Check valve mechanism

Abstract

The invention relates to the technical field of engine oil supply, in particular to a check valve mechanism. The check valve mechanism comprises a pump body assembly, an adjusting rod and a check assembly, a mounting cavity, a first inlet and outlet and an adjusting hole are formed in the pump body assembly, and a sealing face is formed in the mounting cavity; one end of the adjusting rod is adjustably arranged in the adjusting hole in a penetrating manner, and the adjusting rod is provided with a first channel and a second inlet-outlet; the non-return assembly comprises a non-return valve body, a non-return valve element and an elastic piece, the non-return valve body is installed in the installation cavity, one end of the non-return valve element is arranged in the non-return valve body in a sliding mode, and the elastic piece is arranged between the non-return valve body and the non-return valve element; by adjusting the depth of the adjusting rod in the adjusting hole, the check valve element can be switched between the first position away from the sealing face to communicate the first inlet and outlet with the first channel and the second position abutting against the sealing face to cut off a passage between the first inlet and outlet and the first channel. According to the check valve mechanism, energy consumption can be reduced, the use cost can be reduced, and the installation efficiency can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engine oil supply, in particular to a check valve mechanism. BACKGROUND

[0002] The automobile fuel supply system requires maintaining a certain pressure after the vehicle is turned off, so a check valve mechanism is arranged at the oil outlet of the fuel pump to prevent the reverse flow of fuel in the system pipeline after the fuel pump stops working, thereby maintaining the pressure in the system pipeline. The working principle of the check valve mechanism is to use the kinetic energy and pressure difference of the fluid to drive the valve core to move, thereby opening and closing the valve port: when the fluid pressure at the inlet end is higher than that at the outlet end, and the pressure difference is sufficient to overcome the weight of the valve core, the spring force and other resistances, the valve core opens, and the fluid passes through; when the pressure at the inlet end decreases or the pressure at the outlet end reverses, the valve core closes under the action of gravity, spring force and reverse fluid pressure, preventing the backflow of fluid.

[0003] However, the check valve mechanism in the related art usually has the following problems:

[0004] 1) The opening of the valve port of the check valve mechanism depends on the fluid pressure, resulting in additional fluid kinetic energy loss during operation, which in turn causes insufficient fuel injection, insufficient flow during high load (uphill, overtaking), etc., affecting user experience and increasing user vehicle costs;

[0005] 2) The check valve mechanism only allows one-way flow of fluid, so the operator needs to install the check valve mechanism in the correct direction, resulting in low installation efficiency.

[0006] Therefore, there is an urgent need for a check valve mechanism to solve the above problems. SUMMARY

[0007] The purpose of the present application is to provide a check valve mechanism that can reduce energy consumption, reduce use cost, and improve installation efficiency.

[0008] To achieve this purpose, the present application adopts the following technical solutions:

[0009] A check valve mechanism, comprising:

[0010] A pump body assembly having a mounting cavity therein, and a first inlet and outlet and an adjusting hole being arranged at the two ends of the mounting cavity in the axial direction and being in communication with the mounting cavity, and a sealing surface being formed in the mounting cavity;

[0011] An adjusting rod, one end of the adjusting rod being adjustably arranged in the adjusting hole, and the adjusting rod having a first channel and a second inlet and outlet being in communication with the first channel;

[0012] The check valve mechanism comprises a check valve body, a check valve core and an elastic member, the check valve body is installed in the installation cavity, the check valve core is located between the check valve body and the sealing surface, and one end of the check valve core is slidingly arranged in the check valve body, and the elastic member is arranged between the check valve body and the check valve core.

[0013] Adjusting the depth of the adjusting rod in the adjusting hole can switch the check valve core between a first position away from the sealing surface to connect the first inlet and outlet and the first channel and a second position abutting against the sealing surface to cut off the passage between the first inlet and outlet and the first channel.

[0014] As a preferred scheme of the check valve mechanism provided by the application, the check valve core comprises:

[0015] The check valve core body comprises a sliding part and a blocking part connected with each other, the sliding part is slidingly arranged in the check valve body, and the elastic member is arranged between the check valve body and the sliding part.

[0016] The sealing member is arranged on the blocking part and can be sealingly attached to the sealing surface when the check valve core is in the second position.

[0017] As a preferred scheme of the check valve mechanism provided by the application, the check valve body has a second channel connected with the first inlet and outlet, the sliding part is slidingly arranged in the second channel, the sliding part has a third channel and an oil passing opening connected with the third channel, and an oil passing space is formed between the outer periphery of the blocking part and the cavity wall of the installation cavity.

[0018] When the check valve core is in the first position, the first inlet and outlet, the second channel, the third channel, the oil passing opening, the oil passing space, the first channel and the second inlet and outlet are sequentially connected.

[0019] As a preferred scheme of the check valve mechanism provided by the application, the third channel is provided with a filtering structure.

[0020] As a preferred scheme of the check valve mechanism provided by the application, the number of the oil passing openings is at least two, and each oil passing opening is arranged at intervals along the circumference of the sliding part.

[0021] As a preferred scheme of the check valve mechanism provided by the application, the check valve core body further comprises a limiting claw, the limiting claw is connected to one end of the sliding part away from the blocking part, one end of the check valve body away from the first inlet and outlet is provided with a first limiting step surface, and the limiting claw can be limited to abut on the first limiting step surface to limit the maximum displacement of the check valve core.

[0022] As a preferred scheme of the check valve mechanism provided by the application, the number of the limit clamps is at least two, and each of the limit clamps is arranged along the circumference of the sliding part.

[0023] As a preferred scheme of the check valve mechanism provided by the application, one end of the limit clamp away from the sliding part is provided with a guide slope, and the guide slope gradually inclines towards the sliding part from inside to outside.

[0024] As a preferred scheme of the check valve mechanism provided by the application, the adjusting rod is screw-connected to the adjusting hole.

[0025] As a preferred scheme of the check valve mechanism provided by the application, the pump body assembly comprises:

[0026] a pump body, the pump body is provided with a stepped hole penetrating along the height direction of the pump body, the opening of the small-diameter section of the stepped hole forms the first inlet and outlet, and the opening of the large-diameter section of the stepped hole forms a mounting port;

[0027] a pump cover mounted at the mounting port, a mounting cavity is formed between the inner end face of the pump cover and the hole wall of the large-diameter section, the inner end face of the pump cover forms the sealing surface, and the adjusting hole penetrates the pump cover along the height direction of the pump body.

[0028] The application has the following beneficial effects:

[0029] The check valve mechanism provided by the application can realize the switching of the check valve core between the first position and the second position by adjusting the depth of the adjusting rod in the adjusting hole, thereby realizing the connection and interruption of the oil circuit, reducing the fluid kinetic energy loss, reducing the energy consumption and use cost, and not relying on the fluid pressure. In use, the first inlet and outlet and the second inlet and outlet can be used as the fluid inlet and outlet respectively, so that the operator does not need to consider the installation direction when installing the check valve mechanism, which can greatly improve the installation efficiency and reduce the labor cost. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a structural schematic view of the check valve mechanism provided by the embodiment of the application;

[0031] Figure 2 is a sectional view of the check valve mechanism provided by the embodiment of the application;

[0032] Figure 3 is Figure 2 is a local enlarged view at A;

[0033] Figure 4 is a structural schematic view of the check valve core provided by the embodiment of the application;

[0034] Figure 5 Figure 1 is a structural schematic diagram of a filter structure provided by an embodiment of the present application.

[0035] In the figure:

[0036] 10, pump body assembly; 11, pump body; 110, mounting cavity; 111, first inlet and outlet; 112, mounting port; 12, pump cover; 120, adjusting hole; 121, sealing surface;

[0037] 20, adjusting rod; 201, first channel; 202, second inlet and outlet;

[0038] 30, check valve assembly; 31, check valve body; 310, second channel; 311, first limiting step surface; 32, check valve core; 321, core body; 3211, sliding part; 32110, third channel; 32111, oil passage; 3212, blocking part; 32120, mounting groove; 3213, limiting clamping jaw; 32131, guide inclined surface; 322, sealing element; 33, elastic element;

[0039] 40, filter structure; 41, annular frame; 42, filter screen. DETAILED DESCRIPTION

[0040] Embodiments of the present application are described in detail below with reference to the accompanying drawings, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar parts or parts having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application, and should not be understood as limiting the present application.

[0041] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, can be fixedly connected, can be detachably connected, can be mechanically connected, can be electrically connected, can be directly connected, can be indirectly connected through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] In the description of the present application, unless otherwise explicitly specified and limited, "on" or "under" of a first feature to a second feature can include that the first feature and the second feature are in direct contact, or that the first feature and the second feature are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "over" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. "Under", "below" and "underneath" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0043] Figure 1 A structural schematic diagram of the check valve mechanism provided by the embodiment is shown. Figure 2 A sectional view schematic diagram of the check valve mechanism provided by the embodiment is shown. Figure 3 A sectional view schematic diagram of the check valve mechanism provided by the embodiment is shown. Figure 2 A local enlarged view at A. As shown in Figures 1-3 The embodiment provides a check valve mechanism, which comprises a pump body assembly 10, an adjusting rod 20 and a check assembly 30. The pump body assembly 10 has a mounting cavity 110 therein. The pump body assembly 10 is provided with a first inlet and outlet 111 and an adjusting hole 120 at two ends of the mounting cavity 110 in the axial direction, and the mounting cavity 110 is formed with a sealing surface 121. One end of the adjusting rod 20 is adjustably arranged in the adjusting hole 120, and the adjusting rod 20 has a first channel 201 and a second inlet and outlet 202 connected with the first channel 201. The check assembly 30 comprises a check valve body 31, a check valve core 32 and an elastic member 33. The check valve body 31 is installed in the mounting cavity 110, the check valve core 32 is located between the check valve body 31 and the sealing surface 121, one end of the check valve core 32 is slidingly arranged in the check valve body 31, and the elastic member 33 is arranged between the check valve body 31 and the check valve core 32. Adjusting the depth of the adjusting rod 20 in the adjusting hole 120 can switch the check valve core 32 between a first position away from the sealing surface 121 to connect the first inlet and outlet 111 and the first channel 201, and a second position abutting against the sealing surface 121 to cut off the passage between the first inlet and outlet 111 and the first channel 201.

[0044] The check valve mechanism provided by the embodiment can realize switching of the check valve core 32 between the first position and the second position by adjusting the depth of the adjusting rod 20 in the adjusting hole 120, thereby realizing the communication and interruption of the oil passage, without relying on fluid pressure, and reducing fluid kinetic energy loss, energy consumption and use cost. In use, the first inlet and outlet 111 and the second inlet and outlet 202 can be used as fluid inlets and fluid outlets respectively, so that the operator does not need to consider the installation direction when installing the check valve mechanism, thereby greatly improving the installation efficiency and reducing the labor cost.

[0045] It should be noted that the check valve mechanism provided by the embodiment is mainly applied to the automobile fuel supply system. When the adjusting rod 20 is tightened, the oil passage is opened; when the adjusting rod 20 is loosened, the oil passage is interrupted, thereby playing a check valve function, which can effectively prevent oil or other flammable media in the oil passage from leaking to the surrounding environment after the oil pipe is disassembled, thereby causing environmental pollution and other dangers. In addition, when the oil passage is opened, the oil flow reaches the maximum and is not affected by the oil pressure, thereby not affecting the normal flow of the oil passage; at the same time, the risk of damage to the oil pump caused by insufficient or no pre-filling of oil after the check valve mechanism is installed behind the engine is effectively prevented, thereby improving the use safety of the vehicle.

[0046] In some embodiments, the pump body assembly 10 includes a pump body 11 and a pump cover 12. The pump body 11 is provided with a stepped hole penetrating in the height direction thereof. The opening of the small-diameter section of the stepped hole forms the first inlet and outlet 111, and the opening of the large-diameter section of the stepped hole forms the mounting port 112. The pump cover 12 is connected to the mounting port 112, and the inner end surface of the pump cover 12 and the hole wall of the large-diameter section of the stepped hole form the mounting cavity 110. The inner end surface of the pump cover 12 forms the sealing surface 121, and the adjusting hole 120 penetrates the pump cover 12 in the height direction of the pump body 11. Through the stepped hole on the pump body 11, the stepped surface formed between the large-diameter section and the small-diameter section of the stepped hole can provide a limit for the installation of the check valve assembly 30, so as to ensure the accurate installation between the check valve assembly 30 and the pump body assembly 10 and improve the stability of the installation therebetween.

[0047] It should be noted that the height direction of the pump body 11 is the axial direction of the mounting cavity 110, and the inner end surface of the pump cover 12 refers to the end surface of the pump cover 12 on the side of the pump body 11.

[0048] In some embodiments, the pump cover 12 is threadedly connected to the mounting port 112, so as to realize the fixed connection between the pump cover 12 and the pump body 11. The threaded connection has the advantages of simple structure, tight connection and convenient disassembly and assembly.

[0049] In some embodiments, the adjusting rod 20 is screwed to the adjusting hole 120, and the operator can adjust the depth of the adjusting rod 20 in the adjusting hole 120 by screwing the adjusting rod 20, which is convenient and fast. Alternatively, the adjusting rod 20 can be directly selected as a hollow screw, which is convenient to install and can reduce the processing cost.

[0050] Figure 4 A structural schematic diagram of the check valve core 32 provided by the present embodiment is shown. As shown in Figure 4 In combination with Figure 3 As shown, the check valve core 32 includes a core body 321 and a sealing member 322. The core body 321 includes a sliding part 3211 and a blocking part 3212 connected with each other. The sliding part 3211 is slidingly arranged in the check valve body 31, and the elastic member 33 is arranged between the check valve body 31 and the sliding part 3211. The sealing member 322 is arranged on the blocking part 3212 and can be sealingly attached to the sealing surface 121 when the check valve core 32 is in the second position. By arranging the sealing member 322, the sealing effect between the check valve core 32 and the sealing surface 121 when the check valve core 32 is in the second position can be improved.

[0051] In some embodiments, the blocking part 3212 is provided with a mounting groove 32120 for mounting the sealing member 322, so as to stably mount the sealing member 322 and avoid its falling off or displacement during use.

[0052] In the present embodiment, the blocking part 3212 includes a first part and a second part connected with each other. The first part is connected with the sliding part 3211, and the mounting groove 32120 is located between the first part and the second part. The outer diameter of the first part is greater than the outer diameter of the sealing member 322, and the outer diameter of the second part is smaller than the inner diameter of the adjusting hole 120. When the check valve core 32 is in the second position, the second part can extend into the adjusting hole 120 and press the sealing member 322 against the sealing surface 121 under the elastic action of the elastic member 33. By arranging the outer diameter of the first part to be greater than the outer diameter of the sealing member 322, it can be ensured that the sealing member 322 is completely attached to the sealing surface 121, the sealing area between the sealing member 322 and the sealing surface 121 is increased, and the sealing effect is improved.

[0053] In some embodiments, the sealing member 322 is a rubber sealing ring, which has good sealing effect, is convenient to install, and has low cost.

[0054] As Figures 2-4As shown, the check valve body 31 has a second channel 310 communicated with the first inlet and outlet 111, and a sliding part 3211 is slidingly arranged in the second channel 310, and the sliding part 3211 has a third channel 32110 and an oil passing opening 32111 communicated with the third channel 32110, and an oil passing space is formed between the outer periphery of the blocking part 3212 and the cavity wall of the mounting cavity 110; when the check valve core 32 is in the first position, the first inlet and outlet 111, the second channel 310, the third channel 32110, the oil passing opening 32111, the oil passing space, the first channel 201 and the second inlet and outlet 202 are sequentially communicated. That is, when the check valve core 32 is in the first position, the oil passes through the interior of the check valve body 31 and the interior of the check valve core 32, and no interval for the oil to pass through is required to be left between the outer periphery of the check valve body 31 and the cavity wall of the mounting cavity 110 to ensure the smoothness of the oil flow, and the stable installation of the check assembly 30 can be ensured, and displacement or overturning of the check assembly 30 under the flow impact of the oil can be avoided.

[0055] In some embodiments, the check valve body 31 is interference-fitted in the mounting cavity 110. During installation, the check assembly 30 is only required to be loaded into the mounting cavity 110 from the mounting opening 112 of the pump body 11, and then the pump cover 12 is installed at the mounting opening 112, without the need of using additional connecting structures, which can improve the assembly efficiency and reduce the processing cost.

[0056] In some embodiments, the number of the oil passing openings 32111 is at least two, and each oil passing opening 32111 is arranged in the circumferential direction of the sliding part 3211. Through the arrangement of the at least two oil passing openings 32111, the oil flow area can be increased, so that the oil flowing into the third channel 32110 can smoothly flow out of the oil passing opening 32111, and the influence of the oil flow rate caused by the too small flow area of the oil passing opening 32111 can be avoided.

[0057] Figure 5 A structure diagram of the filter structure 40 provided in the embodiment is shown. As shown in the figure, Figure 5 and combined with Figure 3 As shown, the filter structure 40 is arranged in the third channel 32110. The arrangement of the filter structure 40 can filter the oil passing therethrough, avoid the impurities in the oil flowing into the downstream oil injection nozzle, fuel guide rail and other components, cause poor oil injection atomization, power drop, oil consumption increase and other conditions, and effectively prevent the impurities from invading during multiple disassembly and maintenance, and protect the cleanliness of the oil in the fuel supply system.

[0058] In some embodiments, the filter structure 40 includes an annular frame 41 and a filter screen 42, the annular frame 41 is installed in the third channel 32110 of the check valve core 32, the annular frame 41 has a plurality of hollow parts arranged in the circumferential direction thereof, and the filter screen 42 is arranged on the annular frame 41.

[0059] In some embodiments, the filter screen 42 is annular and is mounted on the inner side of the annular frame 41 to cover all the hollow parts, which can improve the installation efficiency and ensure the installation stability of the filter screen 42 on the annular frame 41. In other embodiments, a plurality of filter screens 42 corresponding to the hollow parts can be provided, and each filter screen 42 is mounted at the corresponding hollow part. This design can reduce the material of the filter screen 42 and reduce the material cost.

[0060] In some embodiments, the annular frame 41 is a plastic frame, which has a lighter weight and a higher strength, can realize the lightweight design of the check valve mechanism, and can reduce the processing cost.

[0061] In some embodiments, the annular frame 41 is installed in the third channel 32110, and no additional connecting structure is needed, which can improve the assembly efficiency and reduce the processing cost.

[0062] In some embodiments, the filter screen 42 is a metal filter screen, which has a higher structural strength, a higher filtering precision, and a longer service life.

[0063] As shown in Figures 3-4 The valve core body 321 further includes a limiting claw 3213 connected to one end of the sliding part 3211 away from the plugging part 3212. The end of the check valve body 31 away from the first inlet and outlet 111 is provided with a first limiting step surface 311, and the limiting claw 3213 can be limited to abut on the first limiting step surface 311 to limit the maximum displacement of the check valve core 32, so as to avoid the check valve core 32 from being pulled out of the check valve body 31.

[0064] In some embodiments, the number of limiting claws 3213 is at least two, and each limiting claw 3213 is arranged at intervals along the circumference of the sliding part 3211. With this arrangement, the space between the two adjacent limiting claws 3213 can provide a deformation space for the limiting claw 3213, thereby facilitating the assembly between the check valve core 32 and the check valve body 31. Alternatively, the check valve core 32 is made of plastic material and has a certain deformation elasticity, and the material cost is relatively low.

[0065] In some embodiments, the end of the limiting claw 3213 away from the sliding part 3211 is provided with a guide inclined surface 32131, which gradually inclines towards the sliding part 3211 from the inside to the outside. The provision of the guide inclined surface 32131 can provide a guide for the assembly between the check valve core 32 and the check valve body 31, thereby improving the convenience of the assembly therebetween.

[0066] Continuing as Figure 3As shown, the inner side of the connection position of the sliding part 3211 and the limiting clamping jaw 3213 is provided with a second limiting step surface, the inner side of the check valve body 31 close to the one end of the first inlet and outlet 111 is provided with a third limiting step surface, the elastic member 33 is limitedly installed between the second limiting step surface and the third limiting step surface, so that the elastic member 33 is located in the limiting space formed by the limiting clamping jaw 3213, the installation stability of the elastic member 33 is improved, and the elastic member 33 can be limited in extension and contraction, so as to avoid the elastic member 33 extending and contracting in the direction deviating from the axis, and affecting the uniform fitting of the sealing member 322 and the sealing surface 121.

[0067] In some embodiments, the elastic member 33 is a spring, which is convenient for assembly and has low processing cost.

[0068] In some embodiments, the sliding part 3211, the plugging part 3212 and the limiting clamping jaw 3213 are integrally formed, so as to reduce the number of parts, simplify the assembly process and improve the processing efficiency.

[0069] Obviously, the above embodiments of the application are only examples for clear illustration of the application, and are not intended to limit the embodiments of the application. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments are not required to be exhausted. Any modification, equivalent replacement and improvement within the spirit and principle of the application shall be included in the protection scope of the claims of the application.

Claims

1. A check valve mechanism characterized by, include: The pump body assembly (10) has a mounting cavity (110) therein, and the pump body assembly (10) is provided with a first inlet and outlet (111) and an adjustment hole (120) communicating with the mounting cavity (110) at both ends along the axial direction of the mounting cavity (110), and a sealing surface (121) is formed in the mounting cavity (110). An adjusting rod (20) is provided, one end of which is adjustablely inserted into the adjusting hole (120), and the adjusting rod (20) has a first channel (201) and a second inlet / outlet (202) connected to the first channel (201). The check valve assembly (30) includes a check valve body (31), a check valve core (32), and an elastic element (33). The check valve body (31) is installed in the mounting cavity (110). The check valve core (32) is located between the check valve body (31) and the sealing surface (121), and one end of the check valve core (32) is slidably disposed in the check valve body (31). The elastic element (33) is disposed between the check valve body (31) and the check valve core (32). Adjusting the depth of the adjusting rod (20) in the adjusting hole (120) allows the check valve core (32) to switch between a first position away from the sealing surface (121) to connect the first inlet / outlet (111) and the first channel (201) and a second position against the sealing surface (121) to cut off the passage between the first inlet / outlet (111) and the first channel (201).

2. The check valve mechanism of claim 1, wherein The check valve core (32) includes: The valve core body (321) includes a sliding part (3211) and a blocking part (3212) connected to each other. The sliding part (3211) is slidably disposed in the check valve body (31), and the elastic element (33) is disposed between the check valve body (31) and the sliding part (3211). A sealing element (322) is disposed on the sealing part (3212) and can seal against the sealing surface (121) when the check valve core (32) is in the second position.

3. The check valve mechanism of claim 2, wherein, The check valve body (31) has a second channel (310) connected to the first inlet and outlet (111), the sliding part (3211) is slidably disposed in the second channel (310), and the sliding part (3211) has a third channel (32110) and an oil passage (32111) connected to the third channel (32110). An oil passage space is formed between the outer periphery of the sealing part (3212) and the cavity wall of the mounting cavity (110). When the check valve core (32) is in the first position, the first inlet / outlet (111), the second channel (310), the third channel (32110), the oil port (32111), the oil space, the first channel (201), and the second inlet / outlet (202) are connected in sequence.

4. The check valve mechanism of claim 3, wherein The third channel (32110) is equipped with a filter structure (40).

5. The check valve mechanism of claim 3, wherein The number of the oil passing ports (32111) is at least two, and each of the oil passing ports (32111) is arranged at intervals along the circumference of the sliding part (3211).

6. The check valve mechanism of claim 2, wherein The valve core body (321) further comprises a limiting claw (3213) connected to one end of the sliding part (3211) away from the blocking part (3212), and the check valve body (31) is provided with a first limiting step surface (311) at one end away from the first inlet and outlet (111), and the limiting claw (3213) can be limited to abut against the first limiting step surface (311) to limit the maximum displacement of the check valve core (32).

7. The check valve mechanism of claim 6, wherein, The number of the limiting claws (3213) is at least two, and each of the limiting claws (3213) is arranged at intervals along the circumference of the sliding part (3211).

8. The check valve mechanism of claim 6, wherein, One end of the limiting claw (3213) away from the sliding part (3211) is provided with a guide inclined surface (32131) which is gradually inclined towards the sliding part (3211) from inside to outside.

9. The check valve mechanism of any one of claims 1-8, wherein, The adjusting rod (20) is threadedly connected to the adjusting hole (120).

10. The check valve mechanism of any one of claims 1-8, wherein, The pump body assembly (10) comprises: A pump body (11) provided with a stepped hole penetrating along the height direction thereof, the opening of the small-diameter section of the stepped hole forms the first inlet and outlet (111), and the opening of the large-diameter section of the stepped hole forms a mounting port (112); A pump cover (12) mounted at the mounting port (112), and a mounting cavity (110) is formed between the inner end surface of the pump cover (12) and the hole wall of the large-diameter section, the inner end surface of the pump cover (12) forms the sealing surface (121), and the adjusting hole (120) is arranged penetrating through the pump cover (12) along the height direction of the pump body (11).

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