Piston pump with quick exhaust slide valve

Abstract

The present invention relates to an air-operated piston pump and its quick-exhaust slide valve, which can directly exhaust air from the piston chamber of the piston pump to the environment without passing through the main distributing valve, so that the temperature drop caused by the expansion of compressed air will not freeze the humidity of the air itself, clogging the compressed air circulation duct, and causing the pump to stop or stall. Such an air-operated piston pump with a quick-exhaust valve has fewer restrictions on the passage of air, improving the efficiency of the piston pump and reducing the consumption of compressed air compared to an identical air motor without a quick-exhaust valve.

Description

[Technical Field]

[0001] (Object of the invention) The present invention relates to a piston pump with a quick exhaust slide valve, which can directly exhaust air from each chamber to the atmosphere without having to exhaust air from the air piston chambers to the atmosphere through a path returning to the main distribution valve, thereby preventing ice buildup in the main air distribution control valve used in pneumatic reciprocating piston pumps.The use of a quick exhaust valve reduces the consumption of compressed air by directly exhausting the piston chambers to the atmosphere, thereby avoiding a large portion of the air flow, thereby reducing the air flow (or pressure drop) through the internal ducts of the engine, thereby improving the performance of the pump.

[0002] A primary application of this invention is in the industrial field of air-driven pumps for delivering fluids under pressure, such as hydrocarbons, chlorinated hydrocarbons, acids, bases, oils, greases, paints, varnishes, sealants, silicones, adhesives, and other chemicals used in industrial processes.

[0003] The quick exhaust slide valve invention can be incorporated for performance improvement, freeze protection, or size reduction, making it applicable to any type of pneumatic actuator, piston diaphragm pump, motor, or any compressed air system in a pneumatic circuit. [Background technology]

[0004] Many commercially available pneumatic piston pumps for pumping fluids have mechanisms that cannot reliably remove air from the air piston chamber without freezing the main air distribution valve under certain operating conditions, such as medium / high pressure, continuous operation, or compressed air that is not sufficiently dry.

[0005] This rapid expansion of the compressed air can cause the temperature inside the motor, and therefore the temperature inside the main air distribution valve, to fall below the freezing point of moisture present in the compressed air, resulting in the formation of ice. Under continuous operation, the ice can block the air passages, causing the piston pump of the pneumatic pump to stop or stall. Some commercially available models have a mechanism to prevent the outlet temperature from falling below the freezing point. This is achieved by controlling the leakage of compressed air from the inlet to the outlet of the main air distribution valve, taking advantage of the fact that compressed air is warmer than air at atmospheric pressure. This method results in excessive air consumption, and under certain circumstances, such as continuous operation under high pressure, the supplied energy may be insufficient, causing the main air distribution valve to freeze. The person in question is unaware of any pneumatic fluid-transfer piston pump that uses a quick-release valve to directly vent the air from the air piston chamber to the environment, preventing the air from flowing back into the main air distribution valve and freezing, resulting in pump slowdown and stall.

[0006] The quick exhaust slide valve proposed in this invention is novel and solves and improves two problems of existing quick exhaust valves. First, the sliding design reliably guides the moving elements, eliminating the possibility of misalignment of the moving elements. Second, the cross section of the compressed air passage can be enlarged, reducing pressure loss and improving valve performance compared to existing valve designs of the same size.

[0007] In its current configuration, there are no known quick exhaust valves applied to pneumatic piston pumps. Summary of the Invention

[0008] The air motor that drives the piston pump separates the two air chambers that make up the pump and has a power piston that moves alternately from one air chamber to the other, moving the pump. The air motor also has a compressed air inlet to a main air distributor valve, which alternately supplies compressed air to the air piston chambers to assist the reciprocating motion when activated by an end-of-stroke sensor. A quick exhaust valve is located in the communication port between the two air piston chambers and is intended to exhaust compressed air from the piston chamber of the piston pump without passing through the motor's main compressed air distributor valve.

[0009] Each air-driven piston pump requires two quick-exhaust valves: one to exhaust air from the upper air piston chamber and the other to exhaust air from the lower air piston chamber. This way, both chambers have their own valves to directly exhaust air to the outside, eliminating the need for the exhausted air to pass through the main air distribution valve. This prevents sudden expansion of the compressed air from forming ice in the main distribution valve, which could interfere with normal operation and ventilation, and also reduces pressure loss due to the extraction of compressed air from the motor to the atmosphere. The quick-exhaust valve with sliding system has a moving element with dual functions. First, when in the air inlet position, it allows air to enter the corresponding air piston chamber. Second, when in the air exhaust position, it allows air from the air piston chamber to escape directly to the atmosphere through the pump's silencer system, thus preventing the air from returning to the main distribution valve before being released into the environment.

[0010] The present invention comprises a piston pump and two quick exhaust valves with slide mechanisms, each of which comprises the following: A movable part. This movable part may consist of a single piece of elastic material or may be an assembly consisting of a rigid structure and two elastic sealing elements attached to it. This movable part alternates between two positions depending on whether compressed air is entering or leaving the air piston chamber, closing the corresponding air port (either the air port communicating with the main distributing valve or the air port communicating with the atmosphere) and opening the other. Fixed sleeve: The sleeve consists of a rigid part that houses and guides the moving part and provides a sealing layer for the air passage port to atmosphere. A housing that houses the moving parts and the fixed cylinder sleeve. In the case of a piston air motor, this may be part of the motor construction to achieve the compactness needed to achieve the same performance as a conventional exhaust valve, allowing the motor construction to be made smaller or the same size while still achieving better pneumatic performance.

[0011] The present invention improves upon existing quick exhaust valves by eliminating an obstruction in the air passage from the main air distributor valve to the air piston chamber. This is achieved by having a longer-than-normal moving part that allows it to seal against the outer surface of the geometric space between the air piston chamber port and the main distributor valve port. Furthermore, because the sleeve and moving part are prismatic, the moving part is always guided by the sleeve, avoiding the possibility of misalignment that can lead to erratic operation and failure, as can occur with existing valves.

[0012] This piston pump with quick exhaust valve is applied to an air-driven reciprocating piston pump for fluid transfer. The piston pump with quick exhaust valve allows air stored in the air piston chamber of the piston pump's air motor to be directly exhausted to the environment without passing through the motor's internal duct or main air distribution valve and without freezing. This prevents ice from forming in the motor's air duct and main distribution valve, which can cause the piston pump to stop and stall. Meanwhile, this arrangement of the quick exhaust valve minimizes pressure loss in the motor's working air circuit, increasing motor efficiency and reducing compressed air consumption.

[0013] The piston pump (Fig. 1a) consists of: -Compressed air inlet connection (1) -Main air distribution valve (2) -Two piston limit switch sensors (3a and 3b) - Air piston chambers (4a and 4b) -Quick exhaust slide valve (5a and 5b) -Pneumatic piston pump silencer system(6) -Air chamber piston (7)

[0014] The quick exhaust valve with slide mechanism (Fig. 4a) consists of the following: -Compressed air inlet port (7) -Air outlet port to atmosphere (8) -Air motor port (9) -Moving part of quick exhaust slide valve (10) - Fixing part of quick exhaust slide valve (11) -Quick Exhaust Slide Valve Body / Housing(12) [Brief explanation of the drawings]

[0015] [Figure 1a] The pneumatic circuit diagram of an air-driven piston pump with a quick exhaust valve and slide mechanism is shown below. [Figure 1b] FIG. 1 shows a longitudinal cross-sectional view of an air-driven piston pump with a quick exhaust valve and a slide mechanism. [Figure 2] FIG. 1 shows the pneumatic circuit diagram of a downward-acting air-driven piston pump with quick exhaust valve and slide mechanism. [Figure 3] FIG. 1 shows the pneumatic circuit diagram of an upwardly operating air-driven piston pump with a quick exhaust valve and slide mechanism. [Figure 4a] A diagram of the air inlet port, air outlet port, motor port, moving part, fixed part, and quick exhaust valve with housing is shown. [Figure 4b] A longitudinal cross-sectional view of the quick exhaust valve with air inlet port, air outlet port, motor port, moving part, fixed part, and housing is shown. [Figure 5] 1 shows a view of the quick exhaust slide valve in the air release position. [Figure 6] FIG. 1 shows a view of the quick exhaust slide valve in the air inlet position. DETAILED DESCRIPTION OF THE INVENTION

[0016] Figure (Figure 1a) is an operational diagram of the piston pump air motor, shown in cross section in Figure (1b), showing all component systems in position to fill the upper piston chamber (4a) and empty the lower piston chamber (4b).

[0017] When the main air distribution valve (2) is in the lower position (Figure 2), it sends compressed air to the air inlet of the upper quick exhaust valve (5a) and connects the air inlet of the lower quick exhaust valve (5b) to the atmosphere. Dynamic air pressure positions the movable part of the upper quick exhaust valve (5a) to allow air to flow into the upper air piston chamber (4a) and the movable part of the lower quick exhaust valve (5b) to exhaust air from the lower air piston chamber (4b) to the atmosphere through the silencer (6), preventing the exhaust air from returning to the main distribution valve (2) and protecting it from temperature drops and freezing. Because the upper air piston chamber (4a) is supplied with compressed air and the lower air piston chamber (4b) is connected to the atmosphere, the air piston chamber (7) moves downward.

[0018] When the air chamber piston (7) reaches the end of its down stroke, the end of down stroke sensor (3b) is activated by the air piston (7) and the main distributor valve (2) switches to the upper position as shown in the diagram (Figure 3).

[0019] When the main air distributor valve (2) is in the upper position (Figure 3), it sends compressed air to the air inlet of the lower quick exhaust valve (5b) and connects the air inlet of the upper quick exhaust valve (5a) to the atmosphere. Dynamic air pressure positions the movable part of the lower quick exhaust valve (5b) to allow air to pass through the lower air piston chamber (4b) and the movable part of the upper quick exhaust valve (5a) to exhaust air from the upper air piston chamber (4a) to the atmosphere through the silencer (6), preventing the exhaust air from returning to the main distributor valve (2) and protecting it from temperature drops and freezing. Because compressed air is supplied to the lower air piston chamber (4b) and the upper air piston chamber (4a) is connected to the atmosphere, the air piston moves upward.

[0020] The limit switch sensors (3a and 3b) may be of any type for actuating the main distributing valve (2) and may have any type of sensing technology, such as pneumatic, electrical, or mechanical. These sensors may be separate elements attached externally to the motor or may form a built-in part of the motor itself.

[0021] The diagram (Fig. 4b) shows a cross-sectional view of a quick exhaust valve with a sliding mechanism, the housing of which is part of one of the piston pump sections.

[0022] The quick exhaust slide valves (5a, 5b) have two operating positions that alternate in response to changes in the position of the main air distribution valve (2).

[0023] One of these two positions, the air exhaust position (Figure 5), occurs when there is no compressed air in the compressed air inlet port (7). This occurs because the main distributor valve (2) is in a position that connects the port (7) of the quick exhaust valve in question to the atmosphere. In this position, the air piston chamber (4a or 4b) to which the quick exhaust slide valve (5a or 5b) is connected contains compressed air that must be vented to the atmosphere. The compressed air enters the quick exhaust slide valve through the air motor port (9), and the dynamic air pressure pushes the moving part (10) to close the compressed air inlet port (7). When the moving part (10) is in this position, the air outlet port (8) to the atmosphere remains open, allowing the compressed air in the piston chamber (4a or 4b) to be vented to the atmosphere.

[0024] Another operating position of the quick exhaust slide valve (5a, 5b) is when the air inlet is shown in the diagram (Fig. 6) and compressed air is present at the compressed air inlet port (7), since the main distributor valve (2) is positioned to communicate air pressure to this quick exhaust slide valve (5a or 5b).

[0025] In this position, compressed air at the air inlet port (7) pushes the moving part (10), and the dynamic pressure of the air positions the moving part (10) to maintain the position shown in the image (Fig. 6), elastically deforming the flexible elements of the moving part to allow air to pass through. In this way, compressed air flows to the air motor through the motor port (9), and at the same time, the moving part (10) closes the air outlet port to the atmosphere (8).

[0026] The passage of the movable part (10) from one position to another is always a guided linear movement, since part of the movable part (10) remains inside the fixed part (11) in the form of a prismatic or sliding system with little play between the two parts to ensure a guiding effect, thereby avoiding misalignment of the movable part (10) which could result in malfunction due to a faulty or deteriorated seal (10).

Claims

1. 1. A piston pump with quick exhaust slide valves, characterized by: a single piston in the air chamber that separates the piston chambers by reciprocating motion; and two quick exhaust valves, one in each air piston chamber, that prevent the air from being exhausted from the air piston chambers through the main air distribution valve by means of a slide mechanism, thereby allowing the air to be exhausted directly into the environment and avoiding freezing, The air may be: At least one compressed air inlet connection (1) At least one main air distribution valve (2) At least two piston limit switch sensors (3a and 3b) Air piston chambers (4a and 4b) At least two quick exhaust slide valves (5a and 5b) At least one pneumatic piston pump silencer system (6) Air chamber piston (7) directly into the environment through the main exhaust system of the piston pump, a quick exhaust slide valve having a guided sliding or moving part, which on the one hand allows air to enter the air piston chamber and on the other hand exhausts air from the air piston chamber directly to the environment via the main exhaust system of the pump when the stroke is reversed; The quick exhaust valve comprises a movable part, a fixed sleeve, and a rectangular columnar slide system with a housing, and the movable part moves linearly guided by the fixed part; the valve has three ports, one of which is always open and the other two of which are closed by the movable part in each of its operating positions; the movable part is displaced by the dynamic pressure of the compressed air depending on whether the compressed air reaches one port or the other port; - a compressed air inlet port (7); an air outlet port (8) to atmosphere; - Air motor port (9); - a movable part (10) of the quick exhaust slide valve; - a fixing part (11) of the quick exhaust slide valve; - quick exhaust slide valve body / housing (12); A piston pump with a quick exhaust slide valve.

2. 2. The piston pump with quick exhaust slide valve according to claim 1, wherein the quick exhaust valve is an independent accessory externally connected to the piston pump, and these accessories can be used in any pneumatic system as an independent quick exhaust valve.

3. 2. The piston pump with quick exhaust slide valve according to claim 1, wherein said quick exhaust mechanism is electronically operable.

4. the movable part of the valve elastically deforms and contracts when receiving air under pressure from a convex side, allowing the compressed air to pass through, and elastically deforms and expands when receiving the compressed air from a concave side, and has a portion of a flexible and elastic material that fills the entire cylindrical cross section of the housing; 2. The piston pump with quick exhaust slide valve according to claim 1, wherein the elastic portion of the housing (casing) exerts the necessary thrust to move the movable portion until the movable portion abuts against the housing (casing), thereby sealing the air inlet port of the valve.

5. 5. The piston pump with quick exhaust slide valve according to claim 4, wherein the moving element has a portion of flexible and elastic material disposed in the area that contacts the fixed element in one of the operating positions, sealing the air outlet port of the valve.

6. 6. The piston pump with quick exhaust slide valve according to claim 4, wherein the movable part has the two flexible parts assembled by joints or bolted to a structure made of a rigid material such as metal or plastic.

7. 7. A piston pump with a quick exhaust slide valve according to claims 2, 4, 5 and 6, characterized in that the movable part is made entirely from a single piece of flexible and elastic material.

8. 2. The piston pump with quick-exhaust slide valve according to claim 1, characterized in that the valves themselves are integrated into the pneumatic actuator which they actuate, and therefore the quick-exhaust valve housing is not a separate part but is part of one of the parts of the actuator having a housing into which the movable part and the fixed part of the quick-exhaust valve are inserted.

9. 2. The piston pump with quick exhaust slide valve according to claim 1, wherein the design of the valve prevents the possibility of the moving element being displaced by ensuring the guiding of the moving part, thereby allowing the moving element to have a longer moving distance and the cross section of the compressed air passage to be increased, thereby reducing load losses and improving the performance of the valve compared to current existing designs of the same size that require a shorter moving distance to prevent the moving part from being unguided and displaced, resulting in leakage and / or malfunction.

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