CN209944975U - Heat pump drying unit - Google Patents

Abstract

The utility model belongs to the technical field of heat pump units, in particular to a heat pump drying unit, which comprises a compressor, a condenser, an expansion valve, an evaporator, a first fan, an auxiliary heater and a drying box; the compressor, the condenser, the expansion valve and the evaporator are connected in sequence; an air inlet pipeline is arranged at an air inlet of the evaporator; the evaporator, the first fan, the condenser, the auxiliary heater and the drying box are communicated in sequence through a plurality of ventilation pipelines respectively; the drying box comprises a box body, a plurality of object carriers and a first partition plate; the upper end and the lower end of the box body are respectively provided with an air outlet and an air inlet, and the two ends of the first partition plate respectively extend to the air outlet and the air inlet and divide the inner cavity of the box body into a plurality of independent drying cavities; the plurality of carriers are arranged in the drying cavity along the vertical direction; an air outlet pipeline is arranged on the air outlet, and a circulating pipeline and a first valve are sequentially arranged on the air outlet pipeline; and a second valve and a second fan are arranged on the circulating pipeline. The heat pump drying unit has good drying uniformity.

Description

Heat pump drying unit

Technical Field

The utility model belongs to the technical field of heat pump set, especially, relate to a heat pump drying unit.

Background

Heat pump units generally consist of four parts: compressor, condenser, choke valve, evaporimeter. The working process is as follows: the low-temperature low-pressure liquid refrigerant first absorbs heat from a high-temperature heat source in an evaporator and is gasified into low-pressure vapor. The refrigerant gas is then compressed in the compressor to a high temperature and pressure vapor which is condensed in the condenser to a high pressure liquid by the low temperature heat source. Then the refrigerant is throttled into low-temperature low-pressure liquid refrigerant by a throttling element. Thus completing one cycle. Since the condenser of the heat pump system emits heat during operation, the temperature of the low-temperature air rises after passing through the condenser, thereby enabling drying of the articles. Therefore, the heat pump system is also often used as a drying system.

However, the drying box of the traditional heat pump drying unit mostly adopts a design of one inlet and one outlet, namely, an air inlet and an air outlet are arranged on the box body, but the drying section of the drying box is long, the flowing effect of hot air in the box body is poor, so that the drying of products is uneven, and the drying effect is poor.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a heat pump drying unit aims at solving the dry inhomogeneous technical problem of heat pump drying unit among the prior art.

In order to achieve the above object, an embodiment of the present invention provides a heat pump drying unit, which includes a compressor, a condenser, an expansion valve, an evaporator, a first fan, an auxiliary heater, and a drying box; the compressor, the condenser, the expansion valve and the evaporator are sequentially connected to form a refrigerant circulating system; an air inlet pipeline is arranged at an air inlet of the evaporator; the evaporator, the first fan, the condenser, the auxiliary heater and the drying box are communicated in sequence through a plurality of ventilation pipelines respectively; the drying box comprises a box body, a plurality of object carriers and a first partition plate; the upper end and the lower end of the box body are respectively provided with an air outlet and an air inlet, and the two ends of the first partition plate respectively extend to the air outlet and the air inlet and divide the inner cavity of the box body into a plurality of independent drying cavities; a plurality of said carriers arranged in a vertical orientation in said drying cavity; an air outlet pipeline is arranged on the air outlet, and a circulating pipeline and a first valve are sequentially arranged on the air outlet pipeline; and a second valve and a second fan are arranged on the circulating pipeline, and the other end of the circulating pipeline is connected with the air inlet end of the auxiliary heater.

Preferably, the auxiliary heater comprises a heater shell and a plurality of electric heating elements; a heating cavity is formed in the heater shell, and a plurality of second partition plates are alternately arranged on the top wall surface and the bottom wall surface of the heating cavity; the second partition plate divides the heating cavity into a plurality of mounting cavities; the electric heating element is arranged in the mounting cavity.

Preferably, the electric heating element is a heating wire or an electric heating tube.

Preferably, the number of air outlet with the air intake is at least two, and both are the terrace with edge structure.

Preferably, the object carrier is a plate-shaped structure, and a plurality of uniformly distributed ventilation holes are formed on the surface of the object carrier.

Preferably, the wall surface of the box body is also provided with a heat insulation layer.

Preferably, the heat-insulating layer is a polyurethane heat-insulating layer, and the thickness of the heat-insulating layer is 80-120 mm.

The embodiment of the utility model provides an above-mentioned one or more technical scheme in the heat pump drying unit have one of following technological effect at least: this heat pump drying unit's drying cabinet is provided with first baffle, the both ends of first baffle extend to respectively the air outlet with the air intake will a plurality of independent stoving cavitys are separated into to the inside cavity of box, have improved through such setting the space utilization of the inside cavity of box, the drying air current flows more evenly at the stoving cavity, has improved dry efficiency and homogeneity to make drying effect better.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

Fig. 1 is the embodiment of the utility model provides a heat pump drying unit's schematic structure diagram.

Fig. 2 is a schematic structural diagram of the drying box provided by the embodiment of the present invention.

Fig. 3 is a schematic structural diagram of an auxiliary heater according to an embodiment of the present invention.

Fig. 4 is a schematic structural view of a carrier according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary and intended to explain the embodiments of the present invention and are not to be construed as limiting the present invention.

In an embodiment of the present invention, as shown in fig. 1 to 2, a heat pump drying unit is provided, which includes a compressor 1, a condenser 2, an expansion valve 3, an evaporator 4, a first fan 5, an auxiliary heater 6 and a drying box 7. The compressor 1, the condenser 2, the expansion valve 3 and the evaporator 4 are connected in sequence to form a refrigerant circulation system. The working principle of the refrigerant circulating system is as follows: the low-temperature low-pressure liquid refrigerant first absorbs heat from a high-temperature heat source in the evaporator 4 and is vaporized into low-pressure vapor. The refrigerant gas is then compressed in the compressor 1 into a high-temperature and high-pressure vapor, which is cooled and condensed into a high-pressure liquid in the condenser 2 by a low-temperature heat source. And then the refrigerant is throttled by the expansion valve 3 into a low-temperature low-pressure liquid refrigerant and flows to the evaporator 4. Thus completing one cycle.

An air inlet of the evaporator 4 is provided with an air inlet pipeline 41 and a water outlet 42. The evaporator 4, the first fan 5, the condenser 2, the auxiliary heater 6 and the drying box 7 are respectively communicated in sequence through a plurality of ventilation pipelines 8a, 8b, 8c and 8 d. The drying cabinet 7 includes a cabinet 71, a plurality of racks 72, and a first partition 73. An air outlet 74 and an air inlet 75 are respectively arranged at the upper end and the lower end of the box body 71, and two ends of the first partition plate 73 respectively extend to the air outlet 74 and the air inlet 75 and divide the internal cavity of the box body into a plurality of independent drying cavities 711. The space utilization rate of the inner cavity of the box body 71 is improved through the arrangement, the first partition plate 73 plays a role in dispersing air flow and guiding air flow, the drying air flow flows more uniformly in the drying cavity 711, the drying efficiency and uniformity are improved, and the drying effect is better. In addition, the hot air is discharged from the air inlet 75 at the lower end of the case 71 and the air outlet 74 at the upper end of the case 71, and the flow speed of the air is increased and the drying efficiency is improved by using the principle that the hot air rises.

A plurality of said carriers 72 are arranged in said drying cavity 711 in a vertical direction. An air outlet pipeline 9 is arranged on the air outlet 75, and a circulating pipeline 91 and a first valve 92 are sequentially arranged on the air outlet pipeline 9. And a second valve 911 and a second fan 912 are arranged on the circulating pipeline 91, and the other end of the circulating pipeline is connected to the air inlet end of the auxiliary heater 6.

The heat pump drying unit has two working modes, when the drying object needs to be simply dried, the first valve 92 is closed, and the refrigerant circulating system does not work. Further, a third valve 81 is provided on the ventilation duct 8c connected between the condenser 2 and the auxiliary heater 6. The third valve 81 is closed. The second valve 911 is opened, the second fan 912 and the supplementary heater 6 are powered on, and air flows through the supplementary heater 6 into the drying box 7 to dry the articles. The gas continues to circulate through the air outlet duct 9 and the circulation duct 91.

When the drying object needs to be further dried, the first valve 92 and the third valve 81 are opened, the second valve 911 is closed, and the second fan 912 is not operated. The first fan 5 works to draw the external air into the evaporator 4 through the air inlet pipeline 41, the evaporator 4 absorbs heat, so that the temperature and the humidity of the air are reduced, and the condensed moisture is discharged from the water outlet 42. After that, the gas enters the condenser 2 through the ventilation duct 8b, and the condenser 2 releases heat to raise the gas temperature. The heated gas is further heated by the auxiliary heater 6 and then introduced into the drying oven 7 to dry the article. The dried waste gas is discharged through the air outlet pipeline 9.

In another embodiment of the present invention, as shown in fig. 3, the auxiliary heater 6 of the heat pump dryer set includes a heater housing 61 and a plurality of electric heating elements 62. A heating cavity 64 is formed inside the heater housing 61, and a plurality of second partition plates 65a and 65b are alternately arranged on the top wall surface and the bottom wall surface of the heating cavity 64. The second partitions 65a and 65b divide the heating cavity 64 into a plurality of mounting cavities 641. An electric heating element 62 is disposed in the mounting cavity 641. The working principle of the auxiliary heater 6 is as follows: when the air flow enters the heating cavity 64 from the air inlet end of the auxiliary heater 6 and flows from one mounting cavity 641 to the next mounting cavity, a better heating effect is achieved.

In another embodiment of the present invention, the electric heating element 62 of the heat pump dryer group is a heating wire or an electric heating tube. The heating effect of the electric heating wire or the electric heating tube is good, and the cost is low.

In another embodiment of the present invention, as shown in fig. 2, in order to further improve the uniformity of the air inlet and outlet flows, the number of the air outlets 74 and the air inlets 75 of the heat pump drying unit is at least two, and both are in a prism structure.

In another embodiment of the present invention, as shown in fig. 4, the carrier 72 of the heat pump drying unit has a plate-like structure, and a plurality of ventilation holes 721 are uniformly distributed on the surface of the carrier. The ventilation holes 721 have a ventilation effect, and the ventilation holes 721 uniformly distributed can disperse air flow more, so that the drying uniformity is further improved.

In another embodiment of the present invention, as shown in fig. 2, a heat insulating layer 711 is further disposed on a wall surface of the box 71 of the heat pump drying unit. The insulating layer 711 plays a role in insulating, and reduces the dissipation of energy inside the box body 71.

In another embodiment of the present invention, in order to achieve better heat preservation effect, the heat preservation layer 711 of the heat pump drying unit is a polyurethane heat preservation layer, and the thickness of the heat preservation layer is 80-120 mm.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (7)

1. A heat pump drying unit comprises a compressor, a condenser, an expansion valve, an evaporator, a first fan, an auxiliary heater and a drying box; the compressor, the condenser, the expansion valve and the evaporator are sequentially connected to form a refrigerant circulating system; the method is characterized in that: an air inlet pipeline is arranged at an air inlet of the evaporator; the evaporator, the first fan, the condenser, the auxiliary heater and the drying box are communicated in sequence through a plurality of ventilation pipelines respectively; the drying box comprises a box body, a plurality of object carriers and a first partition plate; the upper end and the lower end of the box body are respectively provided with an air outlet and an air inlet, and the two ends of the first partition plate respectively extend to the air outlet and the air inlet and divide the inner cavity of the box body into a plurality of independent drying cavities; a plurality of said carriers arranged in a vertical orientation in said drying cavity; an air outlet pipeline is arranged on the air outlet, and a circulating pipeline and a first valve are sequentially arranged on the air outlet pipeline; and a second valve and a second fan are arranged on the circulating pipeline, and the other end of the circulating pipeline is connected with the air inlet end of the auxiliary heater.

2. The heat pump dryer group of claim 1, wherein: the auxiliary heater comprises a heater shell and a plurality of electric heating elements; a heating cavity is formed in the heater shell, and a plurality of second partition plates are alternately arranged on the top wall surface and the bottom wall surface of the heating cavity; the second partition plate divides the heating cavity into a plurality of mounting cavities; the electric heating element is arranged in the mounting cavity.

3. The heat pump dryer group of claim 2, wherein: the electric heating element is an electric heating wire or an electric heating tube.

4. The heat pump dryer group of claim 1, wherein: the air outlet with the quantity of air intake is at least two, and both are the terrace with edge structure.

5. The heat pump dryer group of claim 4, wherein: the object carrier is of a plate-shaped structure, and a plurality of uniformly distributed ventilation holes are formed in the surface of the object carrier.

6. The heat pump dryer group according to any one of claims 1 to 5, wherein: and the wall surface of the box body is also provided with a heat insulation layer.

7. The heat pump dryer group of claim 6, wherein: the heat preservation is the polyurethane heat preservation, and its thickness is 80 ~ 120 mm.

Images