Sealed multistage pump

Abstract

The utility model discloses a sealed multi-stage pump which comprises a pump body, a transmission mechanism, a turbulent flow mechanism and a sealing mechanism. The sealing mechanism at least comprises a plurality of stages of flow guide bodies and a filter cover which are sequentially clamped on the pump body, one stage of flow guide body is clamped on the pump body, the inner wall of the flow guide body is bent towards the axis to form a curled edge, a sealing ring is arranged in the curled edge and is in interference fit with the curled edge, and the end face of the sealing ring is not lower than the upper end face of the flow guide body so as to abut against the lower end face of the last flow guide body; the pump body and the filter cover are connected through a fixing piece so that the multi-stage flow guiding body can be locked on the pump body, and the transmission mechanism drives the flow disturbing mechanism to rotate so that extracted liquid can be conveyed to the pump body through the multi-stage flow guiding body and can be discharged through a water outlet body on the pump body. According to the utility model, the sealing ring is placed in the curled edge, and meanwhile, the curled edge is propped against the lower end surface of the upper garment flow guide body, so that the sealing effect is realized, the pressure and the corrosion of the sealing ring are reduced, the sealing property is ensured, and the service life is greatly prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to fluid machinery technical field, concretely relates to a sealed multistage pump. BACKGROUND

[0002] Pump is the mechanical of conveying fluid or making fluid pressure increasing. It transmits the mechanical energy of prime mover or other external energy to liquid, and makes liquid energy increase. Pump is mainly used to convey liquid such as water, oil, acid and alkali liquid, emulsion, suspension emulsion and liquid metal, and also can convey liquid, gas mixture and liquid containing suspended solid.

[0003] At present, since the sealing property between guide vanes of sheet metal multistage pump is one of key factors influencing overall performance and service life of pump, when sealing multistage pump, sealing ring is usually placed between guide vanes to realize that liquid cannot flow out from between guide vanes in the process of liquid conduction.

[0004] However, due to high pressure in multistage pump and reasons of conveying various chemical media, sealing ring is extremely easy to fail under long-term high pressure and corrosion environment because of being arranged on guide vane contact surface, and then sealing property cannot be guaranteed. CONTENT OF UTILITY MODEL

[0005] Based on this, the utility model aims at providing a sealed multistage pump, and aims at solving the problem that sealing ring is extremely easy to fail under long-term high pressure and corrosion environment because of being arranged on guide vane contact surface due to high pressure in multistage pump and reasons of conveying various chemical media, and then sealing property cannot be guaranteed.

[0006] To achieve the above-mentioned purpose, the utility model realizes through the following technical scheme: a sealed multistage pump, the sealed multistage pump includes pump body, transmission mechanism arranged in the pump body, spoiler mechanism arranged on the transmission mechanism and sealing mechanism for sealing the spoiler mechanism;

[0007] Sealing mechanism at least includes several levels of guide vanes and filter cover that are clamped on the pump body in turn, the first level of guide vanes is clamped on the pump body, the inner wall of the guide vane is curved with a curled edge towards the shaft center, the curled edge is provided with a sealing ring, the sealing ring is interference fit with the curled edge, the end face of the sealing ring is not lower than the upper end face of the guide vane, so as to abut against the lower end face of the previous guide vane, the sealing ring includes ring body and convex edge arranged on the inner periphery of the ring body, the side plane of the convex edge is not lower than the side plane of the curled edge;

[0008] Among them, the pump body and the filter cover are connected through a fixing piece to lock the multistage guide vanes on the pump body, the transmission mechanism drives the spoiler mechanism to rotate to extract liquid transmitted by the multistage guide vanes to the pump body and discharged by the water outlet on the pump body.

[0009] In summary, according to the utility model discloses a kind of sealed multistage pump, by in the inner wall of flow guide body towards the bending of axis, to form hem, and can be placed in hem sealing ring, simultaneously by hem abutting to the lower end surface of shirt flow guide body, to realize sealing effect further, reduce the pressure and corrosiveness that sealing ring is subjected to, also ensure sealing, greatly prolong service life.Specifically, sealing mechanism, at least including sequentially clamped on pump body several stages flow guide body and filter cover, first stage flow guide body is clamped on pump body, flow guide body inner wall is curved with hem towards axis, hem is equipped with sealing ring, sealing ring and hem interference fit, sealing ring end surface is not lower than the upper end surface of flow guide body, to abut to the lower end surface of previous flow guide body, pump body and filter cover are connected by a fixing piece, to lock several stages flow guide body on pump body, transmission mechanism drives turbulence mechanism rotation, to extract liquid by several stages flow guide body transmission to pump body and by through the water outlet body on pump body discharge.

[0010] According to an aspect of the above technical solution, the flow guide body includes an inner wall, a bottom cover provided at one end of the inner wall away from the hem, and a right-angle-shaped clamping portion provided between the bottom cover and the inner wall.

[0011] According to an aspect of the above technical solution, the width of the hem is equal to the width of the clamping portion.

[0012] According to an aspect of the above technical solution, the hem includes a planar portion with the same height as the inner wall, and a curved portion for accommodating the sealing ring, the height of the curved portion is lower than that of the planar portion.

[0013] According to an aspect of the above technical solution, the filter cover is provided with a filter screen, one end of the fixing piece is clamped on the filter cover, and the other end is movably connected with the pump body.

[0014] According to an aspect of the above technical solution, the transmission mechanism includes a rotor, a stator provided in the pump body, and a rear end cover and a fan provided on the rotor away from the turbulence mechanism, one end of the rotor drives the turbulence mechanism to rotate.

[0015] According to an aspect of the above technical solution, the turbulence mechanism includes a plurality of impellers provided on the rotor in sequence, and an inducer rotating in the filter cover, the impellers and the flow guide bodies are one-to-one correspondingly arranged.

[0016] Additional aspects and advantages of the utility model will be partially given in the following description, some will become apparent from the following description, or be understood through practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the structure schematic view of sealed multistage pump in the utility model embodiment one;

[0018] Figure 2 It is the sectional view schematic diagram of the sealed multistage pump in the embodiment one of the utility model;

[0019] Figure 3 It is the sectional view of the flow guide in the embodiment one of the utility model;

[0020] Figure 4 It is Figure 3 The enlarged schematic view in A place in middle;

[0021] Figure 5 It is the sectional view of the sealing ring in the embodiment one of the utility model;

[0022] Figure 6 It is Figure 5 The enlarged schematic view in B place in middle;

[0023] Figure 7 It is the structural schematic view of a filter cover in the embodiment of the utility model;

[0024] Figure 8 It is the sectional view of the sealing ring in the embodiment two of the utility model;

[0025] Figure 9 It is the sectional view of the sealing ring in the embodiment three of the utility model.

[0026] Explanation of the symbols of the drawing components:

[0027] Pump body 100, terminal box 110, water outlet body 120, sealing mechanism 200, flow guide 210, inner wall 211, edge curl 222, flat part 2221, curved part 2222, bottom cover 223, clamping part 2231, sealing ring 220, ring body 221, convex edge 222, filter cover 230, filter screen 231, fixed groove 232, transmission mechanism 300, stator 310, rotor 320, rear end cover 330, fan 340, fan cover 350, turbulence mechanism 400, impeller 410, inducer 420, fixing part 500. Specific implementation

[0028] In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, the specific implementation of the utility model is described in detail below by combining with the drawings. The drawings show several embodiments of the utility model. However, the utility model can be realized in many different forms, and is not limited to the embodiments described in this paper. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0029] It is to be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. As used herein the terms "vertical", "horizontal", "left", "right", "upper", "lower", and the like are used for clarity to provide relative position description and are not to be construed as limiting the present application to any particular spatial orientation.

[0030] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0031] Embodiment one

[0032] Please refer to Figures 1-7 , it is a structure diagram of a sealed multi-stage pump proposed in the embodiment one of the present application, the sealed multi-stage pump comprises a pump body 100, a transmission mechanism 300 arranged in the pump body 100, a disturbance mechanism 400 arranged on the transmission mechanism 300, and a sealing mechanism 200 for sealing the disturbance mechanism 400, wherein:

[0033] In order to drive the disturbance mechanism 400 to rotate and realize the liquid conducting function, the transmission mechanism 300 comprises a rotor 320 arranged at one end of the pump body 100, a stator 310, and a rear end cover 330 and a fan 340 arranged at the end of the rotor 320 away from the disturbance mechanism 400. The rear end cover 330 is used to seal the rotor 320 in the pump body 100, and the design of the fan cover 350 and the fan 340 can be used to cool the rotor 320, so as to avoid the high-temperature burnout of the device of the transmission mechanism 300.

[0034] Further, a terminal box 110 and a water outlet body 120 are arranged on both sides of the pump body 100 respectively, the terminal box 110 can be used for power supply or connected to other devices for cooperation, and the water outlet body 120 is connected to the sealing mechanism 200 for discharging liquid.

[0035] Because the internal pressure of the multi-stage pump is extremely high, especially in the high pressure section (between the last stage flow guide 210 and the water outlet body 120), the requirement for the sealing material is very strict. The sealing member needs to maintain good sealing performance in the high pressure environment to prevent fluid leakage, which requires the selection of a sealing material with high pressure resistance and good elastic recovery performance. At the same time, the multi-stage pump is often used to transport various chemical media, which may have strong corrosive properties. The sealing material must have excellent chemical corrosion resistance to prevent corrosion and leakage.

[0036] To achieve the above requirements, the sealing mechanism 200 at least includes a plurality of stages of flow guides 210 and filter covers 230 which are sequentially clamped on the pump body 100. The first stage flow guide 210 is clamped on the pump body 100, the inner wall 211 of the flow guide 210 is curved towards the shaft center with a curled edge 222, the curled edge 222 is provided with a sealing ring 220, the sealing ring 220 is in interference fit with the curled edge 222, and the end face of the sealing ring 220 is not lower than the upper end face of the flow guide 210, so as to abut against the lower end face of the upper flow guide 210.

[0037] Further, the flow guide 210 includes an inner wall 211, a bottom cover 223 provided at one end of the inner wall 211 away from the curled edge 222, and a right-angled clamping portion 2231 provided between the bottom cover 223 and the inner wall 211. In this embodiment, the width of the curled edge 222 is equal to the width of the clamping portion 2231, so that the lower flow guide 210 and the upper flow guide 210 are clamped in time, and the side edge of the curled edge 222 abuts against the right-angled clamping portion 2231, thereby wrapping the sealing ring 220 provided in the curled edge 222 between the upper and lower flow guides 210.

[0038] It is worth noting that the curled edge 222 includes a planar portion 2221 with the same height as the inner wall 211, and a curved portion 2222 for accommodating the sealing ring 220, the height of the curved portion 2222 being lower than that of the planar portion 2221 for accommodating the sealing ring 220. The sealing ring 220 further includes a ring body 221 and a convex edge 222 provided on the inner periphery of the ring body 221, the convex edge 222 being provided at one end of the curved portion 2222 away from the planar portion 2221, and the side plane of the convex edge 222 being not lower than the side plane of the curved portion 2222. When the sealing ring 220 is placed in the curved portion 2222, the end face of the sealing ring 220 is not lower than the height of the planar portion 2221, and the side plane of the convex edge 222 is not lower than the side plane of the curved portion 2222, so that when the flow guide 210 is clamped on the pump body 100 or the previous flow guide 210, the end face and the side edge of the sealing ring 220 respectively abut against the two sides of the right-angled clamping portion 2231, thereby achieving the sealing effect. At the same time, due to the wrapping of the curled edge 222 to the sealing ring 220, the pressure and corrosiveness received by the sealing ring 220 are reduced, thereby prolonging the service life of the sealing ring 220 and ensuring the sealing effect.

[0039] In order to play a filtering effect, the filter cover 230 is provided with a filter screen 231 on the side wall and the bottom, so as to reduce the impurities in the liquid. Meanwhile, since the filter cover 230 and the pump body 100 are provided with several levels of flow guides 210, in order to fix the several levels of flow guides 210, the sealing ring 220 is in interference fit with the flange 222, several fixing grooves 232 are equidistantly arranged along the circumference of the bottom of the filter cover 230, and one end of a fixing member 500 is hooked in the fixing groove 232, and the other end is screwed with the pump body 100, so as to fix the filter cover 230 and the several levels of flow guides 210 on the pump body 100.

[0040] In order to realize the liquid conducting function, the flow disturbance mechanism 400 comprises several impellers 410 arranged on the rotor 320 in sequence, and an inducer 420 rotating in the filter cover 230, and the impeller 410 and the flow guide 210 are arranged one by one. In the embodiment, each impeller 410 is arranged at the center of a flow guide 210, and the number of the flow guide 210 and the impeller 410 is 3. Due to the inclined arrangement of the inducer 420, the liquid can be extracted from the outside by driving the inducer 420 to rotate, so as to conduct.

[0041] In summary, according to the sealed multi-stage pump provided by the utility model, the inner wall of the flow guide is bent towards the shaft center to form a flange, and the sealing ring can be placed in the flange, the flange is abutted to the lower end surface of the upper flow guide, and the sealing effect is realized, the pressure and corrosiveness of the sealing ring are reduced, the sealing property is ensured, and the service life is greatly prolonged. Specifically, the sealing mechanism comprises several levels of flow guides and a filter cover which are sequentially clamped on a pump body, a first level of flow guide is clamped on the pump body, the inner wall of the flow guide is bent towards the shaft center to form a flange, the sealing ring is arranged in the flange, the sealing ring is in interference fit with the flange, the end surface of the sealing ring is not lower than the upper end surface of the flow guide, the sealing ring is abutted to the lower end surface of the upper flow guide, the pump body and the filter cover are connected by a fixing member, the multi-stage flow guide is locked on the pump body, the transmission mechanism drives the flow disturbance mechanism to rotate, the liquid is extracted by the multi-stage flow guide, transmitted to the pump body, and discharged by the water outlet on the pump body.

[0042] Embodiment two

[0043] Please refer to Figure 8 , which is a cross-sectional view of the sealing ring in embodiment two. Different from the design direction of the flange in embodiment one, the flange is arranged on the outer circumference of the sealing ring, so as to realize the double sealing effect and prevent the sealing ring from falling off.

[0044] Embodiment three

[0045] Please refer to Figure 9, as shown in the cross-sectional view of the sealing ring in Example 3, and different from Example 1, a sealing gasket is further arranged on the side of the ring body away from the convex edge, and through the cooperation of the sealing gasket and the convex edge, a double sealing effect can be achieved.

[0046] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0047] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the present application. It should be pointed out that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A seal for a multi-stage pump, characterized by, The sealed multi-stage pump comprises a pump body, a transmission mechanism arranged in the pump body, a turbulence mechanism arranged on the transmission mechanism, and a sealing mechanism for sealing the turbulence mechanism; The sealing mechanism comprises a plurality of stages of flow guide bodies and filter covers which are sequentially clamped on the pump body, the first stage of flow guide bodies being clamped on the pump body, the inner wall of the flow guide body being bent towards the shaft center with a curled edge, a sealing ring being arranged in the curled edge, the sealing ring being in interference fit with the curled edge, the end surface of the sealing ring being not lower than the upper end surface of the flow guide body so as to abut against the lower end surface of the previous flow guide body, the sealing ring comprising a ring body and a convex edge arranged on the inner periphery of the ring body, the side surface of the convex edge being not lower than the side surface of the curled edge; The pump body and the filter cover are connected through a fixing member to lock the plurality of stages of flow guide bodies on the pump body, the transmission mechanism drives the rotation of the turbulence mechanism to extract liquid which is transmitted by the plurality of stages of flow guide bodies to the pump body and discharged through the water outlet on the pump body.

2. The sealed multi-stage pump of claim 1, wherein, The flow guide body comprises an inner wall and a bottom cover arranged at one end of the inner wall away from the curled edge, a right-angled clamping portion being arranged between the bottom cover and the inner wall.

3. The sealed multi-stage pump of claim 2, wherein, The width of the curled edge is equal to the width of the clamping portion.

4. The sealed multi-stage pump of claim 3, wherein, The curled edge comprises a planar portion which is in the same height as the inner wall and a curved portion for accommodating the sealing ring, the height of the curved portion being lower than that of the planar portion.

5. The sealed multi-stage pump of claim 1, wherein, The filter cover is provided with a filter screen, one end of the fixing member being clamped on the filter cover and the other end being movably connected with the pump body.

6. The sealed multi-stage pump of claim 1, wherein, The transmission mechanism comprises a rotor, a stator arranged in the pump body, and a rear end cover and a fan arranged on the rotor away from the turbulence mechanism, one end of the rotor driving the rotation of the turbulence mechanism.

7. The sealed multi-stage pump of claim 6, wherein, The turbulence mechanism comprises a plurality of impellers which are sequentially arranged on the rotor and an inducer which rotates in the filter cover, the impellers and the flow guide bodies being arranged one by one.

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