TWM554979U - Phase-change evaporator and phase-change heat dissipation device - Google Patents

Abstract

A phase change evaporator and a phase change heat dissipation device, wherein the phase change evaporator is provided with a reinforcing plate in the evaporator body, and the evaporation chamber having the heat transfer fins is partitioned into two spaces, the two spaces jointly communicate with the refrigerant outlet, the evaporator The side wall of the main body is provided with a refrigerant inlet having an opening area smaller than that of the refrigerant outlet, and the phase change heat dissipating device is connected to the refrigerant outlet and the refrigerant inlet of the phase change evaporator respectively to connect the refrigerant output tube and the refrigerant return tube to the condenser to form a refrigerant circulation loop. The refrigerant circulation circuit is filled with refrigerant. The structure in which the reinforcing plate is used to strengthen the phase change evaporator and the evaporation chamber is divided into two spaces, and when the phase change evaporator contacts the heat source to evaporate the refrigerant into a gaseous state, the internal gas pressure in the evaporation chamber can be increased, and the opening is matched. The difference in gas pressure between the refrigerant outlets of different sizes and the inlet of the refrigerant allows the gaseous refrigerant to accelerate toward the outlet of the refrigerant to improve the circulation performance of the refrigerant.

Description

Phase change evaporator and phase change heat sink

The present invention relates to a heat dissipating device, and more particularly to a heat dissipating device that utilizes a phase change of a refrigerant to generate endothermic and exothermic effects and a phase change evaporator thereof.

When existing electronic products are in operation, heat is usually generated in conjunction with them. In order to prevent electronic products from being abnormally operated or damaged due to excessive temperature, in general, heat dissipating devices are installed at the main heat sources of electronic products. The heat generated by the heat source is absorbed by the heat sink and quickly dissipated to maintain the electronic product at an appropriate operating temperature.

At present, the heat dissipating device commonly used for heat dissipation of electronic products is mainly composed of a phase change heat dissipating device, a conventional phase change heat dissipating device, which is mainly composed of a plurality of refrigerant tubes connected in series between an evaporator and a condenser. a closed refrigerant circulation loop, and the refrigerant is filled in the sealed refrigerant circulation loop, and the phase change heat dissipation device absorbs heat generated by the heat source by using the bottom plate of the evaporator, so that the heat absorption of the refrigerant in the evaporator is converted into a gaseous phase change, the gaseous refrigerant After the refrigerant conduit flows to the condenser to dissipate heat, the refrigerant is cooled and converted into a liquid state, and the liquid refrigerant is recirculated through another refrigerant conduit to the evaporator to re-absorb the heat, thereby providing a phase-change heat dissipating device with a circulating heat dissipation function for the heat source of the electronic product. Cooling function.

Although the front-removal heat-dissipating device can provide a heat-dissipating function to the heat source of the electronic product, the evaporator has a structural strength due to a hollow body having an evaporation chamber therein. Moreover, when the bottom plate of the evaporator contacts the heat source, the heat transfer in the evaporator is changed to the gaseous refrigerant in a single wide evaporation chamber, and it is difficult to reach a high pressure and pressure state, and the refrigerant tubes connected to the opposite sides of the evaporator are the same. Caliber The refrigerant conduits have the same fluid pressure as each other, and it is difficult for the gaseous refrigerant to flow toward the refrigerant outlet, resulting in poor circulating fluidity of the refrigerant. Although the existing phase change heat dissipating device further utilizes the position where the evaporator is connected to the two refrigerant conduits in a top-to-bottom configuration, in order to utilize the principle that the refrigerant phase changes with respect to the heat and the gaseous refrigerant rises, in order to guide the flow direction of the gaseous refrigerant, the existing evaporation chamber is provided. The structure is difficult to effectively increase the internal pressure, so there is still a problem that the circulating fluidity of the refrigerant is not good.

The main purpose of the present invention is to provide a phase change evaporator which solves the problems of poor strength of the evaporator body of the existing phase change evaporator and difficulty in providing good fluidity of the gaseous refrigerant.

In order to achieve the foregoing, the phase change evaporator of the present invention comprises: an evaporator body comprising a heat conducting bottom plate, a casing and a flow guiding end, the casing being fixed on the heat conducting base plate, An evaporation chamber is formed between the outer casing and the heat conducting bottom plate, the top of the outer casing has a through port communicating with the evaporation chamber, and a side wall of the outer casing is provided with a refrigerant inlet, and the flow guiding end is disposed at the top of the outer casing, the flow guiding end The portion of the flow guiding chamber communicates with the evaporation chamber, and the side wall of the flow guiding end portion is provided with a refrigerant outlet communicating with the flow guiding chamber, and the refrigerant outlet is located higher than the refrigerant inlet And the opening area of the refrigerant outlet is larger than the opening area of the refrigerant inlet; a reinforcing plate is installed in the evaporation chamber of the evaporator body, and the reinforcing plate is fixed to the heat conducting bottom plate and the top of the outer casing And dividing the evaporation chamber into two spaces and separating the portion of the evaporation chamber leading to the opening into two channels, wherein the reinforcing plate forms a plurality of perforations, so that the evaporation chamber is located on both sides of the reinforcing plate Space passing A plurality of perforations communicate with each other; and a plurality of heat conducting fins space, the system is provided in the evaporation chamber of the evaporator body and distributed on both sides of the reinforcing plate.

In order to achieve the foregoing object, the phase change heat dissipating device additionally proposed by the present invention comprises: a phase change evaporator as described above; a condenser comprising a first condensing base pipe, a second condensing base pipe, and a plurality of heat dissipation a conduit and a plurality of heat dissipating members, the first condensing base pipe and the second condensing base pipe are arranged upright and spaced apart, and the plurality of heat dissipating conduits are connected up and down between the first condensing base pipe and the second condensing base pipe. The plurality of heat dissipating members are arranged and thermally conductively contact the outer surface of the plurality of heat dissipating conduits; a refrigerant output pipe connecting the upper portion of the first condensing base pipe and the refrigerant outlet of the phase change evaporator; a refrigerant return pipe Connected between the lower portion of the second condensing base pipe and the phase change evaporator 旳 refrigerant inlet, the radial cross-sectional area of the refrigerant return pipe is smaller than the radial cross-sectional area of the refrigerant output pipe, the phase change evaporator, the refrigerant The output pipe, the condenser and the refrigerant return pipe form a closed refrigerant circulation circuit; and a refrigerant is charged in the refrigerant circulation circuit.

It is created by the former phase change evaporator and phase change heat sink. It mainly uses the heat transfer fins in the evaporation chamber of the phase change evaporator to cover the top surface of the heat conduction base plate to increase the heat conduction area and enhance the evaporation of the refrigerant. The phase change evaporator is provided with a reinforcing plate having a plurality of perforations in the evaporation chamber of the evaporator body to strengthen the structure of the phase change evaporator, and the reinforcing plate is divided into two spaces by using an evaporation chamber having heat-conducting fins The two spaces are connected to the refrigerant outlet together, whereby the phase change evaporator contacts the heat source to evaporate the heat of the refrigerant into a gaseous state, and the evaporation chamber structure divided into two spaces can increase the internal air pressure, and then mix the refrigerant outlets of different opening sizes. The difference in gas pressure generated from the inlet of the refrigerant allows the gaseous refrigerant to accelerate toward the refrigerant outlet to enhance the refrigerant circulation performance.

10‧‧‧ phase change evaporator

11‧‧‧Evaporator body

111‧‧‧thermal base plate

112‧‧‧Shell

1120‧‧‧ top board

1121‧‧‧Circle wall

113‧‧‧drainage end

1130‧‧ ‧ diversion chamber

114‧‧‧Evaporation room

114A, 114B‧‧‧ Space

115‧‧‧Refrigerant entrance

116‧‧‧ mouth

117‧‧‧Refrigerant exports

12‧‧‧ reinforcing plate

121‧‧‧Perforation

122‧‧‧ board edge

13, 13A‧‧‧ Thermal fins

20‧‧‧Condenser

21‧‧‧First condensing base pipe

22‧‧‧Second condensing base pipe

23‧‧‧heat pipe

24‧‧‧ Heat sink

30‧‧‧Refrigerant output tube

40‧‧‧Refrigerant return tube

50‧‧‧heat source

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of a preferred embodiment of the novel phase change evaporator.

Figure 2 is a side cross-sectional view showing a preferred embodiment of the phase change evaporator of Figure 1.

3 is a schematic side view showing another phase change of the phase change evaporator shown in FIG. 1.

4 is a side cross-sectional view of another preferred embodiment of the novel phase change evaporator.

Figure 5 is a top cross-sectional view of another preferred embodiment of the novel phase change evaporator.

Figure 6 is a perspective view of the novel phase change heat sink.

Fig. 7 is a view showing a state of use of the phase change evaporator shown in Fig. 4 and Figs. 1 to 3 applied to a heat source.

As shown in FIGS. 1 through 4, several preferred embodiments of the novel phase change evaporator are disclosed. The phase change evaporator 10 includes an evaporator body 11, a reinforcing plate 12, and a plurality of heat transfer fins 13.

As shown in FIG. 1 to FIG. 3, the evaporator body 11 includes a heat conducting bottom plate 111, a casing 112, and a flow guiding end portion 113. The heat conducting bottom plate 111 is a plate body made of a heat conductive material. A hollow body is fixed on the heat conducting bottom plate 111, and an evaporation chamber 114 is formed between the outer casing 112 and the heat conducting bottom plate 111. The outer casing 112 includes a top plate 1120 and a ring extending downward from the outer periphery of the top plate 1120. The bottom wall 1121 is fixed to the bottom edge of the circumferential wall 1121. The circumferential wall 1121 is provided with a refrigerant inlet 115 communicating with the evaporation chamber 114. The top plate 1120 of the outer casing 112 has a through hole 116. The flow guiding end 113 The flow guide end portion 113 has a flow guiding chamber 1130. The flow guiding chamber 1130 communicates with the evaporation chamber 114 through the through hole 116. The side wall of the flow guiding end portion 113 is disposed on the top plate 1120 of the outer casing 112. A refrigerant outlet 117 is provided to communicate with the flow guiding chamber 1130. The position of the refrigerant outlet 117 is higher than the position of the refrigerant inlet 115, and the opening area of the refrigerant outlet 117 is larger than the opening area of the refrigerant inlet 115.

As shown in FIG. 2, FIG. 3 and FIG. 4, the reinforcing plate 12 is installed in the evaporation chamber 114 of the evaporator body 11, and the reinforcing plate 12 is fixed between the heat conducting bottom plate 111 and the top plate 1120 of the outer casing 112. The reinforcement body 12 is reinforced by the reinforcing plate 12 to strengthen the structure of the evaporator body 11, and the reinforcing plate 12 partitions the evaporation chamber 114 of the evaporator body 11 into two mutually communicating spaces 114A, 114B. The top of the reinforcing plate 12 is divided into two channels by the portion of the evaporation chamber 114 that leads to the opening 116. The edge 122 of the reinforcing plate 12 can contact the circumferential wall 1121 of the outer casing 112, or as shown in FIG. Or a gap between the edge 122 of the reinforcing plate 12 and the circumferential wall 1121 of the outer casing 112. A plurality of through holes 121 are formed in the reinforcing plate 12, and the through holes communicate with the evaporation chamber 114 to be reinforced. Spaces 114A, 114B on either side of the board 12.

The refrigerant inlet 115 may be a combination of two holes (not shown) that are in one-to-one communication with the two spaces 114A, 114B of the evaporation chamber 114, respectively. As shown in FIG. 1 to FIG. 4, the refrigerant inlet 115 may also be a single hole that simultaneously communicates with the two spaces 114A, 114B of the evaporation chamber 114.

As shown in FIG. 2 to FIG. 4 , the plurality of heat conducting fins 13 are fixedly arranged in the evaporation chamber 114 of the evaporator body 11 and distributed in the space on both sides of the reinforcing plate 12 . The fins 13 are fixedly attached to the top surface of the heat conducting bottom plate 111 and extend upward. In the preferred embodiment, the top ends of the plurality of heat-dissipating fins 13 have a spacing from the bottom surface of the top plate 1120. As shown in FIG. 2 and FIG. 3, the heat-conducting fins 13 may be formed by bending a heat-conductive metal plate to form a wave-like member. As shown in FIG. 2 and FIG. 3, when the heat-dissipating fins 13 are wavy members, the peaks thereof are The direction in which the troughs are alternately arranged is parallel to the plate surface of the reinforcing plate 12, or, as shown in FIG. 4, the direction in which the peaks and troughs are alternately arranged is perpendicular to the plate surface of the reinforcing plate 12; alternatively, the heat-conducting fins may be flat The straight plate member, or as shown in FIG. 5, the heat transfer fin 13A is a straight strip or the like.

As shown in FIG. 1 to FIG. 4 and FIG. 6 , when the front phase change evaporator is applied to the phase change heat dissipation device, the phase change heat dissipation device includes a phase change evaporator 10 , a condenser 20 , and a refrigerant output. a tube 30 and a refrigerant return pipe 40, the condenser 20 includes a first condensing base pipe 21, a first a second condensing base pipe 22, a plurality of heat radiating ducts 23, and a plurality of heat radiating members 24, the first condensing base pipe 21 and the second condensing base pipe 22 are erected and spaced apart, and the plurality of heat radiating ducts 23 are vertically connected to the first Between the condensing base pipe 21 and the second condensing base pipe 22, the plurality of heat dissipating members 24 are arranged and thermally conductively contact the outer surface of the plurality of heat dissipating ducts 23. The refrigerant output pipe 30 is connected to the upper portion of the first condensing base pipe 21 and Between the refrigerant outlets 117 of the phase change evaporator 10, the refrigerant return pipe 40 is connected between the lower stage of the second condensing base pipe 22 and the phase change evaporator 10 and the refrigerant inlet 115, and the refrigerant output pipe 30 is radially cut. The area is larger than the radial cross-sectional area of the refrigerant return pipe 40, and the phase change evaporator 10, the refrigerant output pipe 30, the condenser 20 and the refrigerant return pipe 40 form a closed refrigerant circulation circuit, and the refrigerant circulation circuit is filled with the refrigerant. As a working fluid.

As shown in FIG. 2 to FIG. 3 and FIG. 5, when the refrigerant inlet 115 is a single hole, the single hole simultaneously communicates with the two spaces 114A and 114B of the evaporation chamber 114, and the refrigerant connected to the refrigerant inlet 115. The return line 40 is a single piece of tubing. When the refrigerant inlet is a combination of two holes (not shown), the two holes are respectively formed in one-to-one communication with the two spaces of the evaporation chamber, and the refrigerant return pipe is composed of two pipes (not shown) The two tubes are respectively connected to the two holes of the refrigerant inlet.

When the phase change heat dissipating device is used, the heat dissipation applied to the electronic product is taken as an example. As shown in FIG. 6 and FIG. 7 , the heat conduction source 50 of the phase change evaporator 10 is in contact with the heat source 50 of the electronic product, and the heat source is used. The heat generated by 50 is conducted to the heat-conducting fins 13 inside the evaporator body 11 through the heat-conducting bottom plate 111 to expand the heat-dissipating area, and the refrigerant in the spaces 114A, 114B on both sides of the evaporation chamber 114 of the evaporator body 11 is converted into a gaseous state by heat absorption. Further, through the through port 116 in the top plate 1120 of the evaporator body 11, the flow guiding end portion 113 enters the flow guiding end portion 113, and then flows through the refrigerant outlet 117 and the refrigerant output pipe 30 to the first condensing base pipe 21 of the condenser 20, and then is dispersed and passed through the condenser 20. The plurality of heat dissipation ducts 23 enter the second condensing base pipe 22, and heat is radiated to the heat dissipating members 24 contacting the plurality of heat dissipating ducts 23 to expand the heat dissipating surface for rapid heat dissipation and to cool the gaseous refrigerant passing through the plurality of heat dissipating ducts 23 And condensed into a liquid refrigerant, after which the liquid refrigerant passes through the second condensing base pipe 22, the refrigerant return pipe 40, and the refrigerant of the evaporator body 11 The port 115 is recirculated to the evaporation chamber 114 of the phase change evaporator 10 to re-absorb heat, thereby circulating, so that the phase change heat sink can achieve a high-efficiency heat dissipation effect.

In summary, the present invention uses a phase change evaporator and a condenser to form a closed refrigerant circulation loop by using a refrigerant output pipe and a refrigerant return pipe in series, the refrigerant circulation circuit is filled with a refrigerant, and the heat source is absorbed by the phase change evaporator. The generated heat converts the heat absorption of the refrigerant in the phase change evaporator into a gaseous state, and the gaseous refrigerant sequentially changes from the phase change evaporator to the condenser to dissipate heat, and the gaseous refrigerant cools down to return the liquid refrigerant to the phase change evaporator to achieve a predetermined heat dissipation function. Outside. The novel also utilizes a plurality of heat-conducting fins protruding from the top surface of the heat-conducting bottom plate in the evaporation chamber of the phase-change evaporator to increase the heat-conducting area and improve the evaporation performance of the refrigerant; the phase change evaporator is in the evaporation chamber of the evaporator body A reinforcing plate having a plurality of perforations is provided to strengthen the structure of the phase change evaporator, and the reinforcing plate is partitioned into two spaces by using an evaporation chamber having heat-conducting fins, the two spaces collectively communicating with the refrigerant outlet, thereby phase-evaporating When the heat exchanger is in contact with the heat source to evaporate the refrigerant into a gaseous state, the evaporation chamber structure divided into two spaces can increase the internal air pressure, and then the gas pressure difference between the refrigerant outlet and the refrigerant inlet with different opening sizes can make the gaseous refrigerant accelerate. The direction of the refrigerant outlet is passed to improve the circulation performance of the refrigerant.

10‧‧‧ phase change evaporator

11‧‧‧Evaporator body

111‧‧‧thermal base plate

112‧‧‧Shell

1120‧‧‧ top board

1121‧‧‧Circle wall

113‧‧‧drainage end

1130‧‧ ‧ diversion chamber

114‧‧‧Evaporation room

114A, 114B‧‧‧ Space

115‧‧‧Refrigerant entrance

116‧‧‧ mouth

117‧‧‧Refrigerate exports

12‧‧‧ reinforcing plate

121‧‧‧Perforation

13‧‧‧ Thermal fins

30‧‧‧Refrigerant output tube

40‧‧‧Refrigerant return tube

Claims (12)

A phase change evaporator comprising: an evaporator body comprising a heat conducting bottom plate, a casing and a flow guiding end, the casing being fixed on the heat conducting bottom plate, forming a gap between the outer casing and the heat conducting bottom plate An evaporation chamber, the top of the outer casing has a port communicating with the evaporation chamber, and a side wall of the outer casing is provided with a refrigerant inlet, the flow guiding end is disposed at the top of the outer casing, and the flow guiding end has a flow guiding chamber therein. The flow guiding chamber communicates with the evaporation chamber through the opening, the side wall of the flow guiding end is provided with a refrigerant outlet communicating with the flow guiding chamber, the position of the refrigerant outlet is higher than the position of the refrigerant inlet, and the opening of the refrigerant outlet The area is larger than the opening area of the refrigerant inlet; a reinforcing plate is installed in the evaporation chamber of the evaporator body, the reinforcing plate is fixed between the heat conducting bottom plate and the top of the outer casing, and the evaporation chamber is separated The two spaces and the portion of the evaporation chamber leading to the opening are divided into two channels, and a plurality of perforations are formed in the reinforcing plate, so that the space of the evaporation chamber on both sides of the reinforcing plate communicates with each other through the plurality of perforations ;as well as A thermally conductive fins disposed on the lines of the evaporation chamber of the evaporator body and is distributed in the space on both sides of the reinforcing plate. The phase change evaporator of claim 1, wherein the plurality of heat-dissipating fins are fixed to the top surface of the heat-conducting substrate, and a distance between the top ends of the plurality of heat-dissipating fins and the bottom surface of the top plate. The phase change evaporator of claim 2, wherein the heat transfer fins are bent by a heat conductive metal plate to form a wave-like member. The phase change evaporator of claim 3, wherein the wave-like peaks of the heat-conducting fins are parallel or perpendicular to the direction of the valleys of the reinforcing plate. The phase change evaporator of claim 2, wherein the outer casing comprises a top plate and a circumferential wall extending downward from an outer periphery of the top plate, the bottom edge of the circumferential wall being fixed to the heat conducting bottom plate, wherein the circumferential wall is provided The inlet of the refrigerant is provided in the top plate, and the flow guiding end is disposed on the top plate. The phase change evaporator of claim 5, wherein the edge of the plate on both sides of the reinforcing plate has a spacing from the circumferential wall of the outer casing. The phase change evaporator of claim 4, wherein the outer casing comprises a top plate and a circumferential wall extending downward from an outer periphery of the top plate, the bottom edge of the circumferential wall being fixed to the heat conducting bottom plate, wherein the circumferential wall is provided In the refrigerant inlet, the top plate is provided with the opening, and the flow guiding end is disposed on the top plate, and the edge of the plate on both sides of the reinforcing plate and the circumferential wall of the outer casing have a spacing. The phase change evaporator of any one of claims 1 to 7, wherein the refrigerant inlet has a single hole, and the single hole simultaneously communicates with the two spaces of the evaporation chamber. The phase change evaporator of any one of claims 1 to 7, wherein the refrigerant inlet is a combination of two holes that are in one-to-one communication with the two spaces of the evaporation chamber, respectively. A phase change heat sink comprising: the phase change evaporator of any one of claims 1 to 7; a condenser comprising a first condensing base pipe, a second condensing base pipe, and a plurality of heat dissipation a conduit and a plurality of heat dissipating members, the first condensing base pipe and the second condensing base pipe are arranged upright and spaced apart, and the plurality of heat dissipating conduits are connected up and down between the first condensing base pipe and the second condensing base pipe. The plurality of heat dissipating members are arranged and thermally in contact with the outer surface of the plurality of heat dissipating ducts; a refrigerant output tube connecting between the upper portion of the first condensing base pipe and the refrigerant outlet of the phase change evaporator; and a refrigerant recirculation a tube connected between the lower portion of the second condensing base pipe and the phase change evaporator 旳 refrigerant inlet, the radial cross-sectional area of the refrigerant return pipe being smaller than a radial cross-sectional area of the refrigerant output pipe, the phase change evaporator, the The refrigerant output pipe, the condenser and the refrigerant return pipe form a closed refrigerant circulation circuit, and the refrigerant circulation circuit is filled with a refrigerant. The phase change heat dissipating device of claim 10, wherein the refrigerant inlet has a single hole, the single hole simultaneously communicates with the two spaces of the evaporation chamber, and the refrigerant return pipe connected to the refrigerant inlet is a single pipe. The phase change heat dissipating device of claim 10, wherein the refrigerant inlet is a combination of two holes, the two holes respectively forming a one-to-one communication with the two spaces of the evaporation chamber, wherein the refrigerant return pipe is The two tubular members are respectively connected to the two holes of the refrigerant inlet.