Pump head assembly method

Abstract

A pump head assembly method, the assembly method comprising the following steps: step 1, assembling the rotor assembly; sleeve the impeller seat and the impeller on the tooling shaft so that the axes of the impeller seat and the impeller coincide; then bonding the bottom of the impeller and the top of the impeller seat together; finally, pulling the tooling shaft out of the lower end of the center hole of the impeller seat; step 2, assembling the rotor support; installing the rotor support in the lower shell so that the rotor support is located at the bottom center of the lower shell; step 3, fixing the lower shell; placing the lower shell on the base of the pump shell pressing device so that the lower shell is located in the pump shell mounting groove on the base; step 4, installing the rotor assembly on the rotor support; step 5, covering the top cover; after applying adhesive at the bonding point between the top cover and the lower shell, covering the top cover on the lower shell, and then pressing the top cover on the lower shell by the pressing mechanism of the pump shell pressing device. This assembly method can ensure that the impeller and the impeller seat are concentric, and at the same time ensure that the top cover and the lower shell are tightly fitted.

Description

Technical Field

[0001] The invention relates to the field of magnetic suspension centrifugal pump assembly, in particular to a pump head assembly method. Background Art

[0002] like Figures 1-3 The pump head of the magnetic levitation centrifugal pump shown includes a pump housing and a rotor assembly and a rotor support 106 disposed in the pump housing;

[0003] The pump casing is a volute-type pump casing, comprising a lower casing 108 with a liquid outlet pipe bottom 103 and a top cover 109 with a liquid outlet pipe top 102. A liquid inlet pipe 101 is vertically positioned at the top center of the top cover 109. The liquid outlet pipe bottom 103 is integrally formed with the lower casing 108; the liquid outlet pipe top 102, the liquid inlet pipe 101, and the top cover 109 are integrally formed. When the top cover 109 is attached to the lower casing 108, a rotor accommodating chamber is formed between the top cover 109 and the lower casing 108. A liquid outlet channel is formed between the liquid outlet pipe bottom 103 and the liquid outlet pipe top 102, and the liquid outlet channel is disposed around the rotor accommodating chamber.

[0004] The rotor assembly is arranged in the rotor accommodating cavity, and the rotor assembly includes an impeller 110 and an impeller seat 104; an impeller center hole 111 is opened on the impeller 110, and an impeller seat center hole 112 is opened on the impeller seat 104; the diameters of the impeller center hole 111 and the impeller seat center hole 112 are equal; a plurality of permanent magnets 107 are arranged in a circle in the impeller seat 104; a connecting member 105 is arranged in the impeller seat center hole 112, and the connecting member 105 includes a connecting head 1051 and a plurality of connecting rods 1052, the connecting head 1051 is located at the center of the impeller seat center hole 112, there are three connecting rods 1052, which are evenly spaced around and parallel to the diameter of the impeller seat center hole 112, one end of the connecting rod 1052 is connected to the connecting head 1051, and the other end is connected to the inner wall of the impeller seat center hole 112; the connecting member 105 and the impeller seat 104 are integrally formed.

[0005] The rotor support 106 is a ball head seat; the bottom of the connector 1051 is provided with a ball socket, and the ball head of the ball head seat can be set in the ball socket, so that the rotor assembly can rotate on the rotor support 106 to avoid the rotor assembly from deviating in the pump housing.

[0006] Magnetic levitation centrifugal pumps are often made of plastic. During the design and experimental stage, in order to save costs, medical glue is generally used to bond the upper and lower pump casings. The assembly process is as follows:

[0007] First, assemble the rotor assembly, and directly assemble the impeller 110 and the impeller seat 104 together by bonding; then assemble the rotor support 106, and install the rotor support 106 in the lower shell 108, so that the rotor support is located at the bottom center of the lower shell 108; then movably set the rotor assembly on the rotor support 106, and movably set the rotor connector 105 in the center hole 112 of the impeller seat on the rotor support 106; finally, cover the top cover 109 on the lower shell 108 and connect them by bonding.

[0008] During the above assembly process, the impeller 110 and the impeller seat 104 are directly bonded together, and there is no way to ensure that the impeller 110 and the impeller seat 104 are concentric. If they are not concentric, the rotor assembly will not rotate smoothly; the top cover 109 is directly covered on the lower shell 108, and no long-term pressing is performed. During the adhesive solidification process, it cannot be ensured that the top cover 109 and the lower shell 108 are tightly fitted, causing the pump head to leak during operation. Summary of the Invention

[0009] The object of the present invention is to provide a pump head assembly method to address the above-mentioned problems, which can ensure that the impeller and the impeller seat are concentric and at the same time ensure that the top cover and the lower shell are tightly fitted.

[0010] The technical solution adopted in the present invention is as follows:

[0011] A pump head assembly method, comprising the following steps:

[0012] Step 1: assemble the rotor assembly;

[0013] Install the permanent magnet into the impeller seat from the top, insert the upper end of the tooling shaft into the center hole of the impeller seat from the bottom of the impeller seat, pass through the connector in the center hole of the impeller seat, and enter the center hole of the impeller from the bottom of the impeller, so that the impeller seat and impeller are sleeved on the tooling shaft, and the axes of the impeller seat and impeller coincide with each other; then bond the bottom of the impeller and the top of the impeller seat together, and cover the impeller seat with the permanent magnet; finally, pull the tooling shaft out from the lower end of the center hole of the impeller seat;

[0014] Step 2: assemble the rotor support;

[0015] Install the rotor support member in the lower housing so that the rotor support member is located at the bottom center of the lower housing;

[0016] Step 3: Fix the lower shell;

[0017] Place the lower casing on the base of the pump casing pressing device so that the lower casing is located in the pump casing installation groove on the base;

[0018] Step 4: Install the rotor assembly on the rotor support;

[0019] The rotor connecting piece in the center hole of the impeller seat is movably arranged on the rotor supporting piece;

[0020] Step 5: Cover the top cover;

[0021] After applying adhesive on the bonding position of the top cover and the lower shell, the top cover is placed on the lower shell, and then the top cover is pressed tightly on the lower shell by the pressing mechanism of the pump shell pressing device.

[0022] Furthermore, the diameter of the tooling shaft matches the center hole of the impeller seat and the center hole of the impeller; the upper end of the tooling shaft is provided with a connector receiving hole and a plurality of connecting rod receiving grooves; the axis of the connector receiving hole coincides with the axis of the tooling shaft; the number of the connecting rod receiving grooves is equal to the number of connecting rods, and the connecting rod receiving grooves are arranged at equal intervals around the connector receiving hole. The top, inner end and outer end of the connecting rod receiving groove are all open, and the connecting rod receiving groove extends along the radial direction of the tooling shaft, the inner end of which extends to the connector receiving hole and is connected to the joint receiving hole, and the outer end of which extends to the edge of the tooling shaft;

[0023] When the upper end of the tooling shaft is inserted into the center hole of the impeller seat from the bottom of the impeller seat, the connecting rod of the connecting piece is embedded in the connecting rod accommodating groove, and the connecting head of the connecting piece is embedded in the connecting head accommodating hole, so that the upper end of the tooling shaft passes through the connecting piece in the center hole of the impeller seat, and then enters the center hole of the impeller from the bottom of the impeller.

[0024] Furthermore, the width of the connecting rod receiving groove is greater than the width or diameter of the connecting rod, and the diameter of the connecting head receiving hole is greater than the diameter of the connecting head;

[0025] The depth of the connecting rod receiving groove is greater than the thickness or diameter of the connecting rod, the connecting head receiving hole is a blind hole with an open top, and the depth of the connecting head receiving hole is greater than the depth of the connecting rod receiving groove;

[0026] Or the depth of the connecting rod accommodating groove is greater than the thickness or diameter of the connecting rod, and the connecting head accommodating hole is a through hole that passes through the upper end and the lower end of the tooling shaft.

[0027] Furthermore, a chamfer is provided on the top of the connector receiving hole; and a chamfer is provided on the top of the connecting rod receiving groove.

[0028] The top of the pump casing is provided with a pump casing mounting groove; the pressing mechanism includes a pressure cover, a center rod and a sleeve; a plurality of vertical rods are provided on the base; the vertical rods are vertically arranged, the lower end of the vertical rods is fixedly connected to the base and is located outside the pump casing mounting groove, and the vertical rods are spaced around the pump casing mounting groove; the upper end of the vertical rods passes through the pressure cover, so that the pressure cover is movably sleeved on the vertical rod, so that the pressure cover can move up and down along the vertical rod; the center rod is vertically arranged under the pressure cover, the upper end of the center rod is fixedly connected to the pressure cover; the sleeve is vertically arranged under the pressure cover, the upper end of the sleeve is fixedly connected to the pressure cover; the sleeve is sleeved outside the center rod; the inner diameter of the sleeve is larger than the outer diameter of the liquid inlet pipe; the diameter of the center rod matches the inner diameter of the inlet end of the liquid inlet pipe; the axis of the center rod vertically passes through the bottom center of the pump casing mounting groove;

[0029] When the lower casing is located in the pump casing mounting groove and the top cover is placed on the lower casing, the gland moves downward so that the lower end of the center rod on the gland is inserted into the liquid inlet pipe, the lower end of the sleeve is sleeved outside the liquid inlet pipe, and the lower end of the sleeve is pressed on the top cover to press the top cover tightly onto the lower casing.

[0030] Furthermore, the upper end of the center rod is fixedly connected to the center of the gland, and the axis of the sleeve coincides with the axis of the center rod.

[0031] Furthermore, the pump casing mounting groove is opened at the top center of the base, and the pump casing mounting groove is a circular groove.

[0032] Furthermore, an unloading hole is opened at the center of the bottom of the shell installation groove, and the unloading hole passes through the bottom of the pump shell installation groove.

[0033] Furthermore, a notch for extending the pipeline is provided on one side of the pump casing mounting groove.

[0034] Furthermore, there are at least two upright poles.

[0035] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0036] In the assembly method of the present invention, since the impeller and impeller seat are sleeved on the tooling shaft, the impeller and impeller seat are ensured to be concentric during bonding, preventing the assembled rotor assembly from rotating unsteadily during operation. Furthermore, due to the presence of the pump casing pressing device, its pressing mechanism can press the top cover against the lower casing, ensuring a tight fit between the top cover and the lower casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a cross-sectional view of the pump head;

[0038] Figure 2 This is the structural diagram of the pump casing;

[0039] Figure 3 This is a structural diagram showing the connecting piece being arranged in the center hole of the impeller seat;

[0040] Figure 4 It is the structural diagram of the tooling shaft;

[0041] Figure 5 A structural diagram showing that the tops of the connector receiving hole and the connecting rod receiving groove are chamfered;

[0042] Figure 6 It is a cross-sectional view of the pump casing pressing device;

[0043] Figure 7 This is a three-dimensional view of the pump casing pressing device. DETAILED DESCRIPTION

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0045] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0046] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other.

[0047] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0048] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is typically placed when in use, or are the orientations or positional relationships commonly understood by those skilled in the art. These terms are intended only to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0049] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0050] like Figures 1 to 7 As shown, the present invention discloses a pump head assembly method, which includes the following steps:

[0051] Step 1: assemble the rotor assembly;

[0052] Install the permanent magnet 107 into the impeller seat 104 from the top of the impeller seat 104, so that multiple permanent magnets 107 are arranged at intervals and surround the center of the impeller seat 104; insert the upper end of the tooling shaft 2 into the impeller seat center hole 112 from the bottom of the impeller seat 104, and pass through the connecting piece 105 in the impeller seat center hole 112, and enter the impeller center hole 111 from the bottom of the impeller 110, so that the impeller seat 104 and the impeller 110 are sleeved on the tooling shaft 2, so that the axes of the impeller seat 104 and the impeller 110 coincide with each other; then apply adhesive to the bonding area between the bottom of the impeller 110 and the top of the impeller seat 104, bond the bottom of the impeller 110 and the top of the impeller seat 104 together, and cover the permanent magnet 107 in the impeller seat 104; finally, pull out the tooling shaft 2 from the lower end of the impeller seat center hole 112;

[0053] Step 2: assemble the rotor support 106;

[0054] Install the rotor support 106 in the lower housing 108 so that the rotor support is located at the bottom center of the lower housing 108;

[0055] Step 3: Fix the lower housing 108;

[0056] Place the lower housing 108 on the base 306 of the pump housing pressing device so that the lower housing 108 is located in the pump housing mounting groove 304 on the base 306, thereby restricting the lower housing 108 from moving in the horizontal direction;

[0057] Step 4: Install the rotor assembly on the rotor support 106;

[0058] The rotor connector 105 in the central hole 112 of the impeller seat is movably arranged on the rotor support 106; the ball head of the ball head seat is arranged in the ball socket at the bottom of the connector 1051;

[0059] Step 5, cover the top cover 109;

[0060] After applying adhesive at the bonding point between the top cover 109 and the lower shell 108, place the top cover 109 on the lower shell 108, and then press the top cover 109 onto the lower shell 108 through the pressing mechanism of the pump shell pressing device; press for a certain period of time, and after the adhesive solidifies, lift the pressing mechanism, and the entire assembled pump head can be taken out from the pump shell mounting groove 304, completing the assembly of the pump head.

[0061] In the above assembly method, since impeller 110 and impeller seat 104 are sleeved onto tooling shaft 2, they are ensured to be concentric during bonding, preventing the assembled rotor assembly from rotating unsteadily during operation. Furthermore, due to the presence of the pump casing pressing device, its pressing mechanism can press top cover 109 against lower casing 108, ensuring a tight fit between the top cover 109 and lower casing 108.

[0062] Furthermore, the diameter of the tooling shaft 2 matches the impeller seat center hole 112 and the impeller center hole 111; Figure 4 、 5 As shown, a connector receiving hole 202 and a plurality of connecting rod receiving grooves 201 are provided at the upper end of the tooling shaft 2; the axis of the connector receiving hole 202 coincides with the axis of the tooling shaft 2; the number of the connecting rod receiving grooves 201 is equal to the number of the connecting rods 1052, and the connecting rod receiving grooves 201 are arranged at equal intervals around the connector receiving hole 202. The top, inner end and outer end of the connecting rod receiving groove 201 are all open, and the connecting rod receiving groove 201 extends along the radial direction of the tooling shaft 2, and the inner end thereof extends to the connector receiving hole 202 and is connected to the joint receiving hole, so that a notch appears on the side of the connector receiving hole 202, and the outer end thereof extends to the edge of the tooling shaft 2, so that a notch appears on the edge of the tooling shaft 2;

[0063] When the upper end of the tooling shaft 2 is inserted into the center hole 112 of the impeller seat from the bottom of the impeller seat 104, the connecting rod 1052 of the connecting member 105 is embedded in the connecting rod accommodating groove 201, and the connecting head 1051 of the connecting member 105 is embedded in the connecting head accommodating hole 202, so that the upper end of the tooling shaft 2 passes through the connecting member 105 in the center hole 112 of the impeller seat, and then enters the impeller center hole 111 from the bottom of the impeller 110.

[0064] Because the impeller seat center hole 112 contains the connector 105, the conventional tooling shaft 2 cannot pass through the connector 105. Consequently, the conventional assembly method for the impeller 110 and the impeller seat 104 can only be directly bonded. However, the tooling shaft 2 of the present invention, having a connector receiving hole 202 and a plurality of connecting rod receiving grooves 201 at its upper end, can pass through the connector 105, allowing the impeller 110 and the impeller seat 104 to be sleeved on the tooling shaft 2, ensuring the concentricity of the impeller 110 and the impeller seat 104. In actual use, the length of the tooling shaft 2 should be greater than the length of the impeller seat center hole 112.

[0065] Furthermore, the width of the connecting rod receiving groove 201 is greater than the width or diameter of the connecting rod 1052 , and the diameter of the connecting head receiving hole 202 is greater than the diameter of the connecting head 1051 ;

[0066] The depth of the connecting rod receiving groove 201 is greater than the thickness or diameter of the connecting rod 1052. The connector receiving hole 202 is a blind hole with an open top. The depth of the connector receiving hole 202 is greater than the depth of the connecting rod receiving groove 201.

[0067] Or the depth of the connecting rod accommodating groove 201 is greater than the thickness or diameter of the connecting rod 1052 , and the connecting head accommodating hole 202 is a through hole that passes through the upper end and the lower end of the tooling shaft 2 .

[0068] In the present invention, the connector accommodating hole 202 is a through hole, which is convenient for processing; the depth of the connecting rod accommodating groove 201 is greater than the width or diameter of the connecting rod 1052, and preferably greater than the length of the impeller seat center hole 112, to ensure that the upper end of the tooling shaft 2 can extend out of the impeller seat center hole 112 and insert into the impeller center hole 111.

[0069] Further, such as Figure 5 As shown, the top of the connector receiving hole 202 is chamfered, and the top of the connecting rod receiving groove 201 is chamfered. This makes it easier for the connector 1051 to enter the connector receiving hole 202 and the connecting rod 1052 to enter the connecting rod receiving groove 201.

[0070] Further, such as Figures 6 and 7As shown, the pump casing pressing device includes a base 306 and a pump casing pressing mechanism; a pump casing mounting groove 304 is opened on the top of the base 306; the pressing mechanism includes a gland 301, a center rod 302 and a sleeve 303; a plurality of vertical rods 307 are provided on the base 306; the vertical rods 307 are vertically arranged, the lower ends of the vertical rods 307 are fixedly connected to the base 306 and are located outside the pump casing mounting groove 304, and the vertical rods 307 are spaced around the pump casing mounting groove 304; the upper ends of the vertical rods 307 pass through the gland 301, so that the gland 301 is movably sleeved on the vertical rods 307, so that the gland 301 can move up and down along the vertical rods 307; the center rod 302 is vertically arranged below the gland 301, The upper end of the center rod 302 is fixedly connected to the pressure cover 301; the sleeve 303 is vertically arranged below the pressure cover 301, and the upper end of the sleeve 303 is fixedly connected to the pressure cover 301; the sleeve 303 is sleeved outside the center rod 302; the inner diameter of the sleeve 303 is larger than the outer diameter of the liquid inlet pipe 101, so that the sleeve 303 is sleeved outside the liquid inlet pipe 101, so that the lower end of the sleeve 303 can be pressed on the top cover 109; the diameter of the center rod 302 matches the inner diameter of the inlet end of the liquid inlet pipe 101, so that the lower end of the center rod 302 is inserted into the liquid inlet pipe 101 to prevent the top cover 109 from moving in the horizontal direction; the axis of the center rod 302 vertically passes through the bottom center of the pump casing mounting groove 304;

[0071] When the lower shell 108 is located in the pump shell mounting groove 304 and the top cover 109 is covered on the lower shell 108; the pressure cover 301 moves downward, so that the lower end of the center rod 302 on the pressure cover 301 is inserted into the liquid inlet pipe 101, and the lower end of the sleeve 303 is sleeved on the outside of the liquid inlet pipe 101, so that the lower end of the sleeve 303 is pressed on the top cover 109 to press the top cover 109 onto the lower shell 108.

[0072] Due to the presence of the pump casing mounting groove 304, the lower casing 108 can be restricted from moving in the horizontal direction. The lower end of the center rod 302 is inserted into the liquid inlet pipe 101, which can also restrict the top cover 109 from moving in the horizontal direction, thereby avoiding the top cover 109 and the lower casing 108 from being misaligned in the horizontal direction during the pressing process. Since the axis of the center rod 302 passes vertically through the bottom center of the pump casing mounting groove 304, it can ensure that the top cover 109 and the lower casing 108 are aligned in the center during the pressing process. In actual use, the pressure cover 301 is made of metal. When the pressure cover 301 is not subjected to external force, the pressure cover 301 has a certain weight and can provide a continuous downward force to ensure that the top cover 109 and the lower casing 108 fit tightly.

[0073] Furthermore, the upper end of the central rod 302 is fixedly connected to the center of the gland 301, and the axis of the sleeve 303 coincides with the axis of the central rod 302. Figure 7As shown, in this embodiment, the pressure cover 301 is circular, and the center rod 302 is located at the center of the top cover 109; the axis of the sleeve 303 coincides with the axis of the center rod 302, which can ensure that the lower end of the sleeve 303 presses the middle area of ​​the top cover 109 without pressing the top cover 109 to the left or right, resulting in a gap between the top cover 109 and the lower shell 108.

[0074] Furthermore, the pump housing mounting groove 304 is provided at the top center of the base 306, and the pump housing mounting groove 304 is a circular groove. Figure 7 As shown, the base 306 and the pump housing mounting groove 304 are both circular, and their centers are the same.

[0075] Furthermore, an unloading hole 305 is formed at the center of the bottom of the housing mounting groove, and the unloading hole 305 extends through the bottom of the pump housing mounting groove 304. The unloading hole 305 can reduce the weight of the base 306 and facilitate lifting the bonded pump housing from the pump housing mounting groove 304 through the unloading hole 305, thereby facilitating the removal of the pump housing from the pump housing mounting groove 304.

[0076] Furthermore, a pipe extension notch 308 is opened on one side of the pump housing mounting groove 304 .

[0077] Furthermore, there are at least two vertical poles 307. Figure 7 As shown, in this embodiment, two vertical poles 307 are provided.

[0078] Furthermore, the shape of the lower end surface of the sleeve 303 matches the shape of the top cover 109, so as to ensure that the lower end of the sleeve 303 is stably pressed on the top cover 109. Figure 6 As shown, the middle portion of the top cover 109 is convex upward with a certain curvature, and the lower end surface of the sleeve 303 is a concave curved surface, the curvature of which is consistent with the curvature of the convex middle portion of the top cover 109 .

[0079] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A pump head assembly method, characterized in that: The assembly method comprises the following steps: Step 1: assemble the rotor assembly; The permanent magnet (107) is installed into the impeller seat (104) from the top of the impeller seat (104), and the upper end of the tooling shaft (2) is inserted into the impeller seat center hole (112) from the bottom of the impeller seat (104), and passes through the connecting piece (105) in the impeller seat center hole (112), and enters the impeller center hole (111) from the bottom of the impeller (110), so that the impeller seat (104) and the impeller (110) are sleeved on the tooling shaft (2), so that the axes of the impeller seat (104) and the impeller (110) coincide with each other; then the bottom of the impeller (110) and the top of the impeller seat (104) are bonded together, and the permanent magnet (107) is covered in the impeller seat (104); finally, the tooling shaft (2) is pulled out from the lower end of the impeller seat center hole (112); Step 2, assembling the rotor support (106); Installing the rotor support member (106) in the lower housing (108) so that the rotor support member is located at the bottom center of the lower housing (108); Step 3, fixing the lower housing (108); Place the lower housing (108) on the base (306) of the pump housing pressing device so that the lower housing (108) is located in the pump housing mounting groove (304) on the base (306); Step 4, installing the rotor assembly on the rotor support (106); The rotor connecting member (105) in the central hole (112) of the impeller seat is movably arranged on the rotor supporting member (106); Step 5, cover the top cover (109); After applying adhesive to the bonding portion between the top cover (109) and the lower shell (108), the top cover (109) is placed on the lower shell (108), and then the top cover (109) is pressed against the lower shell (108) by a pressing mechanism of the pump shell pressing device; The connecting member (105) includes a connecting head (1051) and a plurality of connecting rods (1052); The diameter of the tooling shaft (2) matches the center hole (112) of the impeller seat and the center hole (111) of the impeller; the upper end of the tooling shaft (2) is provided with a connector receiving hole (202) and a plurality of connecting rod receiving grooves (201); the axis of the connector receiving hole (202) coincides with the axis of the tooling shaft (2); the number of the connecting rod receiving grooves (201) is equal to the number of the connecting rods (1052); the connecting rod receiving grooves (201) are arranged at equal intervals around the connector receiving hole (202); the top, inner end and outer end of the connecting rod receiving groove (201) are all open; the connecting rod receiving groove (201) extends in the radial direction of the tooling shaft (2); the inner end thereof extends to the connector receiving hole (202) and is connected to the joint receiving hole; the outer end thereof extends to the edge of the tooling shaft (2); When the upper end of the tooling shaft (2) is inserted into the center hole (112) of the impeller seat from the bottom of the impeller seat (104), the connecting rod (1052) of the connecting member (105) is embedded in the connecting rod receiving groove (201), and the connecting head (1051) of the connecting member (105) is embedded in the connecting head receiving hole (202), so that the upper end of the tooling shaft (2) passes through the connecting member (105) in the center hole (112) of the impeller seat, and then enters the impeller center hole (111) from the bottom of the impeller (110).

2. The pump head assembly method according to claim 1, characterized in that: The width of the connecting rod accommodating groove (201) is greater than the width or diameter of the connecting rod (1052), and the diameter of the connecting head accommodating hole (202) is greater than the diameter of the connecting head (1051); The depth of the connecting rod accommodating groove (201) is greater than the thickness or diameter of the connecting rod (1052); the connecting head accommodating hole (202) is a blind hole with an open top; and the depth of the connecting head accommodating hole (202) is greater than the depth of the connecting rod accommodating groove (201); Or the depth of the connecting rod accommodating groove (201) is greater than the thickness or diameter of the connecting rod (1052), and the connector accommodating hole (202) is a through hole that passes through the upper end and the lower end of the tooling shaft (2).

3. The pump head assembly method according to claim 2, characterized in that: The top of the connector receiving hole (202) is provided with a chamfer; the top of the connecting rod receiving groove (201) is provided with a chamfer.

4. The pump head assembly method according to claim 1, characterized in that: The pump casing pressing device comprises a base (306) and a pump casing pressing mechanism; a pump casing mounting groove (304) is provided on the top of the base (306); the pressing mechanism comprises a gland (301), a center rod (302) and a sleeve (303); a plurality of vertical rods (307) are provided on the base (306); the vertical rods (307) are vertically arranged, the lower ends of the vertical rods (307) are fixedly connected to the base (306) and are located outside the pump casing mounting groove (304), and the vertical rods (307) are spaced around the pump casing mounting groove (304); the upper ends of the vertical rods (307) pass through the gland (301), so that the gland (301) is movably sleeved on the vertical rods (307), so that the gland ( 301) can move up and down along the vertical rod (307); the center rod (302) is vertically arranged below the gland (301), and the upper end of the center rod (302) is fixedly connected to the gland (301); the sleeve (303) is vertically arranged below the gland (301), and the upper end of the sleeve (303) is fixedly connected to the gland (301); the sleeve (303) is sleeved outside the center rod (302); the inner diameter of the sleeve (303) is larger than the outer diameter of the liquid inlet pipe (101); the diameter of the center rod (302) matches the inner diameter of the inlet end of the liquid inlet pipe (101); the axis of the center rod (302) vertically passes through the bottom center of the pump casing mounting groove (304); When the lower housing (108) is located in the pump housing mounting groove (304) and the top cover (109) is placed on the lower housing (108), the pressure cover (301) is moved downward, so that the lower end of the center rod (302) on the pressure cover (301) is inserted into the liquid inlet pipe (101), so that the lower end of the sleeve (303) is sleeved outside the liquid inlet pipe (101), and the lower end of the sleeve (303) is pressed on the top cover (109) to press the top cover (109) onto the lower housing (108).

5. The pump head assembly method according to claim 4, characterized in that: The upper end of the center rod (302) is fixedly connected to the center of the gland (301), and the axis of the sleeve (303) coincides with the axis of the center rod (302).

6. The pump head assembly method according to claim 5, characterized in that: The pump casing installation groove (304) is opened at the top center of the base (306), and the pump casing installation groove (304) is a circular groove.

7. The pump head assembly method according to claim 6, characterized in that: An unloading hole (305) is provided at the center of the bottom of the housing installation groove, and the unloading hole (305) passes through the bottom of the pump housing installation groove (304).

8. The pump head assembly method according to claim 7, characterized in that: A pipe extension notch (308) is provided on one side of the pump casing mounting groove (304).

9. The pump head assembly method according to claim 8, characterized in that: There are at least two vertical poles (307).

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