A kind of explosion-proof motor cavity static test device

Abstract

The utility model provides a kind of flameproof motor cavity static test device, the flameproof motor cavity static test device includes base, lower sealing plate, pressing plate, upper sealing plate and pressurizing mechanism.The utility model is in when static test to motor shell, first sealing installation upper sealing plate and lower sealing plate to the mouth portion of upper end cover and lower end cover, then motor shell is hoisted to the base, the lower end cover of motor shell is abutted on base, and the upper end cover of motor shell is pressed tightly using pressing plate, finally by pressurizing mechanism, liquid is delivered to the inside of motor shell and pressurization, the leakage condition of motor shell and the change of internal pressure are observed to judge whether the motor shell exists leakage condition.The application, by the setting of base and lower pressing plate, so that in static test process, upper end cover and lower end cover can play the role of support.Effective deformation of upper end cover and lower end cover can be reduced, and the size and position accuracy of mounting hole are guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of motor testing technology, specifically relating to an explosion-proof motor cavity static pressure testing device. Background Technology

[0002] Before installation, explosion-proof permanent magnet synchronous motors require a static pressure test on the motor housing to check its sealing performance. After welding, the weld seams and material defects are inspected to prevent leaks that could affect the motor's explosion-proof performance during later use. However, currently, during static load testing, the holes and mounting holes on the motor housing are sealed, rust inhibitor is added to the inside of the housing, and pressure is applied to check for leaks during liquid pressure testing to determine the housing's sealing performance. Because of the pressure inside the motor housing during testing, the motor end caps are prone to deformation after the test, affecting the dimensional and positional accuracy of the mounting holes on the end caps. Utility Model Content

[0003] This utility model provides an explosion-proof motor cavity static pressure test device, which aims to solve the problem in the prior art that the motor housing is prone to end cover deformation during static pressure testing, affecting the dimensional accuracy of the mounting holes on the end cover.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: to provide an explosion-proof motor cavity static pressure testing device, comprising: The base is used to support the motor housing on the lower end cover; A lower sealing plate is installed in a sealed manner at the opening of the lower end cover, and a liquid filling pipe for filling liquid into the motor housing is installed on the lower sealing plate; A pressure plate is located at the top of the motor housing and presses against the upper end cover of the motor housing; The upper sealing plate is sealed and installed at the opening of the upper end cover. The lower sealing plate is equipped with an exhaust pipe for venting the gas inside the motor housing. Both the liquid filling pipe and the exhaust pipe are equipped with control valves for controlling the flow status. The pressurizing mechanism has its outlet end connected to the liquid supply pipe, and is used to supply liquid to the liquid supply pipe and pressurize it.

[0005] In one possible implementation, a plurality of first support blocks are fixedly installed on the bottom of the pressure plate, and the plurality of first support blocks are used to support the connection between the upper end cover and the outer ring of the motor housing and the middle part of the upper end cover.

[0006] In one possible implementation, the upper sealing plate is mounted on the side of the upper end cover near the lower end cover, and the lower sealing plate is mounted on the side of the lower end cover near the upper end cover.

[0007] In one possible implementation, the lower sealing plate is detachably mounted on the opening of the lower end cap, and the liquid filling tube is detachably mounted on the lower sealing plate.

[0008] In one possible implementation, the upper sealing plate is detachably mounted on the opening of the upper end cover, and the exhaust pipe is detachably mounted on the upper end cover.

[0009] In one possible implementation, a gravity block is mounted on top of the pressure plate to increase its weight.

[0010] In one possible implementation, a plurality of reinforcing plates are fixedly installed on the top of the pressure plate, the length direction of the reinforcing plates is arranged along the radial direction of the pressure plate, and the plurality of reinforcing plates are evenly spaced along the circumference of the pressure plate, and the gravity block is installed on the reinforcing plates.

[0011] In one possible implementation, the top of the pressure plate is further fixedly fitted with a plurality of annular ribs of progressively larger size, the annular ribs passing through the plurality of reinforcing plates and being fixedly connected to the reinforcing plates.

[0012] In one possible implementation, the pressurization mechanism includes: Water tank; A pressure pump has its inlet end connected to the water tank, and its outlet end is connected to multiple distribution pipes, which are used to connect to the filling pipe.

[0013] The solution shown in this application, compared with the prior art, incorporates a base for placing the motor housing. During the static pressure test of the motor housing, the lower end cover of the motor housing can be placed on the base, and a pressure plate can be placed on the upper end cover of the motor housing to press the motor housing firmly onto the base. The design of the pressure plate and base provides support and fixation for the end covers at both ends of the motor housing. In this application, during the static pressure test of the motor housing, the upper and lower sealing plates are first sealed and installed at the openings of the upper and lower end covers. Then, the motor housing is hoisted onto the base, with the lower end cover of the motor housing abutting against the base. The pressure plate then presses the upper end cover of the motor housing firmly. Finally, the control valves on the filling and draining pipes are opened, and liquid is supplied to the inside of the motor housing through the pressurizing mechanism. After the liquid is filled, the control valve on the drain pipe is closed, and the pressurizing mechanism pressurizes the inside of the motor housing. After pressurization is complete, the control valve on the filling pipe is closed. The presence of leakage in the motor housing is determined by observing the leakage and changes in internal pressure. This application, through the arrangement of the base and the lower pressure plate, provides support for the upper and lower end covers during static pressure testing. This effectively reduces the deformation of the upper and lower end covers and ensures the dimensional and positional accuracy of the mounting holes. Attached Figure Description

[0014] Figure 1 A schematic diagram of the structure of the explosion-proof motor cavity static pressure testing device provided in this embodiment of the utility model; Figure 2 for Figure 1 Enlarged view of part A in the middle; Figure 3 for Figure 1 Enlarged view of part B in the middle; Figure 4 A schematic diagram of the structure of the pressure plate provided in an embodiment of this utility model; Figure 5 This is a schematic diagram of the pressurization mechanism provided in an embodiment of the present utility model.

[0015] Explanation of reference numerals in the attached figures: 1. Base; 2. Motor housing; 21. Lower end cover; 22. Upper end cover; 3. Lower sealing plate; 4. Upper sealing plate; 5. Pressure plate; 51. First support block; 52. Gravity block; 53. Reinforcing plate; 54. Circular rib; 6. Pressurization mechanism; 61. Water tank; 62. Pressurization pump; 63. Liquid separator. Detailed Implementation

[0016] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model 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 utility model and are not intended to limit the present utility model.

[0017] Please refer to the following: Figures 1 to 5 The explosion-proof motor cavity static pressure testing device provided by this utility model is described below. The explosion-proof motor cavity static pressure testing device includes a base 1, a lower sealing plate 3, a pressure plate 5, an upper sealing plate 4, and a pressurizing mechanism 6. The base 1 is used to support the lower end cover 21 of the motor housing 2; the lower sealing plate 3 is sealed and installed at the opening of the lower end cover 21, and a liquid filling pipe for filling liquid into the motor housing 2 is installed on the lower sealing plate 3; the pressure plate 5 is located at the top of the motor housing 2 and presses against the upper end cover 22 of the motor housing 2; the upper sealing plate 4 is sealed and installed at the opening of the upper end cover 22, and an exhaust pipe for venting gas from inside the motor housing 2 is installed on the lower sealing plate 3. Control valves for controlling the flow state are provided on both the liquid filling pipe and the exhaust pipe; the liquid outlet of the pressurizing mechanism 6 is connected to the liquid filling pipe for supplying liquid and pressurizing it.

[0018] The explosion-proof motor cavity static pressure testing device provided in this embodiment, compared with the prior art, features a base 1 for placing the motor housing 2. During the static pressure test of the motor housing 2, the lower end cover 21 of the motor housing 2 can be placed on the base 1, and a pressure plate 5 can be placed on the upper end cover 22 of the motor housing to press the motor housing 2 firmly onto the base 1. The design of the pressure plate 5 and the base 1 provides support and fixation for the end covers at both ends of the motor housing 2. In this application, during the static pressure test of the motor housing 2, the upper sealing plate 4 and the lower sealing plate 3 are first sealed and installed at the openings of the upper end cover 22 and the lower end cover 21. Then, the motor housing 2 is hoisted onto the base 1, with the lower end cover 21 of the motor housing 2 abutting against the base 1. The upper end cover 22 of the motor housing 2 is then pressed tightly by the pressure plate 5. Finally, the control valves on the liquid filling pipe and the liquid drain pipe are opened, and liquid is supplied to the inside of the motor housing 2 through the pressurizing mechanism 6. After the liquid is filled, the control valve on the exhaust pipe is closed, and the pressurizing mechanism 6 pressurizes the inside of the motor housing 2. After pressurization is completed, the control valve on the liquid filling pipe is closed. The leakage of the motor housing 2 and the change in internal pressure are observed to determine whether there is a leakage in the motor housing 2. In this application, the base 1 and the lower pressure plate 5 provide support for the upper end cover 22 and the lower end cover 21 during the static pressure test. This effectively reduces the deformation of the upper end cover 22 and the lower end cover 21, ensuring the size and positional accuracy of the mounting holes.

[0019] Specifically, in this embodiment, a pressure gauge for monitoring pressure is installed on the liquid filling pipe or the exhaust pipe.

[0020] Optionally, in this embodiment, when the pressure plate 5 is pressed against the top of the upper end cover 22 of the motor housing 2, it can be pressed by its own weight or by using an external pressure device to press the upper end cover 22 to prevent the upper end cover 22 and the lower end cover 21 from deforming during the test.

[0021] Preferably, in this embodiment, the wiring port of the motor housing 2 can be sealed in advance using a sealing plate. This is achieved by installing the sealing plate and sealing it with a sealing ring at the wiring port of the motor housing 2.

[0022] In some embodiments, the pressure plate 5 may be as follows: Figure 1 The structure shown. See also Figure 1Multiple first support blocks 51 are fixedly installed at the bottom of the pressure plate 5. These first support blocks 51 support the connection between the upper end cover 22 and the outer ring of the motor housing 2, as well as the middle of the upper end cover 22. The sides of the multiple first support blocks 51 away from the pressure plate 5 are located on the same plane. Furthermore, the corresponding support surfaces on the end cover are located on the same plane when in a free state. On one hand, the first support blocks 51 support the connection between the upper short rod and the side wall of the motor housing 2, thus providing a certain supporting force to the pressure plate 5 and ensuring the stability of the pressure plate 5's position. On the other hand, the first support blocks 51 also support the middle of the upper end cover 22, providing support to prevent deformation of the upper end cover 22.

[0023] Specifically, in this embodiment, the first support block 51 located outside the pressure plate 5 is arranged in a ring shape, similar to the side of the motor housing 2. This allows the multiple first support blocks 51 on the outer side to support the end of the motor housing 2, preventing deformation of the upper cover 22 under the weight of the pressure plate 5. Simultaneously, the first support block 51 located in the middle of the pressure plate 5 acts as a limit, not applying force to the upper cover 22. Instead, it limits the deformation of the upper cover 22 when it deforms upwards under the pressure from inside the motor housing 2, preventing deformation. Through the arrangement of the first support blocks 51, deformation of the upper cover 22 caused by the pressure plate 5 can be avoided, and deformation of the upper cover 22 can be limited.

[0024] Preferably, in this embodiment, a second support block is installed on the base 1, corresponding to the position of the first support block 51 on the pressure plate 5. The second support block is used to support the bottom of the lower end cover 21. When the motor housing 2 is installed on the base 1, the support of the second support block allows the motor housing 2 to be placed vertically on the base 1. At the same time, it ensures that the forces on each part of the lower end cover 21 on the motor housing 2 are balanced, reducing the deformation of the lower end cover 21.

[0025] In some embodiments, the upper sealing plate 4 and the lower sealing plate 3 can be adopted as follows: Figure 1 , Figure 2 and Figure 3 The structure shown. See also... Figure 1 , Figure 2 and Figure 3 The upper sealing plate 4 is installed on the side of the upper end cover 22 near the lower end cover 21, and the lower sealing plate 3 is installed on the side of the lower end cover 21 near the upper end cover 22. The upper sealing plate 4 and the lower sealing plate 3 are respectively installed on the inner side of the upper end cover 22 and the lower end cover 21. Therefore, when the internal pressure of the motor housing 2 increases, the compressive force between the upper sealing plate 4 and the upper end cover 22, and between the lower sealing plate 3 and the lower end cover 21 will increase, further increasing the sealing effect between the upper sealing plate 4 and the upper end cover 22, and between the lower sealing plate 3 and the lower end cover 21.

[0026] Specifically, compared to the case where the upper sealing plate 4 or lower sealing plate 3 is installed on the outside, when the internal pressure of the motor housing 2 increases, gaps are easily formed between the upper sealing plate 4 and the upper end cover 22, or between the lower sealing plate 3 and the lower end cover 21, resulting in a decrease in the internal pressure of the motor housing 2. In this embodiment, the installation method of the upper sealing plate 4 and the lower sealing plate 3 ensures that the greater the internal pressure of the motor housing 2, the better the sealing performance between the upper sealing plate 4 and the upper end cover 22, and between the lower sealing plate 3 and the lower end cover 21.

[0027] Preferably, in this embodiment, both the upper sealing plate 4 and the lower sealing plate 3 are bolted to the upper end cover 22 and the lower end cover 21, respectively. Both the upper sealing plate 4 and the lower sealing plate 3 have threaded holes, which are used to fix the upper sealing plate 4 and the lower sealing plate 3. Furthermore, sealing gaskets are provided between the upper sealing plate 4 and the upper end cover 22, and between the lower sealing plate 3 and the lower end cover 21, thereby improving the sealing effect between the upper sealing plate 4 and the upper end cover 22, and between the lower sealing plate 3 and the lower end cover 21.

[0028] In some embodiments, the lower sealing plate 3 described above can be as follows: Figure 1 , Figure 3 The structure shown. See also... Figure 1 , Figure 3 The lower sealing plate 3 is detachably installed at the opening of the lower end cover 21, and the liquid filling tube is detachably installed on the lower sealing plate 3. The lower sealing plate 3 is secured to the lower end cover 21 by bolts through the through hole on the lower end cover 21. The lower sealing plate 3 is also provided with a threaded hole for installing the liquid filling tube, and the end of the liquid filling tube is provided with a threaded part that is threaded to the threaded hole. Therefore, the liquid filling tube can be installed on the lower sealing plate 3 after the lower sealing plate 3 is installed on the lower end cover 21.

[0029] Preferably, in this embodiment, when installing the liquid filling pipe onto the lower sealing plate 3, PTFE tape can be wrapped around the threaded portion of the liquid filling pipe to improve the sealing performance between the liquid filling pipe and the lower sealing plate 3.

[0030] Specifically, in this embodiment, the lower end cover 21 is detachably mounted on the motor housing 2, and a sealing ring is provided between the lower end cover 21 and the motor housing 2. During the test, the lower sealing plate 3 can be installed onto the lower end cover 21 first, then the lower end cover 21 can be installed onto the motor housing 2, and finally the liquid filling pipe can be installed onto the lower sealing plate 3. This allows the lower sealing plate 3 to be reversed and placed inside the lower end cover 21.

[0031] In some embodiments, the upper sealing plate 4 described above can be as follows: Figure 1 , Figure 2 The structure shown. See also... Figure 1 , Figure 2The upper sealing plate 4 is detachably installed at the opening of the upper end cover 22, and the exhaust pipe is detachably installed on the upper end cover 22. The upper sealing plate 4 is secured to the upper end cover 22 by bolts through the through hole on the upper end cover 22. The upper sealing plate 4 is also provided with a threaded hole for installing the exhaust pipe, and the end of the exhaust pipe is provided with a threaded part that is threaded to the threaded hole. Therefore, the exhaust pipe can be installed on the upper sealing plate 4 after the upper sealing plate 4 is installed on the upper end cover 22.

[0032] Preferably, in this embodiment, when installing the exhaust pipe onto the upper sealing plate 4, PTFE tape can be wrapped around the threaded portion of the exhaust pipe to improve the sealing between the exhaust pipe and the upper sealing plate 4.

[0033] Specifically, in this embodiment, during the experiment, the upper sealing plate 4 and the lower sealing plate 3 can be installed onto the upper end cover 22 and the lower end cover 21 respectively in advance, and then the upper end cover 22 and the lower end cover 21 can be installed onto the motor housing 2. Then, the motor housing 2 is hoisted onto the base 1, and the liquid inlet pipe and the vent pipe are installed onto the lower end cover 21 and the upper end cover 22 respectively. Finally, the liquid inlet pipe is connected to the liquid outlet of the pressurizing mechanism 6 to add liquid and pressurize the inside of the motor housing 2.

[0034] Specifically, in this embodiment, both the upper end cover 22 and the lower end cover 21 can be detachably installed on the motor housing 2. During the testing of motor housing 2 of the same specification, only the motor housing 2 needs to be replaced for testing. The same upper end cover 22 and lower end cover 21 can be repeatedly disassembled and installed on the motor housing 2 to be tested, avoiding repeated disassembly and assembly between pipes. This facilitates static pressure testing of motor housing 2 of the same specification.

[0035] In some embodiments, the pressure plate 5 may be as follows: Figure 1 The structure shown. See also Figure 1 A gravity block 52 is installed on the top of the pressure plate 5 to increase its weight. The gravity blocks 52 are suspended from the pressure plate 5 and are evenly distributed across its top surface. Increasing the weight of the pressure plate 5 further prevents deformation of the upper end cover 22 and the lower end cover 21.

[0036] In some embodiments, the pressure plate 5 may be as follows: Figure 2 The structure shown. See also Figure 2Multiple reinforcing plates 53 are fixedly installed on the top of the pressure plate 5. The length direction of the reinforcing plates 53 is arranged radially along the pressure plate 5, and the multiple reinforcing plates 53 are evenly spaced along the circumference of the pressure plate 5. Gravity blocks 52 are installed on the reinforcing plates 53. The length direction of the reinforcing plates 53 is arranged radially along the pressure plate 5, and the width direction of the reinforcing plates 53 is arranged vertically. One side of the reinforcing plate 53 is fixedly installed on the top of the pressure plate 5, and the length direction of the reinforcing plate 53 is arranged radially along the pressure plate 5. This can improve the overall strength of the reinforcing plates 53 and prevent the upper end cover 22 from deforming due to deformation of the reinforcing plates 53.

[0037] In some embodiments, the pressure plate 5 may be as follows: Figure 1 , Figure 4 The structure is shown. See also the figure. Figure 1 , Figure 4 The top of the pressure plate 5 is also fixedly equipped with multiple annular ribs 54 of progressively larger size. The annular ribs 54 penetrate multiple reinforcing plates 53 and are fixedly connected to the reinforcing plates 53. The annular ribs 54 are set through multiple reinforcing plates 53 and are fixedly connected to the reinforcing plates 53 by welding. The annular ribs 54 can enhance the strength between multiple reinforcing plates 53, thereby further enhancing the stability of the pressure plate 5.

[0038] Specifically, in this embodiment, the design of the reinforcing plate 53 can prevent the pressure plate 5 from warping, while the design of the annular rib 54 can prevent the pressure plate 5 from twisting, thereby improving the stability of the pressure plate 5 in multiple directions.

[0039] In some embodiments, the pressurizing mechanism 6 described above may employ, for example... Figure 5 The structure shown. See also Figure 5 The pressurizing mechanism 6 includes a water tank 61 and a pressurizing pump 62. The inlet of the pressurizing pump 62 is connected to the water tank 61, and the outlet of the pressurizing pump 62 is connected to multiple distribution pipes 63, which are used to connect to the filling pipe. A water tank 61 is set up at the test site, and the pressurizing pump 62 is connected to the bottom of the water tank 61. The outlet of the vent pipe is located at the top of the water tank 61, so that the liquid can flow back into the water tank 61 after being discharged from the vent pipe.

[0040] Specifically, in this embodiment, multiple liquid distribution pipes 63 are connected to the liquid outlet end of the pressurizing pump 62. Each of the multiple liquid distribution pipes 63 is equipped with a valve for controlling the flow state. The multiple liquid distribution pipes 63 can be connected to the liquid supply pipes of multiple test stations. A single pressurizing pump 62 can be used to pressurize multiple test stations of the motor housing 2.

[0041] Preferably, in this embodiment, a water pump is also installed on one side of the pressurizing pump 62. The inlet end of the water pump is connected to the liquid filling pipe, and the outlet pipe is located at the top of the water tank 61. Furthermore, a valve is provided at the inlet end of the water pump. After the experiment is completed, the valve on the dispensing pipe 63 can be closed, and the valve at the inlet end of the water pump can be opened to pump the liquid inside the motor housing 2 back into the water tank 61.

[0042] Specifically, in this embodiment, during the test, the valve at the inlet of the water pump is closed, and the valve on the corresponding distribution pipe 63 of the pressure pump 62 is opened, as well as the control valves on the filling pipe and the vent pipe. The pressure pump 62 is then started to pump liquid into the motor housing 2. After the liquid flows back into the water tank 61 through the vent pipe, the motor housing 2 is full of liquid. The control valve on the vent pipe is then closed, and the pressure pump 62 continues to pump and pressurize. When the pressure reaches the set value, the pressure pump 62 and the control valve on the filling pipe are closed, and it is observed whether the motor housing 2 leaks liquid and whether the internal pressure changes. After the test is completed, the control valve on the filling pipe and the valve at the inlet of the water pump are opened, and the water pump is started to pump the liquid inside the motor housing 2 back into the water tank 61.

[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A static pressure testing device for an explosion-proof motor cavity, characterized in that, include: The base (1) is used to support the lower end cover (21) of the motor housing (2); The lower sealing plate (3) is sealed and installed at the opening of the lower end cover (21), and a liquid filling pipe for filling liquid into the motor housing (2) is installed on the lower sealing plate (3); The pressure plate (5) is located on the top of the motor housing (2) and presses against the upper end cover (22) of the motor housing (2); The upper sealing plate (4) is sealed and installed at the opening of the upper end cover (22). The lower sealing plate (3) is equipped with an exhaust pipe for discharging the gas inside the motor housing (2). The liquid filling pipe and the exhaust pipe are both equipped with control valves for controlling the flow state. The pressurizing mechanism (6) has its outlet end connected to the liquid supply pipe and is used to supply liquid to the liquid supply pipe and pressurize it.

2. The explosion-proof motor cavity static pressure testing device as described in claim 1, characterized in that, The bottom of the pressure plate (5) is fixedly equipped with a plurality of first support blocks (51), which are used to support the connection between the upper end cover (22) and the outer ring of the motor housing (2) and the middle part of the upper end cover (22).

3. The explosion-proof motor cavity static pressure testing device as described in claim 1, characterized in that, The upper sealing plate (4) is installed on the side of the upper end cover (22) near the lower end cover (21), and the lower sealing plate (3) is installed on the side of the lower end cover (21) near the upper end cover (22).

4. The explosion-proof motor cavity static pressure testing device as described in claim 3, characterized in that, The lower sealing plate (3) is detachably installed at the opening of the lower end cover (21), and the liquid filling tube is detachably installed on the lower sealing plate (3).

5. The explosion-proof motor cavity static pressure testing device as described in claim 3 or 4, characterized in that, The upper sealing plate (4) is detachably installed at the opening of the upper end cover (22), and the exhaust pipe is detachably installed on the upper end cover (22).

6. The explosion-proof motor cavity static pressure testing device as described in claim 1, characterized in that, The top of the pressure plate (5) is equipped with a gravity block (52) for increasing the weight of the pressure plate (5).

7. The explosion-proof motor cavity static pressure testing device as described in claim 6, characterized in that, Multiple reinforcing plates (53) are fixedly installed on the top of the pressure plate (5). The length direction of the reinforcing plates (53) is arranged along the radial direction of the pressure plate (5), and the multiple reinforcing plates (53) are evenly spaced along the circumference of the pressure plate (5). The gravity block (52) is installed on the reinforcing plate (53).

8. The explosion-proof motor cavity static pressure testing device as described in claim 7, characterized in that, The top of the pressure plate (5) is also fixedly installed with a plurality of annular ribs (54) whose size increases sequentially. The annular ribs (54) penetrate the plurality of reinforcing plates (53) and are fixedly connected to the reinforcing plates (53).

9. The explosion-proof motor cavity static pressure testing device as described in claim 1, characterized in that, The pressurization mechanism (6) includes: Water tank (61); The pressure pump (62) has its inlet end connected to the water tank (61), and the outlet end of the pressure pump (62) is connected to a plurality of distribution pipes (63), which are used to connect to the filling pipe.

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