Drainage structure for pump and pump

Abstract

The utility model relates to a drainage structure for a pump and the pump, the drainage structure for the pump comprises a pump shell, one or more layers of cavities are formed in the pump shell, drainage holes are formed in the cavity wall of each layer of cavity, and when the cavity has two or more layers, the drainage holes in the cavity wall of each layer are right opposite; the drainage screwed plugs are arranged in the drainage holes in a penetrating mode from inside to outside, plugging structures are arranged at the positions, corresponding to the drainage holes, of the drainage screwed plugs, and the plugging structures are used for plugging the drainage holes opposite to the plugging structures from inside to outside; the locking assembly is used for locking or unlocking the drainage screwed plug from the outer side of the pump shell so that the drainage screwed plug can open or close the drainage hole. According to the scheme, the drainage screwed plug can be tightly attached to the cavity wall in the pump shell under the water pressure in the pump, the problem of water leakage caused by outward displacement and looseness of the drainage screwed plug due to the water pressure can be fundamentally solved, the water pressure in the pump shell can be converted into auxiliary extrusion force, the sealing performance between the plugging structure and the drainage hole is assisted and enhanced, and the service life of the drainage screwed plug is prolonged. And the stability and reliability are improved.

Description

Technical Field

[0001] The present application relates to the technical field of pumps, and in particular to a drainage structure and a pump for a pump. Background Art

[0002] When a pump is out of service for a long period of time, the water in the pump body is usually drained to prevent water accumulation inside the pump body, thereby avoiding damage to the pump body caused by corrosion, freezing and expansion. The water inside the pump body is mainly discharged by the drainage structure set on the pump body.

[0003] Currently, the drainage structure of a pump body mainly uses a sealing plug, which is sealed in the drainage hole of the pump body. When the water inside the pump body needs to be drained, the sealing plug can be removed. However, the pressure inside the pump is usually relatively high, especially in multi-stage pumps. The high head leads to higher pressure inside the pump. Excessive pressure can squeeze the sealing plug outward, causing it to loosen and leak. The vibration caused by the operation of the pump also accelerates the possibility of leakage.

[0004] Current solutions primarily involve manual maintenance after a leak occurs, such as increasing the torque on the sealing plug and replacing the seal ring. However, due to vibrations and increased internal pressure during operation, leaks can persist after a period of operation. Some even apply sealant to the threads of the sealing plug, securing it to the pump. While this completely eliminates the leak, it prevents disassembly and makes maintenance extremely inconvenient. Utility Model Content

[0005] Based on this, the utility model provides a drainage structure and a pump for a pump, so as to solve the problem that the sealing plug of the existing water pump is easily loosened due to the water pressure in the pump and the vibration of the water pump, resulting in water leakage of the water pump.

[0006] On the one hand, the utility model provides a drainage structure for a pump, comprising:

[0007] A pump housing, wherein one or more cavities are provided in the pump housing, and drainage holes are provided on the cavity walls of each cavity layer, and when the cavity has two or more layers, the drainage holes on the cavity walls of each layer are directly opposite;

[0008] A drain plug is provided through each of the drain holes from the inside out, and a sealing structure is provided on the drain plug corresponding to each of the drain holes, the sealing structure being used to seal the drain hole opposite to it from the inside out;

[0009] The locking assembly is used to lock or unlock the drain plug from the outside of the pump housing so that the drain plug opens or closes the drain hole.

[0010] In one embodiment, the blocking structure includes a blocking step that can cover the drainage hole opposite thereto.

[0011] In one embodiment, a sealing ring is provided on the side of the blocking step facing the drainage hole opposite thereto and surrounding the drainage hole opposite thereto.

[0012] In one embodiment, the drain plug includes water-passing sections having the same number as the drainage holes, and each of the water-passing sections is inserted into the corresponding drainage hole and has a drainage gap between the water-passing section and the hole wall of the drainage hole.

[0013] In one embodiment, when the cavity has two or more layers, the diameter of the drainage holes on the cavity wall of each layer of the cavity decreases from the inside to the outside, and the diameter of each drainage hole is smaller than the diameter of the blocking step located on its inner side and larger than the diameter of the blocking step located on its outer side; and the distance between two adjacent blocking steps is equal to the distance between the inner ends of two adjacent drainage holes.

[0014] In one embodiment, a plugging head is provided at the inner end of the drain plug, and the plugging step is formed at the connection between the plugging head and the water flow section connected thereto;

[0015] The diameter of each water-passing section decreases from the inside to the outside, and the blocking step is formed at the diameter-changing portion between each two adjacent water-passing sections.

[0016] In one embodiment, the locking assembly includes a locking nut that is screwed onto a portion of the drain plug that extends out of the pump housing.

[0017] In one embodiment, the locking assembly further includes a fixing card detachably connected to the outer side of the pump housing, and the fixing card is used to limit the axial position of the locking nut.

[0018] In one embodiment, a chuck is provided on the outer side of the pump housing at the outer end of the drain hole, the fixing card is detachably connected to the chuck, and the fixing card is provided with a limiting slot that can be buckled with the locking nut and the chuck.

[0019] On the other hand, the present invention further provides a pump, which includes the pump drainage structure of any one of the above embodiments.

[0020] Compared with the prior art, the present invention has at least the following beneficial effects:

[0021] The drainage structure of this pump is achieved by inserting a drain plug from the inside to the outside through the drainage hole of the pump casing, and making the sealing structure of the drain plug seal the drainage hole opposite to it from the inside to the outside. After the circulating water enters the cavity of the pump casing, the strong water pressure can exert an extrusion force from the inside to the outside on the drain plug, so that the sealing structure can be stably attached to the cavity wall inside the pump casing. This can not only fundamentally avoid the leakage problem caused by the drain plug being displaced outward and loosened by the water pressure, but also convert the internal water pressure of the pump casing into an auxiliary extrusion force, so that the high water pressure and vibration of the water pump are converted from unfavorable factors to favorable factors, assist and strengthen the sealing performance between the sealing structure and the drainage hole, and improve stability and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of the pump drainage structure in Example 1;

[0023] Figure 2 This is a schematic diagram of the disassembled structure of the pump drainage structure in Example 1;

[0024] Figure 3 This is a schematic diagram of the structure of the pump drainage structure in Example 1 during drainage;

[0025] Figure 4 This is a left side view of the pump drainage structure in Example 1;

[0026] Figure 5 This is a schematic structural diagram of the pump drainage structure in Example 2;

[0027] Figure 6 This is a schematic diagram of the disassembled structure of the pump drainage structure in Example 2;

[0028] Figure 7 This is a schematic diagram of the drainage structure of the pump in Example 2 during drainage.

[0029] The figure marks in the drawings of the specification include: pump casing 1, cavity 101, drain hole 102, drainage gap 1021, second drain hole 103, first drain hole 104, drain plug 2, sealing structure 201, water flow section 202, sealing step 203, sealing ring 204, second water flow section 205, first water flow section 206, second sealing step 207, first sealing step 208, locking assembly 3, locking nut 301, chuck 302, fixing card 303. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0031] It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the present invention.

[0032] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not intended to limit the conditions under which the present invention can be implemented. Any structural modifications, changes in proportions, or adjustments in sizes should still fall within the scope of the technical contents disclosed in this utility model without affecting the effects and purposes that can be achieved by the present utility model.

[0033] Terms such as "upper," "lower," "left," "right," "center," "longitudinal," "transverse," "horizontal," "inner," "outer," "radial," and "circumferential" used in this specification to indicate positions or locations are based on those shown in the accompanying drawings and are intended solely for ease of description. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] The existing pump body sealing plug is prone to gradually loosening under the action of high water pressure in the pump, causing the water pump to leak. The current solution is mainly to perform manual maintenance after the leakage, increase the torque of the sealing plug, replace the sealing ring, etc., but this method cannot fundamentally solve the leakage problem. As the vibration of the water pump increases and the internal pressure increases, the water pump will still leak after running for a period of time.

[0035] In view of this, an embodiment of the present invention provides a drainage structure for a pump, which includes:

[0036] The pump housing 1 has one or more cavities 101 disposed therein, and drainage holes 102 are provided on the walls of each cavity 101. When the cavity 101 has two or more layers, the drainage holes 102 on the walls of each layer are directly opposite each other.

[0037] A drain plug 2 is provided through each drain hole 102 from the inside out, and a sealing structure 201 is provided on the drain plug 2 corresponding to each drain hole 102. The sealing structure 201 is used to seal the drain hole 102 corresponding thereto from the inside out;

[0038] The locking assembly 3 is used to lock or unlock the drain plug 2 from the outside of the pump housing 1 so that the drain plug 2 opens or closes the drain hole 102 .

[0039] According to the pump drainage structure provided by the embodiment of the present invention, when the water pump needs to be sealed, the drain plug 2 is passed through the drain hole 102 from the inside to the outside, and the sealing structure 201 on the drain plug 2 is sealed on the drain hole 102, and finally the drain plug 2 is locked by the locking component 3, so that the drain hole 102 can be closed by the drain plug 2 to achieve water pump sealing; and when the water pump needs to drain, the drain plug 2 is unlocked by the locking component 3, and then a force from the outside to the inside is applied to the drain plug 2, so that the sealing structure 201 can be separated from the drain hole 102, thereby opening the drain hole 102 for drainage.

[0040] The drainage structure of this pump is achieved by passing the drain plug 2 through the drainage hole 102 of the pump casing 1 from the inside to the outside, and making the sealing structure 201 of the drain plug 2 seal the drainage hole 102 opposite to it from the inside to the outside. After the circulating water enters the cavity 101 of the pump casing 1, the strong water pressure can exert an extrusion force from the inside to the outside on the drain plug 2, so that the sealing structure 201 can be stably attached to the cavity wall of the pump casing 1. This can not only fundamentally avoid the leakage problem caused by the drain plug 2 being displaced outward by the water pressure, but also convert the internal water pressure of the pump casing 1 into an auxiliary extrusion force, so that the high water pressure and vibration of the water pump are converted from unfavorable factors to favorable factors, assisting and strengthening the sealing performance between the sealing structure 201 and the drainage hole 102, and improving stability and reliability.

[0041] The pump drainage structure provided by the embodiment is described in detail below with reference to the accompanying drawings.

[0042] Example 1

[0043] according to Figure 1 A pump drainage structure according to at least one embodiment of the present invention is exemplarily shown, and the pump drainage structure includes: a pump housing 1 , a drainage plug 2 and a locking assembly 3 .

[0044] The pump housing 1 is a housing part of the water pump, and has a cavity 101 for water flow inside. Figure 1 In this embodiment, the pump housing 1 has a cavity 101, and the wall of the pump housing 1 is the wall of the cavity 101. This structure of the pump housing 1 is suitable for a single-stage pump. Figure 2 A drainage hole 102 is provided on the pump casing 1 , which connects the cavity 101 inside the pump casing 1 and the outer space of the pump casing 1 , so that the residual water in the cavity 101 of the pump casing 1 can be discharged outward through the drainage hole 102 .

[0045] See also Figure 1 and Figure 2In this embodiment, the drain plug 2 is inserted into the drain hole 102 from the inside to the outside. In this way, the drain plug 2 blocks the drain hole 102 from the inside to the outside, avoiding the water leakage problem caused by the water pressure squeezing the drain plug 2 outward and causing it to loosen. The internal water pressure of the pump casing 1 is converted into an auxiliary squeezing force, turning it from an unfavorable factor into a favorable factor, assisting and strengthening the sealing performance of the drain plug 2 on the drain hole 102, and improving stability and reliability.

[0046] For details, see Figure 2 The drain plug 2 includes a water passage section 202 and a blocking structure 201, wherein the water passage section 202 is used to connect the blocking structure 201, so as to facilitate the drain plug 2 to be moved from the outside of the pump housing 1 so that the blocking structure 201 blocks or separates from the drain hole 102. For example, see Figure 2 In this embodiment, the water flow section 202 is passed through the drainage hole 102, and the length of the water flow section 202 is greater than the length of the drainage hole 102, so that the inner end of the water flow section 202 extends to the inner side of the cavity 101, while the outer end of the water flow section 202 can extend outward to the outside of the pump casing 1, thereby facilitating the operation of the drain plug 2 from the outside of the pump casing 1.

[0047] For further information, see Figure 3 There is a drainage gap 1021 between the water-passing section 202 and the hole wall of the drainage hole 102. Through the drainage gap 1021, when the blocking structure 201 is not blocked in the drainage hole 102, the water inside the cavity 101 can be discharged outward from the drainage gap 1021, thereby ensuring smooth drainage.

[0048] For example, in Figure 2 In the example shown, the drainage hole 102 is a circular hole, the water flow section 202 is a cylindrical structure, and the diameter of the water flow section 202 is smaller than the diameter of the drainage hole 102. In this way, a drainage gap 1021 is provided between the water flow section 202 and the wall of the drainage hole 102. Of course, in other embodiments, the shapes of the drainage hole 102 and the water flow section 202 can also be other. For example, the drainage hole 102 is a circular hole, the water flow section 202 is a square, and the width and height of the square water flow section 202 are both smaller than the diameter of the drainage hole 102. This can also ensure that the drainage gap 1021 is provided between the water flow section 202 and the wall of the drainage hole 102.

[0049] In this embodiment, the sealing structure 201 is used to seal the drain hole 102 from the inner end thereof to ensure the sealing of the pump housing 1 when the water pump is running. Figure 3 The sealing structure 201 is arranged at the inner end of the water-passing section 202 and is located in the cavity 101. In this way, the sealing structure 201 can be sealed on the inner end of the drainage hole 102 from the inside to the outside, while ensuring the sealing of the pump housing 1, avoiding the problem of loosening of the drainage plug 2 caused by water pressure.

[0050] For details, see Figure 2 In this embodiment, the blocking structure 201 includes a blocking step 203 disposed at the inner end of the water-passing section 202. The blocking step 203 can completely cover the drainage hole 102, thereby blocking the drainage hole 102 from the cavity 101 and achieving a seal. For example, corresponding to the design of the aforementioned circular drainage hole 102, in this embodiment, the blocking step 203 is also a circular structure, and the diameter of the circular blocking step 203 is larger than the diameter of the drainage hole 102. When the blocking step 203 is in close contact with the cavity wall, the drainage hole 102 can be completely covered and blocked. Of course, in other embodiments, the blocking step 203 can also have other shapes, as long as it can ensure that the blocking step 203 can cover and block the drainage hole 102.

[0051] For more details, see Figure 2 In this embodiment, a disc-shaped plugging head is provided at the inner end of the water-passing section 202, and the diameter of the plugging head is larger than the diameter of the water-passing section 202, so that a step is formed at the diameter-changing connection between the water-passing section 202 and the plugging head, which is the plugging step 203.

[0052] For further information, see Figure 2 A sealing ring 204 is provided on the side of the sealing step 203 facing the drainage hole 102, and the sealing ring 204 is designed to surround the outer side of the drainage hole 102. For example, the sealing ring 204 is a circular ring, and the inner diameter of the circular ring is larger than the diameter of the drainage hole 102, so that when the sealing ring 204 is installed on the sealing step 203, the sealing ring 204 can surround the outer side of the drainage hole 102, forming a water barrier in the circumferential direction of the drainage hole 102, thereby improving the sealing performance of the drainage hole 102.

[0053] Specifically, in this embodiment, the sealing ring 204 may be a sealing ring made of rubber material. The rubber material causes the sealing ring 204 to deform after being squeezed and can fit tightly against the wall of the cavity 101, resulting in a better sealing effect.

[0054] Furthermore, in this embodiment, a ring groove for installing the sealing ring 204 can be provided on the side of the sealing step 203 facing the drainage hole 102, and the thickness of the ring groove is smaller than the thickness of the sealing ring 204, so that the sealing ring 204 can be squeezed tightly against the cavity wall to ensure sealing performance.

[0055] In this embodiment, the locking assembly 3 is used to lock or unlock the drain plug 2 from the outside of the pump housing 1, thereby sealing or opening the drain hole 102 to ensure stable operation of the pump and removal of accumulated liquid.

[0056] For details, see Figure 2In this embodiment, the locking assembly 3 includes a locking nut 301, which is screwed onto the portion of the drain plug 2 extending out of the pump housing 1. Specifically, an external thread is provided on the surface of the portion of the water passage section 202 extending out of the water hole, and the locking nut 301 can be screwed onto the threaded section, which is configured as a square. Figure 4 As shown, the locking nut 301 is screwed onto the threaded section. There are holes between the screw hole of the locking nut 301 and the two sides of the external water passage section 202, through which water can be drained. In this way, when installing, after the sealing structure 201 on the drain plug 2 is pressed against the cavity wall, the locking nut 301 is screwed onto the threaded section until the locking nut 301 is tightened. At this time, see Figure 1 , the locking nut 301 is pressed against the outer wall of the pump housing 1, and the locking nut 301 can lock the drain plug 2; on the contrary, when drainage is required, refer to Figure 3 , unscrew the locking nut 301 from the threaded section or loosen it until it is separated from the outer wall of the pump housing 1, and then push the drain plug 2 inward as a whole to open the drain hole 102.

[0057] Furthermore, in this embodiment, the locking assembly 3 further includes a fixing card 303, which is detachably mounted on the outer side of the pump housing 1 and is used to axially limit the locking nut 301. For example, see Figure 2 A chuck 302 is provided on the outside of the pump housing 1 at the outer end of the drain hole 102. The diameter of the chuck 302 is the same as that of the lock nut 301. The fixing clamp 303 is a U-shaped member having a connecting plate and limit plates connected to both ends of the connecting plate. The two limit plates and the connecting plate form a limit slot, and the width of the limit slot is sufficient to allow the lock nut 301 and the chuck 302 to be simultaneously inserted into the limit slot. With this arrangement, when the position of the lock nut 301 needs to be locked, the fixing clamp 303 is snapped onto the lock nut 301 and the chuck 302, and the lock nut 301 can be axially positioned by the limit plates on both sides of the fixing clamp 303.

[0058] For further information, see Figure 2 The limiting plate on the inner side of the fixing card 303 and the chuck 302 are provided with corresponding pin holes, and the pins can be inserted into the pin holes. The pins can ensure the positioning between the fixing card 303 and the pump casing 1, ensure its stability, and then ensure the positioning stability of the locking nut 301 and the drain plug 2.

[0059] In this embodiment, the fixing card 303 can position the locking nut 301 when the drain plug 2 seals the drain hole 102, thereby ensuring the sealing stability of the drain plug 2. Figure 1and can position the locking nut 301 when the drain wire plug 2 is draining, to prevent the water flow from pushing the drain wire plug 2 outward, causing the drain hole 102 to be blocked, to ensure smooth drainage, such as Figure 3 shown.

[0060] It should be noted that, in this embodiment, the directions of “inside” and “end” can be understood as referring to the inside direction of the pump housing 1, i.e. Figure 1 The right direction of the orientation shown, the orientation indication of "outside" can be understood as the outside direction of the pump housing 1, that is, Figure 1 The left direction of the indicated orientation.

[0061] Example 2

[0062] The difference between this embodiment and embodiment 1 is that the number of layers of the cavity 101 in the pump housing 1 of this embodiment is different. Specifically, in this embodiment, two or more layers of cavity 101 are provided in the pump housing 1, for example, Figure 5 The embodiment of the pump casing 1 having inner and outer two-layer cavities 101 is exemplarily shown. This pump casing 1 structure is mostly used for multi-stage pumps. The following is an exemplary description of the pump drainage structure with the cavity 101 in the pump casing 1 being two-layered, with reference to the accompanying drawings.

[0063] In this embodiment, drainage holes are provided on the wall of each cavity 101 of the pump housing 1. Figure 5 In the example, two drainage holes are provided on the pump housing 1, wherein the drainage hole of the inner cavity 101 is the first drainage hole 104, and the drainage hole of the outer cavity 101 is the second drainage hole 103. This arrangement enables the inner and outer cavities 101 to communicate with each other through the first drainage hole 104, while the outer cavity 101 is connected to the outside of the pump housing 1 through the second drainage hole 103. As a result, water in the inner cavity 101 can be discharged to the outer cavity 101 through the first drainage hole 104, and water in the outer cavity 101 can be discharged to the outside of the pump housing 1 through the second drainage hole 103, thereby achieving the discharge of residual water in each cavity 101.

[0064] Furthermore, in this embodiment, the drainage holes on the cavity walls of each layer are arranged opposite to each other, for example, see Figure 6 The second drainage hole 103 on the outer cavity wall is horizontally opposite to the first drainage hole 104 on the inner cavity wall, so that the drainage plug 2 can pass through each drainage hole in sequence from the inside to the outside, thereby achieving synchronous sealing of multiple drainage holes through the same drainage plug 2, making its operation more convenient.

[0065] Accordingly, in this embodiment, the drain plug 2 includes the same number of water-passing sections as the number of the drain holes, for example, see Figure 6, corresponding to the structural design of the two drainage holes on the pump housing 1, the drainage plug 2 is provided with two water passages, namely the first water passage 206 and the second water passage 205, wherein the first water passage 206 is provided in the first drainage hole 104, and the second water passage 205 is provided in the second drainage hole 103, and, see Figure 7 There is a drainage gap 1021 between each water-passing section and the hole wall of the corresponding drainage hole to facilitate drainage of the two drainage holes.

[0066] In this embodiment, a sealing structure 201 is provided at the position corresponding to each drainage hole on the drain plug 2, for example, see Figure 5 Corresponding to the structural design of the two drainage holes on the pump casing 1, two sealing structures 201 are provided on the drainage plug 2. The two sealing structures 201 are used to block the two drainage holes respectively, so as to achieve synchronous sealing of the two drainage holes through the same drainage plug 2.

[0067] Specifically, in this embodiment, each blocking structure 201 is respectively provided at the end of each water flow section, for example, see Figure 5 A blocking structure 201 is provided at the tail end of the first water flow section 206, and a blocking structure 201 is also provided at the tail end of the second water flow section 205. With this arrangement, when the water flow section is passed through the drainage hole, the blocking structure 201 at its tail end can just block the corresponding one, so as to achieve blocking from the inside to the outside.

[0068] Furthermore, in this embodiment, the distance between two adjacent blocking structures 201 is equal to the distance between the inner ends of two adjacent drainage holes, for example, see Figure 5 and Figure 6 The distance between the two sealing structures 201 is exactly equal to the distance between the inner ends of the first drainage hole 104 and the second drainage hole 103. With this arrangement, when the inner sealing structure 201 is in close contact with the inner cavity wall, the outer sealing structure 201 is also in close contact with the outer cavity wall, thereby ensuring that the two sealing structures 201 synchronously seal the first drainage hole 104 and the second drainage hole 103, thereby ensuring the overall sealing of the pump casing 1.

[0069] For details, see Figure 6 In this embodiment, the blocking structure 201 is a blocking step. The two blocking structures 201 are a first blocking step 208 and a second blocking step 207. The diameter of each blocking step is larger than the diameter of the drainage hole located outside the blocking step and smaller than the diameter of the drainage hole located inside the blocking step. For example, see Figure 6The diameter of the first blocking step 208 is larger than the diameter of the first drainage hole 104, and the diameter of the second blocking step 207 is smaller than the diameter of the first drainage hole 104 and larger than the diameter of the second drainage hole 103. With this arrangement, when the drain plug 2 is inserted from the inside out, the second blocking step 207 can pass through the first drainage hole 104 and enter the outer cavity 101 to block the second drainage hole 103, while the first blocking step 208 can block the first drainage hole 104 within the inner cavity 101.

[0070] For more details, see Figure 6 In this embodiment, a plugging head is provided at the innermost end of the drain plug 2 (the tail end of the first water flow section 206). The diameter of the plugging head is larger than the diameter of the first water flow section 206 and also larger than the diameter of the first drainage hole 104. This forms a step at the junction of the plugging head and the first water flow section 206. This step is the first plugging step 208. In this embodiment, the diameter of each water flow section decreases from the inside to the outside, so that a plugging step is formed at the diameter change point of adjacent water flow sections. For example, see Figure 6 The diameter of the first water flow section 206 is larger than the diameter of the second water flow section 205 and also larger than the aperture of the second drainage hole 103 , so that a step is formed between the first water flow section 206 and the second water flow section 205 , which is the second blocking step 207 .

[0071] Correspondingly, in this embodiment, the diameters of the drainage holes on the cavity walls of each layer of the cavity 101 also decrease from the inside to the outside, and the diameter of each drainage hole is smaller than the diameter of the blocking step or water flow section located on the inside thereof and larger than the diameter of the water flow section located on the outside thereof. For example, see Figure 2 The aperture of the first drainage hole 104 is smaller than the diameter of the first blocking step 208 (blocking head) and larger than the diameter of the second blocking step 207. The aperture of the second drainage hole 103 is smaller than the diameter of the second blocking step 207 (first water flow section 206). This arrangement allows the apertures of each drainage hole to match the drainage plug 2 with a stepped structure, making it easier to achieve synchronous sealing of each through the same drainage plug 2.

[0072] Correspondingly, in this embodiment, a sealing ring 204 is provided on each blocking step to ensure the sealing performance.

[0073] It should be noted that, in this embodiment, the directions of “inside” and “end” can be understood as referring to the inside direction of the pump housing 1, i.e. Figure 5 The right direction of the orientation shown, the orientation indication of "outside" can be understood as the outside direction of the pump housing 1, that is, Figure 5 The left direction of the indicated orientation.

[0074] Example 3

[0075] This embodiment provides a pump, which includes the pump drainage structure of any of the above embodiments.

[0076] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0077] The above embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the concept of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be based on the appended claims.

Claims

1. A drainage structure for a pump, characterized in that: include: A pump housing (1), wherein one or more cavities (101) are provided in the pump housing (1), a drainage hole (102) is provided on the cavity wall of each layer of the cavity (101), and when the cavity (101) has two or more layers, the drainage holes (102) on the cavity walls of each layer are directly opposite; A drainage plug (2) is provided through each drainage hole (102) from the inside to the outside, and a blocking structure (201) is provided on the drainage plug (2) corresponding to each drainage hole (102), and the blocking structure (201) is used to block the drainage hole (102) opposite thereto from the inside to the outside; A locking assembly (3) is used to lock or unlock the drain plug (2) from the outside of the pump housing (1) so that the drain plug (2) opens or closes the drain hole (102).

2. The pump drainage structure according to claim 1, characterized in that: The blocking structure (201) comprises a blocking step (203) capable of covering the drainage hole (102) opposite thereto.

3. The pump drainage structure according to claim 2, characterized in that: A sealing ring (204) is provided on one side of the blocking step (203) facing the drainage hole (102) opposite thereto and surrounds the drainage hole (102) opposite thereto.

4. The pump drainage structure according to claim 2, characterized in that: The drainage plug (2) comprises water-passing sections (202) of the same number as the drainage holes (102), and each of the water-passing sections (202) is arranged in the drainage hole (102) corresponding thereto and has a drainage gap (1021) between the water-passing section and the hole wall of the drainage hole (102).

5. The pump drainage structure according to claim 3, characterized in that: When the cavity (101) has two or more layers, the diameters of the drainage holes (102) on the cavity walls of each layer of the cavity (101) decrease from the inside to the outside, and the diameter of each drainage hole (102) is smaller than the diameter of the blocking step (203) located on its inner side and larger than the diameter of the blocking step (203) located on its outer side; and the distance between two adjacent blocking steps (203) is equal to the distance between the inner ends of two adjacent drainage holes (102).

6. The pump drainage structure according to claim 4, characterized in that: The inner end of the drainage plug (2) is provided with a plugging head, and the connection between the plugging head and the water flow section (202) connected thereto is formed with the plugging step (203); The diameter of each water-passing section (202) decreases from the inside to the outside, and a blocking step (203) is formed at the diameter-changing portion between each two adjacent water-passing sections (202).

7. The pump drainage structure according to claim 5, characterized in that: The locking assembly (3) comprises a locking nut (301), and the locking nut (301) is screwed onto the portion of the drain plug (2) extending out of the pump housing (1).

8. The pump drainage structure according to claim 7, characterized in that: The locking assembly (3) further comprises a fixing card (303) detachably connected to the outside of the pump housing (1), and the fixing card (303) is used to limit the axial position of the locking nut (301).

9. The pump drainage structure according to claim 8, characterized in that: A chuck (302) is provided on the outer side of the pump housing (1) at the outer end of the drain hole (102); the fixing clamp (303) is detachably connected to the chuck (302); and the fixing clamp (303) is provided with a limiting clamping groove that can be buckled with the locking nut (301) and the chuck (302).

10. A pump, characterized in that: The pump drainage structure comprises the pump drainage structure according to any one of claims 1 to 9.

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