Diaphragm booster pump

Abstract

The utility model relates to the technical field of water pumps, in particular to a diaphragm booster pump which comprises a shell, a pump head end cover, a motor, a driving shaft and a diaphragm assembly, the diaphragm assembly comprises a diaphragm and a transmission part acting on the diaphragm, the transmission part comprises an eccentric wheel, and an insulation partition part is arranged in the shell and divides an inner cavity of the shell into a main cavity and a diaphragm chamber. A penetrating hole is formed in the insulating partition part, the diaphragm assembly is arranged in the diaphragm chamber, the motor and the first bearing are arranged in the main chamber, the first bearing is fixedly connected with the insulating partition part or the shell through a fastener, the driving shaft penetrates through the penetrating hole and is connected with the first bearing through a fixing piece, and the first bearing supports the fixing piece at least towards the direction of the diaphragm. The eccentric wheel is separated from the first bearing in an insulating mode and supported, the electric shock risk is reduced by improving the insulating performance of the diaphragm booster pump, the diaphragm booster pump is not limited to the adoption of a low-voltage motor, the pump head water pressure thrust is overcome by supporting the eccentric wheel, and the insufficient water pressure of the pump head is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of water pumps, and in particular to a diaphragm booster pump. Background Art

[0002] Existing reverse osmosis water purifiers require a booster pump to increase water pressure and improve water production efficiency. For example, a diaphragm booster pump uses a diaphragm to periodically move, driving a rubber valve to periodically close and open the outlet port on the outlet valve seat to achieve water discharge. Existing diaphragm booster pumps in water purifiers are typically driven by a low-voltage motor. This is because existing booster pumps have a low water resistance rating and are susceptible to motor leakage due to water leaks. Using a low-voltage motor, even if leakage occurs, does not pose a risk of electric shock. However, using a low-voltage motor requires an adapter to convert mains electricity to low-voltage DC power for the motor, which increases costs.

[0003] Existing diaphragm booster pumps have a low waterproof rating because the eccentric wheel mounted on the drive shaft rotates together with the drive shaft bearing. The bearing is located between the motor and the eccentric wheel, and the eccentric wheel is supported by the bearing, thereby supporting both the eccentric wheel and the drive shaft. This prevents the water pressure from the pump head from pushing the eccentric wheel and the drive shaft toward the motor, thereby avoiding problems such as insufficient water pressure and excessive motor load or jamming, ensuring the normal operation of the diaphragm booster pump. However, this structure makes it easy for water to leak between the eccentric wheel and the bearing. After water flows into the motor, it causes the motor to short-circuit and discharge outward, or the motor itself fails and discharges outward through the water flow. Therefore, to avoid the risk of electric shock, the only high-cost solution is to use a combination of an adapter and a low-voltage motor.

[0004] In other words, in order to support the eccentric wheel and the drive shaft to prevent the influence of water pressure, the existing diaphragm booster pump can only reduce the waterproof level of the structure, and thus can only adopt a high-cost solution of combining an adapter and a low-voltage motor. Summary of the Invention

[0005] The present application makes improvements to the problems existing in the above-mentioned prior art. That is, the purpose of the present application is to provide a diaphragm booster pump, which can insulate and separate the eccentric wheel and the first bearing from each other, and support the eccentric wheel. It not only reduces the risk of electric shock by improving the insulation performance of the diaphragm booster pump, so that it is not limited to the use of low-voltage motors, but also overcomes the thrust of the pump head water pressure by supporting the eccentric wheel, thereby avoiding insufficient water pressure in the pump head and ensuring the normal operation of the diaphragm booster pump.

[0006] An embodiment of the present application provides a diaphragm booster pump, including a housing, a pump head end cover, a motor, a drive shaft and a diaphragm assembly, the diaphragm assembly including a diaphragm and a transmission part acting on the diaphragm, the transmission part including an eccentric wheel, the motor being connected to the eccentric wheel via the drive shaft, a first bearing being provided between the motor and the eccentric wheel, the pump head end cover being connected to the housing and forming a booster chamber, an insulating partition being provided in the housing, the insulating partition dividing the inner cavity of the housing into a main chamber and a diaphragm chamber, a through hole being provided on the insulating partition, the diaphragm assembly being provided in the diaphragm chamber, the motor and the first bearing being provided in the main chamber, the first bearing being fixedly connected to the insulating partition or the housing by a fastener, the drive shaft passing through the through hole, and the drive shaft being connected to the first bearing via a fixing member, the first bearing supporting the fixing member at least toward the diaphragm.

[0007] In one embodiment, a first axial limiting structure is provided on a side of the first bearing facing the diaphragm assembly, the first axial limiting structure is fixedly connected to the fixing member, and / or the fixing member is injection molded on the first bearing.

[0008] In one embodiment, a second axial limiting structure is provided on the drive shaft, the second axial limiting structure is connected to the eccentric wheel, and / or the eccentric wheel is injection molded on the drive shaft, so that the drive shaft supports the eccentric wheel at least toward the diaphragm.

[0009] In one embodiment, the fixing member is spaced apart from, connected to, or integrally molded with the eccentric wheel, the drive shaft includes a main shaft and a slave shaft, the main shaft and the slave shaft are connected via the fixing member, and the fixing member isolates and insulates the main shaft from the slave shaft.

[0010] In one embodiment, the fixing member is connected to or integrally injection-molded with the eccentric wheel, and the fixing member and the eccentric wheel jointly cover the drive shaft. The eccentric wheel has a connecting hole for the drive shaft to pass through, and the connecting hole is provided with an insulating port sealing portion on the side facing the diaphragm.

[0011] In one embodiment, a third axial limiting structure is provided on the drive shaft, the third axial limiting structure is connected to the fixing member, and / or the fixing member is injection molded on the drive shaft, so that the fixing member supports the drive shaft at least toward the diaphragm.

[0012] In one embodiment, the fixing member is passed through the passing hole, and a rigid sleeve is fixed to the outer periphery of the fixing member.

[0013] In one embodiment, a sealing member is provided in the through hole, and the sealing member blocks a gap between the fixing member and / or the driving shaft and the through hole.

[0014] In one embodiment, the insulating partition portion encloses a bearing chamber and the through hole, the first bearing is fixed in the bearing chamber, the fastener is provided on the side of the first bearing facing the motor, and the fastener fixedly connects the first bearing and the insulating partition portion so that the fastener supports the first bearing at least toward the direction of the diaphragm.

[0015] In one embodiment, a first assembly hole is provided on a side of the fixing member facing the motor, and the main shaft is loosely fitted in the first assembly hole.

[0016] Beneficial effects:

[0017] In the embodiment of the present application, the insulating partition portion isolates the main chamber and the diaphragm chamber to improve the waterproof performance. Even if the diaphragm leaks, causing water to leak from the boost chamber into the diaphragm chamber, the insulating partition portion will isolate the water outside the main chamber at this time, and the insulating partition portion also has insulating properties to prevent water from contacting the motor and causing the motor to short-circuit and discharge outward, thereby reducing the risk of electric shock. It is not limited to the combination of a low-voltage motor and an adapter, and a high-voltage motor can also be directly used as a power source to eliminate the adapter and reduce costs; and the drive shaft is connected to the first bearing through a fixing part, so that the first bearing supports the fixing part at least in the direction of the diaphragm, thereby realizing axial support of the whole composed of the eccentric wheel and the drive shaft in the direction of the diaphragm, so that the whole composed of the eccentric wheel and the drive shaft can overcome the water pressure thrust to maintain its own position, avoid the displacement trend toward the motor, and thus avoid insufficient water pressure in the boost chamber and excessive load or even jamming of the motor, thereby ensuring the normal operation of the diaphragm booster pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments of the present application.

[0019] Figure 1 This is a schematic diagram of the overall structure of the first embodiment of the present application;

[0020] Figure 2 A schematic diagram of an implementation of the second embodiment of the present application;

[0021] Figure 3 A schematic diagram of an implementation of the second embodiment of the present application;

[0022] Figure 4 This is a schematic diagram of an implementation of a fixing member in the second embodiment of the present application;

[0023] Figure 5 This is a schematic diagram of an implementation of a fixing member in the second embodiment of the present application;

[0024] Figure 6A schematic diagram of an implementation of the third embodiment of the present application;

[0025] Figure 7 A schematic diagram of an implementation of the third embodiment of the present application;

[0026] Figure 8 This is a schematic diagram of an implementation of a fixing member in the fourth embodiment of the present application;

[0027] Figure 9 A schematic diagram of an implementation of a fixing member and an eccentric wheel in the fourth embodiment of the present application;

[0028] Figure 10 A schematic diagram of an implementation of a fixing member and an eccentric wheel in the fourth embodiment of the present application;

[0029] Figure 11 A schematic diagram of an implementation of a fixing member and an eccentric wheel in the fifth embodiment of the present application;

[0030] Figure 12 A schematic diagram of an implementation of the sixth embodiment of the present application;

[0031] Figure 13 A schematic diagram of an implementation of the sixth embodiment of the present application;

[0032] Figure 14 A schematic diagram of an implementation of the sixth embodiment of the present application;

[0033] Figure 15 A schematic diagram of an implementation of the sixth embodiment of the present application;

[0034] Figure 16 A schematic diagram of an implementation of the seventh embodiment of the present application;

[0035] Figure 17 A schematic diagram of an implementation of the seventh embodiment of the present application;

[0036] Figure 18 This is a schematic diagram of an implementation manner of a fixing member in the eighth embodiment of the present application;

[0037] Figure 19 A schematic diagram of an implementation of the ninth embodiment of the present application;

[0038] Figure markings: 100, housing, 110, insulating partition, 120, main chamber, 130, diaphragm chamber, 111, penetration hole, 112, sealing member, 113, bearing chamber, 200, pump head end cover, 210, boosting chamber, 300, motor, 400, diaphragm assembly, 410, diaphragm, 420, transmission part, 421, eccentric wheel, 422, connecting hole, 423, port sealing member, 500, drive shaft, 510, main shaft, 520, slave shaft, 530, second axial limiting structure, 540, third axial limiting structure, 600, first bearing, 610, fastener, 700, fixing member, 710, first axial limiting structure, 720, rigid sleeve, 730, first assembly hole, 740, second assembly hole, 750, blocking member, 800, slot. DETAILED DESCRIPTION

[0039] The following specific embodiments are merely explanations of the present application and are not limitations of the present application. After reading this specification, those skilled in the art may make modifications to the embodiments without any creative contribution as needed. However, as long as they are within the scope of the claims of the present application, they are protected by the patent law.

[0040] Reference Figure 1 As shown, the first embodiment of the present application discloses a diaphragm booster pump, including a housing 100, a pump head end cover 200, a motor 300, a drive shaft 500 and a diaphragm assembly 400, wherein the diaphragm assembly 400 includes a diaphragm 410 and a transmission part 420 acting on the diaphragm 410, the transmission part 420 includes an eccentric wheel 421, the motor 300 is connected to the eccentric wheel 421 through the drive shaft 500, and a first bearing 600 is provided between the motor 300 and the eccentric wheel 421, the first bearing 600 directly or indirectly supports the drive shaft 500, the pump head end cover 200 is connected to the housing 100 and forms a boosting chamber 210, and after the motor 300 is started, the eccentric wheel 421 is driven to move through the drive shaft 500, thereby making the diaphragm assembly 400 run and realizing water discharge from the boosting chamber 210.

[0041] In this first embodiment, an insulating partition portion 110 is provided in the outer shell 100, and the insulating partition portion 110 divides the inner cavity of the outer shell 100 into a main chamber 120 and a diaphragm chamber 130. A through hole 111 is provided on the insulating partition portion 110, wherein the diaphragm assembly 400 is provided in the diaphragm chamber 130, and the motor 300 and the first bearing 600 are provided in the main chamber 120. The first bearing 600 is fixedly connected to the insulating partition portion 110 or the outer shell 100 by a fastener 610, and the drive shaft 500 passes through the through hole 111 and is connected to the eccentric wheel 421. In this way, the insulating partition part 110 isolates the main chamber 120 and the diaphragm chamber 130, thereby improving the waterproof performance. In actual use, once the diaphragm 410 leaks, water will leak from the boost chamber 210 into the diaphragm chamber 130. At this time, the insulating partition part 110 isolates the water outside the main chamber 120, and the insulating partition part 110 also has insulating properties, which prevents water from contacting the motor 300 and causing the motor 300 to short-circuit and discharge outward, thereby reducing the risk of electric shock. It is not limited to the combination of a low-voltage motor 300 and an adapter, but a high-voltage motor 300 can also be directly used as a power source, eliminating the adapter and reducing costs.

[0042] In this first embodiment, during the operation of the diaphragm booster pump, the water pressure in the boosting chamber 210 generates a thrust on the diaphragm assembly 400 toward the motor 300, wherein the position of the diaphragm 410 is fixed, and the transmission part 420 acting on the diaphragm 410 is connected to the drive shaft 500 through the eccentric wheel 421, so the water pressure thrust acts on the whole composed of the eccentric wheel 421 and the drive shaft 500. If the eccentric wheel 421 or the drive shaft 500 does not receive corresponding support to overcome the water pressure thrust, then under the action of the water pressure thrust, the whole composed of the eccentric wheel 421 and the drive shaft 500 has a tendency to move toward the motor 300, which may cause the interaction between the transmission part 420 and the diaphragm 410 to no longer be tight, or even to separate from each other, resulting in insufficient water pressure in the boosting chamber 210, affecting the performance of the diaphragm booster pump, and may also cause the motor 300 to be overloaded due to the pressure on the drive shaft 500, or even the drive shaft 500 of the motor 300 to be stuck, causing the motor 300 to fail to operate normally. Different from the prior art solution in which the eccentric wheel 421 directly abuts against the bearing so that the whole composed of the eccentric wheel 421 and the drive shaft 500 is supported, in the first embodiment, the insulating partition 110 separates the main chamber 120 and the diaphragm chamber 130, and the eccentric wheel 421 and the first bearing 600 are also separated by the insulating partition 110, so the first bearing 600 cannot directly support the eccentric wheel 421, and the first bearing 600 itself is used to support the drive shaft 500 in the radial direction, so in this embodiment, the drive shaft 500 is not directly supported by the eccentric wheel 421. The moving shaft 500 is connected to the first bearing 600 through the fixing part 700. The first bearing 600 supports the fixing part 700 at least in the direction of the diaphragm 410, thereby realizing axial support of the whole composed of the eccentric wheel 421 and the driving shaft 500 in the direction of the diaphragm, so that the whole composed of the eccentric wheel 421 and the driving shaft 500 can overcome the water pressure thrust to maintain its own position, avoid the displacement tendency toward the motor 300, and thus avoid the situation of insufficient water pressure in the boost chamber 210 and excessive load or even jamming of the motor 300.

[0043] In this first embodiment, the eccentric wheel 421 is fixedly connected to the drive shaft 500, so that the eccentric wheel 421 and the drive shaft 500 form a whole to jointly overcome the water pressure thrust. Specifically, in some embodiments, the eccentric wheel 421 has a connecting hole 422, and the drive shaft 500 is interference fit with the connecting hole 422; the fixing member 700 is fixedly connected to the drive shaft 500, so that the fixing member 700 and the drive shaft 500 form a whole, and the first bearing 600 supports the drive shaft 500 in the direction of the diaphragm by supporting the fixing member 700 in the direction of the diaphragm.

[0044] In the second embodiment of the present application, the supporting connection relationship between the fixing member 700 and the first bearing 600 in the embodiment of the present application is further improved. The first bearing 600 is provided with a first axial limiting structure 710 on the side facing the diaphragm assembly 400. The first axial limiting structure 710 is fixedly connected to the fixing member 700, and / or the fixing member 700 is injection molded on the first bearing 600.

[0045] In the first implementation of the second embodiment, a first axial limiting structure 710 is provided on the side of the first bearing 600 facing the diaphragm assembly 400, and the first axial limiting structure 710 is fixedly connected to the fixing member 700. In this implementation, the fixing member 700 can be a structure having at least a surrounding portion covering a portion of the outer wall of the drive shaft 500, and the first axial limiting structure 710 is provided on the outer periphery of the fixing member 700, and at least one first axial limiting structure 710 is provided against the side of the first bearing 600 facing the eccentric wheel 421, referring to Figure 2 As shown, when the drive shaft 500 is thrust toward the motor 300 , the first bearing 600 can support the drive shaft 500 by supporting the first axial limiting structure 710 , thereby preventing the drive shaft 500 from displacing toward the motor 300 .

[0046] Further, refer to Figure 3 As shown, an auxiliary axial limiting structure 760 can also be provided against the first bearing 600 toward the motor 300 side to achieve complete axial limiting between the drive shaft 500 and the first bearing 600, further improving the axial position stability of the drive shaft 500. Among them, the first axial limiting structure 710 can be a flange structure directly formed on the outer periphery of the fixing member 700, which is against the first bearing 600 and has an outer diameter greater than the outer diameter of the fixing member 700 body. It can also be a blocking member fixed to the outer periphery of the fixing member 700, such as a retaining spring. In this case, a corresponding mounting groove needs to be provided on the outer periphery of the fixing member 700 (not shown in the drawings, refer to Figure 4 The card slot 800 in the middle is used for installing the blocking member.

[0047] Reference Figure 4As shown, when implementing this embodiment, taking into account the assembly problem, the auxiliary axial limiting structure 760 needs to be a detachable blocking member, such as a retaining spring. At this time, a corresponding groove 800 needs to be provided on the periphery of the fixing member 700 for the installation of the retaining spring. Because during assembly, the first bearing 600 is first assembled on the periphery of the fixing member 700 and abuts against the first axial limiting structure 710 located on the side of the first bearing 600 facing the eccentric wheel 421, and then the auxiliary axial limiting structure 760 is installed on the side of the first bearing 600 facing the motor 300, so as to realize complete axial limitation of the first bearing 600 and the fixing member 700; and the first axial limiting structure 710 provided on the side of the first bearing 600 facing the eccentric wheel 421 can be a flange structure directly formed on the fixing member 700, or it can be a detachable blocking member.

[0048] Of course, in this embodiment, the fixing member 700 can also be a blocking member directly fixed to the drive shaft 500, such as a retaining spring, which abuts against the first bearing 600 toward the side of the diaphragm assembly 400. A corresponding mounting groove needs to be provided on the drive shaft for the blocking member to be installed. The blocking member is installed in the mounting groove (not shown in the drawings, but can be referred to). Figure 4 The portion of the blocking member located in the mounting groove can be considered to be the fixing member 700 body, and the portion of the blocking member located outside the mounting groove can be considered to be the first axial limiting structure 710, which is used to abut against the first bearing 600. In this way, when the drive shaft 500 is subjected to a thrust toward the motor 300, the first bearing 600 can support the drive shaft 500 by supporting the blocking member, thereby preventing the drive shaft 500 from displacing toward the motor 300. Furthermore, a blocking member can be provided to abut against the side of the first bearing 600 facing the motor 300, serving as an auxiliary axial limiting structure 760, to achieve complete axial limitation between the drive shaft 500 and the first bearing 600, further improving the axial positional stability of the drive shaft 500.

[0049] It should be noted that in this first embodiment, the first axial limiting structure 710 acts on the inner ring of the first bearing, and the auxiliary axial limiting structure 760 also acts on the inner ring of the first bearing 600. The fixing member 700 and the inner ring of the first bearing 600 rotate together to avoid mutual wear.

[0050] In the second implementation of this second embodiment, the fixing member 700 is injection-molded onto the first bearing 600. Specifically, the fixing member 700 is injection-molded onto the inner ring of the first bearing 600. This injection molding method secures the fixing member 700 to the first bearing 600, thereby limiting the axial position of the fixing member 700 by the first bearing 600. During operation, the inner ring of the first bearing 600, the fixing member 700, and the drive shaft 500 rotate synchronously. This embodiment not only improves the fit between the fixing member 700 and the first bearing 600, but also eliminates the need for assembly.

[0051] In a third implementation of the second embodiment, the fixing member 700 is injection molded onto the first bearing 600, and a first axial limiting structure 710 is provided on the fixing member 700. In the second implementation, the injection-molded interface between the fixing member 700 and the inner ring of the first bearing 600 is primarily formed by the bond between the outer circumferential wall of the fixing member 700 and the inner circumferential wall of the inner ring of the first bearing 600. On the one hand, the injection-molded bonding force is limited, and on the other hand, when the drive shaft 500 is subjected to axial thrust, the injection-molded interface is subjected to shear force. Therefore, relying solely on the strength of the injection-molded bond may not be able to overcome the large hydraulic thrust. Therefore, in this embodiment, while the fixing member 700 is injection molded onto the first bearing 600, a first axial limiting structure 710 is also provided on the fixing member 700. Since the fixing member 700 is directly injection molded onto the first bearing 600, there is no need to consider the assembly problem between the two. The first axial limiting structure 710 can be directly formed on the outer periphery of the fixing member 700, which is located on the side of the first bearing 600 facing the diaphragm assembly 400. For example, a flange structure can be formed, the outer diameter of which is larger than the outer diameter of the fixing member 700 body. The first axial limiting structure 710 is attached to the inner ring of the first bearing 600 facing the eccentric wheel 421. Further, referring to Figure 5 As shown, an auxiliary axial limiting structure 760 can also be formed on the outer periphery of the fixing member 700 and located on the side of the first bearing 600 facing the motor 300. The auxiliary axial limiting structure 760 fits the inner ring of the first bearing 600 facing the motor 300. The fitting surfaces of the first axial limiting structure 710, the auxiliary axial limiting structure 760 and the first bearing 600 are injection-molded surfaces, which have injection-molded bonding strength and can further enhance the axial limiting effect of the first bearing 600 on the fixing member 700. Of course, the first axial limiting structure 710 can also be a blocking member provided on the outer periphery of the fixing member 700, such as a retaining spring. In this case, a corresponding mounting groove needs to be provided on the fixing member 700 (not shown in the accompanying drawings, but can be referred to). Figure 4 The card slot 800) is provided for installing the blocking member.

[0052] In the third embodiment of the present application, the connection relationship between the drive shaft 500 and the eccentric wheel 421 in the embodiment of the present application is improved. The drive shaft 500 is provided with a second axial limiting structure 530 connected to the eccentric wheel 421, and / or the eccentric wheel 421 is injection molded on the drive shaft 500, so that the drive shaft 500 supports the eccentric wheel 421 at least in the direction of the diaphragm 410. In the first embodiment of the present application, the first bearing 600 supports the fixing member 700 in the direction of the diaphragm 410 to achieve axial support of the drive shaft 500 in the direction of the diaphragm 410. Since the eccentric wheel 421 is fixedly connected to the drive shaft 500, the eccentric wheel 421 and the drive shaft 500 are regarded as a whole, and it is considered that the whole composed of the eccentric wheel 421 and the drive shaft 500 is axially limited in the direction of the diaphragm 410. However, the hydraulic thrust is applied to the whole composed of the eccentric wheel 421 and the drive shaft 500 through the eccentric wheel 421, so When the drive shaft 500 is axially limited by the first bearing 600 and overcomes the thrust, the support obtained by the eccentric wheel 421 mainly depends on the connection relationship between it and the drive shaft 500. Although the drive shaft 500 and the connecting hole 422 of the eccentric wheel 421 are interference fit, when the water pressure thrust is large, the eccentric wheel 421 may still have a displacement tendency relative to the drive shaft 500, especially when the eccentric wheel 421 is made of non-rigid materials, such as plastic, the connection strength between the eccentric wheel 421 and the drive shaft 500 is lower. Once the eccentric wheel 421 generates a displacement tendency relative to the drive shaft 500, the interaction between the transmission part 420 and the diaphragm 410 may no longer be tight, or even detach from each other, resulting in insufficient water pressure in the boosting chamber 210, affecting the performance of the diaphragm booster pump. Therefore, this third embodiment supports the eccentric wheel 421 toward the diaphragm 410 by setting a second axial limiting structure 530 to avoid the eccentric wheel 421 generating a displacement tendency relative to the drive shaft 500, thereby avoiding insufficient water pressure in the boosting chamber 210.

[0053] The first implementation of the third embodiment refers to Figure 6 As shown, the drive shaft 500 is provided with a second axial limiting structure 530, and the second axial limiting structure 530 is connected to the eccentric wheel 421. Specifically, the second axial limiting structure 530 abuts against the side of the eccentric wheel 421 facing the motor 300, thereby supporting the eccentric wheel 421 toward the diaphragm 410 to overcome its displacement tendency toward the motor 300. In this embodiment, the second axial limiting structure 530 is a blocking member fixed to the drive shaft 500, such as a retaining spring. In this case, a corresponding mounting groove needs to be provided on the drive shaft 500 (not shown in the drawings, but can be referred to). Figure 4 The card slot 800 in the middle is used for installing the blocking member. The second axial limiting structure 530 can also be a shoulder structure formed on the drive shaft 500, and the outer diameter of the shoulder structure is larger than the outer diameter of the drive shaft 500 body.

[0054] In a second implementation of the third embodiment, the eccentric 421 is injection molded onto the drive shaft 500. Specifically, the eccentric 421 has a connecting hole 422, and the drive shaft 500 is fixedly engaged with the connecting hole 422. Therefore, the inner circumferential wall of the connecting hole 422 and the corresponding outer circumferential wall of the drive shaft 500 form an injection-molded bonding surface, and an injection-molded bonding force is generated between the two. This enhances the connection strength between the eccentric 421 and the drive shaft 500, and the injection-molded bonding force overcomes the hydraulic thrust, preventing the eccentric 421 from shifting relative to the drive shaft 500. Since the drive shaft 500 extends through one end through an opening on one side of the connecting hole 422, the other opening of the connecting hole 422 is generally open, that is, the opening of the connecting hole 422 facing the diaphragm 410 is open. Therefore, further, in this embodiment, when the eccentric wheel 421 is injection molded on the drive shaft 500, the connection hole 422 can be opened toward the side of the diaphragm 410 and injection-molded to form a port blocking portion, and during the injection molding, the space between the opening on this side of the connection hole 422 and the end face of the drive shaft 500 can be completely injection-molded, leaving only the connection hole 422 open toward the side of the motor 300 for the drive shaft 500 to extend into. In this way, the eccentric wheel 421 is entirely covered on the end of the drive shaft 500, and the end face of the drive shaft 500 is connected and pressed against the port blocking portion, so that the drive shaft 500 supports the eccentric wheel 421 by supporting the port blocking portion, further avoiding the eccentric wheel 421 from generating an axial displacement tendency relative to the drive shaft 500.

[0055] In the third implementation of the third embodiment, the eccentric wheel 421 is injection molded on the drive shaft 500, and the drive shaft 500 is provided with a second axial limiting structure 530. The specific implementation of the eccentric wheel 421 being injection molded on the drive shaft 500 is referred to the second implementation of the third embodiment. Figure 7 As shown, the second axial limiting structure 530 can be a concave-convex structure formed on the drive shaft 500. In this way, when the eccentric wheel 421 is injection-molded on the drive shaft 500, a corresponding concave-convex structure is also injection-molded in the connecting hole 422 of the eccentric wheel 421. The concave-convex structure of the eccentric wheel 421 and the concave-convex structure of the drive shaft 500 engage with each other, so that the axial limitation between the eccentric wheel 421 and the drive shaft 500 can be achieved, and the axial displacement tendency of the eccentric wheel 421 relative to the drive shaft 500 can be avoided. The second axial limiting structure 530 can also be a blocking member fixed to the drive shaft 500, such as a retaining spring. In this case, a corresponding mounting groove needs to be set on the drive shaft 500 (not shown in the drawings, refer to Figure 4 The slot 800 in the drive shaft 500 is used for installing the blocking member; alternatively, the second axial limiting structure 530 is a shoulder structure formed on the drive shaft 500, and the outer diameter of the shoulder structure is larger than the outer diameter of the drive shaft 500 body; the second axial limiting structure 530 abuts against the side of the eccentric wheel 421 toward the motor 300, thereby supporting the eccentric wheel 421 to overcome its displacement tendency toward the motor 300.

[0056] In the fourth embodiment of the present application, the connection relationship between the fixing member 700 and the drive shaft 500 in the embodiment of the present application is improved. In this embodiment, the drive shaft 500 includes a main shaft 510 and a slave shaft 520, and the main shaft 510 and the slave shaft 520 are connected by the fixing member 700. The fixing member 700 isolates and insulates the main shaft 510 and the slave shaft 520. In some embodiments, referring to Figure 8 As shown, the fixing member 700 includes a first assembly hole 730 facing the motor 300, a second assembly hole 740 facing the eccentric wheel 421, and a blocking portion 750 located between the first assembly hole 730 and the second assembly hole 740. The first assembly hole 730 is assembled and connected to the main shaft 510, and the second assembly hole 740 is assembled and connected to the slave shaft 520. The blocking portion 750 separates the first assembly hole 730 and the second assembly hole 740. The main shaft 510 extends from the motor 300, and the slave shaft 520 is connected to the eccentric wheel 421. When the main shaft 510 rotates, the slave shaft 520 is driven to rotate through the fixing member 700, wherein the fixing member 700 is made of insulating material. In this embodiment, the fixing member 700 is located between the main shaft 510 and the slave shaft 520, and is respectively matched with the main shaft 510 and the slave shaft 520 in terms of hole and shaft, that is, the fixing member 700 is used as a coupling, which effectively improves the connection firmness between the fixing member 700 and the driving shaft 500, so that the first bearing 600 supports the fixing member 700 toward the diaphragm 410, thereby supporting the driving shaft 500 toward the diaphragm 410. Furthermore, in this embodiment, the fixing member 700 is made of an insulating material, meaning that the fixing member 700 also serves as an insulator. The fixing member 700 insulates the main shaft 510 from the secondary shaft 520. Even if the motor 300 short-circuits due to a fault and discharges electricity through the main shaft 510, the current cannot be transmitted to the secondary shaft 520 due to the blocking effect of the fixing member 700. Since the secondary shaft 520 is partially or completely located within the diaphragm chamber 130, even if water leaks from the diaphragm 410 and causes water to enter the diaphragm chamber 130, the motor 300 cannot leak electricity into the water through the secondary shaft 520, further reducing the risk of electric shock. In this embodiment, the thickness of the blocking portion 750 is greater than 1 mm to meet the electrical insulation requirements of the motor 300.

[0057] The first implementation of the fourth embodiment refers to Figure 9 As shown, the fixing member 700 is spaced apart from the eccentric 421, leaving the slave shaft 520 partially exposed. Because the blocking portion 750 of the fixing member 700 insulates the main shaft 510 from the slave shaft 520, even if the slave shaft 520 is exposed, there is no risk of leakage. The spacing between the fixing member 700 and the eccentric 421 saves material, and the two are not limited to being made of the same material. In this embodiment, the fixing member 700 and the eccentric 421 are separately assembled to the drive shaft 500.

[0058] The second implementation of the fourth embodiment refers to Figure 10As shown, the eccentric wheel 421 is also made of insulating material, such as plastic, and the fixing member 700 can be connected to the eccentric wheel 421 or injection molded as one piece. In this way, the fixing member 700 and the eccentric wheel 421 form a component with high integrity. The first bearing 600 can simultaneously support the drive shaft 500 and the eccentric wheel 421 in the direction of the diaphragm 410 by supporting the fixing member 700 in the direction of the diaphragm 410, which can prevent the drive shaft 500 and the eccentric wheel 421 from having a displacement tendency toward the motor 300 as a whole, and can also prevent the eccentric wheel 421 from having a displacement tendency toward the motor 300 relative to the drive shaft 500, further avoiding insufficient water pressure in the boost chamber 210 and excessive load or jamming of the motor 300. Wherein, the fixing member 700 is connected to the eccentric wheel 421, and the two are injection molded separately. The fixing member 700 can be extended to connect the eccentric wheel 421 that has been injection molded during injection molding, or the eccentric wheel 421 can be extended to connect the fixing member 700 that has been injection molded during injection molding, or a connecting member can be provided between the two. Wherein, if the fixing member 700 and the eccentric wheel 421 are integrally injection molded, the integrity of the two is higher and the axial limit support effect is better. Whether the fixing member 700 and the eccentric wheel 421 are mutually connected or integrally injection molded, the portion located between the fixing member 700 body and the eccentric wheel 421 body can be completely covered from the outer periphery of the shaft 520, or it can have a hollow area to expose the outer periphery of the shaft 520. In this embodiment, after the fixing member 700 and the eccentric wheel 421 are connected or integrally injection molded, they are assembled on the drive shaft 500.

[0059] Reference Figure 11As shown, in the fifth embodiment of the present application, the relationship between the fixing member 700 and the eccentric wheel 421 in the embodiment of the present application is improved, the fixing member 700 is connected to the eccentric wheel 421 or is integrally injection molded, and the fixing member 700 and the eccentric wheel 421 jointly cover the drive shaft 500, the eccentric wheel 421 has a connecting hole 422 for the drive shaft 500 to pass through, and the connecting hole 422 is provided with an insulating port sealing portion 423 on the side facing the diaphragm 410, wherein the covered portion of the drive shaft 500 corresponds to the portion of the fixing member 700 and the eccentric wheel 421, and does not necessarily mean that the entire drive shaft 500 is completely covered. In some embodiments, specifically, the drive shaft 500 is located between the diaphragm chamber 130 and The portion of the drive shaft 500 located in the main chamber 120 is covered, and the portion of the drive shaft 500 located in the diaphragm chamber 130 can be exposed. In this way, the portion of the drive shaft 500 located in the diaphragm chamber 130 is insulated and covered by the fixing member 700 and the eccentric wheel 421. The end face of the drive shaft 500 is insulated and sealed by the port seal 423 provided on the side of the connecting hole 422 facing the diaphragm 410. In this way, the outer surface of the portion of the drive shaft 500 located in the diaphragm chamber 130 is insulated. Even if the motor 300 short-circuits due to its own failure and causes the drive shaft 500 to be charged, the drive shaft 500 cannot discharge outward. At this time, even if water enters the diaphragm chamber 130, the water cannot contact the drive shaft 500, thereby reducing the risk of electric shock. In this fifth embodiment, the fixing member 700 and the eccentric wheel 421 are both made of insulating materials, such as plastic; the port seal 423 provided on the side of the connecting hole 422 facing the diaphragm 410 can be integrally formed with the eccentric wheel 421. In this embodiment, the fixing member 700 and the eccentric wheel 421 form an integral unit, and the first bearing 600 supports the fixing member 700 toward the diaphragm 410, thereby supporting the drive shaft 500 and the eccentric wheel 421 toward the diaphragm 410, thereby improving the axial limit support effect; in addition, a port seal 423 is provided on the eccentric wheel 421 on the side of the connecting hole 422 facing the diaphragm 410, and the end of the drive shaft 500 abuts against the port seal 423, further improving the axial limit support effect of the drive shaft 500 on the eccentric wheel 421, and preventing the eccentric wheel 421 from having a tendency to displace relative to the drive shaft 500 toward the motor 300. In this fifth embodiment, the fixing member 700 and the eccentric wheel 421 are connected or integrally injection molded and then assembled to the drive shaft 500.

[0060] In the first implementation of the fifth embodiment, the fixing member 700 is connected to the eccentric wheel 421, and the fixing member 700 and the eccentric wheel 421 are injection molded separately. The fixing member 700 can be extended to connect to the eccentric wheel 421 that has been injection molded during injection molding, or the eccentric wheel 421 can be extended to connect to the fixing member 700 that has been injection molded during injection molding. The area between the fixing member 700 or the eccentric wheel 421 is filled by axially extending the fixing member 700 or the eccentric wheel 421, thereby achieving the covering of the drive shaft 500. In this embodiment, there is an injection molding bonding surface between the fixing member 700 and the eccentric wheel 421, and still has good sealing performance. In the second implementation of the fifth embodiment, the fixing member 700 and the eccentric wheel 421 are integrally injection molded, and the fixing member 700 and the eccentric wheel 421 form an integral part, which effectively improves the insulation covering effect of the drive shaft 500 and simplifies the manufacturing and assembly process.

[0061] In the fourth embodiment of the present application, the drive shaft 500 is divided into a main shaft 510 and a slave shaft 520. The main shaft 510 and the slave shaft 520 are connected by a fixing member 700, and the fixing member 700 is made of insulating material, that is, the fixing member 700 is used as a coupling member and an insulating member at the same time. In this embodiment, the main shaft 510 and the slave shaft 520 are separated by the blocking portion 750 of the fixing member 700. However, when the fixing member 700 is made of insulating material, its own structural strength is low and its deformation resistance is poor, especially the blocking portion 750 with a smaller thickness in the fixing member 700, which is easily deformed when squeezed by external force. Therefore, in this embodiment, although the slave shaft 520 is cooperatively connected with the second assembly hole 740 of the fixing member 700, when the slave shaft 520 is subjected to a large water pressure thrust, the blocking portion 750 of the fixing member 700 is the portion of the fixing member 700 directly used to support and block the slave shaft 520. Once the blocking portion 750 is deformed toward the motor 300 or even broken by the slave shaft 520, the portion of the fixing member 700 corresponding to the second assembly hole 740 will also be deformed, causing the slave shaft 520 to be displaced toward the motor 300 and squeeze the main shaft 510, and the interaction between the transmission portion 420 and the diaphragm 410 is no longer tight or even detached from each other, which will cause insufficient water pressure in the boost chamber 210 and excessive load or jamming of the motor 300.

[0062] In the fifth embodiment of the present application, the fixing part 700 and the eccentric wheel 421 form an integral body that covers the drive shaft 500, and the end of the drive shaft 500 is insulated and sealed by the port sealing part 423 on the eccentric wheel 421. Generally speaking, most of the space of the connecting hole 422 of the eccentric wheel 421 is occupied by the drive shaft 500 extending therein to ensure the stability of the connection. The port sealing part 423 is only provided at the opening of the connecting hole 422 facing the diaphragm 410. The port sealing part 423 can be integrally formed with the eccentric wheel 421, that is, the port sealing part 423 is a part of the eccentric wheel 421, and the thickness of the port sealing part 423 is also relatively small. The port sealing part 423 and the eccentric wheel 421 are both made of insulating materials, such as plastic, so their own structural strength is relatively low and their deformation resistance is relatively poor. In this embodiment, the eccentric wheel 421 and the fixing part 700 are connected or integrally injection molded to form a whole, and then assembled on the drive shaft 500 as a whole, specifically, are sleeved on the drive shaft 500. Once the whole composed of the eccentric wheel 421 and the fixing part 700 tends to displace relative to the drive shaft 500, the drive shaft 500 will press the port sealing part 423 toward the diaphragm 410. Once the port sealing part 423 is deformed toward the diaphragm 410 or even broken by the drive shaft 500, it means that the drive shaft 500 fails to achieve axial limitation of the whole composed of the eccentric wheel 421 and the fixing part 700. This whole has displaced relative to the drive shaft 500, resulting in the interaction between the transmission part 420 and the diaphragm 410 no longer being tight or even separating from each other, resulting in insufficient water pressure in the boost chamber 210.

[0063] Therefore, the sixth embodiment of the present application improves the connection relationship between the fixing member 700 and the drive shaft 500 in the fourth and fifth embodiments. The drive shaft 500 is provided with a third axial limiting structure 540 connected to the fixing member 700, and / or the fixing member 700 is injection-molded on the drive shaft 500, so that the fixing member 700 supports the drive shaft 500 at least in the direction of the diaphragm 410. In this way, in the embodiment where the fixing member 700 is used as a coupling, the fixing member 700 provides axial limiting support for the slave shaft 520 at least in the direction of the diaphragm 410 through the third axial limiting structure and / or the injection molding bonding force, and does not rely solely on the assembly firmness of the slave shaft 520 and the fixing member 700 and the support of the barrier, thereby alleviating the supporting pressure of the barrier and improving the axial limiting support effect of the fixing member 700 on the slave shaft 520 in the direction of the diaphragm 410. In the embodiment where the fixing member 700 and the eccentric wheel 421 form an integral whole and are covered on the drive shaft 500, the fixing member 700 provides axial limiting support for the drive shaft 500 at least in the direction of the diaphragm 410 through the third axial limiting structure 540 and / or the injection molding bonding force, and does not rely solely on the assembly firmness of the drive shaft 500, the eccentric wheel 421 and the fixing member 700 as a whole and the support of the port sealing part 423, but relieves the supporting pressure of the port sealing part 423 and improves the axial limiting support effect of the drive shaft 500 on the whole composed of the eccentric wheel 421 and the fixing member 700.

[0064] The first implementation of the sixth embodiment improves the fourth embodiment, and a third axial limiting structure 540 is provided on the drive shaft 500, specifically, a third axial limiting structure 540 is provided on the slave shaft 520, and the third axial limiting structure 540 is against the side of the fixing member 700 facing the eccentric wheel 421. In this way, the fixing member 700 blocks the third axial limiting structure 540 to achieve blocking support for the slave shaft 520 in the direction of the diaphragm 410, thereby preventing the slave shaft 520 from having a displacement tendency toward the motor 300 relative to the fixing member 700. In this embodiment, the third axial limiting structure 540 can be a shoulder structure formed on the slave shaft 520, and the outer diameter of the shoulder structure is larger than the outer diameter of the slave shaft 520 body; the third axial limiting structure 540 can also be a blocking member fixed to the slave shaft 520, such as a retaining spring, refer to Figure 12 As shown, at this time, a mounting groove needs to be provided on the slave shaft 520 (not shown in the drawings, refer to Figure 4 The card slot 800) is provided for installing the blocking member.

[0065] The second implementation of the sixth embodiment improves the fourth and fifth embodiments. The fourth embodiment is improved by injection molding the fixing member 700 onto the slave shaft 520, so that the slave shaft 520 and the fixing member 700 not only have a hole-shaft fit but also have an injection molding bonding force, thereby improving the axial limiting effect of the fixing member 700 on the slave shaft 520. The fifth embodiment is improved by injection molding the fixing member 700 onto the drive shaft 500, so that the drive shaft 500 and the fixing member 700 not only have a hole-shaft fit but also have an injection molding bonding force, thereby improving the axial limiting effect of the drive shaft 500 on the entire structure consisting of the fixing member 700 and the eccentric 421; further, the eccentric 421 can also be injection molded onto the drive shaft 500.

[0066] The third implementation of the sixth embodiment improves the fourth and fifth embodiments. Figure 13 、 Figure 14 As shown, for the two situations where the fixing member 700 and the eccentric wheel 421 are spaced apart and connected to each other, the drive shaft 500 includes a main shaft 510 and a slave shaft 520, the fixing member 700 is injection-molded on the slave shaft 520, and a concave-convex structure is provided on the periphery of the slave shaft 520, which is the third axial limiting structure 540. In this way, when the fixing member 700 is injection-molded on the slave shaft 520, a corresponding concave-convex structure will also be formed, and the concave-convex structure of the slave shaft 520 and the concave-convex structure of the fixing member 700 are engaged with each other, so that there is both injection molding bonding force and the third axial limiting structure 540 between the slave shaft 520 and the fixing member 700, which effectively improves the axial limiting support effect of the fixing member 700 on the slave shaft 520. Among them, the fifth embodiment is improved, referring to Figure 15 As shown, the fixing part 700 is injection molded on the drive shaft 500, and a concave-convex structure is provided on the outer periphery of the drive shaft 500, which is the third axial limiting structure 540. In this way, when the fixing part 700 is injection molded on the drive shaft 500, a corresponding concave-convex structure will also be formed, and the concave-convex structure of the drive shaft 500 and the concave-convex structure of the fixing part 700 are engaged with each other, so that there is both injection molding bonding force and the third axial limiting structure 540 between the drive shaft 500 and the fixing part 700, which effectively improves the axial limiting support effect of the drive shaft 500 on the overall fixed part 700 and the eccentric wheel 421.

[0067] Reference Figure 16 、 Figure 17As shown, the seventh embodiment of the present application improves the through hole 111 of the insulating partition part 110 in the embodiment of the present application, and a sealing member 112, such as an oil seal, is provided in the through hole 111. The sealing member 112 blocks the gap between the fixing member 700 and / or the driving shaft 500 and the through hole 111, thereby improving the insulating partition effect of the insulating partition part 110 and improving the waterproof performance. In this embodiment, if the inner wall of the through hole 111 only corresponds to the outer peripheral wall of the fixing member 700, a sealing member 112 is only provided between the outer peripheral wall of the fixing member 700 and the inner wall of the through hole 111; if the inner wall of the through hole 111 only corresponds to the outer peripheral wall of the drive shaft 500, a sealing member 112 is only provided between the outer peripheral wall of the drive shaft 500 and the inner wall of the through hole 111; if the inner wall of the through hole 111 corresponds to the fixing member 700 and the drive shaft 500, a sealing member 112 is provided between the outer peripheral wall of the drive shaft 500 and / or the outer peripheral wall of the fixing member 700 and the inner wall of the through hole 111.

[0068] In the embodiment of the present application, the drive shaft 500 is connected to the eccentric wheel 421. When the eccentric wheel 421 rotates, the drive shaft 500 is also subjected to radial force, which may cause the drive shaft 500 to shake in the radial direction. Figure 18 As shown, the eighth embodiment of the present application improves the fixing member 700 in the embodiment of the present application. A rigid sleeve 720 is fixed on the periphery of the fixing member 700 so that the rigid sleeve 720 tightens the fixing member 700, thereby improving the structural strength of the fixing member 700 itself and reducing the radial deformation of the fixing member 700. This eighth embodiment improves the fourth embodiment. The drive shaft 500 includes a main shaft 510 and a slave shaft 520, and the main shaft 510 and the slave shaft 520 are connected by a fixing member 700. The fixing member 700 is used as a coupling. At this time, the slave shaft 520 is assembled in the second assembly hole 740 of the fixing member 700, and the fixing member 700 is made of insulating material, that is, it is also used as an insulating member. Therefore, the fixing member 700 is penetrated into the penetration hole 111 of the insulating partition part 110, so that the main shaft 510 is located in the main chamber 120 and the slave shaft 520 is located in the diaphragm chamber 130, which plays the role of isolating and insulating the main shaft 510 and the slave shaft 520. Therefore, the structural strength of the fixing member 700 itself is relatively low, resulting in the general radial support effect of the fixing member 700 on the slave shaft 520. Therefore, under the influence of the eccentric wheel 421, the slave shaft 520 may be more likely to generate radial shaking, affecting the performance of the diaphragm booster pump. In the eighth embodiment, the rigid sleeve 720 is fixed on the outer periphery of the fixing member 700, so that the fixing member 700 can obtain radial support from the rigid sleeve 720, and the structural strength of the fixing member 700 itself is improved, and it is not easy to deform in the radial direction, thereby improving the supporting effect of the fixing member 700 on the slave shaft 520 and improving the stability of the slave shaft 520.

[0069] Furthermore, based on the eighth embodiment, the seal 112 in the seventh embodiment can be arranged on the outer periphery of the rigid sleeve 720. In this way, when the fixing member 700 rotates with the drive shaft 500, the wear between the seal 112 and the fixing member 700 can be reduced, thereby improving the service life of the seal 112.

[0070] The ninth embodiment of the present application improves the installation and fixation of the first bearing 600 of the embodiment of the present application, referring to Figure 19 As shown, in this ninth embodiment, the insulating barrier portion 110 encloses a bearing chamber 113 and a through hole 111. The first bearing 600 is fixed in the bearing chamber 113. A fastener 610 is disposed on the side of the first bearing 600 facing the motor 300. The fastener 610 is fixedly connected to the first bearing 600 and the insulating barrier portion 110, so that the fastener 610 supports the first bearing 600 at least toward the diaphragm 410. The fastener 610 is annular in shape. Its outer portion is fixedly connected to the insulating barrier portion 110, such as by screws, while its inner portion abuts against the outer ring of the first bearing 600 to provide blocking support, thereby pre-tightening the first bearing 600 in the bearing chamber 113. When the first bearing 600 is subjected to a thrust toward the motor 300, the fastener 610 can support the first bearing 600 to overcome the thrust. Furthermore, in this embodiment, the inner diameter of the bearing chamber 113 is larger than the inner diameter of the through-hole 111, and the bearing chamber 113 is located on the side of the through-hole 111 facing the motor 300. As a result, the insulating barrier portion 110 as a whole has a stepped cylindrical structure, with a stepped surface facing the motor 300 between the bearing chamber 113 and the through-hole 111. When the fastener 610 pre-tightens the first bearing 600 in the bearing chamber 113, the first bearing 600 abuts the stepped surface, thereby achieving complete axial limitation of the first bearing 600 and further improving the positional stability of the first bearing 600. In some embodiments, the inner ring of the first bearing 600 does not abut the stepped surface, while the outer ring of the first bearing 600 abuts the stepped surface, preventing wear between the inner ring and the stepped surface during rotation.

[0071] The tenth embodiment of the present application further improves the fourth embodiment. In this embodiment, the driving shaft 500 includes a main shaft 510 and a slave shaft 520. The fixing member 700 is shown in FIG. Figure 8 As shown, the fixing member 700 is provided with a first assembly hole 730 on the side facing the motor 300, and the main shaft 510 is loosely matched with the first assembly hole 730, so that the main shaft 510 can produce a certain movement during operation, further reducing the possibility of the main shaft 510 getting stuck during operation, and can improve the noise reduction and heat dissipation effects of the main shaft 510.

[0072] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present application, and such modifications or substitutions should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A diaphragm booster pump, comprising a housing, a pump head end cover, a motor, a drive shaft, and a diaphragm assembly, wherein the diaphragm assembly comprises a diaphragm and a transmission portion acting on the diaphragm, the transmission portion comprising an eccentric wheel, the motor being connected to the eccentric wheel via the drive shaft, a first bearing being provided between the motor and the eccentric wheel, the pump head end cover being connected to the housing and forming a booster chamber, characterized in that: An insulating partition is provided in the shell, and the insulating partition divides the inner cavity of the shell into a main chamber and a diaphragm chamber. A through hole is provided on the insulating partition, and the diaphragm assembly is arranged in the diaphragm chamber. The motor and the first bearing are arranged in the main chamber. The first bearing is fixedly connected to the insulating partition or the shell by a fastener. The drive shaft passes through the through hole, and the drive shaft is connected to the first bearing through a fixing member. The first bearing supports the fixing member at least toward the diaphragm.

2. A diaphragm booster pump according to claim 1, characterized in that: A first axial limiting structure is provided on the side of the first bearing facing the diaphragm assembly. The first axial limiting structure is fixedly connected to the fixing member, and / or the fixing member is injection-molded on the first bearing.

3. A diaphragm booster pump according to claim 1, characterized in that: The drive shaft is provided with a second axial limiting structure, which is connected to the eccentric wheel, and / or the eccentric wheel is injection molded on the drive shaft, so that the drive shaft supports the eccentric wheel at least toward the diaphragm.

4. A diaphragm booster pump according to claim 1, characterized in that: The fixing member is spaced apart from, connected to or integrally molded with the eccentric wheel. The drive shaft includes a main shaft and a slave shaft. The main shaft and the slave shaft are connected via the fixing member, and the fixing member isolates and insulates the main shaft from the slave shaft.

5. The diaphragm booster pump according to claim 1, characterized in that: The fixing member is connected to or integrally injection-molded with the eccentric wheel. The fixing member and the eccentric wheel together cover the drive shaft. The eccentric wheel has a connecting hole for the drive shaft to pass through. The connecting hole is provided with an insulating port sealing portion on the side facing the diaphragm.

6. A diaphragm booster pump according to claim 4 or 5, characterized in that: The drive shaft is provided with a third axial limiting structure, the third axial limiting structure is connected to the fixing member, and / or the fixing member is injection molded on the drive shaft, so that the fixing member supports the drive shaft at least toward the diaphragm.

7. The diaphragm booster pump according to claim 4, characterized in that: The fixing piece is passed through the passing hole, and a rigid sleeve is fixed on the outer periphery of the fixing piece.

8. The diaphragm booster pump according to claim 1, characterized in that: A sealing member is provided in the penetration hole, and the sealing member blocks the gap between the fixing member and / or the driving shaft and the penetration hole.

9. The diaphragm booster pump according to claim 1, characterized in that: The insulating partition portion encloses a bearing chamber and the through hole, the first bearing is fixed in the bearing chamber, the fastener is provided on the side of the first bearing facing the motor, and the fastener fixedly connects the first bearing and the insulating partition portion so that the fastener supports the first bearing at least toward the direction of the diaphragm.

10. The diaphragm booster pump according to claim 4, characterized in that: The fixing member is provided with a first assembly hole on a side facing the motor, and the main shaft is clearance-fitted with the first assembly hole.

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