WO2015083297A1

WO2015083297A1 - Heat exchanger for air conditioner

Info

Publication number: WO2015083297A1
Application number: PCT/JP2013/083426
Authority: WO
Inventors: 久人小田; 直樹相京; 忠敬才野
Original assignee: 新晃工業株式会社
Priority date: 2013-12-05
Filing date: 2013-12-13
Publication date: 2015-06-11
Also published as: JP2015108489A

Abstract

[Problem] To provide a heat exchanger for an air conditioner wherein control is performed with a simple constitution and with no need for a bypass route or a bypass damper so that the necessary air-conditioning is achieved and the coil outlet water temperature reaches a predetermined temperature. [Solution] A heat exchanger having an inlet header and outlet header bridged by a plurality of main water pipes which let a heating medium pass therebetween to perform heat exchange, said heat exchanger being provided with a main water pipe control mechanism for selecting main water pipes which let the heating medium pass therethrough and main water pipes which block the heating medium. Main water pipes for letting water pass therethrough are selected by means of the main water pipe control mechanism in order to perform control to achieve the required air-conditioning state.

Description

Air conditioner heat exchanger

This invention relates to the heat exchanger which heat-exchanges the air of an air conditioner.

Conventionally, a consumer who receives heat supply from a district heat supply company may adopt a bleed-in method in order to secure a heat medium temperature difference to the heat supply company. In this bleed-in method, a part of the heat medium used by the customer is mixed with the sent heat medium with a mixing valve, etc., to ensure the heat medium temperature, It is known that the return water temperature is lower than the design value depending on the outside air condition and the customer's air conditioning control system. The same is also known for individual heat source systems.

When the temperature difference of the heat medium cannot be ensured, there is a large amount of water required by customers, which may lead to insufficient heat supply to other customers. In addition, the energy consumption increases due to the increase in pump conveyance power and the number of operating refrigerators.
For this reason, an air conditioning system as disclosed in Patent Document 1 has been proposed. This technology circulates and supplies cold / hot water to the heat exchanger of the fan coil device A, and allows the cold / hot water and air to exchange heat by passing outside air and indoor air through the heat exchanger, and connects to the heat exchanger. The temperature of the cool / warm water in the return water pipe is detected, and the amount of cool / warm water passing through the heat exchanger is controlled to increase or decrease so that the cool / warm water temperature becomes a predetermined temperature, while a bypass is provided to bypass the heat exchanger. In this bypass path, a bypass air volume variable damper that varies the amount of air that bypasses the heat exchanger is arranged, and the detector detects the temperature of the air conditioning system, such as the temperature in the air conditioned space and the supply air temperature to the air conditioned space. The amount of control target is detected, and the bypass air volume variable damper is controlled according to the detected value so that the air passing through the heat exchanger has a desired temperature, and as a result, the amount of air passing through the bypass path and Go through heat exchanger It will control the ratio of the air amount.

In addition, when the water amount is controlled so that the return water temperature of the heat exchanger (coil) becomes a predetermined temperature, the air temperature at the outlet of the heat exchanger becomes undesired, resulting in inconvenience in the temperature control of the air conditioner, Since there is a case where the control cannot be performed at a low load and the water temperature difference cannot be secured, the applicants, as disclosed in Patent Document 2, correspond to means for controlling the coil outlet air temperature of the heat exchanger. As described above, a bypass path is provided in the coil which is a heat exchanger, and the coil outlet air volume and the bypass air volume are mixed and controlled so that the coil outlet air temperature is constant and the coil outlet water temperature is controlled to be a predetermined temperature by the water amount control. A bypass damper type air conditioning system has been proposed.

JP 2004-125316 A JP 2007-17135 A

However, even when the coil outlet water temperature of the heat exchanger of the above prior art air conditioner is controlled, there is a problem that the coil outlet temperature does not become a predetermined temperature at a low load and the water temperature difference may not be secured. It was.
In addition to the coil area of the heat exchanger, the area of the bypass damper is required, and the size of the air conditioner is larger than usual.
The present invention has been made in view of the above-described problems, and does not require a bypass passage or a bypass damper, and can control air conditioning necessary with a simple configuration and coil outlet water temperature to a predetermined temperature. Is to provide a heat exchanger for the machine.

In order to solve the above-mentioned problem, the invention of claim 1 is a heat exchanger in which a plurality of water flow main pipes that exchange heat by passing a heat medium between an inlet header and an outlet header are spanned. A water flow main pipe control mechanism that selects the water flow main pipe that passes through and the water flow main pipe that cuts off the heat medium is provided, and the water flow main pipe control mechanism selects the water flow main pipe that passes through and controls it to the required air conditioning state. It is a heat exchanger for an air conditioner.
According to a second aspect of the present invention, in the heat exchanger for an air conditioner according to the first aspect, the water flow main pipe control mechanism is configured such that the inlet header or the outlet header is a vertical pipe body, and the plurality of water flow main pipes are Openings on the inner wall of the inlet header or outlet header are arranged in the vertical direction, and a piston for allowing or preventing the heat medium from entering is provided on the inner wall of the pipe body. The piston moves up and down by a control device that can move up and down. It is characterized by doing.

According to a third aspect of the present invention, in the heat exchanger for an air conditioner according to the second aspect of the present invention, a female screw is provided at a predetermined position of the piston and corresponds to the female screw provided in the vertical direction in the pipe. A male screw shaft is provided, and when the male screw rotates, the piston moves up and down in the pipe.
According to a fourth aspect of the present invention, in the heat exchanger for an air conditioner according to the third aspect, the female screw is provided at the center of the piston, and a through hole for preventing the rotation of the piston on the plane of the piston is provided. A shaft penetrating the hole is fixed in the vertical direction in the pipe, and the piston moves up and down in the pipe.
According to a fifth aspect of the present invention, in the heat exchanger for an air conditioner according to the third aspect, the female screw is provided at an eccentric position away from the center of the piston so that the piston prevents rotation, The piston moves up and down in the pipe.

The invention according to claim 6 is the heat exchanger of the air conditioner according to claim 1, wherein the water flow main pipe control mechanism arranges a control valve between the inlet header or the outlet header and the plurality of water flow main pipes. Then, the water main pipe through which the water flows is selected and controlled.
The invention according to claim 7 is the heat exchanger of the air conditioner according to claim 1, wherein the water flow main pipe control mechanism selects and controls the water flow main pipe that allows water to flow through the inlet header or the outlet header using a rotary shutter. It is characterized by doing.

The heat exchanger for an air conditioner of the present invention has the following advantages.
(1) In an air conditioner that controls the coil outlet water temperature to be a predetermined temperature, no bypass path or bypass damper is required, and the size of the air conditioner can be reduced.
(2) Compared to the conventional bypass damper system, both the passing wind speed and the pipe water speed are used in the optimal range, and can be operated with high coil efficiency.
(3) The water speed in the pipe is easily maintained even at a low load, and a coil corrosion prevention effect due to adhesion of impurities in the coil water can be expected.
(4) When the inlet humidity is high, the amount of dehumidification is easily secured even at low loads. Furthermore, in-machine condensation is unlikely to occur compared to the bypass damper system.
(5) Even when the water flow stage number control mechanism itself is not used as a system for controlling the coil outlet water temperature to be a predetermined temperature, it can have a water amount control function instead of the electric two-way valve.
In particular, according to the heat exchanger of the air conditioner of claims 2 to 5, since the piston mechanism is used as the water flow main pipe control mechanism, it is possible to reliably control the flow or blocking of the water flow main pipe. Further, according to the heat exchanger of the air conditioner of claims 6 to 7, since the control valve or the rotary shutter is used for each water main pipe as the water main pipe control mechanism, the water main pipe to be bypassed is arbitrarily set. Can be set to eliminate air temperature spots.

The schematic of the whole heat exchanger of the air conditioner of Example 1 of the present invention, FIG. 3 is a perspective view of a lower portion of the inlet header of FIG. Sectional view of the top of the inlet header of FIG. The top view from the upper part of the piston of the water flow main pipe control mechanism of Example 1 of FIG. The block diagram at the time of using the heat exchanger of Example 1 for an air conditioner, The top view from the upper part of the piston of the water flow main pipe control mechanism of Example 2, Schematic of the whole water flow main pipe control mechanism using the electromagnetic control valve of Example 3, The fragmentary perspective view of the water flow main pipe control mechanism using the rotary shutter of Example 4, It is a block diagram at the time of using the heat exchanger of Example 5 for an air conditioner.

1 ... Heat exchanger 11 ... Outlet water temperature sensor (T1),
12. ・ Electric two-way valve (MV), 13. ・ Temperature sensor (T2),
14. Room temperature sensor (T3), 15. Inlet water temperature sensor (T0),
16. ・ Outlet water temperature sensor (T4)
2 .. Inlet header, 21 .. Connection part 211 .. Opening, 22 .. Lower end side,
23. Entrance part,
24..Inner wall, 25..Inside pipe, 251..Upper end, 252 ... Lower end,
26 .. discharge side piping,
3 .. Exit header, 31 .. Connection part, 311 .. Opening, 33 .. Exit part,
351 .. upper end, 352 .. lower end,
4 ··· Water flow main pipe, 41 ··· Opening on the inlet side, 42 ··· Radiating fins,
43 .. Exit side opening,
5 .. Water flow main pipe control mechanism 51. Piston 511.
52 .. O-ring, 53 .. Female thread member, 531 .. Fixing bolt,
54 .. Screw shaft, 55 .. Through hole, 56 .. Fixed shaft,
57 .... Motor, 571 ... Transmission mechanism, 59 ... Piston 6 ... Air conditioner, 61 ... Filter, 62 ... Fan,
63 .. Variable air volume control device (VAV),
7 .. Living room 81 .. Electromagnetic control valve 82.. Rotary shutter 821.
822 ... rotating shaft, 823 ... hollow inner cylinder

An embodiment of a heat exchanger for an air conditioner according to the present invention will be described with reference to the drawings.

An overall outline of the heat exchanger 1 of the present invention will be described with reference to FIG. 1. The heat exchanger 1 (coil) includes a tubular inlet header 2 extending in the vertical direction and a tubular outlet header 3 extending in the vertical direction as well. And a plurality of water flow main pipes 4 passing through a heat medium and exchanging heat are spanned between the corresponding inlet header 2 and outlet header 3 in the vertical direction.
The plurality of water flow main pipes 4 for heat exchange are connected via a connection portion 21 of the inlet header 2 and a connection portion 31 of the outlet header 3, and the outlet header 3 is sealed by a lower end portion 352 with an upper end portion 351. In the vicinity of the lower end, an outlet 33 is provided, and the water flow main pipe 4 itself is provided with heat radiation fins 42 in order to improve heat exchange efficiency.
Here, the water main pipe control mechanism 5 which is one of the features of the present invention will be described with reference to FIGS. 2, 3, and 4. The water main pipe control mechanism 5 is configured to pass the heat medium. The water main pipe 4 and the water main pipe 4 that blocks the heat medium are selected, and the number of water main pipes 4 is controlled.

In FIG. 2, the lower end side 22 of the inlet header 2 is provided with an inlet portion 23 to which cold water or hot water as a heat medium is supplied, and the inlet side openings 41 of the plurality of water flow main pipes 4 are the inner walls 24 of the inlet header 2. The piston 51 is arranged on the inner wall 24 of the inlet header 2 and moves up and down in a liquid-tight manner. The piston 51 moves up and down to allow or prevent the heat medium from entering, but in FIG. 2, the lower three water flow main pipes 4 have an inlet side opening 41 opened to the heat medium. The upper side is in a state where the entrance of the heat medium is blocked.
As shown in FIGS. 3 and 4, the piston 51 is fitted with a rubber O-ring 52 on the outer side to be kept fluid-tight, and a female screw member 53 provided with a female screw penetrating the central portion of the piston 51 is provided. A male screw shaft 54 that is fixed by a fixing bolt 531 and that corresponds to the female screw member 53 provided in the vertical direction of the pipe 25 of the inlet header 2 is provided, and a through-hole for preventing rotation of the piston in the flat portion 511 of the piston 51. 55, and a fixed shaft 56 penetrating the through hole 55 is fixed to the upper end 251 and the lower end 252 of the pipe 25.
Accordingly, since the piston 51 does not rotate when the screw shaft 54 of the male screw rotates, the female screw member 53 and the piston 51 move up and down in the pipe 25. The rotation of the screw shaft 54 is driven by a controlled motor 57 on the upper surface of the upper end 251 of the inlet header 2.

Here, the use state of the heat exchanger 1 of the said Example 1 is demonstrated with the air conditioner 6 along FIG.
In the air conditioner 6, the air that has taken in the outside air OA and the return air RA and has passed through the filter 61 is introduced into the heat exchanger 1 of the first embodiment. The air conditioned by the heat exchanger 1 is sent to a variable air volume control device (VAV) 63 by a fan 62. The variable air volume control device (VAV) 63 controls the air volume by a room temperature sensor (T3) 14 in the living room 7. The room temperature is appropriate, and this air is blown into the living room 7 to supply air SA.
Here, in the heat exchanger 1, an outlet water temperature sensor (T 1) 11 of the heat exchanger (coil) 1 is arranged in the discharge side pipe 26, and an electric two-way valve is detected by a detection value of the outlet water temperature sensor (T 1) 11. 12 is used to control the amount of water input to the heat exchanger 1, and a temperature sensor (T 2) 13 is also arranged downstream of the heat exchanger 1, and the motor 57 is detected by the detected value of the temperature sensor (T 2) 13. Control the amount of rotation.

Since it is such a structure, (A) By controlling the water flow stage number control mechanism 5 of the inlet header 2, the water flow main pipe 4 in which the heat medium is blocked is ventilated by the heat exchanger 1 and has a bypass function. Have.
Therefore, in FIG. 1, the gray area where the cooling / heating water as the heating medium is introduced into the water flow main pipe 4 is the cooling / heating area, and the colorless area where the cooling / heating water is blocked in the water flow main pipe 4 is the bypass area.
Thus, the detection temperature of the outlet temperature sensor 13 can be adjusted to a predetermined temperature by increasing or decreasing the water flow main pipe that blocks the heat medium.
On the other hand, when the temperature difference between the (A) inlet water temperature sensor (T0) 15 and the outlet water temperature sensor (T1) 11 is large, the electric water flow rate is increased by opening the electric two-way valve (MV) 12, and the outlet water temperature sensor The temperature of 11 is lowered to the required temperature. On the other hand, when the temperature difference between the inlet water temperature sensor (T0) 15 and the outlet water temperature sensor (T1) 11 is small, the number of water main pipes 4 to be passed is reduced and the water flow rate per bottle remains as it is. Set to a predetermined temperature.
Thus, the water flow main pipe 4 in which the cooling / heating water as the heat medium is blocked has the same functions as the damper and the bypass in Patent Document 2 described above.

The bypass air volume of the coil is controlled by this water flow stage number control mechanism. When the controllable range is exceeded, for example, when the required water volume becomes excessive due to a thermal load exceeding the design condition, (B) preferentially The electric two-way valve (MV) 12 can be controlled so that the outlet water temperature becomes a predetermined temperature.
Normally, (B) is operated with priority, but (A) and (B) may be appropriately combined for operation.
However, in this embodiment, the embodiment in which the control mechanism is provided in the inlet header has been described. However, a water flow stage number control mechanism may be provided in the outlet header, and the main point is that the inlet header 2 and the outlet header 3 are hung. It is only necessary to be able to control the number of pipes through which water is passed in the plurality of water main pipes 4.
In addition, in FIG. 1, since the piston 51 and the upper end part 251 are closed, the water of the heating medium does not substantially enter the upper water flow main pipe 4 from the outlet header 3, and if necessary, A check valve or the like may be provided in the opening 311 of the outlet header 3.

According to the heat exchanger of the air conditioner of the present embodiment, (1) in the air conditioner that controls the coil outlet water temperature to be a predetermined temperature, no bypass path or bypass damper is required, and the size of the air conditioner is reduced. Can do. (2) Compared to the conventional bypass damper system, both the passing wind speed and the pipe water speed are used in the optimal range, and can be operated with high coil efficiency. (3) The water speed in the pipe is easily maintained even at a low load, and a coil corrosion prevention effect due to adhesion of impurities in the coil water can be expected. (4) When the inlet humidity is high, the amount of dehumidification is easily secured even at low loads. In addition, compared to the bypass damper system, it is possible to obtain the action and effect that condensation in the machine is less likely to occur.

In the configuration of the piston 51 of the water flow main pipe control mechanism 5 of the first embodiment, in order to prevent the piston 51 from rotating, a through hole 55 is provided in the flat portion 511 of the piston 51, and a fixed shaft 56 is provided in the through hole 55. However, as shown in FIG. 6, the female thread member 53 of the piston 59 of the second embodiment is not provided at the center of the flat portion 511 of the piston 51 but at an eccentric position away from the center. In other respects, the configuration is the same as that of the first embodiment.
With this configuration, even if the screw shaft 54 rotates, the piston 59 is prevented from rotating by the inner wall 24 of the inlet header 2, and as a result, the piston 59 moves up and down in the pipe 25. In this configuration, it is not necessary to provide the through hole 55 and the fixed shaft 56 in the first embodiment as compared with the first embodiment.

Further, as a structure for preventing the rotation of the piston 51 of the water flow main pipe control mechanism 5, in addition to the first and second embodiments, a convex portion is provided on the inner wall 25 of the inlet header 2 in the vertical direction, and May be provided with a notch, or conversely, the inner wall 25 may be provided with a notch in a concave portion in the vertical direction, and the piston 51 facing may be provided with a convex portion. Alternatively, a screw may be provided on the inner wall 25 of the inlet header 2, and a screw may be provided outside the partition plate that controls the number of stages, and the partition plate can be moved in the header along the screw portion.

As a structure equivalent to the water flow main pipe control mechanism 5 using the

pistons

51 and 59 of the first and second embodiments, a control valve such as an electromagnetic control valve 81 is installed in each inlet side opening 41 of the water flow main pipe 4. This may be a structure, which will be described as a third embodiment with reference to FIG.
In Example 3 of FIG. 7, the configuration other than the

pistons

51 and 59 of the water flow main pipe control mechanism 5 is the same and will not be described, but instead of the piston structure, the inlet side opening 41 and the inlet header 2 of each water flow main pipe 4. A control valve such as an electromagnetic control valve 81 is interposed between the connecting portion 21 and the opening 211, and the plurality of electromagnetic control valves 81 are opened and closed by a command from a central control panel (not shown).
In the water main pipe control mechanism 5 using the electromagnetic control valve 81, the water main pipe 4 that allows water to flow and the water main pipe 4 that does not pass water can be arbitrarily selected, and the bypass location can be arbitrarily set. Can eliminate temperature spots.
Of course, the electromagnetic control valve 81 is arranged such that a control valve such as the electromagnetic control valve 81 is interposed between the opening 211 of the inlet header 2 and the inlet side opening 41 of the water flow main pipe 4. Alternatively, a configuration corresponding to the connection portion 31 and the opening 311 of the outlet header 3 in FIG. 1 is provided, and a control valve such as an electromagnetic control valve 81 is interposed between the outlet side opening 43 of the water flow main pipe 4. Good.

Furthermore, it demonstrates along FIG. 8 of the inlet header 2 of the other Example 4 of the water flow main pipe control mechanism 5. FIG.
The configuration of the water flow main pipe control mechanism 5 of the fourth embodiment shown in FIG. 8 is the same as that of the

pistons

51 and 59 and the electromagnetic control valve 81, and therefore the description thereof is omitted. Instead, a cylindrical rotary shutter 82 is used. In this structure, the connection between the inlet side opening 41 of each water flow main pipe 4 and the opening 211 of the inlet header 2 is opened and closed.
As shown in FIG. 8, a rotary shutter 82 of a hollow inner cylinder 823 having a circular cross section that can be rotated by a rotation shaft 822 is disposed on the inner wall of the cylindrical inlet header 2, and this cylindrical rotary shutter 82 is illustrated in FIG. As shown by 8 (dotted line portion), the long holes 821 having different lengths in the rotation direction rotate while sliding so as to contact the opening 211 of the connection portion 21.
Therefore, if the degree of rotation of the rotary shaft 822 of the rotary shutter 82 is controlled, when the long hole 821 and the opening 211 match, it opens and the water passage main pipe 4 passes, and when it does not match, the water passage main pipe. Since No. 4 does not pass water, the same operation and effect as in Examples 1 to 3 can be obtained.
Moreover, since the bypass location of the water flow main pipe 4 can be arbitrarily set by arbitrarily designing the long hole 821, air temperature spots can be eliminated.
Of course, the rotary shutter 82 may be arranged on the outlet header 3 side.

The other use state of the heat exchanger 1 of the said Example 1 thru | or Example 3 demonstrates the air conditioner 6 with FIG.
6 differs from the configuration of FIG. 6 of the first embodiment in that an outlet water temperature sensor (T4) 16 of a heat exchanger (coil) is arranged from the outlet header 3 to the discharge side pipe 26, and the outlet water temperature sensor (T4) 16 The temperature is detected, and the rotation amount of the motor 57 is controlled via the speed change mechanism 571 so that the water temperature of the outlet water temperature sensor (T4) 16 becomes a predetermined temperature.
Since it is such a configuration, by controlling the water flow stage number control mechanism 5 of the inlet header 2, the water flow main pipe 4 in which the heat medium is blocked has a bypass function through the ventilation of the heat exchanger 1. The water flow stage number control mechanism (water flow stage number) of the coil header part is controlled so that the coil outlet water temperature (T4) 16 becomes a predetermined temperature.
However, in this configuration, the coil outlet air temperature is mixed with the bypass air volume corresponding to the number of passes in the stage number control, and does not become the predetermined blowing temperature at the expected temperature. It will be done in a separate system.
When the coil outlet water temperature of the first embodiment is controlled to be a predetermined temperature and is not in use, the water flow stage number control mechanism 5 itself can have a water amount control function instead of the electric two-way valve.

The present invention can also be applied to a refrigerator using a heat exchanger. Of course, the present invention is not limited to the above-described embodiments as long as the features of the present invention are not impaired.

Claims

In a heat exchanger that spans a plurality of water flow main pipes that exchange heat by passing a heat medium between an inlet header and an outlet header,
A water flow main pipe control mechanism is provided for selecting a water flow main pipe through which the heat medium passes and a water main pipe that blocks the heat medium.
A heat exchanger for an air conditioner, characterized in that the water main pipe through which water is passed is selected and controlled to a required air conditioning state by the water main pipe control mechanism.
In the water flow main pipe control mechanism, the inlet header or the outlet header is a vertical pipe body, and the plurality of water flow main pipes are arranged in the vertical direction in the inner wall of the inlet header or the outlet header. 2. The heat exchanger for an air conditioner according to claim 1, wherein a piston that allows or prevents entry of the heat medium is provided on the inner wall, and the piston moves up and down by a control device that moves up and down.
An internal thread that penetrates is provided at a predetermined position of the piston, and a shaft of an external thread corresponding to the internal thread that is provided in the vertical direction in the pipe is provided. The heat exchanger for an air conditioner according to claim 2, wherein the heat exchanger is moved up and down.
The female screw is provided in the center of the piston, and a through hole for preventing the rotation of the piston in the plane of the piston is provided, and a shaft passing through the through hole is fixed in the vertical direction in the pipe, and the piston is The heat exchanger for an air conditioner according to claim 3, wherein the heat exchanger moves up and down in the pipe.
The air conditioner according to claim 3, wherein the female screw is provided at an eccentric position away from the center of the piston, and the piston moves up and down in the pipe so that the piston is prevented from rotating. Heat exchanger.
The water flow main pipe control mechanism arranges a control valve between the inlet header or outlet header and the plurality of water flow main pipes, and selectively controls a water flow main pipe through which water flows. A heat exchanger for an air conditioner described in 1.
2. The heat exchanger for an air conditioner according to claim 1, wherein the water flow main pipe control mechanism selects and controls a water flow main pipe through which water is passed to the inlet header or the outlet header using a rotary shutter.