Pump body with flow channel surface covered with stainless steel sleeve and pump applying pump body

Abstract

The utility model relates to a pump body with a stainless steel sleeve covered on the surface of a flow channel and a pump applying the pump body, and solves the problems that the surface of a fluid flow channel in a cast pump body in the prior art is rough, the fluid flow channel generates resistance to fluid, the efficiency of a water pump is damaged, the pump body is easy to corrode and the like. The fluid flow channel is arranged in the pump body, the impeller is arranged in the pump body and matched with the fluid flow channel, and the pump is characterized in that the inner wall of the fluid flow channel is covered with a stainless steel sleeve, and the stainless steel sleeve is used for sealing the surface of the fluid flow channel. The stainless steel pump has the advantages that the stainless steel sleeve is arranged in the fluid channel of the pump body, the pump body is isolated from direct contact with fluid through the stainless steel sleeve, the surface of the stainless steel sleeve is smooth, smoothness of the surface of the fluid channel is improved, fluid efficacy loss is reduced, and therefore pump efficiency is guaranteed; therefore, the service life of the pump body is prolonged.

Description

Technical Field

[0001] The utility model relates to the fields of water pump components and water pumps, in particular to a pump body with a flow channel surface covered with a stainless steel sleeve and a pump using the same. Background Art

[0002] With the widespread use of electronic water pumps, more and more high-power electronic water pumps are constantly appearing (such as high-power pumps in the HVAC industry. The water pumps used in the HVAC industry are mainly used to maintain the circulation and transportation of cold and hot water, and maintain the temperature of the indoor air through the circulation of water). At present, the pump bodies of most high-power pumps are cast using casting technology. The flow channels inside the pump body are relatively rough as a whole. After long-term use, the pump body will experience electrochemical corrosion mainly caused by oxygen depolarization, which will further increase the roughness of the flow channel surface. The rough inner flow channel surface increases the resistance to the fluid, resulting in reduced water pump efficiency and increased energy consumption. In addition, the process of installing the mouth ring that cooperates with the impeller inside the pump body is relatively complicated, and the leakage at the mouth ring is also relatively serious, which also reduces the efficiency of the water pump. Utility Model Content

[0003] The purpose of the present utility model is to solve the above-mentioned problems existing in the prior art and to provide a pump body with a flow channel surface covered with a stainless steel sleeve and a pump using the same. By arranging the stainless steel sleeve in the fluid channel of the pump body, the stainless steel sleeve has a relatively smooth surface and is corrosion-resistant. Since the stainless steel sleeve isolates the pump body from direct contact with the fluid, it is beneficial to avoid the corrosion of the pump body due to long-term use, and it is also beneficial to avoid the situation where the fluid flow channel surface in the cast pump body is relatively rough and generates resistance to the fluid and damages the fluid flow efficiency, thereby improving the service life of the pump body and the operating efficiency of the pump during operation.

[0004] The above technical objectives of the present invention are mainly solved by the following technical solutions: a pump body with a flow channel surface covered with a stainless steel sleeve, comprising a pump body, a fluid flow channel arranged in the pump body, and an impeller arranged in the pump body and cooperating with the fluid flow channel, characterized in that the inner wall of the fluid flow channel is covered with a stainless steel sleeve, and the stainless steel sleeve is used to isolate the fluid from direct contact with the pump body. By arranging a stainless steel sleeve in the fluid channel of the pump body, the pump body is isolated from direct contact with the fluid by the stainless steel sleeve, and the surface of the stainless steel sleeve is relatively smooth, avoiding the situation where the rough surface of the fluid flow channel in the cast pump body generates resistance to the fluid and damages the fluid flow efficiency, which is conducive to improving the smoothness of the fluid flow channel surface, reducing the loss of fluid effectiveness, and thus ensuring the pump efficiency. At the same time, the stainless steel sleeve is also corrosion-resistant, which is conducive to increasing the service life of the pump body.

[0005] As a further improvement and supplement to the above-mentioned technical solution, the present invention adopts the following technical measures: the water inlet ring of the impeller is equipped with a sealing ring, and the sealing ring is sealed and fixed with the stainless steel sleeve. That is, a sealing ring is provided at a corresponding position of the water inlet ring of the impeller. The sealing ring can be directly fixed to the stainless steel sleeve, or a groove of corresponding size (i.e., an annular notch) can be cut in the stainless steel sleeve, the bottom of the sealing ring is installed in the cut groove (i.e., annular notch), and the contact area between the sealing ring and the stainless steel sleeve is welded to achieve a sealing fixation. The provision of the sealing ring helps reduce leakage at the impeller mouth ring, thereby improving pump efficiency. At the same time, the sealing ring helps protect the impeller mouth ring, preventing the impeller from colliding with the pump body or the stainless steel sleeve during installation and being damaged.

[0006] Preferably, the fluid flow channel includes an inlet channel, an impeller chamber, and an outlet channel that are connected in sequence. The stainless steel sleeve has an annular notch, which is located at corresponding positions of the water inlet end of the impeller chamber and the inner end of the water inlet channel. The sealing ring is embedded in the annular notch, and the sealing ring is sealed and welded to the water inlet end of the impeller chamber flow channel and the inner end of the water inlet channel, respectively. The annular notch is provided so that the bottom of the sealing ring is embedded in the annular notch, and the contact portion of the sealing ring with the stainless steel is welded to form a sealed fixation by welding. Since the bottom of the sealing ring is embedded in the annular notch, it is beneficial to make the assembly space between the stainless steel sleeve, the sealing ring, and the water inlet port ring of the impeller more compact, which is not only beneficial to controlling the overall volume of the pump body, but also beneficial to controlling the sealing between the sealing ring and the water inlet port ring of the impeller, and the sealing between the sealing ring and the stainless steel sleeve, thereby ensuring the efficiency of the pump.

[0007] Preferably, the sealing ring has a sealing cavity with a U-shaped cross section, the water inlet port ring of the impeller is inserted into the sealing cavity, and the water inlet port ring and the inner wall of the sealing ring are gap-matched, the gap having a U-shaped cross section, and the gap being a floating sealing gap of the water inlet port ring. The U-shaped cross section of the gap allows the end wall, inner wall, and outer wall of the impeller water inlet port ring to form a sealing channel with the inner wall of the U-shaped sealing cavity of the sealing ring. During use, two axial sealing channels are formed between the inner and outer walls of the impeller water inlet port ring and the sealing ring, and a transverse sealing channel is formed between the end wall of the impeller water inlet port ring and the sealing ring. After the fluid gap, it first passes through the axial sealing channel at the inner wall of the impeller water inlet port ring, then passes through the transverse sealing channel at the bottom of the sealing ring, and finally passes through the axial sealing channel at the outer wall of the impeller water inlet port ring, significantly reducing the flow velocity of the fluid, thereby achieving a sealing effect by cutting off the fluid.

[0008] Preferably, the sealing ring is a one-piece structure, comprising an annular base plate, and inner and outer ring plates respectively positioned on the inner and outer edges of the base plate. The inner ring plate has a height H2 greater than the outer ring plate's height H1. Because the fluid first enters the axial sealing passage on the inner wall of the impeller's water inlet ring, the inner ring plate's height H2 is greater than the outer ring plate's height H1. This results in a longer axial sealing passage on the inner wall of the water inlet ring, thereby achieving an effective sealing effect.

[0009] Preferably, the gap between the water inlet port ring and the bottom plate is L1, the gap between the water inlet port ring and the inner ring plate is L2, and the gap between the water inlet port ring and the outer ring plate is L3, with both L2 and L3 being smaller than L2. That is, the transverse sealing channel at the bottom of the sealing ring has a larger cross-section, allowing more fluid to flow within the transverse sealing channel, which helps dilute the fluid flow rate, thereby facilitating a cutoff effect on the fluid in the gap and improving the sealing effect.

[0010] Preferably, the pump body is provided with a connecting ring, and the stainless steel sleeve extends outward from the water inlet, water outlet and connecting ring of the pump body respectively and turns outward to cover the surface of the outer wall of the water inlet end, the outer wall of the water outlet end and the outer end wall of the connecting ring of the pump body. In actual application, the water inlet end and the water outlet end of the fluid flow channel are respectively connected to the water inlet and the water outlet on the pump body, and the water inlet end and the water outlet end of the pump body and the outer end of the connecting ring need to be connected to the corresponding components. In order to prevent the water inlet end, the water outlet end and the outer end of the connecting ring of the pump body from corrosion, the stainless steel sleeve is extended outward and turned outward to cover the corresponding end, so that each connecting end of the pump body is also corrosion-resistant, which is further conducive to improving the service life of the pump body.

[0011] Preferably, flanges are provided on the pump body at locations corresponding to the water inlet and water outlet, and the outer end face of each flange has an axially outwardly protruding sealing boss. The stainless steel sleeve is turned outward and covers the sealing boss at locations corresponding to the water inlet and water outlet, and the flange and the sealing boss are an integral structure with the pump body. The provision of the flange facilitates the connection between the water inlet and outlet ends of the pump body and the corresponding components. The provision of the sealing boss facilitates convenient connection and facilitates the formation of a nested matching relationship through the yin-yang concave-convex manner, thereby facilitating the sealing of the connection. The stainless steel sleeve covers at least the sealing boss, which facilitates the sealing of the locations that may come into contact with the fluid through the stainless steel sleeve. In order to further increase the corrosion resistance of the pump body, the stainless steel sleeve can also extend radially outward to cover a larger area of ​​the end face. The stainless steel sleeve further covers the locations that may come into contact with the fluid, making the pump body more corrosion-resistant.

[0012] Preferably, the connection between the sealing boss and the fluid flow channel is a chamfered structure, and the connection between the outward-facing portion of the stainless steel sleeve and the fluid flow channel is a chamfered structure. By providing a chamfered structure (which can be a chamfer or a rounded corner), the incoming fluid can flow more smoothly through the fluid flow channel (inflow or outflow), avoiding right angles that hinder the fluid, reducing hydraulic losses, and thus helping to ensure water pump efficiency.

[0013] The second technical solution of the present invention is a pump having a flow channel surface covered with a stainless steel sleeve, comprising a pump body with an internal impeller, a coupling member connected to a connecting ring on the pump body, and a motor connected to the coupling member, wherein a rotating shaft of the motor extends into the pump body to connect to the impeller. The pump body is characterized in that the flow channel surface is covered with the stainless steel sleeve. This technical solution has all the beneficial technical effects of the technical solution of the first technical solution.

[0014] The present invention has the following beneficial effects: 1. By providing a stainless steel sleeve within the fluid passage of the pump body, the stainless steel sleeve isolates the pump body from direct contact with the fluid. The stainless steel sleeve has a relatively smooth surface, which improves the smoothness of the fluid passage surface and reduces fluid loss, thereby ensuring pump efficiency. Furthermore, the stainless steel sleeve is corrosion-resistant, thereby increasing the service life of the pump body. 2. The provision of a sealing ring reduces leakage from the impeller mouth ring, thereby improving pump efficiency. The sealing ring also protects the impeller mouth ring, preventing damage from collision with the pump body or the stainless steel sleeve during installation. 3. Because the bottom of the sealing ring is embedded in the annular notch, the assembly space between the stainless steel sleeve, the sealing ring, and the impeller water inlet ring is more compact, not only helping to control the overall volume of the pump body, but also improving the sealing between the sealing ring and the impeller water inlet ring, and between the sealing ring and the stainless steel sleeve, thereby ensuring pump efficiency. 4. The specific structure of the sealing ring and the U-shaped sealing channel formed by its interaction with the impeller water inlet ring facilitate effective sealing, reducing fluid leakage from the impeller water inlet ring, and thus ensuring pump efficiency. 5. The water inlet and outlet ends of the pump body and the outer end of the connecting ring must be connected to the corresponding parts. In order to prevent corrosion of the water inlet, outlet and outer ends of the connecting ring of the pump body, the stainless steel sleeve is extended outward and turned outward to cover the corresponding ends, so that the connecting ends of the pump body are also corrosion-resistant, which is further beneficial to improve the service life of the pump body. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model is a schematic cross-sectional structural diagram of the pump body, impeller and sealing ring involved in the cooperation.

[0016] Figure 2This is a structural diagram of the sealing ring involved in the utility model.

[0017] Figure 3 yes Figure 1 Schematic diagram of the enlarged structure of part A in the middle.

[0018] In the figure: 1. Pump body; 2. Impeller; 3. Sealing ring; 4. Water inlet channel; 5. Impeller chamber; 6. Water outlet channel; 7. Sealing chamber; 8. Bottom plate; 9. Inner ring plate; 10. Outer ring plate; 11. Connecting ring; 12. Outer wall of water inlet end; 13. Outer wall of water outlet end; 14. Water inlet port ring; 15. Flange; 16. Chamfered corner structure; 17. Stainless steel sleeve. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be further specifically described below with reference to the embodiments and the accompanying drawings.

[0020] Example 1: Figure 1-Figure 3 As shown, a pump body with a flow channel surface covered with a stainless steel sleeve includes a pump body 1, a fluid flow channel arranged in the pump body 1, and an impeller 2 arranged in the pump body 1 and matched with the fluid flow channel.

[0021] The difference between this technical solution and the prior art is that the inner wall of the fluid flow channel is covered with a stainless steel sleeve 17, and the stainless steel sleeve 17 is used to isolate the fluid from direct contact with the pump body.

[0022] This technical solution sets a stainless steel sleeve 17 in the fluid channel of the pump body 1, and isolates the pump body 1 from direct contact with the fluid through the stainless steel sleeve 17. The surface of the stainless steel sleeve 17 is relatively smooth, which avoids the situation where the rough surface of the fluid flow channel in the cast pump body 1 creates resistance to the fluid and damages the fluid flow efficiency. It is beneficial to improve the smoothness of the fluid flow channel surface and reduce the loss of fluid effectiveness, thereby ensuring the pump efficiency. At the same time, the stainless steel sleeve 17 is also corrosion-resistant, which is beneficial to improving the service life of the pump body 1.

[0023] In practical applications, the stainless steel sleeve 17 and the pump body 1 , as well as the stainless steel sleeve 17 and the sealing ring 3 are connected by welding, preferably laser welding.

[0024] In actual application, in order to facilitate the assembly and welding of the stainless steel sleeve 17, the stainless steel sleeve 17 is spliced ​​from multiple parts. To facilitate disassembly and splicing, the stainless steel sleeve 17 is divided at the sealing ring 3. After welding with the sealing ring 3, the surface of the stainless steel sleeve 17 and the outer surface of the sealing ring 3 form an integral structure, which is conducive to ensuring the sealing effect and preventing corrosion of the pump body 1 at the connection between the stainless steel sleeve 17 and the sealing ring 3.

[0025] Further improvement and supplement to the above technical solutions:

[0026] In actual application, the water inlet port ring 14 of the impeller 2 is equipped with a sealing ring 3, and the sealing ring 3 is sealed and fixedly engaged with the stainless steel sleeve 17. That is, the sealing ring 3 is provided at the corresponding position of the water inlet port ring 14 of the impeller 2. The sealing ring 3 can be directly fixed on the stainless steel sleeve 17, or a groove (i.e., an annular notch) of corresponding size can be cut on the stainless steel sleeve 17, and the bottom of the sealing ring 3 is installed in the cut groove (i.e., annular notch), and then the contact portion of the sealing ring 3 and the stainless steel sleeve 17 are welded to achieve sealing and fixation.

[0027] The provision of the sealing ring 3 is beneficial to reducing leakage at the mouth ring of the impeller 2, thereby improving pump efficiency. At the same time, the sealing ring 3 is beneficial to protecting the mouth ring of the impeller 2, preventing the impeller 2 from colliding with the pump body 1 or the stainless steel sleeve 17 during installation and being damaged.

[0028] In actual application, the fluid flow channel includes an inlet flow channel 4, an impeller chamber 5 and an outlet flow channel 6 that are connected in sequence. The stainless steel sleeve 17 has an annular notch, which is located at the corresponding position of the water inlet end of the impeller chamber 5 and the inner end of the water inlet flow channel 4. The sealing ring 3 is embedded in the annular notch, and the sealing ring 3 is sealed and welded to the water inlet end of the impeller chamber 5 flow channel and the inner end of the water inlet flow channel 4 respectively.

[0029] The annular notch allows the bottom of the sealing ring 3 to be embedded in the annular notch, and the contact area between the sealing ring 3 and the stainless steel is welded together to form a seal. Since the bottom of the sealing ring 3 is embedded in the annular notch, the assembly space between the stainless steel sleeve 17, the sealing ring 3, and the water inlet port ring 14 of the impeller 2 is more compact. This not only helps to control the overall volume of the pump body 1, but also helps to control the sealing between the sealing ring 3 and the water inlet port ring 14 of the impeller 2, and the sealing between the sealing ring 3 and the stainless steel sleeve 17, thereby helping to ensure pump efficiency.

[0030] In actual application, the sealing ring 3 has a sealing cavity 7 with a U-shaped cross-section, the water inlet port ring 14 of the impeller 2 is inserted into the sealing cavity 7, and the water inlet port ring 14 is matched with the inner wall gap of the sealing ring 3, the cross-section of the gap is U-shaped, and the gap is the floating sealing gap of the water inlet port ring 14.

[0031] The cross section of the gap is U-shaped, so that the end wall, inner wall and outer wall of the water inlet port ring 14 of the impeller 2 and the inner wall of the U-shaped sealing cavity 7 of the sealing ring 3 all form a sealing channel.

[0032] During specific use, two axial sealing channels are formed between the inner and outer walls of the water inlet port ring 14 of the impeller 2 and the sealing ring 3, and a transverse sealing channel is formed between the end wall of the water inlet port ring 14 of the impeller 2 and the sealing ring 3. After the fluid gap, it first passes through the axial sealing channel at the inner wall of the water inlet port ring 14 of the impeller 2, then passes through the transverse sealing channel at the bottom of the sealing ring 3, and finally passes through the axial sealing channel at the outer wall of the water inlet port ring 14 of the impeller 2, which greatly reduces the flow velocity of the fluid, thereby achieving a sealing effect by cutting off the fluid.

[0033] In actual application, the sealing ring 3 is an integrated structure, including an annular base plate 8, an inner ring plate 9 and an outer ring plate 10 respectively standing on the inner and outer edges of the base plate 8, and the height H2 of the inner ring plate 9 is greater than the height H1 of the outer ring plate 10.

[0034] Since the fluid first enters the axial sealing channel at the inner wall of the water inlet port ring 14 of the impeller 2, the height H2 of the inner ring plate 9 is greater than the height H1 of the outer ring plate 10, so that the path of the axial sealing channel at the inner wall of the water inlet port ring 14 is longer, thereby achieving an effective sealing effect.

[0035] In actual use, the gap between the water inlet port ring 14 and the bottom plate 8 is L1, the gap between the water inlet port ring 14 and the inner ring plate 9 is L2, and the gap between the water inlet port ring 14 and the outer ring plate 10 is L3, with both L2 and L3 being smaller than L2. In other words, the transverse sealing channel at the bottom of the sealing ring 3 has a larger cross-section, allowing more fluid to flow within the transverse sealing channel, which helps dilute the fluid flow rate, thereby facilitating a cutoff effect on the fluid in the gap and improving the sealing effect.

[0036] In actual application, L1 is 1mm-2mm, L2 is 0.5mm, L3 is 0.4mm, H1 is 5mm, and H2 is 6mm. Of course, if the size fluctuates within a certain range, it also falls within the scope of protection of this utility model.

[0037] In actual application, the pump body 1 has a connecting ring 11, and the stainless steel sleeve 17 extends outward from the water inlet, water outlet and connecting ring 11 of the pump body 1 and turns outward to cover the surface of the water inlet end outer wall 12, water outlet end outer wall 13 and the outer end wall of the connecting ring of the pump body 1.

[0038] In actual application, the water inlet and outlet ends of the fluid flow channel are respectively connected to the water inlet and water outlet on the pump body 1. The water inlet and water outlet ends of the pump body 1 and the outer end of the connecting ring 11 need to be connected to the corresponding components. In order to prevent the water inlet, water outlet and outer end of the connecting ring 11 of the pump body 1 from corrosion, the stainless steel sleeve 17 is extended outward and turned outward to cover the corresponding end, so that the various connecting ends of the pump body 1 are also corrosion-resistant, which is further beneficial to improving the service life of the pump body 1.

[0039] In actual use, flanges 15 are provided on the pump body 1 at locations corresponding to the water inlet and outlet, respectively. The outer end surface of each flange 15 has an axially outwardly projecting sealing boss. The stainless steel sleeve 17, corresponding to the water inlet and outlet, is turned outward and covers the sealing boss. The flanges 15 and the sealing bosses are integrally formed with the pump body 1. That is, the water inlet outer wall 12 and the water outlet outer wall 13 both include the outer walls of the corresponding sealing bosses.

[0040] The provision of the flange 15 facilitates the connection between the water inlet and outlet ends of the pump body 1 and the corresponding components. The provision of the sealing boss facilitates connection and facilitates the formation of a nested fit through the yin-yang concave-convex method, thereby ensuring the sealing of the connection. The stainless steel sleeve 17 covers at least the sealing boss, which facilitates the sealing of the parts that may come into contact with the fluid through the stainless steel sleeve 17. In order to further increase the corrosion resistance of the pump body 1, the stainless steel sleeve 17 can also extend radially outward to cover a larger area of ​​the end face. The stainless steel sleeve 17 further covers the parts that may come into contact with the fluid, making the pump body 1 more corrosion-resistant.

[0041] In practical applications, the connection portion between the sealing boss and the fluid flow channel is a chamfered structure 16 , and the connection portion between the everted portion of the stainless steel sleeve 17 and the fluid flow channel is a chamfered structure 16 .

[0042] By providing a chamfered structure 16 (which can be a chamfer or a rounded corner), the incoming fluid can pass through the fluid flow channel (inflow or outflow) more smoothly, avoiding obstruction of the fluid by right angles, reducing hydraulic loss, and thus helping to ensure the efficiency of the water pump.

[0043] Example 2: The technical solution of the second technical subject involved in the utility model: a pump with a pump body whose flow channel surface is covered with a stainless steel sleeve, comprising a pump body 1 with an impeller 2 inside, a connecting piece connected to the connecting ring 11 on the pump body 1, and a motor connected to the connecting piece, wherein the rotating shaft on the motor penetrates into the pump body 1 to form a connection with the impeller 2, and is characterized in that the pump body 1 is the pump body with a flow channel surface covered with a stainless steel sleeve as described in Example 1.

[0044] This technical solution has all the beneficial technical effects of the technical solution of the first technical subject.

[0045] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Various modifications and variations are possible in the above embodiments. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A pump body with a flow channel surface covered with a stainless steel sleeve, comprising a pump body (1), a fluid flow channel arranged in the pump body (1), and an impeller (2) arranged in the pump body (1) and cooperating with the fluid flow channel, characterized in that The inner wall of the fluid flow channel is covered with a stainless steel sleeve (17), and the stainless steel sleeve (17) is used to isolate the fluid from direct contact with the pump body (1); The water inlet port ring (14) of the impeller (2) is matched with a sealing ring (3), and the sealing ring (3) is fixedly and sealedly matched with the stainless steel sleeve (17); The fluid flow channel comprises an inlet flow channel (4), an impeller chamber (5) and an outlet flow channel (6) which are connected in sequence. The stainless steel sleeve (17) has an annular notch, which is located at the corresponding position of the water inlet end of the impeller chamber (5) and the inner end of the water inlet flow channel (4). The sealing ring (3) is embedded in the annular notch. The sealing ring (3) is sealed and welded to the water inlet end of the impeller chamber (5) flow channel and the inner end of the water inlet flow channel (4).

2. The pump body with a stainless steel sleeve covering the flow channel surface according to claim 1, characterized in that The sealing ring (3) has a sealing cavity (7) with a U-shaped cross section, the water inlet port ring (14) of the impeller (2) is inserted into the sealing cavity (7), and the water inlet port ring (14) is gap-matched with the inner wall of the sealing ring (3), the cross section of the gap being U-shaped, and the gap being a floating sealing gap of the water inlet port ring (14).

3. The pump body with a flow channel surface covered with a stainless steel sleeve according to claim 2, characterized in that The sealing ring (3) is an integral structure, comprising an annular base plate (8), an inner ring plate (9) and an outer ring plate (10) respectively standing on the inner and outer edges of the base plate (8), wherein the height H2 of the inner ring plate (9) is greater than the height H1 of the outer ring plate (10).

4. The pump body with a flow channel surface covered with a stainless steel sleeve according to claim 3, characterized in that The gap between the water inlet port ring (14) and the bottom plate (8) is L1, the gap between the water inlet port ring (14) and the inner ring plate (9) is L2, and the gap between the water inlet port ring (14) and the outer ring plate (10) is L3, and both L2 and L3 are smaller than L2.

5. The pump body with a flow channel surface covered with a stainless steel sleeve according to any one of claims 1 to 4, characterized in that The pump body (1) is provided with a connecting ring (11), and the stainless steel sleeve (17) extends outward from the water inlet, water outlet and connecting ring (11) of the pump body (1) and turns outward to cover the surface of the water inlet end outer wall (12), the water outlet end outer wall (13) and the outer end wall of the connecting ring of the pump body (1).

6. The pump body with a flow channel surface covered with a stainless steel sleeve according to claim 5, characterized in that Flanges (15) are provided on the pump body (1) at locations corresponding to the water inlet and the water outlet, respectively. The outer end surface of each flange (15) has an axially outwardly protruding sealing boss. The stainless steel sleeve (17) is turned outward and covers the sealing boss at locations corresponding to the water inlet and the water outlet. The flange (15) and the sealing boss are both an integral structure with the pump body (1).

7. The pump body with a flow channel surface covered with a stainless steel sleeve according to claim 6, characterized in that The connection portion between the sealing boss and the fluid flow channel is a chamfered structure (16), and the connection portion between the everted portion of the stainless steel sleeve (17) and the fluid flow channel is a chamfered structure (16).

8. A pump having a pump body with a stainless steel sleeve covering the surface of the flow channel, comprising a pump body (1) with an impeller (2) provided therein, a coupling member connected to a connecting ring (11) on the pump body (1), and a motor connected to the coupling member, wherein a rotating shaft on the motor is inserted into the pump body (1) to form a connection with the impeller (2), characterized in that The pump body (1) is a pump body according to any one of claims 1 to 7, the flow channel surface of which is covered with a stainless steel sleeve (17).

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