A valve and control system for a constant flow type external counterpulsation device

Abstract

The present application relates to the technical field of external counterpulsation valve, in particular to a steady flow type external counterpulsation valve and control system. A plurality of parallelly arranged gas distribution modules, comprising: an air inlet branch, an air extraction branch and an air flow channel; further comprising: a valve core flow channel, which is provided with a first air separation plate and a second air separation plate, the first air separation plate and the second air separation plate are respectively provided with air holes one and two, the side wall of the valve core flow channel is provided with an air flow groove and a first annular flange; a rod body, which is axially arranged in the first air separation plate; an air separation valve core, which is slidingly arranged on the rod body and is floatingly matched with the air hole one; a pressure maintaining valve core, which comprises a piston head, a connecting rod and a gas blocking head, the pressure maintaining valve core is provided with an exhaust flow channel, and the pressure maintaining valve core moves away from the air separation valve core, and the gas blocking head is abutted against the second air separation plate to close the air hole two, and the rod body is separated from the air inlet to open the exhaust flow channel. It can adapt to high pressure air inlet and has good reliability.

Description

Technical Field

[0001] This invention relates to the field of external counterpulsator valve technology, specifically to a steady-flow external counterpulsator valve and control system. Background Technology

[0002] An external counterpulsator (EPP) is a non-invasive circulatory assist device that sequentially applies pressure to the patient's lower limbs and buttocks during diastole, driving blood back to the aorta, increasing coronary perfusion pressure and cerebral blood flow, thereby treating ischemic cardiovascular and cerebrovascular diseases. One of its core components is the gas distribution system, which is responsible for precisely controlling the inflation and deflation timing of the working gasbag wrapped around the limb.

[0003] Current external counterpulsators typically use centralized or modular inflator valves to control the cuff. However, regardless of the form, traditional inflator valves have a significant limitation in their design: to ensure that the cuff reaches and stabilizes at the preset treatment pressure at the end of inflation, the supply pressure of the inflator module is usually set to be the same as or close to the final working pressure of the cuff. While this mode ensures pressure stability, it leads to slow inflation speed and low inflator efficiency, prolonging the counterpulsator's inflation time and affecting its timely tracking of the cardiac cycle.

[0004] If an attempt is made to use a higher pressure air source to improve inflation efficiency, it will be difficult to control the airbag pressure and the reliability will be difficult to guarantee. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides a steady-flow external counterpulsator valve that can adapt to high-pressure air intake to improve air intake efficiency, and has good reliability with overpressure relief protection and over-flush function.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0007] A steady-flow external counterpulsator valve, comprising:

[0008] Several air distribution modules are arranged in parallel. Each air distribution module corresponds to a working airbag. The air distribution module includes an intake branch, an exhaust branch, and a ventilation channel. The ventilation channel is connected to the intake branch and the exhaust branch respectively. The ventilation channel is used to connect to the working airbag.

[0009] Also includes:

[0010] The valve core flow channel has a first air baffle and a second air baffle that are spaced apart. The first air baffle and the second air baffle are respectively provided with air hole one and air hole two. The outer ends of the valve core flow channel corresponding to the first air baffle and the second air baffle are respectively connected to the air inlet branch and the air extraction branch. The second air baffle is axially movable. The side wall of the valve core flow channel is provided with a vent groove and a first annular flange. The vent groove is located on the radial outer side of the second air baffle. The first annular flange is located at the end of the vent groove away from the first air baffle. The first annular flange is used to limit the stroke of the second air baffle moving away from the first air baffle. When the second air baffle moves to abut against the first annular flange, the flow channel corresponding to the vent groove will be closed. A piston chamber is provided at the outer end of the valve core flow channel near the second air baffle.

[0011] The rod is axially inserted through the first air-blocking plate;

[0012] The air-isolating valve core is slidably sleeved on the rod body, and the air-isolating valve core is in floating fit with the air hole;

[0013] The pressure-holding valve core includes a piston head, a connecting rod, and an air-blocking head. The air-blocking head and the piston head are respectively connected to both ends of the connecting rod. The air-blocking head is located between the second air-blocking plate and the air-blocking valve core. The piston head is slidably disposed in the piston chamber. The pressure-holding valve core is provided with an exhaust flow channel. The exhaust flow channel includes an air inlet located at the end of the air-blocking head away from the piston head. The end of the rod body is sealed to the air inlet.

[0014] As the pressure-holding valve core moves away from the air-blocking valve core, the following sequence occurs: the air-blocking head abuts against the second air-blocking plate to close the second air hole, and the rod body disengages from the air inlet to open the exhaust flow channel.

[0015] Furthermore, in one embodiment of the steady-flow external counterpulsator valve of this application, a first compression spring is provided within the piston chamber. The first compression spring abuts against the end of the piston head away from the air-blocking head to apply pressure toward the air-blocking valve core to the pressure-holding valve core. As a preferred embodiment of this application, the first compression spring is used to apply resistance to the pressure-holding valve core, preventing it from rising, thereby balancing the pressure on both sides of the piston head.

[0016] Furthermore, in this application, a flow-stabilizing external counterpulsator valve includes a vent valve core comprising a sealing plate, a sleeve, and a limiting seat. The sleeve passes through a first vent plate and is slidably fitted onto a rod. The sealing plate and the limiting seat are spaced apart on the sleeve. The sealing plate is located on the side of the first vent plate closer to the second vent plate, and the limiting seat is located on the side of the first vent plate farther from the first vent plate. A second compression spring abuts against the limiting seat and the first vent plate. In its natural state, the vent plug presses against the sealing plate, closing the first vent. During air intake, as the pressure-holding valve core moves, the vent plug separates from the sealing plate. As a preferred embodiment of this application, during air intake, the vent valve core moves to open the first vent, and the limiting seat abuts against the first vent plate to limit the travel of the moving vent valve core. During initial air intake, the pressure difference between the two sides of the first baffle plate is too large. If the spring force applied to the baffle valve core is too small, the limiting seat will impact the first baffle plate during the process of the baffle valve core being lifted. However, if the spring force applied to the baffle valve core is too large, the baffle valve core will not open sensitively enough during the process of the pressure difference between the two sides of the first baffle plate decreasing, thus affecting the air intake efficiency.

[0017] To solve the above problems, based on the above device, in the reset state, the air-blocking valve core is subjected to the combined action of the first compression spring and the second compression spring. At this time, when initial air intake is performed, the elastic force of the first compression spring and the second compression spring must be overcome simultaneously to open the first air hole and reduce the impact between the limiting seat and the first air-blocking plate. During the air intake process, as the pressure-holding valve core continues to rise, the air-blocking head separates from the sealing plate. At this time, the air-blocking valve core is only subjected to the elastic force of the second compression spring, and the sensitivity of the air-blocking valve core in opening the first air hole is improved, thereby improving the air intake efficiency.

[0018] Furthermore, in a steady-flow type external counterpulsator valve of this application, the piston head sidewall is provided with an annular air groove, the exhaust channel includes an air outlet located on the annular air groove, the piston chamber inner wall is provided with an air guide port, and when the pressure holding valve core moves to the point where the rod body is disengaged from the air inlet, the air guide port is connected to the annular air groove.

[0019] A pair of first sealing rings are provided on the inner wall of the piston chamber on both sides of the axial direction of the air inlet, and a second sealing ring is provided on the side wall of the piston head on the side of the annular air groove near the air blockage head. The first and second sealing rings are used to seal the radial gap between the piston head and the piston chamber.

[0020] Based on the above structure, the first and second sealing rings on the side near the valve core flow channel seal the outlet position of the exhaust flow channel, preventing gas leakage in the valve core flow channel before the pressure-holding valve core rises to the point where the rod separates from the air inlet. Furthermore, a flow-stabilizing external counterpulsator valve in this application also includes a third compression spring, which abuts against the end of the second air-blocking plate away from the first air-blocking plate.

[0021] The inner wall of the valve core flow channel is provided with a second annular flange. The second annular flange is located on the side of the second air baffle plate near the first air baffle plate to limit the stroke of the second air baffle plate moving towards the first air baffle plate. The vent groove extends axially into the second annular flange and penetrates the inner wall of the second annular flange. As a preferred embodiment of this application, the third compression spring is used to ensure the stability of the axial movement of the second air baffle plate and to ensure that the second air baffle plate abuts against the second annular flange when resetting. When the valve core flow channel abuts against the second annular flange, the air passage corresponding to the first annular flange is in the open state.

[0022] Furthermore, the valve of the steady-flow external counterpulsator in this application also includes an intake main channel and an exhaust main channel. An intake solenoid valve is provided on the intake branch channel, which is used to switch the on / off state between the intake branch channel and the intake main channel. An exhaust solenoid valve is provided on the exhaust branch channel, which is used to switch the on / off state between the exhaust branch channel and the exhaust main channel.

[0023] Furthermore, the valve of the steady-flow external counterpulsator in this application also includes a valve body, with each gas distribution module arranged along the x-axis direction on the valve body. The valve body includes a first valve body and a second valve body that are fitted and connected along the y-axis direction. The valve core flow channel and the piston chamber are disposed between the mating surfaces of the first valve body and the second valve body and extend along the z-axis. The main air intake channel and the main air extraction channel are respectively disposed on the first valve body and the second valve body and extend in the same direction as the arrangement direction of the gas distribution modules. The air intake branch channel and the air extraction branch channel are respectively disposed on the first valve body and the second valve body.

[0024] Furthermore, in a steady-flow external counterpulsator valve of this application, a limiting flange is provided within the valve core flow channel. A first air baffle plate near a second air baffle plate moves and abuts against the limiting flange. A sealing seat is connected to the valve body. The sealing seat is installed at the axial end of the valve core flow channel away from the piston chamber to seal the axial outer end of the valve core flow channel near the first air baffle plate. An annular positioning platform is provided on the sealing seat, abutting against the end of the first air baffle plate away from the limiting flange. An air inlet channel passes through the annular positioning platform, and a rod is installed on the sealing seat. As a preferred embodiment of this application, based on the above structure, it has the advantage of easy assembly and disassembly.

[0025] Furthermore, in a steady-flow external counterpulsator valve of this application, an adjusting seat is connected to the valve body. The adjusting seat is installed at the end of the piston chamber away from the valve core flow channel. A threaded hole is axially passed through the adjusting seat, and an adjusting screw is connected in the threaded hole. The adjusting screw abuts against the end of the first compression spring away from the pressure-holding valve core. As a preferred embodiment of this application, the adjusting screw can be moved axially to adjust the preload of the first compression spring, thereby adjusting the air pressure in the valve core flow channel when the pressure-holding valve core is raised to a preset height.

[0026] A control system based on a rising valve includes:

[0027] The intake module is connected to the main intake duct;

[0028] The air extraction module is connected to the main air extraction channel;

[0029] Each working airbag corresponds to a gas distribution module, and each working airbag is connected to the airflow channel.

[0030] The solenoid valve control module is electrically connected to each intake solenoid valve and exhaust solenoid valve.

[0031] The solenoid valve control module controls the opening or closing of each air intake solenoid valve and air extraction solenoid valve according to the timing sequence. When air is intake, the air extraction solenoid valve is closed, and each air intake solenoid valve opens in sequence to realize the sequential inflation of each working airbag. After inflation is completed and a preset time is waited, air extraction is performed. When air extraction is performed, the air extraction solenoid valve is opened, and the air intake solenoid valve is closed before the air extraction solenoid valve is opened. After air extraction is completed, the air extraction solenoid valve is closed, waiting for the next working cycle.

[0032] As can be seen from the above technical solution, the present invention has the following beneficial effects:

[0033] Based on the above device, the working principle of a steady-flow external counterpulsator valve is as follows:

[0034] During intake, the gas enters the valve core flow channel from the intake branch and then passes through the air passage. During the process of entering the valve core flow channel:

[0035] The airflow first pushes open the air-blocking valve core and the air-blocking head. The gas passes through the first air-blocking plate through the first air hole, and the gas passes through the second air hole and the ventilation groove through the second air-blocking plate.

[0036] As the air pressure continues to rise, the pressure-holding valve core rises until the air-blocking head abuts against the second air-blocking plate, and the second air hole closes. At this time, air can only be vented through the air vent. If the air pressure is too high during this process, it will push the second air-blocking plate against the first annular flange. At this time, the air passage corresponding to the air vent is closed, and air can only be vented through the second air hole. Therefore, it can ensure that the airflow velocity is reduced, and prevent the air pressure in the valve core flow channel from rising too quickly in a local area, which would cause the pressure-holding valve core to be quickly pushed up and prematurely vent, affecting the inflation efficiency.

[0037] When the air pressure reaches the preset working value, the pressure holding valve core and the second air baffle rise until they do not abut against the first annular flange, the rod body seals with the air inlet, and the exhaust flow channel is in a closed state.

[0038] When the air pressure rises too high, before the pressure-holding valve core rises to move the second air baffle to abut against the first annular flange, the air inlet separates from the end of the rod, and the gas is discharged through the exhaust channel, realizing automatic pressure relief. This prevents the second air baffle from being bent after abutting against the first annular flange due to excessive air pressure. Even if the air pressure is too high and the exhaust channel cannot relieve pressure in time, the second air baffle, when it moves to abut against the first annular flange, can completely close the ventilation slot and the second air hole, preventing airflow from entering the ventilation channel through the second air baffle, thus avoiding over-inflation of the working airbag.

[0039] After the air intake is completed, the air intake solenoid valve closes. At this time, the air isolation valve core descends to close the vent hole of the first air isolation plate, so as to isolate the air passage between the valve core flow channel and the air intake branch, thereby achieving the pressure holding function. Even if the air intake branch leaks, the airbag can remain inflated to ensure system stability.

[0040] When evacuating, the evacuation solenoid valve opens, and the gas is discharged through the evacuation branch. During this process, the pressure holding valve core resets to abut against the air isolation valve core.

[0041] Therefore, compared to traditional valves that can only use an air intake module with the same air intake pressure as the working air pressure of the airbag, the valve based on this application can perform high-pressure air intake to improve air intake efficiency, and can ensure the stability of the air pressure in the working airbag. It also has overpressure relief protection and over-rush function, and has the advantage of high reliability. Attached Figure Description

[0042] Figure 1 This is a plan view of a steady-flow external counterpulsator valve according to an embodiment of this application;

[0043] Figure 2 for Figure 1 A sectional view along the center line AA;

[0044] Figure 3 for Figure 2 A magnified view of a portion of area B in the center circle;

[0045] Figure 4 for Figure 2 Schematic diagram showing the positional relationship between the air gap valve core, the pressure holding valve core, and the second air gap plate;

[0046] Figure 5 for Figure 2 A schematic diagram showing the separation of the first valve body and the second valve body;

[0047] Figure 6 This is a diagram showing the state when the air intake vent is open.

[0048] Figure 7 This is a diagram showing the state of the pressure-holding valve core when it abuts against the second baffle plate during air intake;

[0049] Figure 8 This is a diagram showing the state of the exhaust passage opening during air intake;

[0050] Figure 9 Figure 8 A magnified view of a portion of area C in the middle circle;

[0051] Figure 10 for Figure 2 A schematic diagram showing the separation of the middle sealing seat.

[0052] In the diagram: 1-Valve body; 101-Main intake duct; 102-Main exhaust duct; 103-Branch intake duct; 104-Branch exhaust duct; 105-Air passage; 11-First valve body; 12-Second valve body; 13-Sealing seat; 131-Annular positioning platform; 14-Adjusting seat; 140-Threaded hole; 141-Adjusting screw;

[0053] 21-Intake solenoid valve; 22-Exhaust solenoid valve;

[0054] 3-Valve core flow channel; 301-First air baffle plate; 3010-Air hole one; 302-Second air baffle plate; 3020-Air hole two; 31-Ventilation groove; 32-Piston chamber; 320-Air guide port; 321-First sealing ring; 33-First annular flange; 34-Second annular flange; 35-Limiting flange;

[0055] 4-Bar body;

[0056] 5-Air-proof valve core; 51-Sealing plate; 52-Sleeve; 53-Limit seat;

[0057] 6-Pressure holding valve core; 60-Exhaust passage; 601-Inlet; 602-Outlet; 61-Piston head; 610-Annular groove; 611-Second sealing ring; 62-Connecting rod; 63-Air plug; 631-Third sealing ring;

[0058] 71 - First compression spring; 72 - Second compression spring; 73 - Third compression spring. Detailed Implementation

[0059] Example 1

[0060] Combination Figures 1 to 5 The valve of a steady-flow external counterpulsator shown includes:

[0061] Several air distribution modules are arranged in parallel. Each air distribution module corresponds to a working airbag. The air distribution module includes an air intake branch 103, an air extraction branch 104, and a ventilation channel 105. The ventilation channel 105 is connected to the air intake branch 103 and the air extraction branch 104 respectively. The ventilation channel 105 is used to connect to the working airbag.

[0062] Its characteristic is that it further includes:

[0063] The axially extending valve core flow channel 3 contains a first air baffle 301 and a second air baffle 302 spaced apart. The first air baffle 301 and the second air baffle 302 are respectively provided with air holes 3010 and 3020. The outer ends of the valve core flow channel 3 corresponding to the first air baffle 301 and the second air baffle 302 are connected to the air inlet branch 103 and the air extraction branch 104, respectively. The second air baffle 302 is axially movable. A vent groove 31 is provided on the side wall of the valve core flow channel 3 (see...). Figure 5 The valve core flow channel 3 has a first annular flange 33 and a vent groove 31 located radially outside the second air baffle 302. The first annular flange 33 is located at the end of the vent groove 31 away from the first air baffle 301. The first annular flange 33 is used to limit the stroke of the second air baffle 302 moving away from the first air baffle 301. When the second air baffle 302 moves to abut against the first annular flange 33, the flow channel corresponding to the vent groove 31 will be closed. A piston chamber 32 is provided at the outer end of the valve core flow channel 3 near the second air baffle 302.

[0064] Rod 4, which is axially inserted through the first air-blocking plate 301;

[0065] The air-isolating valve core 5 is slidably sleeved on the rod body 4, and the air-isolating valve core 5 is in floating cooperation with the air hole 3010.

[0066] The pressure holding valve core 6 includes a piston head 61, a connecting rod 62, and an air plug 63. The air plug 63 and the piston head 61 are respectively connected to the two ends of the connecting rod 62. The air plug 63 is located between the second air-blocking plate 302 and the air-blocking valve core 5. The piston head 61 is slidably disposed in the piston chamber 32. The pressure holding valve core 6 is provided with an exhaust flow channel 60. The exhaust flow channel 60 includes an air inlet 601 located at the end of the air plug 63 away from the piston head 61. The end of the rod body 4 is sealed to the air inlet 601.

[0067] During the process of the pressure holding valve core 6 moving away from the air isolation valve core 5, the following will occur in sequence: the air blocking head 63 abuts against the second air isolation plate 302 to close the second air hole 3020, and the rod body 4 disengages from the air inlet 601 to open the exhaust flow channel 60.

[0068] Among them, the side wall of the air-blocking head 63 near the air-isolating valve core 5 is tapered, wider at the top and narrower at the bottom, so as to play a guiding role.

[0069] Based on the above device, its working principle is as follows:

[0070] During intake, the gas enters the valve core flow channel 3 from the intake branch 103 and then passes through the air passage 105. During the process of entering the valve core flow channel 3:

[0071] like Figure 6As shown, the airflow first pushes open the air-blocking valve core 5 and the air-blocking head 63, and the gas passes through the first air-blocking plate 301 through the first air-blocking plate 301 through the first air-blocking plate 301, and the gas passes through the second air-blocking plate 302 through the second air-blocking plate 302 through the second air-blocking plate 302 and the ventilation groove 31.

[0072] As the air pressure continues to rise, such as Figure 7 As shown, the pressure-holding valve core 6 rises until the air-blocking head 63 abuts against the second air-blocking plate 302, and the second air hole 3020 is closed. At this time, air can only be vented through the air passage 31. If the air pressure is too high during this process, it will push the second air-blocking plate 302 against the first annular flange 33. At this time, the air passage corresponding to the air passage 31 is closed, and air can only be vented through the second air hole 3020. Therefore, it can ensure that the airflow velocity is reduced, and prevent the local air pressure in the valve core flow channel 3 from rising too quickly, causing the pressure-holding valve core 6 to be quickly pushed up and prematurely venting air, which will affect the inflation efficiency.

[0073] When the air pressure reaches the preset working value, the pressure holding valve core 6 and the second air isolation plate 302 rise until they do not abut against the first annular flange 33, the rod body 4 seals with the air inlet 601, and the exhaust passage 60 is in a closed state.

[0074] When the air pressure rises too high, such as Figure 8 and Figure 9 As shown, before the pressure-holding valve core 6 rises to move the second air baffle 302 to abut against the first annular flange 33, the air inlet 601 separates from the end of the rod body 4, and the gas is discharged through the exhaust channel 60, realizing automatic pressure relief and preventing the second air baffle 302 from being bent after abutting against the first annular flange 33 due to excessive air pressure. Even if the air pressure is too high and the exhaust channel cannot relieve pressure in time, the second air baffle can completely close the ventilation slot and the second air hole because it moves to abut against the first annular flange, so that the airflow cannot enter the ventilation channel through the second air baffle, thus avoiding the over-inflation of the working airbag.

[0075] After the air intake is completed, the air intake solenoid valve 21 is closed. At this time, the air isolation valve core 5 descends to close the vent hole of the first air isolation plate 301, so as to isolate the air passage between the valve core flow channel 3 and the air intake branch 103 and achieve the pressure holding function. At this time, even if the air intake branch 103 leaks, the air bag can remain inflated to ensure the stability of the system.

[0076] When evacuating, the evacuation solenoid valve 22 opens, and the gas is discharged through the evacuation branch 104. During this process, the pressure holding valve core 6 resets to abut against the air isolation valve core 5.

[0077] Compared to traditional valves that can only use an air intake module with the same air intake pressure as the working air pressure of the airbag, the valve based on this application can perform high-pressure air intake to improve air intake efficiency and ensure the stability of the air pressure in the working airbag.

[0078] Furthermore, in this embodiment, a first compression spring 71 is provided inside the piston chamber 32. The first compression spring 71 abuts against the end of the piston head 61 away from the air-blocking head 63 to apply pressure toward the air-blocking valve core 5 to the pressure-holding valve core 6. The first compression spring 71 is used to apply resistance to the pressure-holding valve core 6 to prevent it from rising, so that the pressure on both sides of the piston head 61 is balanced.

[0079] Furthermore, in this embodiment, the air-blocking valve core 5 includes a sealing plate 51, a sleeve 52, and a limiting seat 53. The sleeve 52 passes through the first air-blocking plate 301 and is slidably sleeved on the rod body 4. The sealing plate 51 and the limiting seat 53 are spaced apart on the sleeve 52. The sealing plate 51 is located on the side of the first air-blocking plate 301 near the second air-blocking plate 302, and the limiting seat 53 is located on the side of the first air-blocking plate 301 away from the first air-blocking plate 301. Specifically, the sealing plate 51 and the sleeve 52 are an integral piece, and the limiting seat 53 is connected to the lower end of the sleeve 52.

[0080] Because the pressure difference between the two sides of the first baffle plate 301 is too large during initial air intake, if the spring force applied to the baffle valve core 5 is too small, the limiting seat 53 will impact the first baffle plate 301 during the lifting process of the baffle valve core 5. However, if the spring force applied to the baffle valve core 5 is too large, the baffle valve core 5 will not open sensitively enough during the reduction of the pressure difference between the two sides of the first baffle plate 301, affecting the air intake efficiency. To solve the above problems, a second compression spring 72 is further abutted between the limiting seat 53 and the first baffle plate 301. In its natural state, if... Figure 2 As shown, the air-blocking head 63 presses against the sealing plate 51, and the sealing plate 51 closes the air hole 3010. During the air intake process, as the pressure-holding valve core 6 moves, the air-blocking head 63 will separate from the sealing plate 51. During the air intake process, the air-blocking valve core 5 moves to open the air hole 3010. The limiting seat 53 is used to abut against the first air-blocking plate 301 to limit the movement stroke of the moving air-blocking valve core 5. Specifically, the limiting seat 53 is provided with several ventilation notches to ensure that the air passage is open when the limiting seat 53 abuts against the first air-blocking plate 301. Based on the above device, in the reset state, the air-blocking valve core 5 is subjected to the combined action of the first compression spring 71 and the second compression spring 72. At this time, when initial air intake is performed, it is necessary to overcome the elastic force of the first compression spring 71 and the second compression spring 72 to open the air hole 3010 and reduce the impact between the limiting seat 53 and the first air-blocking plate 301. During the air intake process, since the pressure-holding valve core 6 will continue to rise, the air-blocking head 63 will separate from the sealing plate 51. At this time, the air-blocking valve core 5 is only subjected to the elastic force of the second compression spring 72. The sensitivity of the air-blocking valve core 5 in opening the air hole 3010 is improved, thereby improving the air intake efficiency.

[0081] Furthermore, in this embodiment, the piston head 61 has an annular groove 610 on its sidewall, and the exhaust channel 60 includes an outlet 602 located on the annular groove 610. The piston cavity 32 has an air guide port 320 on its inner wall. When the pressure holding valve core 6 moves to the point where the rod 4 is disengaged from the air inlet 601, the air guide port 320 is connected to the annular groove 610. A pair of first sealing rings 321 are respectively provided on the axial sides of the inner wall of the piston cavity 32 corresponding to the air guide port 320. A second sealing ring 611 is provided on the sidewall of the piston head 61 corresponding to the annular groove 610 near the air blocking head 63. The first sealing ring 321 and the second sealing ring 611 are used to seal the radial gap between the piston head 61 and the piston cavity 32. When the second air baffle 302 abuts against the first annular flange 33, the second sealing ring 611 is located at the end of the air guide port 320 near the valve core channel 3. Based on the above structure, the first sealing ring 321 and the second sealing ring 611 on the side near the valve core flow channel 3 seal the outlet position of the exhaust flow channel 60, preventing gas leakage in the valve core flow channel 3 before the pressure-holding valve core 6 rises to the point where the rod 4 separates from the air inlet 601. Specifically, a third sealing ring 631 is provided on the inner wall of the plug head 63 corresponding to the air inlet 601 to seal the radial gap between the air inlet 601 and the rod 4.

[0082] Furthermore, this embodiment also includes a third compression spring 73, which abuts against the end of the second air-blocking plate 302 away from the first air-blocking plate 301; the inner wall of the valve core flow channel 3 is provided with a second annular flange 34, which is located on the side of the second air-blocking plate 302 near the first air-blocking plate 301 to limit the stroke of the second air-blocking plate 302 towards the first air-blocking plate 301; the vent groove 31 extends axially into the second annular flange 34 and penetrates the inner wall of the second annular flange 34. The function of the third compression spring 73 includes, but is not limited to: ensuring the stability of the axial movement of the second air-blocking plate 302 and ensuring that the second air-blocking plate 302 abuts against the second annular flange 34 during reset; when the valve core flow channel 3 abuts against the second annular flange 34, the air passage corresponding to the first annular flange 33 is in an open state.

[0083] Furthermore, in this embodiment, it also includes an intake main duct 101 and an exhaust main duct 102. An intake solenoid valve 21 is provided on the intake branch duct 103, which is used to switch the on / off state between the intake branch duct 103 and the intake main duct 101. An exhaust solenoid valve 22 is provided on the exhaust branch duct 104, which is used to switch the on / off state between the exhaust branch duct 104 and the exhaust main duct 102.

[0084] In this embodiment, the intake solenoid valve 21 and the exhaust solenoid valve 22 are existing solenoid valves. The air passage is opened and closed by controlling the extension and retraction of the moving iron core through the energization of the coil.

[0085] Furthermore, in this embodiment, a valve body 1 is also included. Each gas distribution module is arranged on the valve body 1 along the x-axis. The valve body 1 includes a first valve body 11 and a second valve body 12 connected in contact along the y-axis. A valve core flow channel 3 and a piston chamber 32 are disposed between the contact surfaces of the first valve body 11 and the second valve body 12 and extend along the z-axis. An intake main channel 101 and an exhaust main channel 102 are respectively disposed on the first valve body 11 and the second valve body 12, and their extending directions are consistent with the arrangement direction of the gas distribution modules. An intake branch channel 103 and an exhaust branch channel 104 are respectively disposed on the first valve body 11 and the second valve body 12. Specifically, an air guide port 320 is disposed on the second valve body 12 and communicates with the exhaust main channel 102. Specifically, the x, y, and z axes are perpendicular to each other.

[0086] Furthermore, in combination Figure 10 As shown, in this embodiment, a limiting flange 35 is provided inside the valve core flow channel 3. The first air baffle 301 moves and abuts against the limiting flange 35 near the second air baffle 302. A sealing seat 13 is connected to the valve body 1. The sealing seat 13 is installed at the axial end of the valve core flow channel 3 away from the piston chamber 32 to seal the axial outer end of the valve core flow channel 3 near the first air baffle 301. An annular positioning platform 131 is provided on the sealing seat 13. The annular positioning platform 131 abuts against the end of the first air baffle 301 away from the limiting flange 35. The air inlet branch 103 passes through the annular positioning platform 131. The rod 4 is installed on the sealing seat 13. Specifically, the sealing seat 13 is embedded in the valve body 1 as a whole, and is simultaneously connected to the first valve body 11 and the second valve body 12 by screws. Based on the above structure, it has the advantage of being easy to disassemble and assemble.

[0087] Furthermore, in this embodiment, an adjusting seat 14 is connected to the valve body 1. The adjusting seat 14 is installed at the end of the piston chamber 32 away from the valve core flow channel 3. A threaded hole 140 is axially provided on the adjusting seat 14, and an adjusting screw 141 is connected in the threaded hole 140. The adjusting screw 141 abuts against the end of the first compression spring 71 away from the pressure-holding valve core 6. The adjusting screw 141 can move axially to adjust the preload of the first compression spring 71, thereby adjusting the air pressure in the valve core flow channel 3 when the pressure-holding valve core 6 is raised to a preset height.

[0088] Example 2

[0089] A control system, based on the valve in Embodiment 1, includes:

[0090] The intake module, i.e. the air source, is connected to the main intake duct 101;

[0091] The air extraction module can be an air extraction pump, which is connected to the main air extraction channel 102;

[0092] Each working airbag corresponds to a gas distribution module, and each working airbag is connected to the airflow channel 105.

[0093] The solenoid valve control module is electrically connected to each of the intake solenoid valves 21 and the exhaust solenoid valves 22.

[0094] The solenoid valve control module controls the opening or closing of each air intake solenoid valve 21 and air extraction solenoid valve 22 according to the timing sequence. When air is intake, the air extraction solenoid valve 22 is closed and each air intake solenoid valve 21 is opened in sequence to realize the sequential inflation of each working airbag. After the inflation is completed and a preset time is waited, the air extraction is performed. When air extraction is performed, the air extraction solenoid valve 22 is opened and the air intake solenoid valve 21 is closed before the air extraction solenoid valve 22 is opened. After the air extraction is completed, the air extraction solenoid valve 22 is closed, waiting for the next working cycle.

[0095] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of the invention and should not be construed as limiting the scope of protection of the invention in any way. Based on this explanation, those skilled in the art can conceive of other specific embodiments of the invention without creative effort, and these embodiments will all fall within the scope of protection of the present invention.

Claims

1. A steady-flow type external counterpulsator valve, comprising: A plurality of air distribution modules are arranged in parallel, the air distribution module including: an intake branch (103), an exhaust branch (104) and a ventilation channel (105), the ventilation channel (105) being connected to the intake branch (103) and the exhaust branch (104) respectively; Its characteristic is that it further includes: The valve core flow channel (3) is provided with a first air baffle (301) and a second air baffle (302) arranged at intervals. The first air baffle (301) and the second air baffle (302) are respectively provided with air hole one (3010) and air hole two (3020). The valve core flow channel (3) is connected to the air inlet branch (103) and the air extraction branch (104) respectively at the outer ends of the first air baffle (301) and the second air baffle (302). The second air baffle (302) is axially movable. The valve core flow channel (3) is provided with a ventilation groove (31) and a first annular flange (33) on the side wall. The ventilation groove (31) is located on the radial outer side of the second air baffle (302). The first annular flange (33) is located at the end of the ventilation groove (31) away from the first air baffle (301). A piston chamber (32) is provided at the outer end of the valve core flow channel (3) near the second air baffle (302). The rod (4) is axially inserted through the first air-blocking plate (301). The air-isolating valve core (5) is slidably sleeved on the rod body (4), and the air-isolating valve core (5) is in floating cooperation with the air hole one (3010); The pressure holding valve core (6) includes a piston head (61), a connecting rod (62) and a plug head (63). The plug head (63) and the piston head (61) are respectively connected to the two ends of the connecting rod (62). The plug head (63) is located between the second air-blocking plate (302) and the air-blocking valve core (5). The piston head (61) is slidably disposed in the piston chamber (32). The pressure holding valve core (6) is provided with an exhaust flow channel (60). The exhaust flow channel (60) includes an air inlet (601) located at the end of the plug head (63) away from the piston head (61). The end of the rod body (4) is sealed to the air inlet (601). During the process of the pressure holding valve core (6) moving away from the air isolation valve core (5), the following will occur in sequence: the air blocking head (63) abuts against the second air isolation plate (302) to close the second air hole (3020), and the rod body (4) disengages from the air inlet (601) to open the exhaust flow channel (60). The piston chamber (32) is provided with a first compression spring (71), which abuts against the end of the piston head (61) away from the air-blocking head (63) to apply pressure toward the air-blocking valve core (5) to the pressure-holding valve core (6); The air-blocking valve core (5) includes a sealing plate (51), a sleeve (52) and a limiting seat (53). The sleeve (52) passes through the first air-blocking plate (301) and is slidably sleeved on the rod (4). The sealing plate (51) and the limiting seat (53) are spaced apart on the sleeve (52). The sealing plate (51) is located on the side of the first air-blocking plate (301) near the second air-blocking plate (302), and the limiting seat (53) is located on the side of the first air-blocking plate (301) away from the first air-blocking plate (301). A second compression spring (72) abuts between the limiting seat (53) and the first air-blocking plate (301). In its natural state, the air-blocking head (63) presses against the sealing plate (51), and the sealing plate (51) closes the air hole one (3010). During the air intake process, as the pressure-holding valve core (6) moves, the air-blocking head (63) will separate from the sealing plate (51).

2. The steady-flow type external counterpulsator valve according to claim 1, characterized in that: The piston head (61) has an annular air groove (610) on its side wall. The exhaust channel (60) includes an air outlet (602) located on the annular air groove (610). The piston chamber (32) has an air guide port (320) on its inner wall. When the pressure holding valve core (6) moves to the point where the rod (4) is separated from the air inlet (601), the air guide port (320) is connected to the annular air groove (610). A pair of first sealing rings (321) are provided on the inner wall of the piston cavity (32) on both sides of the axial direction of the air inlet (320). A second sealing ring (611) is provided on the side wall of the piston head (61) on the side of the annular air groove (610) near the air block head (63). The first sealing ring (321) and the second sealing ring (611) are used to seal the radial gap between the piston head (61) and the piston cavity (32).

3. The steady-flow type external counterpulsator valve according to claim 1, characterized in that: It also includes a third compression spring (73), which abuts against the end of the second air barrier (302) away from the first air barrier (301); The inner wall of the valve core flow channel (3) is provided with a second annular flange (34). The second annular flange (34) is located on the side of the second air baffle (302) near the first air baffle (301) to limit the stroke of the second air baffle (302) towards the first air baffle (301). The vent groove (31) extends axially into the second annular flange (34) and penetrates the inner wall of the second annular flange (34).

4. The steady-flow type external counterpulsator valve according to claim 1, characterized in that: It also includes an intake main duct (101) and an exhaust main duct (102). An intake solenoid valve (21) is provided on the intake branch duct (103). The intake solenoid valve (21) is used to switch the connection between the intake branch duct (103) and the intake main duct (101). An exhaust solenoid valve (22) is provided on the exhaust branch duct (104). The exhaust solenoid valve (22) is used to switch the connection between the exhaust branch duct (104) and the exhaust main duct (102).

5. A steady-flow type external counterpulsator valve according to claim 4, characterized in that: It also includes a valve body (1), and each gas distribution module is arranged on the valve body (1) along the x-axis direction. The valve body (1) includes a first valve body (11) and a second valve body (12) that are fitted together along the y-axis direction. The valve core flow channel (3) and the piston chamber (32) are arranged between the mating surfaces of the first valve body (11) and the second valve body (12) and extend along the z-axis. The main intake channel (101) and the main exhaust channel (102) are respectively arranged on the first valve body (11) and the second valve body (12) and extend in the same direction as the arrangement direction of the gas distribution module. The intake branch channel (103) and the exhaust branch channel (104) are respectively arranged on the first valve body (11) and the second valve body (12).

6. A flow-stabilizing external counterpulsator valve according to claim 5, characterized in that: The valve core flow channel (3) is provided with a limiting flange (35). The first air baffle (301) moves and abuts against the limiting flange (35) near the second air baffle (302). The valve body (1) is connected to a sealing seat (13). The sealing seat (13) is installed at the axial end of the valve core flow channel (3) away from the piston chamber (32) to seal the axial outer end of the valve core flow channel (3) near the first air baffle (301). The sealing seat (13) is provided with an annular positioning platform (131). The annular positioning platform (131) abuts against the end of the first air baffle (301) away from the limiting flange (35). The air inlet branch (103) passes through the annular positioning platform (131). The rod (4) is installed on the sealing seat (13).

7. A steady-flow type external counterpulsator valve according to claim 5, characterized in that: An adjusting seat (14) is connected to the valve body (1). The adjusting seat (14) is installed at the end of the piston chamber (32) away from the valve core flow channel (3). A threaded hole (140) is axially provided on the adjusting seat (14). An adjusting screw (141) is connected in the threaded hole (140). The adjusting screw (141) abuts against the end of the first compression spring (71) away from the pressure-holding valve core (6).

8. A control system based on the valve of claim 4, characterized in that: include: An intake module, which is connected to the main intake duct (101); The air extraction module is connected to the main air extraction channel (102); Each working airbag corresponds to a gas distribution module, and each working airbag is connected to the airflow channel (105); The solenoid valve control module is electrically connected to each intake solenoid valve (21) and exhaust solenoid valve (22).

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