Double-pipe heat exchanger and temperature control equipment

Abstract

The utility model discloses a double-pipe heat exchanger and temperature control equipment, and belongs to the technical field of heat exchangers, the double-pipe heat exchanger comprises an inner pipe, an outer pipe and a connecting assembly, and a first flow channel is arranged in the inner pipe; the outer pipe is arranged outside the inner pipe in a sleeving mode, and a second flow channel is formed by the inner wall face of the outer pipe and the outer wall face of the inner pipe; the connecting assembly comprises a three-way connector and a fixing ring sleeve, the three-way connector comprises a liquid inlet and outlet end, a first connecting end and a second connecting end, the inner pipe penetrates through the first connecting end and the second connecting end, the first connecting end is connected with the end of the outer pipe, the second connecting end is connected with the outer wall face of the inner pipe, and the outer wall face of the inner pipe is sleeved with the fixing ring sleeve. The outer wall face of the fixing ring sleeve is opposite to the liquid inlet and outlet end, a third flow channel communicated with the second flow channel is formed between the outer wall face of the fixing ring sleeve and the inner wall face of the three-way connector, and the risk of fluid leakage and the risk of excessive deformation of the inner pipe can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to a shell and tube heat exchanger and a temperature control device. Background Art

[0002] Shell-and-tube heat exchangers are widely used in equipment such as hot and cold water heaters, air conditioners, and boilers to enable heat exchange between the fluid in the inner tube and the fluid between the inner tube and the outer tube.

[0003] In the related art, when the refrigerant or the heat medium is passed into the flow channel between the inner tube and the outer tube, the high pressure of the refrigerant or the heat medium may easily lead to leakage and damage to the inner tube. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a shell-and-tube heat exchanger that is conducive to reducing the risk of fluid leakage and the risk of excessive deformation of the inner tube.

[0005] The utility model also provides a temperature control device.

[0006] The shell and tube heat exchanger according to the embodiment of the first aspect of the present invention includes: an inner tube, which is provided with a first flow channel; an outer tube, which is sleeved on the outside of the inner tube, and a second flow channel is constructed between the inner wall surface of the outer tube and the outer wall surface of the inner tube; a connecting assembly includes a tee joint and a fixed ring sleeve, the tee joint includes an inlet and outlet liquid end, a first connecting end and a second connecting end, the inner tube is passed through the first connecting end and the second connecting end, the first connecting end is connected to the end of the outer tube, and the second connecting end is connected to the outer wall surface of the inner tube, the fixed ring sleeve is sleeved on the outer wall surface of the inner tube, the outer wall surface of the fixed ring sleeve is opposite to the inlet and outlet liquid end, and a third flow channel connected to the second flow channel is constructed between the outer wall surface of the fixed ring sleeve and the inner wall surface of the tee joint.

[0007] The shell and tube heat exchanger according to the embodiment of the present invention has at least the following beneficial effects: the connection assembly includes a tee joint and a fixed ring sleeve, wherein the tee joint includes a liquid inlet and outlet end, a first connection end and a second connection end that are connected, wherein the inner tube is passed through the first connection end and the second connection end, that is, the tee joint is sleeved on the outside of the inner tube, the first connection end is connected to the end of the outer tube, that is, the tee joint is connected to the end of the outer tube, and the second connection end is connected to the outer wall of the inner tube to limit the liquid from flowing out of the tee joint from the second connection end, the fixed ring sleeve is sleeved on the outer wall of the inner tube, and the outer wall of the fixed ring sleeve is opposite to the liquid inlet and outlet end of the tee joint, and the fixed ring sleeve is sleeved on the outer wall of the inner tube, and the outer wall of the fixed ring sleeve is opposite to the liquid inlet and outlet end of the tee joint, and the fixed ring sleeve is sleeved on the outer wall of the inner tube. A third flow channel connected to the second flow channel is constructed between the outer wall surface of the sleeve and the inner wall surface of the tee joint. For example, the refrigerant can enter the tee joint from the liquid inlet and outlet ends, and the refrigerant can flow through the third flow channel and the second flow channel, and the water can flow through the first flow channel, thereby realizing heat exchange between the water and the refrigerant. The shell and tube heat exchanger is connected to the inner tube and the outer tube through the tee joint, which is conducive to improving the airtightness of the shell and tube heat exchanger and reducing the risk of fluid leakage. The outer wall surface of the fixed ring sleeve is arranged opposite to the liquid inlet and outlet ends. The fixed ring sleeve can effectively withstand the impact of the fluid introduced from the liquid inlet and outlet ends, thereby reducing the risk of excessive deformation of the outer wall surface of the inner tube due to excessive pressure.

[0008] According to some embodiments of the present invention, the first connecting end and the second connecting end are arranged in a straight line, and the inner diameter of the second connecting end is smaller than the inner diameter of the first connecting end; and / or,

[0009] The first connecting end is sleeved on the outer wall surface of the outer tube.

[0010] Optionally, the first connecting end and the second connecting end are arranged in a straight line, so that the inner tube can pass through the tee joint in a straight line to reduce unnecessary bending of the inner tube, so that the fixing ring sleeve is easier to be sleeved on the inner tube and positioned with the tee joint, and the inner diameter of the second connecting end is smaller than the inner diameter of the first connecting end, so that the second connecting end can fit tightly with the outer wall surface of the inner tube, so that the inner tube closes the second connecting end, and the fluid flowing in from the inlet and outlet ends can only pass into the second flow channel from the first connecting end after passing through the third flow channel, thereby realizing control of the flow direction of the fluid; optionally, the first connecting end is sleeved on the outer wall surface of the outer tube, that is, the tee joint is connected to the end of the outer tube, and a stable connection between the tee joint and the outer tube is realized.

[0011] According to some embodiments of the present invention, the connection assembly includes two tee joints, and the two ends of the outer tube are respectively provided with a tee joint.

[0012] Specifically, the connecting assembly includes two tee joints, and tee joints are respectively provided at both ends of the outer tube. That is, the shell and tube heat exchanger is respectively provided with tee joints at the inlet and outlet ends of the outer tube, which is conducive to improving the airtightness of the shell and tube heat exchanger and reducing the risk of fluid leakage.

[0013] According to some embodiments of the present invention, a spiral groove is provided on the outer wall of the inner tube.

[0014] It is understandable that a spiral groove is provided on the outer wall of the inner tube. When the fluid flows in the first flow channel and the second flow channel, it is guided by the spiral groove, so that part of the fluid close to the wall of the inner tube rotates and flows along the spiral groove, and the other part of the fluid flows along the axial direction of the inner tube or the outer tube, which is beneficial to thinning the boundary layer of the fluid and can also cause disturbance of the fluid in the boundary layer, thereby accelerating the heat transfer between the two fluids, which can significantly improve the heat exchange efficiency of the shell and tube heat exchanger and is beneficial to improving the heat transfer coefficient of the shell and tube heat exchanger.

[0015] According to some embodiments of the present invention, the inner tube is formed by a corrugated tube knob; and / or,

[0016] The second connecting end is welded to the outer wall of the inner tube; and / or,

[0017] The number of spiral grooves is 6 or 8.

[0018] Optionally, the inner tube is made of a corrugated tube knob, that is, the surface of the inner tube has a concave-convex surface structure, which can enhance the disturbance and mixing of the fluid inside and outside the tube, further improve the heat exchange efficiency, and cooperate with the spiral groove to guide the rotation of the fluid, further intensify the disturbance and rotation of the fluid, so that the boundary layer thickness is thinner and the heat transfer rate is accelerated; optionally, the second connecting end is welded to the outer wall of the inner tube so that the second connecting end fits tightly with the outer wall of the inner tube, so that the inner tube closes the second connecting end, and the liquid flowing in from the inlet and outlet ends can only pass into the second flow channel from the first connecting end after passing through the third flow channel, thereby realizing the flow direction control of the fluid; optionally, 6 or 8 spiral grooves are set, that is, the inner tube is a 6-head spiral tube or an 8-head spiral tube, and the inner tube is controlled by the number of spiral grooves, thereby controlling the disturbance and rotation of the fluid passing through the inner tube, so as to improve the heat exchange efficiency of the shell and tube heat exchanger.

[0019] According to some embodiments of the present invention, the inner tube, the outer tube and the connecting assembly together constitute a heat exchange assembly, and two heat exchange assemblies are provided.

[0020] Specifically, the shell and tube heat exchanger is provided with two heat exchange components, namely, two sets of inner tubes, outer tubes and connecting components, so as to improve the carrying capacity of the shell and tube heat exchanger and achieve heating or cooling of a fluid with a larger flow rate per unit time.

[0021] The temperature control device according to the embodiment of the second aspect of the present invention includes the shell and tube heat exchanger shown in any one of the first aspects.

[0022] The temperature control device according to the embodiment of the present invention has at least the following beneficial effects: the temperature control device includes a shell-and-tube heat exchanger as shown in any one of the first aspects, the connection assembly includes a tee joint and a fixed ring sleeve, wherein the tee joint includes a liquid inlet and outlet end, a first connection end and a second connection end that are connected, wherein the inner tube is passed through the first connection end and the second connection end, that is, the tee joint is sleeved on the outside of the inner tube, the first connection end is connected to the end of the outer tube, that is, the tee joint is connected to the end of the outer tube, and the second connection end is connected to the outer wall surface of the inner tube to limit the liquid from flowing out of the tee joint from the second connection end, the fixed ring sleeve is sleeved on the outer wall surface of the inner tube, and the outer wall surface of the fixed ring sleeve is connected to the tee joint. The liquid inlet and outlet ends of the head are opposite to each other, and a third flow channel connected to the second flow channel is constructed between the outer wall of the fixed ring sleeve and the inner wall of the tee joint. For example, the refrigerant can pass into the tee joint from the liquid inlet and outlet ends, and the refrigerant flows through the third flow channel and the second flow channel, and the water flow can flow through the first flow channel, thereby realizing heat exchange between the water flow and the refrigerant. The shell and tube heat exchanger is connected to the inner tube and the outer tube through the tee joint, which is conducive to improving the airtightness of the shell and tube heat exchanger and reducing the risk of fluid leakage. The outer wall of the fixed ring sleeve is arranged relative to the liquid inlet and outlet ends. The fixed ring sleeve can effectively withstand the impact of the fluid passed through the liquid inlet and outlet ends, thereby reducing the risk of excessive deformation of the outer wall of the inner tube due to excessive pressure.

[0023] According to some embodiments of the present invention, the temperature control device further includes a compressor and an evaporator, and the compressor, the shell-and-tube heat exchanger, and the evaporator are connected in sequence to jointly constitute a main flow path.

[0024] Specifically, the temperature control equipment also includes a compressor and an evaporator. The compressor, the shell and tube heat exchanger and the evaporator are connected in sequence to form a main flow path. The compressor can output high-temperature and high-pressure refrigerant, and the refrigerant is in a gaseous state. In the shell and tube heat exchanger, the temperature of the refrigerant is reduced by heat exchange with the heat carrier, and the refrigerant is converted into liquid. The liquid refrigerant evaporates at the evaporator, and cooperates with the external fan to transfer the cold energy emitted by the evaporated refrigerant to the outside.

[0025] According to some embodiments of the present invention, the temperature control device also includes an economizer connected between the shell and tube heat exchanger and the evaporator, and a first branch connected in parallel with the economizer. The first branch includes a first control valve, and a first capillary tube and a first one-way valve connected in sequence. The inlet end of the first capillary tube is connected to the port of the shell and tube heat exchanger, and the outlet of the first one-way valve is connected to the port of the evaporator. The first control valve is used to control the on-off of the first branch and the main flow.

[0026] Specifically, the temperature control device also includes an economizer connected between the shell and tube heat exchanger and the evaporator, and a first branch connected in parallel with the economizer. The economizer is connected to the main flow path. The first branch can be a refrigeration auxiliary path. When the temperature control device is cooling, the first control valve is used to control the connection between the first branch and the main flow path. The first branch can divert part of the refrigerant so that the diverted refrigerant passes through the first capillary tube and the first one-way valve in turn, which is beneficial to reducing the amount of refrigerant flowing through the economizer, thereby reducing the dissipation of cold energy at the economizer, and helping to improve the economic benefits of the shell and tube heat exchanger.

[0027] According to some embodiments of the present invention, the temperature control device also includes a second branch connected in parallel between the shell and tube heat exchanger and the evaporator, the second branch includes a second control valve, and a first pressure relief valve, a second capillary tube and a second one-way valve connected in sequence, the inlet end of the second one-way valve is connected to the port of the evaporator, the outlet end of the first pressure relief valve is connected to the port of the shell and tube heat exchanger, and the second control valve is used to control the opening and closing of the second branch and the main flow.

[0028] The temperature control device also includes a second branch connected in parallel between the shell and tube heat exchanger and the evaporator. The second branch can be a heating auxiliary circuit. When the shell and tube heat exchanger is heating, the second control valve is used to control the connection between the second branch and the main circuit. The second branch can divert part of the heat medium, so that the diverted heat medium passes through the second one-way valve, the second capillary tube and the first pressure relief valve in sequence, and is pressure-relieved by the first pressure relief valve to reduce the pressure of the heat medium, thereby further increasing the water temperature.

[0029] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0031] Figure 1 This is a schematic structural diagram of a double-tube heat exchanger according to an embodiment of the present invention;

[0032] Figure 2 This is a structural schematic diagram of a double-tube heat exchanger according to an embodiment of the present invention from another perspective;

[0033] Figure 3 This is a partial structural diagram of a connection assembly of a shell-and-tube heat exchanger according to an embodiment of the present utility model;

[0034] Figure 4 This is a structural diagram of a temperature control device according to an embodiment of the present invention.

[0035] Figure Number:

[0036] 100, inner tube;

[0037] 200, foreign control;

[0038] 300, connecting assembly; 310, tee connector; 311, liquid inlet and outlet; 312, first connecting end; 313, second connecting end; 320, fixing ring; 330, third flow channel;

[0039] 410. Compressor; 420. Evaporator;

[0040] 510. First capillary tube; 520. First one-way valve;

[0041] 610, first pressure relief valve; 620, second capillary tube; 630, second one-way valve;

[0042] 710, four-way valve; 720, liquid reservoir; 730, needle valve; 740, filter; 750, economizer; 760, first electronic expansion valve; 770, second electronic expansion valve. DETAILED DESCRIPTION

[0043] The following describes in detail embodiments of the present invention. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0044] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientation or positional relationship indicated by up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0045] In the description of this utility model, "a plurality" means more than two. The use of "first" or "second" is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or implicitly indicating the order of the technical features indicated.

[0046] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0047] Reference Figures 1 to 3 As shown, a shell-and-tube heat exchanger according to an embodiment of the present invention includes an inner tube 100 , an outer tube 200 and a connecting assembly 300 .

[0048] Reference Figure 1 、 Figure 2 and Figure 3 As shown, a first flow channel is provided in the inner tube 100 , the outer tube 200 is sleeved on the outside of the inner tube 100 , and a second flow channel is constructed between the inner wall surface of the outer tube 200 and the outer wall surface of the inner tube 100 .

[0049] The outer wall of the inner tube 100 is provided with a spiral groove, that is, the inner tube 100 is a spiral tube. When the fluid flows in the first flow channel, the fluid is guided by the spiral groove, so that part of the fluid close to the wall of the inner tube 100 rotates and flows along the spiral groove, and the other part of the fluid flows along the axial direction of the inner tube 100, which is beneficial to thinning the boundary layer of the fluid and can also cause disturbance of the fluid in the boundary layer, thereby accelerating the heat transfer between the two fluids, which can significantly improve the heat exchange efficiency of the shell and tube heat exchanger and is beneficial to improving the heat transfer coefficient of the shell and tube heat exchanger.

[0050] Reference Figure 1 、 Figure 2 and Figure 3 As shown, the connecting assembly 300 includes a three-way joint 310 and a fixed ring sleeve 320, and the three-way joint 310 includes a communicating liquid inlet and outlet end 311, a first connecting end 312 and a second connecting end 313, wherein the inner tube 100 is passed through the first connecting end 312 and the second connecting end 313, that is, the three-way joint 310 is sleeved on the outside of the inner tube 100.

[0051] Reference Figure 1 、 Figure 2 and Figure 3 As shown, the first connecting end 312 is connected to the end of the outer tube 200, that is, the tee joint 310 is connected to the end of the outer tube 200, and the second connecting end 313 is connected to the outer wall of the inner tube 100 to limit the liquid from flowing out of the tee joint 310 from the second connecting end 313.

[0052] Reference Figure 1 、 Figure 2 and Figure 3 As shown, a fixed ring 320 is sleeved on the outer wall of the inner tube 100. The outer wall of the fixed ring 320 is opposite to the liquid inlet and outlet 311. A third flow channel 330 is constructed between the outer wall of the fixed ring 320 and the inner wall of the tee joint 310, which is connected to the second flow channel. For example, refrigerant can be introduced into the tee joint 310 from the liquid inlet and outlet 311, and the refrigerant can flow through the third flow channel 330 and the second flow channel, and water can flow through the first flow channel, thereby achieving heat exchange between the water and the refrigerant.

[0053] Reference Figure 1 、 Figure 2 and Figure 3As shown, compared with the connection structure with the second flow channel through a separate joint, the shell and tube heat exchanger provided in the embodiment of the present invention adopts a three-way joint 310 to be connected with the inner tube 100 and the outer tube 200, which is beneficial to improving the airtightness of the shell and tube heat exchanger and reducing the risk of fluid leakage.

[0054] Reference Figure 1 、 Figure 2 and Figure 3 As shown, the outer wall of the fixed ring 320 is arranged opposite to the liquid inlet and outlet ends 311. The fixed ring 320 can effectively withstand the impact of the fluid entering from the liquid inlet and outlet ends 311, thereby reducing the risk of excessive deformation caused by excessive pressure on the outer wall of the inner tube 100.

[0055] Reference Figure 1 、 Figure 2 and Figure 3 As shown, it can be understood that the first connecting end 312 and the second connecting end 313 are arranged in a straight line, and the inner diameter of the second connecting end 313 is smaller than the inner diameter of the first connecting end 312, so that the inner tube 100 can pass through the tee joint 310 in a straight line to reduce unnecessary bending of the inner tube 100, so that the fixing ring sleeve 320 is easier to connect with the inner tube 100 and position it with the tee joint 310.

[0056] The inner diameter of the second connection end 313 is smaller than the inner diameter of the first connection end 312, so that the second connection end 313 can fit tightly with the outer wall of the inner tube 100, so that the inner tube 100 closes the second connection end 313, and the liquid flowing in from the liquid inlet and outlet end 311 can only enter the second flow channel from the first connection end 312 after passing through the third flow channel 330, thereby realizing the flow direction control of the fluid.

[0057] Reference Figure 1 、 Figure 2 and Figure 3 As shown, the first connection end 312 is sleeved on the outer wall surface of the outer tube 200, that is, the tee joint 310 is connected to the end of the outer tube 200, and a stable connection between the tee joint 310 and the outer tube 200 is achieved, and the first connection end 312 is welded to the outer wall surface of the outer tube 200. Through the welding processing method, the tee joint 310 and the outer wall surface of the outer tube 200 are tightly fitted and connected, so as to improve the airtightness of the shell and tube heat exchanger and reduce the risk of fluid leakage.

[0058] Reference Figure 1 、 Figure 2 and Figure 3As shown, specifically, the second connecting end 313 is welded to the outer wall of the inner tube 100 so that the second connecting end 313 fits tightly with the outer wall of the inner tube 100, so that the inner tube 100 closes the second connecting end 313, and the liquid flowing in from the liquid inlet and outlet end 311 passes through the third flow channel 330 and can only enter the second flow channel from the first connecting end 312, thereby realizing the flow direction control of the fluid.

[0059] Reference Figure 1 、 Figure 2 and Figure 3 As shown, it can be understood that the inner tube 100 is formed by a corrugated tube knob, that is, the outer surface and the inner surface of the inner tube 100 have a concave-convex surface structure, which can enhance the disturbance and mixing of the fluid inside and outside the tube, further improve the heat exchange efficiency, and cooperate with the spiral groove to guide the rotation of the fluid, further intensify the disturbance and rotation of the fluid, so that the boundary layer thickness is thinned, the heat transfer rate is accelerated, and the energy efficiency of the shell and tube heat exchanger is improved.

[0060] Reference Figure 1 、 Figure 2 and Figure 3 As shown, eight spiral grooves are provided, that is, the inner tube 100 is an eight-head spiral tube. The inner tube 100 is controlled by the number of spiral grooves, thereby controlling the disturbance and rotation of the fluid passing through the inner tube 100 to improve the heat exchange efficiency of the shell-and-tube heat exchanger.

[0061] It should be understood that in some other embodiments, the number of spiral grooves is 5, 6, 7, etc., that is, the inner tube 100 is a 5-head spiral tube, a 6-head spiral tube or a 7-head spiral tube, and the inner tube 100 is controlled by the number of spiral grooves, thereby controlling the disturbance and rotation of the fluid passing through the inner tube 100 to improve the heat exchange efficiency of the shell-and-tube heat exchanger.

[0062] Reference Figure 1 、 Figure 2 and Figure 3 As shown, it can be understood that in this embodiment, specifically, the connecting assembly 300 includes two tee joints 310, and the two ends of the outer tube 200 are respectively provided with tee joints 310, that is, the inlet end and the outlet end of the outer tube 200 of the shell and tube heat exchanger are respectively provided with tee joints 310, which is conducive to improving the airtightness of the shell and tube heat exchanger and reducing the risk of fluid leakage.

[0063] It should be understood that, in some other embodiments, the connection assembly 300 includes two fixing rings 320 , and the fixing rings 320 correspond to the three-way connectors 310 on a one-to-one basis.

[0064] Reference Figure 1 、 Figure 2 and Figure 3As shown, it can be understood that in this embodiment, the shell and tube heat exchanger is provided with two heat exchange components, that is, two sets of inner tubes 100, outer tubes 200 and connecting components 300 are provided to improve the carrying capacity of the shell and tube heat exchanger and achieve heating or cooling of a fluid with a larger flow rate per unit time.

[0065] Reference Figure 1 、 Figure 3 and Figure 4 As shown, a temperature control device provided by an embodiment of the present invention includes: a compressor 410, a shell and tube heat exchanger as shown in any of the above embodiments, and an evaporator 420. The compressor 410, the shell and tube heat exchanger, and the evaporator 420 are connected in sequence to form a main flow path.

[0066] Reference Figure 1 、 Figure 3 and Figure 4 As shown, the connection assembly 300 includes a tee joint 310 and a fixed ring sleeve 320, wherein the tee joint 310 includes a communicating liquid inlet and outlet end 311, a first connecting end 312 and a second connecting end 313, wherein the inner tube 100 is passed through the first connecting end 312 and the second connecting end 313, that is, the tee joint 310 is sleeved on the outside of the inner tube 100, the first connecting end 312 is connected to the end of the outer tube 200, that is, the tee joint 310 is connected to the end of the outer tube 200, and the second connecting end 313 is connected to the outer wall of the inner tube 100 to limit the liquid from flowing out of the tee joint 310 from the second connecting end 313.

[0067] Reference Figure 1 、 Figure 3 and Figure 4 As shown, the fixed ring 320 is sleeved on the outer wall of the inner tube 100, and the outer wall of the fixed ring 320 is opposite to the liquid inlet and outlet ends 311 of the three-way joint 310. A third flow channel 330 connected to the second flow channel is constructed between the outer wall of the fixed ring 320 and the inner wall of the three-way joint 310. For example, the refrigerant can be introduced into the three-way joint 310 from the liquid inlet and outlet ends 311, and the refrigerant flows through the third flow channel 330 and the second flow channel, and the water flow can flow through the first flow channel, thereby To achieve heat exchange between water flow and refrigerant, the shell and tube heat exchanger is connected to the inner tube 100 and the outer tube 200 through the three-way joint 310, which is conducive to improving the airtightness of the shell and tube heat exchanger and reducing the risk of fluid leakage. The outer wall surface of the fixed ring sleeve 320 is arranged opposite to the liquid inlet and outlet ends 311. The fixed ring sleeve 320 can effectively withstand the impact of the fluid entering from the liquid inlet and outlet ends 311, thereby reducing the risk of excessive deformation caused by excessive pressure on the outer wall surface of the inner tube 100.

[0068] Reference Figure 1 、 Figure 3 and Figure 4As shown, the compressor 410 can output high-temperature and high-pressure refrigerant, and the output refrigerant is in a gaseous state. In the shell-and-tube heat exchanger, the temperature of the refrigerant is reduced by heat exchange with the heat-carrying medium, and the refrigerant is converted into a liquid state. The liquid refrigerant evaporates at the evaporator 420, and in conjunction with an external fan, the cooling energy emitted by the evaporated refrigerant can be transferred to the outside.

[0069] Reference Figure 1 、 Figure 3 and Figure 4 As shown, it is understood that the temperature control device also includes a four-way valve 710, a liquid reservoir 720, a filter 740, a first electronic expansion valve 760, a second electronic expansion valve 770, and an economizer 750 connected between the shell-and-tube heat exchanger and the evaporator 420. The four-way valve 710, the liquid reservoir 720, the filter 740, the second electronic expansion valve 770, and the economizer 750 are all connected to the main flow path. A needle valve 730 is connected to the liquid reservoir 720.

[0070] Reference Figure 1 、 Figure 3 and Figure 4 As shown, the four-way valve 710 is connected between the compressor 410 and the shell and tube heat exchanger, the liquid reservoir 720, the filter 740, the economizer 750 and the second electronic expansion valve 770 are connected in sequence, the liquid reservoir 720 is connected to the port of the shell and tube heat exchanger, and the second electronic expansion valve 770 is connected to the evaporator 420.

[0071] Reference Figure 1 、 Figure 3 and Figure 4 As shown, economizer 750 has a first heat exchange channel and a second heat exchange channel arranged in parallel, wherein the first heat exchange channel has its ends connected to liquid reservoir 720 and second electronic expansion valve 770, respectively. The double-tube heat exchanger also includes a first bypass branch and a second bypass branch, wherein the first bypass branch has its ends connected to one end of the first heat exchange channel and the second heat exchange channel, respectively, and the second bypass branch has its ends connected to the other end of the second heat exchange channel and compressor 410, respectively. A first electronic expansion valve 760 is connected to the first bypass branch.

[0072] Reference Figure 1 、 Figure 3 and Figure 4 As shown, during the refrigeration process, the compressor 410 discharges high-temperature, high-pressure refrigerant gas, and the refrigerant gas passes through the four-way valve 710 and flows into the second flow channel of the shell-and-tube heat exchanger, so that the refrigerant gas exchanges heat with the heat carrier medium in the first flow channel, so that the refrigerant gas is converted into liquid, and the refrigerant liquid flowing out of the shell-and-tube heat exchanger flows into the liquid reservoir 720, and the liquid reservoir 720 is equipped with a needle valve 730 for vacuuming.

[0073] Reference Figure 1 、 Figure 3 and Figure 4 As shown, the refrigerant liquid is divided into two paths after passing through the liquid accumulator 720 and the first heat exchange channel of the economizer 750. One path of the refrigerant liquid flows into the first bypass branch, and after throttling and reducing the pressure after passing through the first electronic expansion valve 760, it becomes a gas-liquid mixture. The gas-liquid mixture flows into the second heat exchange channel of the economizer 750 again, so that the refrigerant in the first heat exchange channel and the refrigerant in the second heat exchange channel exchange heat, thereby further reducing the temperature of the refrigerant liquid in the first heat exchange channel. The gas-liquid mixture flows through the second heat exchange channel and then flows into the second bypass branch, and is then sucked into the auxiliary air inlet of the compressor 410.

[0074] Reference Figure 1 、 Figure 3 and Figure 4 As shown, the other refrigerant liquid passes through the second electronic expansion valve 770, where it is throttled and reduced in pressure before entering the evaporator 420. Within the evaporator 420, the refrigerant absorbs heat from the environment and becomes a low-pressure gas that is drawn into the intake port of the compressor 410. The two refrigerants mix within the working chamber of the compressor 410, are further compressed, and are discharged, forming a working cycle.

[0075] Reference Figure 1 、 Figure 3 and Figure 4 As shown, it can be understood that the shell and tube heat exchanger also includes a first branch connected in parallel with the economizer 750, and the first branch includes a first control valve, and a first capillary 510 and a first one-way valve 520 connected in sequence. The inlet end of the first capillary 510 is connected to the port of the shell and tube heat exchanger, and the outlet of the first one-way valve 520 is connected to the port of the evaporator 420. The first control valve is used to control the connection and disconnection of the first branch and the main flow.

[0076] Reference Figure 1 、 Figure 3 and Figure 4 As shown, the first branch can be a refrigeration auxiliary circuit. When the temperature control device is performing cooling, the first control valve is used to control the connection between the first branch and the main circuit. The first branch can divert part of the refrigerant so that the diverted refrigerant passes through the first capillary 510 and the first one-way valve 520 in sequence, which is beneficial to reducing the amount of refrigerant flowing through the economizer 750, thereby reducing the dissipation of cold energy at the economizer 750, and improving the economic benefits of the shell-and-tube heat exchanger.

[0077] Reference Figure 1 、 Figure 3 and Figure 4As shown, it can be understood that the temperature control device has both cooling and heating functions, and the flow direction of the refrigerant in the main flow path is opposite to the flow direction of the heat medium in the main flow path. The temperature control device also includes a second branch connected in parallel between the double-tube heat exchanger and the evaporator 420. The second branch includes a second control valve, and a first pressure relief valve 610, a second capillary tube 620, and a second one-way valve 630 connected in sequence. The inlet end of the second one-way valve 630 is connected to the port of the evaporator 420, and the outlet end of the first pressure relief valve 610 is connected to the port of the double-tube heat exchanger. The second control valve is used to control the connection between the second branch and the main flow path.

[0078] Reference Figure 1 、 Figure 3 and Figure 4 As shown, the second branch can be a heating auxiliary circuit. When the double-tube heat exchanger is heating, the second control valve is used to control the connection between the second branch and the main circuit. The second branch can divert part of the heat medium, so that the diverted heat medium passes through the second one-way valve 630, the second capillary tube 620, and the first pressure relief valve 610 in sequence. The pressure of the heat medium is reduced by the pressure relief valve 610, thereby further increasing the water temperature. Temperature control equipment can be equipment such as water heaters, air conditioners, and boilers.

[0079] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. Shell and tube heat exchanger, characterized in that, include: An inner tube (100) having a first flow channel therein; An outer tube (200) is sleeved on the outside of the inner tube (100), and a second flow channel is constructed between the inner wall surface of the outer tube (200) and the outer wall surface of the inner tube (100); A connecting assembly (300) comprises a three-way joint (310) and a fixed ring sleeve (320), wherein the three-way joint (310) comprises a liquid inlet and outlet end (311), a first connecting end (312) and a second connecting end (313), wherein the inner tube (100) is passed through the first connecting end (312) and the second connecting end (313), wherein the first connecting end (312) is connected to the end of the outer tube (200), and the second connecting end (313) is connected to the outer wall surface of the inner tube (100), wherein the fixed ring sleeve (320) is sleeved on the outer wall surface of the inner tube (100), wherein the outer wall surface of the fixed ring sleeve (320) is opposite to the liquid inlet and outlet end (311), and a third flow channel (330) communicating with the second flow channel is constructed between the outer wall surface of the fixed ring sleeve (320) and the inner wall surface of the three-way joint (310).

2. The double-tube heat exchanger according to claim 1, characterized in that: The first connecting end (312) and the second connecting end (313) are arranged in a straight line, and the inner diameter of the second connecting end (313) is smaller than the inner diameter of the first connecting end (312); and / or, The first connecting end (312) is sleeved on the outer wall surface of the outer tube (200).

3. The double-tube heat exchanger according to claim 1, characterized in that: The connection assembly (300) comprises two three-way connectors (310), and the two ends of the outer tube (200) are respectively provided with the three-way connectors (310).

4. The double-tube heat exchanger according to claim 1, characterized in that: The outer wall surface of the inner tube (100) is provided with a spiral groove.

5. The double-tube heat exchanger according to claim 4, characterized in that: The inner tube (100) is formed by a corrugated tube knob; and / or, The second connecting end (313) is welded to the outer wall of the inner tube (100); and / or, The number of the spiral grooves is 6 or 8.

6. The double-tube heat exchanger according to any one of claims 1 to 4, characterized in that: The inner tube (100), the outer tube (200) and the connecting assembly (300) together constitute a heat exchange assembly, and two heat exchange assemblies are provided.

7. Temperature control equipment, characterized by: The invention comprises the double-tube heat exchanger according to any one of claims 1 to 6.

8. The temperature control device according to claim 7, characterized in that: It also includes a compressor (410) and an evaporator (420), wherein the compressor (410), the double-tube heat exchanger, and the evaporator (420) are connected in sequence to form a main flow path.

9. The temperature control device according to claim 8, characterized in that: The invention also includes an economizer (750) connected between the shell-and-tube heat exchanger and the evaporator (420), and a first branch connected in parallel with the economizer (750), wherein the first branch includes a first control valve, and a first capillary tube (510) and a first one-way valve (520) connected in sequence, wherein the inlet end of the first capillary tube (510) is connected to the port of the shell-and-tube heat exchanger, and the outlet end of the first one-way valve (520) is connected to the port of the evaporator (420), and the first control valve is used to control the opening and closing of the first branch and the main flow.

10. The temperature control device according to claim 8, characterized in that: The invention also includes a second branch connected in parallel between the shell-and-tube heat exchanger and the evaporator (420), wherein the second branch includes a second control valve, and a first pressure relief valve (610), a second capillary tube (62), and a second one-way valve (630) connected in sequence, wherein the inlet end of the second one-way valve (630) is connected to the port of the evaporator (420), and the outlet end of the first pressure relief valve (610) is connected to the port of the shell-and-tube heat exchanger, and the second control valve is used to control the connection and disconnection of the second branch and the main flow.

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