Pressure stabilizing device

Abstract

The utility model provides a pressure stabilizing device which comprises a cavity and a buoy. Through the structural arrangement of the cavity and the float bowl, when liquid flows into the cavity through the liquid inlet of the cavity and also flows into the float bowl, the liquid level and the inner wall of the float bowl form a first pressure regulating air chamber. When the liquid flows into the cavity, the floating barrel floats upwards, so that the sealing plug at the top of the floating barrel seals the ventilation opening, and a second pressure regulating air chamber is formed between the liquid level and the inner wall of the cavity. And the air pressure of the first pressure-regulating air chamber and the second pressure-regulating air chamber changes along with the rising and falling of the liquid level. When the liquid pressure is increased, the liquid level in the pressure stabilizing device rises, the first pressure regulating air chamber and the second pressure regulating air chamber absorb pressure energy, and the air pressure is increased; and when the liquid pressure is reduced, the liquid level in the pressure stabilizing device is lowered, the first pressure regulating air chamber and the second pressure regulating air chamber release the absorbed pressure energy, and the air pressure is reduced. According to the pressure stabilizing device in the embodiment, pressure fluctuation in the liquid pipeline can be effectively restrained, and the good pressure stabilizing effect is achieved.

Description

Technical Field

[0001] The utility model relates to a liquid supply system, in particular to a voltage stabilizing device. Background Art

[0002] For any device involving liquid usage and supply, a liquid supply system is usually provided inside. The liquid supply system generally includes electrical components such as a water valve and a water pump, as well as a liquid path channel. The start and stop of any electrical component will cause the pressure in the liquid path channel to change, thereby generating pressure fluctuations, which will, in the lightest case, produce noise and affect the user experience, and in the worst case, damage the normal operation of the liquid supply system. Content of the Utility Model

[0003] An object of the utility model is to solve the deficiencies existing in the prior art, and to provide a voltage stabilizing device capable of reducing pressure fluctuations.

[0004] To solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A voltage stabilizing device is arranged on a liquid path pipeline and is communicated with the liquid path pipeline, and includes:

[0006] A cavity, an inlet and an outlet are opened at the bottom of the cavity, the inlet and the outlet are respectively communicated with the liquid path pipeline, a ventilation port is opened at the top of the cavity, a chamber is arranged inside the cavity, and the ventilation port enables the chamber to communicate with the outside;

[0007] A floating cylinder is arranged in the chamber and there is a gap between the outer wall of the floating cylinder and the inner wall of the cavity, so that the floating cylinder can float up and down in the chamber; a sealing plug is arranged at the top of the floating cylinder, and an opening is arranged at the bottom of the floating cylinder. Liquid flows from the inlet to the chamber and inside the floating cylinder. A first pressure regulating air chamber is formed between the liquid level in the chamber and the inner wall of the floating cylinder. The floating cylinder floats up until the sealing plug seals the ventilation port, so that a second pressure regulating air chamber is formed between the liquid level and the inner wall of the cavity. The air pressures of the first pressure regulating air chamber and the second pressure regulating air chamber change with the rise and fall of the liquid level.

[0008] In an exemplary embodiment, the floating cylinder includes a main body part and a connecting part connected to the main body part. The sealing plug is arranged on the side of the connecting part far away from the main body part. From the side wall of the main body part towards the outer periphery of the flexible part, the cross-sectional area of the connecting part gradually decreases.

[0009] In an exemplary embodiment, the outer contour of the main body part is generally cylindrical, and a plurality of concave parts are arranged on the side wall of the main body part. The concave parts are used for ventilation and air supplement.

[0010] In an exemplary embodiment, the liquid inlet is provided on the side wall of the cavity, and the liquid outlet is disposed opposite to the ventilation port.

[0011] In an exemplary embodiment, the liquid inlet is disposed opposite to the ventilation port, and the liquid outlet is provided on the side wall of the cavity.

[0012] In an exemplary embodiment, the cavity includes a main cavity and an end cover. The main cavity is detachably connected to the end cover, and the main cavity and the end cover enclose to form the chamber.

[0013] The voltage stabilizing device further includes a sealing ring, and the sealing ring is clamped between the main cavity and the end cover.

[0014] In an exemplary embodiment, a plurality of support blocks are convexly provided at intervals along the circumferential direction on the inner wall of the main cavity, and the support blocks are used for supporting the floating cylinder.

[0015] In an exemplary embodiment, a plurality of convex blocks are provided on the top of the main cavity, and the plurality of convex blocks are arranged at intervals along the outer periphery of the main cavity. The end cover is provided with a plurality of the clamping portions at intervals along its outer periphery, and each convex block is correspondingly connected to each clamping portion to fix the end cover on the main cavity.

[0016] In an exemplary embodiment, limiting blocks are provided on both sides of at least one of the convex blocks, and the clamping portion is located between the two limiting blocks.

[0017] In an exemplary embodiment, a protruding portion is provided at the ventilation port, and the radial dimension of the protruding portion is smaller than the radial dimension of the sealing plug. The sealing plug first abuts against the ventilation port when floating up with the floating cylinder.

[0018] As can be seen from the above technical solutions, the present utility model has at least the following advantages and positive effects:

[0019] The voltage stabilizing device in the present utility model includes a cavity and a floating cylinder. Through the structural settings of the cavity and the floating cylinder, when the liquid flows through the liquid inlet of the cavity into the cavity, it also flows into the interior of the floating cylinder, and a first pressure regulating air chamber is formed between the liquid level and the inner wall of the floating cylinder. When the liquid flows into the cavity, it also causes the floating cylinder to float, so that the top of the floating cylinder seals the air vent, and a second pressure regulating air chamber is formed between the liquid level and the inner wall of the cavity. The air pressures in the first pressure regulating air chamber and the second pressure regulating air chamber change with the rise and fall of the liquid level. When the liquid pressure increases, the liquid level inside the voltage stabilizing device rises, and the first pressure regulating air chamber and the second pressure regulating air chamber absorb the pressure energy and the air pressure increases. Then, the air pressures in the first pressure regulating air chamber and the second pressure regulating air chamber can absorb the increased liquid pressure. When the liquid pressure decreases, the liquid level inside the voltage stabilizing device drops, and the first pressure regulating air chamber and the second pressure regulating air chamber release the absorbed pressure energy and the air pressure decreases. Then, the air pressures in the first pressure regulating air chamber and the second pressure regulating air chamber can compensate for the decreased liquid pressure. Equivalently, the voltage stabilizing device has the function of cutting peaks and filling valleys, effectively suppressing the pressure fluctuations in the liquid pipeline, and enabling the liquid to flow smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 FIG. is a perspective view of the voltage stabilizing device according to an embodiment of the present utility model.

[0021] Figure 2 is Figure 1 a sectional view of the voltage stabilizing device shown along the A-A direction.

[0022] Figure 3 is Figure 1 a perspective view of the cavity in the voltage stabilizing device shown.

[0023] Figure 4 is Figure 1 a perspective view of the end cover in the voltage stabilizing device shown.

[0024] Figure 5 is Figure 1 a perspective view of the floating cylinder in the voltage stabilizing device shown.

[0025] The descriptions of the reference numerals are as follows: 100, voltage stabilizing device; 10, cavity; 11, chamber; 12, main cavity; 121, first chamber; 122, step; 123, convex block; 124, limiting block; 125, support block; 13, end cover; 131, cover body; 132, extension part; 133, second chamber; 134, flange; 135, clamping part; 1351, clamping groove; 136, protruding part; 14, air vent; 15, liquid inlet; 16, liquid outlet; 20, sealing ring; 30, floating cylinder; 31, opening; 32, main body part; 321, concave part; 33, connecting part; 331, receiving groove; 40, sealing plug. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] Exemplary embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various variations in different embodiments, all of which do not depart from the scope of the present invention, and the descriptions and illustrations therein are for illustrative purposes in nature and not intended to limit the present invention.

[0027] In the description of the present application, it should be understood that in the embodiments shown in the drawings, the indication of the direction or positional relationship (such as up, down, left, right, front, and back, etc.) is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation. When these elements are in the positions shown in the drawings, these descriptions are appropriate. If the description of the positions of these elements changes, then the indication of these directions also changes accordingly.

[0028] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0029] The liquid supply system generally includes liquid pipelines for liquid to flow. The flow of liquid in the liquid pipeline usually has liquid pressure. Taking water as an example of the liquid, water has a certain water pressure when flowing in the liquid pipeline. Electric components such as water valves and water pumps are usually connected in series on the liquid pipeline. The start, operation, or stop of the electric components will cause the pressure in the liquid pipeline to change and generate pressure fluctuations.

[0030] The present embodiment provides a voltage stabilizing device which is arranged on the liquid pipeline and communicated with the liquid pipeline so that the liquid can flow through the inside of the voltage stabilizing device, and the voltage stabilizing device can effectively suppress the pressure fluctuations in the liquid pipeline and has a good voltage stabilizing effect. The specific solution will be described through the following embodiments.

[0031] Please refer to Figures 1 to 3 , the voltage stabilizing device 100 includes a cavity 10. A chamber 11 is provided inside the cavity 10.

[0032] In some embodiments, the cavity 10 includes a main cavity 12 and an end cover 13. The main cavity 12 is detachably connected to the end cover 13, and the main cavity 12 and the end cover 13 enclose to form the chamber 11.

[0033] Specifically in this embodiment, please refer to Figure 3 , Figure 4 and in combination with Figure 2, the main cavity 12 is provided with a first chamber 121. The notch direction of the first chamber 121 faces the end cover 13. The end cover 13 includes a cover body 131 and an extension portion 132. The extension portion 132 is arranged along the periphery of the cover body 131 and protrudes from the side of the cover body 131 facing the main cavity 12. When the end cover 13 is covered on the main cavity 12, the surface of the cover body 131 abuts against the top end face of the main cavity 12, and the extension portion 132 is received in the first chamber 121. The outer peripheral wall of the extension portion 132 is close to or directly abuts against the side wall of the main cavity 12 to seal the notch of the main cavity 12. The arrangement that the outer peripheral wall of the extension portion 132 is close to or directly abuts against the side wall of the main cavity 12 can effectively prevent the end cover 13 from shaking in the direction perpendicular to the axis of the main cavity 12.

[0034] The extension portion 132 and the cover body 131 enclose a second chamber 133. The notch direction of the second chamber 133 faces the main cavity 12. The inner peripheral wall of the extension portion 132 forms the side wall of the second chamber 133, and the surface of the cover body 131 on the side facing the main cavity 12 forms the bottom wall of the second chamber 133. It can be understood that the chamber 11 is jointly composed of the first chamber 121 and the second chamber 133.

[0035] In some embodiments of the present application, a step 122 is recessed along the periphery of the top of the main cavity 12. The end cover 13 is provided with a flange 134 adapted to the step 122, and the flange 134 protrudes from the outer peripheral wall of the extension portion 132. The arrangement of the step 122 and the flange 134 forms a good sealing structure and can improve the sealing performance of the cavity 10.

[0036] In some embodiments, the voltage stabilizing device 100 further includes a sealing ring 20, and the sealing ring 20 is clamped between the main cavity 12 and the end cover 13 to further improve the sealing performance of the cavity 10.

[0037] Specifically, in this embodiment, the sealing ring 20 is arranged on the outer peripheral wall of the extension portion 132. When the end cover 13 is connected to the main cavity 12, the sealing ring 20 is clamped between the step 122 and the flange 134.

[0038] A plurality of protrusions 123 are provided on the outer peripheral wall of the top of the main cavity 12. The plurality of protrusions 123 are arranged at intervals along the outer periphery of the main cavity 12. The end cover 13 is provided with a plurality of clamping portions 135 at intervals along its outer periphery. Each clamping portion 135 is correspondingly connected to each protrusion 123 to mount the end cover 13 on the main cavity 12. Further, a card slot 1351 is formed on the clamping portion 135, and the protrusion 123 can be received in the card slot 1351.

[0039] In some embodiments, limiting blocks 124 are provided on both sides of at least one bump 123. The clamping portion 512 is located between the two limiting blocks 124. The arrangement of the limiting blocks 124 can limit the rotation of the end cap 13, further fix the end cap 13, and ensure the stability of the end cap 13.

[0040] It can be understood that the detachable connection method between the main cavity 12 and the end cap 13 in this embodiment is snap connection. In other embodiments, the connection between the main cavity 12 and the end cap 13 can also be threaded connection, screw connection, etc., which can be specifically set according to actual needs, as long as a chamber 11 can be formed inside the cavity 10 and the sealing performance of the cavity 10 can be ensured, and no limitation is made here.

[0041] See Figure 1 and Figure 2 , and a vent port 14 is provided at the top of the cavity 10. Specifically, the vent port 14 can be provided at the center of the end cap 13. The arrangement of the vent port 14 enables the chamber 11 to communicate with the outside.

[0042] An inlet port 15 and an outlet port 16 are provided at the bottom of the cavity 10. The inlet port 15 and the outlet port 16 are respectively connected to the chamber 11 and the liquid pipeline, so that the liquid in the liquid pipeline can flow into the chamber 11 through the inlet port 15 and flow out of the chamber 11 through the outlet port 16 and into the liquid pipeline.

[0043] In this embodiment, the inlet port 15 is disposed opposite to the vent port 14. The outlet port 16 is provided on the side wall of the main cavity 12. In other embodiments, it can also be that the inlet port 15 is provided on the side wall of the main cavity 12 and the outlet port 16 is disposed opposite to the vent port 14, which can be specifically set according to actual needs and no limitation is made here. As long as the liquid can flow into the chamber 11 through the inlet port 15 and flow out through the outlet port 16.

[0044] Please refer to Figure 2 , the voltage stabilizing device 100 includes a float 30. The float 30 is disposed in the chamber 11 of the cavity 10. An opening 31 is provided at one end of the float 30 away from the vent port 14, so that the inside of the float 30 is communicated with the inside of the chamber 11. When the pressurized liquid flows from the inlet port 15 into the chamber 11, the liquid also flows into the inside of the float 30, and a first pressure regulating air chamber is formed between the liquid level and the inner wall of the float 30.

[0045] The air pressure in the first pressure regulating air chamber can change with the rise and fall of the liquid level, effectively alleviating the pressure fluctuation caused by the change of liquid pressure due to the start and stop of electrical components.

[0046] Specifically, when the liquid pressure increases, the liquid level in the chamber 11 rises, and the first pressure regulating air chamber absorbs and stores the increased pressure energy to prevent the liquid pressure in the liquid pipeline from rising; when the liquid pressure decreases, the liquid level in the chamber 11 drops, and the first pressure regulating air chamber releases the absorbed pressure energy to prevent the pressure in the liquid pipeline from dropping, thereby maintaining the stability of the liquid pressure in the liquid pipeline.

[0047] There is a gap between the outer wall of the floating cylinder 30 and the inner wall of the cavity 10, enabling the floating cylinder 30 to float up and down in the chamber 11. When the floating cylinder 30 floats up to a position where its top can cover and seal the vent 14, a second pressure regulating air chamber is formed between the liquid level in the chamber 11 and the inner wall of the cavity 10.

[0048] The air pressure in the second pressure regulating air chamber can also change with the rise and fall of the liquid level. Specifically, when the liquid pressure increases, the liquid level in the chamber 11 rises, and the second pressure regulating air chamber absorbs and stores the increased pressure energy to prevent the liquid pressure in the liquid pipeline from rising; when the liquid pressure decreases, the liquid level in the chamber 11 drops, and the second pressure regulating air chamber releases the absorbed pressure energy to prevent the liquid pressure in the liquid pipeline from dropping, thereby maintaining the stability of the liquid pressure in the liquid pipeline.

[0049] It should be noted that the voltage stabilizing device 100 is equivalent to being connected in series to the liquid pipeline. Pressure fluctuations in the liquid pipelines before and after the voltage stabilizing device 100 will cause the liquid level in the chamber 11 of the voltage stabilizing device 100 to rise and fall. And because there is a gap between the outer wall of the floating cylinder 30 and the inner wall of the cavity 10, and the inside of the floating cylinder 30 communicates with the chamber 11, it can be understood that the liquid level height inside the floating cylinder 30 is the same as the liquid level height between the outer wall of the floating cylinder 30 and the inner wall of the cavity 10, and they rise and fall synchronously. The first pressure regulating air chamber and the second pressure regulating air chamber are independent of each other and can change synchronously with the rise and fall of the liquid level. The first pressure regulating air chamber and the second pressure regulating air chamber have the function of cutting peaks and filling valleys. They work together to adjust the liquid pressure in the liquid pipeline simultaneously to suppress pressure fluctuations and achieve the purpose of voltage stabilization.

[0050] In some embodiments of the present application, the voltage stabilizing device 100 includes a sealing plug 40. The sealing plug 40 is arranged at the top of the floating cylinder 30, and the sealing plug 40 can seal the vent 14. Specifically, the sealing plug covers and seals the vent 14 as the floating cylinder 30 floats up.

[0051] Further, continue to refer to Figure 2, the end cap further includes a protruding portion 136 which is provided at the vent port. The protruding portion 136 cooperates with the sealing plug 40 to better seal the vent port 14. Specifically, the protruding portion 136 is provided on the surface of the cover body 131 facing the main cavity 12, and the protruding portion 136 communicates with the vent port 14. The radial dimension of the protruding portion 136 is smaller than the radial dimension of the sealing plug. Compared with the surface of the cover body 131 facing the floating cylinder 30, the end face of the protruding portion 136 is closer to the sealing plug 40. Thus, when the sealing plug 40 floats up with the floating cylinder 30, it first abuts against the protruding portion 136, generating a pressing force on the protruding portion 136. When the sealing plug 40 is a flexible plug, the sealing plug 40 abuts against the protruding portion 136 and can deform to tightly wrap the protruding portion 136, thereby ensuring the sealing performance of the vent port 14.

[0052] In some embodiments, the outer peripheral surface of the protruding portion 136 is an inclined surface which is inclined from the center of the vent port 14 towards the circumferential direction of the cover body 131.

[0053] Please refer to Figure 5 and combine with Figure 2 , the floating cylinder 30 includes a main body portion 32 and a connecting portion 33. The connecting portion 33 is connected to the main body portion 32. The connecting portion 33 and the main body portion 32 are integrally formed.

[0054] The sealing plug 40 is provided at one end of the connecting portion 33 away from the main body portion 32. In some embodiments of the present application, a receiving groove 331 is provided at one end of the connecting portion 33 away from the main body portion. The notch direction of the receiving groove 331 faces the end cap 13. The sealing plug 40 is received in the receiving groove 331.

[0055] It should be noted that the connection between the sealing plug 40 and the floating cylinder 30 can be an interference fit, a threaded connection, an adhesive connection, etc., which can be specifically set according to actual needs and are not limited herein. The sealing plug 40 can be a rubber plug, a silica gel plug, etc.

[0056] From the side wall of the main body portion 32 towards the outer periphery of the sealing plug 40, the cross-sectional area of the connecting portion 33 gradually decreases to increase the volume of the second pressure regulating air chamber, so as to increase the adjustable range of the liquid pressure.

[0057] The outer contour of the main body portion 32 is generally cylindrical. In the direction perpendicular to the axis of the cavity, the aperture of the main body portion 32 is basically the same as the aperture of the main cavity 12, so that the cavity 10 has a guiding effect on the up and down movement of the floating cylinder 30, enabling the floating cylinder 30 to rise smoothly and preventing the sealing plug 40 from shaking when floating up with the floating cylinder 30 and thus failing to seal the vent port 14.

[0058] In some embodiments, a plurality of recesses 321 are provided on the side wall of the main body portion 32, and the recesses 321 are recessed toward the inside of the main body portion 32. Specifically, in this embodiment, there are six recesses 321, and the inner wall of the recess 321 is arc-shaped, so that the cross-section of the main body portion 32 in this embodiment is an arc-shaped hexagon. In other embodiments, the number of the recesses 321 may also be three, four, etc., which can be specifically set according to actual needs and will not be limited here.

[0059] The recess 321 is used for ventilation and air supplement. Specifically, the setting of the recess 321 is beneficial to the flow of external gas inside the cavity 10 when the main cavity 12 is connected to the outside after the liquid pipeline stops feeding liquid, facilitating the automatic replenishment of air inside the float 30, ensuring that a first pressure regulating air chamber can be stably formed inside the float 30 during subsequent use, and enabling the voltage stabilizing device 100 of this embodiment to be used stably for a long time. [[ID=—4]]

[0060] Please refer to Figure 2 , and a plurality of support blocks 125 are convexly provided on the inner wall of the main cavity 12. The support blocks 125 are used to support the float 30 to prevent the float 30 from blocking the liquid inlet 15. Specifically, the plurality of support blocks 125 are arranged at intervals along the circumferential direction of the main cavity 12. When no liquid flows into the chamber 11, the float 30 drops under the action of its own gravity, and the end face of the float 30 with the opening 31 contacts the surface of the support block 125.

[0061] Further, in the cross-section perpendicular to the axis direction of the main body portion 32, the maximum distance between the recess 321 and the inner side wall of the main cavity 12 is less than the radial length of the support block 125, so as to ensure that even if the float 30 rotates under the action of liquid buoyancy, the support block 125 can support the float 30 when it drops.

[0062] After the liquid pipeline stops feeding liquid, the float 30 descends, making the inside of the voltage stabilizing device 100 communicate with the outside, realizing the air pressure balance inside and outside the liquid pipeline, facilitating the rapid flow of the liquid in the liquid pipeline, and being beneficial to the complete outflow of the liquid in the liquid pipeline, effectively avoiding the liquid remaining in the liquid pipeline.

[0063] As can be seen from the above technical solutions, the voltage stabilizing device 100 provided by this embodiment has the following advantages and beneficial implementation effects.

[0064] By setting the structures of the cavity 10 and the float 30 in the voltage stabilizing device 100, the pressure in the liquid pipeline 10 can be adjusted, effectively reducing the pressure fluctuations generated by the start and stop of electrical components, ensuring stable liquid pressure and smooth flow rate, and having a good voltage stabilizing effect. In addition, when the liquid supply system stops supplying liquid, the voltage stabilizing device 100 can communicate with the outside atmosphere, which is beneficial to quickly emptying the liquid in the liquid pipeline 10.

[0065] The above embodiments are only illustrative examples of the structure. The structures in each embodiment are not combined structures with fixed collocations. Without structural conflicts, the structures in multiple embodiments can be used in any combination.

[0066] Although the present invention has been described with reference to several exemplary embodiments, it should be understood that the terms used are descriptive and exemplary, rather than restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be broadly construed within the spirit and scope defined by the appended claims. Therefore, all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A voltage stabilizing device is provided on a liquid pipeline and is in communication with the liquid pipeline, characterized in that Comprising: A cavity, an inlet and an outlet are provided at the bottom of the cavity, the inlet and the outlet are respectively communicated with the liquid pipeline, a ventilation port is provided at the top of the cavity, a chamber is provided inside the cavity, and the ventilation port enables the chamber to communicate with the outside; A floating cylinder, the floating cylinder is arranged in the chamber and there is a gap between the outer wall of the floating cylinder and the inner wall of the cavity, so that the floating cylinder can float up and down in the chamber; a sealing plug is provided at the top of the floating cylinder, and an opening is provided at the bottom of the floating cylinder. Liquid flows from the inlet to the chamber and into the floating cylinder. A first pressure regulating air chamber is formed between the liquid level in the chamber and the inner wall of the floating cylinder. The floating cylinder floats up until the sealing plug seals the ventilation port, so that a second pressure regulating air chamber is formed between the liquid level and the inner wall of the cavity. The air pressures of the first pressure regulating air chamber and the second pressure regulating air chamber change with the rise and fall of the liquid level.

2. The voltage stabilizing device according to claim 1, characterized in that, The floating cylinder includes a main body portion and a connecting portion connected to the main body portion. The sealing plug is arranged on the side of the connecting portion away from the main body portion. From the side wall of the main body portion towards the outer periphery of the sealing plug, the cross-sectional area of the connecting portion gradually decreases.

3. The voltage stabilizing device according to claim 2, wherein The outer contour of the main body portion is generally cylindrical, and a plurality of concave portions are provided on the side wall of the main body portion for ventilation and air supplement.

4. The voltage stabilizing device according to claim 1, characterized in that, The inlet is provided on the side wall of the cavity, and the outlet is arranged opposite to the ventilation port.

5. The voltage stabilizing device according to claim 1, characterized in that, The inlet is arranged opposite to the ventilation port, and the outlet is provided on the side wall of the cavity.

6. The voltage stabilizing device according to claim 1, wherein The cavity includes a main cavity and an end cover. The main cavity and the end cover are detachably connected, and the main cavity and the end cover enclose the chamber; The voltage stabilizing device further includes a sealing ring, and the sealing ring is clamped between the main cavity and the end cover.

7. The voltage stabilizing device according to claim 6, characterized in that, A plurality of support blocks are convexly provided on the inner wall of the main cavity at intervals along its circumference, and the support blocks are used to support the floating cylinder.

8. The voltage stabilizing device according to claim 6, characterized in that, A plurality of convex blocks are provided on the top of the main cavity, and the plurality of convex blocks are arranged at intervals along the outer periphery of the main cavity. The end cover is provided with a plurality of clamping portions at intervals along its outer periphery, and each convex block is correspondingly connected to each clamping portion to fix the end cover on the main cavity.

9. The voltage stabilizing device according to claim 8, characterized in that, Limit blocks are provided on both sides of at least one of the convex blocks, and the clamping portion is located between the two limit blocks.

10. The voltage stabilizing device according to claim 1, characterized in that, A protruding portion is provided at the ventilation port, and the radial dimension of the protruding portion is smaller than the radial dimension of the sealing plug. The sealing plug first abuts against the ventilation port when floating up with the floating cylinder.

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