A pump housing

Abstract

The application relates to a pump shell, which comprises a top wall and a peripheral wall, the top wall is horizontally arranged, the peripheral wall is vertically arranged, the upper edge of the peripheral wall is connected with the outer edge of the top wall, the lower side of the peripheral wall forms an opening, and a liquid inlet is arranged on the top wall; a mounting port is arranged on the peripheral wall, a mounting structure is connected at the mounting port, and a one-way valve flap is mounted on the mounting structure. The application is applied to an inverted pump, in the opening and closing process of the one-way valve flap, at most, emulsion can only enter into an annular chamber, and the emulsion in the annular chamber can be squeezed into an emulsion bottle again, so that the situation of liquid leakage is prevented.

Description

Technical Field

[0001] This application belongs to the field of inverted pump technology, specifically relating to a pump casing. Background Technology

[0002] In some applications, lotion bottles need to be used upside down. In this case, a suitable inverting pump needs to be matched with the bottle opening. When using it, the lotion is sprayed out by pressing the nozzle of the inverting pump upward. As the lotion is sprayed out, air needs to be introduced into the lotion bottle. Currently, the air introduction method is mostly to set an air port on the inverting pump, but there is a problem that the lotion will flow out from the air port.

[0003] The prior art US2017 / 0181584A1 discloses an exhaust liquid distributor that uses a one-way valve at the air inlet to solve the problem of emulsion leakage. However, in practical applications, when the pressure inside the emulsion bottle decreases, the external atmospheric pressure opens the one-way valve, causing the edge of the one-way valve to fold inward into the emulsion bottle, thus forming a small opening at the edge of the one-way valve. Air enters the emulsion bottle through this small opening, increasing the pressure inside the bottle. This causes the one-way valve to return to its original position, thus closing the air inlet and preventing emulsion leakage. However, because the edge of the one-way valve folds inward, the outer side of the edge is also submerged in the emulsion from the bottle. Therefore, when the one-way valve closes the air inlet again, the edge of the one-way valve carries some emulsion into the air inlet, which can lead to leakage at the air inlet over time. Summary of the Invention

[0004] In view of this, this application provides a pump housing for use in an inverted pump, in which the emulsion will at most enter the annular chamber during the opening and closing of the one-way valve, and the emulsion in the annular chamber can be squeezed back into the emulsion bottle to prevent leakage.

[0005] The technical solution adopted in this application is as follows:

[0006] A pump housing for an inverted pump includes a top wall and a peripheral wall, the top wall being horizontally arranged and the peripheral wall being vertically arranged, the upper edge of the peripheral wall being connected to the outer edge of the top wall, an opening being formed on the lower side of the peripheral wall, and a liquid inlet being provided on the top wall;

[0007] The peripheral wall is provided with an installation port, and an installation structure is connected to the installation port. The installation structure includes a first shell, a second shell, and a bottom wall arranged coaxially. The first shell and the second shell are both cylindrical. The outer diameter of the first shell is smaller than the inner diameter of the second shell. The first shell is located radially inside the second shell. The first end of the first shell is flush with the first end of the second shell, and both the first end of the first shell and the first end of the second shell are connected to the bottom wall. The second end of the second shell is sealed to the installation port. The length of the first shell is smaller than the length of the second shell, so that the second end of the first shell is located inside the second shell. An annular cavity is formed between the first shell and the second shell.

[0008] The mounting structure is equipped with a one-way valve disc, which includes a plug-in part and a leaflet. The leaflet is conical, and the top of the leaflet is connected to the plug-in part. The plug-in part is inserted into the second end of the first shell. The outer peripheral surface of the leaflet is in contact with the inner wall of the second shell and seals the annular cavity.

[0009] The axis of the second shell is inclined, and the height of the first end of the second shell is higher than the height of the second end of the second shell;

[0010] The second shell and / or the bottom wall are provided with air holes. The annular cavity is connected to the interior of the peripheral wall through the air holes. The position of the air holes is higher than the reference surface. The reference surface is determined by an auxiliary line and an axis. The axis is the axis of the second shell. The auxiliary line is a horizontal straight line and is perpendicular to the axis.

[0011] Preferably, the angle between the axis and the horizontal plane is 5°-10°.

[0012] Preferably, a positioning block is provided on the inner wall of the first shell, and a positioning groove is provided on the insertion part, wherein the positioning block cooperates with the positioning groove;

[0013] The leaflet includes a connecting part, a leaflet, and a reinforcing block. The connecting part is circular, the leaflet is frustoconical, and the connecting part closes the top opening of the leaflet. The reinforcing block is a right trapezoid, with its upper base connected to the connecting part and its hypotenuse connected to the inner surface of the leaflet. Along the axial direction of the connecting part, the connecting part is divided into a fan-shaped opening and closing area and a fan-shaped reinforcing area. The angle of the opening and closing area is less than 180°. There are multiple reinforcing blocks, which are connected to and evenly distributed on the reinforcing area.

[0014] When the positioning groove engages with the positioning block, the opening / closing area faces downwards.

[0015] Preferably, the length of the upper bottom of the reinforcing block is 1 / 3 to 2 / 3 of the radius of the connecting part.

[0016] Preferably, the length of the inclined side of the reinforcing block is 2 / 3 to 3 / 4 of the length of the generatrix of the petal.

[0017] Preferably, the angle of the opening and closing area is 90°-150°.

[0018] Preferably, the inner wall of the first shell is provided with an annular groove, and the outer periphery of the insertion part is provided with an annular retaining strip, which cooperates with the groove.

[0019] Preferably, the second shell includes a large-diameter section and a small-diameter section connected to each other, the inner diameter of the large-diameter section is larger than the inner diameter of the small-diameter section, the large-diameter section is farther away from the first end of the second shell than the small-diameter section, a first step structure is formed between the large-diameter section and the small-diameter section, and the length of the small-diameter section is greater than the length of the first shell;

[0020] The outer surface of the petal is provided with a second step structure, which cooperates with the first step structure.

[0021] Preferably, the inclined portion of the reinforcing block covers the second step structure.

[0022] Preferably, the inverted pump is an inverted foam pump or an inverted emulsion pump.

[0023] The beneficial effects of this application are:

[0024] The pump housing of this application is used in an inverted pump, which is used in conjunction with a lotion bottle. During use, the lotion in the bottle completely covers the top and sides. After pressing the inverted pump to pump the lotion out, the pressure inside the bottle decreases. One side of the one-way valve is connected to the outside through an air vent, while the other side is connected to the inside of the lotion bottle. When the pressure inside the bottle is lower than atmospheric pressure, atmospheric pressure pushes open the valve leaf, causing the outer edge of the leaf to fold towards the inside of the bottle, forming a small opening through which air can enter the bottle. When the pressure inside the bottle reaches atmospheric pressure, the valve leaf... Resealing the small opening allows some emulsion to enter the annular cavity. This portion of emulsion flows downwards under gravity. Due to the inclined design of the second shell and the relatively high position of the vent, the emulsion does not enter the vent. The emulsion eventually converges at the lowest point of the annular cavity. When the pressure inside the emulsion bottle drops below atmospheric pressure, the valve at the lowest point reopens, squeezing the emulsion that has converged at the lowest point back into the emulsion bottle. This prevents excessive emulsion accumulation in the annular cavity and avoids emulsion leakage through the vent, thus solving the problem of emulsion leakage when using an inverted pump. Attached Figure Description

[0025] The above and other objects, features, and advantages of this application will become clearer from the following description of embodiments with reference to the accompanying drawings, in which:

[0026] Figure 1 This is a schematic diagram of the pump casing of an inverted emulsion pump;

[0027] Figure 2 yes Figure 1 Cross-sectional view of the pump casing;

[0028] Figure 3 yes Figure 1 Another sectional view of the pump casing;

[0029] Figure 4 This illustrates the accumulation of emulsion within the annular chamber;

[0030] Figure 5 This is a schematic diagram of the structure of a one-way valve disc;

[0031] Figure 6 This is a schematic diagram of the one-way valve disc from another perspective;

[0032] Figure 7 This is a schematic diagram of the pump casing of an inverted foam pump;

[0033] Figure 8 yes Figure 7 Cross-sectional view of the pump casing.

[0034] In the diagram: 1. Top wall; 2. Peripheral wall; 3. One-way valve disc; 4. Installation structure.

[0035] 11. Liquid inlet; 12. Mounting port; 13. Straight wall;

[0036] 31. Insertion point; 32. Leaflet;

[0037] 41. First shell; 42. Second shell; 43. Slot; 44. Annular chamber; 45. Positioning block; 46. First step structure; 47. Air hole; 48. Bottom wall;

[0038] 311. Positioning groove; 312. Locking strip; 321. Connecting part; 322. Flap; 323. Reinforcing block; 324. Second step structure. Detailed Implementation

[0039] The present application is described below based on embodiments, but the present application is not limited to these embodiments. In the following detailed description of the present application, some specific details are described in detail, but well-known methods, processes, flows, and elements are not described in detail in order to avoid obscuring the substance of the present application.

[0040] Furthermore, those skilled in the art should understand that the accompanying drawings provided herein are for illustrative purposes only and are not necessarily drawn to scale.

[0041] Unless the context explicitly requires it, the words "comprising," "including," and similar terms throughout the specification and claims should be interpreted as encompassing rather than being exclusive or exhaustive; that is, meaning "including but not limited to."

[0042] In the description of this application, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0043] See Figures 1-8 This application relates to a pump housing for use in an inverted pump. The inverted pump is used in an inverted lotion bottle (with the opening of the lotion bottle facing downwards). The inverted pump can spray out lotion (such as hand soap, shower gel, shampoo, etc.) from the lotion bottle. The pump housing includes a top wall 1 and a peripheral wall 2. The top wall 1 is horizontally arranged, and the peripheral wall 2 is vertically arranged. The upper edge of the peripheral wall 2 is connected to the outer edge of the top wall 1. An opening is formed on the lower side of the peripheral wall 2. The top wall 1 is provided with a liquid inlet 11.

[0044] The peripheral wall 2 is provided with an installation port 12, and an installation structure 4 is connected to the installation port 12. The installation structure 4 includes a first shell 41, a second shell 42 and a bottom wall 48 arranged coaxially. The first shell 41 and the second shell 42 are both cylindrical. The outer diameter of the first shell 41 is smaller than the inner diameter of the second shell 42. The first shell 41 is located radially inside the second shell 42. The first end of the first shell 41 is flush with the first end of the second shell 42, and the first ends of the first shell 41 and the second shell 42 are both connected to the bottom wall 48. The second end of the second shell 42 is sealed to the installation port 12. The length of the first shell 41 is smaller than the length of the second shell 42, so that the second end of the first shell 41 is located inside the second shell 42. An annular cavity 44 is formed between the first shell 41 and the second shell 42.

[0045] The mounting structure 4 is equipped with a one-way valve disc 3, which includes a plug-in part 31 and a leaflet 32. The leaflet 32 ​​is conical, and the top of the leaflet 32 ​​is connected to the plug-in part 31. The plug-in part 31 is inserted into the second end of the first shell 41. The outer peripheral surface of the leaflet 32 ​​is in contact with the inner wall of the second shell 42 and seals the annular chamber 44.

[0046] The axis of the second shell 42 is inclined, and the height of the first end of the second shell 42 is higher than the height of the second end of the second shell 42.

[0047] The second shell 42 ( Figure 3 (as shown in the embodiment) and / or the bottom wall 48 ( Figure 8 The embodiment shown has an air hole 47. The annular cavity is connected to the interior of the peripheral wall 2 through the air hole 47. The position of the air hole 47 is higher than the reference surface. The reference surface is determined by an auxiliary line and an axis. The axis is the axis of the second shell 42. The auxiliary line is a horizontal straight line and is perpendicular to the axis.

[0048] When the pump housing is applied to an inverted pump, and the inverted pump is installed inside the mouth of the emulsion bottle, the pump housing extends to the bottle mouth. Since the emulsion bottle contains emulsion, the emulsion completely covers the upper surface of the top wall 1 and the outer circumference of the peripheral wall 2. After pressing the inverted pump to pump the emulsion out of the bottle, the pressure inside the bottle decreases. One side of the one-way valve 3 (the side facing away from the emulsion bottle) communicates with the outside through the vent 47, while the other side of the one-way valve 3 (the side facing the emulsion bottle) communicates with the inside of the emulsion bottle. When the pressure inside the emulsion bottle is lower than atmospheric pressure, atmospheric pressure will push open the valve leaf 32, causing the outer edge of the valve leaf 32 to fold towards the inside of the emulsion bottle, thus forming a small opening (allowing the annular chamber 44 to communicate with the inside of the emulsion bottle through this small opening). Air can then enter the emulsion bottle through this small opening. Because the outer edge of the leaflet 32 ​​is folded over, the outer side of the leaflet 32 ​​will also come into contact with the emulsion in the emulsion bottle, causing a certain amount of emulsion to adhere to the outer side of the leaflet 32. When the pressure in the emulsion bottle reaches atmospheric pressure, the leaflet 32 ​​will reclose the small opening, and the leaflet 32 ​​will carry a portion of the emulsion (the portion of emulsion adhered to the outer side of the leaflet 32) into the annular chamber 44. Since the mounting port 12 is located on the peripheral wall 2, the mounting port 12 is basically in a vertical state, that is, the leaflet 32 ​​is also basically in a vertical state. Therefore, the emulsion on the outer side of the leaflet 32 ​​will flow downward along the leaflet 32 ​​under the action of gravity, and flow to the lowest position of the leaflet 32. At the same time, the second shell 42 is inclined, and its first end is higher than its second end, that is, as Figure 4 In the illustrated embodiment, the left side of the second shell 42 is higher than the right side. Therefore, within the annular chamber 44, the emulsion eventually converges at the lower right corner of the annular chamber 44 and contacts the lower (outer) part of the leaflet 32. Consequently, when a low pressure is formed again inside the emulsion bottle (the pressure inside the emulsion bottle is lower than atmospheric pressure), the outer edge of the leaflet 32 ​​folds back towards the inside of the emulsion bottle, and the lower part of the leaflet 32 ​​also folds inward. Thus, this portion of the emulsion in the annular chamber 44 is squeezed into the emulsion bottle under atmospheric pressure, thereby ensuring that the emulsion does not accumulate in the annular chamber 44 and solving the problem of emulsion leakage.

[0049] The pore 47 is located on the upper side of the reference surface, so that the pore 47 is located in the upper part of the annular chamber 44, thereby ensuring that the pore 47 is away from the lower part of the annular chamber 44, especially away from the lower right corner of the annular chamber 44 (the location where the emulsion gathers), ensuring that the emulsion does not enter the pore 47.

[0050] Furthermore, the high position of the vent 47 allows the annular chamber 44 (i.e., the buffer space below the vent 47) to have a larger volume, enabling the annular chamber 44 to hold a larger amount of emulsion and providing a certain buffer space for emulsion storage. Even if the lower part of the leaflet 32 ​​cannot be folded inward, the emulsion will not immediately flow out of the vent 47, but will only enter the vent 47 after the buffer space is full. Since the inverted pump is a disposable product and the amount of emulsion in the emulsion bottle is relatively limited, the emulsion will basically not fill the buffer space during the entire service life of the emulsion bottle, thus preventing the problem of emulsion leakage.

[0051] The angle between the axis and the horizontal plane is 5°-10°. That is, the angle between the reference plane and the horizontal plane is 5°-10°, for example, 5°, 6°, 8° or 10°. This small angle ensures that the axis is basically horizontal, thereby ensuring that the leaflet 32 ​​is basically vertical, ensuring that the emulsion converges to the lower right part of the annular chamber 44, and ensuring that the emulsion does not flow to the left.

[0052] The inner wall of the first shell 41 is provided with a positioning block 45, and the insertion part 31 is provided with a positioning groove 311, and the positioning block 45 cooperates with the positioning groove 311.

[0053] The leaflet 32 ​​includes a connecting portion 321, a leaflet 322, and a reinforcing block 323. The connecting portion 321 is circular, and the leaflet 322 is frustoconical. The connecting portion 321 closes the top opening of the leaflet 322. The reinforcing block 323 is a right trapezoid. The upper base of the reinforcing block 323 is connected to the connecting portion 321, and the hypotenuse of the reinforcing block 323 is connected to the inner surface of the leaflet 322. Along the axial direction of the connecting portion 321, the connecting portion 321 is divided into a fan-shaped opening and closing area and a fan-shaped reinforcing area. The angle of the opening and closing area is less than 180°. There are multiple reinforcing blocks 323, which are connected to the reinforcing area and are evenly distributed on the reinforcing area.

[0054] When the positioning groove 311 engages with the positioning block 45, the opening and closing area faces downward.

[0055] The positioning block 45 and positioning groove 311 ensure that the one-way valve disc 3 can only be installed onto the first housing 41 at a unique angle. The disc leaf 32 is connected to the insertion part 31 via its connecting part 321. The reinforcing block 323 strengthens the local structure of the disc leaf 32, making this part of the disc 322 less prone to folding over. The reinforcing block 323 is connected to the reinforcing area, but there is no reinforcing block 323 in the opening and closing area. This means that the disc leaf 322 in the opening and closing area is more likely to fold inward under external pressure than the disc leaf 322 in the reinforcing area. The positioning groove 311 and positioning block 45 ensure that the opening and closing area faces downward. Therefore, the emulsion ultimately accumulates in the disc leaf 322 in the opening and closing area. Thus, when the pressure inside the emulsion bottle decreases, the disc leaf 322 in the opening and closing area preferentially folds inward, allowing the emulsion accumulated in the lower right part to be squeezed into the emulsion bottle.

[0056] The opening and closing area has an angle of less than 180° and faces downwards, so that when the buffer space is filled with emulsion, the emulsion will completely cover the outer edge of the opening and closing area (petal 322). Therefore, even if the two ends of the outer edge of the opening and closing area are folded inwards, it will ensure that the emulsion can be squeezed into the emulsion bottle, preventing the emulsion from completely filling the buffer space and preventing emulsion leakage.

[0057] The length of the upper base of the reinforcing block 323 is 1 / 3 to 2 / 3 of the radius of the connecting part 321. The upper base (for a right trapezoid) is the shorter side of the reinforcing block 323 and is also the side directly connected to the connecting part 321. The length of the upper base is 1 / 3 to 2 / 3 of the radius of the connecting part 321, making the length of the upper base less than the radius of the connecting part 321. The length direction of the upper base extends radially along the connecting part 321, so there is a certain distance between the radial inner side of the upper base and the center of the connecting part 321. This prevents the reinforcing blocks 323 from connecting together (the thickness of the reinforcing blocks 323 is small), and allows the petals 322 in the reinforcing area to fold inward as well. This ensures that when the pressure inside the emulsion bottle is too low, the outer edge of the entire petal 322 can fold inward, thereby increasing the rate of air circulation in the emulsion bottle.

[0058] The length of the hypotenuse of the reinforcing block 323 is 2 / 3 to 3 / 4 of the length of the generatrix of the petal 322. The hypotenuse of the reinforcing block 323 (for a right-angled trapezoid) is directly connected to the petal 322. The length of the hypotenuse must not be 2 / 3 to 3 / 4 of the length of the generatrix of the petal 322, ensuring that the reinforcing block 323 does not cover the outer edge of the petal 322. This makes the outer edge of the petal 322 (the radially outer part of the petal 322 from the reinforcing block 323) relatively flexible, allowing the petal 322 to better conform to the inner wall of the second shell 42, thus enabling the one-way valve structure to function as a one-way sealing element of the annular chamber 44.

[0059] Furthermore, under normal circumstances (without pressing the inverted pump), the pressure inside the emulsion bottle is greater than atmospheric pressure. That is, the pressure inside the flap 322 (the side facing the emulsion bottle) is greater than the pressure outside the flap 322 (the side facing the annular chamber 44). At this time, the flap 322 will be subjected to an outward bending force (pressure difference). The reinforcement block 323 can prevent the flap 322 from bending outward, thereby preventing the emulsion inside the emulsion bottle from leaking into the annular chamber 44.

[0060] The angle of the opening and closing area is 90°-150°, for example, 90°, 100°, 110°, 120°, 130°, 140°, or 150°. An angle greater than 90° provides greater strength to the reinforcing blocks 323 in the middle and on both sides of the opening and closing area. This minimizes the impact of the reinforcing blocks 323 on the middle (outer edge) of the opening and closing area, ensuring that the outer edge of the middle of the opening and closing area can fold inward normally, thereby ensuring that air can pass into the emulsion bottle.

[0061] The inner wall of the first housing 41 is provided with an annular groove 43, and the outer periphery of the insertion part 31 is provided with an annular retaining strip 312, which cooperates with the groove 43. The groove 43 and the retaining strip 312 enable the insertion part 31 to engage with the first housing 41, ensuring that the one-way valve disc 3 can be effectively fixed.

[0062] The second shell 42 includes a large-diameter section and a small-diameter section connected to each other. The inner diameter of the large-diameter section is larger than the inner diameter of the small-diameter section. The large-diameter section is farther away from the first end of the second shell 42 than the small-diameter section. A first step structure 46 is formed between the large-diameter section and the small-diameter section. The length of the small-diameter section is greater than the length of the first shell 41, so that the first step structure 46 is located on the right side of the first section.

[0063] The outer surface of the leaflet 32 ​​(petal 322) is provided with a second step structure 324, which cooperates with the first step structure 46.

[0064] The large-diameter section is located on the right side of the small proximal end. Under normal circumstances, the inner side of the leaflet 322 is subjected to the pressure of the emulsion in the emulsion bottle, which causes the outer edge of the leaflet 322 to tend to bend outward, that is, the leaflet 322 tends to bend to the left. The first step structure 46 abuts against the second step structure 324 on the left side of the leaflet 32, thereby preventing the leaflet 322 from bending to the left and preventing the emulsion in the emulsion bottle from leaking into the annular chamber 44.

[0065] The inclined portion of the reinforcing block 323 covers the second step structure 324. This strengthens the structural strength of the second step structure 324, ensuring that the petal 322 will not bend to the left.

[0066] The one-way valve disc 3 of this application can be made entirely of silicone.

[0067] The positioning groove 311 on the plug-in part 31 is not connected to the retaining strip 312 on the plug-in part 31. That is, the positioning groove 311 is located on the left side of the retaining strip 312, so that the positioning groove 311 will not affect the retaining strip 312, ensuring that the one-way valve disc 3 can be effectively fixed.

[0068] Preferably, the peripheral wall 2 may have a vertical, plate-shaped straight wall 13, and the mounting opening 12 is located on the straight wall 13.

[0069] It should be understood that the above-described embodiments are merely exemplary and not restrictive. Any obvious or equivalent modifications or substitutions made by those skilled in the art regarding the above details without departing from the basic principles of this application shall be included within the scope of the claims of this application.

Claims

1. A pump casing for an inverted pump, characterized in that, It includes a top wall and a peripheral wall. The top wall is horizontally arranged, and the peripheral wall is vertically arranged. The upper edge of the peripheral wall is connected to the outer edge of the top wall, and an opening is formed on the lower side of the peripheral wall. The top wall is provided with a liquid inlet. The peripheral wall is provided with an installation port, and an installation structure is connected to the installation port. The installation structure includes a first shell, a second shell, and a bottom wall arranged coaxially. The first shell and the second shell are both cylindrical. The outer diameter of the first shell is smaller than the inner diameter of the second shell. The first shell is located radially inside the second shell. The first end of the first shell is flush with the first end of the second shell, and both the first end of the first shell and the first end of the second shell are connected to the bottom wall. The second end of the second shell is sealed to the installation port. The length of the first shell is smaller than the length of the second shell, so that the second end of the first shell is located inside the second shell. An annular cavity is formed between the first shell and the second shell. The mounting structure is equipped with a one-way valve disc, which includes a plug-in part and a leaflet. The leaflet is conical, and the top of the leaflet is connected to the plug-in part. The plug-in part is inserted into the second end of the first shell. The outer peripheral surface of the leaflet fits against the inner wall of the second shell and seals the annular cavity. The axis of the second shell is inclined, and the height of the first end of the second shell is higher than the height of the second end of the second shell; The second shell and / or the bottom wall are provided with air holes. The annular chamber is connected to the interior of the peripheral wall through the air holes. The position of the air holes is higher than the reference surface. The reference surface is determined by an auxiliary line and an axis. The axis is the axis of the second shell. The auxiliary line is a horizontal straight line and is perpendicular to the axis.

2. The pump casing according to claim 1, characterized in that, The angle between the axis and the horizontal plane is 5°-10°.

3. The pump casing according to claim 1, characterized in that, The inner wall of the first shell is provided with a positioning block, and the insertion part is provided with a positioning groove, and the positioning block cooperates with the positioning groove; The leaflet includes a connecting part, a leaflet, and a reinforcing block. The connecting part is circular, the leaflet is frustoconical, and the connecting part closes the top opening of the leaflet. The reinforcing block is a right trapezoid, with its upper base connected to the connecting part and its hypotenuse connected to the inner surface of the leaflet. Along the circumference of the connecting part, the connecting part is divided into a fan-shaped opening and closing area and a fan-shaped reinforcing area. The angle of the opening and closing area is less than 180°. There are multiple reinforcing blocks, which are connected to the reinforcing areas and evenly distributed on the reinforcing areas. When the positioning groove engages with the positioning block, the opening / closing area faces downwards.

4. The pump casing according to claim 3, characterized in that, The length of the upper bottom of the reinforcing block is 1 / 3 to 2 / 3 of the radius of the connecting part.

5. The pump casing according to claim 3, characterized in that, The length of the hypotenuse of the reinforcing block is 2 / 3 to 3 / 4 of the length of the generatrix of the petal.

6. The pump casing according to claim 3, characterized in that, The angle of the opening and closing zone is 90°-150°.

7. The pump casing according to claim 3, characterized in that, The inner wall of the first shell is provided with an annular groove, and the outer periphery of the insertion part is provided with an annular retaining strip, which cooperates with the groove.

8. The pump casing according to any one of claims 3-7, characterized in that, The second shell includes a large-diameter section and a small-diameter section connected to each other. The inner diameter of the large-diameter section is larger than the inner diameter of the small-diameter section. The large-diameter section is farther away from the first end of the second shell than the small-diameter section. A first step structure is formed between the large-diameter section and the small-diameter section. The length of the small-diameter section is greater than the length of the first shell. The outer surface of the petal is provided with a second step structure, which cooperates with the first step structure.

9. The pump casing according to claim 8, characterized in that, The inclined side of the reinforcing block covers the second step structure.

10. The pump casing according to claim 1, characterized in that, The inverted pump is an inverted foam pump or an inverted emulsion pump.

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