Submersible pump device and pump cover

Abstract

The invention relates to a pump cover (21), a shaft hole (210) allowing a pump impeller driving shaft (11) to penetrate through is formed in the pump cover, the material of the pump cover (21) is suitable for heat transfer, and the pump cover (21) is provided with a first pump cover face (21a) facing the outer portion of a pump during installation and a second pump cover face facing the inner portion of the pump during installation, the first pump cover face (21a) is provided with a flow channel (S) which continuously and spirally extends to the outer side of the periphery of the shaft hole (210) from the inner side of the periphery of the pump cover, and the flow channel (S) is in a groove shape with an opening in the top. Or the first pump cover face (21a) is internally provided with a closed pipeline-shaped flow channel (S), and the two ends of the closed pipeline-shaped flow channel (S) are communicated to the inner side of the periphery of the pump cover and the outer side of the periphery of the shaft hole (210) respectively. The invention also relates to a submersible pump arrangement (1) having such a pump cover (21).

Description

Technical Field

[0001] The present invention relates to a pump cover, which is suitable for a submersible pump device and used for closing an impeller installation port of the pump. The present invention also relates to a submersible pump device with the pump cover. Background Art

[0002] A submersible pump device is a special pump device suitable for use underwater. Generally, the submersible pump device comprises a combined drive part and a pump part, wherein the drive part comprises a drive unit such as a submersible motor, and the pump part is an end suction pump, for example, the motor shaft of the submersible motor extends into the pump body of the pump part, and the impeller is mounted at the end of the motor shaft.

[0003] In particular, when the submersible pump device is submerged deep underwater, the drive unit may require greater power, which may result in undesirable overheating, leading to failure or shortening the service life of the device. Therefore, it is advantageous to provide cooling measures for the drive unit of the submersible pump device. At present, submersible pump products with built-in active cooling circulation systems are already available on the market.

[0004] The pump part is generally equipped with a pump cover, which is used to close the pump body of the pump part. For example, in the case of an end-suction pump, the side of the pump body opposite to the inlet is usually designed with an impeller installation port with an opening size slightly larger than the impeller diameter. The impeller installation port is used to disassemble and overhaul the impeller, and the pump cover is used to close the impeller installation port. In particular, when used in a submersible pump device, the pump cover also serves to isolate the material in the pump from the cooling medium of the cooling circulation system.

[0005] In the prior art, there are flat pump covers as shown in FIG. 3 and Figure 3b The pump cover with reinforcing ribs shown has an axial hole that is raised relative to the surrounding area, and no heat exchange medium flow channel is specially constructed on the surface of the pump cover facing the outside of the drive unit. Therefore, the flow pattern of the heat exchange medium on the surface of the pump cover is poor and the heat dissipation effect is poor. Figure 3c The heat transfer medium is shown schematically in Figure 3b As shown in the flow conditions on the pump cover surface, since there is no restriction or guidance on the flow path of the heat exchange medium, on the one hand, the heat exchange medium may "take a shortcut" and leave the pump cover surface after briefly contacting the pump cover surface, resulting in the heat exchange medium failing to fully exchange heat with the pump cover. On the other hand, the heat exchange medium flows from the top of the pump cover surface to the water inlet position on the pump cover surface. Ideally, it should flow through the entire pump cover surface and then leave the pump cover surface at the water outlet position. However, the reinforcing ribs form multiple sectors on the pump cover surface, among which some sectors away from the water inlet position and the water outlet position are formed as "flow dead zones".

[0006] Therefore, it is hoped to improve the pump cover under the existing technology, improve the flow of heat exchange medium on the pump cover surface, enable the pump to fully dissipate heat through the pump cover surface, and use the heat exchange medium to more effectively cool the drive unit of the submersible pump device. Summary of the invention

[0007] To this end, according to a first aspect of the present invention, a pump cover is provided, wherein an axial hole is provided on the pump cover for allowing a pump impeller drive shaft to pass through, wherein the material of the pump cover is suitable for heat transfer, and the pump cover has a first pump cover surface facing the outside of the pump when installed and a second pump cover surface facing the inside of the pump when installed, wherein the first pump cover surface has a flow channel extending continuously and spirally from the inner side of the periphery of the pump cover to the outer side of the periphery of the axial hole, and the flow channel is in the shape of a groove with an opening at the top.

[0008] The spiral flow channel provides more effective heat exchange area for the heat exchange medium and the first pump cover surface of the pump cover, and allows the heat exchange medium to stay on the first pump cover surface of the pump cover for a longer time, so the efficiency of heat dissipation of the heat exchange medium through the pump cover will be significantly improved. In addition, it should be understood that the spiral flow channel guides the flow of the heat exchange medium, so that the heat exchange medium reaching the pump cover from the inner side of the periphery of the pump cover fully and evenly contacts the first pump cover surface of the pump cover before leaving the first pump cover surface of the pump cover from the outer side of the periphery of the shaft hole. In addition, the spiral shape also increases the structural strength of the pump cover.

[0009] The second pump cover faces the interior of the pump and is therefore preferably smooth to avoid disturbing the flow inside the pump and reducing the efficiency of the pump.

[0010] In the sense of the term of the present invention, "spiral" is a description of the shape of the flow channel, which can be generally understood as a shape that rotates around a certain point in circles, approaching or moving away. The specific shape and number of circles are not limited, and also include situations of only one circle or less than one circle.

[0011] It should be understood that the present invention also includes the case of having a multi-turn spiral flow channel. According to a preferred embodiment of the pump cover of the present invention, there are two or more flow channels on the first pump cover surface, and the starting points and / or end points of the flow channels are evenly or unevenly distributed on the circumference. For example, the starting points of several flow channels can be arranged at equally divided points of the circumference, or the starting points of these flow channels can be unevenly arranged on the circumference. The end points of the flow channels should also be arranged as understood above.

[0012] Alternatively or in addition, at least some of the flow channels may converge together on the outer side of the circumference of the shaft hole. This includes both forming a space on the outer side of the circumference of the shaft hole where all the flow channels converge, and also including the situation where the space near the outer side of the circumference of the shaft hole is divided into two or more parts by the flow channels extending thereto, each part being connected to the end point of one or more flow channels. Since the flow channels extend continuously in a spiral shape through the first pump cover surface of the entire pump cover, heat exchange has been fully and evenly achieved, and thus this division does not cause problems such as "flow taking shortcuts" or "flow dead zones" under the prior art. On the contrary, the heat exchange medium can still be properly provided to the heat exchange medium circuit for cooling the drive unit, which will be introduced later below.

[0013] As described above, the flow channel is in the shape of a groove with an open top. Preferably, the top of the groove of the flow channel is flush at all places. In this way, the top of the groove of these flow channels can be covered by an additional component provided in the driving part of the submersible pump device to be described below, such as the bottom of the partition element, so that after the heat exchange medium enters the flow channel at the water inlet position (such as the inner side of the periphery of the pump cover), it is guided to flow in the closed flow channel to the water outlet position (such as the outer side of the periphery of the shaft hole).

[0014] According to a preferred embodiment of the pump cover of the present invention, the flow channel is formed by a concave portion recessed in the first pump cover surface. In addition or alternatively, the flow channel can also be formed by a convex portion (B) protruding from the first pump cover surface; or, the flow channel can be formed by a concave portion recessed in the first pump cover surface and a convex portion protruding from the first pump cover surface. The latter can at least be understood as a part of the flow channel being formed by a concave portion recessed in the first pump cover surface and another part of the flow channel being formed by a convex portion protruding from the first pump cover surface, or it can be understood as each flow channel being formed by a concave portion recessed in the first pump cover surface and a convex portion protruding from the first pump cover surface. In any case, for each flow channel, the concave portion and the convex portion can be arbitrarily selected and superimposed. Although it is obvious that in some cases, this will result in the top of the groove not being flush everywhere, this can be achieved by designing the partition element mentioned above to be shaped to adapt to the top of the groove and still achieving the sealing of the top of the groove, so that the heat exchange medium can still flow from the water inlet position to the water outlet position in the closed flow channel.

[0015] According to a preferred embodiment of the pump cover of the present invention, the flow channel has a gradually increasing flow channel cross-sectional area in the process of extending from the inner side of the periphery of the pump cover to the outer side of the periphery of the shaft hole due to the gradually widening flow channel width and / or the gradually deepening flow channel depth. This is beneficial for the heat exchange medium to flow inward along the flow channel.

[0016] Of course, according to the changes of the water inlet position and the water outlet position on the pump cover in actual use, if the water inlet position is close to the outer side of the circumference of the shaft hole and the water outlet position is close to the inner side of the circumference of the pump cover, it is also possible to consider making the flow channel have a gradually increasing flow channel cross-sectional area due to the gradually widening flow channel width and / or gradually deepening flow channel depth in the process of extending from the outer side of the circumference of the shaft hole to the inner side of the circumference of the pump cover. In other words, at this time, there can be a flow channel cross-sectional area change trend opposite to that in the above preferred embodiment.

[0017] It should be understood that the change in flow channel width and the change in flow channel depth determine the change in flow channel cross-sectional area in combination. For example, a gradually increasing flow channel width and a gradually decreasing flow channel depth can be combined to obtain a gradually increasing, gradually decreasing or constant flow channel cross-sectional area. Any flow channel shape design or any flow channel cross-sectional area change trend falls within the scope of the present invention.

[0018] According to the second aspect of the present invention, the present invention further provides a pump cover, the pump cover is provided with an axial hole for allowing the pump impeller drive shaft to pass through, wherein the material of the pump cover is suitable for heat transfer, and the pump cover has a first pump cover surface facing the outside of the pump when installed and a second pump cover surface facing the inside of the pump when installed, and the pump cover has a closed pipe-like flow channel with two ends connected to the inner side of the periphery of the pump cover and the outer side of the periphery of the axial hole respectively. Different from the first aspect of the present invention, the flow channel is directly provided in the pump cover in the form of a closed pipe.

[0019] After the heat exchange medium enters the flow channel at the water inlet position (e.g., the inner side of the periphery of the pump cover), it is guided to flow in the closed pipe-shaped flow channel to the water outlet position (e.g., the outer side of the periphery of the shaft hole). The second pump cover surface faces the inside of the pump, so it is preferably smooth to avoid disturbing the flow inside the pump and reducing the efficiency of the pump. At this time, since the first pump cover surface will not disturb the flow of the heat exchange medium, it is allowed to design it to be smooth or have a structure with reinforcing ribs.

[0020] Similarly, for a closed pipe-shaped flow channel, there may be two or more such flow channels in the pump cover, and the starting point and / or end point of the flow channel may be evenly or unevenly distributed on the circumference. For example, the starting points of several flow channels may be arranged at equally divided points of the circumference, or the starting points of these flow channels may be unevenly arranged on the circumference. The end points of the flow channels should also be arranged as understood above.

[0021] Similar to the first aspect of the present invention, at least some of these closed pipe-shaped flow channels may merge together outside the periphery of the shaft hole. This includes both forming a space outside the periphery of the shaft hole where all the flow channels merge, and also including the situation where the space near the periphery of the shaft hole is divided into two or more parts by the flow channels extending thereto, each part being connected to the end point of one or more flow channels.

[0022] Preferably, the flow channel has a flow channel cross-sectional area that gradually increases, gradually decreases, or is constant from the inner side of the periphery of the pump cover to the outer side of the periphery of the shaft hole.

[0023] According to another aspect of the present invention, a submersible pump device is also provided, which includes a driving part and a pump part connected together, the impeller mounting port of the pump part is closed by the above-mentioned pump cover, the driving part has a driving unit for driving the pump impeller, a heat exchange medium circuit for cooling the driving unit and the pump impeller drive shaft connected to the driving unit, the pump impeller drive shaft passes through the axial hole of the pump cover and extends into the pump part, wherein the flow channel on the first pump cover surface of the pump cover is connected to the heat exchange medium circuit at the inner side of the periphery of the pump cover and the outer side of the periphery of the axial hole respectively.

[0024] For the implementation form in which the pump cover flow channel is in the shape of a groove with an opening at the top, the partition element mentioned above is arranged in the driving part, and the partition element has a wall portion and a bottom portion, the wall portion is suitable for guiding the fluid exchange medium in the heat exchange medium circuit to flow into the flow channel, and the bottom portion covers the top of the groove of the flow channel in and only in the middle section of the flow channel.

[0025] The flow of the heat exchange medium in the heat exchange medium circuit is at least partially driven by the driving unit. For example, a cooling circulation impeller is installed on the shaft section of the driving shaft in the driving part, and the heat exchange medium circuit passes through the cooling circulation impeller, and the cooling circulation impeller drives the heat exchange medium to flow in the heat exchange medium circuit. In this way, the rotation of the cooling circulation impeller provides a driving force for the circulation of the heat exchange medium.

[0026] According to a preferred embodiment of the submersible pump device of the present invention, the submersible pump device has an interlayer channel surrounding the drive unit from the periphery and communicating with the flow channel, and the heat exchange medium exchanges heat with the drive unit in the interlayer channel to cool the drive unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The implementation of the present invention is described in detail below in conjunction with the accompanying drawings. In the accompanying drawings:

[0028] Figure 1a An embodiment of a submersible pump device according to the invention is shown in a cross-sectional view;

[0029] Figure 1b exist Figure 1a Based on the above, it is further shown that the heat transfer medium Figure 1a Flow and heat transfer in the submersible pump unit shown;

[0030] Figure 2a An embodiment of a pump cover for use in a submersible pump device according to the present invention is shown;

[0031] Figure 2b The heat transfer medium is shown in Figure 2a Flow conditions on the pump cover surface shown;

[0032] Figure 3a A flat pump cover in the prior art is shown;

[0033] Figure 3b A pump cover with reinforcing ribs in the prior art is shown;

[0034] Figure 3c The heat transfer medium is shown in Figure 3b Flow conditions on the pump cover surface shown.

[0035] In the drawings, identical or functionally similar components are indicated by the same reference numbers for clarity. DETAILED DESCRIPTION

[0036] Figure 1a An exemplary embodiment of a submersible pump device according to the invention is shown in a sectional view. Figure 1b exist Figure 1a Based on the above, it is further shown that the heat transfer medium Figure 1a Flow and heat transfer in a submersible pump installation shown.

[0037] like Figure 1a The submersible pump device shown comprises a driving part 1 and a pump part 2 coupled together. The driving part 1 comprises a driving unit 101 for driving a pump impeller of the submersible pump device. The pump part 2 comprises a pump body 20 and a pump cover 21 for closing an impeller mounting opening 22 on the pump body 20. Figure 2a 1 shows an embodiment of a pump cover used in a submersible pump device according to the present invention. The drive shaft 11 of the drive unit 101 extends into the pump part 2 through the shaft hole 210 of the pump cover 21. The drive unit 101 is, for example, a known submersible motor, and the drive shaft 11, i.e., the motor shaft, extends from the inside thereof. The pump part 2 is, for example, a known end suction pump, and the pump body 20 has a pump inlet 201 and a pump outlet 202, and the impeller mounting port 22 is arranged on the other side opposite to the pump inlet 201. Sealing measures can be taken between the drive shaft 11 and the pump cover 21, and the sealing measures do not affect the rotation of the drive shaft 11.

[0038] The drive shaft 11 is provided with a cooling circulation impeller 31 on the shaft section located in the drive part 1, and a pump impeller 32 is provided on the shaft section located in the pump part 2, and both of them rotate synchronously with the drive shaft 11. The pump impeller 32 is a common pump working impeller, and the cooling circulation impeller 31 is related to the heat exchange medium circuit explained in detail below. As an example, the suction surface of the cooling circulation impeller 31 faces the pump cover 21.

[0039] According to the present invention, a heat exchange medium circuit for cooling the drive unit 101 is formed inside the drive part 1, and the heat exchange medium circulates along the heat exchange medium circuit.

[0040] Figure 1a The embodiment shown describes a specific arrangement of the heat exchange medium circuit. Here, the drive unit 101 is a submersible motor with a cooling jacket 102. An interlayer channel 103 is formed between the drive unit 101 (e.g., a motor) and the cooling jacket 102 sleeved outside the drive unit 101. Figure 1b As shown. The heat exchange medium circulates in the interlayer channel 103, and the heat generated by the drive unit 101 is transferred to the heat exchange medium in the interlayer channel 103, thereby cooling the drive unit 101. The heat exchange medium is a fluid with good heat transfer performance (such as water). The design of the interlayer channel 103 is preferably such that the heat exchange medium and the drive body 101 have as much heat exchange area as possible without losing good fluidity. The interlayer channel 103 can be distributed with a plurality of inlets 103a and a plurality of outlets 103b in the circumferential direction.

[0041] The material of the pump cover 21 is suitable for heat transfer, such as metal. Therefore, the heat in the driving part 1 is transferred to the pump part 2 via the pump cover 21, and in particular, the heat is transferred to the pumping medium being pumped in the pump part 2, and then the pumping medium takes the heat out of the submersible pump device. The driving part 1 and the pump part 2 can achieve isolation of their respective internal substances through the seals of the pump cover 21 and the pump body 20 and the seals of the drive shaft 11 and the pump cover 21, so that the heat exchange medium in the driving part 1 will not be mixed with the pumping medium in the pump part 2. Figure 1b The transfer direction of heat Q is shown by broken line arrows between the drive unit 101 and the interlayer channel 103 and between the upper and lower sides of the pump cover.

[0042] Furthermore, the pump cover 21 has a first pump cover surface 21a facing the outside of the pump when installed and a second pump cover surface 21b facing the inside of the pump when installed. Figure 2a As shown, the first pump cover surface 21a has a flow channel S extending continuously and spirally from the inner side of the periphery of the pump cover to the outer side of the periphery of the shaft hole 210, and the flow channel S is in the shape of a groove with an open top. Figure 2a Two flow channels S are shown that are basically symmetrically distributed on the circumference, but it should be understood that there can be one, two or more flow channels S on the first pump cover surface 21a, and the starting point and / or end point of the flow channel S can be evenly distributed on the circumference or unevenly distributed.

[0043] The flow channel S is formed by a concave portion A recessed into the first pump cover surface 21a and a convex portion B protruding from the first pump cover surface 21a. Figure 2a However, such a groove shape can also be formed by a concave portion A recessed into the first pump cover surface 21a or a convex portion B protruding from the first pump cover surface 21a.

[0044] In order to guide the heat exchange medium to flow in the pump cover and only enter / leave the flow channel in the pump cover at the water inlet position Sa (here, near the inner side of the periphery of the pump cover) and the water outlet position Sb (here, near the outer side of the periphery of the shaft hole 210), a partition element is provided in the driving part 1 of the submersible pump device. The wall 131 of the partition element is suitable for guiding the liquid exchange medium in the heat exchange medium circuit to flow into the flow channel S, and the bottom 132 of the partition element covers the top of the groove of the flow channel S only in the middle section of the flow channel S. In this way, at the water inlet position Sa and the water outlet position Sb, the flow channel S of the pump cover 21 is directly or indirectly connected with the inlet 103a and outlet 103 of the interlayer channel 103 in the driving part 1 just described above, so that the heat exchange medium circuit is completely closed.

[0045] Figure 2b 2 shows a pump cover with two spiral flow channels, which are marked as S1 and S2, respectively. Their respective water inlet positions Sa are located near the inner side of the periphery of the pump cover, and the water outlet positions Sb merge near the outer side of the periphery of the shaft hole 210. The two spirals are basically centrally symmetrical, but this is not necessary for the present invention. The arrows in the figure also show the flow direction of the heat exchange medium in the double spiral flow channel.

[0046] The flow of the heat exchange medium in the heat exchange medium circuit including the interlayer channel 103 and the flow channel S in the pump cover can be driven by a separately connected circulation pump, but more simply, it is driven by the drive unit 101. Figure 1a As shown, the drive shaft is provided with a cooling circulation impeller on the shaft section in the drive part 1, and the heat exchange medium loop passes through the cooling circulation impeller, so the rotation of the cooling circulation impeller 31 driven by the drive shaft plays the effect of circulating the heat exchange medium in the heat exchange medium loop. Here, still taking the example that the suction surface of the cooling circulation impeller 31 faces the pump cover 21, as shown in FIG. Figure 1bAs shown, the bottom 132 and the wall 131 of the partition element form a return water chamber 14c on the radial outer side of the partition element 13, the radial inner side of the partition element 13 and the back side (water suction surface) of the cooling circulation impeller 31 together form a water suction chamber 14a, and the radial inner side of the partition element 13 and the front side of the cooling circulation impeller 31 form a high-pressure chamber 14b. The heat exchange medium circulating in the interlayer channel 103 exchanges heat with the drive unit 101 and enters the return water chamber 14c through the outlet 103b of the interlayer channel. The return water chamber 14c is connected to the spiral flow channel S in the pump cover 21 on the inner side of the periphery of the pump cover 21. The heat exchange medium is driven through the flow channel S in the pump cover 21 to the outer side of the periphery of the shaft hole 210 under the action of the driving force (here, the rotational suction force of the cooling circulation impeller), and then enters the connected water suction chamber 14a there. The cooling circulation impeller 31 pressurizes the heat exchange medium in the water absorption chamber 14a and transports it to the high-pressure chamber 14b located in front of it, and then returns to the interlayer channel 103 through the inlet 103a connected to the high-pressure chamber 14b for the next circulation with the drive unit 101.

[0047] It should be understood that the cooling circulation impeller 31 can also be arranged in the reverse direction, that is, the water suction surface is arranged on the side facing away from the pump cover 21. Obviously, the return water chamber can also be connected to the outer side of the periphery of the shaft hole 210, and the water suction chamber is connected to the inner side of the periphery of the pump cover 21. The above embodiment only explains in principle how the cooling circulation impeller 31 plays a driving role in the heat exchange medium circuit.

[0048] like Figure 2a and Figure 2b The pump cover shown is generally disc-shaped, but other shapes are possible.

[0049] In an alternative embodiment, it is also possible to design the flow channel in the pump cover into a closed pipe shape. In other words, the flow channel is connected to the outside world only at the water inlet position Sa and the water outlet position Sb. Figure 2b It can also be understood as a cross-sectional view of the pump cover of this design. In this case, the partition element only needs to separate the return water chamber connected to the water inlet position Sa from the water suction chamber and the high-pressure chamber connected to the water outlet position, and does not need to serve as a sealing element for the groove on the pump cover.

[0050] Figure 2a and Figure 2bThe flow channels shown in the figure are separated at the water inlet position Sa and merge into a common chamber at the water outlet position Sb (the so-called "merge" means that different flow channels are connected here), but this is not necessary. In the case where there are multiple flow channels on or in the pump cover, it is also possible to consider merging their water outlet positions Sb in several separate chambers and merging their water inlet positions Sa in a connected annular chamber. For the flow channels in the sense of the present invention, it is important that they uniformly cover the pump cover area as a whole and can be connected with the water inlet and outlet of the sandwich channel, and there can be any choice in the specific structural design.

[0051] In this regard, it can be understood that "spiral" refers to a shape that rotates around a certain point in circles, approaching or moving away. The specific form of the spiral is not limited (regular or irregular spiral), the number of spirals is not limited, and the number of turns of the spiral is not limited.

[0052] In addition, the position of the shaft hole 210 on the first pump cover surface 21a is preferably configured as a raised portion relative to the surrounding raised portion, and the raised portion includes a circumferential raised wall 2101, and the raised wall 2101 is preferably configured to be inclined inward from bottom to top, so that Figure 1b As shown, the heat exchange medium is advantageously guided toward the cooling circulation impeller 31. Figure 2b As shown, in some embodiments, the heat exchange medium flow channel S is configured so that the flow direction of the heat exchange medium does not point to the raised wall 2101 to reduce kinetic energy loss.

[0053] In addition, the pump impeller 32 performs work on the pumped medium in the pump body 20, and the pumped medium flows at high speed. Accordingly, the second pump cover surface 21b of the pump cover 21 facing the pump part 2 is preferably constructed as a plane that is as smooth as possible, especially without additional ribs, so as to increase the surface convection heat transfer coefficient, so that heat can be more efficiently transferred from the pump cover 21 to the pumped medium.

[0054] The shaft section of the drive shaft 11 where the cooling circulation impeller 31 is installed is located in the drive part. The space where it is located can be formed by the upward extension of the pump impeller installation opening of the pump part or the downward extension of the drive part. However, usually, the drive unit 101 and the pump cover 21 are connected through the intermediate transition part. Figure 1a and Figure 1b In the illustrated embodiment, the submersible pump device 1 is arranged vertically, and the transition portion is a drive unit support 12 arranged on the pump portion 20 for supporting the drive unit 101. The water suction chamber 14a, high pressure chamber 14b, and return water chamber 14c mentioned above can be formed under the division of the drive unit support 12, the pump cover 21, and the partition element 13.

[0055] Although some embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various combinations, changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

[0056] Reference numerals list

[0057] 1. Drive part

[0058] 101 Drivers

[0059] 102 Cooling Jacket

[0060] 103 Mezzanine Passage

[0061] 103a mezzanine channel entrance

[0062] 103b mezzanine passage exit

[0063] 11 Drive shaft

[0064] 12 Drive unit support

[0065] 121 Inner wall of drive unit support

[0066] 13 Partition elements

[0067] 131 Wall of partition element

[0068] 132 Bottom of the partition element

[0069] 14a Water absorption chamber

[0070] 14b High pressure chamber

[0071] 14c Water return chamber

[0072] 2 Pump section

[0073] 20 Pump body

[0074] 201 Pump inlet

[0075] 202 Pump outlet

[0076] 21 Pump cover

[0077] 22 Impeller mounting port

[0078] 210 Shaft hole

[0079] 220 Inside the periphery of the pump cover

[0080] 230 Outside the periphery of the shaft hole

[0081] 2101 uplift wall

[0082] 21a First pump cover

[0083] 21b Second pump cover

[0084] A recess

[0085] B convex part

[0086] C. Shortcut flow

[0087] D Flow dead zone

[0088] S runner

[0089] Sa Water inlet position

[0090] Sb water outlet position

[0091] S1 First spiral channel

[0092] S2 Second spiral channel

[0093] 31 Cooling circulation impeller

[0094] 32 Pump impeller

[0095] Q Heat

Claims

1. A pump cover (21), wherein the pump cover is provided with an axial hole (210) for allowing a pump impeller drive shaft (11) to pass through, characterized in that: The material of the pump cover (21) is suitable for heat transfer, and The pump cover (21) comprises a first pump cover surface (21a) facing the outside of the pump when installed, and a second pump cover surface facing the inside of the pump when installed, the first pump cover surface (21a) comprising a flow channel (S) extending continuously and spirally from the inner side of the periphery of the pump cover to the outer side of the periphery of the axial hole (210), the flow channel (S) being in the shape of a groove with an opening at the top.

2. The pump cover (21) according to claim 1, characterized in that: The second pump cover surface is smooth.

3. The pump cover (21) according to claim 1 or 2, characterized in that: There are two or more flow channels (S) on the first pump cover surface (21a), and the starting points and / or end points of the flow channels (S) are evenly or unevenly distributed on the circumference.

4. The pump cover (21) according to claim 3, characterized in that: At least some of the flow channels (S) merge together outside the periphery of the axial hole (210).

5. The pump cover (21) according to claim 4, characterized in that: The groove tops of the flow channel (S) are flush everywhere.

6. The pump cover (21) according to claim 1 or 2, characterized in that: The flow channel (S) is formed by a recess (A) recessed into the first pump cover surface (21a); ​​or The flow channel (S) is formed by a convex portion (B) protruding from the first pump cover surface (21a); ​​or The flow channel (S) is formed by a concave portion (A) recessed into the first pump cover surface (21a) and a convex portion (B) protruding from the first pump cover surface (21a).

7. The pump cover (21) according to claim 6, characterized in that: The flow channel (S) has a gradually increasing, gradually decreasing or constant flow channel cross-sectional area due to a gradually changing flow channel width and / or a gradually changing flow channel depth in the process of extending from the inner side of the periphery of the pump cover to the outer side of the periphery of the axial hole (210).

8. A pump cover (21), wherein the pump cover is provided with an axial hole (210) for allowing a pump impeller drive shaft (11) to pass through, characterized in that: The material of the pump cover (21) is suitable for heat transfer, and The pump cover (21) has a first pump cover surface (21a) facing the outside of the pump when installed and a second pump cover surface (21b) facing the inside of the pump when installed. The pump cover (21) has a closed pipe-shaped flow channel (S) with two ends respectively connected to the inner side of the periphery of the pump cover and the outer side of the periphery of the axial hole (210).

9. The pump cover (21) according to claim 8, characterized in that: The first pump cover surface (21a) is smooth or has reinforcing ribs, and the second pump cover surface (21b) is smooth.

10. The pump cover (21) according to claim 8 or 9, characterized in that: Two or more flow channels (S) are arranged in the pump cover (21), and the starting points and / or end points of the flow channels (S) are evenly or unevenly distributed on the circumference.

11. The pump cover (21) according to claim 10, characterized in that: At least some of the flow channels (S) merge together outside the periphery of the axial hole (210).

12. The pump cover (21) according to claim 8 or 9, characterized in that: The flow channel (S) has a flow channel cross-sectional area that gradually increases, gradually decreases, or is constant from the inner side of the periphery of the pump cover to the outer side of the periphery of the shaft hole (210).

13. A submersible pump device (1), comprising a drive part (1) and a pump part (2) coupled together, characterized in that: The impeller mounting opening of the pump part (2) is closed by a pump cover (21) according to any one of claims 1 to 7, the drive part (1) comprises a drive unit (101) for driving a pump impeller, a heat exchange medium circuit for cooling the drive unit (101), and the pump impeller drive shaft (11) connected to the drive unit (101), the pump impeller drive shaft (11) passes through the shaft hole (210) of the pump cover (21) and extends into the pump part (2), The flow channel (S) on the first pump cover surface (21a) of the pump cover (21) is connected to the heat exchange medium circuit at the inner side of the periphery of the pump cover (21) and the outer side of the periphery of the axial hole (210).

14. The submersible pump device (1) according to claim 13, characterized in that The drive part (1) is provided with a partition element, the partition element having a wall portion (131) and a bottom portion (132), the wall portion (131) being suitable for guiding the liquid exchange medium in the heat exchange medium circuit to flow into the flow channel (S), and the bottom portion (132) covering the top of the groove of the flow channel (S) at and only at the middle section of the flow channel (S).

15. The submersible pump device (1) according to claim 13 or 14, characterized in that The flow of the heat exchange medium in the heat exchange medium circuit is at least partially driven by the drive unit (101).

16. The submersible pump device (1) according to claim 15, characterized in that The drive shaft is provided with a cooling circulation impeller on the shaft section inside the drive part (1), and the heat exchange medium circuit passes through the cooling circulation impeller.

17. The submersible pump device (1) according to any one of claims 1 to 5, characterized in that The submersible pump device (1) has an interlayer channel (103) which surrounds the driving unit (101) from the periphery and is connected to the flow channel (S).

18. A submersible pump device (1), comprising a drive part (1) and a pump part (2) coupled together, characterized in that: The impeller mounting opening of the pump part (2) is closed by a pump cover (21) according to any one of claims 8 to 12, the drive part (1) comprises a drive unit (101) for driving a pump impeller, a heat exchange medium circuit for cooling the drive unit (101), and the pump impeller drive shaft (11) connected to the drive unit (101), the pump impeller drive shaft (11) passes through the shaft hole (210) of the pump cover (21) and extends into the pump part (2), The flow channel (S) in the pump cover (21) is connected to the heat exchange medium circuit at the inner side of the periphery of the pump cover (21) and the outer side of the periphery of the shaft hole (210) respectively.

19. The submersible pump device (1) according to claim 18, characterized in that The flow of the heat exchange medium in the heat exchange medium circuit is at least partially driven by the drive unit (101).

20. The submersible pump device (1) according to claim 19, characterized in that The drive shaft is provided with a cooling circulation impeller on the shaft section in the drive part (1), the heat exchange medium circuit passes through the cooling circulation impeller, and the cooling circulation impeller drives the heat exchange medium to flow in the heat exchange medium circuit.

21. The submersible pump device (1) according to claim 20, characterized in that The submersible pump device (1) has an interlayer channel (103) which surrounds the driving unit (101) from the periphery and is connected to the flow channel (S).

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