Shuttle valve for reciprocating diaphragm pump and reciprocating diaphragm pump

Abstract

According to the shuttle valve for the reciprocating diaphragm pump and the reciprocating diaphragm pump, the shuttle valve element of the shuttle valve is matched with the maintaining assembly, the stability of the shuttle valve element at the preset position can be improved, and even if the shuttle valve element slightly deviates from the preset position due to the influence of external vibration or instability of an air source, the shuttle valve element cannot be damaged. The supporting piece and the elastic piece can provide force for the shuttle valve element to return to the preset position, so that mistaken reversing of the shuttle valve element caused by external vibration of the shuttle valve element or instability of an air source and leakage of a small amount of air is prevented, and stable conduction of a corresponding air path and an air chamber is guaranteed; in addition, when the shuttle valve element is subjected to position switching, additional axial pushing force can be provided, the axial moving speed of the shuttle valve element is increased, inflation switching of the first air chamber and the second air chamber can be rapidly and accurately achieved, and the requirement for efficient response is met.

Description

Technical Field

[0001] This invention relates to the field of actuator technology, and in particular to a shuttle valve for a reciprocating diaphragm pump and a reciprocating diaphragm pump. Background Technology

[0002] A diaphragm pump is a positive displacement pump that transports liquids by changing the volume of its working chamber through the reciprocating deformation of a diaphragm. It includes pneumatic diaphragm pumps, hydraulic diaphragm pumps, and electric diaphragm pumps. A pneumatic diaphragm pump consists of a pneumatic section, a fluid section, and two opposing chambers. Each chamber is divided into an air chamber and a liquid chamber by a diaphragm. The air chamber is connected to the pneumatic section, and the liquid chamber is connected to the fluid section. A pump shaft connects the two diaphragms. The pneumatic diaphragm pump achieves the regular flow of fluid by utilizing the power of compressed air and the reciprocating motion of the diaphragm.

[0003] The working process of an existing pneumatic diaphragm pump can be divided into two stages. For ease of description, the air chamber is divided into a first air chamber and a second air chamber, and the liquid chamber is divided into a first liquid chamber and a second liquid chamber. In the first stage, gas enters the first air chamber, expands, and squeezes the first liquid chamber through the diaphragm to discharge liquid. At the same time, the pump axis moves to the second liquid chamber, and the second air chamber contracts to enlarge the second liquid chamber and draw in liquid. In the second stage, gas enters the second air chamber, expands, and squeezes the second liquid chamber to discharge liquid. At the same time, the pump axis moves to the first liquid chamber, and the first air chamber contracts to enlarge the first liquid chamber and draw in liquid. A gas flow path switching is required between the first and second stages to achieve circulation.

[0004] Since pneumatic diaphragm pumps have two air chambers and corresponding gas flow paths, achieving the switching of air intake between the two air chambers is a prerequisite for ensuring the normal operation of the pneumatic diaphragm pump. Existing gas flow path switching is based on detection signal control of the switching valve, which relies on an external air source to switch directions and maintain various positions. However, the air source may be unstable or subject to pump body vibration, causing the switching valve to fail to maintain the corresponding position, thus affecting the pump's performance. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a shuttle valve for a reciprocating diaphragm pump and a reciprocating diaphragm pump, thereby solving the problem that the existing shuttle valve for a reciprocating diaphragm pump cannot be maintained in the corresponding position due to the influence of the air source.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A shuttle valve for a reciprocating diaphragm pump is disclosed, wherein the reciprocating diaphragm pump includes a first air chamber and a second air chamber disposed opposite to each other, a first air passage for introducing air into the first air chamber, and a second air passage for introducing air into the second air chamber.

[0008] The shuttle valve includes a shuttle valve core capable of axial movement and a retaining assembly that cooperates with the shuttle valve core.

[0009] The retaining assembly includes a connecting rod, an elastic element, and a support element. The connecting rod is axially limited and connected to the shuttle valve core. The elastic element is fixedly disposed axially on the connecting rod. The support element has a first end movably disposed on the connecting rod and a second end movably disposed on the elastic element.

[0010] The support member has a first inclined position and a second inclined position relative to the connecting rod; when the support member is in the first inclined position, the first air passage can communicate with the first air chamber, and the second air passage is isolated from the second air chamber; when the support member is in the second inclined position, the second air passage can communicate with the second air chamber, and the first air passage is isolated from the first air chamber.

[0011] A first angle range and a second angle range are formed between the first tilt position and the second tilt position. When the support member is located in the first angle range, the elastic member provides a force to the support member to move in the direction of the first tilt position. When the support member is located in the second angle range, the elastic member provides a force to the support member to move in the direction of the second tilt position.

[0012] The shuttle valve core, at different axial positions, can respectively open the first air passage and the first air chamber, and close the second air passage and the second air chamber, as well as open the second air passage and the second air chamber, and close the first air passage and the first air chamber. Based on existing technology, the axial movement and stopping of the shuttle valve core can rely on the gas action of the gas source; that is, the gas source can act on both ends of the shuttle valve core axially to apply an axial force. When the gas force at one end of the shuttle valve core is less than the gas force at the other end, the shuttle valve core will move towards the end with the smaller gas force and remain in a preset position under the gas force at the other end. However... If the gas pressure of the gas source is unstable, the axial force exerted on the shuttle valve core will be unstable, causing the shuttle valve core to deviate from the preset position. The shuttle valve of the present invention adds a retaining component based on the prior art, and the retaining component can also apply an axial force to the shuttle valve core, so that the shuttle valve core is maintained in the preset position or switches between different positions. That is, in addition to moving or stopping axially under the action of the gas from the gas source, the shuttle valve core will also move or stop under the action of the retaining component. The retaining component and the gas action direction of the gas source are consistent, thereby ensuring the stability of the shuttle valve core in the preset position and the speed of switching between different positions.

[0013] Specifically, when the support is in the first inclined position, the support and the elastic element apply an axial force to the first end of the shuttle valve core through the connecting rod, keeping the shuttle valve core in a preset position and opening the first air passage and the first air chamber while blocking the second air passage and the second air chamber. When it is necessary to switch air chambers, the force exerted by the gas on the second end of the shuttle valve core is greater than the force exerted by the support and the elastic element on the first end of the shuttle valve core through the connecting rod. The shuttle valve core moves towards the first end, simultaneously moving the connecting rod and changing the inclined position of the support. The support crosses the critical position between the first and second angle intervals. Subsequently, the elastic element provides a force to the support member to move towards the second inclined position, which in turn drives the shuttle valve core to move rapidly towards the first end via the connecting rod. Under the action of gas pressure and the elastic force of the elastic element, the shuttle valve core can reach the preset position corresponding to the first end more quickly, opening the second air passage and the second air chamber, and blocking the first air passage and the first air chamber. Compared with the prior art that simply relies on gas force to push the shuttle valve core, the shuttle valve core of the present invention moves faster during switching, and the support member is maintained in the second inclined position under the action of the elastic element to overcome the inability of the shuttle valve to remain in place due to unstable airflow and pump vibration. Corresponding position situation; when the reciprocating diaphragm pump needs to switch gas chambers again, the force exerted by the gas on the first end of the shuttle valve core is greater than the force on the second end of the shuttle valve core. The shuttle valve core moves towards the second end, simultaneously driving the connecting rod to move. The tilt position of the support changes. After the support crosses the critical position between the second angle range and the first angle range, the elastic element provides a force to the support to move towards the first tilt position. This, in turn, drives the shuttle valve core to move rapidly towards the second end through the connecting rod. Under the action of gas pressure and the elastic force of the elastic element, the shuttle valve core can reach the second end more quickly. The first air passage and the first air chamber are connected at the preset position, while the second air passage and the second air chamber are disconnected. Compared with the prior art that relies solely on gas force to push the shuttle valve core, the shuttle valve core of the present invention moves faster during switching, and the support member is maintained in the first inclined position under the action of the elastic member. Together with the gas, it applies an axial force towards the second end to maintain the shuttle valve core in the preset position corresponding to the second end. Compared with the prior art that relies solely on gas force to hold the shuttle valve core, the shuttle valve core of the present invention can be maintained more stably in the preset position, maintaining a stable connection between the first air passage and the first air chamber.

[0014] In summary, the shuttle valve core and retaining assembly of the present invention not only improve the stability of the shuttle valve core in the preset position, but also ensure that even if the shuttle valve core is slightly deviated from the preset position due to external vibration or unstable gas source, the support and elastic components will provide the shuttle valve core with a force to return to the preset position, preventing the shuttle valve core from being mistakenly switched due to external vibration or unstable gas source and a small amount of gas leakage, thus ensuring stable conduction between the corresponding gas path and the gas chamber; it can also provide additional axial pushing force when the shuttle valve core is switching positions, increasing the axial movement speed of the shuttle valve core, thereby achieving rapid switching.

[0015] Preferably, the connecting rod is provided with a first slot, the first end of the support member is movably engaged in the first slot, and the maximum thickness of the first slot is greater than the maximum thickness of the first end of the support member.

[0016] The support needs to switch between a first tilt position and a second tilt position. The installation relationship between the support and the connecting rod is different in the first angle range and the second angle range. Therefore, the maximum thickness of the first slot needs to meet the sum of the first angle range and the second angle range, and be greater than the maximum thickness of the first end of the support, so as to provide the first end of the support with the activity space in the first slot when switching the tilt angle, and ensure that the support can switch flexibly between the first tilt position and the second tilt position.

[0017] Preferably, the first slot includes a first limiting wall and a second limiting wall that are axially opposite to each other on the connecting rod, and the first limiting wall and the second limiting wall have opposite inclination directions.

[0018] The functions of the first and second limiting walls are as follows: On the one hand, they are inclined in different directions, making the first slot form a funnel shape with a larger outer side and a smaller inner side, which increases the maximum thickness of the first slot and provides the space required for the support to change its inclination direction; on the other hand, the first limiting wall can serve as the abutment position of the support at the first inclination position, and the second limiting wall can serve as the abutment position of the support at the second inclination position, that is, to provide support and limit the support at different angle positions, so that the force of the support is accurately transmitted to the connecting rod and the shuttle valve core, so as to maintain the position of the shuttle valve core or drive the shuttle valve core to move axially.

[0019] Preferably, the first slot includes a first groove and a limiting block located at the circumferential center of the first groove. The first end of the support member is provided with an insert groove, which is engaged with the limiting block to restrict the circumferential movement of the first end of the support member relative to the connecting rod.

[0020] When the support member switches between the first tilt position and the second tilt position, the support member will radially offset relative to the connecting rod. The limiting block cooperates with the groove to restrict the circumferential position of the first end of the support member in the first slot, preventing the first end of the support member from sliding out from the side of the first slot and disengaging from the connecting rod. This would prevent the force of the support member and the elastic member from being transmitted to the shuttle valve core, thus preventing the component from playing its due role. This setting ensures the stability of the support member and limits the radial offset of the support member to a reasonable range, thereby achieving precise force transmission.

[0021] Preferably, the two first slots are connected in the circumferential direction of the connecting rod, and the depth of the slot is greater than the radial length of the limiting block.

[0022] When the support member switches between the first tilt position and the second tilt position, the support member will radially offset relative to the connecting rod, and the position of the first end of the support member relative to the connecting rod will also change. The two first slots are circumferentially connected, providing space for the first end of the support member to move radially in the direction of the connecting rod when it moves radially. At the same time, the depth of the slot is greater than the radial length of the limiting block, so that the first end of the support member can move radially in the direction of the other first slot in the direction of the connecting rod, thereby providing more space for the first end of the support member to move radially, avoiding the support member getting stuck when switching tilt directions, and facilitating the support member to change tilt direction and cross critical positions.

[0023] Preferably, the inner wall of the elastic member is provided with a second groove for movably engaging with the second end of the support member, and the axial thickness of the second groove is greater than the thickness of the second end of the support member.

[0024] With this configuration, the first and second ends of the support member are respectively limited by the connecting rod and the elastic element to control the movement direction of the support member within the radial direction of the connecting rod and the elastic element. This ensures that the support member can stably transmit the force of the elastic element to the connecting rod. Similarly, the second end of the support member is movably engaged with the second slot. The support member needs to switch between the first tilt position and the second tilt position. The first tilt position and the critical position of the support member form a first angle interval, and the critical position and the second tilt position form a second angle interval. The first angle interval and the second angle interval occupy different spaces. Therefore, the maximum thickness of the second slot needs to satisfy the sum of the first angle interval and the second angle interval, and be greater than the maximum thickness of the second end of the support member, so as to provide the second end of the support member with movement space in the second slot when switching tilt angles, ensuring that the support member can flexibly switch between the first tilt position and the second tilt position.

[0025] Preferably, one side of the elastic member has an expandable opening, and the circumferential width of the second slot is greater than the circumferential width of the second end of the support member.

[0026] With this configuration, the elastic element can undergo circumferential deformation, thereby applying a compressive force (i.e., preload) to the inner support element. Specifically, when the support element switches between the first and second inclined positions, both the first and second ends of the support element will undergo radial displacement of the connecting rod. The second end of the support element abuts against the second slot of the elastic element. When the second end moves radially, it will also push the elastic element to move radially away from the connecting rod, thereby causing the elastic element to expand and the opening to become larger. Based on the tendency of the elastic element to maintain its own shape, the elastic element will apply a compressive force to the support element, which is decomposed into an axial force based on the direction of the support element. When the support element crosses the critical position, it will quickly reach the first or second inclined position, achieving rapid switching. When the elastic element undergoes circumferential deformation, the second end of the support element is equivalent to undergoing circumferential displacement with the second slot. Therefore, the circumferential width of the second slot is greater than the circumferential width of the second end of the support element to provide room for movement of the second end of the support element and prevent the support element from getting stuck when switching the inclination angle.

[0027] Preferably, the shuttle valve for the reciprocating diaphragm pump further includes a shuttle valve housing, in which the shuttle valve core is installed. The first air path includes a first air distribution path and a first air inlet path, and the second air path includes a second air distribution path and a second air inlet path. The shuttle valve housing is circumferentially provided with a first set of connecting holes corresponding to the first air distribution path, a second set of connecting holes corresponding to the first air inlet path, a third set of connecting holes corresponding to the second air distribution path, and a fourth set of connecting holes corresponding to the second air inlet path, arranged sequentially along the axial direction.

[0028] The shuttle valve core includes at least one communicating cavity and at least two blocking portions, wherein the communicating cavity is located between two adjacent blocking portions.

[0029] When the support is in the first inclined position, the first group of connecting holes and the second group of connecting holes are exposed and connected in the same connecting cavity, and the blocking part blocks at least one of the third group of connecting holes and the fourth group of connecting holes;

[0030] When the support is in the second inclined position, the third group of connecting holes and the fourth group of connecting holes are exposed and connected in the same connecting cavity, and the blocking part blocks at least one of the first group of connecting holes and the second group of connecting holes.

[0031] The shuttle valve core connects or disconnects the air chamber and the air path by dividing the air path into two parts: a distribution air path and an intake air path. The distribution air path is always open to the air source, and the intake air path is always open to the air chamber. When the connecting cavity of the shuttle valve core is connected to the first set of connecting holes corresponding to the first distribution air path and the second set of connecting holes corresponding to the first intake air path, the first distribution air path and the first intake air path are connected, allowing the air source to connect to the first air chamber through the first air path and inflate the first air chamber. At the same time, the blocking part of the shuttle valve core blocks at least one of the third set of connecting holes and the fourth set of connecting holes, thus disconnecting the second distribution air path and the second intake air path, and the second air path and the second air chamber are in a disconnected state. Similarly, when the connecting cavity of the shuttle valve core is connected to the third set of connecting holes corresponding to the second air distribution path and the third set of connecting holes corresponding to the second air intake path, the second air distribution path and the second air intake path can be connected, so that the air source can be connected to the second air chamber through the second air path to inflate the second air chamber. At the same time, the blocking part of the shuttle valve core blocks at least one of the first set of connecting holes and the second set of connecting holes, so that the first air distribution path and the first air intake path are isolated, and the first air path and the first air chamber are in an isolated state. Based on the above structure, the tilt state of the support member is corresponding to the position of the shuttle valve core, so that the support member can assist the shuttle valve core in positioning in a preset position and maintain the connection between the corresponding air path and the air chamber. By setting corresponding connecting holes on the shuttle valve housing and allowing the shuttle valve core to move axially within the housing, the following advantages are achieved: Firstly, the shuttle valve housing and core can be made of different materials than the pump housing, making them more wear-resistant. Furthermore, after long-term use, if a fault or wear occurs, the shuttle valve housing can be directly replaced, resulting in lower costs and easier maintenance. Secondly, the shuttle valve can also increase the sealing area with the core, improving the sealing effect, ensuring the independence of each set of connecting holes, and preventing gas leakage to other gas paths.

[0032] Preferably, the shuttle valve for the reciprocating diaphragm pump further includes a mounting housing for fixed connection with the reciprocating diaphragm pump, the mounting housing being in sealing contact with the shuttle valve housing, and the connecting rod being at least partially located within the mounting housing.

[0033] The function of the mounting housing is to install and retain the assembly, fixing it onto the reciprocating diaphragm pump. The mounting housing and the shuttle valve housing are in a sealed contact, and the interior of the mounting housing is in a communication state with the interior of the shuttle valve housing, allowing the connecting rod to move axially between the mounting housing and the shuttle valve housing. This transmits the axial force of the elastic element and the support element to the shuttle valve core, ensuring that the retaining assembly can maintain the position of the shuttle valve core and enable rapid switching.

[0034] Preferably, the mounting housing is provided with a vent hole, and a vent gap is provided between the outer wall of the connecting rod and the inner wall of the mounting housing. The outer diameter of the connecting rod is smaller than the outer diameter of the end face of the shuttle valve core, so as to expose part of the end face of the shuttle valve core. The vent gap connects the vent hole and one axial end of the shuttle valve core, so that gas can act on the axial end face of the shuttle valve core.

[0035] Based on the above description, the air source needs to supply air to both ends of the shuttle valve core in order to apply axial force. The function of the vent hole on the mounting housing is to supply air to the air source. Then the air flows through the vent gap to the end of the shuttle valve core and acts on the axial end of the shuttle valve core that is not covered by the connecting rod, i.e., the first end face, to apply axial force to the shuttle valve core.

[0036] To achieve the above objectives, the present invention also employs the following technical solution:

[0037] A reciprocating diaphragm pump includes a main module, a first pump housing and a second pump housing located on both sides of the main module, diaphragms respectively sealed and sandwiched between the main module and the first and second pump housings, and a cooperating component disposed on the main module; one diaphragm forms a first air chamber with the first pump housing and a first liquid chamber with the main module, and the other diaphragm forms a second air chamber with the second pump housing and a second liquid chamber with the main module; the main module is provided with an inlet flow path and an outlet flow path, the first liquid chamber and the second liquid chamber are unidirectionally connected to the inlet flow path and the outlet flow path respectively, and the cooperating component is used to enable the two diaphragms to move cooperatively;

[0038] It also includes an intake airflow path connected to the air source, the intake airflow path including a first airflow path corresponding to the first air chamber and a second airflow path corresponding to the second air chamber.

[0039] It also includes the shuttle valve mentioned above, which is disposed on the air intake path. When the support member is in the first inclined position, the first air path can communicate with the first air chamber, and the second air path is isolated from the second air chamber; when the support member is in the second inclined position, the second air path can communicate with the second air chamber, and the first air path is isolated from the first air chamber.

[0040] The reciprocating diaphragm pump of the present invention employs the aforementioned shuttle valve. Based on the retaining component in the shuttle valve, the shuttle valve core can be more stably maintained in a preset position, opening the corresponding air path and air chamber. Simultaneously, when switching air chambers, the shuttle valve core can also move quickly and accurately to the next preset position. Specifically, the preload of the elastic element in the retaining component and the rigid force transmission of the support component ensure that the shuttle valve core remains in the preset position. When the shuttle valve core switches positions, the tilt angle of the support component changes via the connecting rod, thereby changing the direction of the force acting on the connecting rod. During this process, the elastic element always provides a preload in the corresponding direction based on the angle range of the support component, i.e., based on... The tilt direction of the support component and the preload direction of the elastic component will also be different. The preload direction of the elastic component on the support component is different from the force direction of the shuttle valve core on the support component through the connecting rod. This makes it impossible for the support component to stay in the critical position, so that the support component can quickly cross the critical position and quickly change the tilt angle to the first tilt position or the second tilt position. Then, the force direction of the support component on the connecting rod is changed. Furthermore, the force of the elastic component and the support component on the connecting rod always has an axial component. The axial component is transmitted to the shuttle valve core through the connecting rod to drive the shuttle valve core to quickly reach the next preset position. This avoids the shuttle valve core from stopping in the middle during position switching, which would lead to intake switching failure.

[0041] Therefore, the reciprocating diaphragm pump of the present invention can improve the conductivity stability between the corresponding air path and the air chamber, and will not cause accidental connection or disconnection between the air path and the air chamber due to external vibration or unstable air source, small gas leakage, or mis-switching of the shuttle valve core. It can also quickly and accurately realize the inflation switching of the first air chamber and the second air chamber, meeting the requirements of high efficiency response.

[0042] Preferably, the shuttle valve is disposed on the first pump housing, and the first pump housing is provided with a mounting cavity;

[0043] It also includes a third limiting wall located on the mounting cavity or the shuttle valve housing of the shuttle valve and a fourth limiting wall located on the cover of the retaining assembly. When the support is in the first inclined position, the shuttle valve core abuts against the third limiting wall, and when the support is in the second inclined position, the connecting rod abuts against the fourth limiting wall.

[0044] The mounting cavity serves to provide space for installing the shuttle valve. When the shuttle valve does not include the shuttle valve housing, the mounting cavity also functions as the shuttle valve chamber, allowing the shuttle valve core to move axially within it. In this case, the mounting cavity has a third limiting wall, and the cover of the retaining assembly has a fourth limiting wall. When the shuttle valve includes the shuttle valve housing, the shuttle valve housing contains the shuttle valve chamber, and the shuttle valve core moves axially within the housing. In this case, either the shuttle valve housing or the mounting cavity has a third limiting wall, and the cover of the retaining assembly has a fourth limiting wall. The shuttle valve core and the connecting rod are located between the third and fourth limiting walls. When the shuttle valve core moves axially within the mounting cavity, contacting the third limiting wall results in a preset position at one end, connecting the first air passage and the first air chamber. Contacting the fourth limiting wall results in the shuttle valve core reaching a preset position at the other end, connecting the second air passage and the second air chamber. Simultaneously, the support member is in an inclined state, providing continuous support to the shuttle valve core to maintain its stability in the two preset positions.

[0045] Preferably, the mounting cavity forms a shuttle valve cavity for accommodating the shuttle valve core, or the shuttle valve housing has a shuttle valve cavity for accommodating the shuttle valve core.

[0046] The mounting cavity has a first working part at one axial end of the shuttle valve core and a second working part at the other axial end of the shuttle valve core. The first working part and the second working part are respectively used to introduce gas to push the shuttle valve core to move axially.

[0047] The first functional part is connected to one axial end of the shuttle valve cavity, and the second functional part is connected to the vent hole on the mounting shell of the shuttle valve.

[0048] Both the first and second actuating parts are used to introduce gas and apply axial force to the shuttle valve core from two directions, so that it is held in the current position or moved to another position. The two actuating parts cooperate with the holding assembly to realize the rapid switching of the shuttle valve core and improve the stability of the shuttle valve core in two preset positions.

[0049] In summary, compared with the prior art, the present invention has at least the following beneficial effects:

[0050] The shuttle valve for the reciprocating diaphragm pump of the present invention, wherein the shuttle valve core and the retaining component cooperate to not only improve the stability of the shuttle valve core in the preset position, but also ensure that even if the shuttle valve core is slightly deviated from the preset position due to external vibration or unstable air source, the support and elastic components will provide the shuttle valve core with a force to return to the preset position, preventing the shuttle valve core from being mistakenly switched due to external vibration or unstable air source and a small amount of gas leakage, so as to ensure the stable conduction of the corresponding air path and air chamber; it can also provide additional axial pushing force when the shuttle valve core is switching positions, thereby increasing the axial movement speed of the shuttle valve core and realizing rapid switching.

[0051] The reciprocating diaphragm pump using the above-mentioned shuttle valve can improve the conductivity stability between the corresponding air path and the air chamber. It will not cause accidental connection or disconnection between the air path and the air chamber due to the shuttle valve core mis-switching caused by external vibration or unstable air source, or a small amount of gas leakage. It can also quickly and accurately realize the inflation switching between the first air chamber and the second air chamber, meeting the requirements of high-efficiency response. Attached Figure Description

[0052] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0053] Figure 1 This is a schematic diagram of the connection structure between the shuttle valve core and the retaining assembly in Embodiment 1 of the present invention;

[0054] Figure 2 This is a schematic diagram of the connection structure between the shuttle valve core and the retaining assembly at another angle in Embodiment 1 of the present invention;

[0055] Figure 3 This is a cross-sectional schematic diagram of the connection structure between the shuttle valve core and the retaining assembly in Embodiment 1 of the present invention, wherein the support member is in a first inclined position;

[0056] Figure 4 This is a cross-sectional schematic diagram of the connection structure between the shuttle valve core and the retaining assembly in Embodiment 1 of the present invention, wherein the support member is in the second inclined position;

[0057] Figure 5 This is an exploded view of the connecting rod and support member according to Embodiment 1 of the present invention;

[0058] Figure 6 This is an exploded view of the connecting rod and support member according to Embodiment 2 of the present invention;

[0059] Figure 7 This is an exploded view of the connecting rod and support member according to Embodiment 3 of the present invention;

[0060] Figure 8 This is a schematic diagram of the shuttle valve in Embodiment 4 of the present invention;

[0061] Figure 9 This is a schematic diagram of the shuttle valve housing according to Embodiment 4 of the present invention;

[0062] Figure 10 This is a schematic diagram of the reciprocating diaphragm pump according to Embodiment 5 of the present invention;

[0063] Figure 11This is a cross-sectional schematic diagram of the reciprocating diaphragm pump according to Embodiment 5 of the present invention, showing that the support member is in a second inclined position and the second air distribution path and the second air intake path are connected.

[0064] Explanation of reference numerals in the attached figures

[0065] 1. Shuttle valve; 2. Reciprocating diaphragm pump;

[0066] 10. Shuttle valve core; 11. Connecting cavity; 12. Blocking part;

[0067] 20. Holding component; 21. Connecting rod; 211. First slot; 212. Groove; 213. Limiting block; 214. First limiting wall; 215. Second limiting wall; 22. Elastic element; 221. Second slot; 222. Opening; 23. Support element; 231. Insertion groove; 232. First inclined position; 233. Second inclined position; 234. Critical position; 235. First angle range; 236. Second angle range;

[0068] 30. Shuttle valve housing; 31. Shuttle valve cavity; 32. First set of connecting holes; 33. Second set of connecting holes; 34. Third set of connecting holes; 35. Fourth set of connecting holes;

[0069] 40. Mounting housing; 41. Vent hole; 42. Vent gap;

[0070] 50. Cover; 51. Fourth limiting wall;

[0071] 60. Main module; 61. Diaphragm; 62. First liquid chamber; 63. Second liquid chamber; 64. Coordinating components;

[0072] 70. First pump casing; 71. First air chamber; 711. First air passage; 712. First air distribution passage; 713. First air intake passage; 72. Mounting cavity; 721. Third limiting wall; 722. First actuating part; 723. Second actuating part; 73. First auxiliary air passage; 74. Second auxiliary air passage;

[0073] 80. Second pump casing; 81. Second air chamber; 811. Second air passage; 812. Second air distribution passage; 813. Second air intake passage. Detailed Implementation

[0074] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0075] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0076] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0077] like Figures 1 to 5 In the first embodiment shown, the shuttle valve 1 (hereinafter referred to as shuttle valve 1) for the reciprocating diaphragm pump is applied to the reciprocating diaphragm pump 2 to realize the switching of the first air chamber 71 and the second air chamber 81 of the reciprocating diaphragm pump 2. Specifically, the reciprocating diaphragm pump 2 can be the prior art, including the first air chamber 71 and the second air chamber 81 arranged opposite to each other, the first air passage 711 for air intake of the first air chamber 71, and the second air passage 811 for air intake of the second air chamber 81. The shuttle valve 1 can realize the connection between the first air chamber 71 and the first air passage 711, and the connection between the second air chamber 81 and the second air passage 811, respectively.

[0078] The shuttle valve 1 includes a shuttle valve core 10 capable of axial movement. Different axial positions of the shuttle valve core 10 can respectively open the first air passage 711 and the first air chamber 71, and close the second air passage 811 and the second air chamber 81, or open the second air passage 811 and the second air chamber 81, and close the first air passage 711 and the first air chamber 71. Based on existing technology, the axial movement and stopping of the shuttle valve core 10 can rely on the gas action of the air source; that is, the shuttle valve core 10 is disposed in a cavity, which can be the shuttle valve cavity of the shuttle valve housing, or it can reciprocate. The mounting cavity on the diaphragm pump is configured such that the gas from the gas source can act on both axial ends of the shuttle valve core 10 to apply an axial force to the shuttle valve core 10. When the gas force at one axial end of the shuttle valve core 10 is less than the gas force at the other end, the shuttle valve core 10 will move towards the end with the smaller gas force and remain in the preset position under the gas force at the other end. However, if the gas pressure of the gas source is unstable, it will cause the axial force on the shuttle valve core 10 to be unstable, causing the shuttle valve core 10 to deviate from the preset position.

[0079] like Figure 1 and Figure 2 As shown, the shuttle valve 1 in this embodiment also includes a retaining assembly 20 that cooperates with the shuttle valve core 10. The retaining assembly 20 includes a connecting rod 21, an elastic element 22, and a support element 23. The connecting rod 21 is axially limited to the shuttle valve core 10, meaning that the connecting rod 21 and the shuttle valve core 10 can transmit force in the axial direction, without requiring a mechanical connection between them. The shuttle valve core 10 also has a first end and a second end. The retaining assembly 20 is located at the first end of the shuttle valve core 10. The connecting rod 21 is axially limited to the first end of the shuttle valve core 10, which can be a contact fit, or a snap-fit ​​or adhesive connection. The elastic element 22 is fixedly arranged in the axial direction of the connecting rod 21, meaning that the elastic element 22 remains stationary in the axial direction, while the connecting rod 21 and the shuttle valve core 10 will move relative to the elastic element 22 in the axial direction. The support element 23 has a first end movably arranged on the connecting rod 21 and a second end movably arranged on the elastic element 22. Specifically, the movable arrangement means that the support element 23 swings relative to the connecting rod 21 and the elastic element 22.

[0080] It should be noted that the axial, circumferential, and radial directions in various embodiments of the present invention are based on the axial, circumferential, and radial directions of the shuttle valve core 10, and the axial, circumferential, and radial directions of the connecting rod 21 are the same as the axial, circumferential, and radial directions of the shuttle valve core 10, respectively.

[0081] In this embodiment, as Figure 3 and Figure 4 As shown, the support member 23 has a first inclined position 232, a second inclined position 233, and a critical position 234 between the two relative to the connecting rod 21. The critical position 234 is perpendicular to the axis of the connecting rod 21. A first angle interval 235 is formed between the first inclined position 232 and the critical position 234, which is defined as A. A second angle interval 236 is formed between the critical position 234 and the second inclined position 233, which is defined as B. It can be seen that the support member 23 is in an inclined state in the first inclined position 232 and the second inclined position 233.

[0082] At the first angle interval 235, the elastic element 22 provides a force to the support element 23 to move in the direction of the first inclined position 232, which is called the preload force. The preload force of the elastic element 22 is transmitted to the connecting rod 21 through the support element 23. The force of the support element 23 on the connecting rod 21 has an axial component force in the direction of the shuttle valve core 10, and the direction of this component force is as follows: Figure 3As shown in F1, it points to the second end. Combined with the axial force exerted by the air pressure at the first end of the shuttle valve core 10, the two axial forces act in the same direction, forming a resultant force. This causes the elastic element 22 and the support element 23 to move the shuttle valve core 10 rapidly towards the second end via the connecting rod 21. Compared to the prior art that relies solely on gas force to push the shuttle valve core 10, the shuttle valve core 10 of this invention moves faster during switching. When the shuttle valve core 10 moves to the preset position corresponding to the second end, and the support element 23 is located at the first inclined position 232, i.e., the boundary of the first angle interval 235, the first air passage 7... 11 can be connected to the first air chamber 71, and the second air passage 811 is isolated from the second air chamber 81. At this time, the gas at the first end of the shuttle valve core 10, as well as the support member 23 and the elastic member 22, together exert an axial force on the first end of the shuttle valve core 10 towards the second end through the connecting rod 21, so that the shuttle valve core 10 is maintained in the preset position corresponding to the second end. Compared with the prior art, which simply relies on the gas force to hold the shuttle valve core 10, the shuttle valve core 10 of the present invention can be maintained more stably in the first inclined position, maintaining the stable connection between the first air passage 711 and the first air chamber 71.

[0083] When switching air chambers is required, the air pressure at the first and second ends of the shuttle valve core 10 changes. Specifically, the air pressure acting on the second end is greater than the air pressure acting on the first end, and also greater than the force exerted by the support member 23 and the elastic member 22 on the first end of the shuttle valve core 10 via the connecting rod 21. The shuttle valve core 10 moves towards the first end, simultaneously causing the connecting rod 21 to move and the tilt position of the support member 23 to change. The support member 23 moves from the first tilt position 232 towards the critical position 234, until it crosses the critical position 234, and then enters the second angle range 236. It should be noted that because there is a pressure difference between the first and second ends, the retaining assembly will not be stuck at the critical position 234 where the support member 23 is perpendicular to the connecting rod 21. After the support member 23 moves from the second end to the first end and enters the second angle range 236, the elastic member 22 provides the connecting rod with the pressure difference between the first and second ends. Figure 4 The axial separation shown in the F2 direction pushes the shuttle valve core 10 to the first end quickly, and the support 23 swings to the second tilt position 233 to avoid the shuttle valve core 10 staying in the middle during the position switching, which would cause the intake switching to fail.

[0084] At the second angle interval 236, the elastic element 22 provides a preload force to the support element 23 to move in the direction of the second inclined position 233. The preload force of the elastic element 22 is transmitted to the connecting rod 21 through the support element 23, forming a force on the connecting rod 21 as follows: Figure 4The axial force in the direction of F2 pushes the connecting rod 21 to move away from the second end, thereby causing the shuttle valve core 10 to remain on the first end, continuously connecting the second air passage 811 and the second air chamber 81, and disconnecting the first air passage 711 and the first air chamber 71. Compared with the prior art that simply relies on the gas force to push the shuttle valve core 10, the shuttle valve core 10 of the present invention moves faster during switching, and the support member 23 is maintained in the second inclined position 233 under the action of the elastic member 22, and together with the gas, applies an axial force to the shuttle valve core 10 towards the first end to maintain the shuttle valve core 10 in the preset position corresponding to the first end. Compared with the prior art that simply relies on the gas force to hold the shuttle valve core 10, the shuttle valve core 10 of the present invention can be maintained more stably in the preset position, maintaining the stable connection between the second air passage 811 and the second air chamber 81.

[0085] It should be noted that there are two situations in which the support rod 23 in this embodiment is located in the first angle range 235 or the second angle range 236. One is that when the shuttle valve core 10 changes direction, the elastic element 22 has the function of promoting the support to quickly reach the target tilt position when the support 23 crosses the critical position 234, thereby enabling the shuttle valve core 10 to quickly reach the target tilt position. The other is that due to external factors such as the vibration of the reciprocating diaphragm pump, the shuttle valve core 10 is not in the preset position at the first end or the second end, and the holding component 20 has the function of promoting the shuttle valve core 10 to return to the target tilt position.

[0086] In summary, the shuttle valve core 10 of the present invention, in cooperation with the retaining component 20, not only improves the stability of the shuttle valve core 10 in the preset position, but also ensures that even if the shuttle valve core 10 is slightly deviated from the preset position due to external vibration or unstable gas source, the support member 23 and the elastic member 22 provide the shuttle valve core 10 with a force to return to the preset position, preventing the shuttle valve core 10 from being mistakenly switched due to external vibration or unstable gas source and a small amount of gas leakage, thus ensuring the stable conduction of the corresponding gas path and gas chamber; it also provides additional axial pushing force when the shuttle valve core 10 is switching positions, increasing the axial movement speed of the shuttle valve core 10, thereby achieving rapid switching.

[0087] like Figure 2 and Figure 5As shown, the connecting rod 21 in this embodiment has a first slot 211. The first end of the support member 23 is movably engaged in the first slot 211. The support member 23 needs to switch between a first tilt position 232, a critical position 234, and a second tilt position 233. The first tilt position 232 and the critical position 234 of the support member 23 form a first angle interval 235, and the critical position 234 and the second tilt position 233 form a second angle interval 236. The first angle interval 235 and the second angle interval 236 occupy different spaces. The maximum thickness of the first slot 211 is at the opening 222 of the first slot 211, and the maximum thickness of the first slot 211 is greater than the maximum thickness of the first end of the support member 23. The maximum thickness of the first slot 211 needs to satisfy the sum of the first angle interval 235 and the second angle interval 236 to provide the first end of the support member 23 with room to move in the first slot 211 when switching tilt angles, ensuring that the support member 23 can flexibly switch between the first tilt position 232, the critical position 234, and the second tilt position 233.

[0088] like Figure 5 As shown, the first slot 211 includes a first limiting wall 214 and a second limiting wall 215 that are axially opposite to each other on the connecting rod 21. The first limiting wall 214 and the second limiting wall 215 are inclined in opposite directions. The functions of the first limiting wall 214 and the second limiting wall 215 are as follows: On the one hand, they are inclined in different directions, so that the first slot 211 forms a funnel shape with a larger outer side and a smaller inner side, which increases the maximum thickness of the first slot 211 and provides the space required for the support member 23 to change its inclination direction; on the other hand, the first limiting wall 214 can serve as the abutment position of the support member 23 at the first inclined position 232, and the second limiting wall 215 can serve as the abutment position of the support member 23 at the second inclined position 233. That is, the support member 23 is supported and limited at different angle positions, so that the force of the support member 23 is accurately transmitted to the connecting rod 21 and the shuttle valve core 10 to maintain the position of the shuttle valve core 10 or drive the shuttle valve core 10 to move axially. It should be noted that the thickness of the first slot 211 refers to the axial dimension of the first slot 211 on the connecting rod 21. In this embodiment, it is... Figure 5 The maximum gap between the first limiting wall 214 and the second limiting wall 215.

[0089] When the support member 23 switches between the first inclined position 232, the critical position 234, and the second inclined position 233, the support member 23 itself will undergo radial displacement, which may cause the first end of the support member 23 to shift relative to the first slot 211 on the connecting rod 21, and thus disengage from the first slot 211. Therefore, as Figure 5As shown, the first slot 211 includes a slot body 212 and a limiting block 213 located in the circumferential center of the slot body 212. The first end of the support member 23 is provided with an insert 231, which is engaged with the limiting block 213 to restrict the circumferential movement of the first end of the support member 23 relative to the connecting rod 21. This restricts the circumferential position of the first end of the support member 23 in the first slot 211, preventing the first end of the support member 23 from sliding out from the side of the first slot 211 and disengaging from the connecting rod 21. This would prevent the force of the support member 23 and the elastic member 22 from being transmitted to the shuttle valve core 10, thus preventing the component 20 from achieving its intended effect. This design ensures the stability of the support member 23 and limits the radial displacement of the support member 23 within a reasonable range, thereby achieving precise force transmission.

[0090] In this embodiment, the limiting block 213 extends from the first limiting wall 214 to the second limiting wall 215, dividing the groove 212 into two sub-grooves, left and right. Correspondingly, the groove 231 on the support member 23 is a deep groove, so that the first end of the support member 23 forms a U-shape. With this setting, the limiting block 213 has a better circumferential limiting effect on the first end of the support member 23, and the engagement between the first end of the support member 23 and the first slot 211 is more stable.

[0091] In other embodiments, such as Figure 6 In the second embodiment shown, the limiting block 213 is a semi-cylinder and does not protrude from the first slot 211, making the first slot 211 a connecting slot. Correspondingly, the groove 231 on the support member 23 is a semi-circular groove. The first slot 211 has abutting walls on both sides of its circumference, which can abut against the first end of the support member 23 to restrict the circumferential movement of the first end of the support member 23 within the first slot 211.

[0092] like Figure 3 and Figure 4 As shown, when the support member 23 switches between the first inclined position 232, the critical position 234, and the second inclined position 233, the support member 23 will radially offset relative to the connecting rod, and the relative position of the first end of the support member 23 and the connecting rod 22 will also change. Therefore, as Figure 5 As shown, the two first slots 211 are connected in the circumferential direction of the connecting rod 21, providing space for the first end of the support member 23 to move radially in the connecting rod 21 when it moves radially. At the same time, the depth of the groove 231 is greater than the radial length of the limiting block 213, so that the first end of the support member 23 can move radially in the direction of the other first slot 211 in the connecting rod 21, thereby avoiding the support member 23 from getting stuck when switching tilt direction, which is conducive to the support member 23 smoothly changing tilt direction and crossing the critical position.

[0093] It is important to note that, such as Figure 5As shown, when the connecting rod 21 has two first slots 211 corresponding to the two support members 23 respectively, the depth of the first slots 211 will not cause the first ends of the two support members 23 to abut against each other and affect the first ends of the support members 23 to penetrate radially into the inner side of the first slots 211.

[0094] In other embodiments, such as Figure 7 In the third embodiment shown, although the two first slots 211 are not connected to each other, the depth of the first slots 211 is much greater than the wall length on both sides of the groove 231, so that when the first end of the support member 23 goes into the inner side of the first slot 211, it will not hit the inner wall of the first slot 211, thus ensuring the space for the first end to move radially on the connecting rod 21.

[0095] like Figure 1 and Figure 2 As shown, in this embodiment, the elastic element 22 is generally annular, with an expandable opening 222 on one side, i.e., an opening 222 ring. This configuration allows the elastic element 22 to undergo circumferential deformation, thereby applying a compressive force (i.e., preload) to the inner support element 23. Specifically, when the support element 23 switches between the first inclined position 232, the critical position 234, and the second inclined position 233, both the first and second ends of the support element 23 will undergo radial displacement in the connecting rod 21. The second end of the support element 23 and the elastic element 22... When the second end moves radially, it also pushes the elastic member 22 to move radially away from the connecting rod 21, thereby causing the elastic member 22 to expand and the opening 222 to become larger. Based on the tendency of the elastic member 22 to maintain its own shape, the elastic member 22 will apply radial compressive force to the support member 23, and based on the direction of the support member 23, it will be decomposed into axial force. When the support member 23 crosses the critical position 234, it will quickly reach the first tilt position 232 or the second tilt position 233, realizing rapid switching.

[0096] When the elastic member 22 undergoes circumferential deformation, the second end of the support member 23 is equivalent to undergoing circumferential displacement with the second slot 221. Therefore, the circumferential width of the second slot 221 is greater than the circumferential width of the second end of the support member 23, so as to provide the second end of the support member 23 with room for movement and prevent the support member 23 from getting stuck when switching tilt angles.

[0097] Of course, in other embodiments, the elastic element 22 may be a radially arranged helical spring that applies a radial preload to the second end of the support element 23, and then the inclined support element 23 generates an axial component force.

[0098] When the shuttle valve 1 in this embodiment is installed in the reciprocating diaphragm pump 2, such as Figure 11As shown, the reciprocating diaphragm pump 2 is provided with a mounting cavity 72 to accommodate the shuttle valve core 10. The shuttle valve core 10 is axially movable in the mounting cavity 72. The shuttle valve core 10 includes at least one communicating cavity 11 and at least two blocking parts 12. The communicating cavity 11 is located between two adjacent blocking parts 12. The shuttle valve core 10 connects or disconnects the air chamber and the air passage by dividing the air passage into two parts: a distribution air passage and an intake air passage. The distribution air passage is always connected to the air source, and the intake air passage is always connected to the air chamber. That is, the first air passage 711 includes a first distribution air passage 712 and a first intake air passage 713, and the second air passage 811 includes a second distribution air passage 812 and a second intake air passage 813. The first distribution air passage 712, the first intake air passage 713, the second distribution air passage 812, and the second intake air passage 813 are respectively provided with openings on the inner wall of the mounting cavity 72. The shuttle valve core 10 is sealed to the inner wall of the mounting cavity 72, which can separate each opening to ensure that the first distribution air passage 712 and the first intake air passage 713 or the second distribution air passage 812 and the second intake air passage 813 are connected only through the connecting cavity 11 on the shuttle valve core 10. The blocking part 12 can block the openings of the air passages that do not need to be connected, ensuring the accuracy of the connection. Specifically, when the support member 23 is in the first inclined position 232, the openings corresponding to the first air distribution path 712 and the first air intake path 713 are exposed in the same connecting cavity 11 of the shuttle valve core 10 and connected. The blocking part 12 blocks the openings corresponding to the second air distribution path 812 and the second air intake path 813, so that the air source is connected to the first air chamber 71 through the first air path 711 to inflate the first air chamber 71, and the second air path 811 and the second air chamber 81 are in a state of isolation. When the support member 23 is in the second inclined position 233, the openings corresponding to the second air distribution path 812 and the second air intake path 813 are exposed in the same connecting cavity 11 of the shuttle valve core 10 and connected. The blocking part 12 blocks the openings corresponding to the first air distribution path 712 and the first air intake path 713, so that the air source is connected to the second air chamber 81 through the second air path 811 to inflate the second air chamber 81, and the first air path 711 and the first air chamber 71 are in a state of isolation.

[0099] like Figure 8 and Figure 9The fourth embodiment shown differs from the first embodiment in that the shuttle valve 1 further includes a shuttle valve housing 30. The shuttle valve housing 30 has a shuttle valve cavity, i.e., a cavity where the shuttle valve core 10 moves axially. The shuttle valve core 10 is installed inside the shuttle valve housing 30. The shuttle valve housing 30 has, circumferentially, a first set of connecting holes 32 corresponding to the first air distribution path 712, a second set of connecting holes 33 corresponding to the first air intake path 713, a third set of connecting holes 34 corresponding to the second air distribution path 812, and a fourth set of connecting holes 35 corresponding to the second air intake path 813, arranged sequentially along the axial direction. When the connecting cavity 11 of the shuttle valve core 10 connects with the first set of connecting holes 32 corresponding to the first air distribution path 712 and the second set of connecting holes 33 corresponding to the first air intake path 713, the first air distribution path 712 and the first air intake path 713 are connected, allowing the air source to be connected to the first air chamber 71 through the first air passage 711, thus connecting the first air chamber. When the second air chamber 81 is inflated, the shielding part 12 of the shuttle valve core 10 blocks at least one of the third group of connecting holes 34 and the fourth group of connecting holes 35, thus isolating the second air distribution path 812 and the second air intake path 813, and isolating the second air passage 811 from the second air chamber 81. Similarly, when the connecting cavity 11 of the shuttle valve core 10 is connected to the third group of connecting holes 34 corresponding to the second air distribution path 812 and the third group of connecting holes 34 corresponding to the second air intake path 813, the second air distribution path 812 and the second air intake path 813 can be connected, so that the air source can be connected to the second air chamber 81 through the second air passage 811 to inflate the second air chamber 81. At the same time, the shielding part 12 of the shuttle valve core 10 blocks at least one of the first group of connecting holes 32 and the second group of connecting holes 33, thus isolating the first air distribution path 712 and the first air intake path 713, and isolating the first air passage 711 from the first air chamber 71.

[0100] Based on the above structure, the tilt state of the support member 23 corresponds to the position of the shuttle valve core 10, so that the support member 23 can assist the shuttle valve core 10 in positioning at a preset position, maintaining the continuity of the corresponding air passage and air chamber. Corresponding connecting holes are provided on the shuttle valve housing 30, allowing the shuttle valve core 10 to move axially within the shuttle valve housing 30. On the one hand, the shuttle valve housing 30 and the shuttle valve core 10 can be made of different materials than the pump housing, making them more wear-resistant. Furthermore, after long-term use, if a fault or wear occurs, the shuttle valve housing 30 can be directly replaced, resulting in lower costs and easier maintenance. On the other hand, the shuttle valve 1 can also increase the sealing area with the shuttle valve core 10, improving the sealing effect, ensuring the independence of each set of connecting holes, and preventing gas leakage to other air passages.

[0101] like Figure 8As shown, the shuttle valve 1 in this embodiment also includes a mounting housing 40 for fixed connection with the reciprocating diaphragm pump 2. The mounting housing 40 is part of the retaining assembly 20, and its function is to fix the retaining assembly 20 on the reciprocating diaphragm pump 2. When the mounting housing 40 is installed on the reciprocating diaphragm pump 2, the mounting housing 40 and the shuttle valve housing 30 are sealed and abutted to axially position the shuttle valve housing 30. At the same time, the mounting housing 40 has an internal channel, and the connecting rod 21 is at least partially located in the mounting housing 40. The shuttle valve housing 30 has a shuttle valve cavity 31 inside, and the two are in a connected state, so that the connecting rod 21 can move axially between the mounting housing 40 and the shuttle valve housing 30 to transmit the axial force of the elastic member 22 and the support member 23 to the shuttle valve core 10, ensuring that the retaining assembly 20 plays the role of maintaining the position and quickly switching the shuttle valve core 10.

[0102] The outer wall of the mounting housing 40 in this embodiment has threads, which can be threadedly fixed to the reciprocating diaphragm pump 2.

[0103] like Figure 10 and Figure 11 The fifth embodiment disclosed here is a reciprocating diaphragm pump 2, including a main module 60, a first pump housing 70 and a second pump housing 80 located on both sides of the main module 60, a diaphragm 61 respectively sealed and sandwiched between the main module 60 and the first pump housing 70 and the second pump housing 80, and a cooperating component 64 disposed on the main module 60; one diaphragm 61 forms a first air chamber 71 between itself and the first pump housing 70, and a first liquid chamber 62 between itself and the main module 60, and the other diaphragm 61 forms a second air chamber 81 between itself and the second pump housing 80, and a second liquid chamber 63 between itself and the main module 60; the main module 60 is provided with an inlet flow path and an outlet flow path, and the first liquid chamber 62 and the second liquid chamber 63 are unidirectionally connected to the inlet flow path and the outlet flow path, respectively. The cooperating component 64 is used to make the two diaphragms 61 move in coordination. The structure of the cooperating component 64 can refer to the prior art, and will not be described in detail here.

[0104] The first pump housing 70 serves as a cover 50, forming a first air chamber 71 with the diaphragm 61. The second pump housing 80 also serves as a cover 50, forming a second air chamber 81 with the diaphragm 61. The main body module 60 forms a first liquid chamber 62 and a second liquid chamber 63 with the diaphragms 61 and 62, respectively. The diaphragms 61 and 62 move synchronously through a coordinating assembly 64. Specifically, the first air chamber 71 is inflated, the diaphragm 61 deforms towards the first liquid chamber 62, and the liquid in the first liquid chamber 62 is discharged from the liquid outlet path. Simultaneously, the coordinating assembly... The component 64 drives the diaphragm 61 to deform towards the second air chamber 81, the second liquid chamber 63 draws liquid from the inlet flow path, and the gas in the second air chamber 81 is discharged. Then, the shuttle valve 1 switches, the second air chamber 81 is inflated, the diaphragm 61 deforms towards the second liquid chamber 63, and the liquid in the second liquid chamber 63 is discharged from the outlet flow path. At the same time, the cooperating component 64 drives the diaphragm 61 to deform towards the first air chamber 71, and the first liquid chamber 62 draws liquid from the inlet flow path. This cycle continues, and the diaphragm pump 2 continuously feeds and discharges liquid with minimal liquid fluctuation.

[0105] The reciprocating diaphragm pump 2 in this embodiment also includes an air intake path connected to an air source. The air intake path includes a first air path 711 corresponding to the first air chamber 71 and a second air path 811 corresponding to the second air chamber 81. It also includes the shuttle valve 1 mentioned above. The shuttle valve 1 is disposed in the air intake path. When the support member 23 is in the first inclined position 232, the first air path 711 can be connected to the first air chamber 71, and the second air path 811 is isolated from the second air chamber 81. When the support member 23 is in the second inclined position 233, the second air path 811 can be connected to the second air chamber 81, and the first air path 711 is isolated from the first air chamber 71.

[0106] Specifically, the preload of the elastic element 22 in the retaining assembly 20 ensures that the shuttle valve core 10 remains in a preset position. When the shuttle valve core 10 changes position, the tilt angle of the support member 23 changes via the connecting rod 21, thus altering the direction of the force exerted on the connecting rod 21. During this process, the elastic element 22 consistently provides a preload in the corresponding direction based on the angle range of the support member 23; that is, the direction of the preload of the elastic element 22 differs depending on the tilt direction of the support member 23. Furthermore, the direction of the preload of the elastic element 22 on the support member 23 differs from the direction of the preload exerted by the shuttle valve core 10 on the support member via the connecting rod 21. The different directions of force applied by 23 prevent the support member 23 from remaining at the critical position 234, thus allowing the support member 23 to cross the critical position 234 and quickly change its tilt angle to the first tilt position 232 or the second tilt position 233. This changes the direction of the force applied to the connecting rod 21. Furthermore, the forces applied to the connecting rod 21 by the elastic member 22 and the support member 23 always have an axial component. This axial component is transmitted to the shuttle valve core 10 through the connecting rod 21, thereby driving the shuttle valve core 10 to quickly reach the next preset position. This prevents the shuttle valve core 10 from stopping midway during position switching, which would lead to intake switching failure.

[0107] Therefore, the reciprocating diaphragm pump 2 of the present invention can improve the conductivity stability between the corresponding air path and the air chamber, and will not cause the shuttle valve core 10 to switch incorrectly due to external vibration or unstable air source, resulting in accidental connection or disconnection between the air path and the air chamber. It can also quickly and accurately realize the inflation switching of the first air chamber 71 and the second air chamber 81, meeting the requirements of high efficiency response.

[0108] A shuttle valve 1 is mounted on a first pump housing 70, which has a mounting cavity 72. The shuttle valve core 10 and the shuttle valve housing 30 are both located within the mounting cavity 72. A portion of the mounting housing 40 is located within the mounting cavity 72 and is threadedly fixed to it, while another portion protrudes from the mounting cavity 72 and abuts against the outer wall of the first pump housing 70 to control the depth of the mounting housing 40 within the mounting cavity 72. Simultaneously, the retaining assembly 20 also includes a cover 50, which covers the portion of the mounting housing 40 that protrudes from the mounting cavity 72. The cover 50 is threadedly fixed to the mounting housing 40, and can block the internal channel of the mounting housing 40, isolating the internal channel from the outside. At the same time, the cover 50 can also provide installation space for the elastic element 22. In this embodiment, the elastic element 22 is embedded in the inner wall of the cover 50, so that the elastic element 22 remains stationary in the axial direction relative to the first pump housing 70, and applies a stable preload to the support 23 and the connecting rod 21. The cover 50 also provides installation space for the support 23 to protect the support 23 and prevent it from being exposed.

[0109] The first pump housing 70 is provided with an auxiliary air passage connected to the air source, which is divided into a first auxiliary air passage 73 corresponding to the first end of the shuttle valve core 10 and a second auxiliary air passage 74 corresponding to the second end of the shuttle valve core 10. The mounting cavity 72 has a venting cavity, i.e., a second actuating part 723, corresponding to the mounting housing 40. At the same time, the mounting housing 40 is provided with a vent hole 41. The venting cavity is used to connect the second auxiliary air passage 74 and the vent hole 41. The vent hole 41 is used to allow gas to enter the mounting housing 40. A venting gap 42 is provided between the outer wall of the connecting rod 21 and the inner wall of the mounting housing 40. The outer diameter of the connecting rod 21 is smaller than the outer diameter of the end face of the shuttle valve core 10 to expose part of the end face of the shuttle valve core 10. The venting gap 42 connects the vent hole 41 and the axial direction of the shuttle valve core 10. On one side, namely the first end face, gas can act on the axial end face of the shuttle valve core 10. Thus, the gas from the gas source can reach the first end of the shuttle valve core 10 through the second auxiliary gas passage 74, the venting chamber, the venting hole 41, and the venting gap 42, and then act on the end face of the shuttle valve core 10 that is not covered by the connecting rod 21 to apply an axial force to the shuttle valve core 10 towards the second end. At the same time, the mounting cavity 72 has a first acting part 722 corresponding to the second end of the shuttle valve core 10. The first acting part 722 is connected to the first auxiliary gas passage 73. Thus, the gas from the gas source can act on the second end of the shuttle valve core 10 through the first auxiliary gas passage 73 and the first acting part 722 to apply an axial force to the shuttle valve core 10 towards the first end. When one air chamber is working, the air pressure in one of the working parts is basically zero, and the axial force of the other working part and the holding assembly 20 on the shuttle valve core 10 is in the same direction, so the shuttle valve core 10 is stably held in the preset position. When the air chamber is switched, the air pressure of the first working part 722 and the second working part 723 is inconsistent, which makes the axial force of the shuttle valve core 10 unbalanced. Combined with the axial force of the holding assembly 20, the shuttle valve core 10 can move axially faster.

[0110] In this embodiment, the shuttle valve 1 includes a shuttle valve housing 30, which has a shuttle valve cavity 31 for accommodating the shuttle valve core 10. The first actuating part 722 and the second actuating part 723 are both connected to the shuttle valve cavity 31. In other embodiments, the mounting cavity 72 forms the shuttle valve cavity 31 for accommodating the shuttle valve core 10, and the first actuating part 722 and the second actuating part 723 formed on the mounting cavity 72 are naturally connected to the shuttle valve cavity 31.

[0111] In this embodiment, the shuttle valve housing 30 is a hollow cylinder, axially positioned in the mounting cavity 72, which has a third limiting wall 721. Simultaneously, the inner wall of the cover 50 has a fourth limiting wall 51. The shuttle valve core 10 and the connecting rod 21 are located between the third limiting wall 721 and the fourth limiting wall 51. When the shuttle valve core 10 moves axially in the mounting cavity 72, it contacts the third limiting wall 721, reaching a preset position at one end, thus connecting the first air passage 711 and the first air chamber 71. At this time, the support... When component 23 is in the first inclined position 232, and the connecting rod 21 touches the fourth limiting wall 51, the shuttle valve core 10 reaches the preset position at the other end, opening the second air passage 811 and the second air chamber 81. At this time, the support component 23 is in the second inclined position 233. In both states, the support component 23 is in an inclined state, continuously applying force to the shuttle valve core 10, and transmitting it to the third limiting wall 721 or the fourth limiting wall 51 respectively, so as to maintain the stability of the shuttle valve core 10 in the two preset positions.

[0112] In other embodiments, one end of the shuttle valve housing 30 has an annular boss, and the side of the annular boss facing the shuttle valve core 10 has a third limiting wall 721, which has the same function as the third limiting wall 721 on the mounting cavity 72, and will not be described again here.

[0113] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A shuttle valve for a reciprocating diaphragm pump, used in a reciprocating diaphragm pump (2), the reciprocating diaphragm pump (2) comprising a first air chamber (71) and a second air chamber (81) disposed opposite to each other, a first air passage (711) for introducing air into the first air chamber (71), and a second air passage (811) for introducing air into the second air chamber (81), characterized in that, The shuttle valve (1) includes a shuttle valve core (10) capable of axial movement and a retaining assembly (20) that cooperates with the shuttle valve core (10). The retaining assembly (20) includes a connecting rod (21), an elastic element (22), and a support element (23). The connecting rod (21) is axially limited to the shuttle valve core (10). The elastic element (22) is fixedly disposed axially on the connecting rod (21). The support element (23) has a first end movably disposed on the connecting rod (21) and a second end movably disposed on the elastic element (22). The support member (23) has a first inclined position (232) and a second inclined position (233) relative to the connecting rod (21); when the support member (23) is in the first inclined position (232), the first air passage (711) can communicate with the first air chamber (71), and the second air passage (811) is isolated from the second air chamber (81); when the support member (23) is in the second inclined position (233), the second air passage (811) can communicate with the second air chamber (81), and the first air passage (711) is isolated from the first air chamber (71). A first angle interval (235) and a second angle interval (236) are formed between the first tilt position (232) and the second tilt position (233). When the support member (23) is located in the first angle interval (235), the elastic member (22) provides the support member (23) with a force to move in the direction of the first tilt position (232). When the support member (23) is located in the second angle interval (236), the elastic member (22) provides the support member (23) with a force to move in the direction of the second tilt position (233).

2. The shuttle valve for a reciprocating diaphragm pump as described in claim 1, characterized in that, The connecting rod (21) is provided with a first slot (211), and the first end of the support member (23) is movably engaged in the first slot (211), and the maximum thickness of the first slot (211) is greater than the maximum thickness of the first end of the support member (23).

3. The shuttle valve for a reciprocating diaphragm pump as described in claim 2, characterized in that, The first slot (211) includes a first limiting wall (214) and a second limiting wall (215) that are axially opposite to each other on the connecting rod (21), and the first limiting wall (214) and the second limiting wall (215) have opposite inclination directions.

4. The shuttle valve for a reciprocating diaphragm pump as described in claim 2, characterized in that, The first slot (211) includes a first groove (212) and a limiting block (213) located in the circumferential center of the first groove (212). The first end of the support member (23) is provided with a groove (231), which is engaged with the limiting block (213) to restrict the first end of the support member (23) from moving circumferentially relative to the connecting rod (21).

5. The shuttle valve for a reciprocating diaphragm pump as described in claim 4, characterized in that, The two first slots (211) are connected in the circumferential direction of the connecting rod (21), and the depth of the slot (231) is greater than the radial length of the limiting block (213).

6. The shuttle valve for a reciprocating diaphragm pump as described in claim 1, characterized in that, The inner wall of the elastic member (22) is provided with a second slot (221) for movably engaging with the second end of the support member (23), and the axial thickness of the second slot (221) is greater than the thickness of the second end of the support member (23).

7. The shuttle valve for a reciprocating diaphragm pump as described in claim 6, characterized in that, The elastic member (22) has an expandable opening (222) on one side, and the circumferential width of the second slot (221) is greater than the circumferential width of the second end of the support member (23).

8. The shuttle valve for a reciprocating diaphragm pump as described in claim 1, characterized in that, It also includes a shuttle valve housing (30), in which the shuttle valve core (10) is installed. The first air passage (711) includes a first air distribution passage (712) and a first air intake passage (713), and the second air passage (811) includes a second air distribution passage (812) and a second air intake passage (813). The shuttle valve housing (30) is provided with a first set of connecting holes (32) corresponding to the first air distribution passage (712), a second set of connecting holes (33) corresponding to the first air intake passage (713), a third set of connecting holes (34) corresponding to the second air distribution passage (812), and a fourth set of connecting holes (35) corresponding to the second air intake passage (813) arranged sequentially along the axial direction. The shuttle valve core (10) includes at least one communicating cavity (11) and at least two blocking portions (12), wherein the communicating cavity (11) is located between two adjacent blocking portions (12). When the support (23) is in the first inclined position (232), the first group of connecting holes (32) and the second group of connecting holes (33) are exposed and connected in the same connecting cavity (11), and the shielding part (12) shields at least one of the third group of connecting holes (34) and the fourth group of connecting holes (35); When the support (23) is in the second inclined position (233), the third set of connecting holes (34) and the fourth set of connecting holes (35) are exposed and connected in the same connecting cavity (11), and the shielding part (12) shields at least one of the first set of connecting holes (32) and the second set of connecting holes (33).

9. The shuttle valve for a reciprocating diaphragm pump as described in claim 8, characterized in that, It also includes a mounting housing (40) for fixed connection with the reciprocating diaphragm pump (2), the mounting housing (40) being in sealed contact with the shuttle valve housing (30), and the connecting rod (21) being at least partially located in the mounting housing (40).

10. The shuttle valve for a reciprocating diaphragm pump as described in claim 9, characterized in that, The mounting housing (40) is provided with a vent hole (41), and a vent gap (42) is provided between the outer wall of the connecting rod (21) and the inner wall of the mounting housing (40). The outer diameter of the connecting rod (21) is smaller than the outer diameter of the end face of the shuttle valve core (10) so as to expose part of the end face of the shuttle valve core (10). The vent gap (42) connects the vent hole (41) and one axial end of the shuttle valve core (10) so that gas can act on the axial end face of the shuttle valve core (10).

11. A reciprocating diaphragm pump, characterized in that, The system includes a main module (60), a first pump housing (70) and a second pump housing (80) located on both sides of the main module (60), diaphragms (61) respectively sealed and sandwiched between the main module (60) and the first pump housing (70) and the second pump housing (80), and a cooperating component (64) disposed on the main module (60); one diaphragm (61) forms a first air chamber (71) between itself and the first pump housing (70) and a first liquid chamber (62) between itself and the main module (60), and the other diaphragm (61) forms a second air chamber (81) between itself and the second pump housing (80) and a second liquid chamber (63) between itself and the main module (60); the main module (60) is provided with an inlet flow path and an outlet flow path, the first liquid chamber (62) and the second liquid chamber (63) are unidirectionally connected to the inlet flow path and the outlet flow path respectively, and the cooperating component (64) is used to enable the two diaphragms (61) to move in coordination; It also includes an intake airflow path connected to the air source, the intake airflow path including a first airflow path (711) corresponding to the first air chamber (71) and a second airflow path (811) corresponding to the second air chamber (81). It also includes a shuttle valve (1) as described in any one of claims 1 to 10, wherein the shuttle valve (1) is disposed in the air intake path, wherein when the support member (23) is in the first inclined position (232), the first air passage (711) is connected to the first air chamber (71), and the second air passage (811) is isolated from the second air chamber (81); when the support member (23) is in the second inclined position (233), the second air passage (811) is connected to the second air chamber (81), and the first air passage (711) is isolated from the first air chamber (71).

12. The reciprocating diaphragm pump as described in claim 11, characterized in that, The shuttle valve (1) is disposed on the first pump housing (70), and the first pump housing (70) is provided with a mounting cavity (72); It also includes a third limiting wall (721) located on the mounting cavity (72) or the shuttle valve housing (30) of the shuttle valve (1) and a fourth limiting wall (51) located on the cover (50) of the retaining assembly (20). When the support (23) is in the first inclined position (232), the shuttle valve core (10) abuts against the third limiting wall (721). When the support (23) is in the second inclined position (233), the connecting rod (21) abuts against the fourth limiting wall (51).

13. The reciprocating diaphragm pump as described in claim 12, characterized in that, The mounting cavity (72) forms a shuttle valve cavity (31) for accommodating the shuttle valve core (10), or the shuttle valve housing (30) has a shuttle valve cavity (31) for accommodating the shuttle valve core (10). The mounting cavity (72) has a first working part (722) at one axial end of the shuttle valve core (10) and a second working part (723) at the other axial end of the shuttle valve core (10). The first working part (722) and the second working part (723) are respectively used to introduce gas to push the shuttle valve core (10) to move axially. The first actuating part (722) is connected to one axial end of the shuttle valve cavity (31), and the second actuating part (723) is connected to the vent hole on the mounting shell (40) of the shuttle valve (1).

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