A plate evaporator and a refrigeration apparatus

Abstract

The present application discloses a plate evaporator and a refrigeration apparatus. The plate evaporator comprises a plate-shaped evaporator shell and a refrigerant shell sealingly mounted on the evaporator shell. At least one refrigerant channel is enclosed between the refrigerant shell and the evaporator shell. The refrigerant channel is coiledly arranged on a heat-conducting surface of the evaporator shell, allowing a condensed liquid within the channel to act on the heat-conducting surface. The two ends of the refrigerant channel are respectively connected to a condenser and a compressor through pipes. The present application improves heat conduction efficiency and the cooling performance of the evaporator, features a simple overall structure, and has a low production cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of refrigeration technology, and more particularly to a plate evaporator and a refrigeration apparatus.BACKGROUND

[0002] The evaporator is an important component in refrigeration apparatus, used for performing heat exchange work; for example, a low-temperature condensed liquid exchanges heat with the outside air through the evaporator, vaporizing and absorbing heat to achieve a cooling effect. Currently, the evaporators of some refrigeration apparatus generally include an evaporator body and a coil. The evaporator body includes inner and outer shells, and the coil is disposed on the inner shell and is in contact with the inner wall of the outer shell. When a condensed liquid flows through the coil, the condensed liquid performs heat exchange with the outside through the wall of the coil and the wall of the outer shell to achieve a cooling effect. However, in the aforementioned structure, heat must be conducted through the wall of the coil and the wall of the outer shell. Due to the multiple heat conduction media, the heat conduction efficiency is affected, resulting in a lower cooling effect. Moreover, the overall structure is relatively complex and the cost is high.SUMMARY

[0003] The technical problem to be solved by the present application is to provide a plate evaporator and a refrigeration apparatus that can improve heat conduction efficiency and the cooling performance of the evaporator, and has a simple overall structure and low production cost.

[0004] To solve the aforementioned technical problem, the present application provides a plate evaporator, comprising a plate-shaped evaporator shell and a refrigerant shell. The refrigerant shell is sealingly mounted on the evaporator shell, and at least one refrigerant channel is enclosed between the refrigerant shell and the evaporator shell. The refrigerant channel is coiledly arranged on a heat-conducting surface of the evaporator shell, the heat-conducting surfaceis arranged to be acted upon by a condensed liquid in the refrigerant channel, and two ends of the refrigerant channel are respectively connected to a condenser and a compressor through pipes.

[0005] As an improvement to the aforementioned technical scheme, the refrigerant shell is provided with at least one coiled groove. An opening of the groove faces the heat-conducting surface, and the groove and the heat-conducting surface enclose and form the refrigerant channel. The groove is in a planar spiral shape or a planar Z-shaped folded configuration.

[0006] As an improvement to the aforementioned technical scheme, the refrigerant shell is provided with at least one pair of grooves. Each pair of the grooves is arranged collocatedly on the same plane and is centrally symmetric about the same central axis. Each pair of the grooves and the heat-conducting surface respectively enclose and form a corresponding refrigerant channel.

[0007] As an improvement to the aforementioned technical scheme, two ends of the groove are respectively provided with an inlet portion and an outlet portion, and the inlet portion and the outlet portion are respectively in communication with the refrigerant channel. One end of the refrigerant channel is sequentially connected to the condenser via the inlet portion and a refrigerant inlet pipe, and the other end of the refrigerant channel is sequentially connected to the compressor via the outlet portion and a refrigerant outlet pipe.

[0008] As an improvement to the aforementioned technical scheme, the refrigerant shell is provided with a groove extending in a reciprocatingly bent manner along a length direction or a width direction of the heat-conducting surface. The groove is in a Z-shaped folded configuration, an opening of the groove faces the heat-conducting surface, and the groove and the heat-conducting surface enclose and form the refrigerant channel.

[0009] As an improvement to the aforementioned technical scheme, the groove comprises a plurality of straight pipe sections and a plurality of bent pipe sections. Adjacent two straight pipe sections are arranged in parallel, and each of the bent pipe sections respectively connects the same end of adjacent two of the straight pipe sections.

[0010] As an improvement to the aforementioned technical scheme, a head end and a tail end of the groove are respectively provided with an inlet portion and an outlet portion, and the inlet portion and the outlet portion are respectively in communication with the refrigerant channel. One end of the refrigerant channel is sequentially connected to the condenser via the inlet portion and a refrigerant inlet pipe, and the other end of the refrigerant channel is sequentially connected to the compressor via the outlet portion and a refrigerant outlet pipe.

[0011] As an improvement to the aforementioned technical scheme, the groove is provided with an inlet portion and an outlet portion. Either one of the inlet portion and the outlet portion is disposed at a middle section of the groove, while the other is disposed at a head end and a tail end of the groove, respectively. The inlet portion and the outlet portion are respectively in communication with the refrigerant channel, and the inlet portion and the outlet portion are respectively disposed at opposite ends of the refrigerant shell. One end of the refrigerant channel is sequentially connected to the condenser via the inlet portion and a refrigerant inlet pipe, and the other end of the refrigerant channel is sequentially connected to the compressor via the outlet portion and a refrigerant outlet pipe.

[0012] As an improvement to the aforementioned technical scheme, a head end and a tail end of the groove are in communication with each other. One end of the groove is provided with an inlet portion, and the other end of the groove is provided with an outlet portion. The inlet portion and the outlet portion are respectively in communication with the refrigerant channel. One end of the refrigerant channel is sequentially connected to the condenser via the inlet portion and a refrigerant inlet pipe, and the other end of the refrigerant channel is sequentially connected to the compressor via the outlet portion and a refrigerant outlet pipe.

[0013] As an improvement to the aforementioned technical scheme, the inlet portion is internally provided with an inlet groove in communication with the refrigerant channel. The inlet portion is provided with an outwardly extending inlet port, the inlet port is in communication with the inlet groove, and the refrigerant inlet pipe is inserted into the inlet port. The outlet portion is internally provided with an outlet groove in communication with the refrigerant channel, the outlet portion is provided with an outwardly extending outlet port, the outlet port is in communication with the outlet groove, and the refrigerant outlet pipe is inserted into the outlet port.

[0014] As an improvement to the aforementioned technical scheme, the groove is provided with a plurality of intermediate inlet ports spaced apart along a flow direction of the refrigerant channel. The intermediate inlet ports are in communication with the refrigerant channel. The intermediate inlet ports are located between the inlet port and the outlet port, and the intermediate inlet ports are connected to the condenser through corresponding refrigerant inlet pipes.

[0015] As an improvement to the aforementioned technical scheme, a cross-section of the groove is semi-circular, triangular, square, or rectangular.

[0016] As an improvement to the aforementioned technical scheme, the evaporator shell is made of a thermally conductive material, and the refrigerant shell is made of plastic, silicone, or metal.

[0017] As an improvement to the aforementioned technical scheme, the evaporator shell has at least a partial straight plate portion, and the evaporator shell is square, circular, or elliptical.

[0018] The present application also provides a refrigeration apparatus, comprising a body, wherein the aforementioned evaporator is disposed within the body. The refrigeration apparatus is an ice cream machine, a slush machine, a cold drink machine, or an ice maker.

[0019] The beneficial effects of implementing the present application are as follows:

[0020] The present application encloses and forms a refrigerant channel between a plate-shaped refrigerant shell and an evaporator shell. The refrigerant channel is coiledly arranged on a heat-conducting surface of the evaporator shell, and the heat-conducting surface is arranged to be acted upon by a condensed liquid in the refrigerant channel to directly perform heat exchange work with the outside through the shell wall of the heat-conducting surface. By reducing the heat conduction media, the heat conduction efficiency of the evaporator can be effectively improved, thereby greatly enhancing the cooling performance of the evaporator. Moreover, the overall structure is simple, which can save assembly space and reduce production costs. At the same time, the refrigerant channel can guide the flow of the condensed liquid to increase its flow velocity and the heat exchange effect.BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG. 1 is a schematic structural diagram of a first embodiment of the plate evaporator of the present application. FIG. 2 is an exploded schematic structural diagram of the plate evaporator of the present application. FIG. 3 is a schematic structural diagram of the refrigerant shell of the present application. FIG. 4 is a schematic cross-sectional structural diagram of the plate evaporator of the present application. FIG. 5 is a schematic structural diagram of a second embodiment of the plate evaporator of the present application. FIG. 6 is a schematic structural diagram of a third embodiment of the plate evaporator of the present application. FIG. 7 is a schematic structural diagram of a fourth embodiment of the plate evaporator of the present application. FIG. 8 is a schematic structural diagram of a fifth embodiment of the plate evaporator of the present application. FIG. 9 is a schematic structural diagram of a sixth embodiment of the plate evaporator of the present application. DETAILED DESCRIPTION

[0022] To make the objectives, technical schemes, and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings.

[0023] As shown in FIGS. 1 to 4, which show schematic structural diagrams of a first embodiment of the plate evaporator of the present application, the plate evaporator comprises a plate-shaped evaporator shell 1 and a refrigerant shell 2. The refrigerant shell 2 is sealingly mounted on the evaporator shell 1, and the two together construct a flat, cake-shaped plate evaporator to reduce the overall space occupied. A refrigerant channel 3 is enclosed between the refrigerant shell 2 and the evaporator shell 1. The refrigerant channel 3 is coiledly arranged on a heat-conducting surface 11 of the evaporator shell 1. A condensed liquid in the refrigerant channel 3 acts on the heat-conducting surface 11 to perform heat exchange work with the outside via the heat-conducting surface 11. Two ends of the refrigerant channel 3 are respectively connected to a condenser and a compressor through pipes.

[0024] During operation, the condenser transports the condensed liquid to the refrigerant channel 3 through a pipe. The condensed liquid flowing into the refrigerant channel 3 acts on one side heat-conducting surface 11 of the evaporator shell 1. The condensed liquid absorbs heat from the outside through the shell wall of the heat-conducting surface 11, thereby performing heat exchange work with the ambient air. The gas produced after the condensed liquid vaporizes will be discharged back to the compressor through a refrigerant outlet pipe 5. Herein, the refrigerant channel 3 can guide the flow of the condensed liquid to make the condensed liquid form a consistent flow trend, reducing vortices and resistance that may be generated due to inconsistent directions, thereby increasing the flow velocity and heat exchange efficiency of the condensed liquid. At the same time, the condensed liquid only needs to pass through the shell wall of the heat-conducting surface 11 (i.e., a single-layer heat conduction medium) to perform heat exchange work with the outside. By reducing the heat conduction media, the heat conduction efficiency can be effectively improved, thereby enhancing the cooling performance of the evaporator, and also simplifying the overall structure, saving assembly space, and reducing production costs.

[0025] Specifically, as shown in FIGS. 2 to 4, the refrigerant shell 2 is provided with at least one coiled groove 21. An opening of the groove 21 faces the heat-conducting surface 11, and the groove 21 and the heat-conducting surface 11 enclose and form the refrigerant channel 3. The condensed liquid in the refrigerant channel 3 can contact the heat-conducting surface 11 of the evaporator shell 1 through the opening of the groove and perform heat exchange work with the outside through the shell wall of the heat-conducting surface 11 to achieve the cooling effect of the evaporator. Herein, the groove 21 is in a planar spiral shape, but is not limited thereto, and may also be in a planar Z-shaped folded configuration or other regular or irregular shapes.

[0026] Furthermore, the cross-section of the groove 21 is semi-circular. Through the contact diameter of this semi-circle (i.e., the diameter of the groove opening), the contact width between the condensed liquid and the evaporator shell 1 is maximized, that is, the heat exchange contact area is increased, thereby improving the heat conduction efficiency of the condensed liquid and thus enhancing the cooling efficiency of the evaporator. Preferably, the cross-section of the groove 21 can also be triangular, square, or rectangular, etc., which is not excessively limited here; the shape of the cross-section only needs to satisfy the maximization of the contact diameter (i.e., the diameter of the groove opening).

[0027] Further, as shown in FIGS. 2 to 4, two ends of the groove 21 are respectively provided with an inlet portion 22 and an outlet portion 23. The inlet portion 22 and the outlet portion 23 are respectively in communication with the refrigerant channel 3. One end of the refrigerant channel 3 is sequentially connected to the condenser via the inlet portion 22 and a refrigerant inlet pipe 4, so that the condenser allows the condensed liquid to flow into the refrigerant channel 3 through the refrigerant inlet pipe 4 and the inlet portion 22, thereby causing the condensed liquid to gradually vaporize in the refrigerant channel 3 and perform heat exchange work. The other end of the refrigerant channel 3 is sequentially connected to the compressor via the outlet portion 23 and a refrigerant outlet pipe 5. When the condensed liquid in the refrigerant channel 3 vaporizes, the gas produced by its vaporization is discharged back to the compressor through the outlet portion 23 and the refrigerant outlet pipe 5, realizing a cooling cycle and improving the cooling effect of the evaporator.

[0028] Herein, the inlet portion 22 is internally provided with an inlet groove 221 in communication with the refrigerant channel 3. The inlet portion 22 is provided with an outwardly extending inlet port 222, the inlet port 222 is in communication with the inlet groove 221, and one end of the refrigerant inlet pipe 4 is inserted into the inlet port 222 and connected by welding to improve connection stability and sealing performance. The outlet portion 23 is internally provided with an outlet groove 231 in communication with the refrigerant channel 3. The outlet portion 23 is provided with an outwardly extending outlet port 232, the outlet port 232 is in communication with the outlet groove 231, and one end of the refrigerant outlet pipe 5 is inserted into the outlet port 232 and connected by welding to improve connection stability and sealing performance. During operation, the condensed liquid transported by the condenser flows into the refrigerant channel 3 sequentially through the refrigerant inlet pipe 4, the inlet port 222, and the inlet groove 221, thereby causing the condensed liquid to gradually vaporize in the refrigerant channel 3 and perform heat exchange work. When the condensed liquid in the refrigerant channel 3 vaporizes, the gas produced by its vaporization is discharged back to the compressor sequentially through the outlet groove 231, the outlet port 232, and the refrigerant outlet pipe 5, realizing a cooling cycle and improving the cooling effect of the evaporator.

[0029] Preferably, the evaporator shell 1 is made of a thermally conductive material. In this embodiment, the material of the evaporator shell 1 is preferably metal, which has a good heat conduction effect and can improve cooling performance. In other embodiments, the user may also use other thermally conductive materials with good heat conduction effects.

[0030] Preferably, in this embodiment, the material of the refrigerant shell 2 is preferably plastic or silicone to reduce unnecessary heat loss and improve the heat transfer effect at the heat-conducting surface 11, thereby improving the cooling effect of the evaporator. In other embodiments, the user may also use other materials with poor thermal conductivity. Furthermore, the material of the refrigerant shell 2 may also be preferably metal; through this thermally conductive metal material, a cooling effect can be exerted on the outer space and external objects of the refrigerant shell.

[0031] Preferably, the evaporator shell 1 has at least a partial straight plate portion 12. For example, the evaporator body 1 as a whole is a straight plate portion 12, or the evaporator body 1 has a straight plate portion 12, and the peripheral edges or one side edge of the straight plate portion 12 is flanged to form a flanged portion 13, resulting in a small overall occupied space and volume. Herein, the evaporator shell 1 is preferably circular or elliptical, but is not limited to this.

[0032] As shown in FIG. 5, which shows a schematic structural diagram of a second embodiment of the plate evaporator of the present application, this embodiment differs from the first embodiment shown in FIGS. 1 to 4 in that the groove 21 is provided with a plurality of intermediate inlet ports 24 spaced apart along the flow direction of the refrigerant channel 3. The intermediate inlet ports 24 are in communication with the refrigerant channel 3. The intermediate inlet ports 24 are located between the inlet port 222 and the outlet port 232, and the intermediate inlet ports 24 are connected to the condenser through corresponding refrigerant inlet pipes 4. When the evaporator is in operation, the condensed liquid from the condenser flows into different positions of the refrigerant channel 3 simultaneously through the inlet port 222 and the plurality of intermediate inlet ports 24 and acts on corresponding positions of the heat-conducting surface of the evaporator shell 1, so that the low-temperature condensed liquid can quickly perform heat exchange work at different positions of the evaporator, accelerating the overall cyclic heat exchange rate of the condensed liquid, thereby improving the cooling efficiency of the evaporator.

[0033] As shown in FIG. 6, which shows a schematic structural diagram of a third embodiment of the plate evaporator of the present application, this embodiment differs from the first embodiment shown in FIGS. 1 to 4 in that the refrigerant shell 2 is provided with at least one pair of grooves 21. Each pair of the grooves 21 is arranged collocatedly on the same plane and is centrally symmetric about the same central axis. Each pair of the grooves 21 and the heat-conducting surface respectively enclose and form a corresponding refrigerant channel 3, and the two refrigerant channels 3 are in a planar double spiral shape. By providing two independent refrigerant channels 3, condensed liquid can flow in simultaneously and act together on the heat-conducting surface of the evaporator shell 1, accelerating the heat exchange work between the heat-conducting surface and the outside, which can effectively improve the heat exchange efficiency and effect of the condensed liquid, thereby enhancing the cooling efficiency of the evaporator.

[0034] As shown in FIG. 7, which shows a schematic structural diagram of a fourth embodiment of the plate evaporator of the present application, this embodiment differs from the first embodiment shown in FIGS. 1 to 4 in that the evaporator body 1 is preferably square, but is not limited thereto. The refrigerant shell 2 is provided with a groove 21 extending in a reciprocatingly bent manner along a length direction or a width direction of the heat-conducting surface. The groove 21 is in a Z-shaped folded configuration, an opening of the groove 21 faces the heat-conducting surface, and the groove 21 and the heat-conducting surface enclose and form the refrigerant channel. Herein, the groove comprises a plurality of straight pipe sections 25 and a plurality of bent pipe sections 26. Adjacent two straight pipe sections 25 are arranged in parallel, and each of the bent pipe sections 26 respectively connects the same end of adjacent two of the straight pipe sections, so as to guide the flow of the condensed liquid and increase the contact area between the condensed liquid and the heat-conducting surface, improving the cooling effect of the evaporator.

[0035] During operation, the condenser transports the condensed liquid to the refrigerant channel 3 through a pipe. The condensed liquid flowing into the refrigerant channel 3 acts on one side heat-conducting surface of the evaporator shell 1. The condensed liquid absorbs heat from the outside through the shell wall of the heat-conducting surface, thereby performing heat exchange work with the ambient air. The gas produced after the condensed liquid vaporizes will be discharged back to the compressor through the refrigerant outlet pipe 5. Herein, the refrigerant channel 3 can guide the flow of the condensed liquid to make the condensed liquid form a consistent flow trend, reducing vortices and resistance that may be generated due to inconsistent directions, thereby increasing the flow velocity and heat exchange efficiency of the condensed liquid. At the same time, the condensed liquid only needs to pass through the shell wall of the heat-conducting surface (i.e., a single-layer heat conduction medium) to perform heat exchange work with the outside. By reducing the heat conduction media, the heat conduction efficiency can be effectively improved, thereby enhancing the cooling performance of the evaporator, and also simplifying the overall structure, saving assembly space, and reducing production costs.

[0036] A head end and a tail end of the groove 21 are respectively provided with an inlet portion 22 and an outlet portion 23, and the inlet portion 22 and the outlet portion 23 are respectively in communication with the refrigerant channel 3. One end of the refrigerant channel 3 is sequentially connected to the condenser via the inlet portion 22 and the refrigerant inlet pipe 4, and the other end of the refrigerant channel 3 is sequentially connected to the compressor via the outlet portion 23 and the refrigerant outlet pipe 5. During operation, the condensed liquid transported by the condenser flows into the refrigerant channel 3 sequentially through the refrigerant inlet pipe 4, the inlet port 222, and the inlet groove 221, thereby causing the condensed liquid to gradually vaporize in the refrigerant channel 3 and perform heat exchange work. When the condensed liquid in the refrigerant channel 3 vaporizes, the gas produced by its vaporization is discharged back to the compressor sequentially through the outlet groove 231, the outlet port 232, and the refrigerant outlet pipe 5, realizing a cooling cycle and improving the cooling effect of the evaporator.

[0037] As shown in FIG. 8, which shows a schematic structural diagram of a fifth embodiment of the plate evaporator of the present application, this embodiment differs from the fourth embodiment shown in FIG. 7 in that the groove 21 is provided with an inlet portion 22 and an outlet portion 23. Either one of the inlet portion 22 and the outlet portion 23 is disposed at a middle section of the groove 21, while the other is disposed at a head end and a tail end of the groove 21, respectively. The inlet portion 22 and the outlet portion 23 are respectively in communication with the refrigerant channel 3 to form a refrigerant channel 3 with a single inlet and two independent outlets, or a refrigerant channel 3 with a single outlet and two independent inlets.

[0038] Specifically, as shown in FIG. 8, this embodiment forms a refrigerant channel 3 with a single inlet and two independent outlets. The inlet portion 22 and the outlet portion 23 are respectively disposed at opposite ends of the refrigerant shell 2. Moreover, the two outlet portions 23 are respectively arranged at different heights on the same vertical plane to ensure that two refrigerant channels 3 of the same path length are formed, thereby enabling the condensed liquid to conduct heat uniformly to the heat-conducting surface and improving the uniformity of the cooling effect. One end of the two refrigerant channels 3 is sequentially connected to the condenser via the same inlet portion 22 and the refrigerant inlet pipe 4, and the other end of the two refrigerant channels 3 is sequentially connected to the compressor via the corresponding outlet portion 23 and the refrigerant outlet pipe 5. During operation, after the condensed liquid output from the condenser flows in from the inlet portion 22, it will flow along the flow directions of the left refrigerant channel 3 and the right refrigerant channel 3, respectively. The vaporized gas is output from the corresponding outlet portions 23 to the compressor. This method can accelerate the contact heat exchange efficiency between the condensed liquid and the heat-conducting surface, thereby effectively improving the heat exchange effect of the condensed liquid and thus enhancing the cooling efficiency of the evaporator.

[0039] As shown in FIG. 9, which shows a schematic structural diagram of a sixth embodiment of the evaporator of the present application, this embodiment differs from the fifth embodiment shown in FIG. 8 in that a head end and a tail end of the groove 21 are in communication with each other. One end of the groove 21 is provided with an inlet portion 22, and the other end of the groove 21 is provided with an outlet portion 23 directly opposite the inlet portion 22, so as to divide the entire head-to-tail connected refrigerant channel 3 into left and right side refrigerant channels 3. The inlet portion 22 and the outlet portion 23 are respectively in communication with the left and right side refrigerant channels 3. One end of the two refrigerant channels 3 is sequentially connected to the condenser via the same inlet portion 22 and the refrigerant inlet pipe 4, and the other end of the two refrigerant channels 3 is sequentially connected to the compressor via the same outlet portion 23 and the refrigerant outlet pipe 5. During operation, after the condensed liquid output from the condenser flows in from the inlet portion 22, it will flow along the flow directions of the left refrigerant channel 3 and the right refrigerant channel 3, respectively. The vaporized gas is output from the same outlet portion 23 to the compressor to accelerate the contact heat exchange efficiency between the condensed liquid and the heat-conducting surface, thereby effectively improving the heat exchange effect of the condensed liquid and thus enhancing the cooling efficiency of the evaporator.

[0040] The present application also provides a refrigeration apparatus, comprising a body, wherein the aforementioned plate evaporator is disposed within the body. Herein, the refrigeration apparatus is an ice cream machine, a slush machine, a cold drink machine, or an ice maker. Since the aforementioned plate evaporator has the aforementioned technical effects, the refrigeration apparatus including the said evaporator should also have the aforementioned technical effects, which will not be described one by one here.

[0041] In summary, the present application encloses and forms a refrigerant channel between a plate-shaped refrigerant shell and an evaporator shell. The refrigerant channel is coiledly arranged on a heat-conducting surface of the evaporator shell, and the heat-conducting surface is arranged to be acted upon by a condensed liquid in the refrigerant channel to directly perform heat exchange work with the outside through the shell wall of the heat-conducting surface. By reducing the heat conduction media, the heat conduction efficiency of the evaporator can be effectively improved, thereby greatly enhancing the cooling performance of the evaporator. Moreover, the overall structure is simple, which can save assembly space and reduce production costs. At the same time, the refrigerant channel can guide the flow of the condensed liquid to increase its flow velocity and the heat exchange effect.

[0042] The foregoing descriptions are merely preferred embodiments of the present application, and it should be noted that for a person of ordinary skill in the art, several improvements and modifications may be made without departing from the principles of the present application. These improvements and modifications are also to be considered within the protection scope of the present application.

Claims

1. A plate evaporator, comprising: a plate-shaped evaporator shell having a heat-conducting surface; and a refrigerant shell sealingly mounted on the evaporator shell, wherein the refrigerant shell and the evaporator shell together enclose at least one refrigerant channel; wherein the at least one refrigerant channel is coiledly arranged on the heat-conducting surface, the heat-conducting surface is arranged to be acted upon by a condensed liquid in the refrigerant channel, and two ends of the at least one refrigerant channel are respectively connected to a condenser and a compressor through pipes.

2. The plate evaporator of claim 1, wherein the refrigerant shell is provided with at least one coiled groove, an opening of the groove faces the heat-conducting surface, and the groove and the heat-conducting surface enclose and form the refrigerant channel; wherein the groove is in a planar spiral shape or a planar Z-shaped folded configuration.

3. The plate evaporator of claim 2, wherein the refrigerant shell is provided with at least one pair of the grooves, each pair of the grooves is arranged collocatedly on the same plane and is centrally symmetric about the same central axis, and each groove of the pair of grooves and the heat-conducting surface respectively enclose and form a corresponding refrigerant channel.

4. The plate evaporator of claim 2, wherein two ends of the groove are respectively provided with an inlet portion and an outlet portion, and the inlet portion and the outlet portion are respectively in communication with the refrigerant channel; wherein one end of the refrigerant channel is sequentially connected to the condenser via the inlet portion and a refrigerant inlet pipe, and the other end of the refrigerant channel is sequentially connected to the compressor via the outlet portion and a refrigerant outlet pipe.

5. The plate evaporator of claim 1, wherein the refrigerant shell is provided with a groove extending in a reciprocatingly bent manner along a length direction or a width direction of the heat-conducting surface, the groove is in a Z-shaped folded configuration, an opening of the groove faces the heat-conducting surface, and the groove and the heat-conducting surface enclose and form the refrigerant channel.

6. The plate evaporator of claim 5, wherein the groove comprises a plurality of straight pipe sections and a plurality of bent pipe sections, adjacent two of the straight pipe sections are arranged in parallel, and each of the bent pipe sections respectively connects the same end of the adjacent two of the straight pipe sections.

7. The plate evaporator of claim 5, wherein a head end and a tail end of the groove are respectively provided with an inlet portion and an outlet portion, and the inlet portion and the outlet portion are respectively in communication with the refrigerant channel; wherein one end of the refrigerant channel is sequentially connected to the condenser via the inlet portion and a refrigerant inlet pipe, and the other end of the refrigerant channel is sequentially connected to the compressor via the outlet portion and a refrigerant outlet pipe.

8. The plate evaporator of claim 5, wherein the groove is provided with an inlet portion and an outlet portion, either one of the inlet portion and the outlet portion is disposed at a middle section of the groove while the other is disposed at a head end and a tail end of the groove, respectively, the inlet portion and the outlet portion are respectively in communication with the refrigerant channel, and the inlet portion and the outlet portion are respectively disposed at opposite ends of the refrigerant shell; wherein one end of the refrigerant channel is sequentially connected to the condenser via the inlet portion and a refrigerant inlet pipe, and the other end of the refrigerant channel is sequentially connected to the compressor via the outlet portion and a refrigerant outlet pipe.

9. The plate evaporator of claim 5, wherein a head end and a tail end of the groove are in communication with each other, one end of the groove is provided with an inlet portion, and the other end of the groove is provided with an outlet portion, and the inlet portion and the outlet portion are respectively in communication with the refrigerant channel; wherein one end of the refrigerant channel is sequentially connected to the condenser via the inlet portion and a refrigerant inlet pipe, and the other end of the refrigerant channel is sequentially connected to the compressor via the outlet portion and a refrigerant outlet pipe.

10. The plate evaporator of any one of claims 4 and 7 to 9, wherein the inlet portion is internally provided with an inlet groove in communication with the refrigerant channel, the inlet portion is provided with an outwardly extending inlet port, the inlet port is in communication with the inlet groove, and a refrigerant inlet pipe is inserted into the inlet port; wherein the outlet portion is internally provided with an outlet groove in communication with the refrigerant channel, the outlet portion is provided with an outwardly extending outlet port, the outlet port is in communication with the outlet groove, and a refrigerant outlet pipe is inserted into the outlet port.

11. The plate evaporator of claim 10, wherein the groove is provided with a plurality of intermediate inlet ports spaced apart along a flow direction of the refrigerant channel, and the intermediate inlet ports are in communication with the refrigerant channel; wherein the intermediate inlet ports are located between the inlet port and the outlet port, and the intermediate inlet ports are connected to the condenser through corresponding refrigerant inlet pipes.

12. The plate evaporator of any one of claims 2 to 9, wherein a cross-section of the groove is semi-circular, triangular, square, or rectangular.

13. The plate evaporator of claim 1, wherein the evaporator shell is made of a thermally conductive material, and the refrigerant shell is made of plastic, silicone, or metal.

14. The plate evaporator of claim 1, wherein the evaporator shell has at least a partial straight plate portion, and the evaporator shell is square, circular, or elliptical.

15. A refrigeration apparatus, comprising: a body; and the plate evaporator of any one of claims 1 to 14, disposed within the body; wherein the refrigeration apparatus is an ice cream machine, a slush machine, a cold drink machine, or an ice maker.

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