Efficient injection molding device for vehicle door protection plate

Abstract

The utility model discloses an efficient injection molding device for a vehicle door protection plate, which comprises an injection molding machine body, an injection molding extrusion mechanism is arranged on the injection molding machine body, an extrusion assembly is arranged on the injection molding extrusion mechanism, and a shell is arranged on the extrusion assembly. A first annular cover body, a second annular cover body and an electromagnetic heating coil are arranged on one side of the circumferential outer wall of the shell, a first heat conduction cavity is formed between the circumferential inner wall of the second annular cover body and the circumferential outer wall of the shell, and a preheating cavity is formed between the circumferential inner wall of the first annular cover body and the circumferential outer wall of the second annular cover body; and a feeding assembly is arranged at the top of the other side of the circumferential outer wall of the shell. According to the utility model, heat conduction oil can be heated by waste heat generated in the running process of equipment, and plastic raw materials in the feeding component are preheated by the heated heat conduction oil, so that the consumption of electric energy is reduced, the device is green and environment-friendly, and the injection molding efficiency and quality of the vehicle door protection plate are also improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to car door guard board injection equipment technical field, concretely is a kind of car door guard board high -efficient injection device. BACKGROUND

[0002] In modern automobile industry, car door guard board as the key component of automotive interior, not only bear the function of protecting the internal structure of car door, improve the comfort of ride, also have important influence to the beauty and texture of whole car, car door guard board needs to use injection device when producing.

[0003] Through the retrieval, patent announcement No.CN118342746A discloses an injection molding device for automobile lower guard plate, comprising: injection device, including shell, screw, driving mechanism, first heating layer, injection guide; first heating layer is fixed in the inner surface of shell, injection guide is fixed in the end of shell, screw is arranged inside shell, and screw can rotate along the center line of shell, screw includes first thread and second thread, the helix line pitch of second thread is greater than first thread, second heating layer is arranged in screw;Feeding device, including feed hopper and flat pressing mechanism, flat pressing mechanism includes cylinder and flat pressing plate, and first pressure sensor is fixedly arranged on the lower surface of flat pressing plate;Shaping device, including mold and ejector pin, second pressure sensor is arranged in mold;Control device is used to control injection process and filling material.This application improves the quality and consistency of finished product, solves the problems of uneven heating and unstable feeding in traditional injection device.

[0004] The existing car door guard board injection device needs to continuously heat the plastic raw materials at high temperature to reach the molten state when actually used, and the residual heat generated after heating is mostly directly dissipated through air cooling or water cooling system, a large amount of residual heat is not effectively recycled, causing energy waste, and in order to ensure the fluidity and plasticizing effect of plastic raw materials, the raw materials also need to be preheated to consume energy, which increases the consumption of energy, therefore, a car door guard board high-efficiency injection device is designed. UTILITY MODEL CONTENTS

[0005] In view of the defects or deficiencies of the car door guard board high-efficiency injection device, the utility model aims to provide a car door guard board high-efficiency injection device, which can heat the residual heat generated during equipment operation to the heat conducting oil, and preheat the plastic raw materials in the feeding assembly with the heated heat conducting oil, thereby reducing the consumption of electric energy and being green and environmentally friendly.

[0006] To achieve the above utility model purposes, the utility model adopts the following technical solutions:

[0007] The utility model provides a kind of high-efficiency injection molding device for door guard plate, including injection molding machine body, be provided with injection molding extrusion mechanism on the injection molding machine body, be provided with extrusion assembly on the injection molding extrusion mechanism, be provided with shell on the extrusion assembly, the side of the circumferential outer wall of shell is provided with first annular cover body, second annular cover body and electromagnetic heating coil, first heat-conducting cavity is arranged between the circumferential inner wall of second annular cover body and the circumferential outer wall of shell, preheating cavity is arranged between the circumferential inner wall of first annular cover body and the circumferential outer wall of second annular cover body, the top of other side of the circumferential outer wall of shell is provided with feeding assembly;

[0008] The outer wall of the feeding groove body is provided with a third annular cover body, and a second heat-conducting cavity is arranged between the inner wall of the third annular cover body and the outer wall of the feeding groove body. The feeding assembly is provided with a anti-blocking assembly for scattering the plastic raw materials inside the feeding groove body and an impeller assembly for rotating the anti-blocking assembly.

[0009] The injection molding extrusion mechanism is provided with a pump body for circulating the heat-conducting oil in the preheating cavity and the second heat-conducting cavity.

[0010] Preferably, the second annular cover body is located inside the first annular cover body, and the electromagnetic heating coil is located inside the second annular cover body. The circumferential outer wall of the second annular cover body is provided with heat-conducting fins arranged in a rectangular array. The preheating cavity is filled with heat-conducting oil.

[0011] Preferably, the shell is provided with a rotating shaft and a first spiral blade inside. The first spiral blade is arranged on the circumferential outer wall of the rotating shaft. One end of the rotating shaft extends to the outside through a sealing bearing at the center position of one end wall of the shell and is connected with a speed reducer motor through a shaft coupling. The speed reducer motor and the shell are arranged on the top side of the injection molding machine body.

[0012] Preferably, the inside of the feeding groove body is provided with a third connecting pipe. The bottom end of the third connecting pipe is provided with an anti-blocking assembly. The anti-blocking assembly is provided with a second rotating pipe. The circumferential inner wall of the second rotating pipe is connected with the lower part of the circumferential outer wall of the third connecting pipe through a sealing bearing. The circumferential outer wall of the second rotating pipe is provided with a scattering rod.

[0013] Preferably, a connecting shaft is installed at the center position of the bottom end of the second rotating pipe. The circumferential outer wall of the connecting shaft is provided with a second spiral blade. The second spiral blade is located inside the discharge end on the feeding groove body. The discharge end on the bottom end of the feeding groove body is arranged on one side of the top of the circumferential outer wall of the shell. The discharge end on the feeding groove body is connected with the inside of the shell.

[0014] Preferably, the impeller assembly is arranged inside the second rotating tube, an impeller body is arranged on the impeller assembly, the upper and lower circumferential outer walls of the impeller body are connected with the fourth connecting tube and the fifth connecting tube through sealing bearings respectively, the circumferential outer walls of the fourth connecting tube and the fifth connecting tube are connected with the circumferential inner wall of the first rotating tube through sealing bearings, the circumferential outer wall of the impeller body is connected with the circumferential inner wall of the first rotating tube through the first connecting rod, and the circumferential outer wall of the first rotating tube is connected with the circumferential inner wall of the second rotating tube through the second connecting rod.

[0015] Preferably, the bottom end of the fifth connecting tube is connected with the liquid outlet pipe through a pipe joint, the top end of the fourth connecting tube is connected with the first connecting tube through a pipe joint, the other end of the first connecting tube penetrates through the top end of the third connecting tube and extends to the outside, the upper circumferential outer wall of the third connecting tube is connected with the feeding tank body through the second connecting tube, and the two ends of the third connecting tube are connected with the inside of the third connecting tube and the second heat conducting cavity respectively.

[0016] Preferably, one side of the bottom of the circumferential outer wall of the first annular cover body is provided with a liquid outlet end, the liquid outlet end on the first annular cover body is connected with the liquid inlet end on the top of the circumferential outer wall of the first annular cover body through a conveying pipeline, the liquid outlet end of the pump body is connected with the first connecting tube through a conveying pipeline, and the lower end of the rear end of the outer wall of the third annular cover body is provided with a liquid outlet end, the liquid outlet end on the third annular cover body is connected with the liquid inlet end on one side of the top of the circumferential outer wall of the first annular cover body through a conveying pipeline.

[0017] Compared with the prior art, the above one or more technical solutions have the following beneficial effects:

[0018] 1. In the utility model, when the device is used for injection molding of the door guard plate, the electromagnetic heating coil on the injection molding extrusion mechanism heats the plastic raw materials in the shell, the temperature of the shell itself is also increased, the heat of the outer wall of the shell itself is transferred to the first annular cover body and the second annular cover body, the heat in the second annular cover body is exchanged with the heat conducting oil in the preheating cavity, the temperature of the heat conducting oil is increased, the pump body makes the heat conducting oil circulate in the preheating cavity and the second heat conducting cavity, and the heat conducting oil in the second heat conducting cavity transfers heat to the plastic raw materials in the feeding tank body through the feeding tank body, so that the plastic raw materials are preheated, the waste heat generated during the operation of the device is used to heat the heat conducting oil, the preheated heat conducting oil is used to preheat the plastic raw materials in the feeding assembly, the consumption of electric energy is reduced, and the device is green and environment-friendly.

[0019] 2、In the utility model, through the cooperation of a series of structures, when the pump body makes the heat conduction oil preheating cavity and the second heat conduction cavity circulate, the heat conduction oil flow drives the impeller assembly to rotate, the impeller assembly drives the anti-blocking assembly to rotate when rotating, the anti-blocking assembly can scatter the plastic raw materials in the feed groove body, avoids the caked plastic raw materials from blocking the discharge end of the feed groove body, avoids the caked plastic raw materials from affecting the injection molding quality of the door guard plate when extruding, the anti-blocking assembly drives the plastic raw materials in the feed groove body to be transported when rotating, further avoids the plastic raw materials from blocking the discharge end of the feed groove body, and improves the efficiency of the door guard plate injection molding. BRIEF DESCRIPTION OF DRAWINGS

[0020] The drawings accompanying the specification of this utility model form a part of the disclosure, serve to further provide an understanding of the utility model, and the illustrative embodiments of the utility model and the description thereof serve to explain the utility model, and do not constitute an improper limitation on the utility model.

[0021] Figure 1 It is the whole three-dimensional structure schematic diagram of the utility model.

[0022] Figure 2 It is the structure schematic diagram of the injection molding extrusion mechanism of the utility model Figure One .

[0023] Figure 3 It is the structure schematic diagram of the injection molding extrusion mechanism of the utility model Figure Two .

[0024] Figure 4 It is the sectional view of the connecting structure between the feed assembly and the extrusion assembly of the utility model.

[0025] Figure 5 It is the sectional view of the feed assembly of the utility model.

[0026] Figure 6 It is the structure schematic diagram of the anti-blocking assembly of the utility model.

[0027] Figure 7 It is the structure schematic diagram of the impeller assembly of the utility model.

[0028] In the drawing:

[0029] 100, injection molding machine body;

[0030] 200, injection molding extrusion mechanism;210, feed assembly;220, extrusion assembly;230, speed reducer motor;240, pump body;

[0031] 211. First connecting pipe; 212. Second connecting pipe; 213. Third connecting pipe; 214. Third annular cover; 215. Feed trough; 216. Impeller assembly; 217. Anti-clogging assembly;

[0032] 2161. Fourth connecting pipe; 2162. Impeller body; 2163. First rotating pipe; 2164. First connecting rod; 2165. Second connecting rod; 2166. Fifth connecting pipe; 2167. Liquid outlet pipe;

[0033] 2171. Second rotating tube; 2172. Connecting shaft; 2173. Second helical blade; 2174. Dispersing rod;

[0034] 221. Housing; 222. Rotating shaft; 223. First helical blade; 224. Electromagnetic heating coil; 225. First annular cover; 226. Second annular cover. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0036] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0037] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0038] like Figures 1-7 As shown, a high-efficiency injection molding device for car door panels includes an injection molding machine body 100, an injection molding extrusion mechanism 200 on the injection molding machine body 100, an extrusion assembly 220 on the injection molding extrusion mechanism 200, a housing 221 on the extrusion assembly 220, a first annular cover 225, a second annular cover 226 and an electromagnetic heating coil 224 on one side of the outer circumferential wall of the housing 221, the electromagnetic heating coil 224 heating the plastic raw material inside the housing 221 when energized, a first heat-conducting cavity between the inner circumferential wall of the second annular cover 226 and the outer circumferential wall of the housing 221, a preheating cavity between the inner circumferential wall of the first annular cover 225 and the outer circumferential wall of the second annular cover 226, and a feeding assembly 210 on the top of the other side of the outer circumferential wall of the housing 221;

[0039] The feeding assembly 210 is provided with a feeding groove 215, and a third annular cover 214 is arranged on the outer wall of the feeding groove 215, and a second heat-conducting cavity is arranged between the inner wall of the third annular cover 214 and the outer wall of the feeding groove 215. The feeding assembly 210 is provided with an anti-blocking assembly 217 for dispersing the plastic raw materials in the feeding groove 215 and an impeller assembly 216 for driving the anti-blocking assembly 217 to rotate.

[0040] The injection molding extrusion mechanism 200 is provided with a pump body 240 for circulating the heat-conducting oil in the preheating cavity and the second heat-conducting cavity.

[0041] The second annular cover 226 is located inside the first annular cover 225, and the electromagnetic heating coil 224 is located inside the second annular cover 226. The circumferential outer wall of the second annular cover 226 is provided with heat-conducting fins arranged in a rectangular array. The arrangement of the heat-conducting fins increases the heat exchange efficiency between the second annular cover 226 and the heat-conducting oil. The preheating cavity is filled with heat-conducting oil.

[0042] The inside of the shell 221 is provided with a rotating shaft 222 and a first spiral blade 223, and the first spiral blade 223 is arranged on the circumferential outer wall of the rotating shaft 222. One end of the rotating shaft 222 extends to the outside through a sealing bearing in the center of one end wall of the shell 221 and is connected to a speed reducer motor 230 through a shaft coupling. The speed reducer motor 230 and the shell 221 are arranged on the top side of the injection molding machine body 100. When the speed reducer motor 230 is started, it will drive the rotating shaft 222 to rotate. When the rotating shaft 222 rotates, it will drive the first spiral blade 223 to rotate. When the first spiral blade 223 rotates, it can extrude the plastic raw materials in the shell 221.

[0043] The inside of the feeding groove 215 is provided with a third connecting pipe 213, and the bottom end of the third connecting pipe 213 is provided with an anti-blocking assembly 217. The anti-blocking assembly 217 is provided with a second rotating pipe 2171. The upper part of the circumferential inner wall of the second rotating pipe 2171 is connected to the lower part of the circumferential outer wall of the third connecting pipe 213 through a sealing bearing. The circumferential outer wall of the second rotating pipe 2171 is provided with a dispersing rod 2174.

[0044] The bottom end center of the second rotating pipe 2171 is provided with a connecting shaft 2172, and the circumferential outer wall of the connecting shaft 2172 is provided with a second spiral blade 2173. The second spiral blade 2173 is located in the discharge end on the feeding groove 215. The discharge end on the bottom end of the feeding groove 215 is arranged on one side of the top of the circumferential outer wall of the shell 221. The discharge end on the feeding groove 215 is connected to the inside of the shell 221.

[0045] The impeller assembly 216 is arranged inside the second rotating pipe 2171, and an impeller body 2162 is arranged on the impeller assembly 216. The upper and lower parts of the circumferential outer wall of the impeller body 2162 are connected with the fourth connecting pipe 2161 and the fifth connecting pipe 2166 through sealing bearings respectively. The circumferential outer walls of the fourth connecting pipe 2161 and the fifth connecting pipe 2166 are connected with the circumferential inner wall of the first rotating pipe 2163 through sealing bearings. The circumferential outer wall of the impeller body 2162 is connected with the circumferential inner wall of the first rotating pipe 2163 through the first connecting rod 2164. The circumferential outer wall of the first rotating pipe 2163 is connected with the circumferential inner wall of the second rotating pipe 2171 through the second connecting rod 2165.

[0046] The bottom end of the fifth connecting pipe 2166 is connected with the liquid outlet pipe 2167 through a pipe joint. The top end of the fourth connecting pipe 2161 is connected with the first connecting pipe 211 through a pipe joint. The other end of the first connecting pipe 211 penetrates through the top end of the third connecting pipe 213 and extends to the outside. The upper part of the circumferential outer wall of the third connecting pipe 213 is connected with the feeding tank body 215 through the second connecting pipe 212. The two ends of the third connecting pipe 213 are respectively connected with the inside of the third connecting pipe 213 and the second heat-conducting cavity. When the heat-conducting oil flows from the fourth connecting pipe 2161 to the liquid outlet pipe 2167, the flow of the heat-conducting oil drives the impeller body 2162 to rotate. When the impeller body 2162 rotates, the first rotating pipe 2163 is driven to rotate through the first connecting rod 2164. When the first rotating pipe 2163 rotates, the second rotating pipe 2171 is driven to rotate through the second connecting rod 2165. When the second rotating pipe 2171 rotates, the dispersing rod 2174 and the second spiral blade 2173 are driven to rotate. When the dispersing rod 2174 rotates, the plastic raw materials inside the feeding tank body 215 are dispersed. When the second spiral blade 2173 rotates, the plastic raw materials inside the feeding tank body 215 are transported from the discharge end to the inside of the shell 221.

[0047] The bottom side of the circumferential outer wall of the first annular cover 225 is provided with a liquid outlet end. The liquid outlet end on the first annular cover 225 is connected with the liquid inlet end on the top side of the circumferential outer wall of the first annular cover 225 through a conveying pipeline. The liquid outlet end of the pump body 240 is connected with the first connecting pipe 211 through a conveying pipeline. The lower part of the rear end of the outer wall of the third annular cover 214 is provided with a liquid outlet end. The liquid outlet end on the third annular cover 214 is connected with the liquid inlet end on the top side of the circumferential outer wall of the first annular cover 225 through a conveying pipeline.

[0048] Working principle: in use, when the external power is turned on, when the device is used for injection molding of the vehicle door guard, the electromagnetic heating coil 224 on the injection extrusion mechanism 200 heats the plastic raw materials in the shell 221, the temperature of the shell 221 itself also rises, at this time, the heat of the outer wall of the shell 221 is transmitted to the first annular cover 225 and the second annular cover 226, the heat in the second annular cover 226 and the second annular cover 226 exchanges heat with the heat conducting oil in the preheating cavity, the temperature of the heat conducting oil rises, the pump body 240 makes the heat conducting oil circulate in the preheating cavity and the second heat conducting cavity, the heat conducting oil in the second heat conducting cavity transmits heat to the plastic raw materials in the feeding groove body 215 through the feeding groove body 215, realizes preheating of the plastic raw materials, so that the device can heat the heat conducting oil generated during operation, the heat conducting oil preheats the plastic raw materials in the feeding assembly 210, reduces the consumption of electric energy, is green and environment-friendly, when the pump body 240 makes the heat conducting oil circulate in the preheating cavity and the second heat conducting cavity, the heat conducting oil flows in the process of flowing and drives the impeller assembly 216 to rotate, the impeller assembly 216 rotates and drives the anti-blocking assembly 217 to rotate, the anti-blocking assembly 217 rotates and scatters the plastic raw materials in the feeding groove body 215, avoids that the caked plastic raw materials block the discharge end of the feeding groove body 215, also avoids that the caked plastic raw materials affect the injection molding quality of the vehicle door guard when extruding in the extrusion assembly 220, the anti-blocking assembly 217 rotates and conveys the plastic raw materials in the feeding groove body 215, further avoids that the plastic raw materials block the discharge end of the feeding groove body 215, improves the efficiency of the injection molding of the vehicle door guard.

[0049] The above only describes preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high-efficiency injection molding device for car door panels, comprising an injection molding machine body (100), characterized in that: The injection molding machine body (100) is provided with an injection molding extrusion mechanism (200), the injection molding extrusion mechanism (200) is provided with an extrusion assembly (220), the extrusion assembly (220) is provided with a shell (221), the circumferential outer wall of the shell (221) is provided with a first annular cover (225), a second annular cover (226) and an electromagnetic heating coil (224), the circumferential inner wall of the second annular cover (226) and the circumferential outer wall of the shell (221) are provided with a first heat conduction cavity, the circumferential inner wall of the first annular cover (225) and the circumferential outer wall of the second annular cover (226) are provided with a preheating cavity, and the top of the other side of the circumferential outer wall of the shell (221) is provided with a feeding assembly (210). The feeding assembly (210) is provided with a feeding groove (215), the outer wall of the feeding groove (215) is provided with a third annular cover (214), and the inner wall of the third annular cover (214) and the outer wall of the feeding groove (215) are provided with a second heat conduction cavity, the feeding assembly (210) is provided with an anti-blocking assembly (217) for dispersing plastic raw materials inside the feeding groove (215) and an impeller assembly (216) for driving the anti-blocking assembly (217) to rotate. The injection molding extrusion mechanism (200) is provided with a pump body (240) for circulating heat conduction oil in the preheating cavity and the second heat conduction cavity.

2. The high efficiency injection molding device for a door rock according to claim 1, wherein: The second annular cover (226) is located inside the first annular cover (225), and the electromagnetic heating coil (224) is located inside the second annular cover (226), the circumferential outer wall of the second annular cover (226) is provided with heat conduction fins arranged in a rectangular array, and the preheating cavity is filled with heat conduction oil.

3. The high efficiency injection molding device for a door rock according to claim 1, wherein: The inside of the shell (221) is provided with a rotating shaft (222) and a first spiral blade (223), and the first spiral blade (223) is arranged on the circumferential outer wall of the rotating shaft (222), one end of the rotating shaft (222) extends to the outside through a sealing bearing in the center position of one end wall of the shell (221) and is connected with a speed reducer motor (230) through a shaft coupling, and the speed reducer motor (230) and the shell (221) are arranged on the top side of the injection molding machine body (100).

4. The high efficiency injection molding device for a door rock according to claim 1, wherein: The inside of the feeding groove (215) is provided with a third connecting pipe (213), the bottom end of the third connecting pipe (213) is provided with an anti-blocking assembly (217), the anti-blocking assembly (217) is provided with a second rotating pipe (2171), the circumferential inner wall of the second rotating pipe (2171) is connected with the lower part of the circumferential outer wall of the third connecting pipe (213) through a sealing bearing, and the circumferential outer wall of the second rotating pipe (2171) is provided with a dispersing rod (2174).

5. The high efficiency injection molding device for a door rock according to claim 4, wherein: The bottom end of the second rotating pipe (2171) is provided with a connecting shaft (2172), and the circumferential outer wall of the connecting shaft (2172) is provided with a second spiral blade (2173), which is located in the discharge end on the feeding groove (215). The discharge end on the bottom end of the feeding groove (215) is arranged on one side of the top of the circumferential outer wall of the shell (221), and the discharge end on the feeding groove (215) is in communication with the inside of the shell (221).

6. The high efficiency injection molding apparatus for a door rock according to claim 1, wherein: The impeller assembly (216) is arranged in the second rotating pipe (2171), and the impeller assembly (216) is provided with an impeller body (2162). The upper and lower circumferential outer walls of the impeller body (2162) are connected with the fourth connecting pipe (2161) and the fifth connecting pipe (2166) through sealing bearings, respectively. The circumferential outer walls of the fourth connecting pipe (2161) and the fifth connecting pipe (2166) are connected with the circumferential inner wall of the first rotating pipe (2163) through sealing bearings. The circumferential outer wall of the impeller body (2162) is connected with the circumferential inner wall of the first rotating pipe (2163) through the first connecting rod (2164). The circumferential outer wall of the first rotating pipe (2163) is connected with the circumferential inner wall of the second rotating pipe (2171) through the second connecting rod (2165).

7. The high efficiency injection molding apparatus for a door rock according to claim 6, wherein: The bottom end of the fifth connecting pipe (2166) is connected with the liquid outlet pipe (2167) through a pipe joint. The top end of the fourth connecting pipe (2161) is connected with the first connecting pipe (211) through a pipe joint. The other end of the first connecting pipe (211) penetrates the top end of the third connecting pipe (213) and extends to the outside. The circumferential outer wall of the third connecting pipe (213) is connected with the feeding groove (215) through the second connecting pipe (212). The two ends of the third connecting pipe (213) are in communication with the inside of the third connecting pipe (213) and the second heat-conducting cavity, respectively.

8. The high efficiency injection molding apparatus for a door rock according to claim 1, wherein: The bottom end of the first annular cover (225) is provided with a liquid outlet, and the liquid outlet on the first annular cover (225) is connected with the liquid inlet of the pump body (240) through a conveying pipe. The liquid outlet of the pump body (240) is connected with the first connecting pipe (211) through a conveying pipe. The lower end of the rear end of the third annular cover (214) is provided with a liquid outlet. The liquid outlet on the third annular cover (214) is connected with the liquid inlet on the top of one side of the circumferential outer wall of the first annular cover (225) through a conveying pipe.

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