Pump shell assembly, drainage pump and refrigeration equipment

Abstract

The utility model discloses a pump shell assembly, a drainage pump and refrigeration equipment, and relates to the technical field of drainage pumps. Wherein the pump shell assembly is provided with an air cavity, at least one first air passing channel and at least one second air passing channel, the first air passing channel is used for communicating the air cavity with the pump body cavity, and the second air passing channel is used for communicating the air cavity with the outside; the total flow area of all the first air passing channels is S1, the total flow area of all the second air passing channels is S2, and the minimum value of S1 and S2 is not larger than 180 mm < 2 >. According to the technical scheme, the noise of the whole draining pump can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of drainage pumps, in particular to a pump casing assembly, a drainage pump and refrigeration equipment. Background Art

[0002] Refrigeration equipment such as air conditioners will produce condensed water when in operation. The condensed water will collect in the water collection pan and be discharged through the drain pump.

[0003] For performance reasons, drainage pumps typically incorporate an air chamber within the pump casing that connects the pump body cavity to the atmosphere. This creates a negative pressure when the impeller rotates, creating water suction. However, the noise generated by the impeller during operation is easily transmitted from the air chamber to the outside, resulting in a relatively noisy drainage pump. Utility Model Content

[0004] The main purpose of the utility model is to provide a pump casing assembly, which is intended to reduce the noise of a drainage pump during operation.

[0005] To achieve the above-mentioned object, the pump housing assembly proposed in the present invention is provided with an air cavity, at least one first air passage and at least one second air passage, wherein the first air passage is used to connect the air cavity and the pump body cavity, and the second air passage connects the air cavity with the outside world;

[0006] The total flow area of ​​all the first air passages is S1, and the total flow area of ​​all the second air passages is S2. The minimum value of S1 and S2 is not greater than 180 mm. 2 .

[0007] In one embodiment of the present application, the minimum value of S1 and S2 is not greater than 9 mm. 2 .

[0008] In one embodiment of the present application, the pump housing assembly includes:

[0009] a bottom plate, wherein the first air passage is provided on the bottom plate, and the air cavity and the pump body cavity are provided on opposite sides of the bottom plate; and

[0010] The enclosure is arranged around the periphery of the bottom plate, and the second air passage is arranged on the enclosure.

[0011] In one embodiment of the present application, the system further includes at least one baffle disposed on the bottom plate, wherein the baffle is located on the air flow path from the first air passage to the second air passage.

[0012] In one embodiment of the present application, the at least one baffle divides the air cavity into at least two sub-cavities, one of the sub-cavities is connected to the first air passage, and the other sub-cavity is connected to the second air passage.

[0013] The baffle is provided with at least one third air passage communicating with two adjacent sub-cavities.

[0014] In one embodiment of the present application, the third air passage and the second air passage on the baffle plate close to the enclosure plate are staggered.

[0015] In one embodiment of the present application, the first air passage is located in the middle of the bottom plate, and the baffle is disposed around the first air passage.

[0016] In one embodiment of the present application, the baffle includes a plurality of sub-plates, and the plurality of sub-plates are arranged at intervals around the first air passage; and a third air passage is formed between two adjacent sub-plates.

[0017] In one embodiment of the present application, the enclosure is provided with a second air passage, and the baffle close to the enclosure is provided with a third air passage. The second air passage and the third air passage are respectively located on opposite radial sides of the bottom plate.

[0018] In one embodiment of the present application, the pump housing assembly includes at least two layers of baffles, and the third air passages on two adjacent layers of baffles are staggered.

[0019] In one embodiment of the present application, a mounting boss for mounting a motor is provided at one end of the enclosure facing away from the base plate, and the axial height between the mounting boss and the base plate is defined as L. The distance between the lower edge of the second air passage and the base plate is D, satisfying D≤0.1L.

[0020] In one embodiment of the present application, a distance D between a lower edge of the second air passage and the bottom plate is 0.

[0021] To achieve the above objectives, the present application also provides a drainage pump, comprising:

[0022] The pump casing assembly described above;

[0023] a motor mounted on the pump housing assembly; and

[0024] A pump body assembly is connected to the pump housing assembly to form a pump body cavity, and the pump body assembly is drive-connected to the motor.

[0025] To achieve the above objectives, the present application also provides a refrigeration device, including the above drainage pump.

[0026] In the pump casing assembly of the present utility model, the pump casing assembly is provided with an air cavity, a first air passage and a second air passage. The first air passage connects the air cavity and the pump body cavity, and the second air passage connects the air cavity with the outside world, so that the pump body cavity can be connected with the outside atmosphere through the first air passage, the air cavity and the second air passage. When the impeller in the pump body cavity rotates, a negative pressure can be formed in the pump body cavity to improve the water absorption and drainage capacity and enhance the performance of the pump. By making the minimum value of the total flow area S1 of the first air passage and the total flow area S2 of the second air passage not greater than 180mm 2 , so that the noise will pass through at least one channel with a total flow area of ​​no more than 180mm in the process of being transmitted outwards. 2 The air passage can increase the resistance to the transmission of noise outward, so that more noise is consumed in the pump housing assembly and the transmission of noise outward is reduced, thereby achieving the purpose of reducing the noise of the entire machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0028] Figure 1 This is a structural diagram of an embodiment of a drainage pump of the present utility model;

[0029] Figure 2 This is a structural diagram of an embodiment of a pump casing assembly of the present utility model;

[0030] Figure 3 for Figure 2 A schematic cross-sectional view of an embodiment;

[0031] Figure 4 A top view of the structure of an embodiment of the second air passage arrangement position in the pump housing assembly of the present invention;

[0032] Figure 5 for Figure 4 Appearance diagram of the embodiment;

[0033] Figure 6 A top view of another embodiment of the arrangement position of the second air passage in the pump housing assembly of the present invention;

[0034] Figure 7 for Figure 6 Appearance diagram of the embodiment.

[0035] Description of Figure Numbers:

[0036]

[0037]

[0038] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0041] At the same time, the meaning of "and / or" or "and / or" appearing in the full text includes three options. Taking "A and / or B" as an example, it includes option A, or option B, or an option in which both A and B are satisfied.

[0042] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0043] The present invention proposes a pump housing assembly, which is used in a drainage pump and is intended to reduce the noise of the drainage pump during operation. Figure 1The drainage pump includes a pump housing assembly, a motor 300, and a pump body assembly 400. The motor 300 is mounted on the pump housing assembly. The pump body assembly 400 is located below the pump housing assembly and forms a pump body cavity B with the pump housing assembly. The impeller is installed in the pump body cavity B and is connected to the motor 300. The rotation of the impeller realizes the water suction and drainage function. The structure of the pump housing assembly will be described below by way of an embodiment.

[0044] like Figures 1 to 3 As shown, one side of the pump housing assembly is the pump body cavity B, and the pump housing assembly is provided with an air cavity A, at least one first air passage 101, and at least one second air passage 102. The first air passage 101 connects the air cavity A with the pump body cavity B, and the second air passage 102 connects the air cavity A with the outside world. The total flow area of ​​all the first air passages 101 is defined as S1, and the total flow area of ​​all the second air passages 102 is defined as S2. The minimum value of S1 and S2 is not greater than 180 mm. 2 .

[0045] In this embodiment, the pump casing assembly has an air cavity A, a first air passage 101, and a second air passage 102. The first air passage 101 connects the air cavity A and the pump body cavity B, and the second air passage 102 connects the air cavity A with the outside world, so that the pump body cavity B can be connected to the outside atmosphere through the first air passage 101, the air cavity A, and the second air passage 102, thereby achieving pressure balance inside and outside the pump casing. When the impeller in the pump body cavity B rotates, a negative pressure can be formed in the pump body cavity B, thereby improving the water suction and drainage capacity and enhancing the performance of the pump. Since the pump cavity B is connected to the outside world, when the drainage pump is working, the noise generated in the pump cavity B (the noise generated by the rotation of the impeller, the sound of water flow, etc.) can easily be transmitted to the outside world through the first air passage 101, the air cavity A and the second air passage 102, resulting in a relatively large noise of the whole machine. Therefore, in this embodiment, the total flow area S1 of the first air passage 101 and the total flow area S2 of the second air passage 102 are limited by setting the minimum value of the total flow area S1 of the first air passage 101 and the total flow area S2 of the second air passage 102 to no more than 180 mm. 2 , so that the noise will pass through at least one channel with a total flow area of ​​no more than 180mm in the process of being transmitted outwards. 2 The air passage can increase the obstruction of noise transmission to the outside, so that more noise is consumed in the pump housing assembly and the noise transmission to the outside is reduced, thereby achieving the purpose of reducing the noise of the whole machine.

[0046] It can be understood that the air cavity A can be a roughly closed cavity formed by the pump body assembly itself, which is connected to the outside atmosphere through the second air passage 102; or, it can be a groove structure with an opening formed on the pump body assembly, and the groove structure is sealed by installing a motor 300 at the opening to form a roughly closed air cavity A; or, it can be some other type of structure, etc., and the specific form of the air cavity A is not limited here.

[0047] It should be noted that the number of first air passages 101 can be one, two, or more. The total flow area of ​​all first air passages 101 is S1. It can be understood that when there is one first air passage 101, the total flow area S1 of all first air passages 101 is the flow area of ​​the first air passage 101; when there are two or more first air passages 101, the total flow area S1 of all first air passages 101 is the sum of the flow areas of the two or more first air passages 101.

[0048] The number of second air passages 102 may be one, two, or more. The total flow area of ​​all second air passages 102 is S2. It can be understood that when there is one second air passage 102, the total flow area S2 of all second air passages 102 is the flow area of ​​that one second air passage 102; when there are two or more second air passages 102, the total flow area S2 of all second air passages 102 is the sum of the flow areas of the two or more second air passages 102.

[0049] In practical applications, the total flow area S1 of the first air passage 101 and the total flow area S2 of the second air passage 102 can be the same or different, and the minimum value of the total flow area S1 of the first air passage 101 and the total flow area S2 of the second air passage 102 is not greater than 180 mm. 2 , then when S1 and S2 are different, the minimum value of S1 and S2 is not greater than 180mm 2 ; When S1 and S2 are the same, then both S1 and S2 are not greater than 180mm 2 .

[0050] Optionally, the shape of the first air passage 101 may be a circular hole, an annular hole, a rectangular hole or some other special-shaped hole structures.

[0051] Optionally, the second air passage 102 may be in the shape of a circular hole, an annular hole, a rectangular hole, or some other special-shaped hole structures.

[0052] In summary, in the pump casing assembly of the technical solution of the present invention, the pump casing assembly is provided with an air cavity A, a first air passage 101 and a second air passage 102. The first air passage 101 connects the air cavity A and the pump body cavity B, and the second air passage 102 connects the air cavity A with the outside world, so that the pump body cavity B can be connected to the outside atmosphere through the first air passage 101, the air cavity A and the second air passage 102, so that when the impeller in the pump body cavity B rotates, a negative pressure can be formed in the pump body cavity B to improve the water absorption and drainage capacity and enhance the performance of the pump; by making the minimum value of the total flow area S1 of the first air passage 101 and the total flow area S2 of the second air passage 102 not greater than 180mm 2 , so that the noise will pass through at least one channel with a total flow area of ​​no more than 180mm in the process of being transmitted outwards. 2 The air passage can increase the resistance to the transmission of noise outward, so that more noise is consumed in the pump housing assembly and the transmission of noise outward is reduced, thereby achieving the purpose of reducing the noise of the entire machine.

[0053] In order to further improve the noise reduction effect, in one embodiment of the present application, the minimum value of the total flow area S1 of the first air passage 101 and the total flow area S2 of the second air passage 102 is not greater than 9 mm. 2 .

[0054] This setting further reduces the minimum value of S1 and S2, thereby further reducing the path of sound transmission from the pump body cavity to the outside, requiring it to pass through at least one air passage with a smaller flow area, thereby further reducing the transmission of noise to the outside and achieving better noise reduction effect.

[0055] Optionally, the minimum value of the total flow area S1 of the first air passage 101 and the total flow area S2 of the second air passage 102 may be 1 mm 2 , 1.5mm 2 , 2mm 2 , 3mm 2 , 3.5mm 2 , 4mm 2 , 4.5mm 2 , 5mm 2 , 6mm 2 , 6.5mm 2 , 7mm 2 , 8mm 2 , 8.5mm 2 , or 9mm 2 wait.

[0056] In one embodiment of the present application, Figures 1 to 4The pump casing assembly includes a base plate 110 and a surrounding plate 120. The air cavity A and the pump body cavity B are arranged on opposite sides of the base plate 110. The first air passage 101 is arranged on the base plate 110; the surrounding plate 120 is arranged around the periphery of the base plate 110, and the second air passage 102 is arranged on the surrounding plate 120.

[0057] In this embodiment, the enclosure 120 is arranged around the periphery of the bottom plate 110, so that the bottom plate 110 forms the bottom wall of the air cavity A, and the pump body cavity B is located below the bottom plate 110. The first air passage 101 is arranged on the bottom plate 110 to facilitate the communication between the pump body cavity B and the air cavity A, so that the communication between the pump body cavity B and the outside world is smoother. Optionally, the first air passage 101 is a through-hole structure that runs through the bottom plate 110 from top to bottom. The second air passage 102 is arranged on the enclosure 120, so that the sound enters the air cavity A from the pump body cavity B below the bottom plate 100 through the first air passage 101, and then is transmitted to the periphery to the enclosure 120, and is transmitted to the outside world through the second air passage 102.

[0058] Further, if Figures 1 to 4 The pump housing assembly further includes at least one baffle 200 disposed on the bottom plate 110 . The baffle 200 is located on the air flow path from the first air passage 101 to the second air passage 102 .

[0059] By setting a baffle 200 on the bottom plate 110, the baffle 200 is located on the air flow path from the first air passage 101 to the second air passage 102. On the one hand, it can block the sound from being transmitted outward, and on the other hand, it can reflect the sound to play a certain silencing role, thereby reducing the sound from being transmitted to the outside and achieving the effect of effectively reducing the noise of the entire drainage pump.

[0060] Optionally, the baffle 200 may be one layer, two layers or more layers.

[0061] Specifically, if Figures 1 to 4 At least one baffle 200 divides the air cavity A into at least two sub-cavities A1, one of which is connected to the first air passage 101, and the other is connected to the second air passage 102; the baffle 200 is provided with at least one third air passage 201 connecting the two sub-cavities A1.

[0062] In this embodiment, at least one layer of baffle 200 divides the air cavity A into at least two sub-cavities A1, and the baffle 200 is provided with at least one third air passage 201 connecting two adjacent sub-cavities A1, so that the pump body cavity B can be connected with the outside atmosphere through the first air passage 101, sub-cavity A1, third air passage 201, sub-cavity A1 and second air passage 102, thereby ensuring the drainage performance of the drainage pump. At the same time, the baffle 200 can block sound, extend the sound propagation path, and achieve better noise reduction effect.

[0063] Optionally, the third air passage 201 may be provided with one, two or more third air passages 201. Optionally, the total flow area S3 of all the third air passages 201 may be set to be no greater than 180 mm. 2 , further increasing the obstacles in the noise transmission process and reducing the outward transmission of noise.

[0064] Optionally, the third air passage 201 may be a slot structure provided on the baffle 200 , such as a vertical slot, a horizontal slot or an oblique slot; the third air passage 201 may be provided at the top, middle or bottom of the baffle 200 .

[0065] In order to further improve the noise reduction effect, such as Figures 2 to 3 The third air passage 201 on the baffle 200 near the enclosure 120 is staggered with the second air passage 102. This arrangement can extend the sound propagation path, increase the sound attenuation effect, and reduce the overall noise.

[0066] In one embodiment, the first air passage 101 is located in the middle of the bottom plate 110 , and the baffle 200 is disposed around the first air passage 101 .

[0067] In this embodiment, the first air passage 101 is located in the middle of the base plate 110. It is understood that the first air passage 101 can also be located at the central mounting hole on the base plate 110 for the impeller shaft to pass through. In this case, the first air passage 101 can be formed by the gap between the impeller shaft and the side wall of the central mounting hole. This eliminates the need for a separate first air passage 101, simplifies the overall structural design, and improves production efficiency.

[0068] The baffle 200 is arranged around the first air passage 101, so that the baffle 200 can surround the noise transmitted from the first air passage 101, so that the noise can be reflected by the baffle 200 into the sub-cavity A1 surrounded by the baffle 200 and offset the transmitted noise, thereby increasing the noise transmission loss and reducing the outward transmission.

[0069] It is understandable that the specific structure of the baffle 200 can be determined according to actual conditions. For example, it can be a continuous annular structure, in which case the third air passage 201 can be a slotted structure on the baffle 200; or it can be a plurality of substructures intermittently forming a roughly annular structure, in which case the gap between the two substructures can form the third air passage 201, etc.

[0070] As an example, the baffle 200 includes a plurality of sub-plates 210, which are spaced apart and arranged around the first air passage 101; a third air passage 201 is formed between two adjacent sub-plates 210. Optionally, the sub-plates 210 can be a "V"-shaped plate structure, with the plurality of sub-plates 210 enclosing a generally annular baffle 200. This arrangement can increase the sound reflection surface area, allowing more sound waves to be blocked and reflected by the sub-plates 210, further increasing noise energy loss. Optionally, there can be two, three, or more sub-plates 210, and the number of third air passages 201 can be two or more. In this case, it is sufficient to ensure that any third air passage 201 is staggered with any second air passage 102.

[0071] In one embodiment, a third air passage 201 is provided on the baffle 200 close to the enclosure 120 , and a second air passage 102 is provided on the enclosure 120 . The second air passage 102 and the third air passage 201 are respectively located on opposite radial sides of the bottom plate 110 .

[0072] It is understandable that the number of the second air passage 102 and the third air passage 201 should not be too many. If there are too many, the noise can be easily transmitted to the outside. For this reason, the enclosure 120 is provided with a second air passage 102, and the baffle 200 is provided with a third air passage 201, which can ensure that the pump body cavity B is connected to the outside atmosphere to ensure the performance of the drainage pump, and can also reduce the transmission of noise to the outside, thereby reducing the noise of the entire machine.

[0073] By locating the second air passage 102 and the third air passage 201 on opposite radial sides of the bottom plate 110, the sound needs to travel a longer path after being transmitted from the third air passage 201 before reaching the second air passage 102 on the radially opposite side. This further extends the sound propagation path, increases the noise transmission loss, and achieves a better noise reduction effect.

[0074] In some other embodiments, the pump housing assembly includes at least two layers of baffles 200 , and the third air passages 201 on two adjacent layers of baffles 200 are staggered.

[0075] At least two layers of baffles 200 are arranged in the air cavity A. It can be understood that the at least two layers of baffles 200 are arranged at intervals on the sound propagation path, so as to play a multiple sound blocking role on the sound propagation path; in addition, by staggering the third air passages 201 on the two adjacent layers of baffles 200, the sound propagation path can be further extended, the sound attenuation effect can be increased, and a better noise reduction effect can be achieved.

[0076] In one embodiment of the present application, Figures 4 to 7The end of the enclosure 120 facing away from the base plate 110 is provided with a mounting boss 121 for mounting the motor 300. The axial height between the mounting boss 121 and the base plate 110 is defined as L, and the distance between the lower edge of the second air passage 102 and the base plate 110 is defined as D, satisfying D ≤ 0.1L. In other words, the second air passage 102 is positioned as close to the base plate 110 as possible on the enclosure 120.

[0077] At the moment the drain pump is shut down, the water in the external pipe of the drain pump will quickly flow back into the pump under the action of gravity. Part of the water will flow through the pump body assembly 400 and out of the water inlet, and another part of the water may enter the pump casing assembly through the first air passage 101. For this reason, in this embodiment, the second air passage 102 is arranged close to the bottom plate 110, so that the water in the pump casing assembly is easier to drain, thereby preventing water from surging to the motor 300 and causing damage to the motor 300.

[0078] Preferably, Figure 6 and Figure 7 The distance D between the lower edge of the second air passage 102 and the bottom plate 110 is 0, so that the water in the air cavity A is more easily discharged.

[0079] In some embodiments, the first air passage 101 is located in the middle of the bottom plate 110, the second air passage 102 is located on the enclosure 120, and a baffle 200 is provided between the first and second air passages 101, 102. The baffle 200 is provided with a third air passage 103. Water entering through the first air passage 101 is discharged out of the pump through the third air passage 103 and the second air passage 102. Alternatively, the third air passage 103 can be provided near the bottom of the baffle 200, and the second air passage 102 can be provided near the bottom of the enclosure 120, to quickly drain water from the housing 100.

[0080] Optionally, the second air passage 102 is a groove structure provided on the enclosure 120 , such as a vertical groove, a horizontal groove or an oblique groove.

[0081] The utility model also proposes a drainage pump, such as Figure 1 The drainage pump includes a pump housing assembly, a motor 300, and a pump body assembly 400. The specific structure of the pump housing assembly is similar to that of the above-mentioned embodiments. Since the present drainage pump adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, and will not be described in detail here. Among them, the motor 300 is mounted on the pump housing assembly. The pump body assembly 400 includes a pump housing mounted below the pump housing assembly and an impeller provided on the pump housing. The pump housing and the pump housing assembly are connected to form a pump body cavity B. The impeller is drivingly connected to the motor 300.

[0082] The present invention also provides a refrigeration device including a drainage pump. The specific structure of the drainage pump is similar to that of the aforementioned embodiments. Since the present refrigeration device utilizes all of the technical solutions of all of the aforementioned embodiments, it at least possesses all of the beneficial effects provided by the technical solutions of the aforementioned embodiments, and therefore, no further details are given here. Alternatively, the refrigeration device may be an air conditioner, a refrigerator, a cold chain transport vehicle, or the like, and the drainage pump is used to drain condensed water generated by the refrigeration device.

[0083] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A pump housing assembly, characterized in that: The pump housing assembly is provided with an air cavity, at least one first air passage and at least one second air passage, wherein the first air passage is used to connect the air cavity and the pump body cavity, and the second air passage connects the air cavity with the outside world; The total flow area of ​​all the first air passages is S1, and the total flow area of ​​all the second air passages is S2. The minimum value of S1 and S2 is not greater than 180 mm. 2 .

2. The pump housing assembly according to claim 1, wherein: The minimum value of S1 and S2 is not greater than 9mm 2 .

3. The pump housing assembly according to claim 1, wherein: The pump housing assembly comprises: a bottom plate, wherein the first air passage is provided on the bottom plate, and the air cavity and the pump body cavity are provided on opposite sides of the bottom plate; and The enclosure is arranged around the periphery of the bottom plate, and the second air passage is arranged on the enclosure.

4. The pump housing assembly according to claim 3, wherein: The invention also includes at least one baffle plate provided on the bottom plate, wherein the baffle plate is located on the air flow path from the first air passage to the second air passage.

5. The pump housing assembly according to claim 4, wherein: The at least one baffle divides the air cavity into at least two sub-cavities, one of the sub-cavities is communicated with the first air passage, and the other sub-cavity is communicated with the second air passage; The baffle is provided with at least one third air passage communicating with two adjacent sub-cavities.

6. The pump housing assembly according to claim 5, wherein: The third air passage and the second air passage on the baffle plate close to the enclosure plate are staggered.

7. The pump housing assembly according to claim 6, wherein: The first air passage is located in the middle of the bottom plate, and the baffle is arranged around the first air passage.

8. The pump housing assembly according to claim 7, wherein: The baffle includes a plurality of sub-plate bodies, and the plurality of sub-plate bodies are arranged around the first air passage at intervals; a third air passage is formed between two adjacent sub-plate bodies.

9. The pump housing assembly according to claim 7, wherein: The enclosure is provided with a second air passage, and the baffle close to the enclosure is provided with a third air passage. The second air passage and the third air passage are respectively located on two opposite radial sides of the bottom plate.

10. The pump housing assembly according to claim 5, wherein: The pump housing assembly includes at least two layers of baffles, and the third air passages on two adjacent layers of baffles are staggered.

11. The pump housing assembly according to any one of claims 3 to 10, wherein: An end of the enclosure facing away from the base plate is provided with a mounting boss for mounting the motor. The axial height between the mounting boss and the base plate is defined as L, and the distance between the lower edge of the second air passage and the base plate is D, satisfying D≤0.1L.

12. The pump housing assembly according to claim 11, wherein A distance D between the lower edge of the second air passage and the bottom plate is 0.

13. A drainage pump, characterized in that: include: The pump housing assembly according to any one of claims 1 to 12; a motor mounted on the pump housing assembly; as well as A pump body assembly is connected to the pump housing assembly to form a pump body cavity, and the pump body assembly is drive-connected to the motor.

14. A refrigeration device, characterized in that: Comprising the drain pump as claimed in claim 13.

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