Intermittent inflating and pressurizing device with heat preservation function

Abstract

The invention provides an intermittent inflating and pressurizing device with a heat preservation function, belongs to the technical field of medical apparatuses and instruments, and aims to solve the technical problem that lower limb vein thrombosis is easy to occur due to the fact that blood is in the states of high coagulation, slow temperature loss and the like due to long-time operation braking, anesthetic use and the like of gastrointestinal tract operation patients. Comprising a host shell; the pressurizing sleeve is located outside the main machine shell, air bags are arrayed on the pressurizing sleeve, all the air bags are provided with a common outlet end pipe and a common inlet end pipe, and the air bags have different bulging degrees along with changes of pressure in the pipes; and the pumping mechanism is located in the main machine shell, the outlet end pipe and the inlet end pipe are both connected with the pumping mechanism, the pumping mechanism can drive fluid to circularly flow between the outlet end pipe and the inlet end pipe, and the pumping mechanism can adjust the pressure and temperature of the fluid in the circulating pipeline. The method has the technical effects of remarkably accelerating the postoperative blood circulation recovery process of a patient and effectively preventing lower limb vein thrombosis.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an intermittent inflation and pressurization device with a heat preservation function. Background Art

[0002] Gastrointestinal tumor surgery is a common treatment. Prolonged immobilization, the use of anesthetics, and the surgical procedures during and after surgery can have numerous adverse effects on the patient's body, such as decreased blood flow and hypothermia. These conditions can easily lead to a hypercoagulable state in the patient's blood, which can in turn cause postoperative lower extremity venous thrombosis (LVT). This LVT not only exacerbates patient pain but can also lead to serious complications, hampering postoperative recovery. Summary of the Invention

[0003] In response to the shortcomings of the existing technology, the present invention proposes an intermittent inflation and pressurization device with a heat preservation function, which is used to solve the technical problem that patients undergoing gastrointestinal surgery are prone to lower limb venous thrombosis due to long-term immobilization during surgery, the use of anesthetics, etc., which causes the blood to be in a state of hypercoagulability and slow hypothermia.

[0004] The technical solution adopted by the present invention is: an intermittent inflation and pressurization device with heat preservation function, comprising: Host housing; A compression sleeve located outside the main body housing, wherein the compression sleeve has an array of airbags, all of which have common outlet and inlet tubes, and the airbags have different bulging degrees as the pressure in the tubes changes; And a pumping mechanism located in the main body housing, the outlet pipe and the inlet pipe are both connected to the pumping mechanism, the pumping mechanism can drive the fluid to circulate between the outlet pipe and the inlet pipe, and the pumping mechanism can adjust the fluid pressure and temperature in the circulation pipeline.

[0005] Optionally, the pumping mechanism comprises a first piston and a second piston having opposite compression and expansion states; The cavities of the first piston and the second piston are connected through an internal circuit and an external circuit respectively. The on-off states of the internal circuit and the external circuit are opposite. The external circuit is connected to the outlet pipe and the inlet pipe, and the internal circuit is directly connected through the pipeline in the main body shell.

[0006] Optionally, the first piston includes a first cavity and a first piston disc; The second piston includes a second cavity and a second piston disc; The pumping mechanism further includes a middle piston rod, a third piston disc and a fourth piston disc; The first cavity and the second cavity are coaxially spaced apart, and the first piston disc and the second piston disc are respectively arranged at two ends of the middle piston rod and respectively cooperate with the pistons of the first cavity and the second cavity; The third piston disc is coaxially arranged at the other end of the first cavity and cooperates with the piston of the first cavity; The fourth piston disc is coaxially arranged at the other end of the second cavity and cooperates with the piston of the second cavity; It also includes a power mechanism for controlling the axial movement of the middle piston rod, the third piston disc and the fourth piston disc.

[0007] Optionally, a driven wheel is further included, wherein the shaft hole of the driven wheel is threadedly matched with the middle piston rod, the driven wheel is rotationally matched with the main body housing, and the driven wheel is driven to rotate by a power mechanism.

[0008] Optionally, a driving shaft is provided in the main body housing parallel to the middle piston rod, and a driving wheel for transmitting power to the driven wheel is provided at a corresponding position on the driving shaft, and the driving shaft or the driving wheel is driven to rotate by a power source.

[0009] Optionally, both ends of the driving shaft extend to the ends of the first cavity and the second cavity respectively, and both ends of the driving shaft are provided with threads with opposite thread directions, and each is provided with a matching thrust nut, and the thrust nut is slidably matched with the main body housing; The piston end of the third piston disc is in sliding cooperation with the first cavity, and the tail end is in sliding cooperation with the sliding shaft fixed to the main body housing, and the sliding position can be locked by a locking mechanism. The third piston disc is provided with a force ring; The thrust nut is provided with a thrust groove which is wider than the thickness of the force ring. When the thrust nut moves axially, two sides of the thrust groove respectively contact two sides of the force ring and push the third piston disc to move; The fourth piston disc is arranged at the end of the second cavity in the same manner.

[0010] Optionally, the locking mechanism includes a locking rod and an abutment platform; The locking rod is located inside the force ring and along the radial direction of the force ring, with one end being able to contact the sliding shaft and the other end being able to contact the abutment platform; The abutment platform is located in the thrust groove, and the height of the abutment platform on both sides of the thrust groove is lower than that of the middle part.

[0011] Optionally, a heating component is provided in the internal circuit to heat the fluid flowing through it.

[0012] Optionally, a first communicating hole and a second communicating hole are respectively provided on the first piston disk at different axial positions, one end of the first communicating hole and the second communicating hole are connected to the first cavity, and the other end faces the side wall. During the axial movement of the first piston disk, the first communicating hole and the second communicating hole can be alternately connected to the internal circuit and the external circuit.

[0013] Optionally, the airbags are strip-shaped and connected in parallel.

[0014] It can be seen from the above technical solution that the beneficial technical effects of the present invention are as follows: In order to address the problems of patients suffering from blood hypercoagulability, slow hypothermia and lower limb venous thrombosis caused by prolonged immobilization during surgery and the use of anesthetics, a pumping mechanism is used to drive fluid circulation and adjust pressure and temperature, so that the array airbags have different degrees of inflation, achieving intermittent pressurization and thermal insulation heating, significantly accelerating the patient's postoperative blood circulation recovery process and effectively preventing lower limb venous thrombosis. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0016] Figure 1 It is an overall schematic diagram.

[0017] Figure 2 This is a schematic diagram of the interior of the host housing.

[0018] Figure 3 Schematic diagram of the pumping mechanism.

[0019] Figure 4 It is a vertical cross-sectional diagram of the pumping mechanism.

[0020] Figure 5 for Figure 4 A partial enlarged schematic diagram of point A in the middle.

[0021] Figure 6 Schematic diagram of the internal circuit connection status of the pumping mechanism.

[0022] Figure 7 Schematic diagram of the external circuit connection status of the pumping mechanism.

[0023] Figure numerals: main body housing 1, pressurizing sleeve 2, airbag 21, outlet tube 22, inlet tube 23, pumping mechanism 3, first chamber 31, first piston disc 32, force ring 321, locking rod 322, first communicating hole 323, second communicating hole 324, second chamber 33, second piston disc 34, internal circuit 35, external circuit 36, middle piston rod 37, driven wheel 371, third piston disc 38, fourth piston disc 39, driving shaft 4, driving wheel 41, thrust nut 5, thrust groove 51, abutment platform 511, sliding shaft 6. DETAILED DESCRIPTION

[0024] The following embodiments of the technical solution of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0025] It should be noted that, unless otherwise specified, the technical or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0026] Intermittent air compression device with heat preservation function, please see the attached Figure 1 and Figure 2 ,A possible implementation is as follows, including: Host housing 1; The compression sleeve 2 is located outside the main body shell 1. The compression sleeve 2 is arrayed with airbags 21. All airbags 21 have a common outlet tube 22 and inlet tube 23. The airbags 21 have different bulging degrees as the pressure in the tube changes. The two ends of the compression sleeve 2 are provided with connecting structures, such as Velcro. The number and connection method of the airbags 21 can be set as needed. For example, the airbags 21 are strip-shaped and parallel to each other, such as Figure 1 shown.

[0027] When in use, first, take out the compression sleeve 2 and connect it to the host, and place the compression sleeve 2 on the appropriate position of the patient's calf to ensure that the compression sleeve 2 can cover the area that needs compression treatment. Use the Velcro and other connecting structures at both ends of the compression sleeve 2 to tightly and comfortably wrap the compression sleeve 2 on the patient's calf to ensure that the compression sleeve 2 will not slide or fall off. When it is necessary to start compression treatment, the host can use the outlet tube 22 and the inlet tube 23 to fill the airbag 21 with fluid. As the pressure in the tube changes, the airbag 21 will show different degrees of bulging, and the restraining position of the compression sleeve 2 will be intermittently pressed, so that the blood in the lower limbs is squeezed from the lower limbs to the upper limbs, and then flows back from the upper limbs to the lower limbs, increasing the blood flow rate, reducing blood stasis in the deep veins of the legs, eliminating edema, promoting the emptying of blood stasis in the veins of the lower limbs and blood circulation in the limbs, preventing coagulation factors from adhering and aggregating on the endothelial wall of the blood vessels, preventing the formation of thrombi, and increasing the activity of the vascular fiber system.

[0028] And the pumping mechanism 3 is located in the main body housing 1, the outlet pipe 22 and the inlet pipe 23 are both connected to the pumping mechanism 3, the pumping mechanism 3 can drive the fluid to circulate between the outlet pipe 22 and the inlet pipe 23, and the pumping mechanism 3 can adjust the fluid pressure and temperature in the circulation pipeline. When a patient suffers from hypothermia due to some reasons (such as blood loss during surgery), the temperature of the fluid in the circulation line can be appropriately adjusted, and fluid of appropriate temperature can be input to transfer heat to the blood circulation in the area covered by the compression sleeve, thereby promoting the body's temperature to rise and playing a role in hypothermia recovery; secondly, the cooling effect. If the patient has a fever or other conditions and needs cooling treatment, by adjusting the temperature of the fluid in the circulation line and inputting low-temperature fluid, the compression sleeve can play a cooling role and alleviate the fever reaction; thirdly, the intermittent time is adjustable. In the process of changing the pressure and temperature of the fluid in the circulation line, the intermittent time of the compression sleeve can be synchronously adjusted. According to the patient's specific condition and treatment needs, the duration of pressurization and pause can be flexibly set to make the treatment more targeted and personalized; fourthly, the pressure intensity is adjustable. By adjusting the fluid pressure in the circulation line, the degree of inflation of the airbag 21 on the compression sleeve can be accurately controlled, thereby achieving the adjustment of the pressure intensity to meet the different pressure intensity requirements of different patients and different treatment stages, improving the treatment effect and patient comfort.

[0029] In one possible implementation, see the attached Figure 2-Figure 4 The pumping mechanism 3 includes a first piston and a second piston with opposite compression (extrusion) and expansion (suction) states; the cavities of the first piston and the second piston are connected through an internal circuit 35 and an external circuit 36 ​​respectively. The on-off states of the internal circuit 35 and the external circuit 36 ​​are opposite and can be controlled by valves. The external circuit 36 ​​is connected to the outlet pipe 22 and the inlet pipe 23 (equivalent to the pressurizing sleeve 2 in series), and the internal circuit 35 is directly connected through the pipeline in the main body housing 1.

[0030] In the above embodiment, the main working process is: In the initial state, the internal circuit 35 is disconnected and the external circuit 36 ​​is connected. The first piston and the second piston are in motion. Specifically, the first piston squeezes out and the second piston draws in fluid. The fluid flows from the first piston through the external circuit 36 ​​(pressurization sleeve 2) to the second piston. During this process, the fluid pressure at the restraining part of the compression sleeve 2 is pressurized. In the intermittent state, the internal circuit 35 is connected and the external circuit 36 ​​is disconnected, and the first piston and the second piston are in action. Specifically, the first piston sucks and the second piston squeezes out. The fluid passes from the second piston through the internal circuit 35 to the first piston. During this process, the heating or cooling device of the internal circuit 35 can adjust the fluid temperature. The external circuit 36 ​​is cut off and there is no pressurization effect.

[0031] In the above-mentioned embodiment, the main technical effect is that the fluid forms a circulation, i.e., a circular flow; whereas in the prior art, there is only a single circuit, i.e., the fluid circulates back and forth. Under this circulation mode of the present solution, the fluid can fully exchange heat with the blood circulation in the portion wrapped by the pressurized sleeve 2, achieving effective temperature regulation. For example, when hypothermia is recovered, a fluid of appropriate temperature is delivered to promote temperature recovery, and when fever occurs, a low-temperature fluid is delivered for cooling treatment. In the single-pipe solution of the prior art, the fluid reciprocates, with part of the fluid always in the pump of the host and part of the fluid always in the pressurized sleeve 2. The fluid exchange is very small, and it is impossible to effectively carry the temperature-regulating medium between the heating and cooling section of the internal circuit 35 and the body parts of the external circuit 36 ​​for sufficient heat exchange. It is difficult to achieve the ideal temperature regulation and treatment effect because the prior art device can only pressurize but not control temperature. The present solution avoids this problem and ensures sufficient heat exchange between the temperature-regulating medium and the blood circulation of the body parts.

[0032] In addition, this solution uses the cooperation of two pistons as the power source, which is quieter and has lower noise than the existing technology that uses a pump as the power source. When used in the ward, it can effectively reduce the impact on the quiet environment of the ward and create a more comfortable treatment atmosphere for patients.

[0033] In one possible implementation, see the attached Figure 2-Figure 4 The first piston includes a first cavity 31 and a first piston disc 32; the second piston includes a second cavity 33 and a second piston disc 34; the pumping mechanism 3 also includes a middle piston rod 37, a third piston disc 38 and a fourth piston disc 39; The first cavity 31 and the second cavity 33 are coaxially spaced apart. The first piston disc 32 and the second piston disc 34 are respectively provided at both ends of the middle piston rod 37 and cooperate with the pistons of the first cavity 31 and the second cavity 33 respectively. The third piston disc 38 is coaxially disposed at the other end of the first cavity 31 and cooperates with the piston of the first cavity 31; the fourth piston disc 39 is coaxially disposed at the other end of the second cavity 33 and cooperates with the piston of the second cavity 33; It also includes a power mechanism for controlling the axial movement of the middle piston rod 37, the third piston disc 38 and the fourth piston disc 39.

[0034] In the above-described embodiment, the main operating process is as follows: Axial movement of the middle piston rod 37 driven by a power mechanism achieves opposite movements of the first and second pistons. Specifically, when one piston draws fluid, the other squeezes it out, creating a pressure differential across the inner circuit 35 or outer circuit 36, thereby generating a driving force for fluid flow. Axial movement of the third and fourth piston discs 38 and 39 driven by the power mechanism changes the volumes of the first and second piston cavities, respectively. While maintaining the same fluid volume, changing the volumes of the piston cavities changes the hydrostatic pressure within the piston cavities. The different axial movement amounts of the third and fourth piston discs 38 and 39 correspond to different initial hydrostatic pressures within the piston cavities. During the reciprocating motion of the middle piston rod 37, the pressures reflected in the outer circuit 36 ​​(pressurization sleeve 2) also vary. Consequently, adjusting the axial movement amounts of the third and fourth piston discs 38 and 39 adjusts the pressing force of the pressurization sleeve 2.

[0035] The primary technical benefit of the above-described embodiment is that, by adjusting the axial movement of the third and fourth piston discs 38 and 39, the compression force of the compression sleeve 2 can be precisely adjusted, meeting the personalized compression force requirements of different patients and conditions, thereby improving treatment effectiveness and patient comfort. Furthermore, compared to existing technologies, this solution utilizes pistons as both a power source and an adjustment mechanism, resulting in quieter and less noisy operation and a wider adjustment range, enabling continuous adjustment.

[0036] In one possible embodiment, when fluid heating or cooling is not required, the internal circuit 35 can be directly disconnected, leaving the external circuit 36 ​​always connected. The first and second piston discs 32, 34, and the middle piston rod 37 remain stationary, and the pressure force of the compression sleeve 2 is controlled by the different axial movements of the third and fourth piston discs 38, 39.

[0037] In one possible implementation, see the attached Figure 2 , and also includes a driven wheel 371, the shaft hole of the driven wheel 371 is threadedly matched with the middle piston rod 37, the driven wheel 371 is rotationally matched with the main body housing 1, and the driven wheel 371 is driven to rotate by a power mechanism, for example, the driven wheel 371 is directly connected to the motor through a belt, gears, etc.

[0038] In the above embodiment, the main working process is: when the motor drives the driven wheel 371 to rotate, due to the threaded fit between the shaft hole of the driven wheel 371 and the middle piston rod 37, the driven wheel 371 is limited by the main body housing 1 and cannot move. During the rotation of the driven wheel 371, the middle piston rod 37 will move axially, thereby forming opposite compression and expansion effects on the pistons on both sides.

[0039] The primary technical effect of the above-described embodiment is the use of a single power source (the motor driving the driven wheel 371) to achieve synchronous and opposite control of the two pistons. This design not only simplifies the power system, reduces the number of power sources, and reduces cost and complexity, but also ensures the synchronization and coordination of the two pistons' movements, improving the stability and reliability of the entire device in ensuring pipeline operation. It also facilitates more precise control of fluid circulation within the circuit and the compression and clearance movements of the compression sleeve 2, thereby enhancing therapeutic efficacy and the patient experience.

[0040] In one possible implementation, see the attached Figure 2 A driving shaft 4 is provided in the main body housing 1 parallel to the middle piston rod 37, and a driving wheel 41 (such as a gear meshing) is provided at a corresponding position on the driving shaft 4 to transmit power to the driven wheel 371. The driving shaft 4 or the driving wheel 41 is driven to rotate by the power source.

[0041] Further, combined with Figure 4 The two ends of the driving shaft 4 extend to the ends of the first cavity 31 and the second cavity 33, respectively. The two ends of the driving shaft 4 are provided with threads with opposite rotation directions, and each is provided with a matching thrust nut 5. The thrust nut 5 slides with the main body housing 1. During the rotation of the driving shaft 4, the two thrust nuts 5 will move synchronously toward or in opposite directions. The piston end of the third piston disc 38 is in sliding engagement with the first cavity 31 , and the tail end is in sliding engagement with the sliding shaft 6 (which may be a hollow shaft) fixed to the main body housing 1 , and the sliding position can be locked by a locking mechanism. A force ring 321 is provided on the third piston disc 38 ; The thrust nut 5 is provided with a thrust groove 51 which is wider than the thickness of the force ring 321. When the thrust nut 5 moves axially, the two sides of the thrust groove 51 contact the two sides of the force ring 321 and push the third piston disc 38 to move. The fourth piston disc 39 is disposed at the end of the second cavity 33 in the same manner.

[0042] Furthermore, if Figure 4 As shown, the locking mechanism includes a locking rod 322 and an abutment platform 511; The locking rod 322 is located inside the force ring 321 and along the radial direction of the force ring 321. One end of the locking rod 322 can contact the sliding shaft 6, and the other end can contact the abutment platform 511. The sliding shaft 6 can have a rectangular or circular cross section. The abutment platform 511 is located in the thrust groove 51, and the height of the two sides of the thrust groove 51 is lower than the middle part. The abutment platform 511 can change the position of the locking rod 322. When the thrust nut 5 has no thrust on the force ring 321 ( Figure 5(As shown in the state shown), locking rod 322 firmly presses against sliding shaft 6, securing the two together and preventing relative movement. When thrust nut 5 exerts a thrust on force ring 321 (moving to its maximum position, with the side faces in contact), locking rod 322 falls into the low-level space on either side of abutment platform 511, and the upper end of locking rod 322 disengages from sliding shaft 6, allowing relative movement between the two. In short, the function of locking rod 322 is to ensure that force ring 321 (third piston disc 38) can slide relative to sliding shaft 6 when thrust nut 5 pushes force ring 321. When thrust nut 5 does not push force ring 321, force ring 321 (third piston disc 38) can be fixed relative to sliding shaft 6.

[0043] Further, combined with Figure 6 The first piston disk 32 is provided with a first communicating hole 323 and a second communicating hole 324 at different axial positions. One end of the first communicating hole 323 and the second communicating hole 324 is connected to the first cavity 31, and the other end faces the side wall. During the axial movement of the first piston disk 32, the first communicating hole 323 and the second communicating hole 324 can be alternately connected to the internal circuit 35 and the external circuit 36.

[0044] In the above embodiment, the main operating process is as follows: when the driving shaft 4 reciprocates, it drives the central piston rod 37 to reciprocate axially, creating an alternating pressure and suction state on the pistons on both sides, generating a circulating fluid force. Simultaneously, when the driving shaft 4 reciprocates, the thrust nuts 5 on both sides also reciprocate, pushing the third and fourth piston discs 38 and 39 to reciprocate axially. This, on the one hand, switches the connection between the internal circuit 35 and the external circuit 36, and on the other hand, changes the size of the piston cavities on both sides, resulting in pressure changes.

[0045] During the reciprocating rotation of the driving shaft 4, because the thrust groove 51 of the thrust nut 5 is wider than the force ring 321, when the force ring 321 is located in the center of the thrust groove 51 and not in contact with the end surfaces of the thrust groove 51, the thrust nut 5 cannot push the third and fourth piston discs 38 and 39 to move. In other words, during the lateral movement of the middle piston rod 37, the force ring 321 exerts a corresponding thrust on the thrust nut 5, causing displacement, only after reaching a certain stroke (maximum end-side displacement). In short, each time the middle piston rod 37 reaches its maximum position at one end, it pushes the third and fourth piston discs 38 and 39 to switch between connected states.

[0046] Combine Figure 6 and Figure 7 When the third piston disc 38 and the fourth piston disc 39 are pushed, they have at least two working positions. Taking the third piston disc 38 as an example, Figure 6At this time, the third piston disc 38 is pushed to the side close to the outer end by the thrust nut 5, the internal circuit 35 is connected, the fluid is heated or cooled when flowing through, and the external circuit 36 ​​is disconnected. As the middle piston rod 37 continues to move, the two piston chambers form suction and pressure, until the middle piston rod 37 moves to the extreme position at one end, and at the same time, the thrust nut 5 pushes the third piston disc 38 to the working position close to the middle, as shown in FIG. Figure 7 , the external circuit 36 ​​is connected and the internal circuit 35 is disconnected. As the middle piston rod 37 continues to move, the fluid flows through the external circuit 36 ​​and pressurizes and heats the patient's body parts until the middle piston rod 37 moves to the extreme position at this end, and then reverses to repeat the process.

[0047] In one possible implementation, a heating element or cooling element is provided within the internal loop 35 to heat the fluid flowing therethrough. For example, a section within the internal loop 35 may be constructed of metal, with a heating wire or a semiconductor cooling element (both known technologies) installed on the metal section to enable different functions as needed.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. An intermittent pneumatic pressurizing device with heat preservation function, characterized in that: include: Host housing (1); A pressurizing sleeve (2) is located outside the main body shell (1), and an air bag (21) is arranged on the pressurizing sleeve (2). The air bag (21) has a common outlet pipe (22) and an inlet pipe (23), and the air bag (21) has different bulging degrees as the pressure in the pipe changes; and a pumping mechanism (3) located in the main body housing (1); the outlet pipe (22) and the inlet pipe (23) are both connected to the pumping mechanism (3); the pumping mechanism (3) can drive the fluid to circulate between the outlet pipe (22) and the inlet pipe (23); and the pumping mechanism (3) can adjust the pressure and temperature of the fluid in the circulation pipeline.

2. The intermittent pneumatic pressurizing device with heat preservation function according to claim 1, characterized in that: The pumping mechanism (3) comprises a first piston and a second piston in opposite compression and expansion states; The cavities of the first piston and the second piston are communicated with each other through an internal circuit (35) and an external circuit (36), respectively. The on-off states of the internal circuit (35) and the external circuit (36) are opposite. The external circuit (36) is connected to the outlet pipe (22) and the inlet pipe (23), and the internal circuit (35) is directly communicated with the main body housing (1) through a pipeline.

3. The intermittent pneumatic pressurizing device with heat preservation function according to claim 2, characterized in that: The first piston comprises a first cavity (31) and a first piston disc (32); The second piston includes a second cavity (33) and a second piston disc (34); The pumping mechanism (3) further comprises a middle piston rod (37), a third piston disc (38) and a fourth piston disc (39); The first chamber (31) and the second chamber (33) are coaxially spaced apart, and the first piston disc (32) and the second piston disc (34) are respectively arranged at both ends of the middle piston rod (37) and respectively cooperate with the pistons of the first chamber (31) and the second chamber (33); The third piston disc (38) is coaxially arranged at the other end of the first cavity (31) and cooperates with the piston of the first cavity (31); The fourth piston disc (39) is coaxially arranged at the other end of the second cavity (33) and cooperates with the piston of the second cavity (33); It also includes a power mechanism for controlling the axial movement of the middle piston rod (37), the third piston disc (38) and the fourth piston disc (39).

4. The intermittent pneumatic pressurizing device with heat preservation function according to claim 3, characterized in that: It also includes a driven wheel (371), the shaft hole of the driven wheel (371) is threadedly matched with the middle piston rod (37), the driven wheel (371) is rotationally matched with the main body housing (1), and the driven wheel (371) is driven to rotate by a power mechanism.

5. The intermittent pneumatic pressurizing device with heat preservation function according to claim 4, characterized in that: A driving shaft (4) is provided in the main engine housing (1) parallel to the middle piston rod (37), and a driving wheel (41) for transmitting power to the driven wheel (371) is provided at a corresponding position on the driving shaft (4). The driving shaft (4) or the driving wheel (41) is driven to rotate by a power source.

6. The intermittent pneumatic pressurizing device with heat preservation function according to claim 5, characterized in that: The two ends of the driving shaft (4) extend to the ends of the first cavity (31) and the second cavity (33), respectively. The two ends of the driving shaft (4) are provided with threads with opposite screw directions, and each is provided with a matching thrust nut (5). The thrust nut (5) is slidably matched with the main body housing (1). The piston end of the third piston disc (38) is in sliding cooperation with the first cavity (31), and the tail end is in sliding cooperation with the sliding shaft (6) fixed to the main body housing (1), and the sliding position can be locked by a locking mechanism. A force ring (321) is provided on the third piston disc (38); The thrust nut (5) is provided with a thrust groove (51) which is wider than the thickness of the force ring (321). When the thrust nut (5) moves axially, two sides of the thrust groove (51) respectively contact two sides of the force ring (321) and push the third piston disc (38) to move. The fourth piston disc (39) is arranged at the end of the second cavity (33) in the same manner.

7. The intermittent pneumatic pressurizing device with heat preservation function according to claim 6, characterized in that: The locking mechanism includes a locking rod (322) and an abutment platform (511); The locking rod (322) is located inside the force ring (321) and along the radial direction of the force ring (321), with one end being able to contact the sliding shaft (6) and the other end being able to contact the abutment platform (511); The abutment platform (511) is located in the thrust groove (51), and the height of the abutment platform (511) on both sides of the thrust groove (51) is lower than that of the middle part.

8. The intermittent pneumatic pressurizing device with heat preservation function according to claim 2, characterized in that: The internal circuit (35) is provided with a heating component capable of heating the fluid flowing through it.

9. The intermittent pneumatic pressurizing device with heat preservation function according to claim 5, characterized in that: A first communicating hole (323) and a second communicating hole (324) are respectively provided at different axial positions on the first piston disc (32); one end of the first communicating hole (323) and the second communicating hole (324) are connected to the first cavity (31), and the other end faces the side wall; during the axial movement of the first piston disc (32), the first communicating hole (323) and the second communicating hole (324) can be alternately connected to the internal circuit (35) and the external circuit (36).

10. The intermittent inflation and pressurization device with heat preservation function according to claim 1, characterized in that: The air bags (21) are strip-shaped and connected in parallel.

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