CN106440887A - Heat exchanger for food baking and heat exchange and heat dissipation integrated preheating baking equipment - Google Patents

Abstract

The invention discloses a heat exchanger for food baking. The heat exchanger for food baking includes a top plate, a bottom plate, a side plate and a heat exchange partition arranged between the top plate and the bottom plate. The heat exchange partition The plates are fixed on the side plates, and the space between the top plate and the bottom plate is divided into a plurality of medium layers by the heat exchange spacer, and the heat exchange spacer is made of metal foil or metal sheet. Also disclosed is an integrated preheating and baking equipment for heat exchange and heat dissipation, which includes a baking oven body, and a microporous air distributor is provided at the lower part of the inner space of the oven body, and the microporous air distributor is connected to the refrigerant outlet. The inlet of the heat medium communicates with the upper part of the inner space of the oven body through the guide pipe, the inlet of the refrigerant is provided with a blower, and the outlet of the heat medium is provided with an induced draft fan. The entire heat exchange system of the present invention does not occupy any extra space, and the shell structure is fully utilized to make it a chassis heating device for baking equipment, a thermal insulation device for the lower part of the baking equipment, and a preheater device for recovering heat energy by using waste gas.

Description

Heat exchanger for food baking and integrated preheating and baking equipment for heat exchange and heat dissipation

technical field

The invention relates to a food baking equipment, in particular to a heat exchanger for food baking and an integrated heat exchange and heat dissipation preheating baking equipment.

Background technique

At present, the existing food processing and baking equipment can use the heat generated by the burner to process food. In order to make full use of the combustion heat and reduce heat loss, it is necessary to add a heat exchanger as a fresh air preheater. The preheaters of temperature equipment are all external type. The exhaust gas produced by combustion preheats the blown fresh air, so that the heat in the exhaust gas is recovered to the fresh air for further use by the equipment. Except for the heat energy generated by the heat source inside this baking equipment, the rest of the structure is a heat dissipation structure, which cannot provide additional heat energy; the preheater is a traditional type heat exchanger, which is arranged separately from the baking equipment, occupying external space, and the heat loss of the pipeline is huge , low efficiency; the air input system is separated from the baking equipment, in addition to the problem of high temperature airtightness, it is inconsistent with the heat flow field in the original system, which can lead to insufficient combustion and waste energy.

Contents of the invention

In view of the above problems, the present invention researches and designs a heat exchanger for food baking and an integrated preheating and baking equipment for heat exchange and heat dissipation. The technical means adopted in the present invention are as follows:

A heat exchanger for food baking, comprising a top plate, a bottom plate, a side plate and a heat exchange partition arranged between the top plate and the bottom plate, the heat exchange partition is fixed on the side plate, and the heat exchange partition will The space between the top plate and the bottom plate is divided into multiple medium layers, wherein the heat medium layer and the refrigerant layer are arranged at intervals, the uppermost medium layer is the heat medium layer, and the lowermost medium layer is the refrigerant layer. The lowermost refrigerant layer is connected to the refrigerant inlet and the lowermost heat medium layer is connected to the heat medium outlet, the uppermost heat medium layer is provided with a heat medium inlet, and the uppermost refrigerant layer is provided with a refrigerant outlet. Thermal barriers are made of metal foil or sheet metal.

Further, the heat medium layer is provided with a partition bar I that divides the heat medium layer into strip-shaped rotary channels, and the refrigerant layer is provided with a partition bar II that divides the refrigerant layer into strip-shaped rotary channels.

Further, the separation strip I is arranged vertically, the separation strip II is arranged horizontally, the separation strip I and the separation strip II are groove-shaped aluminum alloy strips, and the grooved side of the groove-shaped aluminum alloy strip faces the side set up.

Further, the heat exchange separator is bonded to the side plate by high temperature glue.

A heat exchange and heat dissipation integrated preheating baking equipment, including a baking oven body, a burner is arranged in the baking oven body, and a food baking oven according to the present invention is arranged at the bottom of the baking oven body. The heat exchanger, the top plate of the heat exchanger for food baking faces the inner space of the oven body, and the lower part of the inner space of the oven body is provided with a microporous air distributor, and the microporous air distributor is connected to the inner space of the oven body. The outlet of the refrigerant is connected, the inlet of the heat medium communicates with the upper part of the inner space of the oven body through a guide tube, a blower is provided at the inlet of the refrigerant, and an induced draft fan is provided at the outlet of the heat medium.

Further, a microporous air aspirator is provided on the upper part of the inner space of the oven body, and the heat medium inlet is connected to the microporous aspirator through a guide pipe.

Further, the microporous air distributor is arranged on both sides above the heat exchanger for food baking.

Further, an insulation layer is provided above the oven body, and an insulation cover is provided outside the draft pipe.

Further, an insulation board is provided on the inner side wall of the oven body, and the insulation board includes a metal shell and perlite filled in the metal shell, and the material of the side of the metal shell facing the inside of the baking equipment is mirror stainless steel.

Further, the blower and the induced draft fan are respectively connected to the heat exchanger through the air duct, the air duct is provided with slots, the slots are inserted with damper inserts, and the damper inserts are provided with There are air openings, and the two ends of the air door insert are provided with fixing ears for fixing the air door insert on the air duct pipe.

Compared with the prior art, the heat exchanger for food baking and the integrated preheating and baking equipment for heat exchange and heat dissipation according to the present invention have the following advantages:

1. The heat exchanger plays the role of heat insulation for the entire oven body. The uppermost layer is the heat medium layer where the combustion exhaust gas first enters. While exchanging heat with the refrigerant layer, it dissipates heat to the oven body to form heat exchange. The preheater structure combined with heat dissipation makes full use of the heat of combustion exhaust gas;

2. The outermost layer of the heat exchanger is the refrigerant layer where low-temperature fresh air first enters, and the temperature is relatively low, so the outer layer of the heat exchanger emits very little heat into the air, reducing heat loss;

3. The entire heat exchange system does not occupy any extra space, and the shell structure is fully utilized to make it the chassis heating equipment of the baking equipment, the heat insulation equipment for the lower part of the baking equipment, and the preheater equipment that uses exhaust gas to recover heat energy;

4. It can increase the temperature of the chassis of the baking equipment by 150°C, greatly reducing the working pressure of the lower heat source equipment, increasing the intake temperature by nearly 200°C, making the preheating efficiency higher than other types of preheaters, and making the part of the chassis in contact with the outside world The outside temperature difference is lower than 10°C, which greatly reduces the heat loss of the system, and the heat exchange efficiency of the heat exchanger can reach more than 85%.

Description of drawings

Fig. 1 is a structural schematic diagram of a heat exchanger for food baking according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of the first medium layer (refrigerant layer) from the bottom in the embodiment of the present invention.

Fig. 3 is a schematic structural diagram of the second medium layer (heat medium layer) from the bottom in the embodiment of the present invention.

Fig. 4 is a schematic structural diagram of the third medium layer (refrigerant layer) from the bottom in the embodiment of the present invention.

Fig. 5 is a schematic structural view of the fourth medium layer (heat medium layer) from the bottom in the embodiment of the present invention.

Fig. 6 is a schematic structural diagram of the fifth medium layer (refrigerant layer) from the bottom in the embodiment of the present invention.

Fig. 7 is a schematic structural diagram of the sixth medium layer (heat medium layer) from the bottom in the embodiment of the present invention.

FIG. 8 is a top view of FIG. 1 .

Fig. 9 is a schematic perspective view of the three-dimensional structure of the heat exchange and heat dissipation integrated preheating and baking equipment according to the embodiment of the present invention (the two sides of the box shell in the direction of the line of sight are not shown).

Fig. 10 is a structural schematic diagram of another viewing angle of Fig. 9 (the two surface box shells in the line of sight entering direction are not shown).

Fig. 11 is a schematic perspective view of the three-dimensional structure of the heat exchange and heat dissipation integrated preheating and baking equipment according to the embodiment of the present invention (excluding the oven body).

Fig. 12 is a structural schematic diagram of the air duct pipe and the air door insert according to the embodiment of the present invention.

13a to 13c are structural schematic diagrams of air door inserts with different air passage openings.

detailed description

As shown in Figures 1 to 8, a heat exchanger 100 for food baking includes a top plate 101, a bottom plate 102, a side plate 103 and a heat exchange partition 104 arranged between the top plate 101 and the bottom plate 102, the heat exchanger The heat separator 104 is fixed on the side plate 103, and the space between the top plate 101 and the bottom plate 102 is divided into a plurality of medium layers by the heat exchange separator 104, and the number of layers of the medium layer can be set as required. In this embodiment, The sixth layer is taken as an example for illustration. Wherein the heating medium layer 105 and the cooling medium layer 106 are arranged at intervals. In this embodiment, there are three layers of heating medium layers 105 and three layers of cooling medium layers 106. The tail ends of the uppermost heating medium layer 105 and the middle heating medium layer 105 are connected to each other. The head ends of the middle heat medium layer 105 and the lowermost heat medium layer 105 are connected to each other, and correspondingly, the head end and the tail end of the refrigerant layer 106 are connected in sequence to form an S-shaped integral channel. The uppermost medium layer is a heat medium layer 105, and the lowermost medium layer is a refrigerant layer 106. The bottom plate 102 is provided with a refrigerant inlet 107 communicated with the lowermost refrigerant layer 106 and a refrigerant inlet 107 communicated with the lowermost heat medium layer. Heating medium outlet 108, the uppermost heating medium layer 105 is provided with heating medium inlet 109, the uppermost cooling medium layer 106 is provided with refrigerant outlet 110, and the heat exchange partition 104 is made of metal foil, which can be aluminum foil or Copper foil, which can also be made of sheet metal, can be a thin sheet of aluminum, copper, or steel. The uppermost layer is the heat medium layer 105 where the combustion exhaust gas first enters. While exchanging heat with the refrigerant layer 106, it dissipates heat to the oven body to form a preheater structure combining heat exchange and heat dissipation to fully utilize the heat of the combustion exhaust gas; The lowest layer is the refrigerant layer 106 into which low-temperature fresh air first enters, and the temperature is relatively low, so the outer layer of the heat exchanger dissipates very little heat into the air, reducing heat loss.

The heat medium layer 105 is provided with a partition bar I111 that divides the heat medium layer 105 into strip-shaped rotary channels, and the refrigerant layer 106 is provided with a partition bar II112 that divides the refrigerant layer 106 into strip-shaped rotary channels. The edge of the layer 105 and the refrigerant layer 106 is provided with a diversion bar 113 , and the revolving flow channel refers to the flow channel for the medium to reciprocate step by step. The partition bar I111 is arranged vertically, so that the reciprocating flow of combustion exhaust gas in the flow channel is pushed from the middle to both sides or from both sides to the middle. The partition bar II112 is arranged horizontally, specifically, the partition bar II112 with runner openings at both ends and the partition bar II112 with runner openings in the middle are arranged at intervals, so that fresh air enters from the middle of one end, flows to both sides and then flows to the middle Flow, and so on, gradually move to the other end of the refrigerant layer 106, or fresh air first enters from both sides of one end, flows to the middle, then flows to both sides, and so on, gradually moves to the other end of the refrigerant layer 106. Since the heat exchange separator 104 is a metal foil with a small thickness, the separation strip I111 and the separation strip II112 divide the medium layer into a strip-shaped flow channel to make the heat exchange more sufficient. It plays the role of support, and is alternately arranged vertically and horizontally layer by layer, providing mesh support for the metal foil and prolonging the service life. In this embodiment, the separation bar I111, the separation bar II112 and the diversion bar 113 are made of groove-shaped aluminum alloy strips, and the openings are set towards the side, so as to provide effective support without reducing the heat transfer area and medium flow cross-sectional area.

The heat exchange separator 104 is bonded to the side plate 103 by high-temperature glue, and the high-temperature glue in this embodiment can withstand high temperatures above 350°C.

As shown in Figures 9 to 11, a heat exchange and heat dissipation integrated preheating baking equipment includes a baking oven body 200, and a burner is arranged inside the baking oven body 200, including an upper burner 201 and a lower burning burner. device (not shown in the figure), in this embodiment, the fuel pipe at the lower part of the oven body passes through the through hole 114 on the heat exchanger and is connected with the lower burner, and the number of burners can be set as required. There are usually two, three or four burners, and a corresponding number of through holes 114 can be set for different numbers of burners. In this embodiment, the case of two lower burners is used as an example for illustration. The bottom of the oven body 200 is provided with the heat exchanger 100 for food baking according to the present invention, and the specific supporting quantity can be set according to the needs. In this embodiment, each oven body 200 is equipped with two sets of food ovens. The heat exchanger 100 for baking, the top plate 101 of the heat exchanger 100 for food baking faces the inner space of the oven body 200, and dissipates heat to the oven body, forming a preheater structure combining heat exchange and heat dissipation, fully Using the heat of combustion exhaust gas, the lower part of the inner space of the oven body 200 is provided with a microporous air distributor 202, the microporous air distributor 202 is connected with the refrigerant outlet 110, and the heat medium inlet 109 is The flow pipe 203 communicates with the upper part of the inner space of the oven body 200 , the refrigerant inlet 107 is provided with a blower 204 , and the heat medium outlet 108 is provided with an induced draft fan 205 .

The upper part of the oven body 200 internal space is provided with a microporous air aspirator 206, and the heat medium inlet 109 is connected to the microporous aspirator 206 through a draft tube 203 (the microporous aspirator 206 and the microporous aspirator 206 The air distributor 202 may have the same structure).

The microporous air distributor 202 is arranged on both sides above the heat exchanger 100 for food baking.

A thermal insulation layer 207 is provided above the oven body 200 , and a thermal insulation cover is provided outside the draft tube 203 .

The inside wall of the oven body is provided with a heat preservation board 208, the heat preservation board 208 includes a metal shell and perlite filled in the metal shell, and the material of the metal shell facing the inside of the baking equipment is mirror stainless steel. The material of the metal shell in this embodiment is SUS304 mirror stainless steel. After the infrared radiation produced by the heat source is reflected by the mirror surface of the heat preservation board 208, a part is absorbed by the production material, and a part is reflected to other mirror surfaces. After multiple reflections, it is finally absorbed by the material, improving The effect of material absorption rate.

As shown in Fig. 12 and Fig. 13a to Fig. 13c, the blower 204 and the induced draft fan 205 are respectively connected to the heat exchanger through the air duct pipe 209, and the air duct pipe 209 is provided with a slit 210, and the slit 210 Inserted with a damper insert 211, the damper insert 211 is provided with an air passage opening 212, and the two ends of the damper insert 211 are provided with fixing ears for fixing the damper insert 211 on the air duct pipe 209 213. The width of the slit 210 is 0-0.05 mm larger than the thickness of the damper insert 211 , preferably 0-0.02 mm. In this embodiment, the thickness of the damper insert 211 is 1 mm, and the width of the slot 210 is 1-1.02 mm, so that the gap between the damper insert 211 and the slot 210 is extremely small, and the air volume is basically eliminated. leakage. The shape of the air door insert 211 is a shape formed by connecting two parallel line segments and two arcs, that is, a shape formed by cutting off a bow at both ends of a circle. The outer radians of the duct pipes are corresponding, and the diameters of the two arcs are slightly larger than the outer diameter of the air duct pipe 209. The air passage opening 212 is a circular hole arranged in the middle of the air door insert 211, and the air door insert 211 One or two fixing ears 213 are respectively provided at both ends. The fixing ear 213 is connected to both ends of the damper blade 211 through a connecting neck 214, and the width of the connecting neck 214 is smaller than that of the fixing ear 213, which is convenient for bending during fixing. When in use, select the damper insert 211 with a suitable area for the air passage opening 212, insert it into the slot 210 on the air duct pipe 209, adjust the position, bend the fixing ear 213, and realize the fixing of the damper insert 211. For a total of The air door insert 211 provided with four fixing ears 213 can bend the two fixing ears 213 on the same side in different directions, thereby enhancing the fixing effect. When it is necessary to adjust the passing air volume, the original air door insert 211 is removed, and a suitable air door insert 211 is selected to be inserted and fixed.

When in use, select a suitable damper insert 211 to insert into the slit 210, fix it, start the blower 204 and the induced draft fan 205, then the fresh air enters the lowermost refrigerant layer 106 shown in Figure 2 through the blower 204 and the refrigerant inlet 107, and Flow along the direction indicated by the pointed dotted line until it flows into the two corners above the figure, enter the second refrigerant layer shown in Figure 4 through the corner opening shown in Figure 4, and flow in the direction indicated by the pointed dotted line, until it flows into the middle part below the figure, and enters the upper refrigerant layer shown in figure 6 through the opening in the middle as shown in figure 6, and flows in the direction indicated by the sharp point of the dotted line until it flows to the two corners above the figure, And enter the oven body through the refrigerant outlet 110 shown in Figure 8 and the microporous air distributor 202 for combustion. Correspondingly, under the action of the induced draft fan, the high-temperature combustion exhaust gas enters the draft pipe 203 from the microporous air aspirator 206, and enters the uppermost heat medium layer 105 shown in FIG. Flow in the direction shown by the head, until it flows to the middle part of the upper part of the figure, and flows to the middle heat medium layer 105 shown in Figure 5 through the opening, and flows in the direction shown by the pointed head of the dotted line until it flows to the middle part shown in the figure. The two corners of the lower part flow to the lower heat medium layer 105 shown in FIG. 3 through openings, and flow along the direction indicated by the pointed dotted line until it flows to the heat medium outlet 108 and flows out through the induced draft fan. In the above process, the fresh air as the refrigerant exchanges heat with the combustion exhaust gas as the heat medium, so that the fresh air reaches a sufficient temperature for combustion, and at the same time reduces the temperature of the combustion exhaust gas to avoid excessive temperature of the exhaust gas and affect the operating environment .

This embodiment can increase the temperature of the chassis of the baking equipment by 150°C, greatly reduce the working pressure of the lower heat source equipment, increase the intake air temperature by nearly 200°C, make the preheating efficiency higher than other types of preheaters, and make the parts of the chassis in contact with the outside The temperature difference with the outside world is less than 10°C, which greatly reduces the heat loss of the system, and the heat exchange efficiency of the heat exchanger can reach more than 85%.

The above-mentioned embodiments are only descriptions of preferred implementations of the present invention, and are not intended to limit the scope of the present invention. All such modifications and improvements should fall within the scope of protection defined by the claims of the present invention.

Claims (10)

1. a kind of food-baking heat exchanger, including top board, base plate, side plate and the heat exchange that is arranged between top board and base plate every Plate, described heat exchange dividing plate is fixed on side plate, and the space between top board and base plate is divided into multiple media by described heat exchange dividing plate Layer, wherein heating agent layer and refrigerant layer interval setting it is characterised in that：The medium layer of the superiors is heating agent layer, undermost medium Layer is refrigerant layer, and described base plate is provided with the refrigerant import being connected with undermost refrigerant layer and is connected with undermost heating agent layer Heating agent outlet, be provided with Heating medium at the heating agent layer of the superiors, be provided with refrigerant exit at the refrigerant layer of the superiors, described heat exchange Dividing plate is made up of metal forming or sheet metal.

2. food-baking heat exchanger according to claim 1 it is characterised in that：Described heating agent layer is provided with and divides heating agent layer It is divided into the divider I that runner is turned round in bar shaped, described refrigerant layer is provided with and for refrigerant layer to be divided into the divider II that runner is turned round in bar shaped.

3. food-baking heat exchanger according to claim 2 it is characterised in that：Described divider I is longitudinally disposed, institute Stating divider II is horizontally set, and described divider I and divider II are flute profile aluminum alloy bar, the opening of described flute profile aluminum alloy bar Groove side is arranged towards side.

4. food-baking heat exchanger according to claim 1 it is characterised in that：It is gluing that described heat exchange dividing plate passes through high temperature It is connected on side plate.

5. a kind of heat exchange integrated heat dissipation formula prewarming baking equipment, including baking casing, is provided with burner in described baking box body, its It is characterised by：The bottom of described baking casing is provided with the food-baking heat exchanger described in any one in Claims 1-4, Towards the inner space of baking casing, the bottom of described baking housing interior volume sets the top board of described food-baking heat exchanger There is micropore ventilation terminal, described micropore ventilation terminal is connected with described refrigerant exit, described Heating medium passes through mozzle and baking box The top connection of the inner space of body, is provided with air blast at described refrigerant import, described heating agent exit is provided with air-introduced machine.

6. heat exchange integrated heat dissipation formula prewarming baking equipment according to claim 5 it is characterised in that：In described baking box body The top in portion space is provided with micropore air suction device, and described Heating medium is connected with described micropore air suction device by mozzle.

7. heat exchange integrated heat dissipation formula prewarming baking equipment according to claim 5 it is characterised in that：Described micropore ventilation terminal It is arranged on the both sides above food-baking heat exchanger.

8. heat exchange integrated heat dissipation formula prewarming baking equipment according to claim 5 it is characterised in that：On described baking casing Side is provided with heat-insulation layer, and the outside of described mozzle is provided with muff.

9. the heat exchange integrated heat dissipation formula prewarming baking equipment according to any one in right 5 to 8 it is characterised in that：Described The madial wall of baking casing is provided with warming plate, and described warming plate includes metal shell and the pearl being filled in metal shell Rock, one side material within towards baking device for the described metal shell is mirror face stainless steel.

10. heat exchange integrated heat dissipation formula prewarming baking equipment according to claim 9 it is characterised in that：Described air blast and Air-introduced machine is connected with heat exchanger by wind channel tube respectively, and described wind channel tube is provided with interpolation slit, is inserted with air door inserted sheet in described interpolation slit, Described air door inserted sheet was provided with wind perforate, and the two ends of described air door inserted sheet are provided with for air door inserted sheet is fixed on wind channel tube Fixing ear.