An experimental device for simulating the operation of a medium in a cryogenic pump

Abstract

The present invention discloses an experimental device for simulating the operation of a medium in a cryogenic pump, comprising a storage tank, a pump well pipe and a pump body, wherein the pump well pipe extends into the storage tank, and the pump body can be suspended in the pump well pipe; the tank body of the storage tank and the pump well pipe are transparent. The experimental device for simulating the operation of a medium in a cryogenic pump disclosed by the present invention can observe the operation state of the pump and the sealing condition of the bottom valve from the outside of the container, and can also observe the movement of the medium in the pump well pipe; through the long-term operation of the liquid medium, long-term observation can be carried out, and process simulation observation can be promoted and applied in the field of submersible pumps in cryogenic tanks.

Description

Technical Field

[0001] The invention relates to the technical field of cryogenic pumps, and in particular to an experimental device for simulating the operation of a medium in a cryogenic pump. Background Art

[0002] The submersible pump in the cryogenic tank operates at the lowest temperature of -196℃ and can transport LNG, LPG, LN2, etc., which are all low-temperature environments and contain certain dangerous media.

[0003] Unlike standard pumps, cryogenic tank submersible pumps are immersed in the medium, so they can only be tested with the medium and the test process cannot be observed. In actual use, cryogenic tank submersible pumps are installed in cryogenic storage tanks, and the operating status of the pump cannot be directly observed. Summary of the invention

[0004] The object of the present invention is to provide an experimental device for simulating the operation of a medium in a cryogenic pump, so as to solve the problem that the operation process of the medium in the cryogenic pump cannot be directly observed.

[0005] The invention provides an experimental device for simulating a medium running in a cryogenic pump, comprising a storage tank, a pump well pipe and a pump body, wherein the pump well pipe extends into the storage tank; the pump body can be suspended in the pump well pipe; the tank body of the storage tank and the pump well pipe are transparent.

[0006] Furthermore, the storage tank is a glass storage tank; and the pump well pipe is an acrylic pipe.

[0007] Furthermore, the storage tank is provided with a liquid inlet, and the pump well pipe is provided with a liquid outlet, and the liquid inlet and the liquid outlet are connected through a reflux channel to form a circulation loop; an air injection port is provided on the top plate; a valve plate is provided on the bottom surface of the bottom valve, and a suction section is provided at the bottom of the pump body, and a diversion channel is provided through the suction section. During the experiment, when the pump body descends to the bottom of the pump well pipe, the pump body is just stuck on the bottom valve, and the valve plate is opened, and the pump well pipe is connected with the storage tank through the diversion channel to form a communicating vessel, and the liquid medium flowing from the liquid inlet to the bottom of the storage tank flows into the pump well pipe through the bottom valve and the diversion channel; after the experiment, when the pump body is lifted up and leaves the bottom valve, the valve plate is closed, and the liquid medium is retained in the storage tank.

[0008] Furthermore, the pump body includes a DC motor, a motor housing is provided on the outside of the DC motor, a motor end cover is provided on the upper end of the motor housing, and a permanent magnet is fixed to the output shaft of the DC motor; a sealing plate is provided at the junction of the motor housing and the suction section, and the sealing plate is configured with a sealing gasket; a guide shell is provided at the top of the suction section, and the guide shell is provided with an impeller; a guide wheel is provided at the junction of the impeller chamber and the vertical guide part, and there is a gap between the guide wheels, and the fluid can flow from the vertical guide part into the impeller chamber through the guide wheel gap; wherein the impeller is made of non-metallic material, and a permanent magnet of opposite poles is wrapped in the impeller, and the permanent magnet interacts with the permanent magnet of opposite poles through the sealing plate.

[0009] Furthermore, the motor end cover, the motor housing and the suction section are provided with screw grooves from top to bottom, the screw grooves are provided with internal threads, and a screw is passed through the screw grooves to fasten the motor end cover, the motor housing and the suction section into one.

[0010] Furthermore, the diversion channel includes a vertical diversion part and a horizontal diversion part, wherein the vertical diversion part runs through the interior of the suction section and the upper end is connected to the diversion shell, and the horizontal diversion part is arranged on the side of the suction section and its two ends are respectively connected to the diversion shell and the pump well pipe.

[0011] Furthermore, the bottom valve comprises an upper valve body, a lower valve body, a spring assembly and a valve plate. The upper valve body and the lower valve body are fastened together by bolts. The valve plate is arranged on the bottom surface of the lower valve body. The valve plate is connected to the lower valve body through a number of spring assemblies.

[0012] Furthermore, the inner wall of the upper valve body is a conical surface, and the outer wall of the suction section is a conical surface;

[0013] When the pump body descends to the bottom of the pump well pipe, the outer wall of the suction section fits with the inner wall of the upper valve body; the bottom of the suction section falls into the valve plate, and the valve plate pulls down the spring assembly. After overcoming the elastic resistance of the spring assembly, the suction section and the conical surface of the upper valve body are matched to achieve sealing. At the same time, the valve plate is away from the lower valve body, the bottom valve is opened, and the pump well pipe is connected with the storage tank through the diversion channel to form a communicating vessel;

[0014] When the pump body is lifted away from the bottom valve, the elastic resistance of the spring assembly is released, the valve plate is pulled close to the lower valve body by the spring assembly, the bottom valve is closed, and the liquid medium is retained in the storage tank.

[0015] Furthermore, a needle tube piston is also provided on the top plate, a lifting rope is passed through the needle tube piston, a lifting ring is provided on the motor end cover of the pump body, and the bottom end of the lifting rope is tied to the lifting ring of the motor end cover; the lifting rope can control the lifting and lowering of the pump body in the pump well pipe.

[0016] Furthermore, a joint body is also provided on the top plate, a wire is passed through the joint body, the wire is connected to the pump body, and a cable connector is exposed on the wire.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention discloses an experimental device for simulating the operation of a medium in a cryogenic pump. A DC motor is placed in a liquid medium for operation. Since the pump well pipe is made of acrylic material and the storage tank is made of glass material, the operation status of the pump and the sealing condition of the bottom valve can be observed from the outside of the container, and the movement of the medium in the pump well pipe can be observed; the liquid inlet and the liquid outlet are connected through a reflux channel to form a circulation loop, so that the long-term operation of the liquid medium can be realized, and long-term observation can be performed. It can be promoted and applied in the field of submersible pumps in cryogenic tanks for process simulation observation. In addition, the experimental device for simulating the operation of a medium in a cryogenic pump disclosed by the present invention also has the following advantages:

[0019] 1. It can simulate and observe the operating status of the submersible pump in the cryogenic tank;

[0020] 2. It can simulate and observe the operating status of the bottom valve of the submersible pump in the cryogenic tank and the medium replacement process before the pump is disassembled;

[0021] 3. It can simulate and observe the NPSH test process and phenomenon of the submersible pump in the cryogenic tank;

[0022] 4. The pump flow rate can be adjusted and the liquid medium can be refluxed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the overall structure of the experimental device when the pump body descends to the bottom of the pump well pipe during the experiment provided in Example 1 of the present invention;

[0024] Figure 2 A schematic diagram of the structure of a pump body provided in Example 1 of the present invention;

[0025] Figure 3 A schematic diagram of the relationship between the pump body, the pump well pipe and the bottom valve when the pump body descends to the bottom of the pump well pipe during the experiment provided in Example 1 of the present invention;

[0026] Figure 4 A schematic diagram of the structure of the experimental device provided in Example 1 of the present invention when the pump body is lifted away from the bottom valve after the experiment is completed;

[0027] Figure 5 A schematic diagram of the relationship between the pump body, the pump well pipe and the bottom valve when the pump body descends to the bottom of the pump well pipe during the experiment provided in Example 1 of the present invention.

[0028] Description of reference numerals: 1-storage tank, 11-cover plate, 10-liquid inlet, 12-liquid outlet;

[0029] 2-pump well pipe, 20-liquid outlet, 21-bottom valve, 22-top plate, 23-needle piston, 24-hanging rope, 25-connector body, 26-conducting wire, 27-gas injection port;

[0030] 3- pump body, 31- DC motor, 32- motor housing, 33- motor end cover, 34- suction section, 340- guide shell, 35- permanent magnet, 36- sealing plate, 37- impeller, 38- screw;

[0031] 41-upper valve body, 42-lower valve body, 43-spring assembly, 44-valve plate;

[0032] 5- guide channel, 51- vertical guide part, 52- horizontal guide part, 53- guide wheel. DETAILED DESCRIPTION

[0033] The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0034] The present invention discloses an experimental device for simulating the operation of a medium in a cryogenic pump. A permanent magnet 35 is driven by a DC motor 31 to drive an impeller to rotate. A sealing plate 36 and a sealing gasket thereof are used to isolate and seal the motor in a motor housing 32, so that the DC motor can keep rotating during the flow of the medium. The pump well pipe 2 and the storage tank 1 are made of transparent acrylic and glass materials, respectively, to facilitate observation of the operation of the pump body 3 and the opening and closing of the bottom valve 21.

[0035] Example 1: An experimental device for simulating the operation of a medium in a cryogenic pump

[0036] Example 1 provides an experimental device for simulating the operation of a medium in a cryogenic pump, and its structure is described in detail below.

[0037] refer to Figure 1 and Figure 4 The experimental device for simulating the medium running in the cryogenic pump includes a storage tank 1, a pump well pipe 2 and a pump body 3.

[0038] The storage tank 1 is provided with a cover plate 11, and the pump well pipe 2 extends through the cover plate 11 into the storage tank 1, and the pump well pipe 2 is sealed and fixedly connected to the cover plate 11;

[0039] The bottom end and top end of the pump well pipe 2 are respectively provided with a bottom valve 21 and a top plate 22, and the pump body 3 can be suspended in the pump well pipe 2;

[0040] The cover plate 11 is provided with a liquid inlet 10, and the pump well pipe 2 above the cover plate 11 is provided with a liquid outlet 20, and the liquid inlet 10 and the liquid outlet 20 are connected through a reflux channel to form a circulation loop;

[0041] The tank body of the storage tank 1 and the tube body of the pump well pipe 2 are transparent;

[0042] A valve plate 44 is provided on the bottom surface of the bottom valve 21. During the experiment, when the pump body 3 descends to the bottom of the pump well pipe 2, the pump body 3 is just stuck on the bottom valve 21, and the opening and closing of the valve plate 44 are controlled by the deadweight of the pump body 3. At this time, the bottom valve 21 is opened to connect the pump body 3 with the storage tank 1; the liquid medium flowing from the liquid inlet 10 to the bottom of the storage tank 1 flows into the pump body 3 and the pump well pipe 2 successively through the bottom valve 21, and is discharged from the storage tank 1 through the liquid outlet 20; after the experiment, when the pump body 3 is lifted up and leaves the bottom valve 21, the bottom valve 21 is closed, and the experimental liquid is retained in the storage tank 1.

[0043] In order to achieve flow control of the reflux of the liquid medium, a valve is arranged in the reflux channel.

[0044] Furthermore, the entire storage tank 1 is transparent, and preferably, the storage tank 1 is a glass storage tank.

[0045] Furthermore, the entire pump well pipe 2 is transparent. Preferably, the pump well pipe 2 is made of acrylic material, which has good transparency and chemical stability.

[0046] refer to Figure 2 The pump body 3 includes a DC motor 31, a motor housing 32 is disposed outside the DC motor 31, a motor end cover 33 is disposed at the upper end of the motor housing 32, a suction section 34 is disposed at the bottom of the pump body 3, and a permanent magnet 35 is fixed to the output shaft of the DC motor 31;

[0047] A sealing plate 36 is provided at the junction of the motor housing 32 and the suction section 34, and the sealing plate 36 is provided with a sealing gasket;

[0048] A guide casing 340 is disposed at the top of the suction section 34 , and an impeller 37 is disposed inside the guide casing 340 .

[0049] Continue to refer Figure 2 A guide channel 5 is provided through the suction section 34, and the guide channel 5 includes a vertical guide portion 51 and a horizontal guide portion 52, wherein the vertical guide portion 51 runs through the interior of the suction section 34 and the upper end is connected to the guide shell 340, and the horizontal guide portion 52 is arranged on the side of the suction section 34 and its two ends are respectively connected to the guide shell 340 and the pump well pipe 2.

[0050] A guide wheel 53 is provided at the junction of the guide shell 340 and the vertical guide portion 51 . There is a gap between the guide wheels 53 , and the fluid can flow from the vertical guide portion 51 into the guide shell 340 through the gap between the guide wheels 53 .

[0051] The impeller 37 is made of non-metallic material, and is enclosed in the impeller 37 with permanent magnets of different polarities. The permanent magnet 35 interacts with the permanent magnets of different polarities through the sealing plate 36 .

[0052] Specifically, the motor end cover 33, the motor housing 32 and the suction section 34 are provided with screw grooves from top to bottom, and internal threads are provided in the screw grooves. A screw 38 is passed through the screw grooves to fasten the motor end cover 33, the housing 32 and the base 34 into one.

[0053] refer to Figure 3 The bottom valve 21 includes an upper valve body 41, a lower valve body 42, a spring assembly 43 and a valve plate 44. The upper valve body 41 and the lower valve body 42 are fastened together by bolts. The valve plate 44 is arranged on the bottom surface of the lower valve body 42. The valve plate 44 is connected to the lower valve body 42 by configuring a plurality of spring assemblies 43. Specifically, each group of spring assemblies 43 includes a return spring and a spring guide rod. The spring guide rod is a full-thread screw with a bolt head. The spring guide rod passes through the lower valve body 42 and the valve plate 44 from bottom to top. The return spring is sleeved on the outer side of the spring guide rod. The top end of the spring guide rod limits the return spring through a nut, so that the valve plate 44 is connected to the lower valve body 42 through the plurality of spring assemblies 43.

[0054] refer to Figure 3 The inner wall of the upper valve body 41 is conical, and the outer wall of the suction section 34 is conical.

[0055] When the pump body 3 descends to the bottom of the pump well pipe 2, the outer wall of the suction section 34 fits with the inner wall of the upper valve body 41; the bottom of the suction section 34 falls into the valve plate 44, and the valve plate 44 pulls down the spring assembly 43. After overcoming the elastic resistance of the spring assembly 43, the suction section 34 and the conical surface of the upper valve body 41 cooperate to achieve sealing. At the same time, the valve plate 44 moves away from the lower valve body 42, the bottom valve 21 opens, and the pump well pipe 2 is connected with the storage tank 1 through the diversion channel 5.

[0056] After the pump well pipe 2 is connected to the storage tank 1, the liquid levels of the pump well pipe 2 and the storage tank 1 are equal.

[0057] When the pump body 3 is lifted and leaves the bottom valve 21, the elastic resistance of the spring assembly 43 is released, the valve plate 44 is pulled close to the lower valve body 42 by the spring assembly 43, the bottom valve 21 is closed, and the liquid medium is retained in the storage tank 1. Figure 4 and Figure 5 As shown, at this time, the pump body 3 is in a suspended state in the pump well pipe 2, the bottom valve 21 is in a closed state, and the valve plate 44 is sealedly connected to the lower valve body 42.

[0058] A drain port 12 is provided at the bottom of the storage tank 1. At the end of the experiment, the drain port 12 is opened to drain the retained liquid.

[0059] A specific implementation method for achieving the lowering and lifting of the pump body 3 in the pump well pipe 2 is as follows: a needle piston 23 is further provided on the top plate 22, a hanging rope 24 is inserted into the needle piston 23, a hanging ring is provided on the motor end cover 33 of the pump body 3, and the bottom end of the hanging rope 24 is tied to the hanging ring of the motor end cover 33; the hanging rope 24 can control the lifting and lowering of the pump body 3 in the pump well pipe 2. When the hanging rope 24 controls the pump body 3 to descend to the bottom of the pump well pipe 2, the pump body 3 is just stuck on the bottom valve 21.

[0060] When the pump body 3 needs to be disassembled for maintenance, the needle piston 23 is pulled upward, and the suspension rope 24 lifts the pump body 3 to separate the pump body 3 from the bottom valve 21 .

[0061] In order to provide power to the pump body 3, a joint body 25 is further provided on the top plate 22. A wire 26 is passed through the joint body 25. The wire 26 is connected to the pump body 3. A cable connector is exposed outside the wire 26 for connecting the cable.

[0062] It is worth mentioning that in order to facilitate the experiment, the pump body can be reduced in proportion to the real machine according to the need to observe the DC motor working in liquid medium. In order to facilitate observation, the pump well pipe is also shortened.

[0063] Example 2: An experimental method for observing the operating state of liquid media with different flow rates flowing through a pump body

[0064] Embodiment 2 provides an experimental method for observing the running state of liquid media with different flow rates flowing through a pump body, using the experimental device provided in Embodiment 1 for simulating the running of a medium in a cryogenic pump, and the experimental method comprises the following steps:

[0065] Close the liquid discharge port 12, inject liquid medium into the liquid inlet 10, and the liquid medium gathers at the bottom of the storage tank 1 and overflows the bottom valve 21 until the liquid medium flows into the pump body 3 through the bottom valve 21;

[0066] The pump body 3 is started, and the wire 26 introduces current into the DC motor 31, and the DC motor 31 rotates to drive the permanent magnet 35 to rotate;

[0067] The permanent magnet 35 interacts with the permanent magnets of opposite poles in the impeller 37, driving the impeller 37 on the outer side of the sealing plate 36 to rotate. The rotation of the impeller 37 sucks the liquid medium from the inside of the storage tank 1 into the guide channel 5.

[0068] The liquid medium is sucked into the pump well pipe 2 through the diversion channel 5;

[0069] The liquid medium continues to gather until the liquid medium flows out from the liquid outlet 20;

[0070] The liquid medium flowing out of the liquid outlet 20 flows into the liquid inlet 10 through the reflux channel;

[0071] The valve on the reflux channel is controlled to adjust the pump flow rate, and the operating status of liquid media with different flow rates flowing through the pump body 3 is observed.

[0072] Example 3: An experimental method for simulating pump body disassembly and medium replacement

[0073] Embodiment 3 provides an experimental method for simulating pump body disassembly and medium replacement, using the experimental device for simulating medium running in a cryogenic pump provided in Embodiment 1, and the experimental method includes the following steps:

[0074] Turn off the power supply and the pump body 3 stops running;

[0075] The needle piston 23 is pulled upward, and the pump body 3 is lifted by the hanging rope 24. The spring assembly 43 pulls the valve plate 44 upward, and the valve plate 44 contacts the sealing member on the valve body bottom 20, so that the bottom valve 21 is sealed;

[0076] Lock the position of the needle piston 23, suspend the pump body 3 in the pump well pipe 2, and close the valve on the liquid outlet 20;

[0077] Use an air compressor to inject air into the air injection port 27, and the air is injected into the pump well pipe 2. The air pressure in the pump well pipe 2 increases, forcing the liquid medium to flow into the storage tank 1 again;

[0078] Continue to introduce air into the air injection port 27 to dry the pump well pipe 2;

[0079] Remove the top plate 22 from the pump well pipe 2;

[0080] The pump body 3 is lifted out.

[0081] Example 4: An experimental method for simulating the reinstallation of a submersible pump in a cryogenic tank

[0082] Example 4 provides an experimental method for simulating the reinstallation of a submersible pump in a cryogenic tank, using the experimental device for simulating the operation of a medium in a cryogenic pump provided in Example 1. The experimental method is the reverse process of the above-mentioned disassembly step, and includes the following steps:

[0083] Dry pump well pipe 2;

[0084] Press the needle piston 23 downward;

[0085] Lower the pump body 3 to the bottom valve 21 via the lifting rope 24, and make the suction section 34 contact the upper valve body 41;

[0086] The spring assembly 43 is controlled to balance the deadweight of the pump body 21 to control the opening of the valve plate 44 and to ensure that the valve plate 44 is at the opening and sealing effect required by the design;

[0087] Install the top plate 22;

[0088] When simulating the NPSH test of the pump, the drain port 12 is opened, the liquid level is controlled to drop, and the vibration and noise of the pump body 3 are observed.

[0089] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made on the basis of the present invention. Therefore, these modifications or improvements made on the basis of not departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. An experimental device for simulating the operation of a medium in a cryogenic pump, characterized in that: It comprises a storage tank (1), a pump well pipe (2) and a pump body (3), wherein the pump well pipe (2) extends into the storage tank (1), and the pump body (3) can be suspended in the pump well pipe (2), and the tank body of the storage tank (1) and the tube body of the pump well pipe (2) are transparent; The bottom end and top end of the pump well pipe (2) are respectively provided with a bottom valve (21) and a top plate (22); the bottom valve (21) comprises an upper valve body (41), a lower valve body (42), a spring assembly (43) and a valve plate (44); the upper valve body (41) and the lower valve body (42) are fastened together by bolts; the valve plate (44) is arranged on the bottom surface of the lower valve body (42); and the valve plate (44) is connected to the lower valve body (42) via a plurality of spring assemblies (43); The pump body (3) comprises a DC motor (31), a motor housing (32) is arranged outside the DC motor (31), a motor end cover (33) is arranged at the upper end of the motor housing (32), and a permanent magnet (35) is fixed to the output shaft of the DC motor (31); a suction section (34) is arranged at the bottom of the pump body (3), a sealing plate (36) is arranged at the junction of the motor housing (32) and the suction section (34), and the sealing plate (36) is equipped with a sealing gasket; a guide shell (340) is arranged at the top of the suction section (34), and an impeller (37) is arranged in the guide shell (340); wherein the impeller (37) is made of non-metallic material, and a permanent magnet of different polarity is enclosed in the impeller (37), and the permanent magnet (35) interacts with the permanent magnet of different polarity through the sealing plate (36); The inner wall of the upper valve body (41) is in the form of a cone, the outer wall of the suction section (34) is in the form of a cone, and the outer wall of the suction section (34) fits with the inner wall of the upper valve body (41); A flow guide channel (5) is provided through the suction section (34), and the flow guide channel (5) comprises a vertical flow guide portion (51) and a horizontal flow guide portion (52), wherein the vertical flow guide portion (51) passes through the interior of the suction section (34) and the upper end is communicated with the flow guide shell (340), and the horizontal flow guide portion (52) is provided on the side of the suction section (34) and the two ends thereof are respectively communicated with the flow guide shell (340) and the pump well pipe (2); a flow guide wheel (53) is provided at the junction of the flow guide shell (340) and the vertical flow guide portion (51), and a gap exists between the flow guide wheels (53), so that fluid can flow from the vertical flow guide portion (51) into the flow guide shell (340) through the gap of the flow guide wheel (53); The storage tank (1) is provided with a liquid inlet (10), and the pump well pipe (2) is provided with a liquid outlet (20). The liquid inlet (10) and the liquid outlet (20) are connected via a reflux channel to form a circulation loop, wherein the reflux channel is composed of the liquid inlet (10), the bottom valve (21), the vertical guide portion (51) and the horizontal guide portion (52) of the guide channel (5), the pump well pipe (2) and the liquid outlet (20), which are connected in sequence.

2. The experimental device according to claim 1, characterized in that: During the experiment, when the pump body (3) descends to the bottom of the pump well pipe (2), the pump body (3) is just stuck on the bottom valve (21), and the bottom of the suction section (34) falls into the valve plate (44). The valve plate (44) pulls down the spring assembly (43). After overcoming the elastic resistance of the spring assembly (43), the suction section (34) cooperates with the conical surface of the upper valve body (41) to achieve sealing. At the same time, the valve plate (44) moves away from the lower valve body (42), and the bottom valve (21) opens. The pump well pipe (2) is connected to the storage tank (1) through the diversion channel (5) to form a communicating vessel. The liquid medium that flows from the liquid inlet (10) to the bottom of the storage tank (1) flows into the pump well pipe (2) through the bottom valve (21) and the diversion channel (5). After the experiment, when the pump body (3) is lifted away from the bottom valve (21), the elastic resistance of the spring assembly (43) is released, the valve plate (44) is pulled close to the lower valve body (42) by the spring assembly (43), the bottom valve (21) is closed, and the liquid medium is retained in the storage tank (1).

3. The experimental device according to claim 1, characterized in that: The storage tank (1) is a glass storage tank; The pump well pipe (2) is made of acrylic material.

4. The experimental device according to claim 1, characterized in that: The top plate (22) is provided with a gas injection port (27).

5. The experimental device according to claim 1, characterized in that: The motor end cover (33), the motor housing (32) and the suction section (34) are provided with screw grooves from top to bottom, the screw grooves are provided with internal threads, and a screw (38) is inserted into the screw groove to fasten the motor end cover (33), the motor housing (32) and the suction section (34) into one body.

6. The experimental device according to claim 1, characterized in that: The top plate (22) is also provided with a needle tube piston (23), a hanging rope (24) is inserted into the needle tube piston (23), a hanging ring is provided on the motor end cover (33) of the pump body (3), and the bottom end of the hanging rope (24) is tied to the hanging ring of the motor end cover (33); The lifting rope (24) can control the lifting and lowering of the pump body (3) in the pump well pipe (2).

7. The experimental device according to claim 1, characterized in that: A joint body (25) is also provided on the top plate (22), a wire (26) is passed through the joint body (25), the wire (26) is connected to the pump body (3), and a cable connector is exposed outside the wire (26).

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