An expansion valve and a heat exchange device

Abstract

This invention discloses an expansion valve and a heat exchange device, comprising an inner valve body and an outer valve body, which are fixed or limited in position. The inner valve body includes a valve body, a power head assembly, and a transmission rod assembly. The outer valve body includes a first interface portion and a second interface portion, wherein the first interface portion has a first interface and the second interface portion has a second interface. The inner valve body has a first inner interface corresponding to and communicating with the first interface and a second inner interface corresponding to and communicating with the second interface. At least two sealing rings are provided between the inner valve body and the outer valve body, and corresponding sealing grooves are provided in the inner valve body and / or the outer valve body, with the sealing rings partially located in the sealing grooves. In the axial height direction of the expansion valve, at least one sealing ring is higher than the first inner interface and lower than the second inner interface, or at least one sealing ring is arranged around the first inner interface and / or at least one sealing ring is arranged around the second inner interface. The inner valve body is standardized, and the outer valve body can be adjusted to achieve a fit according to system requirements.

Description

Technical Field

[0001] This invention relates to the field of refrigerant fluid control technology, and in particular to an expansion valve and a heat exchange device. Background Technology

[0002] The expansion valve is an important component of the refrigeration system. The expansion valve generally controls the valve opening by sensing the superheat at the evaporator outlet or compressor suction end of the refrigeration system, thereby achieving the purpose of regulating the refrigerant flow and throttling and reducing pressure in the system.

[0003] In the background technology, the opening degree of an expansion valve is generally adjusted by adjusting the valve core. In addition, due to different systems, the shape of the expansion valve will also be adjusted according to the system requirements, so there are relatively many models of expansion valves. Summary of the Invention

[0004] The purpose of this invention is to provide an expansion valve and a heat exchange device, which includes an inner valve body and an outer valve body. The inner valve body and the outer valve body are fixed or limitedly connected. The inner valve body can be standardized, while the outer valve body can be adjusted according to the needs of the system to achieve a matching.

[0005] This invention provides an expansion valve, comprising an inner valve body and an outer valve body, wherein the inner valve body and the outer valve body are fixedly or limitedly positioned; the inner valve body includes a valve body, a power head assembly, and a transmission rod assembly; the expansion valve further includes a valve core assembly and an adjusting assembly; the transmission rod assembly drivesly connects the power head assembly and the valve core assembly; the action of the power head assembly is transmitted to the valve core assembly through the transmission rod assembly, enabling the valve core assembly to move downward; the outer valve body includes a first interface portion and a second interface portion, the first interface portion having a first interface, and the second interface portion having a second interface; the inner valve body has a connection with the... A first inner interface corresponding to and connected to the first interface position, and a second inner interface corresponding to and connected to the second interface position; the expansion valve is provided with at least two sealing rings between the inner valve body and the outer valve body, and corresponding sealing grooves are provided in the inner valve body and / or the outer valve body, with at least a portion of the sealing rings located in the corresponding sealing grooves; in the axial height direction of the expansion valve, at least one sealing ring is higher than the first inner interface and lower than the second inner interface, or at least one sealing ring is arranged around the first inner interface and / or at least one sealing ring is arranged around the second inner interface. Thus, the sealing ring arrangement prevents the first inner interface and the second inner interface from directly communicating through the space between the inner valve body and the outer valve body. In this invention, the expansion valve includes an inner valve body and an outer valve body. The inner valve body includes a valve body and a power head assembly. The inner and outer valve bodies are fixed or limited, so when the system requires different interface structures and sizes, only the outer valve body needs to be replaced. The inner valve body can be standardized, and the inner and outer valve bodies are assembled later. The outer valve body can be adjusted according to requirements, which is beneficial for production management.

[0006] This invention also provides a heat exchange device, comprising the aforementioned expansion valve and a heat exchanger. The heat exchanger includes a heat exchange core, which comprises plates, including a first plate and a second plate. The heat exchange core includes stacked first and second plates. The first plate has a first corner hole and is approximately rectangular in shape. The first corner hole is located at a relative corner of the first plate. The second plate may have the same or similar structure as the first plate and has a second corner hole. The first and second corner holes are fitted together. The area between the first and second plates is the fluid flow region of the heat exchange core. The first and second plates are stacked sequentially to isolate the heat exchange core, forming a non-communicating first and second heat exchange channel. The expansion valve and heat exchanger assembly allows for standardized inner valve bodies and replaceable outer valve bodies, which is beneficial for production management. Attached Figure Description

[0007] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings and embodiments can be obtained based on the provided drawings without creative effort.

[0008] Figure 1 This is a cross-sectional schematic diagram of the expansion valve according to the first embodiment of the present invention;

[0009] Figure 2 for Figure 1 A three-dimensional structural diagram of the inner valve body;

[0010] Figure 3 for Figure 1 Front view of the inner valve body;

[0011] Figure 4 for Figure 3 A cross-sectional view of the inner valve body along the AA direction is shown.

[0012] Figure 5 for Figure 1 A three-dimensional structural schematic diagram of the valve body shown;

[0013] Figure 6 for Figure 1 A cross-sectional schematic diagram of one embodiment of the external valve body shown;

[0014] Figure 7 for Figure 6 A three-dimensional structural diagram of the external valve body is shown.

[0015] Figure 8 This is a schematic diagram of the structure of the inner valve body according to the second embodiment of the present invention;

[0016] Figure 9 This is a three-dimensional structural schematic diagram of the third embodiment of the expansion valve;

[0017] Figure 10 for Figure 9 A three-dimensional structural diagram of the outer valve body of the expansion valve shown.

[0018] Figure 11 for Figure 9 A schematic diagram of the retaining ring structure of the expansion valve shown;

[0019] Figure 12 This is a three-dimensional structural schematic diagram of the fourth embodiment of the expansion valve;

[0020] Figure 13 for Figure 12 A cross-sectional schematic diagram of the inner valve body of the expansion valve shown.

[0021] Figure 14 for Figure 12 A three-dimensional schematic diagram of one structure of the inner valve body of the expansion valve shown.

[0022] Figure 15 for Figure 12 A three-dimensional schematic diagram of the inner valve body of the expansion valve shown from another direction.

[0023] Figure 16 for Figure 12 A schematic diagram of the front view of the inner valve body of the expansion valve shown.

[0024] Figure 17 for Figure 12 A cross-sectional schematic diagram of the expansion valve shown.

[0025] Figure 18 for Figure 12 The diagram shows the exploded structure of the expansion valve.

[0026] Figure 19 for Figure 12 The diagram shows the left-side view of the expansion valve.

[0027] Figure 20 for Figure 12 The exploded structure of the expansion valve shown is a front view schematic diagram.

[0028] Figure 21 This is a schematic diagram of the fifth embodiment of the expansion valve;

[0029] Figure 22 This is a three-dimensional structural diagram of the expansion valve of the present invention used in a heat exchange device;

[0030] Figure 23 for Figure 22 A schematic diagram of the first and second plates of the heat exchanger shown.

[0031] Figure 24 for Figure 22 A cross-sectional schematic diagram of the heat exchange device shown.

[0032] Figure 25 for Figure 22 A top view of the heat exchange device shown. Detailed Implementation

[0033] The embodiments will now be described in detail with reference to the accompanying drawings. Numerous specific details are mentioned in the following description to provide a comprehensive understanding of the technical solutions of the present invention. However, those skilled in the art should understand that the present invention can be implemented without these specific details. It should also be understood that the specific components, devices, and features illustrated in the drawings and described herein are merely exemplary and should not be considered limiting.

[0034] The purpose of this invention is to provide an expansion valve comprising an inner valve body and an outer valve body, which are fixedly or partially connected. This fixed or partially connected connection ensures that the inner and outer valve bodies are relatively fixed or partially limited, preventing relative rotational displacement. In this invention, a transmission rod component connects the power head assembly and the valve core assembly. The power head assembly acts on the valve core assembly through the transmission rod component, enabling the valve core assembly to move downwards. Combined with an elastic element, the valve core assembly can move up and down. Specifically, when the moving part of the power head assembly moves downwards, it directly or indirectly abuts against and drives the transmission rod component downwards, thus driving the valve core assembly downwards. Conversely, when the moving part of the power head assembly moves upwards, the lower elastic element or similar element causes the valve core assembly to move upwards, driving the transmission rod component upwards.

[0035] See Figure 1 The present invention provides an expansion valve 10 according to a first embodiment. The expansion valve 10 includes an outer valve body 100 and an inner valve body 200. In this embodiment, the inner valve body 200 includes a valve body 11, a power head assembly 12, a transmission rod component 13, a valve core assembly 14, and an adjustment assembly 15.

[0036] The valve body 11 has an opening at the top. The power head assembly 12 is fixed to the valve body 11 by welding, and the power head assembly 12 is located at the top of the valve body 11. The adjusting assembly 15 is threadedly connected to the valve body 11 and is located near the bottom of the valve body 11. The inner valve body 200 has a valve chamber 16, and the valve core assembly 14 is located in the valve chamber 16. The valve core assembly 14 can change the flow area of ​​the valve port of the expansion valve through the power head assembly 12 and the transmission rod assembly 13, thereby adjusting the flow rate of the fluid passing through the expansion valve. The transmission rod assembly 13 is located in the inner valve body 200. Inside the expansion valve, the transmission rod component 13 is connected to the power head assembly 12 and the valve core assembly 14. The transmission rod component 13 can abut against the power head assembly 12, including direct and indirect contact. The transmission rod component 13 can abut against the valve core assembly 14, including direct and indirect contact. The transmission rod component 13 can move accordingly when the power head assembly 12 is heated or cooled, thereby abutting and driving the valve core assembly 14 to move up and down. Under the action of the power head assembly 12, the valve core assembly 14 can move up and down a certain distance to adjust the flow area of ​​the fluid flowing through the valve port of the expansion valve.

[0037] See Figure 2 and Figure 4The valve body 11 has a generally vertically extending structure and includes a first inner interface 111, a second inner interface 112, a third inner interface 113, and a fourth inner interface 114. The valve body 11 includes a first flow channel 115 and a throttling section 116. The first inner interface 111 is one interface of the first flow channel 115, and the second inner interface 112 is the other interface of the first flow channel 115. In this embodiment, the throttling section 116 has a valve port. The throttling section can cooperate with the valve core assembly to adjust the flow area at the valve port, thereby regulating the flow rate of the fluid passing through the valve port. The valve body 11 also includes a second flow channel 117, with the third inner interface 113 being one interface of the second flow channel 117 and the fourth inner interface 114 being the other interface of the second flow channel 117. In one specific application, fluid flows in through the first inner port 111, is throttled by the valve port of the throttling section, flows out through the second inner port 112 and then through the outer valve body. The fluid then flows in again through the outer valve body and through the third inner port 113, and flows out through the fourth inner port 114 and then through the outer valve body into the system. Of course, the second inner port 112 and the fourth inner port 114 can also be used as inlets, and the first inner port 111 and the third inner port 113 can also be used as outlets. Alternatively, the valve body can have only the first inner port 111 and the second inner port 112, with fluid flowing into the inner valve body through the first inner port 111 and out through the second inner port 112.

[0038] See Figure 4 In this embodiment, the expansion valve has the first inner interface 111 and the fourth inner interface 114 located on the same side of the valve body 11, and the second inner interface 112 and the third inner interface 113 located on the other side of the valve body 11. Along the axial direction of the transmission rod component, the first inner interface 111 is lower than the second inner interface 112, and the third inner interface 113 and the fourth inner interface 114 are approximately at the same height. The valve body 11 includes a first sealing groove 118, a second sealing groove 119, and a third sealing groove 120. The expansion valve includes a first sealing ring 131, a second sealing ring 132, and a third sealing ring 133. In the height direction, the first sealing groove 118 is located on the periphery above the third inner interface 113 and the fourth inner interface 114 of the valve body. The second sealing groove 119 is located on the periphery below the third inner interface 113 and the fourth inner interface 114 of the valve body. The second sealing groove 119 is located above the second inner interface 112. The third sealing groove 120 is located below the second inner interface 112 of the valve body and on the periphery above the first inner interface 111 of the valve body. The first sealing ring 131 is at least partially located in the first sealing groove 118. The second sealing ring 132 is at least partially located in the second sealing groove 119. The third sealing ring 133 is at least partially located in the third sealing groove 120.

[0039] See Figure 2 , Figure 3 and Figure 4The valve body 11 includes a valve body part 141, a valve body part 142, and a valve body part 143. The valve body part 141, valve body part 142, and valve body part 143 are generally cylindrical in shape. In cross-section, the radial diameter of the valve body part 141 is larger than that of the valve body part 142, and the radial diameter of the valve body part 142 is larger than that of the valve body part 143. In terms of height, the valve body part 143 is lower than the valve body part 142, and the valve body part 142 is lower than the valve body part 141. The maximum value of the valve body part 143 is smaller than that of the valve body part 142. The maximum point is smaller than the maximum point of valve body part 141. Valve body part 2 142 is located between valve body part 141 and valve body part 3 143. The first sealing ring 131 is located above valve body part 141. The second sealing ring 132 is located below valve body part 141 and above valve body part 2 142. The third sealing ring 133 is located below valve body part 2 141 and above valve body part 3 143. Or, the second sealing ring 132 is located between valve body part 141 and valve body part 2 142, and the third sealing ring 133 is located between valve body part 2 142 and valve body part 3 143. The third inner interface 113, the fourth inner interface 114, and the second flow channel 117 are located in the first part of the valve body 141. The second inner interface 112 is located in the second part of the valve body 142. The first inner interface 111 is located in the third part of the valve body 143. The first flow channel 115 is partially located in the second part of the valve body 142 and partially located in the third part of the valve body 143. The throttling part 116 is approximately located inside one or two of the three parts of the valve body 142, the third sealing groove 120, and the third part of the valve body 143, or in corresponding positions of the three parts. The first inner interface 111 and the second inner interface 112 are connected to the valve core assembly through the throttling part 116. The third sealing ring 133 prevents the first inner interface 111 and the second inner interface 112 from communicating with the outer valve body through the space between the outer wall of the valve body and the outer valve body. The second sealing ring 132 prevents the second inner interface 112 from communicating with the third inner interface 113 and the fourth inner interface 114 through the space between the outer wall of the valve body and the outer valve body. The size, shape, and interface of the inner valve body of this expansion valve can be standardized. Different outer valve bodies with different structures can be selected to match the expansion valve according to the needs of different systems, thereby improving production efficiency.

[0040] See Figure 1 , Figure 4 , Figure 6In this embodiment, the outer valve body 100 includes a first interface portion 121, a second interface portion 122, a third interface portion 123, and a fourth interface portion 124. The first interface portion 121 has a first interface 1211 and a first outer interface 1212, the second interface portion 122 has a second interface 1221 and a second outer interface 1222, the third interface portion 123 has a third interface 1231 and a third outer interface 1232, and the fourth interface portion 124 has a fourth interface 1241 and a fourth outer interface 1242. The first interface 1211 is positioned and connected to the first inner interface 111 of the inner valve body, the second interface 1221 is positioned and connected to the second inner interface 112 of the inner valve body, the third interface 1231 is positioned and connected to the third inner interface 113 of the inner valve body, and the fourth interface 1241 is positioned and connected to the fourth inner interface 114 of the inner valve body. Of course, this may only include the first interface 121 and the second interface 122, and the cavity inside the power head component can be connected to the part that needs to be sensed by a pipe.

[0041] See Figures 1-6 When the inner valve body 100 and the outer valve body 200 are assembled, the first inner interface 111 and the first interface 1211 are connected, the first outer interface 1212 is connected to the outside, the second inner interface 112 and the second interface 1221 are connected, the second outer interface 1222 is connected to the outside, the first interface 1211 is connected to the second interface 1221 through the first flow channel 115, the third inner interface 123 is connected to the third interface 1231, the third outer interface 1232 is connected to the outside, the fourth inner interface 114 is connected to the fourth interface 1241, the fourth outer interface 1242 is connected to the outside, and the third interface 1231 is connected to the fourth interface 1241 through the second flow channel 117.

[0042] The first interface 1211 is greater than or equal to the first inner interface 111 of the valve body 11; the second interface 1221 is greater than or equal to the second inner interface 112 of the valve body 11; the third interface 1231 is greater than or equal to the third inner interface 113 of the valve body 11; the fourth interface 1241 is greater than or equal to the fourth inner interface 114 of the inner valve body; the first outer interface 1212 of the first interface section 121 is greater than the first interface 1211; the second outer interface 1222 of the second interface section 122 is greater than the second interface 1221; the third outer interface 1232 of the third interface section 123 is greater than the third interface 1231; the fourth outer interface 1242 of the fourth interface section 124 is greater than the fourth interface 1241; the first outer interface 1212... The outer portion of the first external interface 1211 is greater than or equal to the inner portion of the first external interface 1221 near the inner valve body; the outer portion of the second external interface 1222 is greater than or equal to the inner portion of the second external interface 1221 near the inner valve body; the outer portion of the third external interface 1232 is greater than or equal to the inner portion of the third external interface 1231 near the inner valve body; and the outer portion of the fourth external interface 1242 is greater than or equal to the inner portion of the fourth external interface 1241 near the inner valve body. This has two advantages: firstly, it ensures that, within the allowable error range, each interface has sufficient flow area during the processing and assembly of the expansion valve, reducing flow resistance; secondly, it does not affect the position of the sealing groove and the installation of the internal disc spring, and it can reduce the overall size of the expansion valve. In this text, "size" refers to the size of the flow area. For example, "the outer portion of the first external interface 1212 is greater than or equal to the inner portion of the first external interface 1211 near the inner valve body." In cases where the shape is not perfectly regular, it means that the flow area of ​​the outer portion of the first external interface facing outward is greater than or equal to the flow area of ​​the inner portion facing inward.

[0043] See Figure 1 and Figure 5 The inner valve body 200 also includes a positioning part 24. In this embodiment, the positioning part 24 is located at the top relative to the valve body 11, above the first sealing groove 118. The positioning part 24 includes a positioning notch 25, and a first positioning surface 251 is formed at the positioning notch 25. The first positioning surface 251 can be a plane. See also Figure 1 and Figure 7The outer valve body 100 includes a mating positioning part 26, which can be a protruding structure. The mating positioning part 26 is located on the inner wall surface of the outer valve body 100 and includes a second positioning surface 261. In this embodiment, the second positioning surface 261 of the mating positioning part 26 is a planar structure. The mating positioning part 26 and the positioning notch 25 are mated together, and the first positioning surface 251 and the second positioning surface 261 are mated to prevent the inner valve body from rotating circumferentially relative to the outer valve body. In other words, when rotating, the first positioning surface 251 will abut against the second positioning surface 261, thereby achieving the positioning purpose. When the inner valve body 200 is assembled with the outer valve body 100, the positioning notch 25 and the mating positioning part 26 are matched. In this invention, a positioning notch 25 is provided in the circumferential direction of the positioning part 24, and a mating positioning part is provided in the corresponding part of the outer valve body. The two are mated to prevent the inner valve body 200 from rotating in the circumferential direction when the air conditioning system is working. Alternatively, the positioning and mating structure can be configured in reverse, with a notch on the inner wall of the outer valve body and a corresponding protrusion on the inner valve body, achieving the same positioning purpose. In this embodiment, the adjusting component is fixed to the valve body, such as by threads. Alternatively, the adjusting component can also be fixed to the outer valve body by threads. That is, the valve body component of the inner valve body is assembled with the outer valve body, and then the adjusting component is installed, or the valve core and adjusting component are installed, and the expansion valve is adjusted by the adjusting component. This avoids assembly errors and makes the control of the expansion valve more precise. The adjusting component can be threaded to the outer valve body or the inner valve body. In this embodiment, the positioning notch serves as the notch portion of the positioning structure, and the mating positioning portion serves as the protrusion portion of the positioning structure. In this text, the protrusion portion is a relatively regular shape with relatively more protrusions, while the notch portion or recess portion is a relatively regular shape with relatively fewer protrusions.

[0044] See Figure 8 The inner valve body 300 of the second embodiment of the present invention, which is identical to the inner valve body 200 of the first embodiment, will not be described again here. The inner valve body 300 includes a valve body 11, and the valve body 11 includes a positioning part 34. The positioning part 34 is located at least partially on the upper side of the first sealing groove 371. In this embodiment, the valve body has two positioning holes 372 in the positioning part 34, and the positioning part 34 also includes two pins 373. Each pin 373 is at least partially located in the positioning hole 372. The outer valve body has a recess at a position corresponding to the pin, and at least part of the pin is located in the recess of the outer valve body. The valve body 11 and the outer valve body are positioned by the pins 373. Alternatively, only one pin can be provided to achieve the same relative positioning purpose. In this embodiment, the pin serves as a protrusion of the positioning structure.

[0045] See Figure 1 , Figure 9 , Figure 10 as well as Figure 11The third embodiment of the present invention includes an outer valve body 400, which includes a limiting part 41 and a retaining groove 411; a power head assembly 12 includes an air box head 102; and an expansion valve further includes a retaining ring 42, which includes a main body 421 and a retaining part 422. The retaining ring is made of an elastic material, and there is a certain distance between the two retaining parts 422. After compression, the retaining ring 42 can be inserted into the retaining groove 411. After the retaining ring 42 is inserted into the retaining groove 411, the retaining ring 42... The retaining ring 42 is at least partially located in the groove 411, and at least partially located above the inner valve body, thereby restricting the inner valve body from axially disengaging from the outer valve body and achieving the limiting of the inner and outer valve bodies. Specifically, at least part of the main body 421 of the retaining ring 42 is located in the groove 411, and at least part of the retaining ring 42 is located above the gas box head 102. When the gas box head 102 is to be moved upward, it abuts against and limits the gas box head 102. The retaining part may also be provided with a through hole 423, which facilitates installation. The sealing method between the inner valve body and the outer valve body 400 can refer to the embodiment described above. In addition, a limiting structure is provided between the inner valve body and the outer valve body 400 to prevent relative rotation of the inner valve body, which can also refer to the above description, to prevent the inner valve body of the expansion valve from rotating in the circumferential direction when the air conditioning system is working.

[0046] See Figures 12-20 The expansion valve 500 of the fourth embodiment of the present invention includes an inner valve body 50 and an outer valve body 60. The inner valve body 50 includes a valve body 51, a power head assembly 52, a transmission rod assembly 53, a valve core assembly 54, and an adjustment assembly 55.

[0047] The valve body 51 has an opening at the top. The power head assembly 12 is welded to the valve body 11. The power head assembly 52 is located at the top of the valve body 51. The valve body 51 has an opening at the bottom. The adjusting assembly 55 is threadedly connected to the valve body 11. The adjusting assembly 55 is located near the bottom of the valve body 51. The inner valve body also includes a valve chamber 531. The valve core assembly 54 is located in the valve chamber 531. The valve core assembly 54 can change the flow area of ​​the expansion valve through the power head assembly 52 and the transmission rod assembly 53, thereby adjusting the flow rate of the fluid passing through the expansion valve. The transmission rod assembly 53... Located inside the inner valve body, the transmission rod component 53 is connected to the power head assembly 52 and the valve core assembly 54. The transmission rod component 53 can abut against the power head assembly 52, including direct and indirect abutment, and the transmission rod component 53 can abut against the valve core assembly 54, including direct and indirect abutment. The transmission rod component 53 can move accordingly when the power head assembly 52 is heated or cooled, thereby abutting and driving the valve core assembly 54 to move up and down, so that the valve core assembly 54 can move up and down a certain distance under the action of the power head assembly 52 to adjust the flow area of ​​the expansion valve.

[0048] The inner valve body 50 includes a valve body, which includes a first flow channel 501 and a second flow channel 502. The inner valve body 50 includes a throttling section with a throttling orifice located in the first flow channel. The valve body has a first inner interface 511, a second inner interface 512, a third inner interface 513, and a fourth inner interface 514. The first inner interface 511 is one interface of the first flow channel 501, the second inner interface 512 is another interface of the first flow channel 501, the third inner interface 513 is one interface of the second flow channel 502, and the fourth inner interface 514 is another interface of the second flow channel 502. In a specific application, fluid flows in through the first inner interface 511, is throttled by the valve orifice of the throttling section, flows out through the second inner interface 512 and then through the outer valve body. The fluid then flows in again through the outer valve body and through the third inner interface 513, and flows out through the fourth inner interface 514 and into the system. Of course, the second internal port 512 and the fourth internal port 514 can also be used as inlets, and the first internal port 511 and the third internal port 513 can also be used as outlets. Alternatively, the internal ports can be only the first internal port 511 and the second internal port 512, with fluid flowing in through the first internal port 511 and out through the second internal port 512. In this way, the size, shape, and interface type of the internal valve body can be standardized, reducing the specifications of products and testing fixtures during production and lowering management costs.

[0049] Reference Figure 14 , Figure 15 , Figure 16 The valve body 51 is generally rectangular and includes a first side 503, a second side 504, a third side 505, and a fourth side 506. The first side 503 and the third side 505 are arranged opposite to each other, and the second side 504 and the fourth side 506 are arranged opposite to each other. The first inner interface 511 and the fourth inner interface 514 are located on the first side 503, and the second inner interface 512 and the third inner interface 513 are located on the third side 505. The valve body 51 also includes a positioning groove 56. From the cross-section, the positioning groove 56 can be semi-circular. The positioning groove 56 includes a first positioning groove 561 and a second positioning groove 562. The first positioning groove 561 is located on the fourth side 506, and the second positioning groove 562 is located on the second side 504. In this embodiment, the first positioning groove 561 and the second positioning groove 562 penetrate the first side 503 and the third side 505.

[0050] Reference Figure 12 , Figure 17The outer valve body 60 includes a first outer valve body 61 and a second outer valve body 62. The first outer valve body includes a first interface portion 610 and a fourth interface portion 640. The second outer valve body includes a second interface portion 620 and a third interface portion 630. The first interface portion 610 includes a first outer interface 611 and a first interface 612. The second interface portion 620 includes a second outer interface 621 and a second interface 622. The third interface portion 630 includes a third outer interface 631 and a third interface 632. The fourth interface portion 640 includes a fourth outer interface 641 and a fourth interface 642. The first interface 612 is greater than or equal to the size of the first inner interface 511. The first interface 612 and the first inner interface 511 are matched in position and directly connected. The second interface 622 is greater than or equal to the size of the second inner interface 512. The size of the second interface 622 is matched with the position of the second inner interface 512 and directly connected. The size of the third interface 632 can be greater than or equal to the size of the third inner interface 513. The size of the third interface 632 is matched with the position of the third inner interface 513 and directly connected. The size of the fourth interface 642 can be greater than or equal to the size of the fourth inner interface 514. The size of the fourth interface 642 is matched with the position of the fourth inner interface 514 and connected. Of course, this may only include the first interface part 610 and the second interface part 620. The size of the first interface 612 and the first inner interface 512 can be the same. The first connection port 612 is matched with the first inner interface 511 and connected. The size of the second interface 622 and the second inner interface 512 can be the same. The second interface 622 is matched with the second inner interface 512 and connected. The first outer interface 611 of the first interface section, which is relatively close to the outer side, is larger than the first interface 612 of the first interface section, which is relatively close to the inner side of the inner valve body. The second outer interface 621 of the second interface section, which is relatively close to the outer side, is larger than the second interface 622 of the second interface section, which is relatively close to the inner side of the inner valve body. The third outer interface 631 of the third interface section, which is relatively close to the outer side, can be larger than or equal to the third interface 632 of the third interface section, which is relatively close to the inner side of the inner valve body. The fourth outer interface 641 of the fourth interface section, which is relatively close to the outer side, can be larger than or equal to the fourth interface 642 of the fourth interface section, which is relatively close to the inner side of the inner valve body. In this way, on the one hand, it can ensure that each interface has sufficient flow area within the allowable error range during the processing and assembly of the expansion valve, thereby reducing flow resistance. On the other hand, it does not affect the position of the sealing groove and the installation of internal components such as the butterfly spring, and can reduce the overall shape of the expansion valve.

[0051] Reference Figure 18 and Figure 19The inner valve body 50, the first outer valve body 61, and the second outer valve body 62 are fixed by bolts 57. The first outer valve body 61 includes a first mounting hole 613 and a second mounting hole 614. The second outer valve body 62 includes a third mounting hole 623 and a fourth mounting hole 624. The bolts 57 include a first bolt 571 and a second bolt 572. The first bolt 571 passes through the first mounting hole 613, the first positioning groove 561, and the third mounting hole 623. The second bolt 572 passes through the second mounting hole 614, the second positioning groove 562, and the fourth mounting hole 624. The three are fixed by nuts. Alternatively, the mounting hole of either the first outer valve body 61 or the second outer valve body 62 can be a threaded hole, which is threaded to engage with the bolt. The bolt passes through the other outer valve body and the inner valve body and is fixed to them by threads, thereby fixing the inner and outer valve bodies. Of course, the fixing method here is not limited to bolt fixing. In this embodiment, the first side portion 503 and the third side portion 505 of the inner valve body correspond to the side portion of the outer valve body, serving as positioning structures. The first side portion 503 of the inner valve body facing the first outer valve body mates with the side portion of the first outer valve body facing the inner valve body, and the third side portion 505 of the inner valve body facing the second outer valve body mates with the side portion of the second outer valve body facing the inner valve body. After assembly, the inner valve body cannot rotate relative to the outer valve body. Specifically, the first side portion 503 of the inner valve body in this embodiment includes a planar structure, and the side portion of the first outer valve body facing the inner valve body also includes a planar structure; the third side portion 505 of the inner valve body includes a planar structure, and the side portion of the second outer valve body facing the inner valve body also includes a planar structure; coupled with the engagement of bolts and two positioning grooves, the inner valve body and the outer valve body are effectively fixed. Correspondingly, due to the structural relationship between the inner and outer valve bodies, no additional positioning structures to prevent rotation are required. Alternatively, a recess can be provided in one or both of the two outer valve bodies so that the air box head of the power head component of the inner valve body is partially confined to the recess of the outer valve body for better positioning.

[0052] Specifically, the outer valve body includes a positioning portion, which includes a first positioning portion 581 and a second positioning portion 582. The first outer valve body 61 includes the first positioning portion 581, and the second outer valve body 62 includes the second positioning portion 582. The first outer valve body 61 includes a first positioning groove 591, and the second outer valve body 62 includes a second positioning groove 592. The first positioning groove 591 is located at the position of the first positioning portion 581, and the second positioning groove 592 is located at the position of the second positioning portion 582. The expansion valve has a cavity 58, which is formed by the first positioning portion 581 and the second positioning portion 582. The power head assembly 52 includes an air box head 521, with portions on both sides of the air box head 521 that can be accommodated in the cavity. The air box head 521 is at least partially located in the first positioning groove 591 and at least partially located in the second positioning groove 592. The air box head can be confined to the positioning portion and fixed by other fixing methods, or the air box head and the positioning portion can be fixed by welding. In this embodiment, the inner valve body 50 and the outer valve body 60 are fixedly connected by bolts, and the power head assembly 52 is welded and fixedly connected to the first outer valve body 61 and the second outer valve body 62. The first interface 612 corresponds to and is directly connected to the first inner interface 511, the second interface 622 corresponds to and is directly connected to the second inner interface 512, the third interface 632 corresponds to and is directly connected to the third inner interface 513, and the fourth interface 642 corresponds to and is directly connected to the fourth inner interface 514. One end of the first flow channel 501 is connected to the first interface 612, and the other end of the first flow channel 501 is connected to the second interface 622. The second flow channel 502 is connected to the third interface 632 and the fourth interface 642. Here, the inner valve body and the outer valve body are fixedly connected by bolts, and the power head assembly is welded and fixedly connected to the first outer valve body and the second outer valve body, which can realize the positioning and assembly of the inner valve body and the outer valve body.

[0053] Reference Figure 13 and Figure 17 , Figure 18The inner valve body has a first inner interface 511, a second inner interface 512, a third inner interface 513, and a fourth inner interface 514. Each inner interface has at least one sealing groove 515 on its periphery. The sealing groove 515 includes a first sealing groove 5151, a second sealing groove 5152, a third sealing groove 5153, and a fourth sealing groove 5154. The first sealing groove 5151 surrounds the outer periphery of the first inner interface 511, the second sealing groove 5152 surrounds the outer periphery of the second inner interface 512, the third sealing groove 5153 surrounds the outer periphery of the third inner interface 513, and the fourth sealing groove 5154 surrounds the outer periphery of the fourth inner interface 514. The expansion valve also includes a sealing groove corresponding to the sealing groove. The sealing ring 516 includes a first sealing ring 5161, a second sealing ring 5162, a third sealing ring 5163, and a fourth sealing ring 5164. The first sealing ring 5161 is at least partially located in the first sealing groove 5151, the second sealing ring 5162 is at least partially located in the second sealing groove 5152, the third sealing ring 5163 is at least partially located in the third sealing groove 5153, and the fourth sealing ring 5164 is at least partially located in the fourth sealing groove 5154. The inner valve body and the outer valve body achieve relative sealing through the sealing rings. These sealing rings can be rectangular, as they better prevent refrigerant leakage from the gap between the inner and outer valve body interfaces. Alternatively, they can be circular in cross-section. In this embodiment, the sealing groove is located in the inner valve body, but it can also be located in the outer valve body. For example, the first sealing groove may be in the first outer valve body and / or the fourth sealing groove may be in the first outer valve body, or the second sealing groove may be in the second outer valve body and / or the third sealing groove may be in the second outer valve body, achieving the same relative sealing.

[0054] The first external interface 611 is larger than the first internal interface 511, and the first sealing groove 5151 is arranged around the first internal interface 511. The second external interface 621 is larger than the second internal interface 512, and the second sealing groove 5152 is arranged around the second internal interface 511. The third external interface 631 can be greater than or equal to the third internal interface 513, and the third sealing groove 5153 is arranged around the third internal interface 513. The fourth external interface 641 can be greater than or equal to the fourth internal interface 514, and the fourth sealing groove 5154 is arranged around the fourth internal interface 514. This can reduce flow resistance, and even if the expansion valve has processing or assembly errors, the internal valve body interface still has sufficient flow area.

[0055] The expansion valve of the fifth embodiment of the present invention may further include a connecting pipe 60 for convenient connection to a system, such as... Figure 21The first outer valve body 61 includes a first connecting pipe 721 and a fourth connecting pipe 724. The second outer valve body 62 may further include a second connecting pipe 722 and a third connecting pipe 723. The first connecting pipe 721 and the first outer valve body 61 can be integrally formed or fixed together by welding. The fourth connecting pipe 724 and the first outer valve body 61 can also be integrally formed or fixed together by welding. Of course, the connection between the first connecting pipe 721, the fourth connecting pipe 724 and the first outer valve body 61 can also be in other ways, which are not limited here. The second connecting pipe 722 and the second outer valve body 62 can be integrally formed or fixed together by welding. The third connecting pipe 723 and the second outer valve body 62 can also be integrally formed or fixed together by welding, or they can be connected and fixed in other ways, which are not limited here. The first and second outer valve bodies can be individually matched with the pipeline. On the one hand, if the customer changes the external dimensions, only the interface dimensions of the first and / or second outer valve bodies need to be changed. This not only improves the adaptability of the product but also reduces the cost of changing the expansion valve. On the other hand, the first and second outer valve bodies can also be directly matched with the pipeline for easy connection.

[0056] See Figure 22 and Figure 23 This is a three-dimensional structural diagram of an expansion valve applied to a heat exchange device, and a schematic diagram of the first and second plates of the heat exchange device. The heat exchange device 700 includes a heat exchanger 70 and an expansion valve 10, the structure of which refers to the structure of the expansion valve in the above embodiment. The heat exchanger 70 includes a heat exchange core 71 and a cover plate 73. The heat exchange core 71 includes a plurality of stacked plates 74, including a first plate 741 and a second plate 742. The first plate 741 includes a first corner hole 751. The shape of the first plate 741 is approximately rectangular, and there are four first corner holes 751, which are located at opposite corners of the first plate 741. The second plate 742 has a structure that is roughly the same as or similar to that of the first plate 741. The second plate 742 includes a second corner hole 752. The first corner hole 751 and the second corner hole 752 are configured to cooperate with each other. The area between the first plate 741 and the second plate 742 is the fluid flow area of ​​the heat exchange core 71. The first plate 741 and the second plate 742 are stacked in sequence so that the heat exchange core 71 forms a first heat exchange channel 743 and a second heat exchange channel 744.

[0057] See Figure 24The expansion valve 10 includes an outer valve body 100. In this embodiment, the first external interface 1212 can be used as an inlet, which is connected to the first heat exchange channel 743 of the heat exchanger via the first flow channel 115 and the second external interface 1222. It exchanges heat with the working medium in the second heat exchange channel within the heat exchanger. In this embodiment, the fourth external interface 1242 can be used as an outlet. The first heat exchange channel 743 of the heat exchanger enters the second flow channel 117 through the third external interface 1232 and leaves the expansion valve through the fourth external interface 1242.

[0058] In practical applications, fluids such as refrigerant can flow in from the first external port 1212, through the first port 1211, the first internal port 111, the first flow channel 115, the valve port of the expansion valve, the second internal port 112, the second port 1221, and the second external port 1222 into the first heat exchange channel of the heat exchanger. Heat exchange occurs between the fluid in the heat exchanger and the fluid in the second heat exchange channel. The fluid then flows out from the heat exchanger through the third external port 1232, the third port 1231, the third internal port 113, the second flow channel 117, the fourth internal port 114, the fourth port 1241, and out through the fourth external port 1242.

[0059] The outer valve body of the expansion valve can be welded to the heat exchanger as a single unit, and then the inner valve body is assembled into the assembly of the outer valve body and the heat exchanger to form a heat exchange assembly. Alternatively, the expansion valve and the heat exchanger can be fixed together using bolts or other methods, which are not limited here. If the system has installation requirements regarding inlet and outlet dimensions and positions, only the structure or size of the outer valve body needs to be changed, while the inner valve body remains unchanged. This allows for the standardization of the inner valve body, reducing the number of parts and overall cost. The structure of the expansion valve can be referenced in the implementation method described above.

[0060] The heat exchanger may also include connecting pipes for connection, such as Figure 22 and Figure 25 The heat exchange assembly includes a first connecting pipe 761 and a second connecting pipe 762. One end of the first connecting pipe 761 is fixed to the side plate and / or heat exchange core of the heat exchanger by welding, and one end of the second connecting pipe 762 is fixed to the side plate and / or heat exchange core of the heat exchanger by welding. The first connecting pipe 761 is connected to the second heat exchange channel of the heat exchanger, and the second connecting pipe 762 is connected to the second heat exchange channel of the heat exchanger. The outer interface of the other end of the first connecting pipe 761 can serve as the second inlet 725 of the heat exchange assembly, and the outer interface of the other end of the second connecting pipe 762 can serve as the second outlet 726 of the heat exchange assembly. The second inlet 725 can serve as the inlet of the second heat exchange medium, and the second outlet 726 can serve as the outlet of the second heat exchange medium. The second heat exchange medium flows in from the second inlet, passes through the second heat exchange channel 744, exchanges heat with the fluid in the first heat exchange channel 743 in the heat exchanger, and flows out from the second outlet.

[0061] The heat exchange assembly may also include a cover plate 73, which includes a plurality of mounting holes 731, through which the heat exchange assembly can be fixedly connected to the system.

[0062] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the invention. For example, the directional definitions such as "front", "back", "left", "right", "up", and "down" are used. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify or make equivalent substitutions to the present invention. All technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. An expansion valve, comprising an inner valve body and an outer valve body, wherein the inner valve body and the outer valve body are fixedly or limitedly positioned; the inner valve body includes a valve body, a power head assembly, and a transmission rod assembly; the expansion valve further includes a valve core assembly and an adjusting assembly; the transmission rod assembly drivesly connects the power head assembly and the valve core assembly; the action of the power head assembly is applied to the valve core assembly through the transmission rod assembly; the outer valve body includes a first interface portion and a second interface portion, the first interface portion having a first interface, and the second interface portion having a second interface; the inner valve body has a first inner interface corresponding to and communicating with the first interface, and a second inner interface corresponding to and communicating with the second interface; the expansion valve is provided with at least two sealing rings between the inner valve body and the outer valve body, and corresponding sealing grooves are provided in the inner valve body and / or the outer valve body, with at least a portion of the sealing rings located in the corresponding sealing grooves; in the axial height direction of the expansion valve, at least one sealing ring is higher than the first inner interface and lower than the second inner interface, or at least one sealing ring is arranged around the first inner interface and / or at least one sealing ring is arranged around the second inner interface; The outer valve body includes a third interface portion and a fourth interface portion, the third interface portion having a third interface and the fourth interface portion having a fourth interface; the inner valve body has a third inner interface corresponding to and communicating with the third interface and a fourth inner interface corresponding to and communicating with the fourth interface.

2. The expansion valve as described in claim 1, characterized in that: The expansion valve is provided with at least three sealing rings between the inner valve body and the outer valve body: at least one sealing ring is higher than the first inner interface and lower than the second inner interface; at least one sealing ring is higher than the second inner interface and lower than the third or fourth inner interface; at least one sealing ring is higher than the third or fourth inner interface.

3. The expansion valve as described in claim 1, characterized in that: The expansion valve is provided with at least four sealing rings between the inner valve body and the outer valve body: at least one sealing ring is provided around the first inner interface, at least one sealing ring is provided around the second inner interface, at least one sealing ring is provided around the third inner interface, and at least one sealing ring is provided around the fourth inner interface.

4. The expansion valve as described in claim 1, characterized in that: The expansion valve is equipped with a positioning structure to prevent the inner valve body from rotating relative to the outer valve body. The valve body includes a valve body part, a valve body part two, and a valve body part three. In terms of height, the valve body part three is lower than the valve body part two, and the valve body part two is lower than the valve body part one. The maximum point of the valve body part three is smaller than the maximum point of the valve body part two, and the maximum point of the valve body part two is smaller than the maximum point of the valve body part one. The first inner interface is located in the valve body part three, and the second inner interface is located in the valve body part two. The first interface is greater than or equal to the first inner interface, and the second interface is greater than or equal to the second inner interface.

5. The expansion valve as described in claim 2, characterized in that: The expansion valve is equipped with a positioning structure to prevent the inner valve body from rotating relative to the outer valve body. The valve body includes a valve body part, a valve body part two, and a valve body part three. In terms of height, the valve body part three is lower than the valve body part two, and the valve body part two is lower than the valve body part one. The maximum point of the valve body part three is smaller than the maximum point of the valve body part two, and the maximum point of the valve body part two is smaller than the maximum point of the valve body part one. The first inner interface is located in the valve body part three, and the second inner interface is located in the valve body part two. The first interface is greater than or equal to the first inner interface, and the second interface is greater than or equal to the second inner interface.

6. The expansion valve as described in claim 3, characterized in that: The expansion valve is equipped with a positioning structure to prevent the inner valve body from rotating relative to the outer valve body. The valve body includes a valve body part, a valve body part two, and a valve body part three. In terms of height, the valve body part three is lower than the valve body part two, and the valve body part two is lower than the valve body part one. The maximum point of the valve body part three is smaller than the maximum point of the valve body part two, and the maximum point of the valve body part two is smaller than the maximum point of the valve body part one. The first inner interface is located in the valve body part three, and the second inner interface is located in the valve body part two. The first interface is greater than or equal to the first inner interface, and the second interface is greater than or equal to the second inner interface.

7. The expansion valve as described in claim 4, characterized in that: The third inner interface and the fourth inner interface are disposed on a portion of the valve body, and the third inner interface and the fourth inner interface are connected; the inner valve body is provided with a first sealing groove, a second sealing groove, and a third sealing groove, and the expansion valve includes a first sealing ring, a second sealing ring, and a third sealing ring, wherein the first sealing ring is at least partially located in the first sealing groove, the second sealing ring is at least partially located in the second sealing groove, and the third sealing ring is at least partially located in the third sealing groove; in the height direction, the first sealing groove is located above the third inner interface and the fourth inner interface, the second sealing groove is located below the third inner interface and the fourth inner interface, the second sealing groove is located above the second inner interface, the third sealing groove is located below the second inner interface, and the third sealing groove is located above the first inner interface.

8. The expansion valve as described in claim 5, characterized in that: The third inner interface and the fourth inner interface are disposed on a portion of the valve body, and the third inner interface and the fourth inner interface are connected; the inner valve body is provided with a first sealing groove, a second sealing groove, and a third sealing groove, and the expansion valve includes a first sealing ring, a second sealing ring, and a third sealing ring, wherein the first sealing ring is at least partially located in the first sealing groove, the second sealing ring is at least partially located in the second sealing groove, and the third sealing ring is at least partially located in the third sealing groove; in the height direction, the first sealing groove is located above the third inner interface and the fourth inner interface, the second sealing groove is located below the third inner interface and the fourth inner interface, the second sealing groove is located above the second inner interface, the third sealing groove is located below the second inner interface, and the third sealing groove is located above the first inner interface.

9. The expansion valve as described in claim 6, characterized in that: The third inner interface and the fourth inner interface are disposed on a portion of the valve body, and the third inner interface and the fourth inner interface are connected; the inner valve body is provided with a first sealing groove, a second sealing groove, and a third sealing groove, and the expansion valve includes a first sealing ring, a second sealing ring, and a third sealing ring, wherein the first sealing ring is at least partially located in the first sealing groove, the second sealing ring is at least partially located in the second sealing groove, and the third sealing ring is at least partially located in the third sealing groove; in the height direction, the first sealing groove is located above the third inner interface and the fourth inner interface, the second sealing groove is located below the third inner interface and the fourth inner interface, the second sealing groove is located above the second inner interface, the third sealing groove is located below the second inner interface, and the third sealing groove is located above the first inner interface.

10. The expansion valve according to any one of claims 1 to 9, characterized in that: The expansion valve is provided with a positioning structure, which includes a protrusion provided on the outer valve body and a recess or notch provided on the inner valve body; or, the positioning structure includes a recess or notch provided on the outer valve body and a protrusion provided on the inner valve body. The first interface is greater than or equal to the first inner interface, and the second interface is greater than or equal to the second inner interface; the outer portion of the first interface facing outward is greater than or equal to the inner portion of the first interface near the inner valve body, and the outer portion of the second interface facing outward is greater than or equal to the inner portion of the second interface near the inner valve body. Alternatively, the inner valve body includes a positioning part, the positioning part includes a positioning notch, the positioning notch includes a first contact surface, the first contact surface is a plane, the outer valve body includes a mating positioning part, the mating positioning part is located on the inner wall surface of the outer valve body, the mating positioning part includes a second contact surface, the second contact surface is a plane, and when the mating positioning part and the positioning notch are mated, the first contact surface abuts against the second contact surface.

11. The expansion valve as described in claim 10, characterized in that: The outer valve body also includes a limiting part, which includes a groove. The power head assembly includes an air box head. The expansion valve includes a retaining ring, which is made of an elastic material. The retaining ring includes a main body and a snap-fit ​​part. The retaining ring can be inserted into the groove after compression. When the retaining ring is inserted into the groove, it springs open. At least a portion of the main body of the retaining ring is located in the groove, and at least a portion of the retaining ring is located above the air box head, abutting and limiting the air box head. The snap-fit ​​part has a through hole, and the retaining ring is made of aluminum.

12. A heat exchange device, characterized in that: The heat exchange device includes the expansion valve according to any one of claims 1-11, and the heat exchange device further includes a heat exchanger, the heat exchanger includes a heat exchange core, the heat exchange core includes plates, the plates include a first plate and a second plate, the heat exchange core includes the first plate and the second plate stacked together, the first plate has a first corner hole located at the opposite corner of the first plate, the second plate has a second corner hole, the first corner hole and the second corner hole are configured to cooperate, the area between the first plate and the second plate is the fluid flow area of ​​the heat exchange core, the first plate and the second plate are stacked sequentially, so that the heat exchange core forms a non-communicating first heat exchange channel and a second heat exchange channel.

13. The heat exchange device as described in claim 12, characterized in that: The outer valve body and the heat exchange core are fixedly connected. The expansion valve is connected to the first heat exchange channel and the second heat exchange channel. The heat exchange device has a first inlet and a first outlet. The first interface part also has a first external interface. The fourth interface part also has a fourth external interface. The first external interface serves as the first inlet, and the fourth external interface serves as the first outlet. The first inlet serves as the inlet of the first heat exchange medium of the heat exchange device, and the first outlet serves as the outlet of the first heat exchange medium of the heat exchange device.

14. The heat exchange device as described in claim 13, characterized in that: The heat exchanger further includes a first connecting pipe and a second connecting pipe. One end of the first connecting pipe is fixed to the side plate and / or heat exchange core of the heat exchanger by welding, and one end of the second connecting pipe is fixed to the side plate and / or heat exchange core of the heat exchanger by welding. The first connecting pipe is connected to the second heat exchange channel of the heat exchanger, and the second connecting pipe is connected to the second heat exchange channel of the heat exchanger. The other end of the first connecting pipe has a second inlet, and the other end of the second connecting pipe has a second outlet. The second inlet serves as the inlet of the second heat exchange medium of the heat exchange device, and the second outlet serves as the outlet of the second heat exchange medium of the heat exchange device.

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