Plunger pump

Abstract

The plunger pump comprises a pump body, the pump body is provided with a main liquid inlet, a water suction cavity, a liquid outlet flow path, a control flow path and a main liquid outlet which are sequentially communicated in series, and the main liquid outlet is communicated with the main liquid inlet through the water suction cavity; the liquid outlet flow path comprises a first flow path and a second flow path, and the first flow path and the second flow path are arranged in parallel; a first one-way valve is arranged in the first flow path, a control one-way valve is arranged in the control flow path, and the opening pressure of the control one-way valve is smaller than that of the first one-way valve. Liquid in the liquid outlet flow path can flow to the control flow path through any one or two of the first flow path and the second flow path at the same time, when low-pressure liquid outlet is needed, the low-pressure liquid does not need to pass through the first flow path and directly flows to the control flow path through the second flow path, and the control one-way valve is opened to flow to the main liquid outlet; the use effect of the low-pressure pump can be guaranteed, and the adjustable range of the liquid outlet pressure of the plunger pump is widened.

Description

Technical Field

[0001] This application relates to the field of plunger pump technology, and specifically to a plunger pump. Background Technology

[0002] In existing plunger pumps, there are two pump bodies connected in series: a low-pressure pump body and a high-pressure pump body, which are used to generate low-pressure liquid and high-pressure liquid, respectively. The low-pressure pump body is provided with a main inlet, and the high-pressure pump body is provided with a main outlet. The pump body with the main outlet on the high-pressure pump body is provided with a high-pressure suction chamber for pressurizing the liquid. The high-pressure pump body is also provided with an outlet channel for connecting the high-pressure suction chamber and the main outlet, so that the liquid can flow from the high-pressure suction chamber to the main outlet.

[0003] However, in such a plunger pump structure, since only an outlet channel is provided in the main outlet and the high-pressure suction chamber, both low-pressure and high-pressure liquids still need to flow out through the outlet channel. In most cases, a one-way valve is installed in the outlet channel to control the connection between the outlet channel and the high-pressure suction chamber. Therefore, in order to meet the high-pressure and low-pressure liquid output requirements at the same time, the opening threshold of this one-way valve is relatively high to ensure high-pressure liquid output. As a result, the low-pressure liquid output pressure value of the plunger pump in the prior art is relatively high, and the adjustable range of the liquid output pressure is relatively small, making it unsuitable for more scenarios.

[0004] Therefore, there is room for further improvement in the existing plunger pump technology. Utility Model Content

[0005] In view of this, and addressing the technical problem of the limited adjustable range of the discharge pressure of the plunger pump in the prior art, this application provides a plunger pump with a connected discharge flow path and a control flow path. The discharge flow path includes two parallel flow paths, one of which contains a check valve with a higher opening pressure, and the control flow path contains a check valve with a lower opening pressure. High-pressure water can open both check valves and flow out, while low-pressure water can open the check valve in the control flow path and flow out. This allows low-pressure water to flow directly into the control flow path without passing through the flow path with the high-opening check valve, enabling the plunger pump to open the low-opening-pressure check valve with only a small pressure, thus meeting the low-pressure discharge requirements and increasing the adjustable range of the plunger pump's discharge pressure.

[0006] This application provides a plunger pump, including a pump body, wherein the pump body is provided with a main liquid inlet, a suction chamber, a liquid outlet flow path, a control flow path and a main liquid outlet connected in series, and the main liquid outlet is connected to the main liquid inlet through the suction chamber;

[0007] The liquid outlet flow path includes a first flow path and a second flow path, wherein the first flow path and the second flow path are arranged in parallel;

[0008] The first flow path is provided with a first check valve, and the control flow path is provided with a control check valve. The opening pressure of the control check valve is less than the opening pressure of the first check valve.

[0009] Compared with the prior art, the plunger pump of this application has a series-connected outlet flow path and control flow path between the suction chamber and the main outlet. The outlet flow path includes a first flow path and a second flow path, which are connected in parallel. This means that the liquid in the outlet flow path can flow into the control flow path through either the first or second flow path, or both simultaneously. The first flow path is equipped with a first check valve, and the control flow path is equipped with a control check valve. The opening pressure of the first check valve is greater than the opening pressure of the control check valve. When high-pressure discharge is required, the high-pressure liquid can... Open the first check valve, and simultaneously flow from the first and second flow paths to the control flow path, then open the control check valve to flow to the main outlet. When low-pressure discharge is required, the low-pressure liquid does not need to pass through the first flow path, but flows directly through the second flow path to the control flow path, then opens the control check valve to flow to the main outlet. On the one hand, this ensures the effectiveness of the low-pressure pump and improves the adjustable range of the plunger pump's discharge pressure. On the other hand, since the second flow path and the first flow path are connected, it also avoids the problem of the low-pressure pump bursting due to excessive pressure, thus improving operational safety.

[0010] Preferably, the control flow path includes a control channel and a liquid outlet channel, wherein the control channel and the liquid outlet channel are connected in series.

[0011] The end of the liquid outlet channel away from the control channel is connected to the main liquid outlet, and the end of the control channel away from the liquid outlet channel is connected to the liquid outlet flow path.

[0012] The control check valve is located within the control channel and is used to control the connection between the liquid outlet flow path and the liquid outlet channel.

[0013] Preferably, the first flow path includes a first diversion channel and a second diversion channel, the second diversion channel is connected to the water absorption chamber through the first diversion channel, and the end of the second diversion channel away from the first diversion channel is connected to the control flow path;

[0014] The first one-way valve is installed in the first diversion channel and is used to control the connection between the water suction chamber and the second diversion channel.

[0015] Preferably, the second flow path includes a third diversion channel and a fourth diversion channel, the water absorption chamber is connected to the fourth diversion channel through the third diversion channel, and the end of the fourth diversion channel away from the third diversion channel is connected to the control flow path;

[0016] The end of the third diversion channel that is away from the fourth diversion channel is connected to the first diversion channel.

[0017] Preferably, the third diversion channel is provided with a first opening and a second opening, the first opening being connected to the water absorption chamber and the second opening being connected to the first diversion channel.

[0018] Preferably, the liquid outlet flow path further includes a buffer channel, which is connected to the main liquid outlet through the buffer channel;

[0019] The control channel and buffer channel are arranged parallel to the first direction at opposite ends of the liquid outlet channel, and the liquid outlet channel is arranged parallel to the second direction, with the first direction being perpendicular to the second direction;

[0020] Along the second direction, the buffer channel is located above the control channel.

[0021] Preferably, the second and third diversion channels are arranged parallel to the second direction at intervals, and the first and fourth diversion channels are arranged parallel to the third direction at intervals, with the second direction perpendicular to the third direction;

[0022] Along the second direction, the first diversion channel is located above the fourth diversion channel.

[0023] Preferably, the pump body is further provided with a liquid outlet chamber, and a liquid outlet valve is provided in the liquid outlet chamber. The liquid outlet valve is used to control the connection between the liquid outlet flow path and the control flow path.

[0024] Preferably, the pump body is further provided with a liquid collection chamber, which is used to collect the liquid in the suction chamber;

[0025] The water absorption chamber is connected to the second flow path through the liquid collection chamber.

[0026] Preferably, the pump body includes a first pump body and a second pump body, the first pump body and the second pump body are connected in series, the first pump body can output low-pressure liquid, and the second pump body can output high-pressure liquid;

[0027] The main liquid inlet is located on the first pump body;

[0028] The suction chamber, the liquid outlet, the control flow path, and the main liquid outlet are all located on the second pump body.

[0029] The plunger pump disclosed in this application has at least the following technical advantages:

[0030] 1. By setting the control flow path and the outlet flow path in series, and the outlet flow path includes two parallel flow paths, one of which is equipped with a high-pressure check valve, and the control flow path is equipped with a low-pressure check valve, the low-pressure liquid can flow directly to the control flow path without passing through the high-pressure check valve, thereby reducing the overall outlet pressure of the plunger pump, which can meet the lower low-pressure outlet demand, improve the overall outlet pressure adjustable range of the plunger pump, and make it applicable to more fields.

[0031] 2. By setting the buffer channel at the top of the outlet channel and control channel, the liquid will not easily flow out due to its own weight, thus ensuring precise control of the required outlet pressure.

[0032] 3. By setting a second opening in the third diversion channel to connect with the first diversion channel, when the pressure suddenly increases during low-pressure liquid discharge, the liquid can flow back and open the one-way valve in the first flow path, thereby achieving an explosion-proof effect.

[0033] 4. By setting an outlet valve to control the connection between the outlet flow path and the control flow path, liquid will only be discharged when there is liquid in the outlet chamber, thus ensuring the safety of the plunger pump. Attached Figure Description

[0034] Figure 1 This is a three-dimensional structural schematic diagram of a plunger pump provided in an embodiment of this application;

[0035] Figure 2 This is a partial cross-sectional schematic diagram of a plunger pump provided in an embodiment of this application;

[0036] Figure 3 This is a cross-sectional structural schematic diagram of a plunger pump provided in an embodiment of this application;

[0037] Figure 4 This is a three-dimensional cross-sectional structural diagram of a plunger pump provided in an embodiment of this application;

[0038] Figure 5 yes Figure 3 A magnified view of part A;

[0039] Figure 6 yes Figure 4 A magnified schematic diagram of part B.

[0040] Reference numerals: 1. First pump body; 2. Second pump body; 3. First motor; 4. Second motor;

[0041] 11. Main liquid inlet;

[0042] 21. Suction chamber; 22. First flow path; 23. Second flow path; 24. Control flow path; 25. Main outlet; 26. Collection chamber; 27. Outlet chamber; 28. Outlet valve;

[0043] 221. First diversion channel; 222. Second diversion channel; 223. First check valve;

[0044] 231. Third diversion channel; 232. Fourth diversion channel; 2311. First opening; 2312. Second opening;

[0045] 241. Control channel; 242. Discharge channel; 243. Buffer channel. Detailed Implementation

[0046] To enable those skilled in the art to better understand the technical solutions of this disclosure, the following detailed, clear, and complete description of this disclosure is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this disclosure and are not intended to limit it.

[0047] In the description of this application, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0048] Those skilled in the art should understand that in the disclosure of this application, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this application.

[0049] The present application will now be described in further detail with reference to the accompanying drawings, see below. Figures 1 to 6 illustrate.

[0050] This application provides a plunger pump for pressurizing and outputting liquids; such as Figure 1 As shown, it includes a pump body and a motor. The pump body has a main inlet 11, a suction chamber 21 and a main outlet 25. Atmospheric liquid enters the suction chamber 21 through the main inlet 11. The motor outputs power to control the liquid pressure in the suction chamber 21. Pressurized liquid flows out through the main outlet 25 to meet the liquid discharge requirements of different pressures.

[0051] In this application, such as Figure 1As shown, the pump body includes a first pump body 1 and a second pump body 2. The first pump body 1 is connected to a first motor 3, and the second pump body 2 is connected to a second motor 4. A total inlet 11 is located on the first pump body 1, and a total outlet 25 is located on the second pump body 2. Liquid flows in from the total inlet 11 of the first pump body 1, then flows into the second pump body 2, and flows from the total outlet 25 of the second pump body 2 to the outlet pipe. The first pump body 1 is a low-pressure pump used to output low-pressure liquid; the second pump body 2 is a high-pressure pump used to output high-pressure liquid.

[0052] Specifically, such as Figures 2 to 3 As shown, the second pump body 2 is provided with a liquid outlet flow path and a control flow path 24. The suction chamber 21, the liquid outlet flow path, and the control flow path 24 are connected in series. The suction chamber 21 is used to absorb the liquid flowing into the first pump body 1. The first pump body 1 can pressurize the liquid in the suction chamber 21 and output it to the liquid outlet flow path, and then enter the control flow path 24 and flow to the main liquid outlet 25. The liquid outlet flow path includes a first flow path 22 and a second flow path 23 arranged in parallel. That is, the liquid in the liquid outlet flow path can flow to the control flow path 24 through any one of the first flow path 22 and the second flow path 23 or both of them at the same time.

[0053] Among them, such as Figure 5 , Figure 6 As shown, a first check valve 223 is provided in the first flow path 22, and a control check valve is provided in the control flow path 24. The opening pressure of the first check valve 223 is greater than the opening pressure of the control check valve. When high-pressure liquid is required, the high-pressure liquid can open the first check valve 223 and flow from the first flow path 22 and the second flow path 23 to the control flow path 24. The high-pressure liquid can also open the control check valve to flow to the main outlet 25. When low-pressure liquid is required, the low-pressure liquid does not need to pass through the first flow path 22 and flows directly through the second flow path 24. 3. Flow direction control flow path 24 allows low-pressure liquid to open the control check valve and flow to the main outlet 25; thus, the outlet pressure of the plunger pump can be controlled at a lower level, giving the plunger pump a wider range of outlet pressure regulation and improving the application range of the plunger pump's outlet pressure; since the second flow path 23 is connected to the first flow path 22, when the pressure is too high during low-pressure use, it can flow back through the first flow path 22, thus avoiding the problem of the low-pressure pump bursting due to excessive pressure and improving the safety of use.

[0054] Furthermore, such as Figure 3 , Figure 4As shown, the second pump body 2 is provided with a liquid outlet chamber 27, which is located between the control oil circuit and the liquid outlet oil circuit. A liquid outlet valve 28 is provided in the liquid outlet chamber 27. The liquid outlet valve 28 is used to control the connection between the liquid outlet flow circuit and the control flow circuit 24. The liquid outlet valve 28 is connected to a sensor. The sensor can sense the liquid in the liquid outlet chamber 27 and thus transmit a signal to the liquid outlet valve 28. The liquid outlet valve 28 controls the connection between the liquid outlet oil circuit and the control oil circuit according to the information transmitted by the sensor, thereby improving the safety and precise control of the plunger pump.

[0055] Furthermore, such as Figures 1 to 4 As shown, the second pump body 2 is also provided with a liquid collection chamber 26, which is located above the water suction chamber 21. The liquid collection chamber 26 is connected to the water suction chamber 21 and is used to collect the liquid in the water suction chamber 21. The water suction chamber 21 is connected to the second flow path 23 through the liquid collection chamber 26, thereby realizing the export of the liquid in the liquid collection chamber 26.

[0056] Specifically, the liquid outlet flow path will be further described; such as Figures 2 to 6 As shown, the upper end of the second flow path 23 is connected to both the liquid collection chamber 26 and the first flow path 22, and the lower end of the second flow path 23 is connected to the liquid outlet chamber 27. The first flow path 22 includes a first diversion channel 221 and a second diversion channel 222. The second diversion channel 222 is connected to the liquid collection chamber 26 through the first diversion channel 221, and the end of the second diversion channel 222 away from the first diversion channel 221 is connected to the liquid outlet chamber 27.

[0057] Among them, such as Figure 6 As shown, the first one-way valve 223 is disposed in the first diversion channel 221. The first one-way valve 223 is used to control the connection between the water suction chamber 21 and the second diversion channel 222. When the liquid in the water suction chamber 21 flows into the first diversion channel 221 and has sufficient pressure, the liquid pushes the first one-way valve 223 to open the connection between the first separation channel and the second diversion channel 222. Conversely, when the liquid flows back from the second diversion channel 222 to the first diversion channel 221, the first one-way valve 223 cannot be opened, and the first diversion channel 221 and the second diversion channel 222 are not connected.

[0058] like Figure 6As shown, the second flow path 23 includes a third diversion channel 231 and a fourth diversion channel 232. The suction chamber 21 is connected to the fourth diversion channel 232 through the third diversion channel 231. That is, the upper end of the third diversion channel 231 is connected to the suction chamber 21, the lower end of the third diversion channel 231 is connected to the fourth diversion channel 232, and the end of the fourth diversion channel 232 away from the third diversion channel 231 is connected to the control flow path 24. This allows the liquid to enter the control flow path 24 from the suction chamber 21 through the third diversion channel 231 and the fourth diversion channel 232 without having to pass through the first flow path 22, and then flow out from the main outlet 25. Especially for low-pressure liquids, the control check valve in the control flow path 24 can be opened relatively easily to discharge the liquid, thereby making the overall discharge pressure of the plunger pump more adjustable.

[0059] Furthermore, such as Figure 2 , Figure 6 As shown, the third diversion channel 231 has a first opening 2311 and a second opening 2312 at one end near the water absorption chamber 21. The first opening 2311 is connected to the water absorption chamber 21, that is, the liquid in the water absorption chamber 21 can enter the third diversion channel 231 through the first opening 2311. The second opening 2312 is connected to the first diversion channel 221, and the liquid in the third diversion channel 231 can enter the first diversion channel 221 through the second opening 2312.

[0060] In this application, a first direction, a second direction, and a third direction are defined, wherein the first direction is perpendicular to the second direction, and the second direction is perpendicular to the third direction; for example Figure 4 As shown, the first direction is parallel to the X-axis, the second direction is parallel to the Y-axis, and the third direction is parallel to the Z-axis.

[0061] The second diversion channel 222 and the third diversion channel 231 are distributed along the Z-axis, and their axes are parallel to the second direction and spaced apart. The first diversion channel 221 and the fourth diversion channel 232 are distributed along the Y-axis and spaced apart, and their axes are parallel to the third direction and spaced apart. Specifically, the first flow path 22 is located on the side of the second flow path 23. In the Y-axis direction, the first diversion channel 221 is located above the second diversion channel 222, and the second diversion channel 222 is connected to the middle of the first diversion channel 221. The third diversion channel 231 is located above the fourth diversion channel 232, and the third diversion channel 231 is connected to the middle of the fourth diversion channel 232. In the second direction, the first diversion channel 221 is located above the fourth diversion channel 232, so that the low-pressure liquid can flow directly into the control flow path 24 without passing through the first flow path 22.

[0062] Specifically, the control flow path 24 will be further described; such as Figure 3 , Figure 5 As shown, the control flow path 24 includes a control channel 241 and a liquid outlet channel 242. The control channel 241 and the liquid outlet channel 242 are connected in series. The liquid outlet chamber 27 is connected to the liquid outlet channel 242 through the control channel 241. The control channel 241 is set parallel to the Z-axis direction, and the liquid outlet channel 242 is set parallel to the Y-axis direction. The bottom of the liquid outlet channel 242 is connected to the middle of the control channel 241. A control check valve is set in the control channel 241. The control check valve is used to control the connection between the liquid outlet flow path and the liquid outlet channel 242. When the liquid in the liquid outlet chamber 27 enters the control channel 241 along the X-axis direction and pushes the control check valve, the control channel 241 and the liquid outlet channel 242 are connected. The liquid can flow from the control channel 241 to the liquid outlet channel 242 and from the liquid outlet channel 242 to the main liquid outlet 25.

[0063] Among them, such as Figure 5 As shown, the liquid outlet flow path also includes a buffer channel 243. The buffer channel 243 is arranged parallel to the X-axis direction above the liquid outlet channel 242. The liquid outlet channel 242 is connected to the main liquid outlet 25 through the buffer channel 243, and the middle part of the buffer channel 243 is connected to the liquid outlet channel 242. The end of the buffer channel 243 near the pump body is connected to the main liquid outlet 25. The liquid enters the liquid outlet channel 242 from the control channel 241, and then enters the buffer channel 243 upward along the Y-axis direction. This can prevent the liquid from easily flowing out of the main liquid outlet 25 due to its own gravity, and can ensure relatively accurate liquid outlet control.

[0064] In this application, the first check valve 223 opens or closes along the Z-axis, and controls the check valve to open and close along the X-axis. This effectively prevents the liquid from easily opening the check valve due to its own gravity, improves the precise control of the output hydraulic pressure, avoids the probability of accidental opening, and improves the safety of the plunger pump.

[0065] It should be noted that the various embodiments of this application can be arbitrarily combined into new embodiments, provided that the solutions do not conflict and the technical solutions can coexist.

[0066] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The descriptions of the embodiments above are only for the purpose of helping to understand the present application and its core ideas. It should be noted that those skilled in the art can make several improvements and modifications to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A piston pump characterized in that, The pump body is provided with a total liquid inlet (11), a water suction cavity (21), a liquid outlet flow path, a control flow path (24) and a total liquid outlet (25) which are sequentially and serially communicated, and the total liquid outlet (25) is communicated with the total liquid inlet (11) through the water suction cavity (21); The liquid outlet flow path comprises a first flow path (22) and a second flow path (23), and the first flow path (22) and the second flow path (23) are arranged in parallel; The first flow path (22) is provided with a first one-way valve (223), and the control flow path (24) is provided with a control one-way valve, and the opening pressure of the control one-way valve is less than the opening pressure of the first one-way valve (223).

2. The plunger pump of claim 1, wherein The control flow path (24) comprises a control channel (241) and a liquid outlet channel (242), and the control channel (241) and the liquid outlet channel (242) are serially communicated; The end of the liquid outlet channel (242) away from the control channel (241) is communicated with the total liquid outlet (25), and the end of the control channel (241) away from the liquid outlet channel (242) is communicated with the liquid outlet flow path; The control one-way valve is arranged in the control channel (241), and the control one-way valve is used for controlling the communication between the liquid outlet flow path and the liquid outlet channel (242).

3. The plunger pump of claim 2, wherein The first flow path (22) comprises a first shunt channel (221) and a second shunt channel (222), the second shunt channel (222) is communicated with the water suction cavity (21) through the first shunt channel (221), and the end of the second shunt channel (222) away from the first shunt channel (221) is communicated with the control flow path (24); The first one-way valve (223) is arranged in the first shunt channel (221), and the first one-way valve (223) is used for controlling the communication between the water suction cavity (21) and the second shunt channel (222).

4. The plunger pump of claim 3, wherein The second flow path (23) comprises a third shunt channel (231) and a fourth shunt channel (232), the water suction cavity (21) is communicated with the fourth shunt channel (232) through the third shunt channel (231), and the end of the fourth shunt channel (232) away from the third shunt channel (231) is communicated with the control flow path (24); The end of the third shunt channel (231) away from the fourth shunt channel (232) is communicated with the first shunt channel (221).

5. The plunger pump of claim 4, wherein The third shunt channel (231) is provided with a first opening (2311) and a second opening (2312), the first opening (2311) is communicated with the water suction cavity (21), and the second opening (2312) is communicated with the first shunt channel (221).

6. The plunger pump of claim 2, wherein The liquid outlet flow path further comprises a buffer channel (243), and the liquid outlet channel (242) communicates with the total liquid outlet (25) through the buffer channel (243); The control channel (241) and the buffer channel (243) are arranged at opposite ends of the liquid outlet channel (242) in parallel to a first direction, and the liquid outlet channel (242) is arranged in parallel to a second direction, and the first direction is perpendicular to the second direction; Wherein, along the second direction, the buffer channel (243) is above the control channel (241).

7. The plunger pump of claim 4, wherein, The second shunt channel (222) and the third shunt channel (231) are arranged in parallel to a second direction, and the first shunt channel (221) and the fourth shunt channel (232) are arranged in parallel to a third direction, and the second direction is perpendicular to the third direction; Wherein, along the second direction, the first shunt channel (221) is above the fourth shunt channel (232).

8. The plunger pump of claim 1, wherein, The pump body is further provided with a liquid outlet cavity (27), and the liquid outlet cavity (27) is provided with a liquid outlet valve (28), and the liquid outlet valve (28) is used to control the communication between the liquid outlet flow path and the control flow path (24).

9. The plunger pump of claim 1, wherein, The pump body is further provided with a liquid collection cavity (26), and the liquid collection cavity (26) is used to collect the liquid in the liquid suction cavity (21); Wherein, the liquid suction cavity (21) communicates with the second flow path (23) through the liquid collection cavity (26).

10. The plunger pump of claim 1, wherein, The pump body comprises a first pump body (1) and a second pump body (2), and the first pump body (1) and the second pump body (2) are in series communication, the first pump body (1) can output low-pressure liquid, and the second pump body (2) can output high-pressure liquid; Wherein, the total liquid inlet (11) is arranged on the first pump body (1); The liquid suction cavity (21), the liquid outlet flow path, the control flow path (24) and the total liquid outlet (25) are arranged on the second pump body (2).

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