Refrigerant leak detection sensor for heat pump and air conditioning apparatus including the same

Abstract

The present disclosure relates to a refrigerant leakage detection sensor (1) for a heat pump, comprising a sensor housing (2), a circuit board (3) enclosed by the sensor housing (2), and a gas sensor (4) mounted on the circuit board (3), the gas sensor (4) having a housing (5), a refrigerant receiving area (6) at an end of the housing (5) and a sensing element in the housing (5), the refrigerant receiving area (6) allowing gaseous refrigerant to enter the housing (5), wherein the housing (5) protrudes through an opening (7) in the sensor housing (2) such that the refrigerant receiving area is arranged outside the sensor housing (2) and the sensing element is positioned inside the sensor housing (2). Furthermore, the disclosure relates to an air conditioning device comprising such a refrigerant leakage detection sensor.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a refrigerant leakage detection sensor for a heat pump. Furthermore, the present disclosure relates to an air conditioning apparatus, in particular to an indoor unit of a heat pump, comprising such a refrigerant leakage detection sensor. BACKGROUND

[0002] As described in EP 3 396 261 A1, an indoor unit of an air conditioning apparatus is described, which comprises a casing, a drain pan provided inside the casing and configured to receive condensate water generated in a load-side heat exchanger, and a refrigerant detection unit 99 provided inside the casing and below the drain pan. The refrigerant detection unit 99 comprises a sensor 200 configured to detect a leakage of a refrigerant, and a sensor cover 230 configured to cover the sensor 200 from a front surface side of the sensor. The sensor cover 230 comprises a top portion 231 arranged above the sensor, and a side surface portion 232 arranged at the front surface side or the side surface side of the sensor and below the top portion 231. The top portion has an eave portion which projects outwardly with respect to the side surface portion, and a plurality of open ports 234a, 234b, 234c configured to introduce air inside the sensor cover 230 are provided in the side surface portion(s) 232. Each of the open ports 234a, 234b, and 234c has a slit-like opening.

[0003] The open ports 234a, 234b, and 234c are provided to enable air or gas to easily pass through the cover 230, thereby ensuring a reliable detection of a gas leakage without time delay. However, the provision of the open ports 234a, 234b, and 234c - allowing air or gas to flow through the cover 230 - inevitably leads to an exposure of the sensor 230, in particular the printed circuit board 210 (PCB), to condensate water and water vapor from humidity in the air. Due to oxidation, a low durability of the sensor 200 and the printed circuit board 210 results.

[0004] Furthermore, since the sensor 200 is provided inside the sensor cover 230, the detection efficiency / reliability is reduced even with the provision of the open ports 234a, 234b, and 234c. In addition, since ambient air continuously flows through the open ports 234a, 234b, 234c, dust can cover the ports over time, leading to a deterioration of the reliability of the gas leakage detection. Moreover, because of the stable air flow through the slits of the open ports 234a, 234b, and 234c, an unpleasant noise can occur, which is particularly undesirable in the case of an indoor unit.

[0005] REFERENCE LIST

[0006] Patent Literature

[0007] [Patent Literature 1] EP 3 396 261 A1 SUMMARY

[0008] In the light of the above, there is a desire to provide a refrigerant leakage detection sensor for a heat pump that gives improved detection efficiency / accuracy and detection reliability while avoiding contact with water vapor and condensed water from the air, thereby improving the durability of the detection sensor.

[0009] This object can be achieved by a refrigerant leakage detection sensor for a heat pump as defined in claim 1 and an air conditioning apparatus, in particular an indoor unit of a heat pump, comprising such a refrigerant leakage sensor as defined in claim 15. Embodiments can be found in the dependent claims, the following description and the drawings.

[0010] According to a first aspect of the present disclosure, a refrigerant leakage detection sensor for a heat pump comprises a sensor housing, a circuit board enclosed by the sensor housing, and a gas sensor mounted on the circuit board. The gas sensor has a housing, a refrigerant receiving area at an end of the housing and a sensing element in the housing, the refrigerant receiving area allowing gaseous refrigerant to enter the housing, wherein the housing protrudes through an opening in the sensor housing such that the refrigerant receiving area is arranged outside the sensor housing and the sensing element is positioned inside the sensor housing.

[0011] Because the refrigerant receiving area of the gas sensor is arranged outside the sensor housing and the sensing element is positioned inside the sensor housing, it is possible to provide a refrigerant leakage detection sensor that gives improved detection efficiency / accuracy and detection reliability while avoiding contact of the sensing element with water vapor and condensed water from the air, thereby improving the durability of the detection sensor.

[0012] Further, by the claimed arrangement, it is possible to have the majority of the housing of the gas sensor covered by the sensor housing, ensuring that the majority of the housing is not directly in contact with water vapor and water. Additionally, because the majority of the air sensor is located inside the sensor housing, the generated heat of the air sensor during operation is almost entirely retained inside the sensor housing, forming a so-called "heat capsule" or "heat pocket" that covers the gas sensor, in particular the circuit board of the gas sensor. Furthermore, the "heat capsule" or "heat pocket" creates the advantage that the temperature in the vicinity of the sensor is increased, thereby reducing the humidity in the surroundings of the sensor. Also, because the refrigerant receiving area is located outside the sensor housing, which means direct contact with the surrounding air, it is possible to enhance the detection sensitivity and detection reliability.

[0013] Additionally, the term "refrigerant receiving area" in connection with a "gas sensor" is defined in the present disclosure as an area or surface of the housing of the gas sensor, in particular of the end or top of the housing, which is provided with a penetration for refrigerant, in particular gaseous refrigerant, to penetrate the receiving area and thereby enter the housing of the gas sensor. In this way, on the one hand, the refrigerant receiving area enables gaseous refrigerant to enter the housing and thereby reach the sensor element arranged within the housing, on the other hand, the refrigerant receiving area is able to prevent water vapor and water, in particular condensed water, from entering the housing. In other words, the refrigerant receiving area, which is preferably a membrane, is impermeable to liquids such as water vapor and water, but permeable to air. Alternatively, the refrigerant receiving area can comprise an upper layer made of a silicon dioxide filter and a lower layer made of activated carbon.

[0014] Furthermore, the term "sensor element" is defined in the present disclosure as any device capable of detecting a physical parameter such as temperature, pressure or humidity or electrical resistance, in particular any device capable of detecting the presence of gaseous refrigerant (gas sensor).

[0015] According to a further aspect of the present disclosure, the sensor housing can have a mounting surface for mounting the sensor housing to a structural element, wherein the opening is provided in a first wall, preferably a bottom wall, of the sensor housing and the housing of the gas sensor protrudes towards the mounting surface.

[0016] Furthermore, the sensor housing can comprise a strut connecting the sensor housing to the mounting surface, whereby a passage having opposite open ends is formed between the first wall and the strut.

[0017] In this way, a sensor housing having a passage or space can be provided, through which air surrounding the sensor housing can easily flow, in particular past the refrigerant receiving area of the gas sensor. Accordingly, gaseous refrigerant can move more freely around the sensor housing and more easily come into contact with the gas sensor. Thus, a faster and more efficient detection of leaking refrigerant can be achieved.

[0018] Furthermore, a lip can be provided at the free edge of the outer circumference of the first wall, which lip protrudes towards the mounting surface. In a standard mounting position of the refrigerant detection sensor, the lip of the first wall or body of the sensor housing protrudes downwards, whereby the lip helps to avoid any dripping or condensed water from entering the sensor housing or reaching the refrigerant receiving area through the opening in the sensor housing. It ensures that dripping water falling on top of the sensor housing only flows down along the side walls of the housing and does not soak towards the bottom wall of the sensor housing.

[0019] Accordingly, the first portion of the first wall having the opening is arranged further away from the mounting surface than the second portion of the first wall. In this way, the overall height of the sensor housing is reduced in the area of the gas sensor, thereby reducing the space around the gas sensor within the sensor housing. With the reduced space, the temperature within the housing, in particular close to the sensor element, can be increased.

[0020] According to a further aspect of the present disclosure, the first portion of the first wall and the second portion of the first wall are connected by a slanted surface. By the slanted surface, the ambient air flowing through the passage below the bottom wall can flow more easily, thereby enhancing the air circulation effect of the passage.

[0021] The refrigerant leakage detection sensor for a heat pump can further comprise a through-hole provided in the second wall, preferably the side wall, of the sensor housing for the insulation cable to be connected to the circuit board to pass through the second wall, in particular in a sealed manner.

[0022] Furthermore, the through-hole in the second wall tapers towards the outside of the sensor housing. Since the cable is usually covered or insulated by a plastic tube wrapped by a cable tie, the sealing effect between the through-hole of the sensor housing and the cable can be improved, thereby preventing water vapor and condensation water from entering the interior of the sensor housing. In case of rapid temperature changes of the refrigerant leakage detection sensor, additional sealing material / insulation elements can be provided to improve the efficiency of the heat pocket generation.

[0023] According to a further aspect, a socket or a plug can be mounted on the circuit board for releasably connecting a plug or a socket at the end of the insulation cable, wherein the socket or the plug on the circuit board is accommodated in the sensor housing, and preferably on the side of the circuit board facing the first wall.

[0024] Furthermore, the second wall having the through-hole can be located closer to the second portion of the first wall than to the first portion of the first wall.

[0025] Furthermore, the housing of the gas sensor can protrude through the opening of the sensor housing in a sealed manner. In this way, water vapor or condensation water can be further prevented from entering the sensor housing.

[0026] The sensor housing of the refrigerant leakage detection sensor can comprise a main body and a cover detachably fixed to the main body, wherein the mating surfaces of the main body and the cover overlap in a direction perpendicular to the fixing direction of the sensor housing when the cover is fixed to the main body. Since the mating surface of the cover encloses the mating surface of the main body at the outer circumference, the tightness of the sensor housing can be enhanced. Furthermore, in the standard installation position of the refrigerant leakage detection sensor, the outer mating surface of the cover is further downward in the fixing direction and then the inner mating surface of the main body is further downward in particular as an interface between the main body and the lip, the water vapor and water are prevented from entering the sensor housing.

[0027] Furthermore, the corners of the sensor housing can be rounded, wherein the radius of curvature of the rounded corners is preferably at least 2 mm. Thereby, any unpleasant whistling noise caused by the air flowing around the sensor housing can be avoided.

[0028] According to a further aspect of the present disclosure, a circuit board can be arranged in the sensor housing, preferably parallel to the first wall, the circuit board being further away from the first wall than from a third wall, the third wall being opposite to the first wall, preferably the top wall.

[0029] Additionally, the sensor housing can be at least partially thermally insulated. The thermal insulation can be achieved by a thermal insulation, which in particular can be arranged at the top wall and the bottom wall of the sensor housing. The thermal insulation can be made of an elastic material, for example polyethylene foam. Thereby, the thermal insulation of the sensor housing, in particular of the gas sensor, can be enhanced, whereby the temperature within the sensor housing can be increased. Since the temperature within the sensor housing, in particular in the vicinity of the gas sensor, can be further increased, the likelihood of the water vapor or humid air within the sensor housing reaching the dew point can be significantly reduced.

[0030] When the thermal insulation is provided, the thermal insulation is preferably provided with an opening, through which the housing of the gas sensor at least partially protrudes, in particular in a sealed manner. The sealing can be achieved by crimping the housing into the thermal insulation, in particular when the thermal insulation is formed of an elastic material.

[0031] Moreover, according to a further aspect of the present disclosure, the housing is sealed, preferably airtight and / or watertight.

[0032] The present disclosure also provides an air conditioning apparatus, in particular an indoor unit of a heat pump, comprising a refrigerant leakage detection sensor as described above.

[0033] The refrigerant leakage detection sensor for a heat pump can be used for an air conditioning apparatus, particularly an indoor unit of a heat pump. Accordingly, the further features disclosed in connection with the above refrigerant leakage detection sensor can also be applied to the air conditioning apparatus, particularly the indoor unit of a heat pump, of the present disclosure. The same refrigerant leakage detection sensor can be used for the air conditioning apparatus, particularly the indoor unit of a heat pump, in reverse. BRIEF DESCRIPTION OF DRAWINGS

[0034] The present disclosure can be better understood, and its numerous objects, advantages, and features will be appreciated, by reference to the following detailed description, with the

[0035] [ Figure 1 ]

[0036] Figure 1 is a schematic view illustrating a conventional refrigerant detection unit of an air conditioning apparatus;

[0037] [ Figure 2 ]

[0038] Figure 2 is a three-dimensional schematic view of a refrigerant leakage detection sensor according to an aspect of the present disclosure;

[0039] [ Figure 3 ]

[0040] Figure 3 is a cross-sectional view of the refrigerant leakage detection sensor illustrated in Figure 2

[0041] [ Figure 4 ]

[0042] Figure 4 is a three-dimensional schematic view of the cross-sectional view illustrated in Figure 3

[0043] [ Figure 5 ]

[0044] Figure 5 is a cross-sectional view of an insulated cable of a refrigerant leakage detection sensor according to an aspect of the present disclosure; and

[0045] [ Figure 6 ]

[0046] Figure 6 is a three-dimensional schematic view of a refrigerant leakage detection sensor according to another aspect of the present disclosure. DETAILED DESCRIPTION

[0047] ​​Several embodiments of the present disclosure will now be described with reference to the drawings. It will be apparent to those skilled in the art of air conditioning devices in light of the present disclosure that the following description of embodiments is provided for illustration only and is not intended to limit the present disclosure as defined by the appended claims.

[0048] Figure 1 is a schematic view showing a conventional refrigerant detection unit 99 of an air conditioning device. As shown, the refrigerant detection unit 99 includes a sensor 200, a mounting plate, and a sensor cover 230. The mounting plate is arranged at the rear surface side of the sensor 200. The sensor cover 230 covers the sensor 200 from the front surface side and encloses the sensor 200 together with the mounting plate. The sensor 200 includes a sensor device and a board 210 configured to house the sensor device therein. Also as shown, the sensor cover 230 includes a top portion 231, a side surface portion 232, and a bottom surface portion. The side surface portion 232 includes a front surface portion 232a, a right side surface portion, and a left side surface portion. Further, a plurality of open ports 234a, 234c are formed at the front surface portion, the side surface portion, and the bottom surface portion so as to ensure detectability of a leaked refrigerant, the plurality of open ports 234a, 234c being configured to introduce air through the sensor cover 230 to the inside of the sensor cover 230. Figure 1 Figure 1

[0049] Figure 2 is a three-dimensional schematic view of a refrigerant leak detection sensor 1 according to an aspect of the present invention. As shown, the refrigerant leak detection sensor 1 includes a sensor housing 2, a circuit board 3 (shown in Figure 2 Figure 3 Figure 3

[0050] Figure 2 It can also be taken from

[0051] Further, in order to better illustrate the position of the gas sensor 4 within the sensor housing 2, the refrigerant leak detection sensor 1 is shown in Figure 2 ​​​​​​is shown upside down. This means that the mounting surface 8, which is used to mount the sensor housing 2 to an external structural element, is shown at the top of the sensor housing 2. However, the mounting surface 8 is normally located below the sensor housing. In other words, in the usual installation situation of the refrigerant leakage detection sensor 1, the sensor is rotated by 180 degrees as shown in Figure 3 .

[0052] Figure 3 is Figure 2 a sectional view of the refrigerant leakage detection sensor 1 shown in Fig. 1. By providing a sectional view of the sensor 1, it is possible to see the arrangement of the gas sensor 4 and the associated elements within the sensor housing 2. As shown in Figure 3 , the sensor housing 2 comprises a main body 16 and a cover 17, the main body 16 being located in the lowermost part of the sensor housing 2 in the standard installation position of the sensor. The cover 17 is detachably fixed to the main body 16, wherein the mating surfaces of the main body 16 and the cover 17 overlap in a direction perpendicular to the direction of the fixing. In Figure 3 , the direction of the fixing is vertical, and therefore the mating surfaces of the main body 16 and the cover 17 overlap within the horizontal plane.

[0053] In Figure 3 the refrigerant leakage detection sensor 1 shown in Fig. 1, the mating surface of the cover 17 is arranged outside the mating surface of the main body 16, meaning that the mating surface of the cover 17 surrounds the mating surface of the main body 16, in particular over the entire outer circumference.

[0054] The circuit board 3 of the gas sensor 4 is arranged within the sensor housing 2 and parallel to the first wall 2a of the sensor 2. In Figure 3 the standard installation position of the sensor 1 shown in Fig. 1, the first wall 2a is the bottom wall of the sensor housing 2 and is located on the side of the mounting surface 8. The first wall 2a is provided with an opening 7, through which the housing 5 of the gas sensor 2 protrudes towards the mounting surface 8.

[0055] Furthermore, as shown in Figure 2 and Figure 4 , the sensor housing 2 is provided with two struts 9, which connect the sensor housing 2 and the mounting surface 8. In other words, the mounting surface(s) 8 is / are arranged at the end face of the strut(s) 9. The struts 9 are arranged in such a way that they form a passage with opposite open ends between the two struts 9 and the first wall 2a.

[0056] It is also obtained from Figure 3 and Figure 4 that the sensor housing 2, in particular the main body 16, is arranged at the free edge of the outer circumference of the first wall 2a, which is part of the lip 10. The lip 10 is formed in such a way that it protrudes towards the mounting surface 8.

[0057] Figure 3 Also shown is a circuit board 3 which is arranged in the sensor housing 2 parallel to the first wall 2a and further away from the first wall 2a than from the third wall 2c, in Figure 3 The standard installation position of the sensor 1 shown is such that the third wall 2c is the top wall opposite the first wall 2a.

[0058] Figure 4 is Figure 3 a three-dimensional representation of the sectional view shown in Figure 4 (see also Figure 3 ) that a first portion of the first wall 2a is arranged further away from the installation surface than a second portion of the first wall 2a, the first portion of the first wall 2a being Figure 4 the left portion of the first wall 2a in Figure 4 , the second portion of the first wall 2a being Figure 4 the right portion of the first wall 2a in . Accordingly, the overall height of the sensor housing 2 is reduced on the side of the sensor housing 2 where the gas sensor 3 is located. Also as shown in

[0059] Figures 2 to 4 The sensor housing 2 of the refrigerant detection sensor 1 shown in Figures 2 to 5 is also provided with a through-hole 12 which is located in the second wall 2b of the sensor housing 2, the second wall 2b being a side wall of the sensor housing 2. The through-hole 12 is required for the insulation cable 13 to pass into the sensor housing. In the embodiment shown in , the insulation cable 13 is provided at its end located within the sensor housing 2 with a plug 15 which can be inserted into a socket 14 which is mounted on the circuit board 3, whereby the insulation cable 13 can be connected to the circuit board 3.

[0060] Figure 5 is a sectional view showing the insulation cable 13 of the expanded refrigerant leak detection sensor 1. As can be seen in Figure 5 , the through-hole 12 in the first wall 2b of the sensor housing 2 is formed in such a way that it tapers towards the outside of the sensor housing 2. Furthermore, it is advantageous if the insulation cable 13 passes through the through-hole 12 in a sealed manner. Figure 5 Also shown is that the socket 14 is accommodated on the circuit board 3 and on the side of the circuit board 3 which faces the first / bottom wall 2a. Moreover, as is shown in particular in Figure 4 , the second wall 2b with the through-hole 12 is located closer to the second portion of the first wall 2a than to the first portion of the first wall 2a.

[0061] Figure 6is a three-dimensional schematic view of a refrigerant leak detection sensor 1 according to another aspect of the present application. The refrigerant leak detection sensor 1 shown corresponds essentially to the refrigerant leak detection sensor 1 described above according to the first aspect of the present application, except that in the sensor 1 shown, the sensor housing 2 is additionally provided with an insulation 20 which locally thermally insulates the sensor housing 2. Figures 2 to 5 The refrigerant leak detection sensor 1 shown corresponds essentially to the refrigerant leak detection sensor 1 described above according to the first aspect of the present application, except that in the sensor 1 shown, the sensor housing 2 is additionally provided with an insulation 20 which locally thermally insulates the sensor housing 2. Figure 6 The refrigerant leak detection sensor 1 shown corresponds essentially to the refrigerant leak detection sensor 1 described above according to the first aspect of the present application, except that in the sensor 1 shown, the sensor housing 2 is additionally provided with an insulation 20 which locally thermally insulates the sensor housing 2.

[0062] The insulation 20 is provided with an opening 21 through which the housing 5 of the gas sensor 4 locally protrudes. In the embodiment shown, it is preferred that the housing 5 protrudes through the opening 21 in a sealed manner, so that the housing 5 can protrude through the opening 7 of the sensor housing 2 in particular not with a gap in a sealed manner. The sealing between the insulation 20 and the housing 5 of the gas sensor 4 can be achieved by crimping, which is particularly advantageous or easy to achieve in the case that the insulation 20 is made of an elastic material such as polyethylene foam.

[0063] [LIST OF REFERENCE NUMERALS]

[0064] 1 refrigerant leak detection sensor

[0065] 2 sensor housing

[0066] 2a first wall (bottom wall)

[0067] 2b second wall (side wall)

[0068] 2c third wall (top wall)

[0069] 3 circuit board (PCB)

[0070] 4 gas sensor

[0071] 5 housing (of the gas sensor)

[0072] 6 refrigerant receiving area

[0073] 7 opening (in the sensor housing)

[0074] 8 mounting surface(s)

[0075] 9 strut

[0076] 10 lip(s)

[0077] 12 through hole (in the side wall)

[0078] 13 insulated cable

[0079] 14 socket or plug

[0080] 15 plug or socket

[0081] 16 body

[0082] 17 cover

[0083] 20 thermal insulation

[0084] 21 opening (in the thermal insulation)

Claims

1. A refrigerant leak detection sensor (1), said refrigerant leak detection sensor (1) for use in a heat pump, comprising: Sensor housing (2); The circuit board (3) is surrounded by the sensor housing (2); as well as A gas sensor (4) is mounted on the circuit board (3). The gas sensor (4) has a housing (5), a refrigerant receiving area (6) at an end of the housing (5), and a sensing element in the housing (5). The refrigerant receiving area (6) allows gaseous refrigerant to enter the housing (5). The housing (5) protrudes through an opening (7) in the sensor housing (2), such that the refrigerant receiving area (6) is located outside the sensor housing (2), and the sensing element is located inside the sensor housing (2). The sensor housing (2) has a mounting surface (8) for mounting the sensor housing (2) to a structural element, and the opening (7) is provided in the first wall (2a) of the sensor housing (2). The sensor housing (2) includes two supports (9) that connect the sensor housing (2) to the mounting surface (8), thereby forming a passage with opposing open ends through the first wall (2a) and the two supports (9).

2. The refrigerant leak detection sensor (1) according to claim 1, characterized in that, The housing (5) of the gas sensor (4) protrudes toward the mounting surface (8).

3. The refrigerant leak detection sensor (1) according to claim 1 or claim 2, characterized in that, A lip (10) is provided on the free edge of the outer periphery of the first wall (2a), the lip (10) protruding toward the mounting surface (8).

4. The refrigerant leak detection sensor (1) according to any one of claims 1 to 3, characterized in that, The first portion of the first wall (2a) having the opening (7) is arranged further away from the mounting surface than the second portion of the first wall (2a).

5. The refrigerant leak detection sensor (1) according to claim 4, characterized in that, The first portion of the first wall (2a) and the second portion of the first wall (2a) are connected by an inclined surface.

6. The refrigerant leak detection sensor (1) according to any one of claims 1 to 5, characterized in that, A through hole (12) is provided on the second wall (2b) of the sensor housing (2), the through hole (12) being used for an insulated cable (13) to be connected to the circuit board to pass through the second wall (2b) in a sealed manner.

7. The refrigerant leak detection sensor (1) according to claim 6, characterized in that, The through hole (12) in the second wall (2b) gradually tapers outward toward the sensor housing (2).

8. The refrigerant leak detection sensor (1) according to claim 6 or claim 7, characterized in that, A socket (14) or plug is mounted on the circuit board (3) for releasably connecting to a plug (15) or socket at the end of the insulated cable (13), wherein the socket (14) or plug on the circuit board (3) is housed in the sensor housing (2) and is housed on the side of the circuit board (3) facing the first wall (2a).

9. The refrigerant leak detection sensor (1) according to claim 4 or claim 5, characterized in that, A through hole (12) is provided in the second wall (2b) of the sensor housing (2). The through hole (12) is used for an insulated cable (13) to be connected to the circuit board to pass through the second wall (2b) in a sealed manner. The second wall (2b) having the through hole (12) is located closer to the first wall (2a) than the first portion of the first wall (2a).

10. The refrigerant leak detection sensor (1) according to any one of claims 1 to 9, characterized in that, The housing (5) of the gas sensor (4) protrudes through the opening (7) of the sensor housing (2) in a sealed manner.

11. The refrigerant leak detection sensor (1) according to any one of claims 1 to 10, characterized in that, The sensor housing (2) includes a body (16) and a cover (17) detachably fixed to the body (16), wherein the mating surfaces of the body (16) and the cover (17) overlap in a direction perpendicular to the fixing direction.

12. The refrigerant leak detection sensor (1) according to any one of claims 1 to 11, characterized in that, The circuit board (3) is arranged inside the sensor housing (2) and parallel to the first wall (2a). The circuit board (3) is further away from the first wall (2a) than from the third wall (2c), which is opposite to the first wall (2a).

13. The refrigerant leak detection sensor (1) according to any one of claims 1 to 12, characterized in that, The sensor housing (2) is at least partially thermally insulated by an insulating element (20).

14. An air conditioning device, the air conditioning device comprising a refrigerant leak detection sensor (1) according to any one of claims 1 to 13.

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