Vacuum pressure relief valve and negative pressure machine
By designing a vacuum pressure relief valve, using mechanical structure and POM materials, the problems of damage and high cost of parts caused by excessive vacuum of the negative press are solved, and stable and reliable pressure control and cost reduction are achieved.
Patent Information
- Application Number
- CN202421991815.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-16
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-08-16
AI Technical Summary
Existing negative presses in dental treatments have damaged parts due to excessive vacuum, which affects service life, while using sensors and solenoid valves increases costs.
A vacuum pressure relief valve is designed, using an outer shell, support block, sealing cover and reset components, and pressure control is achieved through mechanical structure, reducing the use of circuit components, and using POM materials to reduce costs and processing accuracy requirements.
It realizes stable and reliable pressure control, reduces costs, avoids the use of sensors and solenoid valves, extends the service life of the negative pressure machine, and reduces the processing accuracy requirements.
Smart Images
Figure CN223076350U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical devices, and in particular to a vacuum pressure relief valve and a negative pressure machine. Background Art
[0002] In dental treatment, it is often necessary to use negative pressure to suck saliva. The negative pressure machine that generates negative pressure continuously creates a vacuum degree to meet the negative pressure requirements. However, if the vacuum degree is too high, it will cause an increase in the pressure on the negative pressure machine, resulting in damage to some components and affecting the service life of the negative pressure machine.
[0003] In the existing solution, the negative pressure value is detected by a pressure sensor, and then the on-off of the solenoid valve is controlled through circuit feedback to achieve the effect of controlling the pressure. However, due to the use of the sensor and the solenoid valve, the cost has increased. Moreover, the existing negative pressure machines use metal parts as components, and the cost of metal parts is high, and the processing accuracy requirements are high. Therefore, it is necessary to provide a vacuum pressure relief valve and a negative pressure machine using the vacuum pressure relief valve to solve the above technical problems. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a stable and reliable vacuum pressure relief valve and a negative pressure machine using the vacuum pressure relief valve, which do not require the feedback control of circuit components, reduce the use of sensors and solenoid valves, and effectively reduce the cost.
[0005] The utility model is realized through the following technical solutions:
[0006] A vacuum pressure relief valve includes an outer shell, a support block, a sealing cover, and a reset assembly; a through installation cavity is opened in the middle of the outer shell; the support block is installed in the installation cavity; a blocking position for clamping is provided in the installation cavity, so that the support block can only be inserted from the outer end of the outer shell and cannot pass through the inner end of the outer shell due to the blocking of the blocking position; the reset assembly is installed on the support block; there are a plurality of through ventilation holes in the middle of the support block; one end of the reset assembly passes through the support block and is connected to the sealing cover; the outer diameter of the sealing cover is larger than the inner end aperture, and under the action of the reset assembly, the sealing cover can movably block the inner end.
[0007] Further as an improvement of the technical solution of the utility model, the reset assembly includes a pull rod, a spring, an upper end fixing member, and a lower end fixing member; clamping positions are provided at both ends of the pull rod, the lower end of the pull rod is sequentially installed with the support block, the sealing cover, and the lower end fixing member, and the lower end fixing member is fixedly connected to the clamping position at the outermost side of the lower end of the pull rod; the upper end of the pull rod is sequentially installed with the spring and the upper end fixing member, and the upper end fixing member is adjustably installed at the clamping position at the outermost side of the upper end of the pull rod.
[0008] Further as an improvement of the technical solution of the present utility model, threads are provided on the outer side walls of the outer end and the inner end; a top cover is installed on the top of the outer end; the middle of the top cover is penetrated; the inner end is connected to the pipeline group through threads.
[0009] Further as an improvement of the technical solution of the present utility model, a filter layer is installed between the top cover and the outer end.
[0010] Further as an improvement of the technical solution of the present utility model, the filter layer is made of filter cotton of PU material; the top cover, the outer shell, the plugging cover and the support block are all made of POM material.
[0011] Further as an improvement of the technical solution of the present utility model, the plugging cover forms a trapezoid-like cross-section; the diameters of the two end faces of the plugging cover are different, and the diameter of the end face facing the inner port is smaller than the diameter of the end face facing away from the inner port.
[0012] Further as an improvement of the technical solution of the present utility model, an annular groove is provided on the side surface of the plugging cover; a sealing ring is installed on the annular groove; the sealing ring abuts against the wall of the inner port.
[0013] Further as an improvement of the technical solution of the present utility model, the end face of the wall of the inner port to the inner side wall is set to an inclined surface that slopes outward.
[0014] Further as an improvement of the technical solution of the present utility model, both the upper fixing member and the lower fixing member are made of locknuts.
[0015] Further as an improvement of the technical solution of the present utility model, a negative pressure machine includes a negative pressure source, a pipeline group and a vacuum pressure relief valve; the vacuum pressure relief valve is installed on the pipeline group, and the pipeline group is connected to the negative pressure source; when the negative pressure value in the pipeline group reaches the working pressure of the vacuum pressure relief valve, the vacuum pressure relief valve opens, and external gas flows into the pipeline group to increase the pressure in the pipeline group.
[0016] Compared with the prior art, the present utility model provides a vacuum pressure relief valve and a negative pressure machine, having the following
[0017] Beneficial effects:
[0018] The present utility model provides a stable and reliable vacuum pressure relief valve. The vacuum pressure relief valve is provided with a housing, a support block, a sealing cover and a reset assembly; a through installation cavity is opened in the middle of the housing; the support block is installed in the installation cavity; a clamping blocking position is provided in the installation cavity, so that the support block can only be inserted from the outer end of the housing and cannot pass through from the inner end of the housing due to the blocking of the blocking position; the reset assembly is installed on the support block; there are a plurality of through ventilation holes in the middle of the support block to ensure that gas can flow through; one end of the reset assembly passes through the support block and is connected to the sealing cover; the opening of the sealing cover is larger than the inner end aperture, and under the action of the reset assembly, the sealing cover seals the inner end; the present utility model does not require the feedback control of circuit components, reduces the use of sensors and solenoid valves, and effectively reduces the cost; the housing, the sealing cover and the support block are all made of POM material, which has high strength and self-lubricating effect, and the fitting effect is better than that of metal. By replacing the material, the cost and processing precision requirements can be reduced; therefore, there is no need to add a sliding sleeve for the contact between the pull rod and the support block, which also saves cost and avoids the wear and noise generated by the metal contact between the support block and the pull rod made of metal material. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 is a three-dimensional structural schematic diagram of a vacuum pressure relief valve of the present utility model;
[0020] Figure 2 is an exploded structural schematic diagram of a vacuum pressure relief valve of the present utility model;
[0021] Figure 3 is a sectional structural schematic diagram of a vacuum pressure relief valve of the present utility model when it is closed;
[0022] Figure 4 is a sectional structural schematic diagram of a vacuum pressure relief valve of the present utility model when it is opened;
[0023] Figure 5 is Figure 3 a sectional structural schematic diagram at position A in
[0024] Figure 6 is Figure 4 a sectional structural schematic diagram at position B in
[0025] In the figure: 100 - vacuum pressure relief valve; 1 - housing; 2 - support block; 3 - sealing cover; 4 - reset assembly; 5 - top cover; 6 - filter layer; 7 - sealing ring; 11 - outer end; 12 - inner end; 21 - ventilation hole; 41 - pull rod; 42 - spring; 43 - upper end fixing part; 44 - lower end fixing part; 45 - flange nut. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.
[0027] It should be noted that all directional indications (such as up, down, left, right, front, back, upper end, lower end, top, bottom, etc.) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.
[0028] In the present utility model, unless otherwise clearly defined and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meaning of the above terms in the present utility model can be understood according to specific circumstances.
[0029] In addition, in the present utility model, descriptions such as "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions conflicts with each other or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.
[0030] Such as Figures 1 to 6As shown in the figure, a vacuum pressure relief valve 100 includes a housing 1, a support block 2, a plugging cover 3, and a reset assembly 4. A through installation cavity is formed in the middle of the housing 1. The support block 2 is installed in the installation cavity. The installation cavity is provided with a clamping blocking position, so that the support block 2 can only be inserted from the outer end 11 of the housing 1 and cannot pass through the inner end 12 of the housing 1 due to the blocking of the blocking position. The reset assembly 4 is installed on the support block 2. There are a plurality of through ventilation holes 21 in the middle of the support block 2 to ensure that gas can flow through. One end of the reset assembly 4 passes through the support block 2 and is connected to the plugging cover 3. The opening of the plugging cover 3 is larger than the aperture of the inner end 12. Under the action of the reset assembly 4, the plugging cover 3 plugs the inner end 12.
[0031] It should be noted that, as shown in Figure 5 and Figure 6 , since the inner end 12 opening and the outer end 11 opening are blocked, and the inner end 12 is connected to the pipeline group, that is, when the pressure does not reach the force to overcome the force provided by the reset assembly 4, the vacuum pressure relief valve 100 cannot pass through the gas. When the negative pressure in the pipeline group is large, that is, when the pressure is very small, the pressure acting on the plugging cover 3 due to the pressure difference with the outside is greater than the force acting on the plugging cover 3 by the reset assembly 4, the plugging cover 3 drives the reset assembly 4 to move to open the inner port, and the external gas enters the pipeline group, so that the pressure in the pipeline group rises. After the air pressure rises, the pressure difference cannot overcome the force of the reset assembly 4 to close the inner port again. Among them Figure 6 the arrowed lines are the gas flow directions.
[0032] It should be noted that, with respect to the pipeline, the end connected to the pipeline is the inner end 12, and the other end is the outer end 11.
[0033] Specifically, in the solution of this embodiment, the reset assembly 4 includes a pull rod 41, a spring 42, an upper end fixing member 43, a lower end fixing member 44, and a flange nut 45. Clamping positions are provided at both ends of the pull rod 41. After the lower end of the pull rod 41 passes through the support block 2 and then through the plugging cover 3, the lower end fixing member 44 is threadedly connected to the lower end of the pull rod 41. After the spring 42 is sleeved on the upper end of the pull rod 41, the flange nut 45 is screwed on to clamp the spring 42 and then fixed through the upper end fixing member 43. It should be noted that the clamping positions at both ends of the pull rod 41 are both threaded. The pull rod 41 passes through the support block 2 and then through the plugging cover 3, and then the lower end fixing member 44 is screwed on the outermost side. For the other end of the pull rod 41, after the spring 42 is sleeved on, the flange nut 45 is screwed on to clamp the spring 42 and then the upper end fixing member 43 is screwed on and fixed. If the pressure value for opening the vacuum pressure relief valve is to be set, the compression force of the spring 42 can be adjusted by screwing the flange nut 45 and the upper end fixing member 43.
[0034] Specifically, in the solution of this embodiment, threads are provided on the outer side walls of the outer end 11 and the inner end 12; a top cover 5 is installed at the top of the outer end 11; the middle of the top cover 5 is penetrated; the inner end 12 is connected to the pipe group by threads.
[0035] Specifically, in the solution of this embodiment, a filter layer 6 is installed between the top cover 5 and the outer end 11. It should be noted that the filter layer 6 can filter impurities in the external gas and also has a sound absorption effect. The threads at the inner end are used to screw on the pipe group. Although it is a threaded method here, snap fasteners or other methods can also be used for fixation.
[0036] Specifically, in the solution of this embodiment, the filter layer 6 is made of filter cotton of PU material; the top cover 5, the outer housing 1, the plugging cover 3 and the support block 2 are all made of POM material, which has high strength and also has a self-lubricating effect. Therefore, there is no need to add a sliding sleeve for the contact between the pull rod 41 and the support blocks 2, which also saves costs. If the support block 2 is made of metal, it will also cause wear and noise in the metal contact with the pull rod. The fitting effect of POM is better than that of metal, so the processing accuracy requirements are lower compared to metal.
[0037] Specifically, in the solution of this embodiment, the plugging cover 3 forms a trapezoid-like cross-section; the diameters of the two end faces of the plugging cover 3 are different, and the diameter of the end face facing the inner end 12 is smaller than the diameter of the end face facing away from the inner end 12.
[0038] Specifically, in the solution of this embodiment, an annular groove is provided on the side of the plugging cover 3; a sealing ring 7 is installed on the annular groove; the sealing ring 7 abuts against the wall of the inner end 12.
[0039] Specifically, in the solution of this embodiment, the end face of the wall of the inner end 12 is set to an inclined surface that slopes outward to the inner side wall, which is beneficial to the reset of the plugging cover 3.
[0040] Specifically, in the solution of this embodiment, both the upper fixing member 43 and the lower fixing member 44 are made of locknuts.
[0041] Specifically, in the solution of this embodiment, a negative pressure machine includes a negative pressure source, a pipe group and a vacuum pressure relief valve 100; the vacuum pressure relief valve 100 is installed on the pipe group, and the pipe group is connected to the negative pressure source; when the negative pressure value in the pipe group reaches the working pressure of the vacuum pressure relief valve 100, the vacuum pressure relief valve 100 opens, and external gas flows into the pipe group, increasing the pressure in the pipe group, that is, the vacuum degree decreases.
[0042] The utility model provides a stable and reliable vacuum pressure relief valve, which does not require the feedback control of circuit components, reduces the use of sensors and solenoid valves, and effectively reduces the cost; the outer shell, the plugging cover and the support block are all made of POM material, which has high strength and self-lubricating effect, and the fitting effect is better than that of metal. The cost and processing precision requirements can be reduced by replacing the material; therefore, there is no need to add a sliding sleeve for the contact between the pull rod and the support block, which also saves the cost and avoids the wear and noise caused by the metal contact between the support block and the pull rod.
[0043] The technical solutions provided by the embodiments of the utility model have been introduced in detail above. Specific examples are used in this article to elaborate on the principles and implementation manners of the embodiments of the utility model. The descriptions of the above embodiments are only applicable to help understand the principles of the embodiments of the utility model; at the same time, for those of ordinary skill in the art, according to the embodiments of the utility model, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the utility model.
Claims
1. A vacuum pressure relief valve, characterized in that: It includes an outer housing, a support block, a sealing cover, and a reset assembly; a through installation cavity is provided in the middle of the outer housing; the support block is installed in the installation cavity; a clamping blocking position is provided in the installation cavity, so that the support block can only be inserted from the outer end of the outer housing and cannot pass through from the inner end of the outer housing due to the blocking of the blocking position; the reset assembly is installed on the support block; there are a plurality of through ventilation holes in the middle of the support block; one end of the reset assembly passes through the support block and is connected to the sealing cover; the outer diameter of the sealing cover is greater than the aperture of the inner end, and under the action of the reset assembly, the sealing cover can movably block the inner end.
2. The vacuum pressure relief valve according to claim 1, characterized in that: The reset assembly includes a pull rod, a spring, an upper end fixing part, and a lower end fixing part; clamping positions are provided at both ends of the pull rod. The lower end of the pull rod is successively installed with the support block, the sealing cover, and the lower end fixing part. The lower end fixing part is fixedly connected to the outermost clamping position at the lower end of the pull rod; the upper end of the pull rod is successively installed with the spring and the upper end fixing part. The upper end fixing part is adjustably installed at the outermost clamping position at the upper end of the pull rod.
3. A vacuum pressure relief valve according to claim 1, characterized in that: Threads are provided on the outer side walls of both the outer end and the inner end; a top cover is installed at the top of the outer end; the middle of the top cover is through; the inner end is connected to the pipeline group by threads.
4. The vacuum pressure relief valve according to claim 3, characterized in that: A filter layer is installed between the top cover and the outer end.
5. The vacuum pressure relief valve according to claim 4, wherein: The filter layer is made of filter cotton of PU material; the top cover, the outer housing, the sealing cover, and the support block are all made of POM material.
6. The vacuum pressure relief valve according to claim 1, characterized in that: The sealing cover forms a trapezoid-like cross-section; the diameters of the two end faces of the sealing cover are different, and the diameter of the end face facing the inner port is smaller than the diameter of the end face facing away from the inner port.
7. The vacuum pressure relief valve according to claim 6, wherein: A ring groove is provided on the side surface of the sealing cover; a sealing ring is installed on the ring groove; the sealing ring abuts against the wall of the inner port.
8. The vacuum pressure relief valve according to claim 7, characterized in that: The end face of the wall of the inner port is set to an inclined surface that slopes outward from the end face to the inner side wall.
9. A vacuum pressure relief valve according to claim 2, characterized in that: Both the upper end fixing part and the lower end fixing part are made of locknuts.
10. A negative pressure machine, characterized in that: It includes a negative pressure source, a pipeline group, and the vacuum pressure relief valve according to any one of claims 1-9; the vacuum pressure relief valve is installed on the pipeline group, and the pipeline group is connected to the negative pressure source; when the negative pressure value in the pipeline group reaches the working pressure of the vacuum pressure relief valve, the vacuum pressure relief valve opens, and external gas flows into the pipeline group to increase the pressure in the pipeline group.