JP6887074B2 - Heat exchanger - Google Patents

Description

The present invention relates to a heat exchanger, particularly a temperature sensor mounting configuration thereof.

Generally, heat exchangers such as air conditioners and refrigerators are provided with a temperature sensor that detects the temperature of a fluid such as a refrigerant flowing in the heat exchanger.

Conventionally, this temperature sensor is attached by inserting it between the fins of a heat exchanger (see, for example, Patent Document 1).

FIG. 9 shows a temperature sensor attachment portion of the heat exchanger described in Patent Document 1, and in this heat exchanger 100, the temperature sensor 102 is attached by inserting the temperature sensor 102 between the fins 101.

Japanese Unexamined Patent Publication No. 2005-214738

In the temperature sensor mounting configuration described in Patent Document 1, since the temperature sensor 102 is mounted near the flow path through which the refrigerant flows, there is an advantage that the temperature detection accuracy is high.

However, in the above temperature sensor mounting configuration, the distance between the fins 101 needs to be widened as much as the temperature sensor 102 can pierce, and the distance between the fins becomes large.

However, recent heat exchangers are under pressure to improve heat exchange efficiency, and it is required to narrow the fin spacing in order to improve heat exchange efficiency. However, since there is a limit to the reduction of the fin spacing in the temperature sensor mounting configuration of Patent Document 1, it is necessary to propose another sensor mounting configuration.

The present invention has been made in view of these points, and provides a heat exchanger in which a temperature sensor can be attached without limiting the fin spacing, and both heat exchange efficiency and temperature detection accuracy are improved. It is the purpose.

In order to achieve the above object, the present invention has a structure in which a plurality of plate-shaped heat transfer fins for heat exchange between a first fluid such as a refrigerant and a second fluid such as air are laminated, and the heat transfer flow through which the first fluid flows. A configuration including a path, a gap through which the second fluid passes, and a temperature sensor for detecting the temperature of the first fluid, and the temperature sensor is inserted and mounted so as to cross the heat transfer fins. There is.

In the present invention, the temperature sensor is mounted so as to cross the heat transfer fins, that is, the stacking directions of the temperature sensor and the heat transfer fins are substantially parallel to each other. As a result, since the fin spacing does not depend on the size of the temperature sensor, it can be mounted near the heat transfer flow path even when the fin spacing is narrow, and the fluid temperature detection accuracy can be improved. Further, since the fin spacing is not limited by the temperature sensor, it is possible to further narrow the heat transfer fin spacing and use a heat exchanger with high heat exchange efficiency while improving the fluid temperature detection accuracy.

According to the above configuration, the present invention can provide a high-performance heat exchanger in which both heat exchange efficiency and temperature detection accuracy are improved.

A perspective view showing the appearance of the heat transfer fin laminated heat exchanger according to the first embodiment of the present invention. An exploded perspective view showing the heat transfer fin laminated heat exchanger in a separated state. Perspective view showing the temperature sensor mounting part of the heat transfer fin laminated heat exchanger Perspective view showing the state of the heat transfer fin laminate before the temperature sensor is attached. Top view of the heat transfer fins constituting the heat transfer fin laminate of the heat transfer fin laminated heat exchanger Exploded view showing an enlarged part of the configuration of the heat transfer fin The perspective view which shows by cutting the heat transfer flow path group part of the heat transfer fin laminated body in the heat transfer fin laminated type heat exchanger. Perspective view showing by cutting the header flow path portion of the heat transfer fin laminate in the heat transfer fin laminate type heat exchanger. Sectional view of conventional heat exchanger

The first invention has a structure in which a plurality of plate-shaped heat transfer fins for heat exchange between a first fluid such as a refrigerant and a second fluid such as air are laminated, and the heat transfer flow path through which the first fluid flows and the first. The configuration is characterized in that it includes a gap through which the two fluids pass and a temperature sensor that detects the temperature of the first fluid, and the temperature sensor is inserted and mounted so as to cross the heat transfer fins.

As a result, the temperature sensor is mounted across the heat transfer fins, so it can be mounted near the heat transfer flow path even when the fin pitch spacing is narrow, improving the accuracy of fluid temperature detection and improving reliability. it can. Further, since the fin spacing is not limited by the temperature sensor, the heat transfer fin spacing can be further narrowed to provide a heat exchanger with high heat exchange efficiency while improving the fluid temperature detection accuracy.

In the second invention, in the first invention, the heat transfer flow path has a flow path region in which the first fluid flows in parallel and a header flow path region communicating with the flow path region, and the temperature. The configuration is characterized in that the sensor is provided in a portion other than the flow path region.

As a result, the temperature sensor can minimize the influence of the first fluid flowing in the flow path region, and can improve the detection accuracy of the first fluid temperature in the heat transfer flow path.

The third invention is characterized in that, in the first invention or the second invention, the heat transfer flow path is formed by providing a concave groove in the heat transfer fin.

As a result, the diameter of the heat transfer flow path can be significantly reduced as compared with the case where the heat transfer flow path is formed of a pipe, so that the heat exchange efficiency can be greatly improved in combination with the narrowing of the fin spacing. Further, since the heat exchanger can be appropriately controlled by increasing the temperature detection accuracy, it is possible to obtain a high-performance heat exchanger having high accuracy of heat exchange efficiency.

The fourth invention is characterized in that, in the first to third inventions, the heat transfer fin is provided with a hole, and the temperature sensor is inserted and mounted in the hole.

As a result, the hole for inserting the temperature sensor can be used as a positioning pin hole when the heat transfer fins are laminated, and the temperature sensor can be rationally mounted and the fins can be positioned to simplify the configuration.

In the fifth aspect of the invention, in the second to fourth inventions, the heat transfer flow paths are folded back so that the header flow paths on the inlet side and the outlet side are gathered on one end side of the heat transfer fins. The heat transfer fin was sandwiched between the end plates of the above, and one end of the header flow path region was fastened and fixed by a connecting means, and the temperature sensor was attached to the other end side opposite to the header flow path region. It is a configuration characterized by that.

As a result, even if the first fluid is concentrated on the header portion and a large pressure is applied, it is possible to prevent the header portion from being deformed by the fluid pressure due to fastening and fixing by the connecting means. At the same time, since there is almost no fluid pressure on the other end side, the number of fastening and fixing points by the connecting means can be reduced, and the mounting position of the temperature sensor is set near the heat transfer flow path without being restricted by the connecting means. can do. That is, it is possible to obtain a heat exchanger that has no pressure deformation and has high temperature detection accuracy of the first fluid.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the embodiment of the present invention, the heat transfer fin laminated heat exchanger in which the application of the present invention is most effective will be described as an example, but the present invention is not limited to this, and the following embodiments will be described. It includes a heat exchanger configuration equivalent to the technical idea. That is, for example, even in a fin-and-tube type heat exchanger, it is possible to realize a temperature sensor with higher accuracy than when a temperature sensor is provided in the tube.

(Embodiment 1)
FIG. 1 is a perspective view showing the appearance of the heat transfer fin laminated heat exchanger (hereinafter, simply referred to as a heat exchanger) of the present embodiment, and FIG. 2 shows a state in which the heat transfer fin laminated heat exchanger is separated. An exploded perspective view, FIG. 3 is a perspective view showing a temperature sensor mounting portion of the heat transfer fin laminated heat exchanger, FIG. 4 is a perspective view showing a state of the heat transfer fin laminated body before mounting the temperature sensor, and FIG. 5 is a heat transfer. A plan view of the heat transfer fins constituting the heat transfer fin laminate of the fin laminated heat exchanger, FIG. 6 is an enlarged exploded view showing a part of the heat transfer fin configuration, and FIG. 7 is a heat transfer fin laminated heat. A perspective view showing by cutting the heat transfer flow path group portion of the heat transfer fin laminate in the exchanger, FIG. 8 is a perspective view showing by cutting the header flow path portion of the heat transfer fin laminate in the heat transfer fin laminated heat exchanger. There is a figure.

As shown in FIGS. 1 to 8, the heat exchanger 1 of the present embodiment includes a heat transfer fin laminate 2 formed by laminating a plurality of heat transfer fins 2a having a rectangular plate shape, and an evaporator. It has a tube A4 that serves as an inlet when used as a condenser and a tube B5 which serves as an outlet when used as a condenser and vice versa.

Further, end plates 3a and 3b having substantially the same shape as the heat transfer fins 2a in a plan view are provided on both sides (upper side and lower side in FIG. 1) of the heat transfer fin laminate 2 in the stacking direction. The end plates 3a and 3b are made of a rigid plate material, and are formed by metal processing a metal material such as aluminum, an aluminum alloy, or stainless steel by grinding.

The end plates 3a and 3b and the plurality of heat transfer fins 2a are brazed and joined in a laminated state to be integrated.

Further, in the present embodiment, the end plates 3a and 3b on both sides of the heat transfer fin laminate 2 are connected and fixed at both ends in the longitudinal direction by connecting means 9 such as bolts and nuts or caulking pin shafts. That is, the end plates 3a and 3b on both sides of the heat transfer fin laminate 2 are mechanically connected and fixed by sandwiching the heat transfer fin laminate 2.

Further, as will be described later, the heat transfer fins 2a have a plurality of parallel heat transfer flow paths in which the refrigerant, which is the first fluid, flows, and the heat transfer flow paths are formed in a substantially U shape. The pipes A4 and B5 connected to the pipes A4 and B5 are collectively arranged on one end side of the end plate 3a on one side (left side in FIG. 1) of the heat transfer fin laminate 2.

More specifically, as shown in FIG. 5, the heat transfer fins 2a form a plurality of parallel heat transfer channels (hereinafter referred to as refrigerant channels) 11 and a header flow path A8 and a header flow path B10 connected thereto. A pair of plate-shaped members, a first plate-shaped member 6a and a second plate-shaped member 6b (see FIG. 6) are brazed and joined to face each other, and a plurality of refrigerant flow paths 11 are substantially U-shaped. The header flow path A8 and the header flow path B10, which are formed and are connected to the refrigerant flow path 11, are integrated on one end side.

As shown in FIGS. 7 and 8, the heat transfer fins 2a having the above configuration are laminated to form a heat transfer fin laminate 2 which is the main body of the heat exchanger, and are between the heat transfer fins 2a. A gap through which air, which is a second fluid, flows is formed by a plurality of protrusions 12 (see FIG. 5) appropriately provided between both ends of the long side of the heat transfer fin 2a and the refrigerant flow path 11.

The refrigerant flow path 11 is formed by the concave grooves of the first plate-shaped member 6a and the second plate-shaped member 6b, so that the diameter can be easily reduced.

Further, among the refrigerant flow paths 11, between the header flow path A side refrigerant flow path 11a connected to the header flow path A8 and the header flow path B side refrigerant flow path 11b connected to the header flow path B10, heat between the two is generated. A slit groove 15 is provided to prevent movement.

Further, in this example, as shown in FIG. 5, the header flow path B side refrigerant flow path 11b is divided into a flow path group located closer to the inside and a flow path group located closer to the outside of the heat transfer fin 2a by the passage portion 14. ing. The refrigerant flow path 11 has a larger number of flow paths forming the inner flow path group than the outer flow path group of the heat transfer fin 2a described above, and is a portion facing the passage portion 14 of the header flow path B10 as shown in FIG. Is provided with a non-perforated portion 16 having no refrigerant flow path. This is because when the heat exchanger is used as a condenser, the refrigerant flowing from the header flow path B10 on the inlet side to the refrigerant flow path 11b on the header flow path B side collides with the wall portion of the non-perforated portion 16 and is transmitted as described above. It is configured to flow evenly to each of the outer flow path and the inner flow path of the heat fin 2a. Therefore, the amount of refrigerant does not become non-uniform between the header flow paths B side refrigerant flow paths 11b, and a heat exchanger with good heat exchange efficiency can be realized.

In the heat exchanger 1 of the present embodiment configured as described above, the refrigerant flows in the refrigerant flow path 11 group inside the heat transfer fins 2a of the heat transfer fin laminate 2 in parallel in the longitudinal direction, makes a U-turn, and is folded back. It is discharged from the header flow path A8 or the header flow path B10 through the pipe A4 or the pipe B5. On the other hand, air, which is the second fluid, passes through the gap formed between the stacks of the heat transfer fins 2a constituting the heat transfer fin laminate 2. At this time, the heat of the air, which is the second fluid, is transferred to the refrigerant, which is the first fluid, via the heat transfer fins 2a, so that heat exchange between the first fluid and the second fluid is performed.

Here, as shown in FIGS. 3 and 4, this heat exchanger mainly composed of the heat transfer fin laminate 2 having the above configuration has the refrigerant flow path 11 group on one end side of the heat transfer fin laminate 2. A temperature sensor 17 that detects the temperature of the flowing refrigerant is attached.

The temperature sensor 17 is inserted and mounted so as to intersect the fin stacking direction of the heat transfer fin laminate 2. That is, as shown in FIG. 5, the heat transfer fins 2a of the heat transfer fin laminate 2 have holes at the ends opposite to the side where the header flow paths A8 and the header flow paths B10, which are the inlets and outlets, are provided. 18 is provided. This hole 18 is a location different from the flow path region P in which the refrigerant flow path 11 is provided, and is near the refrigerant flow path 11. In this example, as shown in FIG. 5, the corner where the refrigerant flow path 11 makes a U-turn. It is provided in the section. A similar hole 18 is also provided in the end plate 3b so as to face the hole 18, and the temperature sensor 17 is inserted through the hole 18 of the end plate 3b so as to intersect the stacking direction of the heat transfer fins 2a. It is attached. As a result, the temperature sensor 17 is embedded in the heat transfer fin laminate 2 so as to cross the heat transfer fins 2a.

Although the end plate 3b is provided with the hole 18, the hole 18 may be provided in either of the end plates 3.

Next, the action and effect of the heat exchanger configured as described above will be described. The action and effect will be described by taking the case where the heat exchanger is used as an evaporator as an example.

When the heat exchanger is used as an evaporator, the refrigerant flows in from the pipe A4 which is the inlet pipe, and the refrigerant flow path 11 inside the heat transfer fin 2a of the heat transfer fin laminate 2 passes through the header flow path A8. The group flows in parallel in the longitudinal direction, makes a U-turn, and is discharged from the pipe B5 that serves as the outlet pipe via the folded header flow path B10. On the other hand, air, which is the second fluid, passes through the gap formed between the stacks of the heat transfer fins 2a constituting the heat transfer fin laminate 2. At this time, the heat of the air is transferred to the refrigerant through the heat transfer fins 2a, the refrigerant is heated and the air is cooled, so that heat exchange between the refrigerant as the first fluid and the air as the second fluid is performed.

On the other hand, the temperature sensor 17 provided in the heat transfer fin laminate 2 detects the temperature of the refrigerant flowing in the refrigerant flow path 11 group, and the temperature data controls, for example, the frequency of an expansion valve (not shown) or a compressor. It is used as input data for

Here, the temperature sensor 17 is inserted so as to cross the stacking direction of the heat transfer fins 2a, and is attached so as to cross the heat transfer fins 2a. It is not necessary to do so, and it can be attached even if the distance between the fins of the heat transfer fins 2a is narrow.

Further, since the temperature sensor 17 is not pierced between the refrigerant flow paths 11 provided in the heat transfer fins 2a, it is not damaged and can be understood from the position of the hole 18 in FIG. Since the temperature sensor 17 can be attached near the refrigerant flow path 11, the accuracy of detecting the fluid temperature can be improved and the reliability can be improved.

Further, the heat exchanger is a refrigerant flow path 11 that connects a pair of header flow paths A8 and header flow path B10 having an inlet / outlet for introducing and discharging a fluid from the outside, and a header flow path A8 and a header flow path B10. The refrigerant flow path 11 is formed by providing a concave groove in the heat transfer fin 2a.

As a result, the diameter of the refrigerant flow path 11 can be significantly reduced as compared with the case where the refrigerant flow path 11 is formed of a pipe. Therefore, the heat exchange efficiency can be greatly improved in combination with the narrowing of the fin spacing, and a high-performance heat exchanger having high temperature detection accuracy and higher heat exchange efficiency can be obtained.

Further, since the temperature sensor 17 is provided in a portion other than the flow path region P having a plurality of refrigerant flow paths 11 through which the first fluid of the heat transfer fins 2a flows in parallel, the temperature of the second fluid flowing through the flow path region P is high. It is possible to suppress touching the sensor 17. Therefore, the influence of the second fluid can be minimized, and the accuracy of detecting the refrigerant temperature in the refrigerant flow path 11 can be improved.

Further, the hole 18 of the heat transfer fin 2a into which the temperature sensor 17 is inserted and mounted can be used as a positioning pin hole when the heat transfer fins are laminated. Therefore, it is not necessary to separately provide a positioning pin hole when laminating the heat transfer fins, and it is possible to prevent the fins from being misaligned while simplifying the configuration.

Further, a flow having a plurality of header flow paths 11 connecting an inlet and outlet header flow paths A8 and a header region H having a header flow path B10 and a header flow path A8 and a header flow path B10 in the header area H. This type of heat transfer fin laminated heat exchanger configured by laminating the heat transfer fins 2a having the path region P and the path region P exerts a large pressure from the refrigerant because the flow rate of the refrigerant in the header flow path A8 and the header flow path B10 is large. It becomes easy to receive and deform.

However, in the present embodiment, the refrigerant flow path 11 is U-turned in a substantially U-shape so that the header A8 and the header flow path B10 on the inlet side and the outlet side are gathered on one end side of the heat transfer fin 2a, and the header flow path A8 and the header flow path B10 are sandwiched between a pair of end plates 3a and 3b and fastened and fixed by the connecting means 9. Therefore, even if a large pressure of the first fluid is applied to the header flow path A8 and the header flow path B10, it is possible to prevent the header flow path A8 and the header flow path B10 from being deformed by fastening and fixing by the connecting means 9. it can. Since the portion that receives a large pressure of the refrigerant can be limited to only one end side of the heat transfer fin 2a, the fin fastening and fixing on the other end side can be done at one place or abolished. Therefore, a sufficient space can be secured for mounting the temperature sensor 17 at the end portion of the heat transfer fin 2a on the side opposite to the header region. Then, the temperature sensor 17 can be set at the optimum position of the fin end such as near the refrigerant flow path 11 without being disturbed by the connecting means 9, that is, without being restricted by the position of the connecting means 9, and the pressure deformation. It is possible to obtain a heat exchanger having no temperature detection accuracy of the first fluid and having high temperature detection accuracy. As a result, the heat exchange efficiency is improved by reducing the diameter of the refrigerant flow path 11 and narrowing the fin spacing, and there is no pressure deformation due to the refrigerant pressure, and the heat exchanger has high temperature detection accuracy of the first fluid. be able to.

The heat exchanger according to the present invention has been described above using the above-described embodiment, but the present invention is not limited thereto. That is, it should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive, and the scope of the present invention is indicated by the claims rather than the above description, and the patent. It is intended to include all changes within the meaning and scope of the claims.

For example, the heat exchanger is a fin-laminated heat exchanger in this embodiment, but any heat exchanger may be used. For example, the plate fin is configured by penetrating a pipe serving as a refrigerant flow path. It can be applied to various types of heat exchangers such as a fin tube type heat exchanger or a type of heat exchanger in which the header flow path tubes on the inlet side and the outlet side are connected by a tube tube serving as a refrigerant flow path.

Further, in the heat exchanger of the present embodiment, an example in which the refrigerant flow path 11 group makes a U-turn is illustrated, but this is a linear one without making a U-turn and heat is transferred between the header flow path A and the header flow path B. It may be provided separately at the left and right ends of the fin.

INDUSTRIAL APPLICABILITY According to the present invention, both the exchange efficiency and the temperature detection accuracy can be improved to obtain a high-performance heat exchanger. Therefore, it can be widely used in heat exchangers and various refrigerating devices used for home and commercial air conditioners, and has great industrial value.

1 Heat exchanger 2 Heat transfer fin laminate 2a Heat transfer fins 3, 3a, 3b End plate 4 Tube A
5 Tube B
6a 1st plate-shaped member 6b 2nd plate-shaped member 8 Header flow path A
9 Connecting means 10 Header flow path B
11 Refrigerant flow path (heat transfer flow path)
11a Header flow path A side refrigerant flow path 11b Header flow path B side refrigerant flow path 12 Protrusion 14 Passage part 15 Slit groove 16 No hole part 17 Temperature sensor 18 holes

Claims (4)

It has a structure in which a plurality of plate-shaped heat transfer fins for heat exchange between the first fluid and the second fluid are laminated, and the heat transfer fins are provided with a hole into which a positioning pin used for laminating the fins is inserted . A heat transfer flow path through which one fluid flows, a gap through which the second fluid passes, and a temperature sensor for detecting the temperature of the first fluid are provided, and the temperature is formed in the positioning hole so as to cross the heat transfer fin. A heat exchanger characterized in that a sensor is inserted and attached. The heat transfer flow path has a flow path region in which the first fluid flows in parallel and a header flow path region communicating with the flow path region, and the temperature sensor is provided in a portion other than the flow path region. The heat exchanger according to claim 1, wherein the heat exchanger is characterized in that. The heat exchanger according to claim 1 or 2, wherein the heat transfer flow path is formed by providing a concave groove in the heat transfer fin. The heat transfer flow path is folded back so that the header flow paths on the inlet side and the outlet side are gathered on one end side of the heat transfer fins, and the heat transfer fins are sandwiched between the pair of end plates to form the header. Any one of claims 2 to 3 , wherein one end of the flow path region is fastened and fixed by a connecting means, and the temperature sensor is attached to the other end side opposite to the header flow path region. The heat exchanger described in the section.

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