Water pump head

Abstract

The utility model belongs to the technical field of water pumps, and particularly relates to a water pump head which comprises a pump head body, the pump head body is provided with a low-pressure water inlet part, a pressurizing part and a high-pressure water outlet part, the low-pressure water inlet part is provided with a water inlet and a flow switch, an impeller is arranged in the pressurizing part, and the high-pressure water outlet part is provided with a water outlet and a pressure sensor. A first mounting opening is formed in the surface of the high-pressure water outlet part, a support assembly is arranged in the first mounting opening, and the pressure sensor is mounted through the support assembly; according to the utility model, the installation of the pressure sensor is realized through the support assembly, and a manufacturer does not need to form a threaded opening structure for connecting the pressure sensor at the high-pressure water outlet part through the support assembly which is matched and internally and externally connected.

Description

Technical Field

[0001] This patent application belongs to the field of water pump technology, and specifically refers to a water pump head. Background Technology

[0002] Referring to the pump head split structure disclosed in Chinese Utility Model No. 202323621580X, it includes a pump head body, which includes an inlet pipe section, a splicing part, and a main body. The inlet pipe section is fixedly connected to the splicing part, and the splicing part is fixedly connected to the main body.

[0003] The pump casing of this utility model is made of cast iron through sand casting, and it has threaded interfaces for installing flow switches and pressure switches, resulting in a complex overall structure and increased material usage for the pump casing. For manufacturers, the manufacturing process of threaded interfaces is more complex and costly than that of ordinary cylindrical interfaces. Furthermore, to improve pump quality, existing manufacturers consider changing the pump head material from cast iron sand casting to stainless steel sand casting. However, the manufacturing process for threaded interfaces in stainless steel pumps is even more complex and costly. Summary of the Invention

[0004] The purpose of this patent application is to provide a water pump head with a simplified component installation structure.

[0005] The purpose of this patent application is achieved as follows:

[0006] A water pump head includes a pump head body, which has a low-pressure water inlet section, a pressurizing section and a high-pressure water outlet section. The low-pressure water inlet section is provided with a water inlet and a flow switch. The pressurizing section is provided with an impeller. The high-pressure water outlet section is provided with a water outlet and a pressure sensor.

[0007] The surface of the high-pressure water outlet is provided with a first mounting port, and a support assembly is provided in the first mounting port, through which the pressure sensor is mounted.

[0008] The support assembly includes:

[0009] The mounting base is inserted into the first mounting port, and one end of the mounting base is provided with a limiting boss located inside the high-pressure water outlet; the pressure sensor is fixed on the mounting base.

[0010] The locking component is detachably fixed to the mounting base; the locking component, together with the limiting boss, limits the mounting base to the first mounting opening both internally and externally.

[0011] Furthermore, the mounting base is provided with external threads, and the locking member is detached and fixed to the mounting base through the external threaded shell.

[0012] Furthermore, a positioning groove is provided on the upper part of the limiting boss, and a positioning protrusion corresponding to the positioning groove is provided in the high-pressure water outlet part.

[0013] Furthermore, the outer edge of the first mounting port is provided with an annular first sealing boss, and the limiting boss is provided with an annular second sealing boss. When the limiting boss is limited to the inner side of the first mounting port, the first sealing boss and the second sealing boss are radially opposite each other.

[0014] Furthermore, the mounting base shaft has a mounting groove for placing the pressure sensor, the pressure sensor passes through the mounting base, and the end face of the pressure sensor is connected to the end face of the mounting base by fasteners.

[0015] Furthermore, the surface of the high-pressure water outlet is also provided with a second mounting port; it also includes a pressure tank, which includes an outer tank body, an inner tank body connected by their edges, and a diaphragm component located between the outer tank body and the inner tank body;

[0016] The opening end of the inner tank is opposite to the second mounting port, and a connecting boss is provided on the outer edge of the inner tank to connect with the high-pressure water outlet.

[0017] Furthermore, the support assembly is coaxially disposed on the high-pressure water outlet section with the pressure tank.

[0018] Furthermore, it also includes a guide plate, which is disposed in the high-pressure water outlet section and faces the pressurization section, and the guide plate is provided with a plurality of flow ports;

[0019] The guide plate has slots at both ends facing opposite directions, and the two slots abut against the edge of the mounting base and the edge of the inner tank, respectively.

[0020] Furthermore, the guide plate includes an arc-shaped guide surface, one side of which is provided with a first slot that abuts against the edge of the limiting boss; the other side of the arc-shaped guide surface is provided with an offset fan-shaped extension surface, and the outer side of the fan-shaped extension surface is provided with a second slot that abuts against the edge of the inner tank.

[0021] The arc-shaped guide surface is further provided with offset extended guide surfaces at both ends. The arc-shaped guide surface, the extended guide surface and the fan-shaped extended surface are connected to block the space between the pressurization section and the high-pressure water outlet section.

[0022] Furthermore, the pump head body is made of stainless steel by sand casting.

[0023] The outstanding and beneficial technical effects of this patent application compared to the prior art are:

[0024] 1. This patent achieves the installation of the pressure sensor through the aforementioned support assembly. The matching internal and external connection of the support assembly eliminates the need for manufacturers to create threaded openings for connecting the pressure sensor at the high-pressure outlet. This advantage is particularly pronounced when the pump head in this patent is manufactured using a stainless steel sandblasting structure, eliminating the need for users to perform cumbersome processing on the stainless steel pump head. Furthermore, the support assembly in this patent can be made of plastic, effectively reducing material usage and controlling costs.

[0025] 2. The flow switch in this patent is installed entirely using additional components. For the pump head, only a simple cylindrical structure and annular groove structure are needed, without the need for complex threaded structures, thus effectively reducing the processing steps of the pump head. The aforementioned additional components, namely the mounting sleeve and connecting seat described in this patent, can be made of plastic material. Compared with the material of the pump head, plastic material is cheaper and more easily accepted by manufacturers. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a water pump.

[0027] Figure 2 This is a schematic diagram of the pump casing after the flow switch has been disassembled.

[0028] Figure 3 This is a schematic diagram showing the disassembly of the pump casing and the flow switch.

[0029] Figure 4 yes Figure 1 A schematic diagram of the cross-section of the flow switch.

[0030] Figure 5 This is a breakdown diagram of the support assembly.

[0031] Figure 6 This is a schematic diagram showing the separation of the high-pressure water outlet and the pressure tank.

[0032] Figure 7 This is a diagram showing the disassembly of the mounting base and the high-pressure water outlet.

[0033] Figure 8 yes Figure 1 A schematic diagram of the cross-section at the pressure sensor.

[0034] Figure 9 This is a structural diagram of the mounting base, guide plate, and inner tank.

[0035] Figure 10 This is a schematic diagram of the structure of the baffle plate and the inner tank.

[0036] The meaning of the labels in the diagram:

[0037] 1. Pump head body;

[0038] 2. Low-pressure water inlet; 21. Water inlet; 22. Flow switch; 221. Detection end; 222. Connecting seat; 23. Detection tube section; 231. Annular groove; 24. Mounting sleeve; 241. First arc clamp; 242. Second arc clamp; 243. Clamping strip section; 244. Extension section; 25. Switch mounting hole;

[0039] 3. Pressurization section; 31. Impeller;

[0040] 4. High-pressure water outlet; 41. Water outlet; 42. Pressure sensor; 43. First mounting port; 431. First sealing boss; 432. Positioning boss; 44. Support assembly; 441. Mounting base; 4411. Mounting groove; 442. Locking element; 443. Limiting boss; 4431. Second sealing boss; 4432. Positioning groove; 444. External thread; 445. Internal thread; 451. First surface; 452. Second surface; 453. Outer ring surface;

[0041] 46. ​​Deflector plate; 461. Arc-shaped deflector surface; 462. Extended deflector surface; 463. Fan-shaped extended surface; 464. Second slot; 465. First slot; 466. Flow port; 48. Second mounting port; 49. Pressure tank; 491. Outer tank body; 492. Inner tank body; 493. Diaphragm component; 494. Connecting boss; 495. Connection port;

[0042] 5. Electric motor; Detailed Implementation

[0043] The present patent application will be further described below with reference to specific embodiments:

[0044] A water pump head includes a pump head body 1, which has a low-pressure water inlet 2, a pressurizing part 3 and a high-pressure water outlet 4. The low-pressure water inlet 2 is provided with a water inlet 21 and a flow switch 22. The pressurizing part 3 is provided with an impeller 31. The high-pressure water outlet 4 is provided with a water outlet 41 and a pressure sensor 42.

[0045] refer to Figure 1 The water pump in this patent also includes a motor 5, which drives an impeller 31. The impeller 31 is located in the pressurizing part 3. The low-pressure water inlet 2 is located on the left side of the pressurizing part 3. The water inlet 21 is formed laterally on the left side of the low-pressure water inlet 2 and is used to connect to an external water source. The flow switch 22 is located above the water inlet 21. The high-pressure water outlet 4 is located on the right side of the pressurizing part 3, and the water outlet 41 is provided at the top of the high-pressure water outlet 4.

[0046] The low-pressure water inlet 2 is equipped with a detection tube 23, and a mounting sleeve 24 is detachably fitted over the detection tube 23. The flow switch 22 has a detection end 221 inserted into the detection tube 23 and a connecting seat 222 abutting against the opening of the detection tube 23. The connecting seat 222 is detachably connected to the mounting sleeve 24. Figure 2-4 As shown, the detection tube 23 is integrally formed on the upper end of the low-pressure water inlet 2 and is cylindrical. In this embodiment, an annular groove 231 is provided on the outside of the detection tube 23. The annular groove 231 is directly formed on the detection tube 23 during the casting of the pump head body 1, and the pump head body 23 is installed in the annular groove 231.

[0047] The mounting sleeve 24 includes a first arc clamp 241 and a second arc clamp 242 connected to each other. The first arc clamp 241 and the second arc clamp 242 are semi-circular arcs, and their lengths are adapted to the size of the annular groove 231. They can be directly clamped in the annular groove 231. The two are fixedly connected by fasteners at both ends of the first arc clamp 241 and the second arc clamp 242. At this time, the first arc clamp 241 and the second arc clamp 242 are connected to form the mounting sleeve 24, and the mounting sleeve 24 is fixed in the annular groove 231.

[0048] The first arc-shaped clamp 241 and the second arc-shaped clamp 242 have a certain thickness. After being clamped inside the annular groove 231, a portion of the first arc-shaped clamp 241 and the second arc-shaped clamp 242 will be exposed outside the annular groove 231. The exposed portion is used to connect with the flow switch 22. Figure 3 As shown, the connecting seat 222 of the flow switch 22 is cylindrical. The outer diameter of the connecting seat 222 is larger than the outer diameter of the detection end 221 and the detection tube 23. After the detection end 221 is inserted into the detection tube 23, the connecting seat 222 of the flow switch 22 simultaneously abuts against the opening of the detection tube 23. At this time, the connecting seat 222 abuts against the exposed end face of the mounting sleeve 24. The two can be connected by setting fasteners between the mounting sleeve 24 and the connecting seat 222. Figure 3 As shown, the mounting sleeve 24 and the connecting seat 222 in this patent are provided with corresponding switch mounting holes 25. In this embodiment, the switch mounting holes 25 are threaded holes. Correspondingly, the fasteners are screws. The mounting sleeve 24 and the connecting seat 222 are connected by connecting the screws into the switch mounting holes 25 on the mounting sleeve 24 and the connecting seat 222, thereby fixing the flow switch 22 on the low-pressure water inlet 2. In fact, some seals are also provided between the mounting seat and the detection tube 23 to prevent water leakage, so that the water pump in this patent can operate normally.

[0049] To increase the stability of the flow switch 22 after installation, the position of the annular groove 231 or the structure of the mounting sleeve 24 is adjusted so that when the mounting sleeve 24 is installed in the annular groove 231, the axial surface of the mounting sleeve 24 is flush with the opening of the detection tube 23. Specifically, as follows... Figure 3 As shown, the first arc clamp 241 and the second arc clamp 242 in this patent include a retaining strip 243 embedded in the switch, and an extension 224 connected to one side of the retaining strip 243. The extension 224 covers the outside of the opening of the detection tube 23, so that the axial surface of the mounting sleeve 24 is flush with the opening of the detection tube 23. By making the axial surface of the mounting sleeve 24 flush with the opening of the detection tube 23, the distance between the mounting sleeve 24 and the connecting seat 222 is eliminated, which facilitates the quick alignment of the fasteners with the switch mounting holes 25 on the mounting sleeve 24 and the connecting seat 222, and makes the connection between the mounting sleeve 24 and the connecting seat 222 more stable.

[0050] In other embodiments, the annular groove 231 may not be provided, and the user can directly put the mounting sleeve 24 onto the outer wall of the detection tube 23. In comparison, the annular groove 231 provided in this embodiment helps the mounting sleeve 24 to be quickly positioned during installation, so that it can be installed more quickly.

[0051] Compared to the existing flow switch 22, the flow switch 22 in this patent is installed entirely with additional components. For the pump head body 1, only a simple cylindrical structure and annular groove 231 structure are needed. There is no need to set some complex threaded structures to install the flow switch 22, which effectively reduces the processing steps of the pump head body 1. The aforementioned additional components, namely the mounting sleeve 24 and the connecting seat 222 described in this patent, can be made of plastic material. Plastic material is cheaper than the material of the pump head body 1 and is more easily accepted by manufacturers.

[0052] The surface of the high-pressure water outlet 4 is provided with a first mounting port 43, and a support assembly 44 is provided in the first mounting port 43. The pressure sensor 42 is mounted through the support assembly 44. The support assembly 44 includes a mounting base 441 and a locking member 442. The mounting base 441 passes through the first mounting port 43, and one end of the mounting base 441 is provided with a limiting boss 443 located in the high-pressure water outlet 4. The pressure sensor 42 is fixed on the mounting base 441. The locking member 442 is detachably fixed on the mounting base 441. The locking member 442 cooperates with the limiting boss 443 to limit the mounting base 441 to the first mounting port 43 from both inside and outside.

[0053] refer to Figure 5-8As shown, the main body of the mounting base 441 is cylindrical, and its size is adapted to the diameter of the first mounting port 43. One end of the mounting base 441 is integrally formed with a limiting boss 443 whose outer diameter is larger than the outer diameter of its main body. During installation, the mounting base 441 extends outward from the high-pressure water outlet 4, so that the main body of the mounting base 441 passes through the first mounting port 43, and the limiting boss 443 abuts against the inner wall of the high-pressure water outlet 4. In this patent, the main body of the mounting base 441 is provided with an external thread 444, and the locking member 442 is annular with an internal thread 445. The locking member 442 is locked onto the mounting base 441 by the external thread 444, thereby fixing the mounting base 441 to the first mounting port 43.

[0054] refer to Figure 5 , 7 It should be noted that the pump head body 1 in this patent is made by stainless steel sand casting. The first mounting port 43, detection tube 23, inlet 21, and outlet 41 are all integrally formed on it during the sand casting process. In this embodiment, by adjusting the shape of the sand casting mold, the pump body of this patent is made into a flat shape, and the high-pressure water outlet 4 has a flat circular structure. The pump head body 1 made of stainless steel sand casting has better precision, making it easier to form the shape desired by the user. Since the high-pressure water outlet 4 in this patent has a flat circular structure, it has a first surface 451, a second surface 452, and an outer ring surface 453 surrounding the first surface 451 and the second surface 452. Part of the outer ring surface 453 is opened to connect with the pressurizing part 3, so that the pressurizing part 3 is connected to the inner cavity of the high-pressure water outlet 4.

[0055] The first mounting port 43 is directly formed on the first surface 451. The first mounting port 43 is a simple circular opening. During installation, the support assembly 44 only needs to assemble the mounting base 441 and the locking member 442 internally and externally, and then fix the pressure sensor 42 on the support assembly 44 to achieve the installation of the pressure sensor 42. Figure 5 As shown, the mounting base 441 has a mounting groove 4411 for placing the pressure sensor 42. The pressure sensor 42 passes through the mounting groove 4411 of the mounting base 441, and the end face of the pressure sensor 42 is connected to the end face of the mounting base 441 by fasteners. The fasteners are generally screws, and the pressure sensor 42 is directly fixed to the end face of the mounting base 441 by screws.

[0056] In summary, this patent achieves the installation of the pressure sensor 42 through the support assembly 44. The matching internal and external connections of the support assembly 44 eliminate the need for the manufacturer to create a threaded opening in the high-pressure outlet section 4 for connecting the pressure sensor 42. This advantage is particularly pronounced when the pump head body 1 in this patent is manufactured using a stainless steel sandblasting structure, eliminating the need for cumbersome processing on the stainless steel pump head. Furthermore, the support assembly 44 can be made of plastic, effectively reducing material usage and controlling costs.

[0057] Furthermore, the outer edge of the first mounting opening 43 is provided with an annular first sealing boss 431, and the limiting boss 443 is provided with an annular second sealing boss 4431. When the limiting boss 443 is limited to the inner side of the first mounting opening 43, the first sealing boss 431 and the second sealing boss 4431 are radially opposite each other. Figure 5 , 7 As shown, the first sealing boss 431 is integrally formed on the inner side of the high-pressure water outlet 4. The sealing performance of the mounting base 441 after it is installed in the high-pressure water outlet 4 is further increased by the first sealing boss 431 and the second sealing boss 4431 being radially opposite to each other.

[0058] Furthermore, a positioning groove 4432 is provided on the upper part of the limiting boss 443, and a positioning protrusion 432 corresponding to the positioning groove 4432 is provided in the high-pressure water outlet part 4. Figure 7 As shown, the positioning protrusions 432 are arranged on the left and right sides of the first mounting opening 43. Correspondingly, the positioning grooves 4432 are formed on the left and right sides of the limiting protrusions 443. They are used to achieve quick positioning through the mutual engagement of the positioning grooves 4432 and the positioning protrusions 432, which makes it easier for users to install.

[0059] Furthermore, the surface of the high-pressure water outlet 4 is provided with a second mounting port 48; it also includes a pressure tank 49, which includes an outer tank body 491 and an inner tank body 492 connected by their edges, and a diaphragm 493 located between the outer tank body 491 and the inner tank body 492; the opening end of the inner tank body 492 is opposite to the second mounting port 48, and a connecting boss 494 connected to the high-pressure water outlet 4 is provided on the outer edge of the inner tank body 492.

[0060] like Figure 6As shown, the second mounting port 48 is located on the second plane. In fact, the second plane is basically open, with only a boss structure for increasing the sealing element on its edge. The size of the opening end of the inner tank 492 is adapted to the size of the second mounting port 48. The outer edge of the inner tank 492 is integrally formed with a connecting boss 494 that can be fastened to the second plane. At this time, the inner tank 492 is opposite to the inner cavity of the second mounting port 48 and the high-pressure water outlet 4. When the pump head body 1 is working, its water flow will flow into the inner tank 492, and the pressure is stabilized by the pressure tank 49. The connection between the inner tank 492 and the high-pressure water outlet 4 is achieved by fasteners. That is, the outer ring surface 453 of the high-pressure water outlet 4 is provided with several connecting ports 495 opposite to the connecting boss 494. Screws are provided in the connecting ports 495 to connect with the connecting boss 494. In summary, by having the opening end of the inner tank 492 opposite to the second mounting port 48 and connecting it with the connecting boss 494, the joint structure for mutual connection between the pressure tank 49 and the pump head body 1 is eliminated, thereby simplifying the structure of the pump head body 1 and reducing the manufacturing difficulty and processes of the pump head body 1.

[0061] Furthermore, it also includes a guide plate 46, which is disposed in the high-pressure water outlet 4 and faces the pressurization part 3. The guide plate 46 is provided with a plurality of flow ports 466. The two ends of the guide plate 46 are respectively provided with slots facing opposite directions, and the two slots respectively abut against the edge of the limiting boss 443 and the edge of the inner tank 492.

[0062] like Figure 6 , 9As shown in Figure 10, the guide plate 46 in this patent includes an arc-shaped guide surface 461 facing the pressurizing part 3. Both ends of the arc-shaped guide surface 461 are bent downward to form extended guide surfaces 462, which are used to abut against the inner side of the outer ring surface 453 of the high-pressure water outlet part 4. On the other side of the arc-shaped guide surface 461, there is an offset fan-shaped extended surface 463. The lower end of the fan-shaped extended surface 463 is opposite to the edge of the inner tank 492. At this time, a second slot 464 that abuts against the edge of the inner tank 492 is provided on the outside of the fan-shaped extended surface 463, and a first slot 465 that abuts against the edge of the limiting boss 443 is provided on one side of the arc-shaped guide surface 461. The first slot 465 is specifically an upward-facing right-angled slot, and the second slot 464 is specifically a downward-facing right-angled slot. They respectively abut against the limiting boss 443 and the edge of the inner tank 492. Since the positions of the limiting boss 443 and the inner tank 492 are relatively fixed after installation, the slots restrict the guide plate 46 between the limiting boss 443 and the edge of the inner tank 492. It should be noted that, since the support assembly 44 and the pressure tank 49 in this patent are respectively connected to the first and second planes of the high-pressure water outlet 4, and the support assembly 44 and the pressure tank 49 are located on opposite sides of the guide plate 46, when the guide plate 46 is positioned between the support assembly 44 and the pressure tank 49 through its slots, it can block the pressurization part 3 and the high-pressure water outlet 4.

[0063] Existing guide plates 46 are all directly formed into the high-pressure water outlet section 4 by integral molding. This patent eliminates the connection structure between the guide plate 46 and the high-pressure water outlet section 4 by using a slot part. It makes good use of the components in the high-pressure water outlet section 4, so that it can be directly manufactured separately and stably installed in the high-pressure water outlet section 4. This allows the manufacturer to eliminate the manufacturing process of setting the guide plate 46 in the pump head body 1.

[0064] The above embodiments are merely preferred embodiments of this patent application and are not intended to limit the scope of protection of this patent application. Therefore, all equivalent changes made to the structure, shape, and principle of this patent application should be covered within the scope of protection of this patent application.

[0065] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this patent application. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this patent application, should still fall within the scope of the technical content disclosed in this patent application. Furthermore, the terms such as "above," "below," "left," "right," "middle," and "one" used in this specification are merely for clarity and are not intended to limit the scope of this patent application. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this patent application.

[0066] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0067] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

Claims

1. A water pump head, characterized in that: The pump head body (1) includes a low-pressure water inlet (2), a pressurizing part (3) and a high-pressure water outlet (4). The low-pressure water inlet (2) is provided with an inlet (21) and a flow switch (22). The pressurizing part (3) is provided with an impeller (31). The high-pressure water outlet (4) is provided with an outlet (41) and a pressure sensor (42). The surface of the high-pressure water outlet (4) is provided with a first mounting port (43), and a support assembly (44) is provided in the first mounting port (43). The pressure sensor (42) is installed through the support assembly (44). The support assembly (44) includes: The mounting base (441) is inserted into the first mounting port (43), and one end of the mounting base (441) is provided with a limiting boss (443) located in the high pressure water outlet (4); the pressure sensor (42) is fixed on the mounting base (441); The locking member (442) is detachably fixed on the mounting base (441); the locking member (442) cooperates with the limiting boss (443) to limit the mounting base (441) to the first mounting port (43) from the inside and outside respectively.

2. The pump head according to claim 1, characterized in that: The mounting base (441) is provided with an external thread (444), and the locking member (442) is detached and fixed on the mounting base (441) through the external thread (444).

3. The pump head according to claim 1, characterized in that: The limiting boss (443) has a positioning groove (4432) on its upper part, and the high-pressure water outlet (4) has a positioning protrusion (432) corresponding to the positioning groove (4432).

4. The pump head according to claim 1, characterized in that: The outer edge of the first mounting port (43) is provided with an annular first sealing boss (431), and the limiting boss (443) is provided with an annular second sealing boss (4431). When the limiting boss (443) is limited to the inner side of the first mounting port (43), the first sealing boss (431) and the second sealing boss (4431) are radially opposite each other.

5. The pump head according to claim 1, characterized in that: The mounting base (441) has a mounting groove (4411) for placing the pressure sensor (42) in the shaft. The pressure sensor (42) passes through the mounting base (441), and the end face of the pressure sensor (42) is connected to the end face of the mounting base (441) by fasteners.

6. The pump head according to claim 1, characterized in that: The surface of the high-pressure water outlet (4) is also provided with a second installation port (48); it also includes a pressure tank (49), which includes an outer tank body (491) and an inner tank body (492) connected by their edges, and a diaphragm (493) located between the outer tank body (491) and the inner tank body (492); The opening end of the inner tank (492) is opposite to the second mounting port (48), and a connecting boss (494) is provided on the outer edge of the inner tank (492) to connect with the high-pressure water outlet (4).

7. The pump head according to claim 6, characterized in that: The support assembly (44) is coaxially mounted on the high-pressure water outlet (4) with the pressure tank (49).

8. The pump head according to claim 6, characterized in that: It also includes a guide plate (46), which is disposed in the high-pressure water outlet (4) and faces the pressurization part (3), and the guide plate (46) is provided with a plurality of flow ports (466); The guide plate (46) has slots at both ends facing opposite directions, and the two slots abut against the edge of the mounting base (441) and the edge of the inner tank (492), respectively.

9. The pump head according to claim 8, characterized in that: The guide plate (46) includes an arc-shaped guide surface (461), one side of which is provided with a first slot (465) that abuts against the edge of the limiting boss (443); the other side of the arc-shaped guide surface (461) is provided with an offset fan-shaped extension surface (463), and the outside of the fan-shaped extension surface (463) is provided with a second slot (464) that abuts against the edge of the inner tank (492); The arc-shaped guide surface (461) is further provided with offset extended guide surfaces (462) at both ends. The arc-shaped guide surface (461), the extended guide surface (462) and the fan-shaped extended surface (463) are connected to block between the pressurizing part (3) and the high-pressure water outlet part (4).

10. The pump head according to any one of claims 1-8, characterized in that: The pump head body (1) is made of stainless steel by sand casting.

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