Rectifier filtering cover, double-filtering-cavity filtering cover, fluid pulse rectifier, multi-channel fluid pulse rectifier and pump

Abstract

The utility model discloses a rectifier filtering cover, a double-filtering-cavity filtering cover, a fluid pulse rectifier, a multi-channel fluid pulse rectifier and a pump, and solves the problem that the elastic limit value of a pulse buffer film reaches the limit to cause failure when the pressure of a filtering cavity linearly changes in a wide range during working. The sine wave amplitude generated by the pulse fluid can be effectively rectified and filtered. Comprising a dome-shaped filtering cavity in the middle of the filtering cover, an arc filtering cavity opening, a buffer film positioning groove, breathing holes and fixing holes, the breathing holes and the fixing holes are evenly distributed around the filtering cavity around the axis of the filtering cavity, the breathing holes and the filtering cavity keep the state of a through hole (TK) or a blind hole (MK) through a blind hole valve element, and the applicability and easy controllability of equipment are improved while the equipment cost is reduced. The blind hole valve element is arranged in the breathing hole, so that the problem that a conventional fluid pulse rectifier cannot be matched with fluid pressure when the pressure changes in a wide range is solved, and the pressure-resistant application range of the filtering cover is increased from 0-120 PSI to 700 PSI.

Description

Technical Field:

[0001] The utility model relates to the technical field of fluid pulse rectification, and more specifically to a fluid pulse rectifier filter cover with a breathing hole and a blind hole valve core, and a fluid pulse rectifier using the filter cover. Technical Background:

[0002] In the technical field of fluid pulse rectification, there are various forms of fluid pulse rectifiers, dampers, and buffers. Most of their working principles are based on Boyle's law, i.e., V = C / P. Their functions are mainly used to balance the fluid pressure generated by various types of pumps in the pipeline system to achieve pulse suppression.

[0003] Chinese Patent Application No. CN20172172481.4 discloses a fluid pulse rectifier. The utility model provides a fluid pulse rectifier that can effectively control the amplitude of the water flow pulse. However, due to its structural characteristics, it is not suitable for working in working conditions with relatively large fluid pressure. Especially when the amplitude of the fluid pressure change is relatively wide, the installation and debugging of this pulse rectifier are relatively complex for ordinary technicians.

[0004] At the same time, the air compensation mechanisms and methods of existing fluid pulse rectifiers are complex in technology and high in cost, which is not conducive to industrial application, especially for batch applications in the field of civilian equipment. Summary of the Utility Model:

[0005] In order to overcome the above-mentioned deficiencies of the prior art, the utility model provides a filter cover that uses the fluid pulsating pressure to automatically adjust the air pressure in the cavity of the filter cavity with a breathing hole, which can effectively rectify and filter the sine wave amplitude generated by the pulsed fluid. It is characterized in that the middle part of the filter cover 1 is a dome-shaped filter cavity 2. An arc-shaped filter cavity opening 5 is arranged at the opening of the filter cavity. A buffer film positioning groove 6 is arranged on the outer edge of the arc-shaped filter cavity opening. Fixing holes 7 are evenly distributed around the axis line 8 of the filter cavity. Breathing holes 3 are evenly distributed around the axis line 8 at the top of the filter cover. The breathing holes 3 are communicated with the filter cavity 2, and blind hole valve cores 4 are arranged inside the breathing holes.

[0006] Preferably, when the fluid pressure is below 280 psi, the thickness of the blind hole valve core 4 is below 1 mm.

[0007] Preferably, when the volume of the filter cavity 2 is less than 10 ml, the number of the breathing holes 3 is four. At this time, the number of the fixing holes 7 corresponds to the breathing holes and is also four.

[0008] Further preferably, when the volume of the filter cavity 2 is greater than 10 ml and less than 200 ml, the number of the breathing holes 3 is six. At this time, the number of the fixing holes 7 corresponds to the breathing holes and is also six.

[0009] Preferred technical solution: when the volume of the filtering cavity 2 is less than 10 ml, the number of the buffer film positioning grooves 6 is set to one, and the shape of the buffer film positioning groove 6 is a circular V-shaped groove, which is concentric with the axis line 8 of the filtering cavity and has a diameter larger than the arc-shaped filtering cavity opening 5.

[0010] Further preferably, when the volume of the filtering cavity 2 is greater than 100 ml, the buffer film positioning grooves 6 are two V-shaped grooves with different concentric diameters.

[0011] Further preferably, when the filtering cover 1 works under a fluid pressure above 280 psi, the buffer film positioning grooves 6 are set to two V-shaped grooves, and the number of the buffer film positioning grooves 6 is set to three or more in high-pressure working conditions.

[0012] Further preferably, according to the application working conditions and fluid pressure, the buffer film positioning grooves 6 can be changed into semi-circular grooves and square grooves to adapt to complex fluid working conditions.

[0013] Preferred technical solution: the filtering cover 1 is an integrally formed structure, and under specific working conditions and process requirements, it can be set as a split structure composed of multiple components.

[0014] Further preferably, the filtering cover 1 is assembled with the filtering flange 16 and two pulse buffer films 11, and can be combined into a filtering cover with a double-layer buffer film and a double-layer filtering cavity, which will more effectively improve the filtering efficiency and safety under specific working conditions.

[0015] The filtering cover provided by the present utility model has the following beneficial effects.

[0016] 1. The innovation of the present utility model lies in the combination of the filtering cavity 2 with the uniformly distributed surrounding breathing holes 3 and the blind hole valve cores 4 in the breathing holes. By using the pulsating pressure of the fluid itself, the filtering cover 1 with breathing holes automatically adjusts the air pressure in the filtering cavity, solving the problem that the elastic limit value of the pulse buffer film 11 reaches the limit and fails when the pressure in the filtering cavity changes linearly in a wide range during operation, thereby achieving a more effective pulse suppression rate and a wider applicable range.

[0017] 2. The setting of the blind hole valve cores 4 in the breathing holes 3 solves the problem that the conventional fluid pulse rectifier cannot match the fluid pressure when the pressure changes in a wide range, and raises the pressure resistance applicable range of the filtering cover from 0 - 120 PSI to 700 PSI.

[0018] 3. The circumferentially uniformly distributed breathing holes, in the state of low-pressure through holes and when the pressure curve in the filtering cavity changes frequently, effectively avoid the filtering cavity being in an instantaneous vacuum state due to the reaction delay of the buffer film under high-frequency pulses, thereby not affecting the elastic limit value of the buffer film and ensuring the stability of filtering.

[0019] 4. In contrast, the breathing holes evenly distributed around the circumference are in the high-pressure blind hole state, which just takes advantage of the vacuum state of the filter cavity and compensates for the elastic limit value of the buffer film, thereby ensuring the stability of the filter.

[0020] 5. In different working scenarios, the blind hole valve core 4 can be opened according to different fluid pressures, thereby obtaining two states of the breathing hole being in a blind hole or a through hole without changing any other structure, while reducing the size of the equipment, thereby reducing the cost of the equipment and improving the applicability and operability of the equipment. Description of the drawings:

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 The top view of an embodiment of the filter cover of the utility model having six breathing holes.

[0023] Figure 2 It is a cross-sectional view of the filter cover of the utility model.

[0024] Figure 3 It is a partial enlarged view of the filter cover of the utility model.

[0025] Figure 4 It is a schematic diagram of assembling a buffer film of the filter cover of the utility model.

[0026] Figure 5 The utility model is a top view of an embodiment of the filter cover having four breathing holes.

[0027] Figure 6 The utility model relates to a filter cover with a double-layer filter cavity, which is a combination of the filter cover and the filter flange.

[0028] Figure 7 It is a comparison waveform of the blind hole (MK) state curve 13 and the through hole (TK) state curve 14 obtained by the utility model.

[0029] Figure numerals.

[0030] In the figure, 1 - filtering cover, 2 - filtering cavity, 3 - breathing hole, 4 - blind hole valve core, 5 - arc filtering cavity opening, 6 - buffer film positioning groove, 7 - fixing hole, 8 - axis line of the filtering cavity, 9 - top surface of the filtering cover, 10 - bottom surface, 11 - pulse buffer film, 12 - four - hole filtering cover, 13 - curve of the breathing hole in the blind hole (MK) state, 14 - curve of the breathing hole in the through - hole (TK) state, 15 - fluid pressure direction, 16 - filtering flange. Detailed implementation method:

[0031] As a preferred embodiment of the filtering cover of the fluid pulse rectifier of the present utility model, as Figure 1 , 2 shown, the filtering cover 1 includes: a filtering cavity 2, a breathing hole 3, a blind hole valve core 4, an arc filtering cavity opening 5, a buffer film positioning groove 6, a fixing hole 7, and a top surface 9 of the filtering cover.

[0032] Six breathing holes 3 are centered on the axis line 8 of the filtering cavity, evenly distributed around the filtering cavity 2 and lead to the filtering cavity 2. In the middle position of the six evenly - distributed breathing holes, a blind hole valve core 4 is provided. When the fluid pressure is below 280 psi, the thickness of the blind hole valve core 4 is set below 1 mm. The purpose of setting this blind hole valve core is to determine whether the filtering cavity 2 is in a multi - channel communication state with the atmosphere or in a completely closed state according to the working conditions. Because the thickness of the blind hole valve core 4 is set below 1 mm, only simple tools are needed to complete the operation of the through - hole (TK) state at the use site.

[0033] As Figure 3 shown, the blind hole valve core 4 can be set as a plane or a sphere according to different use working conditions and scenarios.

[0034] As Figure 4 shown, in the state of the filtering cover being assembled and used with other components, first, the pulse buffer film 11 is positioned on the buffer film positioning groove 6 and fixed to other fluid rectifier components through the fixing hole 7 with bolts. When working, the pulse pressure generated by the fluid is consistent with the fluid pressure direction 15 as Figure 4 shown. At this time, observe whether the output waveform reaches the required state through the pressure sensing system. Because the fluid working conditions are complex and diverse, affected by parameters such as temperature, viscosity, pressure, pulse frequency, instantaneous impact force, etc., so at this time, it can be determined whether to change the blind hole (MK) state of the breathing hole 3 to the through - hole (TK) state according to the actual output waveform state of the on - site fluid. When the breathing hole 3 is in the through - hole (TK) state, the filtering cavity 2 is connected to the top surface 9 of the filtering cover through the breathing hole 3 and is in a communication state with the atmosphere. This filtering cover can cooperate with both single - channel fluid pulse rectifiers and dual - channel fluid pulse rectifiers, and even can be adapted to multi - channel fluid pulse rectifiers in specific situations.

[0035] As Figure 5As shown, when the volume of the filtering cavity 2 is less than 10 ml, the number of the breathing holes 3 can be set to 4. At this time, the number of the fixing holes 7 corresponds to that of the breathing holes and is also 4. The diameter of the breathing holes 3 is 1 mm at this time. When the volume of the filtering cavity 2 is greater than 10 ml and less than 200 ml, the number of the breathing holes 3 is set to 6, and the diameter of the breathing holes 3 can be set to 1 - 4 mm at this time. When the volume of the filtering cavity 2 is greater than 200 ml, the number of the breathing holes 3 can be increased to 8, and the diameter of the breathing holes 3 can be set to 2 - 6 mm at this time.

[0036] When the diameter of the breathing holes 3 is greater than 2 mm, the breathing holes can be set as threaded holes, and standard bolts and sealing gaskets are used to replace the blind hole valve core 4. Adopting this structure facilitates the two-way conversion between the blind hole (MK) state and the through hole (TK) state.

[0037] As Figure 6 shown, the filtering cover 1 is assembled with the filtering flange 16 and two pulse buffer membranes 11, and can be combined into a filtering cover with a double-layer buffer membrane and a double-layer filtering cavity, which will more effectively improve the filtering efficiency and safety under specific working conditions. The filtering flange 16 is provided with buffer membrane positioning grooves on both sides, which are the same as those of the filtering cover 1, facilitating the sealing and fixing of the buffer membrane and the filtering cover. At this time, the two buffer membranes can be set with different materials and different thicknesses, and can be flexibly matched with various pulse conditions occurring in the actual working conditions, greatly improving the adaptability of the fluid pulse rectifier.

[0038] As Figure 7 shown, in order to verify the different effects of the breathing holes 3 in the blind hole (MK) state and the through hole (TK) state, the output end of the complete liquid peristaltic pump pipeline system of the fluid pulse rectifier equipped with the filtering cover 1 is connected to a pressure sensor, and normal-pressure liquid is pumped. After picking up two waveform signals in the blind hole (MK) state and the through hole (TK) state through the pressure sensor and amplifying and overlapping them, the Figure 7 shown comparative waveform is obtained. It can be clearly seen that Figure 7 in the curve 13 where the breathing hole is in the blind hole (MK) state, compared with Figure 7 the curve 14 where the breathing hole is in the through hole (TK) state, the amplitude is nearly 30% more. It can be seen that by setting the breathing holes 3 and the blind hole valve core 4 on the filtering cover 1, the output waveform effect of the fluid pulse rectifier is effectively improved, making the fluid state more tend to laminar flow.

[0039] Repeat the above operation, and adjust the pressure of the pumped liquid to 100 PSI. At this time, a completely opposite situation occurs. The liquid output pulse of the breathing hole in the blind hole (MK) state is better than that of the breathing hole in the through hole (TK) state in terms of the (MK) amplitude. It can be seen that at this time, the filtering cavity 2 in the vacuum state compensates for the elastic limit value of the buffer membrane, thus ensuring the stability of filtering.

[0040] The preferred specific embodiments and examples of the present utility model have been described and disclosed in detail above in conjunction with the accompanying drawings. However, the present utility model is not limited to the above embodiments and examples. Those skilled in the art will understand that various changes and settings can be made without departing from the concept of the present utility model, and it can be implemented in various ways without exceeding the scope described in the claims of the present invention. In addition, the content and drawings described herein are illustrative rather than restrictive.

Claims

1. A filter cover of a rectifier, characterized in that The middle part of the filtering cover (1) is a filtering cavity (2). An arc-shaped filtering cavity opening (5) is provided at the opening of the filtering cavity. Fixing holes (7) are evenly distributed around the axis line (8) of the filtering cavity. Breathing holes (3) are evenly distributed around the axis line (8) of the filtering cavity on the top surface (9) of the filtering cover. The breathing holes (3) are communicated with the filtering cavity (2), and a blind hole valve core (4) is arranged inside the breathing holes (3).

2. The filtering cover according to claim 1, wherein the filtering cavity (2) is in the shape of a dome.

3. The filtering cover according to claim 1, wherein a buffer film positioning groove (6) is provided on the outer edge of the arc-shaped filtering cavity opening (5).

4. The filtering cover according to claim 1, wherein the blind hole valve core (4) can be in two states: blind hole MK or through hole TK.

5. A filtering cover of a double-filtering cavity, characterized in that Assemble the filtering cover (1) according to any one of claims 1-4 above with a filtering flange (16) and two pulse buffer films (11) to form a filtering cover with a double-layer filtering cavity.

6. A fluid pulse rectifier, characterized in that, Use the filtering cover according to any one of claims 1-5 above.

7. A multi-channel fluid pulse rectifier, characterized in that, Use two or more filtering covers according to any one of claims 1-4 above.

8. A pump, characterized in that, Use a fluid pulse rectifier according to claim 6 above, or a multi-channel fluid pulse rectifier according to claim 7.

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