CN117694992A - Anti-ice blocking method of heat exchange system - Google Patents

Abstract

The invention discloses an anti-ice blocking method of a heat exchange system, which comprises the following steps: monitoring and acquiring the pressure P1 in the cavity, the pressure P2 at the connecting end of the pipeline and the external atmospheric pressure P3; comparing P2 with P3, if P2 is less than or equal to P3, enabling the control valve to be in a communication state so that P2 after communication is close to P1; the working medium passes through the inlet pipe until the cryoablation catheter is connected after the cryoablation catheter is connected; when P2> P1, the control valve is in a closed state to purge the cryoablation catheter; working medium inflow is cut off before butt joint of the cryoablation catheter is disconnected, when P2 is detected to be reduced to be close to P3, a control valve is opened to ensure that the pressure value of the connecting end of the outlet pipe and the pipeline is always larger than the external atmospheric pressure P3, so that anti-icing blockage is realized.

Description

Anti-ice blocking method of heat exchange system

Technical Field

The invention belongs to the technical field of ablation treatment, and particularly relates to an anti-icing and blocking method of a heat exchange system for cryoablation treatment.

Background

The cryoablation treatment technology is to freeze and destroy the focus of abnormal cells or pathological tissues with extremely cold working medium to realize the aim of local minimally invasive treatment, and is widely applied to cancers, arrhythmia and other diseases. In cryoablation catheters, extremely cold working fluids, such as liquid nitrogen, are required.

In the existing cryoablation catheter, two methods are generally adopted to realize cooling of the cryoablation catheter, one method is to adopt a Joule Thomson throttling principle to obtain an extremely cold working medium, the other method is to obtain a liquid extremely cold working medium through a heat exchange mode, the former method has the defects in the aspects of working pressure, safety, economy and the like, the former method is not widely applied, and the latter method is widely adopted because of convenience, high efficiency and the like.

Although the adoption of the heat exchange mode can basically meet the requirement of preparing extremely cold working media for supporting the cryoablation catheter to carry out treatment operation, as the ablation catheter with different specifications and sizes is adopted for operation aiming at different types, different positions and different sizes of focuses for example, the heat exchange system and the ablation catheter are detachably connected; when the ablation catheter is used, the ablation catheter is connected to the output pipe of the heat exchange system, and when the surgical treatment is finished or the ablation catheters with different specifications are required to be replaced, the ablation catheter and the output pipe of the heat exchange system are disconnected, and the output pipe of the heat exchange system is communicated with air; the pipelines of the heat exchange system are formed into a cryogenic environment at the time or later, so that components such as moisture in the air are frozen when being cooled, the heat exchange system is blocked, and the next use is affected.

In order to overcome the above-mentioned drawbacks, a plug is provided at the output end of the heat exchange system to plug when needed, so as to reduce the possibility of plugging by air entering the pipeline of the heat exchange system after the connection of the ablation catheter is disconnected, but this does not thoroughly solve the problem of ice blockage. In addition, the plugging mode by the plug can also increase the operation difficulty of operators, or the condition that the plug is forgotten to be installed can also occur.

The present invention is directed to thoroughly solving the above problems and providing an anti-ice blocking method for a heat exchange system.

Disclosure of Invention

The invention aims to solve the problem that the pipeline is blocked due to ice formation caused by cold in the pipeline when air enters the pipeline in a heat exchange system, and provides an anti-blocking method of the heat exchange system.

In order to achieve the above purpose, the invention adopts the following scheme:

an anti-icing and anti-blocking method of a heat exchange system, comprising:

monitoring and acquiring the pressure P1 in the cavity of the container, and the pressure P2 and the external atmospheric pressure P3 of the pipeline connecting end of the outlet pipe; the heat exchanger is arranged in the cavity at least partially for containing a cooling medium and for the heat exchange system, so that the cooling medium is cooled and liquefied by utilizing the volatilization heat absorption of the cooling medium, and the aim of preparing the gaseous working medium into the high-pressure liquid extremely-cold working medium is fulfilled; the heat exchanger has an inlet tube and an outlet tube for connection to a source of working fluid and a cryoablation catheter, respectively.

Comparing P2 with P3 by adopting a signal comparator and/or a processing unit, if P2 is less than or equal to P3, enabling a control valve to be in a communication state, so that the pipeline connecting end is communicated with the containing cavity through the control valve, and the communicated P2 is close to P1; the control valve is arranged on a first controlled pipeline arranged between the pipeline connecting end and the containing cavity and used for controlling the connection or disconnection of the pipeline to be respectively formed into an open state or a cut-off state, the control valve is communicated with the pipeline connecting end and the containing cavity in the open state, and the connection between the pipeline connecting end and the containing cavity is cut off in the closed state.

After the pipeline connecting end is in butt joint with the cryoablation catheter, the working medium passes through the inlet pipe until reaching the cryoablation catheter; in the process, monitoring the pressure P2 of the pipeline connecting end and the pressure P1 in the containing cavity; when P2> P1, the control valve is in a closed state so as to purge the cryoablation catheter by using the high pressure of the working medium.

Before the butt joint of the pipeline connecting end and the cryoablation catheter is disconnected, working medium inflow is cut off, and when the pressure P2 of the pipeline connecting end is monitored to be reduced to be close to the external atmospheric pressure P3, the control valve is opened to be communicated with the pipeline connecting end and the containing cavity through the first controlled pipeline, so that the pressure value of the outlet pipe and the pipeline connecting end is always larger than the external atmospheric pressure P3, and anti-icing blocking is realized.

After the technical scheme is adopted, on the basis of a traditional heat exchange system for preparing a freezing medium by volatilizing a cooling medium, the connection state of the control valve is regulated by monitoring and acquiring the pressure P2 of the pipeline connection end and the external atmospheric pressure P3 so as to purge by utilizing the vaporized air pressure P1 in the cavity, thereby realizing the purpose of ice blockage prevention.

The method according to above, wherein: the control valve is a controlled valve member to allow the control valve member to be opened or closed according to a control signal to change the communication state of the control valve member to be opened or closed.

The method according to above, wherein: the state of the control valve is controlled by an electric signal or a pneumatic signal, for example, an electric signal or a pneumatic signal is input as a control signal. When P2 is less than or equal to P3, the control valve is in a communication state, so that the pipeline connecting end is communicated to the containing cavity through the control valve, and the communicated P2 is close to P1; otherwise, the control valve is in a disconnection state, and the pipeline connecting end is not communicated with the containing cavity.

The method according to above, wherein: and a second controlled pipeline is arranged between the pipeline connecting end and the containing cavity, and a one-way valve is arranged on the second controlled pipeline so that the one-way valve is opened by utilizing the pressure generated by vaporization of a liquid cooling medium such as liquid nitrogen arranged in the containing cavity, so that the pressure of the pipeline connecting end is always greater than the external atmospheric pressure P3, and ice blockage still does not occur under the shutdown state of the heat exchanger system.

The method according to above, wherein: the connecting part of the pipeline connecting end and the cryoablation catheter is provided with a sensor for detecting whether the pipeline connecting end and the cryoablation catheter are in a connecting state, when the pipeline connecting end and the cryoablation catheter are in the connecting state, the sensor generates a first sensing signal, and when the pipeline connecting end and the cryoablation catheter are in the disconnecting state, the sensor generates a second sensing signal for detecting whether the cryoablation catheter is connected. The method can be used for detecting the connection state of the cryoablation catheter in a complementary way, and can be used for assisting diagnosis and early warning.

The method according to above, wherein: a flow control mechanism and/or a pressure control mechanism is provided for controlling the flow or pressure of the gas flowing through the control valve such that the flow or pressure of the purge gas flow is within a preset range.

The method according to above, wherein: the opening degree of the control valve can be adjusted to adjust the flow rate or the pressure by using the opening degree of the control valve.

The method according to above, wherein: and a signal comparator and/or a processing unit are/is also used for comparing the P1 with the P3, and if the P1 descends to be close to the P3, the under-voltage warning is realized through an acousto-optic warning or an alarm signal to the control unit.

The method according to above, wherein: p2 after communication is close to P1, P2 is reduced to be close to P3, or P1 is reduced to be close to P3, and the difference between the two is less than 5-10%. That is, when the same units are used, the numerical value difference between the two is 5 to 10% as the corresponding control threshold.

The method according to above, wherein: the control valve is an electric normally open valve, and is in a communicating state when in a power-off state. When the equipment is powered off, the electric normally open valve can be kept in an open state, so that the pipeline connecting end can be continuously purged, and blockage is prevented.

The anti-ice blocking method of the heat exchange system has at least the following beneficial effects:

1. the pressure P1 in the cavity, the pressure P2 at the pipeline connecting end and the external atmospheric pressure P3 are monitored and obtained, P2 and P3 are compared, when P2 is less than or equal to P3, the control valve is in a communication state to communicate the pipeline connecting end with the cavity, so that the communicated P2 is close to P1 and is higher than P3 based on P1, and therefore medium in the cavity can be utilized for purging, and the defect of ice blockage caused by cold and icing of moisture and the like in air is avoided.

2. The control valve is preferably an electric valve or a pneumatic valve, so that the control valve can be opened or closed as required in response to a control signal, and the aim of purging control is fulfilled. Preferably, the control valve is an electric normally open valve, and is in a connection state when in a power-off state, so that the first controlled pipeline is in a connection state when the equipment is powered off, and the connecting end of the pipeline can be continuously purged to prevent ice blockage.

3. When the pipeline connecting end is in butt joint with the cryoablation catheter, the pressure P2 of the pipeline connecting end is gradually increased, when P2 is more than P1, the control valve is adjusted to be in a closed state, and the cryoablation catheter is purged by using the high pressure of working medium, so that the normal work of the cryoablation catheter is realized.

4. Before the butt joint of the pipeline connecting end and the cryoablation catheter is disconnected, the inflow of working medium is cut off, the pressure P2 of the pipeline connecting end is gradually reduced, when the pressure P2 of the pipeline connecting end is monitored to be reduced to be close to the external atmospheric pressure P3, the control valve is opened to communicate the pipeline connecting end with the cavity through the first controlled pipeline, the pressure value of the outlet pipe and the pipeline connecting end is ensured to be always larger than the external atmospheric pressure P3, and therefore anti-icing and blocking are achieved.

5. Preferably, a second controlled pipeline is further arranged between the pipeline connecting end and the containing cavity, a one-way valve is arranged on the second controlled pipeline, so that the one-way valve is opened by utilizing liquid cooling medium in the containing cavity, such as liquid nitrogen, and the pressure generated by vaporization, when P2 is less than or equal to P3, the one-way valve is opened so that the communicated P2 is close to P1, the pressure of the pipeline connecting end is always greater than the external atmospheric pressure P3, and ice blockage still does not occur under the shutdown state of the heat exchanger system.

6. More preferably, the flow control mechanism or the pressure control mechanism is further arranged on the air blowing component and used for adjusting the flow or the pressure of the air in the air blowing pipeline, so that the whole system can simultaneously ensure that the blowing time is as long as possible under the condition of meeting the requirement of blowing, and the influence on the anti-icing and blocking effect caused by the exhaustion of the air pressure in the cavity is avoided.

7. Preferably, the invention also compares the monitored P1 with the monitored P3, and if the P1 descends to be close to the P3, the under-voltage warning is realized through the acousto-optic warning or the warning signal to the control unit.

8. The method of the invention can be used as a complete application method as a whole, and can also be applied to the existing container to realize the improvement of the container of the existing heat exchange system and the improvement of the anti-icing and blocking effects.

Drawings

FIG. 1 is a schematic diagram of an anti-icing method according to an embodiment of the present invention;

fig. 2 is a schematic diagram of another embodiment of the present invention.

The heat exchanger comprises a container 10, a heat exchange assembly 20, a blowing assembly 30, a blowing pipeline 31, a control valve 32, a one-way valve 33, cavities 101 and Rong Qiangkou 102, a cover body 103, a heat exchanger 201, an inlet pipe 202, an outlet pipe 203 and a pipeline connecting end 204.

Detailed Description

The invention will be described in detail below with respect to certain specific embodiments thereof in order to better understand the invention and thereby to more clearly define the scope of the invention as claimed. It should be noted that the following description is only some embodiments of the inventive concept and is only a part of examples of the present invention, wherein the specific direct description of the related structures is only for the convenience of understanding the present invention, and the specific features do not naturally and directly limit the implementation scope of the present invention. Conventional selections and substitutions made by those skilled in the art under the guidance of the inventive concept should be considered as being within the scope of the claimed invention.

The anti-ice blocking method of the heat exchange system is applied to the heat exchange system of the cryoablation catheter, is used for stably, conveniently and efficiently providing extremely cold working medium for the ablation catheter, and can avoid the problem of ice blocking of a liquid outlet pipe in daily use, so that the cryoablation treatment operation can be safely and quickly completed, the operation labor intensity of operators is not increased in the process, and the phenomena of forgetting operation and the like are not easy to occur.

The method comprises the following steps:

monitoring and acquiring the pressure P1 in the cavity 101 of the container 10 and the pressure P2 and the external atmospheric pressure P3 of the pipe connection end 204 of the outlet pipe 203; the pressure detection is performed, for example, by a pressure gauge or a pressure sensor. And, continuous monitoring and measurement is performed during the implementation of the method.

The signal comparator and/or the processing unit are/is used for comparing the P2 and the P3, the signal comparator can output different comparison signals according to the relative sizes of the P1 and the P3, and the processing unit can be a control unit for receiving the sensing signals of the P1 and the P3 and outputting control signals to control the opening and closing of the control valve 32. If P2 is less than or equal to P3, the control valve 32 is in a communication state, so that the pipeline connecting end 204 is communicated to the cavity 101 through the control valve 32, and the communicated P2 is close to P1. Wherein, the P2 after communication is close to P1, which means that the relative pressure difference between the two is not more than a preset threshold value, such as not more than 5-10%.

When the tubing connection 204 is docked with the cryoablation catheter (not shown), the working fluid (i.e., gaseous cryogenic working fluid) is released through the inlet tube 202 to the cryoablation catheter; in the process, the pressure P2 of the pipe connection end 204 and the pressure P1 in the cavity 101 are monitored; when P2> P1, the control valve 32 is brought to a closed state to purge the cryoablation catheter with the high pressure of the working fluid.

Before the butt joint of the pipeline connecting end 204 and the cryoablation catheter is disconnected, working medium inflow is blocked, when the pressure P2 of the pipeline connecting end 204 is monitored to be reduced to be close to the external atmospheric pressure P3, the control valve 32 is opened to communicate the pipeline connecting end 204 with the cavity 101 through a first controlled pipeline, the first controlled pipeline is formed by an air blowing pipeline 31, the pressure value of the outlet pipe 203 and the pipeline connecting end 204 is ensured to be always larger than the external atmospheric pressure P3, and the inflow of external air from the pipeline connecting end 204 is prevented, so that the anti-icing blocking is realized.

Wherein the control valve 32 is a controlled valve, such as a solenoid valve or a pneumatic valve, so as to control the state of the control valve 32 to be opened or closed by using an electric signal or a pneumatic signal.

When P2 is less than or equal to P3, the control valve 32 is in a communication state, so that the pipeline connecting end 204 is communicated to the accommodating cavity 101 through the control valve 32, and the communicated P2 is close to P1. Wherein, P2 after communication is close to P1, which means that the relative pressure difference between the two is not more than a preset threshold value, for example not more than 5-10%.

To this end, this can be achieved in two ways. Preferably, the processing unit is formed by a control unit, which is communicatively connected to the sensor and the control valve 32, respectively, including an electrical connection or a pneumatic connection. For this purpose, two pressure sensors may be provided to detect the pressure values in the cavity 101 and in the outlet pipe 203 or the pipe connection end 204, respectively, and send two pressure sensing signals to the control unit, respectively, and the control unit compares the magnitudes of the two signals and then generates corresponding control signals. Alternatively, the two pressure sensing signals are connected to a comparator, and the comparator is connected to the control unit so that the control unit can make a control signal accordingly according to the comparison result, thereby placing the control valve 32 in an open state or a closed state.

In some embodiments, a flow control mechanism and/or pressure control mechanism is also provided for controlling the flow or pressure of the gas flowing through the control valve 32 such that the flow or pressure of the purge gas flow is within a preset range. Too small flow/pressure is difficult to achieve the due purging effect, while too large flow/pressure may cause damages to personnel or equipment on the one hand, and on the other hand, the medium in the cavity 101 is also greatly consumed in a short time, so that the anti-icing blocking duration is not good.

Optimally, the control valve 32 is an opening-adjustable electromagnetic valve or a pneumatic valve, so that the opening of the control valve is utilized to adjust the flow or the pressure of the purging in a stepping way, the purging effect and the duration are considered, and the actual application needs are met.

In other embodiments, a sensor is provided at the junction of the conduit connection end 204 and the cryoablation catheter to detect whether the two are in a connected state, the sensor generating a first sensing signal when the two are in a connected state and a second sensing signal when the two are in a disconnected state for detecting whether the cryoablation catheter is connected, which may be used as an aid to the operation of the control unit, for example to indicate whether the cryoablation catheter is connected, or that P2 is lower than P3 in a connected state to indicate device damage or connection leakage.

In other embodiments, the signal comparator and/or the processing unit is further used to compare P1 with P3, and if P1 falls close to P3, an under-voltage warning is implemented by an acousto-optic warning or an alarm signal is generated to the control unit. Wherein, P1 decreases to be close to P3, which means that the relative pressure difference between the two does not exceed a preset threshold value, such as not more than 5-10%.

As shown in fig. 2, in other embodiments, a second controlled pipeline (i.e., a second purge pipeline) is further disposed between the pipeline connection end 204 and the cavity 101, and the second controlled pipeline is provided with a check valve 33, so that the check valve 33 is opened by using pressure generated by vaporization of a liquid cooling medium (optimally, liquid nitrogen) disposed in the cavity 101, so that the pressure P2 of the pipeline connection end 204 after being communicated is always greater than the external atmospheric pressure P3, and no ice blockage still occurs in the shutdown state of the heat exchanger system. Of course, in other embodiments, the check valve 33 may also be disposed on the first controlled pipeline and parallel to the control valve 32, when P2 is less than or equal to P1, the check valve 33 is opened to connect the pipeline connection end 204 with the cavity 101, so that the pressure P2 of the connected pipeline connection end 204 is always greater than the external atmospheric pressure P3, and the anti-ice blocking effect can be still achieved in the shutdown state.

For this purpose, the check valve 33 can determine whether it is in the on state or the off state according to the pressure values in the chamber 101 and the outlet pipe 203. When the heat exchange system works normally, the working medium passes through the inlet pipe 202 to the cryoablation catheter, the pressure of the outlet pipe 203 is larger than that of the cavity 101 so that the one-way valve 33 is in a disconnected state, and at the moment, the gas in the cavity 101 cannot enter the outlet pipe 203 through the second controlled pipeline, and the air blowing assembly 30 is in an off-line state.

After the working medium is blocked, the working medium is not supplied to the inlet pipe 202, the pressure P2 of the pipe connection end 204 gradually drops until the working medium approaches the external atmospheric pressure P3 (the pressure is basically equal to the atmospheric pressure in comparison with the state above) so that the pressure of the outlet pipe 203 is smaller than the pressure of the cavity 101, the one-way valve 33 can be automatically switched to the on state so that the second controlled pipe is in the on state, the gas in the cavity 101 enters the outlet pipe 203 through the second controlled pipe and finally is discharged into the atmosphere through the pipe connection end 204, so that the purging of the outlet pipe 203 and the pipe connection end 204 is realized to prevent the air from entering, and the problem of ice blockage caused by cold and icing of moisture and the like in the air in the next use is avoided because no air enters the outlet pipe 203. And, this process is independent of the state of the control valve 32, so that it can be supplemented, ensuring that the anti-icing process is not affected even when the device is powered down.

In the above method, the heat exchange system to be combined therewith has the following specific structure.

As shown in fig. 1, the heat exchange system is comprised of a vessel 10 and a heat exchange assembly 20.

The container 10 is preferably made of a heat-insulating material, and has a cavity 101 and a cover 103 sealed at a cavity opening 102 formed therein, so that the cavity 101 is formed in the container 10. The heat exchange assembly 20 has a heat exchanger 201 with a certain heat exchange area and a heat exchange pipeline connected to the heat exchanger 201 to input and output medium to and from the heat exchanger, the heat exchange pipeline comprises an inlet pipe 202 and an outlet pipe 203, the inlet pipe 202 is used for inputting working medium into the heat exchanger 201, the outlet pipe 203 is used for outputting working medium in the heat exchanger 201, and a pipeline connecting end 204 is formed at the tail end of the outlet pipe 203 and is used for abutting a freezing ablation catheter.

In the method of the present invention, the inlet pipe 202 and the outlet pipe 203 of the heat exchange assembly 20 are arranged on the cover 103 in a penetrating manner, so that the assembled heat exchanger 201 is positioned in the cavity 101 and is positioned in the middle or the middle lower position, the heat exchanger 201 can be immersed in a cooling medium contained in the cavity 101 to be cooled by heat exchange, the outer walls of the inlet pipe 202 and the outlet pipe 203 are hermetically connected with the cover 103, so that the cover 103 can seal the cavity opening 102 of the cavity 101, and a safety valve and/or a fluid supplementing opening (not shown) can be further arranged on the cover 103. The air blowing pipeline 31 of the air blowing assembly 30 also penetrates through the cover 103 and then is communicated into the cavity 101, and the outer wall of the air blowing pipeline 31 is hermetically connected with the cover 103, so that the air blowing pipeline 31 forms a first controlled pipeline.

In other cases, the height of the heat exchanger 201 in the cavity 101 is adjustable, which can be achieved by sliding the inlet pipe 202 and the outlet pipe 203 up and down on the cover 103 to adjust the height of the heat exchanger 201 in the cavity 101, or by arranging the cover 103 to be composed of two telescopic parts, fixing the inlet pipe 202 and the outlet pipe 203 on the cover 103, and adjusting the inlet pipe 202 and the outlet pipe 203 by adjusting the two parts of the cover 103 when the adjustment is needed. The height of the heat exchanger 201 in the accommodating cavity 101 is adjusted, so that the heat exchanger 201 can adapt to the liquid level change in the accommodating cavity 101 on one hand, and the heat exchange efficiency can be properly changed on the other hand.

In this embodiment, the heat exchange system also has a blowing assembly 30 therein. The air blowing assembly 30 includes a first purging pipe connected between the cavity 101 and the outlet pipe 203, so as to communicate the cavity 101 with the pipe connection end 204 of the outlet pipe 203 when needed, so as to purge the outlet pipe 203 and the pipe connection end 204 by using the medium vaporized in the cavity 101, and avoid air entering the outlet pipe 203 or the heat exchanger 201 through the pipe connection end 204, thereby achieving the purpose of anti-icing and blocking.

In one embodiment, the air-blowing assembly 30 includes an air-blowing line 31, the air-blowing line 31 constituting the first controlled line. One end of the air blowing pipe 31 is connected to the chamber 101, the other end is connected to the outlet pipe 203, and a control valve 32 for controlling on/off of the air blowing pipe 31 is also installed on the air blowing pipe 31.

In the preferred embodiment, the connection between the air blowing pipe 31 and the outlet pipe 203 is at a distance from the pipe connection end 204 of the outlet pipe 203, and the distance should be moderate, and too small a distance will result in too short a path of the purge flow through the outlet pipe 203, so that the moisture in the air may exceed the connection and not be purged well at the moment of disconnection, and too large a distance will cause the outlet pipe 203 to be too long or the pressure loss to greatly affect the purging effect.

Claims (9)

1. An anti-icing and anti-blocking method of a heat exchange system, comprising:

monitoring and acquiring the pressure P1 in the cavity (101) of the container (10) and the pressure P2 and the external atmospheric pressure P3 of the pipeline connecting end (204) of the outlet pipe (203);

comparing P2 with P3 by adopting a signal comparator and/or a processing unit, if P2 is less than or equal to P3, enabling a control valve (32) to be in a communication state, so that the pipeline connecting end (204) is communicated with the containing cavity (101) through the control valve (32), and enabling the communicated P2 to be close to P1;

after the pipeline connecting end (204) is in butt joint with the cryoablation catheter, the working medium passes through the inlet pipe (202) until reaching the cryoablation catheter; during this process, the pressure P2 of the line connection (204) and the pressure P1 in the chamber (101) are monitored; when P2> P1, the control valve (32) is in a closed state so as to purge the cryoablation catheter by using high pressure of working medium;

before the butt joint of the pipeline connecting end (204) and the cryoablation catheter is disconnected, working medium inflow is cut off, and when the pressure P2 of the pipeline connecting end (204) is monitored to be reduced to be close to the external atmospheric pressure P3, the control valve (32) is opened to communicate the pipeline connecting end (204) with the containing cavity (101) through a first controlled pipeline, so that the pressure value of the outlet pipe (203) and the pipeline connecting end (204) is always larger than the external atmospheric pressure P3, and anti-icing blocking is realized.

2. An anti-ice-blocking method of a heat exchange system according to claim 1, wherein the control valve (32) is a controlled valve member to be opened or closed in accordance with a control signal.

3. The method of ice blocking prevention of a heat exchange system according to claim 2, wherein the state of the control valve (32) is controlled by an electric signal or a pneumatic signal, and the control valve (32) is brought into a connected state when p2.ltoreq.p3, and is otherwise brought into a disconnected state.

4. A method of ice-blocking prevention for a heat exchange system according to any one of claims 1-3, further comprising providing a second controlled conduit between the conduit connection end (204) and the chamber (101), said second controlled conduit being provided with a one-way valve (33) for opening said one-way valve (33) by means of a pressure generated by vaporization of a liquid cooling medium provided in the chamber (101), such that the pressure at the conduit connection end (204) is always greater than the ambient atmospheric pressure P3, whereby no ice-blocking is still occurring in the shutdown state of the heat exchanger system.

5. The method of claim 1, wherein a sensor is provided at the junction of the conduit connection (204) and the cryoablation catheter to detect whether the two are in a connected state, the sensor generating a first sensing signal when the two are in a connected state and a second sensing signal when the two are in a disconnected state for detecting whether the cryoablation catheter is connected.

6. An anti-ice-blocking method of a heat exchange system according to claim 1, further comprising a flow control mechanism and/or a pressure control mechanism for controlling the flow or pressure of the gas flowing through the control valve (32) such that the flow or pressure of the purged gas flow is within a preset range.

7. The ice blocking prevention method of a heat exchange system according to claim 6, wherein an opening degree of the control valve (32) is adjustably set to adjust a flow rate or a pressure using the opening degree of the control valve (32).

8. The method for preventing ice blockage of a heat exchange system according to claim 1, wherein a signal comparator and/or a processing unit is further used for comparing P1 with P3, and if P1 falls close to P3, an under-voltage warning is realized by an acousto-optic warning or an alarm signal to a control unit.

9. The method of preventing ice blockage of a heat exchange system according to claim 1 or 8, wherein P2 after communication is close to P1, P2 is reduced to be close to P3, or P1 is reduced to be close to P3, and the difference between the two is less than 5-10%; the control valve (32) is an electric normally open valve which is in a communicating state when in a power-off state.