Energy-saving closed circulating heat pump drying equipment

Abstract

The invention discloses energy-saving closed circulation type heat pump drying equipment, and relates to the technical field of heat pump dryers, the energy-saving closed circulation type heat pump drying equipment comprises a heat pump drying mechanism, noise reduction mechanisms are symmetrically arranged on the outer side of the heat pump drying mechanism, the heat pump drying mechanism comprises a drying box, and a first air return opening is formed in the top of one side of the drying box; and a sensible heat exchanger is fixedly mounted at the top of the inner side of the drying box. According to the integral closed dryer, heat exchange with the outside is avoided through integral closed design, wet air obtained after materials are dried is dehumidified and heat is recycled through a closed structure and a heat pump system, the whole process is closed and circulated without any heat waste, and the integral closed dryer can still work normally at the environment temperature of-20 DEG C and is not affected by the environment temperature of the outside. The device is widely applied to cold drying areas in northern areas in winter, closed system drying heat recovery is adopted, and dried material cell sap can be recovered to serve as raw materials for preparing essential oil spices, such as roses and vanilla. And no pollutant is generated in the operation process.

Description

Technical Field

[0001] The invention relates to the technical field of heat pump drying machines, in particular to energy-saving closed-cycle heat pump drying equipment. Background Art

[0002] Heat pump dryer is a kind of equipment specially used for drying items. It uses heat pump technology to provide the required heat source and achieves constant temperature and humidity drying effect by controlling temperature and humidity. Its working principle is to transfer heat energy in the air to the dried items and discharge moisture through system circulation to achieve the purpose of drying. It is now widely used in agriculture, video, chemical industry and other industries. It can adjust temperature and humidity according to the needs of different items to ensure the quality and safety of items during drying and ensure the drying effect. It is suitable for the drying needs of various items.

[0003] In the prior art, for example, the “heat pump drying equipment” with patent application number: CN201811413006.6 includes a material chamber, a separation partition, a heat recovery device, a heat pump, an auxiliary electric heater and a fresh air duct. The air inlet of the material chamber is provided with a supply air duct, and the air outlet of the material chamber is provided with a return air duct. The separation partition is installed in the return air duct and divides the return air duct into a first air duct and a second air duct. The fresh air duct is connected to the second air duct through the heat recovery device, and the first air duct is connected to the heat pump through the heat recovery device. The auxiliary electric heater is installed on the heat pump, and the second air duct is connected to the supply air duct through the heat pump and the auxiliary electric heater. In the heat pump drying equipment provided by the present invention, the heat pump is the main heating element, the auxiliary electric heater assists in heating, the separation partition divides the return air duct into two channels, the first air duct and the second air duct, and the air in the material chamber is divided into two parts for separate processing, thereby improving the utilization rate of heat and the dehumidification amount in the material chamber.

[0004] Most of the existing heat pump dryers can recycle the waste heat discharged from the material drying room of the aircraft, which can improve the energy efficiency of the heat pump. However, when recycling the waste heat, different temperatures and humidity will have a great impact on the recycling effect, resulting in uneven waste heat utilization, which causes waste and reduces the waste heat recovery effect. At the same time, it is easily affected by environmental factors and has poor dehumidification performance. In view of the above problems, an energy-saving closed-cycle heat pump drying equipment is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide an energy-saving closed-cycle heat pump drying equipment to solve the problem that different temperatures and humidity during operation of the prior art proposed in the above background technology will have a great impact on the recovery effect, resulting in uneven utilization of waste heat and causing waste.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an energy-saving closed-cycle heat pump drying equipment, comprising a heat pump drying mechanism, a noise reduction mechanism is symmetrically arranged on the outer side of the heat pump drying mechanism, the heat pump drying mechanism comprises a drying box, a first return air outlet is arranged on the top of one side of the drying box, a sensible heat exchanger is fixedly installed on the top of the inner side of the drying box, an evaporator is fixedly installed on one side of the sensible heat exchanger, a condenser is arranged on the other side of the bottom of the sensible heat exchanger, an electric heater is arranged inside the drying box, the electric heater is arranged below the condenser, an independent dual heat pump system is arranged on the inner bottom of the drying box, a second return air outlet is arranged on the bottom of one side of the drying box, the second return air outlet is arranged below the first return air outlet, and the medium temperature and high humidity are used when in use. The air enters the heat pump drying mechanism and passes through the noise reduction mechanism to exchange heat with the low-temperature dry air. Then it enters the evaporator to provide heat source for the heat pump system. The low-temperature dry air is heated to medium-temperature dry air. After heating, it is assisted by the electric heater to become high-temperature and low-humidity air. After being discharged to the drying room by the fan, it absorbs boring heat and humidity in the drying room and becomes low-temperature and high-humidity air. Then it returns to the heat pump drying mechanism. After the above-mentioned cycle heating and dehumidification, it is dried again. The overall closed dryer has no heat exchange with the outside world. Through the closed structure, the heat pump system is used to dehumidify the wet air after drying the material, and the heat is reused. The whole process is closed and circulated without any heat waste. It can still work normally at an ambient temperature of -20℃ and is not affected by the external ambient temperature. It is widely used in the drying area in the north where it is very cold in winter. The closed system drying heat recovery can be used to recover the cell fluid of the dried material as a raw material for making essential oils and spices, such as roses and vanilla. No pollutants are generated during operation, and the environmental protection effect is significant.

[0007] Preferably, the noise reduction mechanism includes a soundproof cover, sound-absorbing cotton is arranged inside the soundproof cover, a plurality of suction holes are evenly distributed on the side matrix of the sound-absorbing cotton, a threaded sound-absorbing groove is opened on the inner side of the suction hole, the soundproof cover is arranged on both sides of the drying box, and sound-absorbing cotton is arranged inside, and the sound-absorbing cotton is made of glass fiber. When sound waves enter the fiber gaps of the sound-absorbing cotton, the fibers will vibrate, thereby converting the sound energy into heat energy and being consumed. Its fiber is very fine and has a large number of tiny pores, which can effectively capture and dissipate sound waves. The conical design of the attraction hole conforms to the acoustic black hole model, which can make the sound wave energy converge to the tip, so as to more effectively consume the low-frequency sound wave energy and achieve good sound absorption effect in the low-frequency range. The inner side of the attraction hole is provided with a threaded sound-absorbing groove. The threaded sound-absorbing groove adopts a spiral design to extend the propagation path of the sound wave in the sound-absorbing cotton, so that the sound wave is constantly reflected, refracted and scattered in the sound-absorbing cotton, and the contact opportunity and action time of the sound wave with the sound-absorbing cotton fiber and the hole wall are increased. The spiral design can guide the airflow and make the airflow flow more orderly in the sound-absorbing cotton. Especially for the circulating airflow in the drying equipment, this design can reduce the generation of airflow turbulence and eddy currents, and reduce the additional noise caused by the airflow impacting the sound-absorbing cotton. The spiral structure can increase the overall structural strength and stability of the sound-absorbing cotton, making it less likely to deform, damage or collapse during long-term use. Especially when subjected to external forces such as equipment vibration and airflow impact, this structure can better maintain the integrity and sound absorption performance of the sound-absorbing cotton and extend the service life of the sound-absorbing cotton.

[0008] Preferably, limiting members are symmetrically and movably installed on both sides of the inner wall of the sound insulation cover, one end of the limiting member is movably penetrated by a positioning block, one end of the positioning block is fixedly connected to a positioning seat, which is distributed on both sides of the interior of the sound insulation cover through limiting members, and is connected in a rotating manner. When the sound-absorbing cotton is embedded and installed inside the sound insulation cover, the limiting member is rotated and buckled on the outside of the sound-absorbing cotton, which facilitates the rapid limiting of the sound-absorbing cotton. The positioning block cooperates with the positioning seat to squeeze the surface of the sound-absorbing cotton, and at the same time, the spring member pushes the connecting plate to make the positioning block and the positioning seat move to one side of the sound-absorbing cotton and squeeze it, thereby ensuring that the sound-absorbing cotton is stably installed on the inner side of the sound insulation cover.

[0009] Preferably, a U-shaped frame is fixedly installed on the outer side of the limit member, and a pull rod is fixedly connected to one end of the positioning block. The pull rod movably runs through the inner side of the U-shaped frame. The U-shaped frame facilitates the installation support for the limit member, and cooperates with the pull rod to facilitate quick pulling out for disassembly.

[0010] Preferably, a connecting plate is symmetrically arranged on the outer side of the positioning block, and a guide rod is movably penetrated through the inner side of the connecting plate. The connecting plate facilitates the movable connection with the guide rod to achieve a guiding effect.

[0011] Preferably, a spring member is sleeved on the outside of the guide rod, one end of the spring member is connected to the connecting plate, and the other end of the spring member is connected to the inner wall of the U-shaped frame, and the spring member is conducive to providing elastic driving force.

[0012] Preferably, mounting strips are symmetrically fixedly installed at both ends of the sound insulation cover, and fixing holes are evenly penetrated through the sides of the mounting strips. The mounting strips cooperate with the fixing holes to improve the stability of the installation.

[0013] Preferably, a through hole is opened on the side of the limiting member, and the positioning block movably passes through the inner side of the through hole. The through hole facilitates the function of providing auxiliary limiting and provides movable space for the positioning block.

[0014] Preferably, a soundproofing pad is fixedly installed on the inner wall of the soundproof cover, and the soundproofing pad is arranged on the side of the suction hole. The soundproofing pad uses the pores in the fiber structure to absorb and dissipate sound waves. When the sound waves make the rock wool fibers vibrate, the sound energy is converted into heat energy and absorbed. The rock wool sound-absorbing cotton has a good absorption effect on medium and low frequency noise, and performs well in dealing with low-frequency vibration noise such as compressors. Its fiber structure can effectively absorb and reduce noise.

[0015] Preferably, a plurality of bottom supporting legs are fixedly mounted on the bottom of the drying box, a fan is arranged on the inner side of the drying box, and the fan is arranged on the side of the second return air outlet. The bottom supporting legs ensure the stable support of the drying box, and the fan helps to provide the function of ventilation circulation.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, the overall closed dryer is used, and the overall closed design has no heat exchange with the outside world. Through the closed structure, the heat pump system is used to dehumidify the wet air after drying the material, and the heat is reused. The whole process is closed and circulated without any heat waste. It can still work normally at an ambient temperature of -20°C and is not affected by the ambient temperature. It is widely used in the drying area in the north where it is very cold in winter. The closed system drying heat recovery can be used to recover the cell fluid of the dried material as a raw material for making essential oils and spices, such as roses, vanilla, etc. No pollutants are generated during operation, and the environmental protection effect is significant.

[0017] 2. In the present invention, the sound-absorbing cotton is made of glass fiber. When sound waves enter the fiber gaps of the sound-absorbing cotton, they will cause the fiber to vibrate, thereby converting the sound energy into heat energy and being consumed. The fiber is very fine and has a large number of tiny pores, which can effectively capture and dissipate sound waves. The conical design of the attraction hole conforms to the acoustic black hole model, which can make the sound wave energy converge to the tip, thereby more effectively consuming the low-frequency sound wave energy and achieving a good sound absorption effect in the low-frequency range. The inner side of the attraction hole is provided with a threaded sound-absorbing groove. The threaded sound-absorbing groove adopts a spiral design to extend the propagation path of the sound wave in the sound-absorbing cotton, so that the sound wave is constantly reflected, refracted and scattered in the sound-absorbing cotton, increasing the contact opportunity and action time of the sound wave with the sound-absorbing cotton fiber and the hole wall. The spiral design can guide the airflow, so that the airflow flows more orderly in the sound-absorbing cotton. Especially for the circulating airflow in drying equipment, this design can reduce the generation of airflow turbulence and eddies, and reduce the additional noise caused by the airflow impacting the sound-absorbing cotton. The spiral structure can increase the overall structural strength and stability of the sound-absorbing cotton, making it less likely to deform, damage or collapse during long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view structural schematic diagram of an energy-saving closed-cycle heat pump drying equipment of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of an energy-saving closed-cycle heat pump drying device of the present invention; Figure 3 It is a schematic structural diagram of another angle of an energy-saving closed-cycle heat pump drying device of the present invention; Figure 4 It is a side structural schematic diagram of an energy-saving closed-cycle heat pump drying device of the present invention; Figure 5 It is a structural schematic diagram of a noise reduction mechanism of an energy-saving closed-cycle heat pump drying equipment of the present invention; Figure 6 It is a structural schematic diagram of another angle of the noise reduction mechanism of an energy-saving closed-cycle heat pump drying equipment of the present invention; Figure 7 This is a schematic diagram of the structure of the installation parts of an energy-saving closed-cycle heat pump drying equipment of the present invention; Figure 8 The present invention is a schematic diagram of the decomposition structure of the noise reduction mechanism of an energy-saving closed-cycle heat pump drying equipment.

[0019] In the figure: 1. Heat pump drying mechanism; 101. First return air outlet; 102. Sensible heat exchanger; 103. Evaporator; 104. Condenser; 105. Electric heater; 106. Second return air outlet; 107. Independent dual heat pump system; 108. Bottom support leg; 109. Drying box; 110. Fan; 2. Noise reduction mechanism; 201. Soundproof cover; 202. Mounting strip; 203. Fixing hole; 204. Sound-absorbing cotton; 205. Suction hole; 206. Threaded sound-absorbing groove; 207. Limiting piece; 208. Positioning block; 209. Positioning seat; 210. Through hole; 211. U-shaped frame; 212. Pull rod; 213. Guide rod; 214. Spring member; 215. Connecting plate; 216. Sound-absorbing pad. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Example 1: Figure 1-Figure 4 As shown, the present invention provides a technical solution: an energy-saving closed-cycle heat pump drying device, comprising a heat pump drying mechanism 1, a noise reduction mechanism 2 is symmetrically arranged on the outside of the heat pump drying mechanism 1, the heat pump drying mechanism 1 comprises a drying box 109, a first return air port 101 is arranged on the top of one side of the drying box 109, a sensible heat exchanger 102 is fixedly installed on the top of the inner side of the drying box 109, an evaporator 103 is fixedly installed on one side of the sensible heat exchanger 102, a condenser 104 is arranged on the other side of the bottom of the sensible heat exchanger 102, and the drying box 109 is provided with a condenser 104. 9 is provided with an electric heater 105, which is arranged below the condenser 104, an independent dual heat pump system 107 is provided at the inner bottom of the drying box 109, a second return air outlet 106 is provided at the bottom of one side of the drying box 109, and the second return air outlet 106 is provided below the first return air outlet 101, a plurality of bottom support legs 108 are fixedly installed at the bottom of the drying box 109, a fan 110 is provided on the inner side of the drying box 109, and the fan 110 is provided on the side of the second return air outlet 106.

[0022] In this embodiment, when in use, the medium-temperature and high-humidity air enters the heat pump drying mechanism 1 through the noise reduction mechanism 2 and exchanges heat with the low-temperature dry air passing through 3, and then enters the evaporator to provide heat source for the heat pump system. The low-temperature dry air passing through 3 is heated to medium-temperature dry air, and then is auxiliary heated by the electric heater after being heated by 4. After becoming high-temperature and low-humidity air, it is discharged from 6 to the drying room by the fan, and after absorbing boring heat and humidity in the drying room, it becomes low-temperature and high-humidity air, and then returns to the heat pump drying mechanism 1. After the above-mentioned cycle heating and dehumidification, it is dried again and again. The overall closed dryer has an overall closed design without heat exchange with the outside world. Through the closed structure, the heat pump system is used to dehumidify the wet air after drying the material, and the heat is reused. The whole process is closed and circulated without any heat waste. It can still work normally at an ambient temperature of -20°C and is not affected by the ambient temperature of the outside world. It is widely used in the drying area in the north where winter is very cold. The closed system drying heat recovery can be used to recover the cell fluid of the dried material as a raw material for making essential oils and spices, such as roses, vanilla, etc. No pollutants are generated during operation, and the environmental protection effect is significant.

[0023] Example 2: Figure 5-Figure 8 As shown, the noise reduction mechanism 2 includes a soundproof cover 201, and a sound-absorbing cotton 204 is arranged inside the soundproof cover 201. A plurality of suction holes 205 are evenly distributed on the side matrix of the sound-absorbing cotton 204. A threaded sound-absorbing groove 206 is opened on the inner side of the suction hole 205. The inner wall of the soundproof cover 201 is symmetrically and movably installed with a limiting member 207 on both sides, and a positioning block 208 is movably penetrated at one end of the limiting member 207, and a positioning seat 209 is fixedly connected to one end of the positioning block 208. A U-shaped frame 211 is fixedly installed on the outer side of the limiting member 207, and a pull rod 212 is fixedly connected to one end of the positioning block 208. The pull rod 212 movably penetrates the inner side of the U-shaped frame 211. A connecting plate 215 is symmetrically arranged on the outside, a guide rod 213 is movably penetrated on the inside of the connecting plate 215, a spring member 214 is sleeved on the outside of the guide rod 213, one end of the spring member 214 is connected to the connecting plate 215, and the other end of the spring member 214 is connected to the inner wall of the U-shaped frame 211, mounting strips 202 are symmetrically fixedly installed on both ends of the sound insulation cover 201, fixing holes 203 are evenly penetrated on the side of the mounting strip 202, a through hole 210 is opened on the side of the limit member 207, and the positioning block 208 is movably penetrated on the inner side of the through hole 210, and a sound insulation pad 216 is fixedly installed on the inner wall of the sound insulation cover 201, and the sound insulation pad 216 is arranged on the side of the suction hole 205.

[0024] In this embodiment, the soundproof cover 201 is arranged on both sides of the drying box 109, and sound-absorbing cotton 204 is arranged inside. The sound-absorbing cotton 204 is made of glass fiber. When sound waves enter the fiber gap of the sound-absorbing cotton, it will cause the fiber to vibrate, so that the sound energy is converted into heat energy and consumed. Its fiber is very fine and has a large number of tiny pores. These pores can effectively capture and dissipate sound waves. The suction hole 205 adopts a conical design that conforms to the acoustic black hole model, which can make the sound wave energy converge to the tip, so as to more effectively consume the low-frequency sound wave energy and achieve a good sound absorption effect in the low-frequency range. The inner side of the suction hole 205 is provided with a threaded sound-absorbing groove 206. The threaded sound-absorbing groove 206 adopts a spiral design to extend the propagation path of the sound wave in the sound-absorbing cotton, so that the sound wave is constantly reflected, refracted and scattered in the sound-absorbing cotton, and the contact opportunity and action time of the sound wave with the sound-absorbing cotton fiber and the hole wall are increased. The spiral design can guide the airflow, so that the airflow flows more orderly in the sound-absorbing cotton. Especially for the circulating airflow in the drying equipment, this design can reduce the generation of airflow turbulence and eddy currents, and reduce the additional noise caused by the airflow impacting the sound-absorbing cotton. The spiral structure can increase the overall structural strength and stability of the sound-absorbing cotton, making it less likely to deform, damage or collapse during long-term use. Especially when subjected to external forces such as equipment vibration and airflow impact, this structure can better maintain the integrity and sound absorption performance of the sound-absorbing cotton and extend the service life of the sound-absorbing cotton. The sound-absorbing pad 216 uses the pores in the fiber structure to absorb and dissipate sound waves. When the sound waves make the rock wool fibers vibrate, the sound energy is converted into heat energy and absorbed. The rock wool sound-absorbing cotton has a good absorption effect on medium and low frequency noise, and performs well in dealing with low-frequency vibration noise such as compressors. Its fiber structure can effectively absorb and reduce noise. The limiting members 207 are distributed on both sides of the interior of the sound insulation cover 201, and a rotational connection method is adopted. When the sound-absorbing cotton 204 is embedded and installed in the interior of the sound insulation cover 201, the limiting members 207 are rotated and buckled on the outer side of the sound-absorbing cotton 204, which facilitates the rapid limitation of the sound-absorbing cotton 204. The positioning block 208 cooperates with the positioning seat 209 to squeeze the surface of the sound-absorbing cotton 204. At the same time, the spring member 214 pushes the connecting plate 215 to make the positioning block 208 and the positioning seat 209 move and squeeze toward one side of the sound-absorbing cotton 204, thereby ensuring that the sound-absorbing cotton 204 is stably installed on the inner side of the sound insulation cover 201. When disassembling, the positioning seat 209 can be separated from the sound-absorbing cotton 204 by pulling out the pull rod 212. At the same time, rotating the limiting member 207 facilitates the rapid completion of the disassembly function and is convenient for rapid replacement.

[0025] In the present invention, when the energy-saving closed-cycle heat pump drying equipment is in use, first, medium-temperature and high-humidity air enters from the heat pump drying mechanism 1 and passes through the noise reduction mechanism 2 to exchange heat with the low-temperature dry air passing through 3, and then enters the evaporator to provide a heat source for the heat pump system. The low-temperature dry air passing through 3 is heated to medium-temperature dry air, and after being heated by 4, it is auxiliary heated by the electric heater, and after becoming high-temperature and low-humidity air, it is discharged from 6 to the drying room by the fan, and after absorbing boring heat and humidity in the drying room, it becomes low-temperature and high-humidity air, and then returns to the heat pump drying mechanism 1. After the above-mentioned cycle heating and dehumidification, it is dried repeatedly. The sound-absorbing cotton 204 is made of glass fiber. When sound waves enter the fiber gaps of the sound-absorbing cotton, they will cause the fibers to vibrate, thereby converting the sound energy into heat energy and being consumed. The fiber is very fine and has a large number of tiny pores, which can effectively capture and dissipate sound waves. The conical design of the suction hole 205 conforms to the acoustic black hole model, which can make the sound wave energy converge to the tip, thereby more effectively consuming the low-frequency sound wave energy and achieving a good sound absorption effect in the low-frequency range. The inner side of the suction hole 205 is provided with a threaded sound-absorbing groove 206. The threaded sound-absorbing groove 206 adopts a spiral design to extend the propagation path of the sound wave in the sound-absorbing cotton, so that the sound wave is constantly reflected, refracted and scattered in the sound-absorbing cotton, and the contact opportunity and action time of the sound wave with the sound-absorbing cotton fiber and the hole wall are increased. The spiral design can guide the airflow, so that the airflow flows more orderly in the sound-absorbing cotton. Especially for the circulating airflow in the drying equipment, this design can reduce the generation of airflow turbulence and vortex, and reduce the additional noise generated by the airflow impacting the sound-absorbing cotton.

[0026] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An energy-saving closed-cycle heat pump drying device, comprising a heat pump drying mechanism (1), characterized in that: The heat pump drying mechanism (1) is symmetrically provided with a noise reduction mechanism (2) on the outside. The heat pump drying mechanism (1) comprises a drying box (109). A first return air port (101) is provided on the top of one side of the drying box (109). A sensible heat exchanger (102) is fixedly installed on the top of the inner side of the drying box (109). An evaporator (103) is fixedly installed on one side of the sensible heat exchanger (102). A condenser (104) is provided on the other side of the bottom of the sensible heat exchanger (102). An electric heater (105) is provided inside the drying box (109). The electric heater (105) is provided below the condenser (104). An independent dual heat pump system (107) is provided on the bottom of the inner side of the drying box (109). A second return air port (106) is provided on the bottom of one side of the drying box (109). The second return air port (106) is provided below the first return air port (101).

2. The energy-saving closed-cycle heat pump drying equipment according to claim 1 is characterized in that: The noise reduction mechanism (2) comprises a soundproof cover (201), wherein sound-absorbing cotton (204) is arranged inside the soundproof cover (201), a plurality of suction holes (205) are evenly distributed on a side matrix of the sound-absorbing cotton (204), and a threaded sound-absorbing groove (206) is provided inside the suction hole (205).

3. The energy-saving closed-cycle heat pump drying equipment according to claim 2 is characterized in that: Limiting members (207) are symmetrically and movably mounted on both sides of the inner wall of the soundproof cover (201); a positioning block (208) is movably penetrated through one end of the limiting member (207); and a positioning seat (209) is fixedly connected to one end of the positioning block (208).

4. The energy-saving closed-cycle heat pump drying equipment according to claim 3 is characterized in that: A U-shaped frame (211) is fixedly mounted on the outer side of the limiting member (207), and a pull rod (212) is fixedly connected to one end of the positioning block (208), and the pull rod (212) movably penetrates the inner side of the U-shaped frame (211).

5. The energy-saving closed-cycle heat pump drying equipment according to claim 4 is characterized in that: A connecting plate (215) is symmetrically arranged on the outer side of the positioning block (208), and a guide rod (213) movably penetrates the inner side of the connecting plate (215).

6. The energy-saving closed-cycle heat pump drying equipment according to claim 5 is characterized in that: A spring member (214) is sleeved on the outside of the guide rod (213), one end of the spring member (214) is connected to the connecting plate (215), and the other end of the spring member (214) is connected to the inner wall of the U-shaped frame (211).

7. The energy-saving closed-cycle heat pump drying equipment according to claim 2 is characterized in that: Mounting strips (202) are symmetrically fixedly mounted on both ends of the soundproof cover (201), and fixing holes (203) are evenly penetrated through the side surfaces of the mounting strips (202).

8. The energy-saving closed-cycle heat pump drying equipment according to claim 3 is characterized in that: A through hole (210) is provided on the side of the limiting member (207), and the positioning block (208) movably passes through the inner side of the through hole (210).

9. The energy-saving closed-cycle heat pump drying equipment according to claim 2, characterized in that: A soundproofing pad (216) is fixedly mounted on the inner wall of the soundproofing cover (201), and the soundproofing pad (216) is arranged on the side of the suction hole (205).

10. The energy-saving closed-cycle heat pump drying equipment according to claim 1, characterized in that: A plurality of bottom support legs (108) are fixedly mounted on the bottom of the drying box (109), a fan (110) is arranged on the inner side of the drying box (109), and the fan (110) is arranged on the side of the second air return port (106).

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