 23 of comparing change of temperature acquired by the sampling means 20 with a prestored predetermined temperature change threshold. The heat exchange type ventilator, after the comparison result of the comparison means 23 indicates that the temperature change is made smaller than a predetermined temperature change thresholds, selects heat exchange ventilation operation or non-heat exchange ventilation operation according to the temperature of supplied airflow.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat exchange type ventilator.

  Conventionally, as shown in the schematic diagram of FIG. 6, this type of heat exchange type ventilator has a supply air passage 102 for supplying outdoor air to the main body 101 indoors, and an exhaust air passage for exhausting indoor air to the outside. 103, a heat exchange element 104 that exchanges heat between the supply air passage 102 and the exhaust air passage 103, an air supply fan 105 that generates a supply air flow through the supply air passage 102, and exhaust gas that passes through the exhaust air passage 103. 2. Description of the Related Art A heat exchange type ventilator including an exhaust fan 106 that generates a flow and a temperature sensor 107 that detects the temperature of a supply airflow is known.

  The conventional heat exchange type ventilator controls the heat exchange element 104 not to freeze from the temperature of the supply airflow detected by the temperature sensor 107. (For example, refer to Patent Document 1).

JP 2003-74937 A

  In such a conventional heat exchange type ventilator, in order to detect the temperature of the air supply airflow, it is assumed that the heat exchange air operation is performed at a constant period and in the shortest time. Specifically, a method for detecting in the shortest time is specifically described. There was a problem that could not be mentioned.

  An object of the present invention is to solve the above-mentioned problems and to provide a heat exchange type ventilator that selects a heat exchange air operation and a non-heat exchange air operation in a short time depending on the temperature of the supply airflow.

  In order to achieve this object, the heat exchange ventilator according to the present invention includes an air supply air passage that is an air supply passage from the outside to the room, and an air flow passage that exhausts air from the room to the outside. A certain exhaust air passage, a supply air flow generating means for generating a supply air flow passing through the supply air passage, an exhaust flow generating means for generating an exhaust flow passing through the exhaust air passage, and between the supply air flow and the exhaust flow A heat exchanging element that exchanges heat in the air supply path, a temperature sensor that detects the temperature of the air supply air upstream of the heat exchange element in the air supply air passage, and the air supply airflow at regular intervals through the temperature sensor Sampling means for acquiring the temperature of the apparatus, comparison means for comparing the temperature change acquired by the sampling means with a predetermined temperature change threshold stored in advance, and heat exchange air operation for performing the heat exchange via the heat exchange element And with the heat exchange And control means for selectively executing exhaust gas and non-heat exchange air operation including at least one of circulation or stop, wherein the control means has a result of comparison by the comparison means as the predetermined temperature change. The selection is performed based on the temperature of the supply airflow after the value becomes smaller than the threshold value, thereby achieving the intended purpose.

  According to the present invention, the heat exchange air operation and the non-heat exchange air operation can be selected in a short time depending on the temperature of the air supply air, and even when the outdoor temperature is low and the air supply air is cold, the air is supplied into the room from the indoor air supply port. It is possible to provide a heat exchange type ventilator that can shorten the feeling of cold air.

The structure schematic diagram of the heat exchange type | formula ventilation apparatus which concerns on Embodiment 1 of this invention. 1 is a schematic diagram of a circulation air path of a heat exchange type ventilator according to Embodiment 1 of the present invention. The temperature threshold diagram of the heat exchange type ventilator which concerns on Embodiment 1 of this invention. The operation | movement flowchart of the heat exchange type ventilator which concerns on Embodiment 1 of this invention. The temperature change figure of the supply airflow of the heat exchange type ventilator which concerns on Embodiment 1 of this invention. The schematic block diagram of a prior art.

  The heat exchange type ventilator according to the present invention includes an air supply air passage that is an air passage for supplying air from the outside to the room, an exhaust air passage that is an air passage for exhausting air from the room to the outside, and the air supply air passage. A supply air flow generation means for generating a supply air flow passing through, an exhaust flow generation means for generating an exhaust flow through the exhaust air passage, a heat exchange element for exchanging heat between the supply air flow and the exhaust flow, A temperature sensor that detects a temperature of the air supply air upstream of the heat exchange element in the air supply air passage, a sampling unit that acquires the temperature of the air supply air at regular intervals via the temperature sensor, and Comparison means for comparing the temperature change acquired by the sampling means with a predetermined temperature change threshold stored in advance, heat exchange operation for performing the heat exchange through the heat exchange element, and operation without the heat exchange. There is exhaust or circulation or stop Control means for selecting and executing non-heat exchange air operation including at least one, and the control means, after the comparison result by the comparison means becomes smaller than the predetermined temperature change threshold, The selection is performed on the basis of the temperature.

  Thereby, the time until it is determined that the temperature of the supply airflow is stable becomes short, and the heat exchange air operation and the non-heat exchange air operation can be selected in a short time depending on the temperature of the supply airflow.

  In addition, the comparison unit further stores in advance the temperature of the supply airflow after the comparison result between the change in temperature acquired by the sampling unit and the predetermined temperature change threshold becomes smaller than the predetermined temperature change threshold. When the comparison means compares the temperature of the supply airflow with the predetermined temperature threshold by the comparison means and the temperature of the supply airflow is equal to or lower than the predetermined temperature threshold, The non-heat exchange air operation may be selected, and the heat exchange air operation may be selected when the temperature of the supply air flow exceeds the predetermined temperature threshold.

  Thereby, the heat exchange air operation and the non-heat exchange air operation can be optimally selected depending on the temperature of the supply air flow.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following embodiments are examples embodying the present invention, and do not limit the technical scope of the present invention. In addition, throughout the drawings, the same portions are denoted by the same reference numerals, and the second and subsequent descriptions are omitted. Furthermore, in each drawing, the description of the details of each part not directly related to the present invention is omitted.

(Embodiment 1)
The heat exchanging ventilator 1 according to Embodiment 1 of the present invention is installed behind a ceiling in a building, in a side wall, or under the floor. Hereinafter, a case where it is installed under the floor will be described.

  FIG. 1 shows the configuration of the heat exchange type ventilator 1. The heat exchanging ventilator 1 has a rectangular parallelepiped shape, and has an outdoor suction port 3 for sucking outdoor air on one side surface 2 (left side in FIG. 1), and an outdoor exhaust port 4 for discharging indoor air to the outside. have.

  The opposing surface of the side surface 2 has an indoor exhaust port 5 for sucking indoor air and an indoor air supply port 6 for supplying air into the room.

  The heat exchanging ventilator 1 includes an air supply air passage 7 that communicates with the outdoor air inlet 3 and the indoor air intake port 6, and an exhaust air air passage 8 that communicates the indoor air outlet 5 and the outdoor air outlet 4. Yes. The circulation air passage 9 connecting the supply air passage 7 and the exhaust air passage 8 will be described in detail later.

  The heat exchanging ventilator 1 includes a sirocco-type air supply fan 10 as a supply air flow generation means in the supply air passage 7 and a sirocco-type exhaust fan 11 as an exhaust flow generation means in the exhaust air passage 8.

  The air supply fan 10 is connected to an air supply motor 12, and the exhaust fan 11 is connected to an exhaust motor 13. The fan is rotationally driven to generate an air flow in the air passage.

  A heat exchange element 14 for exchanging the heat of the indoor air and the outdoor air is disposed at a position where the supply air passage 7 and the exhaust air passage 8 intersect. The heat exchange element 14 has a function of collecting exhaust heat from the room and supplying it to the supply air from the outside.

  The heat exchanging ventilator 1 has an air supply damper 15 at the outdoor suction port 3, an exhaust damper 16 at the outdoor exhaust port 4, and an air supply air passage 7 in the vicinity of the outdoor suction port 3 and the outdoor exhaust port 4. A circulation damper 17 is provided for communicating with the exhaust air passage 8 through a communication passage. The supply damper 15, the exhaust damper 16 and the circulation damper 17 are connected to an electric motor (not shown), and the passage is opened and closed by switching the opening and closing of the damper. That is, when the air supply damper 15 is opened, the outdoor suction port 3 is opened, and when the air supply damper 15 is closed, the outdoor suction port 3 is closed. Moreover, the outdoor exhaust port 4 is opened when the exhaust damper 16 is opened, and the outdoor exhaust port 4 is closed when the exhaust damper 16 is closed. Further, when the circulation damper 17 is in the open state, the communication path is in an open state, and the exhaust air path and the supply air path are communicated. When the circulation damper 17 is closed, the communication passage is closed, and the exhaust air passage and the supply air passage are divided to become independent air passages. Here, examples of the electric motor include a gear motor driven by an AC voltage and a stepping motor driven by a DC voltage.

  When the heat exchange ventilator 1 is shut down, the air supply damper 15, the exhaust damper 16, and the circulation damper 17 are closed, and energization of the supply motor 12 and the exhaust motor 13 is stopped to supply and exhaust air and exhaust air. There is no flow.

  When the heat exchanging ventilator 1 performs heat exchange air operation, the air supply damper 15 and the exhaust damper 16 are opened, the circulation damper 17 is closed, and the air supply motor 12 and the exhaust motor 13 are energized to supply and Generate exhaust flow.

  When the heat exchange type ventilator 1 performs exhaust as non-heat exchange air operation, the air supply damper 15 and the circulation damper 17 are closed, the exhaust damper 16 is opened, and the current supply to the air supply motor 12 is stopped, and the exhaust motor Only an exhaust flow is generated by energizing 13.

  When the heat exchanging ventilator 1 circulates as non-heat exchange air operation, the air supply damper 15 and the exhaust damper 16 are closed, the circulation damper 17 is opened, and the air supply motor 12 and the exhaust motor 13 are energized. The circulation air passage 9 shown in FIG. 2 is formed. Here, as shown in FIG. 2, the circulation air passage passes through the exhaust air passage upstream of the indoor exhaust port 5, the exhaust air passage of the heat exchange element 14, and the exhaust air passage downstream, and further the air supply air passage upstream. The air path that passes through the air supply path of the heat exchange element 14 and reaches the downstream side of the air supply path.

  Further, as shown in FIG. 1, the heat exchanging ventilator 1 includes a control unit 18, a temperature sensor 19 that detects the temperature of the supply air flow upstream of the heat exchange element 14 in the supply air passage 7, and a temperature sensor 19. The sampling means 20, the 1st memory | storage means 21, the 2nd memory | storage means 22, and the comparison means 23 which acquire the temperature of supply airflow for every fixed time are provided.

  The control means 18 controls whether the air supply motor 12 and the exhaust motor 13 are energized and the opening / closing of the air supply damper 15, the exhaust damper 16, and the circulation damper 17 according to conditions. The control conditions will be described later.

  The 1st memory | storage means 21 memorize | stores the temperature change threshold value for comparing with the change of the temperature of the supplied airflow acquired by the sampling means 20 for every fixed time. Here, the fixed time of the sampling means 20 is about 30 seconds as a certain time interval in order to detect a temperature change, and the temperature change threshold is a temperature change to determine that the temperature of the supply airflow is stable. A value of about 0.5 ° C. is good as an almost nonexistent value.

  The 2nd memory | storage means 22 memorize | stores the temperature threshold value for selecting whether the heat exchange type ventilation apparatus 1 operate | moves by heat exchange air operation or non-heat exchange air operation. Here, the temperature threshold value may be a value as shown in FIG. 3 so as to select the non-heat exchange air operation when the heat exchange element 14 freezes. Specifically, as an example, the temperature threshold can be set to − (minus) 10 ° C. and −15 ° C. By providing two threshold values, it is possible to distinguish the three operation contents, and the operation contents are, for example, a heat exchange operation, a non-heat exchange operation (exhaust), and a non-heat exchange operation (circulation). Here, the exhaust and circulation of the non-heat exchange air operation is to prevent the freezing of the heat exchange element 14 while maintaining the ventilation in the winter, and the circulation has a negative pressure indoors when only the exhaust is performed. It is intended to prevent cool air feeling and dew condensation at the air inlet when cold air from the outside flows in through the gaps in the house.

  The comparison unit 23 compares the temperature change acquired by the sampling unit 20 with the temperature change threshold value, and determines that the temperature of the supplied airflow is stable when the comparison result becomes smaller than the temperature change threshold value. After determining that the temperature of the supply airflow is stable, the comparison unit 23 compares the temperature of the supply airflow with the temperature threshold shown in FIG. 3 and determines whether the temperature is smaller than the temperature threshold.

  From the comparison result of the comparison means 23, the control means 18 selects the non-heat exchange air operation when the temperature threshold is lower than −10 ° C., and performs the heat exchange air operation when the temperature of the supply air flow exceeds the temperature threshold −10 ° C. select. In the case of non-heat exchange air operation, if the temperature is lower than the second temperature threshold of −15 ° C., circulation is performed as non-heat exchange air operation, and if the temperature threshold exceeds −15 ° C., exhaust is performed as non-heat exchange air operation. Select.

  Next, in an environment where the room temperature is 20 ° C. and the outdoor temperature is −17 ° C., the control means 18 detects the temperature −17 ° C. of the supply air flow and selects the circulation as the non-heat exchange air operation. It demonstrates using the flowchart shown in FIG. In addition, S in FIG. 4 means a step.

First, the heat exchange type ventilation device 1 is started from a state where the heat exchange type ventilation device 1 is stopped from the heat exchange air operation by an operation switch (not shown). At this time, since the supply airflow was stopped until immediately before, the temperature of the supply airflow detected by the temperature sensor 19 is 20 ° C., which is the same as the room temperature indicated by the point (A) in FIG. (START)
The sampling means 20 counts the time for sampling and determines whether 30 seconds have passed as a sampling period. (S01)
When the sampling period of 30 seconds elapses, the temperature change is calculated from the difference between the previous temperature value 30 seconds before and the current temperature value. (S01Yes → S02)
Next, it is compared whether or not the temperature change is smaller than the temperature change threshold value 0.5 ° C. stored in advance. (S03 Yes) At this time, the temperature of the air supply air detected by the temperature sensor 19 is −17 ° C., which is the same as the outdoor temperature indicated by the point (B) in FIG.

If the temperature change exceeds the temperature change threshold of 0.5 ° C., it is determined that the temperature of the air supply air flow is not stable, and the process returns to step 1 (No in S03).
When it is determined that the temperature of the supply airflow is smaller than the temperature change threshold value, it is determined whether the temperature of the supply airflow is lower than a previously stored temperature threshold value of −10 ° C. If the temperature is lower, the process proceeds to step 5 to perform non-heat exchange operation. select. (S04 Yes)
When the temperature of the supply airflow exceeds the temperature threshold value −10 ° C., the process proceeds to step 8 and the heat exchange air operation is selected. (S04 No)
When the non-heat exchange air operation is selected, it is determined whether the temperature of the supplied air flow is lower than the previously stored temperature threshold value of −15 ° C. If the temperature is lower, the process proceeds to step 6 and circulation is selected as the non-heat exchange operation. (S05 Yes)
When the temperature of the supply airflow exceeds the temperature threshold value −15 ° C., the process proceeds to step 7 and exhaust is selected as the non-heat exchange operation. (S05No)
Thereby, the heat exchange air operation and the non-heat exchange air operation can be selected in a short time depending on the temperature of the supply airflow. Here, the operation for the use environment where the room temperature is 20 ° C. and the outdoor temperature is −17 ° C. has been described. However, for example, when the room temperature is as high as 25 ° C., until the temperature of the supply air flow is stabilized in Step 3. Although the time becomes longer, it can be selected in a short time by judging whether it is stable due to the temperature change. Thereby, even when the outdoor temperature is low and the air supply air is cold, the feeling of cold air supplied into the room through the indoor air supply port 6 can be shortened.

  In addition, although the case where either exhaust or circulation is selected as the non-heat exchange air operation has been described, even if a stop is added as the non-heat exchange air operation, the same operation can be selected in a short time. Can do.

  The ventilator according to the present invention selects a heat exchange air operation and a non-heat exchange air operation in a short time depending on the temperature of the supply airflow, and is useful for a heat exchange type ventilator used in a general house or the like. .

DESCRIPTION OF SYMBOLS 1 Heat exchange type ventilator 2 Side surface 3 Outdoor suction port 4 Outdoor exhaust port 5 Indoor exhaust port 6 Indoor air supply port 7 Air supply air channel 8 Exhaust air channel 9 Circulation air channel 10 Air supply fan 11 Exhaust fan 12 Air supply motor 13 Exhaust air Motor 14 Heat exchange element 15 Supply damper 16 Exhaust damper 17 Circulating damper 18 Control means 19 Temperature sensor 20 Sampling means 21 First storage means 22 Second storage means 23 Comparison means

Claims (2)

A supply air passage that is an air supply passage from the outside to the inside of the room,
An exhaust air passage that is an exhaust air passage from the room to the outside;
A supply air flow generating means for generating a supply air flow passing through the supply air flow path;
An exhaust flow generating means for generating an exhaust flow through the exhaust air passage;
A heat exchange element for exchanging heat between the supply airflow and the exhaust stream;
A temperature sensor for detecting the temperature of the air supply air upstream of the heat exchange element in the air supply air passage;
Sampling means for obtaining the temperature of the air supply air at regular intervals via the temperature sensor;
A comparison means for comparing the temperature change acquired by the sampling means with a predetermined temperature change threshold stored in advance;
A heat exchange operation that performs the heat exchange via the heat exchange element and a non-heat exchange operation that includes at least one of exhaust, circulation, or stop, which is an operation that does not involve the heat exchange, are selected and executed. Control means,
The control means includes
The heat exchange type ventilator that performs the selection based on the temperature of the air supply after the comparison result by the comparison means becomes smaller than the predetermined temperature change threshold. The comparison means includes
After the comparison result between the temperature change acquired by the sampling means and the predetermined temperature change threshold becomes smaller than the predetermined temperature change threshold, the temperature of the air supply is further compared with a predetermined temperature threshold stored in advance. And
The control means includes
In the comparison result between the temperature of the supply airflow and the predetermined temperature threshold value by the comparison means,
If the temperature of the supply airflow is less than or equal to the predetermined temperature threshold, select the non-heat exchange air operation,
The heat exchange type ventilator according to claim 1, wherein the heat exchange air operation is selected when the temperature of the supply air flow exceeds the predetermined temperature threshold.

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