Long-life slurry pump for easy installation

Abstract

The application provides a long-life slurry pump convenient to install, and belongs to the technical field of slurry equipment, and comprises a bracket, a driving assembly, a sheath, a cover body and a liquid inlet pipe. The rotating direction of an impeller is set as a first direction. The sheath is installed on the bracket and is sleeved on the outer side of the impeller; the outer end surface of the sheath is used for communicating with the liquid inlet pipe; a liquid outlet for discharging liquid is arranged on the sheath; a plurality of flow ports are arranged on the sheath in a circumferential direction and are penetrated, and the axis of the flow port is deflected to the first direction. The cover body is fixed on the outer side of the sheath, and the inner wall of the cover body and the outer wall of the sheath form a communication cavity in communication with the plurality of flow ports. The liquid inlet pipe is installed on the cover body and is in communication with the communication cavity and is used for inputting medium with a certain pressure into the communication cavity. The medium discharged from the flow port is in contact with the liquid disturbed by the impeller and is used for reducing the scouring of the sheath. The long-life slurry pump convenient to install provided by the application can not cause the problem that the sheath is continuously and rapidly scoured, so that the structure is simplified, and the service life of the slurry pump is ensured.

Description

Technical Field

[0001] This invention belongs to the field of slurry equipment technology, and more specifically, relates to a long-life slurry pump that is easy to install. Background Technology

[0002] A slurry pump is a machine that increases the energy of a liquid mixture through the rotation of an impeller, converting electrical energy into the kinetic and potential energy of the liquid. It is mainly used in industries such as mining, power plants, dredging, metallurgy, chemicals, building materials, and petroleum. Solid erosion wear is widespread in engineering fields such as metallurgy, environmental protection, chemicals, civil engineering, dredging, and agriculture, causing material loss in working parts, reduced mechanical efficiency, and shortened lifespan, resulting in significant production losses. Since the medium transported by slurry pumps is mainly a solid-liquid two-phase slurry with a high solid content, the material wear of its flow components is primarily due to the cumulative effect of the impact and damage to the component surfaces caused by solid particles with considerable hardness in the working medium. This damages the working components and seriously affects the normal operation of the slurry pump.

[0003] In the overall structure of a slurry pump, the liquid disturbed by the impeller rotation will directly scour the jacket. In order to ensure the service life and stability of the jacket, materials with high structural strength and wear resistance must be selected during design and installation. This increases the material purchase cost. More importantly, the jacket being scoured for a long time reduces the service life of the entire slurry pump. Summary of the Invention

[0004] The purpose of this invention is to provide an easy-to-install, long-life slurry pump, aiming to solve the problem that the lining is eroded over a long period of time, reducing the overall service life of the slurry pump.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a long-life slurry pump that is easy to install, comprising:

[0006] bracket;

[0007] A drive assembly is mounted on the bracket; the drive assembly includes a rotating shaft and an impeller mounted on the rotating shaft; the rotation direction of the impeller is set to a first direction;

[0008] A protective sleeve is installed on the bracket and is fitted over the outside of the impeller; the outer end face of the protective sleeve is used to connect to the liquid inlet pipe; the protective sleeve is provided with a liquid outlet for discharging liquid; multiple flow ports are opened through the circumference of the protective sleeve, and the axis of the flow ports is deflected in the first direction.

[0009] A cover is fixed to the outside of the sheath, and the inner wall of the cover and the outer wall of the sheath form a communicating cavity that communicates with the plurality of outlets;

[0010] An inlet pipe, installed on the cover and connected to the communicating cavity, is used to input a medium with a certain pressure into the communicating cavity;

[0011] The medium discharged from the outlet comes into contact with the liquid disturbed by the impeller to reduce erosion of the sheath.

[0012] In one possible implementation, the density of the orifice per unit area of ​​the sheath decreases along the first direction, and the angle between the axis of the orifice and the meridian of the sheath is an acute angle.

[0013] In one possible implementation, a flow-disrupting block is provided inside the flow port, the flow-disrupting block being located on the side of the flow port closer to the first direction, and the flow-disrupting block being used to adjust the direction of medium flow.

[0014] In one possible implementation, a nozzle is installed within the outlet, the nozzle being used to increase the pressure when the discharged medium is discharged.

[0015] In one possible implementation, the turbulence block is fixed to the corresponding nozzle.

[0016] In one possible implementation, the turbulence block extends from the nozzle into the inner cavity of the sheath.

[0017] In one possible implementation, the turbulence block is hinged to the inner wall of the inlet, the nozzle is slidably disposed within the inlet, and the nozzle compresses the turbulence block by means of the medium discharged through the inlet pipe to change the swing angle of the turbulence block.

[0018] In one possible implementation, the inlet pipe is hermetically connected to the cover and is used to inject liquid or gas into the communicating cavity.

[0019] In one possible implementation, the cover is detachably attached to the sheath.

[0020] In one possible implementation, a pressure pump is connected to the inlet pipe, and the pressure pump is connected to the inlet pipe via a branch pipe.

[0021] The beneficial effects of the easy-to-install, long-life slurry pump provided by this invention are as follows: Compared with the prior art, in this easy-to-install, long-life slurry pump, the drive assembly is first installed on a bracket, and a sheath is also installed on the bracket. The sheath is fitted over the outside of the impeller, and an inlet pipe is connected to the outer end face of the sheath. An outlet for discharging liquid is provided on the sheath. The impeller's rotation direction is set as a first direction. Multiple flow ports are provided through the sheath, arranged circumferentially along the sheath, and their axes are deflected towards the first direction. A cover is fixed to the outside of the sheath, and the inlet pipe is installed on the cover and communicates with the connecting cavity.

[0022] In practical applications, external liquid enters the casing through the inlet pipe and is eventually discharged from the outlet under the action of the impeller, etc. During impeller rotation, the inlet pipe injects medium into the connecting cavity, which is then discharged from multiple outlets. Because the outlets are deflected in the first direction, the discharged medium comes into contact with the liquid thrown off the impeller, causing the thrown liquid to change its direction of movement to the first direction. This application avoids the problem of continuous and high-speed scouring of the casing, thus simplifying the structure and ensuring the service life of the slurry pump. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a slurry pump when the impeller rotates in a first direction, as provided in an embodiment of the present invention.

[0025] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle;

[0026] Figure 3 This is a schematic diagram of the connection between the bracket and the sheath provided in an embodiment of the present invention.

[0027] In the diagram: 1. Sheath; 2. Cover; 3. Inlet pipe; 4. Connecting cavity; 5. Nozzle; 6. Baffle block; 7. Bracket; 8. Drive assembly; 801. Shaft; 802. Impeller; 9. Outlet; 10. Flow port. Detailed Implementation

[0028] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0029] Please refer to the following: Figures 1 to 3The present invention provides an easy-to-install, long-life slurry pump. The easy-to-install, long-life slurry pump includes: a bracket 7, a drive assembly 8, a sleeve 1, a cover 2, and an inlet pipe 3. The drive assembly 8 is mounted on the bracket 7; the drive assembly 8 includes a rotating shaft 801 and an impeller 802 mounted on the rotating shaft 801; the rotation direction of the impeller 802 is set as a first direction. The sleeve 1 is mounted on the bracket 7 and is fitted over the outside of the impeller 802; the outer end face of the sleeve 1 is used to connect to the inlet pipe 33; the sleeve 1 is provided with an outlet 9 for discharging liquid; multiple flow ports 10 are provided circumferentially along the sleeve 1, and the axis of the flow ports 10 is deflected in the first direction. The cover 2 is fixed to the outside of the sleeve 1, and the inner wall of the cover 2 and the outer wall of the sleeve 1 form a communicating cavity 4 communicating with the multiple flow ports 10. The inlet pipe 3 is mounted on the cover 2 and communicates with the communicating cavity 4 for inputting a medium with a certain pressure into the communicating cavity 4. The medium discharged from outlet 10 comes into contact with the liquid disturbed by impeller 802 to reduce scouring of sheath 1.

[0030] The beneficial effects of the easy-to-install long-life slurry pump provided by the present invention are as follows: Compared with the prior art, in the easy-to-install long-life slurry pump of the present invention, the drive assembly 8 is first installed on the bracket 7, and the sheath 1 is installed on the bracket 7. The sheath 1 is sleeved on the outside of the impeller 802, and the inlet pipe 33 is connected to the outer end face of the sheath 1. The sheath 1 is provided with an outlet 9 for discharging liquid. The rotation direction of the impeller 802 is set as the first direction. Multiple outlets 10 are provided through the sheath 1, and the multiple outlets 10 are arranged circumferentially along the sheath 1. At the same time, the axis of the outlets 10 is deflected towards the first direction. A cover 2 is fixed on the outside of the sheath 1, and the inlet pipe 3 is installed on the cover 2 and communicates with the connecting cavity 4.

[0031] In practical applications, external liquid enters the casing 1 through the inlet pipe 33 and is eventually discharged from the outlet 9 under the action of the impeller 802, etc. During the rotation of the impeller 802, the inlet pipe 3 injects medium into the connecting cavity 4, and the medium is finally discharged from multiple outlets 10. Because the outlets 10 are deflected in the first direction, the discharged medium will come into contact with the liquid thrown off the impeller 802, causing the thrown liquid to change its direction of movement to the first direction. This application avoids the problem of continuous and high-speed scouring of the casing 1, thus simplifying the structure and ensuring the service life of the slurry pump.

[0032] Currently, slurry pump casings mainly come in two forms: single-casing and double-casing. The double-casing structure consists of an outer shell and an inner shell. The outer shell is composed of two parts, front and rear, which are fitted together to form a cavity to accommodate the inner shell. The outer shell does not directly contact the working medium. The inner shell mainly consists of the slurry pump's flow-through components and comes into direct contact with the working liquid during operation. The impeller 802's rotation generates centrifugal force, thereby achieving liquid transport.

[0033] Therefore, studying the motion trajectory of solid particles, the impact velocity and impact angle of transported particles on the surface of flow parts in the solid-liquid two-phase flow field inside the slurry pump, and further exploring the wear law of solid-liquid slurry on the slurry pump, is of great significance for effectively reducing the wear of flow parts and extending the service life of the pump.

[0034] The above analysis shows that after the liquid is thrown out by the impeller 802, it moves towards the inner wall of the sleeve 1. At this time, the direction of liquid movement is towards the sleeve 1. When the liquid contacts the sleeve 1, some of its kinetic energy is lost under the action of the sleeve 1. As the liquid gradually flows in, it moves along the inner cavity of the sleeve 1 until it is discharged from the outlet 9. However, it can be seen from the above process that the liquid thrown out by the impeller 802 loses some of its kinetic energy after contacting the sleeve 1, which results in energy waste. More importantly, the thrown liquid moves at a high speed, which will scour the sleeve 1, thus placing requirements on the structural strength of the sleeve 1.

[0035] It should be noted that the impeller 802 itself has a certain thickness, which makes the liquid thrown out by the impeller 802 a cylindrical shape with a certain height. After considering the viscosity of the liquid and the specifications of the inlet 10, multiple inlets 10 can be appropriately opened on the inner wall of the sheath 1, that is, multiple inlets 10 are arranged at intervals along the thickness direction of the sheath 1. The inner diameter of the outer inlet 10 is smaller than the inner diameter of the middle inlet 10. The ultimate goal is to isolate the sheath 1 from the liquid thrown out by the impeller 802.

[0036] In this application, the medium discharged from the outlet 10 can prevent the liquid from directly impacting the sheath 1, thereby extending the service life of the sheath 1 and reducing the size of the sheath 1.

[0037] In some embodiments of the easy-to-install, long-life slurry pump provided in this application, please refer to... Figure 1 and Figure 2 The density of the outlet 10 per unit area of ​​the sheath 1 decreases along the first direction, and the angle between the axis of the outlet 10 and the meridian of the sheath 1 is an acute angle.

[0038] Under the action of centrifugal force, the liquid is thrown from the center of impeller 802 to the outer edge and gains energy, leaving the outer edge of impeller 802 at high speed and entering the volute sleeve 1. In the volute sleeve 1, the liquid slows down due to the gradual expansion of the flow channel, converting some of its kinetic energy into static pressure energy, and finally flows into the discharge pipe at a higher pressure, being delivered to the required location. When the liquid flows from the center of impeller 802 to the outer edge, a certain vacuum is formed at the center of impeller 802. Because the pressure above the liquid surface in the storage tank is greater than the pressure at the pump inlet, the liquid is continuously forced into impeller 802.

[0039] The main reason for the above situation is that the distance between the inner wall of the sheath 1 and the outer circumferential surface of the impeller 802 gradually changes, that is, the distance between the two gradually increases along the first direction. In actual application, since the kinetic energy of the liquid when it separates from the impeller 802 circumferentially is similar, but the distance between the sheath 1 and the impeller 802 varies, the closer the sheath 1 is to the impeller 802, the smaller the distance the liquid can move between the two, and the less it is disturbed by the surrounding liquid, and the less its kinetic energy drops before contacting the sheath 1. Therefore, the closer the distance between the sheath 1 and the impeller 802, the more the density of the outlet 10 needs to be increased, because the increased density of the outlet 10 results in a larger amount of medium discharged per unit time, which can effectively prevent the liquid from impacting the sheath 1.

[0040] In some embodiments of the easy-to-install, long-life slurry pump provided in this application, please refer to... Figure 1 and Figure 2 The outlet 10 is provided with a flow turbulence block 6, which is located on the side of the outlet 10 closer to the first direction. The flow turbulence block 6 is used to adjust the direction of medium flow.

[0041] The kinetic energy of the liquid increases accordingly under the disturbance of the impeller 802. In order to avoid the liquid impacting the jacket 1, it is necessary to ensure that the medium discharged from the outlet 10 also has a certain flow velocity and pressure. For this purpose, the multiple outlets 10 opened along the circumference of the jacket 1 in this application are all arranged facing the first direction. With the above arrangement, a medium flow with a certain flow velocity can be formed on the inner wall of the jacket 1, and the medium flow flows along the first direction.

[0042] However, it should be noted that some outlets 10 may be set directly facing other outlets 10, which will cause the medium just discharged from the outlet 10 to be impacted by the medium discharged from other outlets 10, which will eventually lead to the medium flow not being smooth, and there may be a problem that the medium is discharged from one outlet 10 and flows into another outlet 10.

[0043] To solve the above problems, a flow-disrupting block 6 is provided inside the hole wall of the outlet 10. The flow-disrupting block 6 can prevent other media from directly impacting the outlet 10, so that the media can move along the first direction of the sheath 1, and to a certain extent, ensure the scouring of the sheath 1 by the media.

[0044] In some embodiments of the easy-to-install, long-life slurry pump provided in this application, please refer to... Figure 1 and Figure 2 A nozzle 5 is installed inside the outlet 10. The nozzle 5 is used to increase the pressure when the medium is discharged.

[0045] The impeller 802 rotates at a high speed under the drive of the motor in the drive assembly 8. When the liquid comes into contact with the impeller 802, it gains kinetic energy, meaning the liquid moves outward in a radial pattern at a high speed. Traditionally, a protective sleeve 1 is installed on the outside to adjust the direction of liquid flow. In this application, multiple outlets 10 are provided. These outlets discharge a medium with a certain pressure, which comes into contact with the liquid, thus preventing it from contacting the protective sleeve 1.

[0046] Since the liquid has a large kinetic energy when it is thrown out, the medium discharged from the outlet 10 needs to have a certain kinetic energy to avoid the liquid scouring the sheath 1. For the above reasons, a corresponding nozzle 5 is installed in the outlet 10 in this application. The nozzle 5 will spray out a medium with a certain pressure. The medium will come into contact with the liquid thrown out by the impeller 802 and gradually change the direction of the liquid's movement, eventually making it move in the first direction.

[0047] In some embodiments of the easy-to-install, long-life slurry pump provided in this application, please refer to... Figure 1 and Figure 2 The turbulence block 6 is fixed on the corresponding nozzle 5.

[0048] To increase the pressure of the medium as it exits from the outlet 10, a nozzle 5 can be installed inside the outlet 10. Furthermore, to prevent the medium from scouring the nozzle 5, a baffle 6 needs to be installed. However, if the baffle 6 is directly incorporated into the sheath 1, the manufacturing process becomes quite difficult.

[0049] To solve the above problems, a baffle block 6 is provided on each nozzle 5. The baffle block 6 is part of the nozzle 5. During the installation process, it is necessary to ensure that each baffle block 6 is located on the side of the outlet 10 closer to the first direction. Therefore, only the above setting can achieve the effect of changing the direction of medium flow.

[0050] In some embodiments of the easy-to-install, long-life slurry pump provided in this application, please refer to... Figure 1 and Figure 2 The baffle block 6 extends from the nozzle 5 into the inner cavity of the sheath 1. In this application, if the baffle block 6 is only set in the outlet 10, the medium sprayed from other outlets 10 will still wash the sheath 1. That is, although the impact of the liquid on the sheath 1 is avoided, the washing of the medium on the sheath 1 cannot be avoided, and the service life of the sheath 1 cannot be effectively improved.

[0051] In order to prevent the medium ejected from the nozzle 10 from washing away the sheath 1, the turbulence block 6 extends a certain distance from the nozzle 5 into the inner cavity of the sheath 1. With the above setting, the medium flowing along the sheath 1 can be disturbed to the inside of the sheath 1, thereby reducing the contact time between the medium and the sheath 1.

[0052] In this application, the medium discharged from the outlet 10 can, on the one hand, prevent the liquid from directly scouring the sheath 1, and on the other hand, change the flow direction of the liquid to achieve energy saving. In order to achieve the above technical effect, the outlet 10 is tilted at a certain angle along the first direction. With the above setting, it can be approximately regarded that the liquid discharged from the outlet 10 can move along the inner wall of the sheath 1 along the first direction.

[0053] To explain in more detail, the liquid thrown out by the impeller 802 will move towards the sheath 1, while the medium discharged from the outlet 10 will move towards the impeller 802. It should be noted that at this time, both the liquid and the medium have a component of movement in the first direction. It is for the reasons mentioned above that the medium will gradually change its direction of movement during the liquid flow until it is discharged from the outlet 9.

[0054] By setting the pressure of the medium discharged from the outlet 10, the liquid can be prevented from contacting the sheath 1 during movement.

[0055] In some embodiments of the easy-to-install, long-life slurry pump provided in this application, please refer to... Figure 1 and Figure 2 The turbulence block 6 is hinged to the inner wall of the outlet 10, and the nozzle 5 is slidably disposed inside the outlet 10. The nozzle 5 uses the medium discharged by the inlet pipe 3 to squeeze the turbulence block 6 to change the swing angle of the turbulence block 6.

[0056] The medium entering the connecting cavity 4 will eventually be ejected from the nozzle 5. However, the nozzle 5 itself has a certain volume, which causes the medium in the connecting cavity 4 to exert a force on the end of the nozzle 5 near the cover 2. This force causes the nozzle 5 to squeeze the baffle block 6. Since a torsion spring is provided between the baffle block 6 and the outlet 10, the baffle block 6 will swing towards the inner cavity of the sheath 1 when the nozzle 5 squeezes it. The swing of the baffle block 6 will cause the medium flowing in the sheath 1 to move from the sheath 1 towards the center of the sheath 1. That is, the baffle block 6 changes the direction of movement of the flowing medium, making it even more difficult to effectively contact the sheath 1.

[0057] With the above settings, the liquid concentration and impeller speed can be adjusted. When the impeller speed is too fast and the liquid concentration is high, the pressure of the medium can be increased, thereby increasing the swing angle of the turbulence block 6. With the above settings, the medium and liquid cannot flush the sheath 1 for a long time, thereby achieving the purpose of protecting the sheath 1.

[0058] In some embodiments of the easy-to-install, long-life slurry pump provided in this application, please refer to... Figure 1 and Figure 2The inlet pipe 3 is sealed to the cover 2 and is used to inject liquid or gas into the connecting cavity 4. It should be noted that the type of medium needs to be selected appropriately depending on the concentration of the liquid being pumped and the rotational speed of the impeller 802. When the slurry pump needs to operate at low speed and the liquid mass is small, the liquid flow velocity within the sheath 1 is inherently low. In this case, gas with a certain pressure can be directly introduced into the inlet pipe 3. This gas changes the direction of liquid flow and prevents the liquid from scouring the sheath 1.

[0059] When the slurry pump needs to operate at high speed and the liquid density is relatively high, liquid medium can be introduced into the inlet pipe 3. At this time, the kinetic energy of the medium is large, which can better protect the sheath 1.

[0060] In some embodiments of the easy-to-install, long-life slurry pump provided in this application, please refer to... Figure 1 The cover 2 is detachably connected to the sleeve 1. To facilitate cleaning of the connecting cavity 4, the cover 2 can be connected to the outer wall of the sleeve 1 using multiple bolts. A sealing gasket is provided between the cover 2 and the sleeve 1 to prevent the medium from flowing out through the gap between them. During installation, the cover 2 can be positioned using multiple bolts.

[0061] In some embodiments of the easy-to-install long-life slurry pump provided in this application, a pressure pump is connected to the inlet pipe 3, and the pressure pump is connected to the inlet pipe 33 via a branch pipe. The inlet pipe 3 needs to inject medium into the connecting cavity 4, therefore a small pressure pump is required. This pressure pump is mainly used to increase the pressure of the medium, while ensuring a sufficient supply of medium in the connecting cavity 4. In practical applications, a branch pipe can be connected to the inlet pipe 33, and a pressure pump can be connected to the branch pipe. The pressure pump draws liquid from the inlet pipe 3, pressurizing it to enter the connecting cavity 4, thereby providing some protection for the sheath 1.

[0062] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A long-life slurry pump that is easy to install, characterized in that, include: bracket; A drive assembly is mounted on the bracket; the drive assembly includes a rotating shaft and an impeller mounted on the rotating shaft; the rotation direction of the impeller is set to a first direction; A protective sleeve is installed on the bracket and is fitted over the outside of the impeller; the outer end face of the protective sleeve is used to connect to the liquid inlet pipe; the protective sleeve is provided with a liquid outlet for discharging liquid; multiple flow ports are opened through the circumference of the protective sleeve, and the axis of the flow ports is deflected in the first direction. A cover is fixed to the outside of the sheath, and the inner wall of the cover and the outer wall of the sheath form a communicating cavity that communicates with the plurality of outlets; An inlet pipe, installed on the cover and connected to the communicating cavity, is used to input a medium with a certain pressure into the communicating cavity; The medium discharged from the outlet comes into contact with the liquid disturbed by the impeller to reduce the scouring of the sheath; The density of the flow outlet per unit area of ​​the sheath decreases along the first direction, and the angle between the axis of the flow outlet and the meridian of the sheath is an acute angle. The flow port is provided with a flow disturbance block, which is located on the side of the flow port closer to the first direction. The flow disturbance block is used to adjust the direction of medium flow.

2. The easy-to-install, long-life slurry pump as described in claim 1, characterized in that, A nozzle is installed inside the outlet, and the nozzle is used to increase the pressure when the medium is discharged.

3. The easy-to-install, long-life slurry pump as described in claim 2, characterized in that, The turbulence block is fixed to the corresponding nozzle.

4. The easy-to-install, long-life slurry pump as described in claim 3, characterized in that, The turbulence block extends from the nozzle into the inner cavity of the sheath.

5. The easy-to-install, long-life slurry pump as described in claim 4, characterized in that, The turbulence block is hinged to the inner wall of the inlet, and the nozzle is slidably disposed inside the inlet. The nozzle uses the medium discharged through the inlet pipe to squeeze the turbulence block to change the swing angle of the turbulence block.

6. The easy-to-install, long-life slurry pump as described in claim 1, characterized in that, The liquid inlet pipe is sealed to the cover and is used to inject liquid or gas into the communicating cavity.

7. The easy-to-install, long-life slurry pump as described in claim 1, characterized in that, The cover is detachably connected to the protective sleeve.

8. The easy-to-install, long-life slurry pump as described in claim 1, characterized in that, A pressure pump is connected to the inlet pipe, and the pressure pump is connected to the inlet pipe via a branch pipe.

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