Mounting set for a motor-driven centrifugal pump

Abstract

The invention relates to an assembly set (1) for a motor centrifugal pump, in particular a drinking and / or domestic water circulation pump, with a pipe connection element (4) comprising a housing block (400) with a first end (401) and a second end (402) and a check valve (43) mounted in the housing block (400), wherein the pipe connection element (40) comprises a drain valve (44) provided downstream of the check valve (43) between the first end (401) and the second end (402) in the direction of flow of the check valve (43).

Description

SCOPE OF APPLICATION AND STATE OF THE ART

[0001] The invention relates to a mounting kit for a motor centrifugal pump, in particular a drinking and / or domestic water circulation pump.

[0002] Motor-driven centrifugal pumps comprise a pump housing to be mounted in a pipeline and an electric motor attached to it.

[0003] For mounting the pump housing in the pipeline, it is known to screw a pipe connection element onto each inlet and outlet of the pump housing, to which a connecting pipe of the pipeline can be attached. Shut-off elements are usually provided in the pipe connection elements.

[0004] From DE29824911U1, a mounting kit for a centrifugal motor pump is known, comprising a pump housing with inlet and outlet, as well as pipe connecting elements permanently attached to the inlet and outlet, wherein a first pipe connecting element includes a shut-off device at the inlet nozzle and a second pipe connecting element includes a check valve at the outlet nozzle. A connecting pipe of a pipeline can be attached to each of the pipe connecting elements. TASK AND SOLUTION

[0005] It is an object of the invention to provide an improved mounting set for a motor centrifugal pump, in particular a drinking and / or domestic water circulation pump.

[0006] A mounting kit for a motor-driven centrifugal pump, in particular a drinking and / or process water circulation pump, is provided, comprising a pump housing and a pipe connection element that can be fluid-tightly connected to an outlet of the pump housing. The pipe connection element includes a housing block with a first end and a second end, a check valve mounted in the housing block, and a drain valve located downstream of the check valve between the first end and the second end.

[0007] The terms "a", "an", "a", etc. are used in the context of the application solely as indefinite articles and not as counters. Similarly, the terms "first", "second", etc. serve only to distinguish components and do not indicate any order or ranking. Furthermore, the use of the term "first" does not require the existence of a second or further element or component.

[0008] The drain valve allows the removal of residues and / or contaminants from a pipeline downstream of the check valve during reverse operation. Integrating the check valve and drain valve into a single pipe fitting simplifies installation and reduces the risk of incorrect assembly. In particular, it reduces the risk of installing the check valve and drain valve in the wrong order in the flow direction of the pipeline in which they are installed.

[0009] In some embodiments, the pump housing and the pipe connection element are separate components. In others, the components can be detachably and fluid-tightly connected. In some embodiments, the components can be supplied as a pre-assembled unit. In other embodiments, the pump housing and the pipe connection element are designed as an integral unit and / or are bonded together by a material interlock and thus permanently joined.

[0010] In some embodiments, the drain valve consists of a drain opening on the housing block and an actuating element adjustable within the drain opening, at least between a closed and an open position. In some embodiments, the actuating element is continuously adjustable between the closed and open positions. Depending on the embodiment, the actuating element can also be completely removed from the drain opening. In other embodiments, complete removal is prevented by a stop.

[0011] In one embodiment, the drain opening is provided on a channel section with an internal thread projecting from a pipe body of the housing block of the pipe connection element, wherein the adjusting element is designed as an adjusting screw which is screwed into the channel section. In some embodiments, the adjusting screw has a vent slot. The vent slot allows fluid to drain without the adjusting screw being completely removed from the channel section.

[0012] In one embodiment, a visually perceptible marking symbolizing the flow direction is provided on an outer surface of the housing block of the pipe connector. This marking serves as an aid for the correct alignment of the pipe connector during assembly and / or pre-assembly. Depending on the application, the marking can be selected using colors and / or symbols. In other embodiments, an arrow, at least visually, and preferably both visually and haptically perceptible, is provided as a marking, allowing for intuitive identification of the correct alignment of the pipe connector during assembly and / or pre-assembly.

[0013] In one embodiment, the pipe connection element further comprises a shut-off device, the shut-off device being mounted in the housing block downstream of the drain valve in the flow direction of the check valve. The shut-off device allows backflow towards the drain valve to be interrupted.

[0014] The shut-off device can be designed to suit the specific application.

[0015] In some designs, the shut-off device is a ball valve comprising a ball bearing mounted in the housing block between two bearing shells. Ball valves allow for reliable shut-off without leakage. They are also characterized by their high durability and quick and easy operation. In some designs, a wing nut is used as the actuating element of the ball valve, allowing for intuitive visual indication of the ball valve's position.

[0016] In some embodiments, a bearing for the ball valve includes a spring element, wherein a shoulder is provided in the housing block and the spring element forces the bearing shells with the ball plug arranged between them towards the shoulder. In some embodiments, an additional sealing ring is provided between the spring element and the bearing shell closer to the spring element. Alternatively or additionally, in some embodiments, a washer, in particular a brass washer, is arranged between the shoulder and the bearing shell closer to the shoulder.

[0017] In certain embodiments, at least one section of the outer surface of the housing block features a polygonal surface with at least two parallel surface segments, in particular a two-sided surface with exactly two parallel surface segments. The polygonal surface allows movement, in particular rotation, of the housing block about a central longitudinal axis by means of an externally applied tool, in particular a wrench, pipe wrench, or the like.

[0018] In some configurations, the assembly kit includes a first connector for linking the pipe connector to the outlet of the pump housing. The first connector and the pipe connector are components of a pipe connection system.

[0019] The pipe connecting element and the connecting piece are either materially bonded and thus inseparably connected in one design or designed as an integral component.

[0020] In other embodiments, the first end of the housing block of the pipe connection element is fluid-tight and detachably connected to the first connecting piece. This allows access to the elements integrated into the housing block for maintenance, repair, and / or replacement.

[0021] For a fluid-tight, detachable connection, in some designs an external thread is provided at the first end of the housing block of the pipe connection element for connection to the first connecting piece by means of a union nut.

[0022] Depending on the application, the connector is designed to connect the pipe fitting to the pump housing of the centrifugal pump. In some versions, an external thread is provided at the end of the first connector facing away from the pipe fitting, enabling a fluid-tight, detachable connection to the pump housing.

[0023] In some embodiments, the second end of the housing block of the pipe connector is designed to allow direct connection of the housing block to a pipeline. In other embodiments, a second connection piece is provided at the second end of the housing block of the pipe connector, wherein, in particular, the second connection piece can be detachably or permanently connected to a pipeline.

[0024] In certain embodiments, the second end of the housing block of the pipe connector is provided to the second connector in a fluid-tight, detachable manner. In particular, in these embodiments, the second end of the housing block of the pipe connector features an external thread for connection to the second connector by means of a union nut. In these embodiments, the first and second connectors are identical in design to reduce the number of parts. However, the invention is not limited to embodiments with identical first and second connectors.

[0025] Depending on the application, the mounting kit can be pre-assembled or provided in individual parts for mounting on a pipeline.

[0026] In some designs, the pipe connection system is materially bonded to the pump housing.

[0027] In a further training course, it is stipulated that the first connecting piece of the pipe connection system is fluid-tight and detachably connected to the outlet of the pump housing. The detachable connection allows for pre-assembly for simplified final assembly, while simultaneously enabling easy disassembly for maintenance and / or repair purposes.

[0028] In one embodiment, it is provided that the first connecting piece of the pipe connection system is connected to the outlet of the pump housing by means of a fluid-tight, detachable screw connection.

[0029] In particular, for a fluid-tight, detachable screw connection, the outlet of the pump housing has an internal thread and the first connecting piece has a complementary external thread.

[0030] In some designs, a thread sealing tape is provided between the internal thread and the external thread to ensure a secure seal.

[0031] Alternatively or additionally, in some designs, a shoulder for a sealing ring is provided at the base of the internal thread of the outlet. In these designs, a sealing ring is provided between the pump housing and the first connection piece to ensure a reliable seal. Depending on the application, this sealing ring may be a metal ring and / or a plastic ring, specifically, but not exclusively, polytetrafluoroethylene (PTFE), nitrile, neoprene, ethylene propylene diene monomer (EPDM) rubber, fluorocarbon, and / or silicone.

[0032] In some configurations, the assembly set also includes an inlet pipe connection element with a shut-off device, whereby, depending on the configuration, the inlet pipe connection element can be provided as a pre-assembled unit with the pump housing or separately.

[0033] In certain embodiments, it is particularly provided that a pre-assembled mounting set comprising a pump housing, a pipe connection system mounted at the outlet of the pump housing, and an inlet pipe connection system mounted at the inlet of the pump housing is supplied. However, the invention is not limited to this embodiment. In particular, it is conceivable to supply the mounting set only partially pre-assembled.

[0034] In some embodiments, the assembly set includes an insulating housing, which encloses the pump housing and the pipe connection element. In other embodiments, the insulating housing is designed to enclose the pump housing, the pipe connection element, and a connecting piece arranged between the pump housing and the pipe connection element. The insulating housing is specifically designed such that the drain valve and an actuating element for a shut-off device of the pipe connection element and / or a connection thread on a connection side of the pump housing are accessible when the housing is enclosed. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Further advantages and aspects of the invention become apparent not only from the claims but also from the following description of exemplary embodiments of the invention, which are explained with reference to the figures. These show: Fig. 1 in a sectional view a mounting set comprising a pump housing, a pipe connection system arranged at an outlet of the pump housing and an inlet pipe connection system arranged at an inlet of the pump housing; Fig. 2 in a perspective view the pipe connection system according to Fig. 1 comprising two connecting pieces and a pipe connecting element arranged between them; Fig. 3 in a perspective view the pipe connecting element according to Fig. 2 ; Fig. 4 in a first sectional view the pipe connection element according to Fig. 3 ; Fig. 5 the pipe connecting element according to Fig. 3 in a second sectional view. Fig. 6 shows a similar assembly set. Fig. 1comprising a pump housing, a pipe connection system arranged at an outlet of the pump housing, an inlet pipe connection system arranged at an inlet of the pump housing, and an insulating housing, Fig. 7 the assembly set according to Fig. 6 in a side view, and Fig. 8 the assembly set according to Fig. 6 in a front view. DETAILED DESCRIPTION OF THE EXECUTION EXAMPLES

[0036] Fig. 1 Figure 1 shows a mounting kit for a motor centrifugal pump (not shown), in particular a drinking and / or domestic water circulation pump.

[0037] The mounting kit 1 comprises a pump housing 2 with an inlet 20 and an outlet 21, as well as an inlet pipe connection system 3 arranged at the inlet 20 and an outlet pipe connection system 4, or simply pipe connection system 4, arranged at the outlet 21. Depending on the application, the inlet pipe connection system 3 and the pipe connection system 4, or the entire mounting kit 1, can be supplied as a pre-assembled unit and installed on-site in a pipeline (not shown). After mounting the mounting kit 1, a motor (not shown) of the centrifugal pump can be mounted on a connection side 22 of the pump housing 2, for example, by means of a union nut (also not shown).

[0038] The pipe connection system 4 arranged at the outlet 21 of the pump housing 2 comprises a pipe connection element 40, a first connecting piece 41 for connecting the pipe connection element 40 to the outlet 21 of the pump housing 2 and a second connecting piece 42 for connecting the pipe connection element 40 to a pipeline not shown.

[0039] The pipe connection system 4 is unique in Fig. 2 The pipe connector 40 is shown separately in the Figs. 3 to 5 shown in a perspective view and two cutaway views.

[0040] The in the Figures 1 to 5 The illustrated pipe connection element 40 comprises a housing block 400 and a check valve 43 mounted in the housing block 400 (see figure). Fig. 1 , 4 and 5 ), a drain valve 44 (see Fig. 2, 3 and 5 ) and a shut-off device 45 mounted in the housing block 400.

[0041] As in Fig. 1The shut-off device 45 is recognizable in the flow direction of the assembly set 1 (in Fig. 1 (from bottom to top) and thus arranged downstream of the check valve 43 in the flow direction. The in the Fig. 2, 3 and 5 The visible drain valve 44 is provided between the check valve 43 and the shut-off device 45.

[0042] As in Fig. 2 The direction of flow through the check valve 43, and thus the flow direction through the pipe connection element 40, is indicated during normal operation by a visually and, in the illustrated embodiment, also haptically perceptible marking 48 to prevent incorrect assembly. In the illustrated embodiment, the marking 48 is an arrow.

[0043] In the illustrated embodiment, the housing block 400 has a tube body that is at least substantially sleeve-shaped, with a first end 401 and a second end 402. The first end 401 faces the pump housing 2 during use.

[0044] The housing block 400 of the pipe connection system 4 is detachably connected to the connecting pieces 41 and 42 by means of a union nut 47, each in a fluid-tight manner. For this purpose, the housing block 400 has an external thread 408 at both its first end 401 and its second end 402. As shown in Fig. 1 In each embodiment, an intermediate disk 470 is provided between the housing block 400 and the connecting pieces 41, 42.

[0045] For handling with a tool during assembly, the housing block 400 has a polygonal surface on at least one outer surface, at least in sections. In the illustrated embodiment, the housing block 400 has a polygonal surface shaped as a two-sided edge with two parallel surface sections 409 (see figure). Figs. 2 and 3 ) on.

[0046] As in Fig. 1 , 4 and 5As can be seen, in the illustrated embodiment, the shut-off device 45 is designed as a ball valve comprising a ball plug 452 mounted in the housing block 400 between two bearing shells 450. The bearing shells 450 with the ball plug 452 mounted between them are forced towards a shoulder 403 in the housing block 400 by means of a spring element 454 and a sealing ring 456. A washer 46, in particular a brass washer, is provided between the shoulder 403 and the bearing shell 450 closer to the shoulder 403. A driver 458 for the ball plug 452 is guided through an opening 404 in the housing block 400. In the illustrated embodiment, a wing screw 459 is provided at one free end of the driver 458.

[0047] How best to Fig. 5As can be seen in the illustrated embodiment, the drain valve 44 is formed by a drain opening 405 on the housing block 400 provided between the first end 401 of the housing block 400 and the second end 402 of the housing block 400, and an adjustable actuating element 440 inserted in the drain opening 405.

[0048] In the illustrated embodiment, the drain opening 405 is provided on a channel section 406 projecting from the pipe body of the housing block 400, with an internal thread 4060. The adjusting element 440 is designed as an adjusting screw with a vent slot 441, which is screwed into the channel section 406.

[0049] By arranging the drain valve 44 and the shut-off device 45 together with the check valve 43 in a common pipe connection element 40, the risk of incorrect assembly, in particular the risk of assembly in an incorrect sequence of the drain valve 44, the shut-off device 45 and the check valve 43 in the direction of flow, can be prevented.

[0050] The pipe connecting element 40 is provided in at least one configuration as a pre-assembled unit with the two connecting pieces 41, 42 for assembly.

[0051] For pre-assembly of the pipe connection system 4 with the pump housing 2, the pipe connection element 40 is fluid-tightly connected by means of the first connector 41. The first connector 41 has an external thread 410 for connection to the pump housing 2. A complementary internal thread 210 is provided on the first outlet 21 of the pump housing 2. In the illustrated embodiment, a shoulder 211 for a sealing ring 23 is provided on the internal thread 210 of the pump housing 2 in order to ensure a fluid-tight connection during pre-assembly by means of the sealing ring.

[0052] The inlet 20 of the pump housing 2 is fluid-tightly connected to a connecting piece 32 of the inlet pipe connection system 3. In the illustrated embodiment, the connection of the inlet 20 of the pump housing 2 to the connecting piece 32 is designed at least substantially identically to the connection of the outlet 21 to the first connecting piece 41. Different designs are provided in other embodiments. In these embodiments, at least one assembly is permanently connected to the pump housing 2.

[0053] In the illustrated embodiment, the inlet pipe connection system 3 comprises an inlet pipe connection element 30 with a housing block 300 in which a shut-off device 31 is mounted, and two connecting pieces 32 which are detachably and fluid-tightly connected to the two ends of the housing block 300. The fluid-tight, detachable connection of the housing block 300 to the connecting pieces 32 is achieved by means of a union nut 33. In the illustrated embodiment, the shut-off device 31 of the inlet pipe connection element 30 is designed as a ball valve comprising a ball 312 mounted in the housing block 300 between two bearing shells 310. The bearing shells 310 with the ball 312 mounted between them are forced towards a shoulder 302 in the housing block 300 by means of a spring element 314 and a sealing ring 316. A driver 318 for the ball plug 312 is guided through an opening 303 of the housing block 300.

[0054] In the illustrated embodiment, the shut-off device 31 of the inlet pipe connection element 30 is at least substantially identical in design to the shut-off device 45 of the pipe connection element 40. This reduces the number of parts required in manufacturing. However, other designs are also conceivable.

[0055] Figs. 6 to 8 show a mounting set 1 for a motor centrifugal pump (not shown), in particular a drinking and / or domestic water circulation pump, similar to Fig. 1 .

[0056] The assembly set 1 according to Figs. 6 to 8 is similar to assembly set 1 according to Fig. 1 and for identical or similar components, matching reference numerals are used. The assembly set 1 also includes a pump housing 2 with an inlet 20 and an outlet 21, as well as an inlet pipe connection system 3 arranged at the inlet 20 and an outlet pipe connection system 4, or simply pipe connection system 4, arranged at the outlet 21. The in Figs. 6 to 8 The illustrated assembly set 1 further comprises an insulating housing 5. The illustrated insulating housing 5 encloses the pump housing 2 and the outlet pipe connection system 4. In some embodiments, the insulating housing also incorporates the inlet pipe connection system 3, as shown.

[0057] Depending on the application, the inlet pipe connection system 3 and the pipe connection system 4, or the entire mounting set 1, can be supplied as a pre-assembled unit and installed on-site in a pipeline (not shown). After mounting the mounting set 1, a motor (not shown) of the centrifugal pump can be mounted on a connection side 22 of the pump housing 2, for example, using a union nut (also not shown).

[0058] The pump housing 2, the inlet pipe connection system 3 and the outlet pipe connection system 4 are at least substantially identical in construction to the elements according to the Figs. 1 to 5designed and for a detailed description, please refer to the above.

[0059] The inlet pipe connection system 3 comprises in the Figs. 6 to 8 In the illustrated embodiment, an inlet pipe connection element 30 with a housing block 300 in which a shut-off device 31 is mounted, and a connecting piece 32 which is detachably connected to one end of the housing block 300 in a fluid-tight manner. A connecting piece is also arranged at the second end in use and / or in a pre-assembly.

[0060] The shut-off element 31 of the inlet pipe connection element 30 is designed as a ball valve comprising a ball plug 312 mounted in the housing block 300 between two bearing shells 310. The bearing shells 310 with the ball plug 312 mounted between them are forced towards a shoulder 302 in the housing block 300 by means of a spring element 314 and a sealing ring 316. A driver 318 for the ball plug 312 is guided through an opening 303 in the housing block 300. In contrast to the design according to Fig. 1 The inlet pipe connection element 30 is installed with a 180° rotated orientation. This orientation is irrelevant to its function and can be selected appropriately by a qualified professional depending on the application.

[0061] The pipe connection system 4 arranged on the outlet side comprises in the Figs. 6 to 8In the illustrated embodiment, a pipe connection element 40 with a housing block 400 in which a check valve 43, a drain valve 44 and a shut-off device 45 are mounted.

[0062] The pipe connection system 4 comprises a connecting piece 41 which is detachably connected to one end of the housing block 400 in a fluid-tight manner. At the second end, a connecting piece 42 is also used and / or pre-assembled (see figure). Fig. 1 ) arranged.

[0063] As in Figs. 7 and 8 As can be seen, the pump housing 2, the inlet pipe connection system 3, and the pipe connection system 4 are enclosed in the insulating housing 5. Wing nuts 319 and 459 for actuating the shut-off devices 31 and 45 are arranged on an outer surface of the insulating housing 5 and are accessible for actuation.

[0064] The insulating housing 5 also has an opening 50 through which the drain valve 44 is accessible. A connection element 54 for a drain hose (not shown) is provided on the insulating housing 5. The connection element 54 is detachably arranged on the insulating housing 5. For example, the connection element 54 is inserted into an opening in the insulating housing 5. As shown in Fig. 5As shown and described above, the drain valve 44 comprises a drain opening 405 provided on the housing block 400 and an adjustable actuating element 440 inserted in the drain opening 405. In certain embodiments, the actuating element 440 can be removed from the drain opening 405 and replaced by the connecting element 54. For example, the drain opening 405 has a channel section 406 with an internal thread 4060, wherein the actuating element 440 is designed as an adjusting screw that can be unscrewed from the channel section 406. The connecting element 54 has a thread complementary to the internal thread 4060, through which the connecting element 54 can be screwed into the drain opening 405.

[0065] The illustrated insulating housing 5 is in two parts and comprises two shells 51, 52 which can be placed around the pump housing 2, the inlet pipe connection system 3 and the pipe connection system 4.

[0066] The illustrated assembly sets 1 can each be provided as a fully or partially pre-assembled unit for installation in a pipeline, in order to facilitate assembly and prevent incorrect assembly.

[0067] In some configurations, an assembly set comprising the pump housing 2, the inlet pipe connection element 30, the pipe connection element 40 and the insulating housing 5 is provided as a pre-assembled unit.

[0068] As in Fig. 7 The direction of flow through the check valve 43, and thus the flow direction of the pipe connection element 40, is indicated on the insulating housing 5 by a visually and, in the illustrated embodiment, also haptically perceptible marking 53 to prevent incorrect assembly. In the illustrated embodiment, the marking 53 is an arrow.

[0069] As in Figs. 7 and 8As can be seen, the insulating housing 5 is further designed in such a way that a connection thread 222 to a connection side 22 of the pump housing 2 is accessible in an enclosed state.

[0070] In some embodiments, an assembly set comprising the pump housing 2, the inlet pipe connection element 30, and the pipe connection element 40 is provided as a pre-assembled unit, with an insulating housing 5 being placed around the unit after assembly. In other embodiments, the unit is used without the insulating housing.

Claims

1. Mounting set for a motor-driven centrifugal pump, in particular a drinking and / or service water circulation pump, comprising a pump housing (2) and a pipe connection element (4) that can be fluid-tightly connected to an outlet (21) of the pump housing (2), comprising a housing block (400) with a first end (401) and a second end (402) and a check valve (43) mounted in the housing block (400), characterized by the fact that the pipe connecting element (40) comprises a drain valve (44) provided in the flow direction of the check valve (43) downstream of the check valve (43) between the first end (401) and the second end (402).

2. Mounting kit according to claim 1, characterized by, the drain valve (44) is formed by a drain opening (405) on the housing block (400) and an actuating element (440) adjustable in the drain opening (405) at least between a closed position and an open position, wherein in particular the drain opening (405) is provided on a channel piece (406) projecting from a pipe body of the housing block (400) with an internal thread, wherein the actuating element (440) is designed as an actuating screw which is screwed into the channel piece (406), in particular as an actuating screw with a vent slot (441).

3. Mounting kit according to claim 1 or 2, characterized by the fact that A visually perceptible marking (48) symbolizing the direction of passage is provided on an outer surface of the housing block (400).

4. Mounting kit according to claim 1, 2 or 3, characterized by the fact thatthe pipe connecting element (40) comprises a shut-off device (45), wherein the shut-off device (45) is mounted in the housing block (400) in the flow direction of the check valve (43) downstream of the drain valve (44).

5. Mounting kit according to claim 4, characterized by the fact that The shut-off device (45) is designed as a ball valve comprising a ball plug (452) mounted in the housing block (400) between two bearing shells (450), wherein in particular a bearing for the ball valve comprises a spring element (454), wherein a shoulder (403) is provided in the housing block (400), and wherein the spring element (454) forces the bearing shells (450) with the ball plug (452) arranged between them in the direction of the shoulder (403), wherein in particular a washer (46), in particular a brass washer, is arranged between the shoulder (403) and the bearing shell (450) closer to the shoulder (403).

6. Mounting kit according to one of claims 1 to 5, characterized by the fact thatat least on one section of the outer surface of the housing block (400) a polygonal surface with at least two parallel surface sections (409), in particular a two-sided surface with exactly two parallel surface sections (409), is provided.

7. Assembly set according to one of claims 1 to 6, comprising a pipe connection system (4) comprising the pipe connection element (40) and a first connecting piece (41) for connecting the pipe connection element (40) to the outlet (21) of the pump housing (2).

8. Mounting kit according to claim 7, characterized by the fact that a first end (401) of the housing block (400) of the pipe connecting element (40) is fluid-tight and detachably connected to the first connecting piece (41), wherein in particular an external thread (408) is provided at the first end (401) of the housing block (400) of the pipe connecting element (40) for connection to the first connecting piece (41) by means of a union nut (47).

9. Mounting kit according to claim 7 or 8, characterized by the fact that An external thread (410) is provided at one end of the first connecting piece (41) facing away from the pipe connecting element (40) for a fluid-tight, detachable connection with a pump housing (2).

10. Mounting kit according to claim 7, 8 or 9, characterized by the fact that a second connection piece (42) is provided at a second end (402) of the housing block (400) of the pipe connection element (40), wherein in particular the second end (402) of the housing block (400) of the pipe connection element (40) is fluid-tight and detachably connected to the second connection piece (42), wherein in particular an external thread (408) is provided at the second end (402) of the housing block (400) of the pipe connection element (40) for connection to the second connection piece (42) by means of a union nut (47).

11. Mounting set according to one of claims 7 to 10, characterized by the fact thatthe first connecting piece (41) of the pipe connection system (4) is fluid-tight and detachably connected to the outlet (21) of the pump housing (2).

12. Mounting kit according to claim 11, characterized by the fact that the first connecting piece (41) of the pipe connection system (4) is connected to the outlet (21) of the pump housing (2) by means of a screw connection in a fluid-tight, detachable manner, wherein in particular the outlet (21) of the pump housing (2) has an internal thread (210) and the first connecting piece (41) has a complementary external thread (410).

13. Mounting kit according to claim 12, characterized by the fact that A shoulder (211) for a sealing ring (23) is provided at the base of the internal thread (210) of the outlet (21).

14. Mounting set according to one of claims 1 to 14, characterized by the fact that The assembly set (1) comprises an inlet pipe connection element (30) with a shut-off device (31).

15. Mounting set according to one of claims 1 to 14, characterized by the fact thatthe assembly set (1) comprises an insulating housing (5), wherein the insulating housing (5) encloses the pump housing (2) and the pipe connecting element (40).

Images