Vapor heat exchange heat pump system for commercial dishwashers

Abstract

The utility model relates to a steam heat exchange heat pump system for commercial dish washer belongs to heat pump system technical field, including compressor, evaporimeter, throttling element and condensing heat exchange subassembly, still include three -level condensing heat exchanger, back gas enthalpy heat exchanger, condensing evaporative heat exchanger and steam heat exchange system, the steam heat exchange system contains the drainage pipe of intercommunication dish washer steam export, air -supply fan, steam integrated cover, evaporimeter, exhaust fan, the input end connection of back gas enthalpy heat exchanger refrigerant export of third condensing heat exchanger, output end connects condensing evaporative heat exchanger, the utility model discloses, through multistage condensation, refrigerant flow direction and water flow direction form reverse heat exchange, steam integrated recovery, dynamic control environment air enters evaporimeter heat exchange capacity etc. Innovative design, realized dish washer steam waste heat's efficient utilization, can provide water temperature greater than 85 degrees high temperature hot water for dish washer, low temperature evaporimeter heat exchange absorption steam heat also reduces environmental temperature simultaneously, reduces energy consumption 35% or above, prolongs equipment life 30%, provides key technical support for green energy -conserving operation of commercial dish washer.

Description

Technical Field

[0001] This utility model relates to the field of heat pump system technology, and in particular to a steam heat exchange heat pump system for commercial dishwashers. Background Technology

[0002] During the operation of commercial dishwashers, the large amount of high-temperature steam generated during the washing stage is usually directly discharged into the environment through the exhaust system without effective recovery and utilization of the latent heat contained therein, resulting in energy waste and increased operating costs. Although traditional heat pump systems have a certain waste heat recovery capability, they generally suffer from problems such as low condensation efficiency, a single refrigerant circulation path, and insufficient contact between steam and evaporator, making it difficult to achieve cascade utilization of steam energy and a significant improvement in the overall system energy efficiency ratio (COP).

[0003] In addition, existing systems often use single-stage or two-stage condenser heat exchangers, and uneven distribution of refrigerant flow can easily lead to local overcooling or overheating, resulting in unstable equipment operation; insufficient control of compressor return gas temperature can easily exacerbate mechanical wear due to high-temperature suction; and failure to discharge or uneven mixing of condensed steam may cause condensation and corrosion on the evaporator surface, further shortening the service life of the equipment. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a steam heat exchange heat pump system for commercial dishwashers, aiming to solve the problems in the background art.

[0005] To achieve the above-mentioned utility model objectives, the first aspect of this utility model proposes a steam heat exchange heat pump system for commercial dishwashers, including a compressor, an evaporator, a throttling element, and a condensation heat exchange assembly;

[0006] It also includes a three-stage condensing heat exchanger, a return gas enthalpy-increasing heat exchanger, a condensing evaporator, and a steam heat exchange system;

[0007] The refrigerant channels of the three-stage condensing heat exchanger are connected in series through flow-limiting pipes, and its water channel and refrigerant channel are arranged in counter-current arrangement.

[0008] The steam heat exchange system includes a drain pipe connected to the steam outlet of the dishwasher, a blower, and a steam integrated cover covering the evaporator;

[0009] The input end of the return gas enthalpy-increasing heat exchanger is connected to the refrigerant outlet of the third condensing heat exchanger, and the output end is connected to the condensing evaporating heat exchanger.

[0010] The condenser-evaporator has three outputs: the first output is connected to the evaporator inlet via the first main throttle, the second output is connected to its own evaporation channel via the second throttle capillary tube, and the third output is directly connected to the compressor return gas end.

[0011] The evaporator outlet is sequentially connected to the refrigerant channel of the return gas enthalpy-increasing heat exchanger, the evaporation channel of the condenser-evaporator exchanger, and then connected to the compressor.

[0012] Optionally, the flow-limiting pipe includes a primary flow-limiting pipe, a secondary flow-limiting pipe, and a tertiary flow-limiting pipe, and the tertiary condensing heat exchanger includes a first condensing heat exchanger, a second condensing heat exchanger, and a third condensing heat exchanger connected in series through the primary flow-limiting pipe, the secondary flow-limiting pipe, and the tertiary flow-limiting pipe.

[0013] The diameter of the flow-limiting pipe decreases in stages and is installed at the refrigerant outlet end of the corresponding condensing heat exchanger.

[0014] Optionally, the return gas enthalpy-increasing heat exchanger is a plate heat exchanger, with its high-temperature side channel connected to the refrigerant outlet of the third condensing heat exchanger and its low-temperature side channel connected to the evaporator outlet and the compressor return gas end.

[0015] Optionally, the steam integrated hood is provided with an air inlet, which is equipped with an adjustable damper and is located on the airflow inlet side of the blower.

[0016] Optionally, the condenser-evaporator includes mutually isolated condensation channels and evaporation channels, wherein:

[0017] The condensation channel inlet is connected to the output end of the return gas enthalpy-increasing heat exchanger, and the outlet is split to the first main throttling device and the throttling main capillary tube and the second throttling capillary tube;

[0018] The evaporator channel inlet is connected to the second throttling capillary tube, and the outlet is connected to the compressor return gas end.

[0019] Optionally, the vapor recovery path is as follows: dishwasher → drain pipe → blower → vapor integrated hood → evaporator → exhaust fan.

[0020] Optionally, when the amount of steam recovered is insufficient to meet the heat exchange requirements of the evaporator, the ambient air is supplied via the following path: air supply port → evaporator → exhaust fan.

[0021] Optionally, an unloading valve is provided between the compressor discharge end and the first condensing heat exchanger.

[0022] The beneficial effects of this utility model are:

[0023] This utility model discloses a steam heat pump system for commercial dishwashers. Through a three-stage condenser heat exchanger design, combined with a counter-current arrangement of refrigerant and water channels, it maximizes the condensing temperature gradient and significantly improves condensing heat transfer efficiency. The stepped arrangement of the flow-limiting pipes, with progressively decreasing flow rates, optimizes refrigerant flow distribution, balances the heat load of each condenser stage, avoids high-pressure surges, and extends equipment lifespan. The return gas enthalpy-increasing heat exchanger adopts a plate heat exchanger structure, utilizing the excess heat of the third condenser heat exchanger to exchange heat with the evaporated return gas refrigerant, effectively improving system operating conditions and heating efficiency. The synergistic effect of the integrated steam hood and the blower serves to collect and guide steam flow and facilitate evaporator heat exchange. The adjustable damper design of the air inlet dynamically regulates the air intake volume, fully meeting the evaporator's heat exchange requirements.

[0024] The three output paths of the condenser-evaporator enable the graded utilization of condensation heat: the main throttling device supplies liquid to the evaporator, the throttling capillary tube supplies liquid to the evaporator channel, and the direct return to the compressor's return gas end, forming a multi-stage heat recovery closed loop and significantly improving the system's coefficient of performance (COP). The unloading valve further ensures the safety of system operation and avoids damage to the equipment under abnormal high-pressure conditions.

[0025] In summary, this invention achieves efficient utilization of waste heat from the dishwasher's steam through innovative designs such as multi-stage condensation, reverse heat exchange between the refrigerant and water flows, integrated steam recovery, and dynamic control of ambient air entering the evaporator for heat exchange. It can provide the dishwasher with high-temperature hot water exceeding 85 degrees Celsius, while the low-temperature evaporator absorbs steam-saving heat, reducing ambient temperature and lowering energy consumption by over 35%, extending equipment lifespan by 30%. This provides key technological support for the green and energy-saving operation of commercial dishwashers. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a steam heat exchange heat pump system for a commercial dishwasher, provided as an exemplary embodiment of the present invention.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Compressor; 2. First condenser heat exchanger; 3. Second condenser heat exchanger; 4. Third condenser heat exchanger; 5. First-stage flow-limiting pipe; 6. Second-stage flow-limiting pipe; 7. Third-stage flow-limiting pipe; 8. Return gas enthalpy-increasing heat exchanger; 9. Condensation-evaporation exchanger; 10. Throttling main capillary tube; 11. First main throttling device; 12. Evaporator; 13. Gas inlet; 14. Steam integrated hood; 15. Blower; 16. Drain pipe; 17. Dishwasher; 18. Unloading valve; 19. Second throttling capillary tube; 20. Steam heat exchange system; 21. Exhaust fan.

[0029] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0030] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] Reference Figure 1 An embodiment of the present invention provides an embodiment of a vapor heat exchange heat pump system for a commercial dishwasher, including a compressor 1, an evaporator 12, a throttling element and a condensation heat exchange assembly;

[0033] It also includes a three-stage condenser heat exchanger, a return gas enthalpy-increasing heat exchanger 8, a condenser-evaporator heat exchanger 9, and a steam heat exchange system 20;

[0034] The refrigerant channels of the three-stage condensing heat exchanger are connected in series through flow-limiting pipes, and its water channel and refrigerant channel are arranged in counter-current arrangement.

[0035] The steam heat exchange system 20 includes a steam inlet pipe 16 connected to the dishwasher 17, a blower 15, and a steam integration hood 14 covering the evaporator 12.

[0036] The input end of the return gas enthalpy-increasing heat exchanger 8 is connected to the refrigerant outlet of the third condensing heat exchanger 4, and the output end is connected to the condensing evaporating heat exchanger 9.

[0037] The condenser-evaporator exchanger 9 has three outputs: the first output is connected to the inlet of the evaporator 12 via the first main throttle 11, the second output is connected to its own evaporation channel via the second throttle cap 19, and the third output is directly connected to the return gas end of the compressor 1.

[0038] The outlet of the evaporator 12 is connected in sequence to the refrigerant channel of the return gas enthalpy-increasing heat exchanger 8, the evaporation channel of the condenser-evaporator exchanger 9, and then to the compressor 1.

[0039] It should be noted that the refrigerant channels of the three-stage condensing heat exchanger are connected in series via flow-limiting pipes, and the water channels and refrigerant channels are arranged in counter-current flow. This design improves condensing efficiency through counter-current heat exchange, maximizes the temperature gradient between the refrigerant and the water channels, and thus improves the heat recovery rate. The steam heat exchange system 20 is connected to the steam outlet of the dishwasher 17 via the guide pipe 16. The blower 15 drives steam into the steam integrated shroud 14, which includes the evaporator 12, to achieve efficient heat exchange between the steam and the surface of the evaporator 12. The return gas enthalpy-increasing heat exchanger 8 is connected to the refrigerant outlet of the third condensing heat exchanger 4 and the condensing-evaporating exchanger 9. It further liquefies the gaseous refrigerant through evaporation heat absorption, reducing the evaporator temperature. The condensing-evaporating exchanger 9 has a three-way output design: the first path supplies liquid to the evaporator 12 via the first main throttling device 11; the second path replenishes the liquid in its own evaporation channel when the system is under high pressure via the second throttling capillary tube 19, thereby reducing the ultra-high pressure; and the third path directly returns the liquid to the return gas end of the compressor 1, forming a multi-stage heat recovery path. The outlet of evaporator 12 is connected to compressor 1 after passing through return gas enthalpy-increasing heat exchanger 8 and condenser-evaporator exchanger 9 in sequence, thus achieving efficient closed-loop refrigerant circulation.

[0040] The condensation efficiency is improved by using a three-stage condensing heat exchanger and a counter-current arrangement design; the steam integrated hood 14 and the blower 15 work together to enhance the contact heat exchange between steam and evaporator 12; the multi-output and return gas heat exchange design reduces the load on compressor 1 and improves the system energy efficiency ratio.

[0041] In some embodiments, the flow-limiting pipe includes a primary flow-limiting pipe 5, a secondary flow-limiting pipe 6, and a tertiary flow-limiting pipe 7, and the tertiary condensing heat exchanger includes a first condensing heat exchanger 2, a second condensing heat exchanger 3, and a third condensing heat exchanger 4 connected in series with the primary flow-limiting pipe 5, the secondary flow-limiting pipe 6, and the tertiary flow-limiting pipe 7.

[0042] The diameter of the flow-limiting pipe decreases in stages and is installed at the refrigerant outlet end of the corresponding condensing heat exchanger.

[0043] It should be noted that the three-stage condensing heat exchanger consists of a first condensing heat exchanger 2, a second condensing heat exchanger 3, and a third condensing heat exchanger 4, which are connected in series via a first-stage flow-limiting pipe 5, a second-stage flow-limiting pipe 6, and a third-stage flow-limiting pipe 7. The diameter of the flow-limiting pipes decreases progressively with each stage and is installed at the refrigerant outlet of the corresponding condensing heat exchanger.

[0044] The progressively decreasing flow-limiting piping design effectively regulates refrigerant flow, creating a pressure gradient between condensing heat exchangers. This prevents premature refrigerant saturation in the upstream condenser, ensuring that each stage of the condenser operates under optimal heat exchange conditions. Simultaneously, the stepped arrangement of the flow-limiting piping balances the heat load distribution across the condensers, extending equipment lifespan.

[0045] By using a progressively decreasing flow-limiting pipe design, refrigerant distribution is optimized, condensation heat exchange efficiency is improved, and high-pressure surges in the system are avoided, thus enhancing operational stability.

[0046] In one example, the flow-limiting pipe includes a primary flow-limiting pipe 5, a secondary flow-limiting pipe 6, and a tertiary flow-limiting pipe 7, and the tertiary condensing heat exchanger includes a first condensing heat exchanger 2, a second condensing heat exchanger 3, and a third condensing heat exchanger 4 connected in series with the primary flow-limiting pipe 5, the secondary flow-limiting pipe 6, and the tertiary flow-limiting pipe 7.

[0047] The diameter of the flow-limiting pipe decreases in stages and is installed at the refrigerant outlet end of the corresponding condensing heat exchanger.

[0048] It should be noted that the return gas enthalpy-increasing heat exchanger 8 adopts a plate heat exchanger structure. Its high-temperature side channel is connected to the refrigerant outlet of the third condensing heat exchanger 4, and its low-temperature side channel is connected to the outlet of the evaporator 12 and the return gas end of the compressor 1.

[0049] Plate heat exchangers feature high heat transfer coefficients and compact structures. Their corrugated plate design enhances turbulence between the refrigerant and return refrigerant, improving heat transfer efficiency. Furthermore, the modular design of plate heat exchangers facilitates maintenance and replacement, adapting to the frequent start-stop requirements of commercial dishwashers.

[0050] The high efficiency of plate heat exchangers significantly reduces the condensation temperature, further liquefying the refrigerant. On the other hand, it increases the return gas refrigerant temperature, causing it to vaporize, making the operating conditions of the circulation system more stable, reducing the superheat of compressor 1's suction gas, thereby reducing energy consumption and extending the life of compressor 1.

[0051] In one example, the steam integrated hood 14 is provided with an air inlet 13, which is equipped with an adjustable damper and is located on the airflow inlet side of the blower 15.

[0052] It should be noted that the steam integrated hood 14 is provided with an air inlet 13, which is configured with an adjustable damper to introduce ambient air. When the amount of recovered dishwasher steam is insufficient to meet the heat exchange requirements of the evaporator 12, sufficient ambient air is introduced through the air inlet 13 to meet the heat exchange requirements of the evaporator 12. In one example, the condenser-evaporator exchanger 9 includes mutually isolated condensation channels and evaporation channels, wherein:

[0053] The condensation channel inlet is connected to the output end of the return gas enthalpy-increasing heat exchanger 8, and the outlet is split to the first main throttling device 11, the throttling main capillary tube 10, and the second throttling capillary tube 19.

[0054] The inlet of the evaporation channel is connected to the second throttling capillary tube 19, and the outlet is connected to the return gas end of the compressor 1.

[0055] It should be noted that the condenser-evaporator exchanger 9 includes mutually isolated condensation and evaporation channels. The condensation channel inlet connects to the output of the return gas enthalpy-increasing heat exchanger 8, and the outlet is split to the first main throttling device 11 and the second throttling capillary tube 19; the evaporation channel inlet connects to the second throttling capillary tube 19, and the outlet connects to the return gas end of the compressor 1. The isolation design between the condensation and evaporation channels avoids direct contact between the hot and cold media, prevents thermal short circuits, and ensures that the condensation heat is fully utilized in the evaporation process. The pressure relief and throttling design of the second throttling capillary tube 19 prevents the occurrence of high pressure in the system. The 9th condenser-evaporator exchanger is designed for multiple condensation-evaporation heat exchanges to further liquefy the gaseous refrigerant, while increasing the return gas volume and temperature, thereby improving system stability.

[0056] In one example, the steam recovery path is as follows: dishwasher 17 → drain pipe 16 → blower 15 → steam integrated hood 14 → evaporator 12 → exhaust fan 21. When the amount of steam recovered is insufficient to meet the heat exchange requirements of the evaporator 12, the steam enters through the following path via ambient air: air inlet 13 → evaporator 12 → exhaust fan 21.

[0057] The inclined design of the guide pipe 16 reduces steam condensation losses, and the forced airflow of the blower 15 evenly guides the steam into the steam integrated hood 14, ensuring sufficient heat exchange between the evaporator 12 and the steam. The design of the air inlet 13 avoids insufficient steam flow and controls the air flow to meet the flow requirements for heat exchange in the evaporator.

[0058] In one example, an unloading valve 18 is provided between the exhaust end of the compressor 1 and the first condensing heat exchanger 2.

[0059] It should be noted that an unloading valve 18 is installed between the discharge end of compressor 1 and the first condensing heat exchanger 2. The unloading valve 18 automatically adjusts the refrigerant flow rate during system startup or under abnormal operating conditions to prevent excessively high discharge pressure from compressor 1, which could lead to mechanical damage. This design is controlled in conjunction with a pressure sensor to ensure that the refrigerant operates within a safe pressure range. The unloading valve 18 effectively avoids high-pressure surges, protecting compressor 1 and the condensing heat exchanger, extending system life, reducing the failure rate, and improving operational safety.

[0060] In practical applications, compressor 1 is first started, driving the refrigerant into the first condensing heat exchanger 2 for initial condensation and heat release. The condensation heat is transferred to the external water system through the counter-current arrangement of the water channel and the refrigerant channel, improving heat recovery efficiency. The refrigerant enters the second condensing heat exchanger 3 through the first-stage flow-limiting pipe 5, and is further depressurized through the second-stage flow-limiting pipe 6, allowing the refrigerant to continue condensing and releasing heat in the second condensing heat exchanger 3. Subsequently, it enters the third condensing heat exchanger 4 through the third-stage flow-limiting pipe 7, completing the three-stage condensation process. The progressively decreasing flow-limiting pipe design ensures a balanced distribution of refrigerant flow, avoids high-pressure impacts, and optimizes the condensation efficiency of each stage. At this time, the steam generated during the operation of dishwasher 17 is drawn into the blower 15 through the guide pipe 16. The steam is transferred to the steam integrated shroud 14 through the inclined guide pipe 16, making full contact with the heat exchange surface of the evaporator 12 covering its surface. The latent heat released by the steam is absorbed by the refrigerant, and the refrigerant absorbs heat and evaporates in the evaporator 12. At the same time, the air inlet 13 on the steam integrated shroud 14 introduces ambient air through the adjustable damper to ensure the heat exchange of the evaporator. After evaporation, the refrigerant enters the return gas enthalpy-increasing heat exchanger 8 sequentially from the outlet of evaporator 12. The high-temperature side channel of this plate heat exchanger receives the high-temperature refrigerant from the outlet of the third condensing heat exchanger 4, while the low-temperature side channel connects the return gas refrigerant from the outlet of evaporator 12 to the return gas end of compressor 1. Through the efficient heat exchange of the plate heat exchanger, the condensation heat is used to exchange heat with the return gas refrigerant, increasing the suction superheat of compressor 1. The pre-cooled refrigerant enters the condensing-evaporating heat exchanger 9, whose condensing channel receives the output of the return gas enthalpy-increasing heat exchanger 8. The condensation heat is distributed through a split path, supplying liquid to evaporator 12 via the first main throttling device 11, replenishing liquid to its own evaporation channel via the second throttling capillary tube 19, and directly returning to the return gas end of compressor 1 via a third path, forming a multi-stage heat recovery closed loop. An unloading valve 18 is installed between the discharge end of compressor 1 and the first condensing heat exchanger 2, automatically adjusting the refrigerant pressure during system startup or abnormal operating conditions to prevent high-pressure surges from damaging the equipment. By utilizing the return gas enthalpy-increasing heat exchanger 8 and the condenser-evaporator exchanger 9 in stages, the system energy efficiency ratio is significantly improved. At the same time, the evaporator 12, the steam integrated hood 14, and the air injection port 13 work together to control the air flow to achieve efficient steam recovery and utilization, ultimately completing the closed loop of refrigerant circulation and the cascade recovery of steam energy.

[0061] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the content of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A vapor heat exchange heat pump system for commercial dishwashers, comprising a compressor (1), an evaporator (12), a throttling element, and a condensation heat exchange assembly; characterized in that: It also includes a three-stage condenser heat exchanger, a return gas enthalpy-increasing heat exchanger (8), a condenser-evaporator heat exchanger (9), and a steam heat exchange system (20). The refrigerant channels of the three-stage condensing heat exchanger are connected in series through flow-limiting pipes, and its water channel and refrigerant channel are arranged in counter-current arrangement. The steam heat exchange system (20) includes a drain pipe (16) connected to the steam outlet of the dishwasher (17), a blower (15), and a steam integrated hood (14) covering the evaporator (12). The input end of the return gas enthalpy-increasing heat exchanger (8) is connected to the refrigerant outlet of the third condensing heat exchanger (4), and the output end is connected to the condensing evaporating heat exchanger (9). The condenser-evaporator (9) has three outputs: the first output is connected to the inlet of the evaporator (12) via the first main throttle (11); the second output is connected to its own evaporation channel via the second throttle tube (19); and the third output is directly connected to the return gas end of the compressor (1). The outlet of the evaporator (12) is connected in sequence to the refrigerant channel of the return gas enthalpy-increasing heat exchanger (8), the evaporation channel of the condenser-evaporator (9), and then connected to the compressor (1).

2. The steam heat exchange heat pump system for a commercial dishwasher according to claim 1, characterized in that, The flow-limiting pipe includes a first-level flow-limiting pipe (5), a second-level flow-limiting pipe (6) and a third-level flow-limiting pipe (7). The third-level condensing heat exchanger includes a first condensing heat exchanger (2), a second condensing heat exchanger (3) and a third condensing heat exchanger (4) connected in series with the first-level flow-limiting pipe (5), the second-level flow-limiting pipe (6) and the third-level flow-limiting pipe (7). The diameter of the flow-limiting pipe decreases in stages and is installed at the refrigerant outlet end of the corresponding condensing heat exchanger.

3. The steam heat exchange heat pump system for a commercial dishwasher according to claim 1, characterized in that, The return gas enthalpy-increasing heat exchanger (8) is a plate heat exchanger. Its high-temperature side channel is connected to the refrigerant outlet of the third condenser heat exchanger (4), and its low-temperature side channel is connected to the outlet of the evaporator (12) and the return gas end of the compressor (1).

4. The steam heat exchange heat pump system for a commercial dishwasher according to claim 1, characterized in that, The steam integrated hood (14) is provided with an air supply port (13), which is equipped with an adjustable damper and is located on the airflow inlet side of the blower (15).

5. The steam heat exchange heat pump system for a commercial dishwasher according to claim 1, characterized in that, The condenser-evaporator (9) includes mutually isolated condensation channels and evaporation channels, wherein: The condensation channel inlet is connected to the output end of the return gas enthalpy-increasing heat exchanger (8), and the outlet is split to the first main throttle valve (11) and the throttle main capillary tube (10) and the second throttle capillary tube (19). The inlet of the evaporation channel is connected to the second throttling capillary tube (19), and the outlet is connected to the return gas end of the compressor (1).

6. The steam heat exchange heat pump system for a commercial dishwasher according to claim 1, characterized in that, An unloading valve (18) is provided between the exhaust end of the compressor (1) and the first condensing heat exchanger (2).

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