Air handling unit

Abstract

The invention discloses an air handling unit and relates to the technical field of air conditioning equipment, a containing cavity for containing a piping part connector is formed in the inner side of a box door, a cavity is formed between the box door and the side wall of the side, facing the box door, of a heat exchanger, and the box door is provided with a second opening used for allowing the connector to penetrate through at the communicating position of the containing cavity and the cavity. The refrigerant leakage detection sensor is arranged in the cavity, and the accommodating cavity is directly communicated with the cavity through the second opening, so that the path of diffusing the leaked refrigerant at the joint to the cavity is shorter, and the leaked refrigerant in the cavity and the accommodating cavity can be quickly detected by the refrigerant leakage detection sensor; the refrigerant leakage detection sensor is used for detecting leakage at the heat exchanger and the connector, the detection range of the refrigerant leakage detection sensor is utilized to the maximum extent, the safety level is improved, and the production cost is reduced; and detection can be performed without operation of a fan, so that the detection accuracy is high and the reliability is high.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning equipment, and in particular to an air handling unit. Background Art

[0002] The refrigerant leakage detection system of the air handling unit is required to detect any potential leakage point within a limited time and perform related actions. Since the heat exchanger has multiple potential refrigerant leakage points, the refrigerant leakage detection sensor is generally placed near the heat exchanger inside the box. However, the outer pipe joint of the air handling unit used for the external refrigerant pipe generally extends outside the box. In order to effectively monitor the leakage at the outer pipe joint, an additional refrigerant leakage detection sensor needs to be placed near the outer pipe joint, which increases production costs and reduces product competitiveness.

[0003] In the related art, there is an air conditioner that has a refrigerant leak detection sensor installed at the fan, and transmits the refrigerant leaking from the outer pipe joint to the fan through a transmission channel. However, the refrigerant leak detection sensor can only achieve rapid detection when the fan is rotating to drain the air, and the refrigerant leaking from the outer pipe joint needs to pass through a longer transmission path to reach the fan, so the concentration of the refrigerant transmitted to the fan is reduced, making it difficult to be detected by the refrigerant leak detection sensor. If the detection threshold of the refrigerant leak detection sensor is lowered in order to overcome the above defects, the probability of false alarm of refrigerant leak will increase. Summary of the invention

[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 an air handling unit, which can detect refrigerant leakage of a heat exchange body and a joint of a piping part through a refrigerant leakage detection sensor, and the communication path between the space where the heat exchange body is located and the space where the joint of the piping part is located is shorter, and refrigerant leakage detection can be achieved without the need for a fan to rotate and drain, with higher accuracy and reliability.

[0005] According to an embodiment of the present invention, the air handling unit includes: a box body, including a peripheral wall, one side of the peripheral wall is provided with a first opening; a heat exchanger, installed in the box body, the heat exchanger includes a heat exchange body and a piping part, the piping part is connected to the side of the heat exchange body facing the first opening, and the piping part is provided with a joint; a box door, connected to the peripheral wall and covering the first opening, a cavity is formed between the box door and the side wall of the heat exchange body facing the box door, a accommodating cavity for accommodating the joint is formed on the inner side of the box door, the box door is provided with a second opening at the connection between the accommodating cavity and the cavity, and the second opening is used for the joint to pass through; a refrigerant leakage detection sensor is arranged in the cavity, and the refrigerant leakage detection sensor is used to detect leakage of refrigerant in the cavity and / or the accommodating cavity.

[0006] The air handling unit according to the embodiment of the present invention has at least the following beneficial effects:

[0007] A accommodating chamber for accommodating the joint of the piping part is formed through the inner side of the box door, a cavity is formed between the box door and the side wall of the heat exchange main body facing the box door, and the box door is provided with a second opening for the joint to pass through at the connection between the accommodating chamber and the cavity, and the refrigerant leakage detection sensor is arranged in the cavity, and the accommodating chamber is directly connected to the cavity through the second opening, so that the path for the refrigerant leaking at the joint to diffuse to the cavity is shorter, so that the refrigerant leakage in the cavity and the accommodating chamber can be quickly detected by the refrigerant leakage detection sensor after leakage, so that one refrigerant leakage detection sensor can detect leakage at the heat exchange main body and the joint, thereby maximizing the detection range of the refrigerant leakage detection sensor, improving the safety level, and reducing the production cost; moreover, this scheme can detect without the fan running, and has high detection accuracy and reliability.

[0008] According to some embodiments of the present invention, on a projection plane perpendicular to the thickness direction of the cabinet door, the projection of the refrigerant leakage detection sensor is not higher than an upper edge of the projection of the second opening.

[0009] According to some embodiments of the present invention, on a projection plane perpendicular to the thickness direction of the cabinet door, the projection of the refrigerant leakage detection sensor is not lower than a lower edge of the projection of the first opening.

[0010] According to some embodiments of the present invention, the air handling unit further comprises a main water receiving pan connected to the lower end of the heat exchange body, and the refrigerant leakage detection sensor is located on a side close to the main water receiving pan.

[0011] According to some embodiments of the present invention, the air handling unit further comprises a water receiving structure connected to the refrigerant leakage detection sensor, wherein the water receiving structure is used to guide the condensed water generated by the heat exchanger to the main water receiving pan.

[0012] According to some embodiments of the present invention, the air handling unit further includes an auxiliary water receiving tray, which is connected to one side of the heat exchange body along the left-right direction, and the joint and the refrigerant leakage detection sensor are located on a side close to the auxiliary water receiving tray.

[0013] According to some embodiments of the present invention, the accommodating cavity is configured to be formed by being recessed from the inner side of the cabinet door in a direction away from the heat exchange body.

[0014] According to some embodiments of the present invention, the box door includes a panel and a cover shell, the panel is provided with the second opening, the cover shell is installed on the panel and covers the second opening, and the accommodating cavity is formed on the inner side of the cover shell.

[0015] According to some embodiments of the present invention, the cover shell is provided with a first through hole connecting the accommodating cavity and the external space of the air handling unit, the first through hole is used for allowing an external pipeline connected to the joint to pass through, and a sealing ring is installed between the first through hole and the external pipeline.

[0016] According to some embodiments of the present invention, the cover shell includes a piping plate and an outer cover protruding outward relative to the piping plate; the piping plate is provided with a second through hole, and the outer cover covers the second through hole to form the accommodating cavity.

[0017] According to some embodiments of the present invention, the outer cover includes a first cover body and a second cover body that are arranged opposite to each other, and the first cover body and the second cover body are respectively connected to the pipe plate and enclose to form the accommodating cavity.

[0018] According to some embodiments of the present invention, at least a portion of the side wall of the first cover body facing the second cover body is provided with a convex strip, and the side wall of the second cover body facing the first cover body is provided with a groove engaged with the convex strip.

[0019] According to some embodiments of the present invention, a folded edge is provided on the periphery of the pipe plate, the folded edge is connected to the panel, and the outer wall surface of the pipe plate is flush with the outer wall surface of the panel.

[0020] According to some embodiments of the present invention, the cover shell is an integrally formed part, and includes a piping plate portion and an outer cover portion protruding outward relative to the piping plate portion, and a second through hole is formed at the connection between the outer cover portion and the piping plate portion.

[0021] According to some embodiments of the present invention, on a projection plane perpendicular to the thickness direction of the cabinet door, the projection of the refrigerant leakage detection sensor is not higher than the upper edge of the projection of the inner wall of the second through hole.

[0022] According to some embodiments of the present invention, the air handling unit further includes a first thermal insulation layer and a second thermal insulation layer, wherein the first thermal insulation layer is disposed on the inner side of the cabinet door, and the second thermal insulation layer is disposed on the inner wall of the accommodating cavity.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0025] Figure 1 A schematic structural diagram of an air handling unit according to an embodiment of the present invention;

[0026] Figure 2 for Figure 1 The schematic diagram of the structure of the heat exchange box of the air handling unit shown in FIG. 1 after the box door is opened;

[0027] Figure 3 for Figure 1 A front view of the air handling unit is shown;

[0028] Figure 4 for Figure 3 Sectional view of the middle section AA;

[0029] Figure 5 for Figure 4 The enlarged view of point B in the middle;

[0030] Figure 6 This is a front view of a heat exchange box with the door removed according to another embodiment of the present invention;

[0031] Figure 7 for Figure 1 An exploded view of an embodiment of a middle box door;

[0032] Figure 8 for Figure 7 An enlarged view of the outer cover in the door is shown;

[0033] Fig. 9 for Figure 1 An exploded view of another embodiment of a middle box door.

[0034] Figure Number:

[0035] Heat exchange box 100; heat exchanger 110; heat exchange body 111; piping part 112; joint 113; box body 120; peripheral wall 121; first opening 122; box door 130; accommodating chamber 131; second opening 132; opening upper edge 1321; panel 133; cover 134; first through hole 1341; positioning groove 1342; piping plate part 1343; outer cover part 1344; second folding edge 1345; piping plate 135 ; second through hole 1351; third through hole 1352; fourth through hole 1353; first folded edge 1354; upper wall 1355; outer cover 136; first cover body 1361; second cover body 1362; convex strip 1363; groove 1364; first half hole 1365; second half hole 1366; cavity 140; first thermal insulation layer 150; second thermal insulation layer 160; main water receiving tray 170; auxiliary water receiving tray 180; sealing ring 190;

[0036] Fan box 200; fan 210;

[0037] Refrigerant leakage detection sensor 300;

[0038] The water receiving structure 400 . DETAILED DESCRIPTION

[0039] Embodiments of the present invention are described in detail below, and 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 only used to explain the present invention, and cannot be understood as limiting the present invention.

[0040] In the description of the present invention, it should be understood that descriptions involving orientation, such as orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the 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 should not be understood as a limitation on the present invention.

[0041] In the description of the present invention, "a plurality" means more than two. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0042] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. 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.

[0043] An air handling unit according to an embodiment of the present invention is usually installed in a loft, basement or other location. Since the installation location is relatively hidden, if a refrigerant leak occurs and cannot be discovered in time, there will be a greater safety risk. In view of this, an air handling unit is generally provided with a refrigerant leak detection system, such as a refrigerant leak detection sensor is set at a location prone to leakage, so as to monitor the concentration of the refrigerant in the air handling unit. When the concentration of the refrigerant exceeds a preset threshold, a feedback signal is sent to the main control board, and the air handling unit can adopt measures such as starting the fan, shutting down the compressor and electric auxiliary heating to avoid risks.

[0044] When the air handling unit is in standby mode, if the refrigerant leaks, the refrigerant will diffuse downward because the density of the refrigerant is greater than the density of the air. In the related art, the refrigerant leakage detection sensor in the air handling unit is generally used to detect the leakage of the coil of the heat exchanger, but the leakage at the joint of the heat exchanger extending outside the box cannot be detected. Therefore, in order to meet the safety requirements, the air handling unit needs to add a new refrigerant leakage detection sensor, but it will undoubtedly greatly increase the manufacturing cost.

[0045] In the related art, some air conditioners also use a refrigerant leakage detection sensor to monitor locations such as the coils and joints of the heat exchanger where refrigerant leakage is likely to occur. The refrigerant leakage detection sensor is set at the fan, and transmits the refrigerant leaking at the outer pipe joint to the fan through a transmission channel. However, the refrigerant leaking from the above air conditioner can only be quickly detected by the refrigerant leakage detection sensor under the condition that the fan rotates and drains, and the refrigerant leaking from the outer pipe joint needs to go through a longer transmission path to reach the fan. Therefore, the concentration of the refrigerant transmitted to the fan is reduced, making it difficult to be detected by the refrigerant leakage detection sensor. If the detection threshold of the refrigerant leakage detection sensor is lowered in order to overcome the above defects, the probability of false alarm of refrigerant leakage will increase.

[0046] In order to reduce manufacturing costs, improve product competitiveness, and overcome the defects of some air conditioners in related technologies, the air handling unit of an embodiment of the present invention adopts a refrigerant leakage detection sensor to simultaneously monitor the locations such as the coils and joints of the heat exchanger where refrigerant leakage is prone to occur, and the monitoring response speed is fast.

[0047] Reference Figure 1 and Figure 2 As shown, an air handling unit according to an embodiment of the present invention includes a detachably connected heat exchange box 100 and a fan box 200 for easy installation and transportation. Figure 3 and Figure 4As shown, it can be understood that a heat exchanger 110 is installed inside the heat exchange box 100, and a fan 210 is installed inside the fan box 200. During operation, the fan 210 drives the indoor air to flow through the heat exchanger 110 for heat exchange (cooling or heating), and the gas after heat exchange is blown out to the indoor environment, thereby realizing the temperature regulation of the indoor environment by the air handling unit. The heat exchange box 100 and the fan box 200 are connected by components such as detachable locks; as an alternative, the heat exchange box 100 and the fan box 200 can also be fixedly connected by structures such as screws. In an air handling unit of another embodiment of the present invention, the heat exchange box 100 and the fan box 200 can also be made into an integrated structure, and the air handling unit can be transported and installed as a whole.

[0048] The heat exchanger 110 includes a heat exchange body 111 and a piping portion 112. The piping portion 112 is used to connect the heat exchange body 111 to an external pipeline of the air handling unit to form a refrigerant circulation system. In order to achieve efficient heat exchange performance, the heat exchange body 111 includes a coil. The bend of the coil is a structural weak point, so refrigerant leakage is prone to occur. In order to improve the safety of the air handling unit, the air handling unit of the embodiment of the present invention includes a refrigerant leakage detection sensor 300, and the refrigerant leakage detection sensor 300 is installed in the heat exchange box 100.

[0049] The embodiment of the present invention is described below by taking the heat exchange box 100 as an example.

[0050] Reference Figure 1 and Figure 2 As shown, the heat exchange box 100 of the embodiment of the present invention includes a box body 120, a heat exchanger 110 and a box door 130. The box body 120 includes a peripheral wall 121, and a first opening 122 is provided on one side of the peripheral wall 121. The heat exchanger 110 is installed in the box body 120 through the first opening 122. The box door 130 is used to cover the first opening 122. When the box door 130 is connected to the peripheral wall 121, a cavity 140 is formed between the box door 130 and the side wall of the heat exchanger 110 facing the box door 130. The heat exchanger 110 includes a heat exchange body 111 and a piping part 112. The piping part 112 is connected to the side of the heat exchange body 111 facing the first opening 122, that is, the piping part 112 is located in the cavity 140. The piping part 112 is provided with a joint 113 for connecting an external pipeline. The joint 113 is generally provided with two, including a refrigerant inlet joint and a refrigerant outlet joint. The joint 113 can be connected to the external pipeline by threading, welding or other methods, so the joint 113 is another position of the air handling unit where refrigerant leakage is likely to occur.

[0051] Reference Figure 3 , Figure 4 and Figure 5As shown, a receiving cavity 131 is formed on the inner side of the door 130, and a second opening 132 is provided at the connecting portion between the receiving cavity 131 and the cavity 140. The second opening 132 is used to directly connect the receiving cavity 131 and the cavity 140. Figure 5 In the front-to-back direction, the accommodating chamber 131 is close to the cavity 140 and is located at the front side of the cavity 140. In addition, the second opening 132 is used for the joint 113 to pass through, so the path for the refrigerant leaking from the joint 113 to diffuse into the cavity 140 can be shortened.

[0052] It is understood that the accommodating cavity 131 can be formed by an inner wall surface protruding toward the outside of the door 130; alternatively, the accommodating cavity 131 can also be formed by an outer wall surface recessed toward the inside of the door 130 and the inner side of a cover plate covering the recessed opening, the cover plate is constructed as a part of the door 130, the recess is located on the inside of the door 130, and the recess is connected to the cavity 140 through a through hole. The joint 113 is provided in the accommodating cavity 131, and it is understood that the entire structure of the joint 113 is built into the accommodating cavity 131; alternatively, part of the structure of the joint 113 is built into the accommodating cavity 131, and another part of the structure is built into the cavity 140.

[0053] The refrigerant leakage detection sensor 300 of the embodiment of the present invention is arranged in the cavity 140, and the refrigerant leakage detection sensor 300 is used to detect the leakage of the refrigerant in the cavity 140 and the accommodating cavity 131. Since the accommodating cavity 131 is directly connected to the cavity 140 through the second opening 132, the path for the refrigerant leaking at the joint 113 to diffuse to the cavity 140 is shorter, so the refrigerant leakage in the cavity 140 and the accommodating cavity 131 can be quickly detected by the refrigerant leakage detection sensor 300 after leakage, so that one refrigerant leakage detection sensor 300 can detect the leakage at the heat exchange body 111 and the joint 113, and the detection range of the refrigerant leakage detection sensor 300 is maximized, thereby improving the safety level and reducing the production cost. Moreover, the embodiment of the present invention can detect without the fan 210 running, that is, effective detection can be achieved in the standby state, with high detection accuracy and reliability. The refrigerant has a certain pressure in the refrigerant pipe, so when the refrigerant leaks, it will be in a spray state and released into the cavity 140 between the door 130 and the heat exchanger 110. The refrigerant flows in the cavity 140 under the action of gravity. In order to enable the above-mentioned multiple locations where refrigerant leakage is prone to be detected in time, the embodiment of the present invention sets the refrigerant leakage detection sensor 300 in the cavity 140 between the heat exchanger 110 and the door 130.

[0054] In the embodiment of the present invention, the air handling unit is installed longitudinally (i.e. Figure 3The installation state in FIG. 2 is taken as an example. When the air handling unit is installed longitudinally, the air inlet and outlet of the heat exchange box 100 and the fan box 200 are both located at the upper end or the lower end. The heat exchange box 100 and the fan box 200 are arranged in the up-down direction, for example, the heat exchange box 100 is located below the fan box 200, or the fan box 200 is located below the heat exchange box 100. Alternatively, the heat exchange box 100 and the fan box 200 are arranged side by side in the left-right direction, and an air duct connection is provided at the upper end or the lower end of the heat exchange box 100 and the fan box 200.

[0055] The refrigerant leakage detection sensor 300 of the embodiment of the present invention is configured as follows: in a direction perpendicular to the thickness direction of the cabinet door 130 (i.e. Figure 5 On the projection surface (in the front-to-back direction in FIG. 1 ), the projection of the refrigerant leakage detection sensor 300 is not higher than the upper edge of the projection of the second opening 132. It can be understood that the upper edge of the projection of the second opening 132 passes through Figure 6 When the second opening 132 is projected onto the projection plane along the front-to-back direction, if the first contour line at the uppermost end in the up-down direction is parallel to the left-to-right direction, the straight line where the first contour line is located is L1 (in one embodiment, the first contour line is as follows Figure 5 and Figure 7 The upper edge of the opening 1321 in the cavity 131 is defined as L1; if the first contour line is not parallel to the left-right direction, a straight line passing through the uppermost point and parallel to the left-right direction is defined as L1. Thus, when refrigerant leaks in the accommodating cavity 131, the refrigerant will be released into the cavity 140 under the action of gravity. The refrigerant leakage detection sensor 300 disposed in the above-mentioned area can detect the leaked refrigerant more quickly. When the cavity 140 below the refrigerant leakage detection sensor 300 leaks, the refrigerant can also be detected by the refrigerant leakage detection sensor 300 when the refrigerant is released in a spraying state.

[0056] The refrigerant leakage detection sensor 300 of another embodiment of the present invention is configured as follows: in a direction perpendicular to the thickness direction of the cabinet door 130 (i.e. Figure 5 On the projection surface (in the front-to-back direction in FIG. 1 ), the projection of the refrigerant leakage detection sensor 300 is not lower than the lower edge of the projection of the first opening 122. It can be understood that the lower edge of the projection of the first opening 122 passes through Figure 6The second straight line L2 in is defined. When the first opening 122 is projected onto the projection surface along the front-back direction, if the second contour line at the lowest end in the up-down direction is parallel to the left-right direction, the straight line where the second contour line is located is L2; ​​if the second contour line is not parallel to the left-right direction, the straight line passing through the lowest point and parallel to the left-right direction is taken as L2. Thus, when refrigerant leakage occurs in the cavity 140, the refrigerant is released into the cavity 140, and the refrigerant leakage detection sensor 300 is arranged in the above-mentioned area to ensure that the leaked refrigerant is detected, and when the cavity 140 below the refrigerant leakage detection sensor 300 leaks, the refrigerant is released in a spraying state and can also be detected by the refrigerant leakage detection sensor 300.

[0057] The refrigerant leakage detection sensor 300 of another embodiment of the present invention is configured as follows: in a direction perpendicular to the thickness direction of the cabinet door 130 (i.e. Figure 5 On the projection surface (in the front-to-back direction in the figure), the projection of the refrigerant leakage detection sensor 300 is located in the area between L1 and L2. Therefore, when refrigerant leakage occurs in the accommodating chamber 131 and the cavity 140, the refrigerant will be released into the cavity 140 and detected by the refrigerant leakage detection sensor 300. When the cavity 140 below the refrigerant leakage detection sensor 300 leaks, the refrigerant is released in a jetting state and can also be detected by the refrigerant leakage detection sensor 300.

[0058] In another embodiment of the present invention, the air handling unit is installed horizontally. Figure 3 The air handling unit is shown in the installation state after being rotated 90 degrees to the right, or Figure 3 The heat exchange box 100 and the fan box 200 of the air handling unit are shown in the installation state after being interchanged up and down and then rotated 90 degrees to the right. When the air handling unit is installed horizontally, the definitions of L1 and L2 should be understood adaptively. For example, L1 is the straight line where the left edge of the projection of the second opening 132 is located, and the projection of the refrigerant leakage detection sensor 300 is located on the right side of L1; L2 is the straight line where the right edge of the projection of the first opening 122 is located, and the projection of the refrigerant leakage detection sensor 300 is located on the left side of L2.

[0059] When the refrigerant leakage detection sensor 300 is set in the above-mentioned area, the refrigerant concentration can be quickly monitored when the air handling unit is in standby mode. Since the internal space of the box body 120 and the space of the accommodating cavity 131 are directly connected, the refrigerant at the joint 113, the coil and other positions of the heat exchanger 110 can be quickly released to the cavity 140, so that it can be effectively detected by the refrigerant leakage detection sensor 300, so that the air handling unit can monitor the leakage at the heat exchange body 111 and the joint 113, maximize the detection range of the refrigerant leakage detection sensor 300, and improve the safety level. Moreover, compared with the related art using two refrigerant leakage detection sensors 300, the embodiment of the present invention does not increase the number of refrigerant leakage detection sensors 300, which can reduce the production cost.

[0060] Furthermore, the above-mentioned area where the refrigerant leakage detection sensor 300 is set does not have high humidity or large temperature difference, so the detection accuracy of the refrigerant leakage detection sensor 300 can be guaranteed.

[0061] Reference Figure 5 As shown, in order to suppress the generation of condensed water on the box door 130, the heat exchange box 100 also includes a first insulation layer 150 and a second insulation layer 160. The first insulation layer 150 is arranged on the inner side of the box door 130, and the second insulation layer 160 is arranged on the inner wall of the accommodating cavity 131. The first insulation layer 150 and the second insulation layer 160 can be fixed by bonding or clamping, etc., which is not specifically limited here. The first insulation layer 150 and the second insulation layer 160 can be made of insulation materials such as insulation cotton and foam, which is not specifically limited here. In order to further reduce the generation of condensed water inside the box body 120, an insulation layer also needs to be provided on the inner side of the peripheral wall 121.

[0062] The embodiment of the present invention continues to install the air handling unit longitudinally (i.e. Figure 3 This article will take the installation status in the example as an example.

[0063] Reference Figure 6As shown, an air handling unit of an embodiment of the present invention further includes a main water receiving tray 170. The heat exchanger 110 is installed on the main water receiving tray 170, and the main water receiving tray 170 is detachably connected to the housing 120, so that the main water receiving tray 170 and the heat exchanger 110 can be conveniently installed as a whole or removed from the housing 120. For example, a guide rail is provided at the connection between the main water receiving tray 170 and the housing 120, so that the main water receiving tray 170 can slide relative to the housing 120. When the heat exchanger 110 needs to be repaired, the maintenance personnel can open the door 130 and conveniently take out and put in the heat exchanger 110 through the first opening 122. As an alternative, the heat exchanger 110 can also be directly installed in the housing 120, instead of being indirectly installed through the main water receiving tray 170. For example, the heat exchanger 110 is directly fixed to the peripheral wall 121 by riveting or welding.

[0064] Reference Figure 3 The air handling unit shown is installed in a vertical position, in which case the air inlet is located below the heat exchange box 100, and the condensed water generated by the heat exchanger 110 flows downward. The main water receiving tray 170 is used to receive the condensed water generated by the heat exchanger 110 in this installation mode. Therefore, along the height direction, the main water receiving tray 170 is connected to the lower end of the heat exchange body 111, so that the condensed water generated by the heat exchanger 110 can be conveniently received. The refrigerant leakage detection sensor 300 is located on a side close to the main water receiving tray 170.

[0065] Reference Figure 6 As shown, it can be understood that the air handling unit further includes a water receiving structure 400. The water receiving structure 400 is fixedly connected to the refrigerant leakage detection sensor 300, and is used to guide the condensed water dripping from the coil or the piping part 112 to the main water receiving tray 170, effectively avoiding the damage of the condensed water to the refrigerant leakage detection sensor 300, or causing the refrigerant leakage detection sensor 300 to have a detection error. For example, the water receiving structure 400 forms a water guiding slope on the upward side, and the water guiding slope extends to the main water receiving tray 170.

[0066] Reference Figure 6 As shown, the air handling unit of another embodiment of the present invention further includes an auxiliary water receiving tray 180. The auxiliary water receiving tray 180 is connected to the main water receiving tray 170, or connected to the heat exchange body 111. As an alternative installation method, the auxiliary water receiving tray 180 can be connected to the main water receiving tray 170 and the heat exchange body 111 at the same time, thereby improving the installation stability of the auxiliary water receiving tray 180. The auxiliary water receiving tray 180 is arranged along the heat exchange body 111. Figure 6 When the air handling unit is installed in a horizontal position, the left side of the heat exchange box 100 is the air inlet, and the condensed water generated by the heat exchanger 110 flows downward. The auxiliary water receiving tray 180 is located below the heat exchanger 110 and is used to receive the condensed water generated by the heat exchanger 110 in this installation mode.

[0067] Reference Figure 6 As shown, it can be understood that the joint 113 and the refrigerant leakage detection sensor 300 are located on a side close to the auxiliary water receiving tray 180, so that the air handling unit can be easily installed with external pipes in different installation modes, and it is convenient to improve the detection speed of the refrigerant leakage detection sensor 300 when a leak occurs at the joint 113. Figure 6 The center line of the heat exchange box 100 in the left-right direction is L3, and the refrigerant leakage detection sensor 300 is located on the side close to the auxiliary water receiving tray 180, which should be understood as the refrigerant leakage detection sensor 300 is located on the right side of the center line L3 as a whole.

[0068] It can be understood that the accommodating chamber 131 of the embodiment of the present invention is configured to be formed by the inner side of the box door 130 being recessed in the direction away from the heat exchange body 111. Therefore, the accommodating chamber 131 is located at the front side of the cavity 140 and is close to each other, thereby minimizing the path for the refrigerant leaking at the joint 113 to diffuse into the cavity 140 and improving the detection accuracy of the refrigerant leakage detection sensor 300.

[0069] Reference Figure 5 and Figure 7 As shown, a door 130 of an embodiment of the present invention includes a panel 133 and a cover 134. The panel 133 is provided with a second opening 132, and the cover 134 is installed at the second opening 132 of the panel 133. The cover 134 is used to cover the second opening 132, and the inner side of the cover 134 forms a receiving cavity 131. The cover 134 is configured to be along Figure 5 The heat exchange box 100 has a structure that protrudes toward the outside of the panel 133 in the front-to-back direction, and the joint 113 extends from the second opening 132 of the panel 133 into the interior of the cover 134. The joint 113 is not exposed to the outside of the heat exchange box 100, so that when refrigerant leakage occurs at the joint 113, the leaked refrigerant can diffuse into the cavity 140 through the second opening 132, thereby being monitored by the refrigerant leakage detection sensor 300.

[0070] Reference Figure 7As shown, it can be understood that the housing 134 is provided with a first through hole 1341, and the first through hole 1341 communicates with the accommodating chamber 131 and the external space of the air handling unit. The first through hole 1341 is used for the external pipeline connected to the joint 113 to pass through, and a sealing ring 190 is installed between the first through hole 1341 and the external pipeline. The number of the first through holes 1341 is the same as the number of the external pipelines, and each external pipeline is inserted into the accommodating chamber 131 through a first through hole 1341, respectively. The sealing ring 190 is used to form a seal between the accommodating chamber 131 and the external space of the air handling unit, so that when the refrigerant leaks at the joint 113, the leaked refrigerant will not flow out of the external space from the first through hole 1341, resulting in the refrigerant leakage detection sensor 300 not being easy to monitor, affecting the detection speed. As an alternative, the first through hole 1341 and the sealing ring 190 are each provided with one, and the sealing ring 190 is provided for two or more external pipelines to pass through, thereby playing a sealing role.

[0071] In order to improve the installation stability of the sealing ring 190 and the cover shell 134 , a positioning groove 1342 is formed on the inner wall of the first through hole 1341 , and the sealing ring 190 is snapped into the positioning groove 1342 , thereby reducing the probability of the sealing ring 190 coming out.

[0072] Reference Figure 7 and Figure 8 As shown, it can be understood that the housing 134 includes a pipe plate 135 and an outer cover 136 protruding toward the outside of the pipe plate 135. The pipe plate 135 is provided with a second through hole 1351, a third through hole 1352 and a fourth through hole 1353. The second through hole 1351 is used to connect the cavity 140, the third through hole 1352 is used for the drainage hole of the main water receiving tray 170 to extend, and the fourth through hole 1353 is used for the drainage hole of the auxiliary water receiving tray 180 to extend. The outer cover 136 is sealed and connected to the pipe plate 135, and the outer cover 136 is used to cover the second through hole 1351. The outer cover 136 protrudes outward relative to the pipe plate 135, and the inner wall of the outer cover 136 forms a receiving cavity 131. The embodiment of the present invention adopts the matching structure of the pipe plate 135 and the outer cover 136, which is convenient for the installation of the box door 130, and also convenient for the installation of the external pipeline and the joint 113, reducing the difficulty of assembly and improving the efficiency of assembly.

[0073] Reference Figure 8As shown, it can be understood that the outer cover 136 includes a first cover body 1361 and a second cover body 1362 arranged opposite to each other, and the first cover body 1361 and the second cover body 1362 enclose the accommodating chamber 131. The first cover body 1361 and the second cover body 1362 can be made by injection molding, sheet metal or other processes. The first cover body 1361 and the second cover body 1362 are respectively connected to the pipe plate 135, for example, by riveting, screwing, etc. The connection structure of the first cover body 1361 and the second cover body 1362 makes the installation between the joint 113 and the external pipeline more convenient. When it is necessary to assemble the box door 130, the panel 133 is first fixedly connected to the box body 120, and then the pipe plate 135 is fixedly connected to the panel 133, and then the joint 113 extending from the pipe plate 135 is connected to the external pipeline, and finally the outer cover 136 is assembled.

[0074] Reference Figure 8 As shown, it can be understood that at least part of the side wall of the first cover body 1361 facing the second cover body 1362 is provided with a convex strip 1363, and the side wall of the second cover body 1362 facing the first cover body 1361 is provided with a groove 1364 engaged with the convex strip 1363. When the first cover body 1361 and the second cover body 1362 are fixedly connected, the spliced ​​part can achieve better sealing due to the cooperation of the convex strip 1363 and the groove 1364, so that the sealing performance of the side wall of the outer cover 136 is better. As an alternative solution, the convex strip 1363 is provided on the second cover body 1362, and the groove 1364 is provided on the first cover body 1361.

[0075] Reference Figure 7 and Figure 8 As shown, the first through hole 1341 is provided in the outer cover 136. The first cover body 1361 is provided with a first half hole 1365, and the second cover body 1362 is provided with a second half hole 1366. The first half hole 1365 and the second half hole 1366 constitute the first through hole 1341, so that the overall structure of the outer cover 136 is more stable and the installation is more convenient.

[0076] Reference Figure 7 As shown, it can be understood that the periphery of the pipe plate 135 is provided with a first folded edge 1354, and the first folded edge 1354 is arranged around the connection between the pipe plate 135 and the panel 133, so as to improve the structural strength of the pipe plate 135 and the sealing between the pipe plate 135 and the panel 133. The first folded edge 1354 and the panel 133 can be fixed by riveting, screwing, welding, etc. The outer wall surface of the pipe plate 135 is flush with the outer wall surface of the panel 133, which is conducive to saving the installation space of the air handling unit and also improves the aesthetics of the air handling unit.

[0077] Reference Fig. 9As shown, a door 130 of another embodiment of the present invention includes a panel 133 and a cover shell 134. The structure of the panel 133 is basically the same as that of the previous embodiment. The cover shell 134 is an integrally formed part; for example, the cover shell 134 is formed by integral stamping or integral injection molding. The cover shell 134 includes a piping plate portion 1343 and an outer cover portion 1344, the outer cover portion 1344 protrudes outward relative to the piping plate portion 1343, and forms a accommodating cavity 131, and a second through hole 1351 of the accommodating cavity 131 is formed at the connection between the outer cover portion 1344 and the piping plate portion 1343. The joint 113 extends into the interior of the outer cover portion 1344 through the second through hole 1351. Compared with the split manufacturing method, the embodiment of the present invention does not need to open a hole in the panel 133, and can directly form a second through hole 1351 that connects the accommodating cavity 131 to the inner cavity, and the sealing performance is also better.

[0078] Reference Fig. 9 As shown, it can be understood that the periphery of the pipe plate portion 1343 is provided with a second folded edge 1345, and the second folded edge 1345 is arranged around the connection between the housing 134 and the panel 133, so as to improve the structural strength of the housing 134 and the sealing between the housing 134 and the panel 133. The second folded edge 1345 and the panel 133 can be fixedly connected to the panel 133 by riveting, screwing, welding, etc. The outer wall surface of the pipe plate portion 1343 is flush with the outer wall surface of the panel 133, which is conducive to saving the installation space of the air handling unit and also improves the aesthetics of the air handling unit.

[0079] The refrigerant leakage detection sensor 300 of another embodiment of the present invention is configured as follows: in a direction perpendicular to the thickness direction of the cabinet door 130 (i.e. Figure 5 On the projection surface (in the front-to-back direction in FIG. 1 ), the projection of the refrigerant leakage detection sensor 300 is not higher than the upper edge of the projection of the inner wall of the second through hole 1351. It can be understood that the upper edge of the projection of the inner wall of the second through hole 1351 is Figure 7 The upper wall surface 1355 shown is a straight line where the contour line is when projected onto the projection surface along the front-back direction. Therefore, when refrigerant leaks in the accommodating chamber 131, the refrigerant will be released into the cavity 140 under the action of gravity. The refrigerant leakage detection sensor 300 disposed in the above area can detect the leaked refrigerant more quickly, and when the cavity 140 below the refrigerant leakage detection sensor 300 leaks, the refrigerant can also be detected by the refrigerant leakage detection sensor 300 when the refrigerant is released in a spraying state.

[0080] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. An air handling unit, characterized in that: include: The box body comprises a peripheral wall, and a first opening is provided on one side of the peripheral wall; A heat exchanger installed in the box, the heat exchanger comprising a heat exchange body and a piping portion, the piping portion is connected to a side of the heat exchange body facing the first opening, and the piping portion is provided with a joint; a box door connected to the peripheral wall and covering the first opening, a cavity being formed between the box door and a side wall of the heat exchange body facing the box door, a receiving cavity for receiving the joint being formed on the inner side of the box door, and a second opening being provided at the connection between the receiving cavity and the cavity, the second opening being used for the joint to pass through; A refrigerant leakage detection sensor is disposed in the cavity, and the refrigerant leakage detection sensor is used to detect leakage of refrigerant in the cavity and / or the accommodating chamber.

2. The air handling unit according to claim 1, characterized in that: On a projection plane perpendicular to the thickness direction of the cabinet door, the projection of the refrigerant leakage detection sensor is not higher than an upper edge of the projection of the second opening.

3. The air handling unit according to claim 2, characterized in that: On a projection plane perpendicular to the thickness direction of the cabinet door, the projection of the refrigerant leakage detection sensor is not lower than a lower edge of the projection of the first opening.

4. The air handling unit according to claim 1, characterized in that: The air handling unit further comprises a main water receiving pan, which is connected to the lower end of the heat exchange body, and the refrigerant leakage detection sensor is located on a side close to the main water receiving pan.

5. The air handling unit according to claim 4, characterized in that: The air handling unit further comprises a water receiving structure connected to the refrigerant leakage detection sensor, wherein the water receiving structure is used to guide the condensed water generated by the heat exchanger to the main water receiving pan.

6. The air handling unit according to any one of claims 1 to 5, characterized in that: The air handling unit further comprises an auxiliary water receiving pan, which is connected to one side of the heat exchange body along the left-right direction, and the joint and the refrigerant leakage detection sensor are located on a side close to the auxiliary water receiving pan.

7. The air handling unit according to claim 1, characterized in that: The accommodating cavity is configured to be formed by being recessed from the inner side of the cabinet door in a direction away from the heat exchange body.

8. The air handling unit according to claim 7, characterized in that: The box door comprises a panel and a cover shell, the panel is provided with the second opening, the cover shell is mounted on the panel and covers the second opening, and the accommodating cavity is formed on the inner side of the cover shell.

9. The air handling unit according to claim 8, characterized in that: The cover shell is provided with a first through hole connecting the accommodating cavity and the external space of the air handling unit, the first through hole is used for an external pipeline connected to the joint to pass through, and a sealing ring is installed between the first through hole and the external pipeline.

10. The air handling unit according to claim 8, characterized in that: The housing comprises a pipe plate and an outer cover protruding outward relative to the pipe plate; the pipe plate is provided with a second through hole, and the outer cover covers the second through hole to form the accommodating cavity.

11. The air handling unit according to claim 10, characterized in that: The outer cover comprises a first cover body and a second cover body which are arranged opposite to each other. The first cover body and the second cover body are respectively connected to the pipe plate and enclose to form the accommodating cavity.

12. The air handling unit according to claim 11, characterized in that: At least a portion of the side wall of the first cover body on a side facing the second cover body is provided with a convex strip, and a side wall of the second cover body on a side facing the first cover body is provided with a groove engaged with the convex strip.

13. The air handling unit according to claim 8, characterized in that: The cover shell is an integrally formed part, and comprises a pipe plate portion and an outer cover portion protruding outward relative to the pipe plate portion, and a second through hole is formed at a connection between the outer cover portion and the pipe plate portion.

14. The air handling unit according to claim 10 or 13, characterized in that: On a projection plane perpendicular to the thickness direction of the cabinet door, the projection of the refrigerant leakage detection sensor is not higher than an upper edge of a projection of an inner wall of the second through hole.

15. The air handling unit according to claim 1, characterized in that: The air handling unit further includes a first thermal insulation layer and a second thermal insulation layer, wherein the first thermal insulation layer is arranged on the inner side of the cabinet door, and the second thermal insulation layer is arranged on the inner wall of the accommodating cavity.

Images