A balance cavity seal, a balance cavity assembly and a leakage detection method thereof

Abstract

The present invention relates to the technical field of hemodialysis, and particularly relates to a balance chamber seal, a balance chamber assembly and a leakage detection method thereof. The balance chamber seal is used to replace the existing diaphragm to separate the balance chamber into a first cavity and a second cavity, so that the liquids in the first cavity and the second cavity can independently achieve liquid inlet and liquid outlet. At the same time, the liquid inlet volume and the liquid outlet volume in the first cavity and the second cavity are balanced. The present invention also provides a balance chamber assembly and a leakage detection method thereof. The service life and balance accuracy of the balance chamber assembly are better than those of the existing diaphragm, and through the leakage detection method, the leakage state of the balance chamber seal in the balance chamber assembly can be timely detected.

Description

Technical Field

[0001] The present invention relates to the technical field of hemodialysis, and particularly to a balance chamber seal, a balance chamber assembly and a leakage detection method thereof. Background Art

[0002] During the treatment process of blood purification equipment, the key to precise volume control of a hemodialysis machine is the balance chamber system. The commonly used balance chamber system at present is generally a membrane type dialysis fluid balance chamber. For example, a volume balance and ultrafiltration device for blood purification disclosed in a Chinese invention patent with the publication number CN1872357A has a cavity inside the volume balancer assembly, and the cavity is divided into a dialysis fluid chamber and a waste fluid chamber by a diaphragm; the dialysis fluid inlet of the dialysis fluid chamber is connected to a dialysis fluid inlet joint, and the dialysis fluid outlet is connected to a dialysis fluid outlet joint; the waste fluid inlet of the waste fluid chamber is connected to a waste fluid inlet joint, and the waste fluid outlet is connected to a waste fluid outlet joint. Solenoid valves are installed at each liquid inlet and outlet of the volume balancer assembly for flow control, so as to achieve the balance of the liquid inlet and outlet volumes in the liquid chamber and the waste fluid chamber, ensure that the fresh dialysis fluid entering the dialysis fluid chamber of the balance chamber system is equal to the waste fluid discharged from the waste fluid chamber, and facilitate the precise control of the dialysis fluid flow rate.

[0003] The balance chamber systems in the prior art generally use the above-mentioned membrane type dialysis fluid balance structure, but this membrane type dialysis fluid balance structure also has certain defects. For example: the contact surface between the balance chamber diaphragm and the liquid medium in the water circuit system is large. To facilitate pushing the membrane and reduce the membrane pushing pressure, the selection of the diaphragm material and thickness is limited. At the same time, the liquid medium transported by the water circuit system contains polar media such as disinfectant, which will penetrate and swell the diaphragm. In addition, during the operation of the diaphragm, there is a certain amount of stretching and deformation, and the turbulences caused by the liquid inlet, outlet and flow interruption on both sides of the diaphragm will form a local pulling force on the diaphragm. The above factors will all accelerate the penetration and swelling of the liquid medium to the diaphragm, weaken the diaphragm life, and cause the diaphragm to rupture. The rupture and seal failure leakage of the diaphragm will both lead to the deviation of the ultrafiltration accuracy, resulting in over-ultrafiltration and under-ultrafiltration phenomena, and the rupture of the diaphragm will cause the cross-flow of dialysis fluid and waste fluid, requiring the treatment to be stopped and corrected in time. Therefore, the diaphragm life in the balance chamber assembly has become the shortcoming of the balance chamber assembly and urgently needs to be optimized.

[0004] Meanwhile, restricted by the diaphragm of the balance chamber, once the diaphragm ruptures, it is difficult to detect and monitor in a timely manner, which may further lead to serious consequences. Therefore, how to detect and give an early warning in time when the diaphragm ruptures is one of the problems that need to be solved urgently at present. The Chinese invention patent with the publication number CN102908686B discloses a leakage detection system for the balance chamber used in blood purification. Its leakage detection principle is as follows: when the diaphragm inside the balance chamber is intact, since both the chamber body and the diaphragm are insulating materials, the liquid media on both sides of the diaphragm cannot conduct. When the diaphragm ruptures, the media at both ends are interconnected, and the signals of the monitoring electrodes at both ends are connected, so as to judge that the diaphragm has ruptured, thus realizing the monitoring of the diaphragm condition. However, this monitoring method uses the detection of electrical signals to detect whether the diaphragm ruptures during the treatment process in real time, which can improve the safety of the treatment. However, this monitoring method still has the problem of low sensitivity in actual use. The main reason is that the monitoring electrodes at both ends are located at the outer end of the solenoid valve of the balance chamber assembly. When the diaphragm has a small rupture, due to the too far distance between the monitoring electrodes at both ends and the weak electrical signal, the alarm cannot be issued in time and accurately. Summary of the Invention

[0005] To solve the above technical problems, the purpose of the present invention is to provide a balance chamber seal, a balance chamber assembly and its leakage detection method to solve the problems existing in the prior art.

[0006] To achieve the above technical effects, the present invention adopts the following technical solutions:

[0007] In the first aspect, the present invention provides a balance chamber seal, which is used to be installed in the balance chamber and used to divide the balance chamber into independent first and second chambers. It is characterized in that the balance chamber seal includes:

[0008] A first seal, the first seal having a first sealing end face facing the first chamber;

[0009] A second seal, which can be fixed to one side of the first seal and the second seal having a second sealing end face facing the second chamber;

[0010] When the second seal is fixed to one side of the first seal, an inner chamber independent of the first and second chambers is formed between the first seal and the second seal.

[0011] Further, both the first sealing end face and the second sealing end face are rigid sealing faces.

[0012] Further, the first seal includes a first rigid seal body and a first sealing ring disposed around the outer peripheral surface of the first rigid seal body. The outer peripheral surface of the first rigid seal body is in clearance fit with the inner surface of the balance chamber, and the outer end surface of the first sealing ring is in interference fit with the inner surface of the balance chamber; the second seal includes a second rigid seal body and a second sealing ring disposed around the outer peripheral surface of the second rigid seal body. The outer peripheral surface of the second rigid seal body is in clearance fit with the inner surface of the balance chamber, and the outer end surface of the second sealing ring is in interference fit with the inner surface of the balance chamber. The first sealing ring and the second sealing ring are parallel to each other, and the inner chamber is formed between the first sealing ring and the second sealing ring.

[0013] Further, a first groove is provided on the outer peripheral surface of the first rigid seal body, and a part of the first sealing ring is embedded in the first groove. A second groove is provided on the outer peripheral surface of the rigid seal body, and a part of the second sealing ring is embedded in the second groove.

[0014] Further, the balance chamber seal further includes an internal connecting member. The internal connecting member is disposed in the inner chamber, and a first convex portion and a second convex portion are respectively provided at both ends of the internal connecting member. The first rigid seal body and the second rigid seal body are respectively fixedly connected to the first convex portion and the second convex portion.

[0015] Further, when the first rigid seal body and the second rigid seal body are respectively mounted on the first convex portion and the second convex portion, an isolation is formed between the first rigid seal body and the second rigid seal body through the internal connecting member.

[0016] Further, the first rigid seal body and the second rigid seal body are respectively connected to the first convex portion and the second convex portion by any one of connection methods such as threaded connection, pin connection, snap connection, and bonding.

[0017] Preferably, the first rigid body and the second rigid body are respectively fixedly connected to the first convex portion and the second convex portion by means of pin connection, and the pin connection is locked by a locking pin.

[0018] In a second aspect, the present invention further provides a balance chamber assembly. The balance chamber assembly includes the above-mentioned balance chamber seal, and further includes a hollow main housing. First end covers and second end covers are respectively provided at both ends of the main housing. A balance chamber is formed between the main housing and the first end cover and the second end cover. The balance chamber seal is slidably installed in the balance chamber, and the outer end surfaces of the first sealing ring and the second sealing ring are in interference fit with the inner surface of the main housing.

[0019] Further, at least one first liquid flow hole communicating with the external environment is provided on the first end cover, and at least one second liquid flow hole communicating with the external environment is provided on the second end cover.

[0020] Further, two groups of first liquid flow holes are provided on the first end cover in total, and the two groups of first liquid flow holes are respectively used for liquid inlet and liquid outlet. Two groups of second liquid flow holes are provided on the second end cover in total, and the two groups of second liquid flow holes are respectively used for liquid inlet and liquid outlet. Preferably, liquid delivery pipelines are provided at the first liquid flow holes and the second liquid flow holes, and electromagnetic valves can be arranged on the liquid delivery pipelines.

[0021] Further, the first end cover and the second end cover are respectively detachably installed at both ends of the main housing, and sealing members are provided at the joints of the first end cover and the main housing and the joints of the second end cover and the main housing.

[0022] Further, the first end cover and the second end cover are respectively fixedly connected to both ends of the main housing through a plurality of threaded connectors.

[0023] Further, the balance chamber assembly further includes a physical limit component. The physical limit component includes a first limit block and a second limit member. The first limit member and the second limit member are respectively arranged at both ends of the balance chamber. The balance chamber seal can slide between the first limit member and the second limit member.

[0024] Further, one end of the first limit member is fixedly connected to the inner side surface of the first end cover, and the other end is provided with a first contact surface that can contact the balance chamber seal. One end of the second limit member is fixedly connected to the inner side surface of the second end cover, and the other end is provided with a second contact surface that can contact the balance chamber seal.

[0025] Further, the balance chamber seal assembly further includes a power supply component and a controller. Two poles of the power supply component are respectively connected to the first end cover and the second end cover to form a test circuit, and a detection unit is provided on the test circuit. The detection unit is used to detect whether an electric signal is generated in the test circuit.

[0026] Further, the detection unit is electrically connected or signal-connected to a controller. The output end of the controller is connected to an alarm, so that when an electric signal is generated in the test circuit, the controller controls the alarm to emit a warning signal.

[0027] Further, the detection unit can be any one of measuring instruments such as an ammeter, a voltmeter, or a multimeter.

[0028] Thirdly, the present invention also provides a leakage detection method for a balance chamber assembly, which is used to detect whether there is leakage in the balance chamber seal of the above-mentioned balance chamber assembly. The leakage detection method of the balance chamber assembly specifically includes the following steps:

[0029] S1: Connect the first rigid sealing body and the second rigid sealing body through an internal connecting piece to form the balance chamber seal, and then slidably install the balance chamber seal inside the balance chamber, and make it reciprocally slidable between the first limiting piece and the second limiting piece. At the same time, the balance chamber seal divides the balance chamber and forms two independent first chambers and second chambers at both ends of the balance chamber respectively. Among them, an insulating layer is provided on the outer surface of the internal connecting piece or the internal connecting piece is made of insulating material as a whole, so as to block the electrical conduction between the first rigid sealing body and the second rigid sealing body by using the internal connecting piece;

[0030] S2: Connect the first end cover to the positive or negative pole of the power supply assembly, and connect the second end cover to the negative or positive pole of the power supply assembly correspondingly to construct a test circuit. Among them, a conductive layer is provided on the outer surface of the first end cover or the second end cover, or the first end cover and the second end cover are made of conductor material as a whole. An insulating layer is provided on the outer surface of the main housing or the main housing is made of insulating material as a whole to block the electrical conduction between the first end cover and the second end cover;

[0031] S3: Inject conductive liquid into the first chamber and the second chamber respectively through the first liquid flow hole and the second liquid flow hole, and detect whether there is an electrical signal in the test circuit through the detection unit, so as to judge the sealing state of the first sealing ring and the second sealing ring; when there is an electrical signal in the test circuit, it is determined that at least one of the first sealing ring and the second sealing ring leaks.

[0032] Further, it also includes the step:

[0033] When it is determined that at least one of the first sealing ring and the second sealing ring leaks, the controller controls the alarm to emit a warning signal.

[0034] Compared with the prior art, the beneficial effects of the present invention are:

[0035] In a first aspect, a balance chamber seal provided by the present invention is jointly composed of a first seal and a second seal. The first seal has a first sealing end face, and the second seal has a second sealing end face. By using this balance chamber seal to enclose and partition the balance chamber instead of a traditional diaphragm, since both the first sealing end face and the second sealing end face are rigid sealing surfaces, the first rigid sealing end face and the second rigid sealing end face are not affected by the inflow and outflow liquid turbulence in the first chamber and the second chamber, and its balance accuracy is relatively high. At the same time, different from the traditional diaphragm sealing method, the first seal and the second seal are not easily broken or damaged, so that the service life of this balance chamber seal is greatly improved, ensuring the safety of treatment. Moreover, the consumable cost of dialysis treatment is reduced.

[0036] In a second aspect, a balance chamber assembly provided by the present invention forms a balance chamber inside by setting a main housing, a first end cover and a second end cover. By using the above-mentioned balance chamber seal to partition the balance chamber, the balance chamber forms a first chamber and a second chamber on both sides of the balance chamber seal respectively. The first chamber and the second chamber independently realize liquid inflow and outflow. And because the balance chamber seal can slide relative to the main housing, the inflow volume and outflow volume of the first chamber and the second chamber can be kept balanced, and the balance accuracy is relatively high, and the overall service life of the balance chamber assembly is relatively high. In addition, by forming an inner chamber inside the balance chamber seal, the first chamber and the second chamber are further isolated through this inner chamber. In the case of the failure of the first seal or the second seal, the setting of this inner cavity can effectively prevent the liquid in the first chamber and the second chamber from flowing through, greatly improving the safety of the treatment process.

[0037] In a third aspect, the present invention also provides a leakage detection method for a balance chamber assembly. The leakage detection method for the balance chamber assembly can detect the leakage state of the balance chamber seal located inside the balance chamber assembly. Specifically, in the case of the failure of the first seal or the second seal, the liquid in the first chamber or the second chamber can penetrate into the inner cavity and make the first seal and the second seal conduct. Since the first seal and the second seal are conducted, it further makes the entire test circuit composed of a power supply component, a first end cover and a second end cover conduct and generate an electrical signal in this test circuit. Therefore, the leakage state of the balance chamber seal can be detected in time, so as to facilitate timely correction of the above-mentioned leakage situation during the treatment process and ensure the safety of the treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the overall structure of a balance chamber seal provided by an embodiment of the present invention;

[0039] Figure 2Schematic longitudinal sectional structure diagram of a balance cavity seal provided by an embodiment of the present invention;

[0040] Figure 3 Schematic overall structure diagram of a balance cavity assembly provided by an embodiment of the present invention;

[0041] Figure 4 Top view of a balance cavity assembly provided by an embodiment of the present invention;

[0042] Figure 5 Schematic sectional structure diagram of a balance cavity assembly at A - A provided by an embodiment of the present invention;

[0043] Reference numerals are: 11, the first seal; 111, the first rigid seal main body; 111a, the first seal end face; 112, the first sealing ring; 12, the second seal; 121, the second rigid seal main body; 121a, the second seal end face; 122, the second sealing ring; 13, the internal connecting member; 13a, the first convex portion; 13b, the second convex portion; 14, the locking pin; 20, the main housing; 21, the first end cover; 211, the first liquid flow hole; 212, the first cavity; 22, the second end cover; 221, the second liquid flow hole; 222, the second cavity; 23, the threaded connecting member; 24, the elastic sealing ring; 31, the first limiting block; 31a, the first contact surface; 32, the second limiting member; 32a, the second contact surface. Detailed implementation manners

[0044] The embodiments of the technical solutions of the present invention will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present invention more clearly, so they are only examples and cannot be used to limit the protection scope of the present invention.

[0045] Embodiment 1

[0046] As Figure 1-2 shown, the following is the first embodiment of the present invention. This embodiment provides a balance cavity seal, which can be installed in the balance cavity instead of the diaphragm, thereby dividing the balance cavity into a first cavity 212 and a second cavity 222. The first cavity 212 and the second cavity 222 are used to independently accommodate liquids. Specifically, the first cavity 212 is used to accommodate dialysis fluid, while the second cavity 222 is used to accommodate waste fluid. In actual implementation, the types of solutions in the first cavity 212 and the second cavity 222 can be adjusted as needed.

[0047] In this embodiment, the balance chamber seal includes a first seal 11, a second seal 12, and an internal connecting member 13 for connecting the first seal 11 and the second seal 12. Among them, the first seal 11 includes a first rigid seal body 111 and a first sealing ring 112 disposed around the outer peripheral surface of the first rigid seal body 111. The second seal 12 includes a second rigid seal body 121 and a second sealing ring 122 disposed around the outer peripheral surface of the second rigid seal body 121. The first rigid seal body 111 and the second rigid seal body 121 are generally cylindrical or frustum-shaped structures, and the first sealing ring 112 and the second sealing ring 122 are parallel to each other. Specifically, a first groove is provided on the outer peripheral surface of the first rigid seal body 111, and the first sealing ring 112 is partially embedded in the first groove. A second groove is provided on the outer peripheral surface of the second rigid seal body 121, and the second sealing ring 122 is partially embedded in the second groove.

[0048] In this embodiment, in order to connect the first seal 11 and the second seal 12, the two ends of the internal connecting member 13 are respectively provided with a first convex portion 13a and a second convex portion 13b. The first rigid seal body 111 and the second rigid seal body 121 are respectively fixedly connected to the first convex portion 13a and the second convex portion 13b. Specifically, the first seal 11 and the second seal 12 are respectively sleeved outside the first convex portion 13a and the second convex portion 13b, and the first seal 11 and the first convex portion 13a, the second seal 12 and the second convex portion 13b are further locked by a locking pin 14 to connect the first rigid seal body 111, the second rigid seal body 121, and the internal connecting member 13 into a whole. At the same time, when the first rigid seal body 111 and the second rigid seal body 121 are respectively installed on the first convex portion 13a and the second convex portion 13b, an isolation is formed between the first rigid seal body 111 and the second rigid seal body 121 through the internal connecting member 13.

[0049] In specific implementation, when the balance cavity seal is installed into the balance cavity, the outer peripheral surfaces of the first rigid seal body 111 and the second rigid seal body 121 are in clearance fit with the inner surface of the balance cavity, while the outer end surfaces of the first sealing ring 112 and the second sealing ring 122 are in interference fit with the inner surface of the balance cavity, so that an inner cavity is formed between the first sealing ring 112 and the second sealing ring 122. This inner cavity is independent of the first cavity 212 and the second cavity 222 and is located between the first cavity 212 and the second cavity 222. The first sealing ring 112 and the second sealing ring 122 then achieve a double sealing effect to further prevent the liquid in the first cavity 212 and the second cavity 222 from flowing through, thereby improving the safety of treatment. In addition, by slidably installing the balance cavity seal into the balance cavity, the balance cavity seal can partition the balance cavity into the first cavity 212 and the second cavity 222. The first cavity 212 and the second cavity 222 are respectively located on both sides of the balance cavity seal. At this time, the first seal 11 has a first sealing end surface 111a facing the first cavity 212, the second seal 12 has a second sealing end surface 121a facing the second cavity 222, and both the first sealing end surface 111a and the second sealing end surface 121a are rigid sealing surfaces. Thus, the balance cavity seal is different from the diaphragm. The first sealing end surface 111a and the second sealing end surface 121a do not produce tensile deformation and are not affected by the inflow and outflow turbulence when the liquid enters and exits the first cavity 212 and the second cavity 222, so the balance accuracy is relatively high. At the same time, when the liquid enters and exits the first cavity 212 and the second cavity 222, the moving speed of the balance cavity seal is low and the wear is small. In addition, the materials of the first rigid seal body 111 and the second rigid seal body 121 have a wide selection range, and materials with strength and toughness much higher than those of the diaphragm can be selected, thereby improving the service life of the balance cavity seal.

[0050] Embodiment 2

[0051] As Figures 3-5 shown, the following is the second embodiment of the present invention. This embodiment provides a balance cavity assembly. An inner part of the balance cavity assembly is provided with a balance cavity seal provided in Embodiment 1. In addition, the balance cavity assembly further includes:

[0052] A main housing 20, a first end cap 21 and a second end cap 22, wherein the main housing 20 is a hollow tubular structure, and the first end cap 21 and the second end cap 22 are respectively detachably mounted to both ends of the main housing 20 through a plurality of threaded connectors 23 to seal both ends of the main housing 20. To make the connection between the first end cap 21 and the second end cap 22 and the main housing 20 airtight and prevent liquid leakage, sealing members are provided at the connection between the first end cap 21 and the main housing 20 and at the connection between the second end cap 22 and the main housing 20. The sealing member can be an elastic sealing ring 24. Thus, the main housing 20, the first end cap 21 and the second end cap 22 cooperate with each other to form a balance chamber. When the balance chamber sealing member is installed into the balance chamber, the outer end faces of the first sealing ring 112 and the second sealing ring 122 of the balance chamber sealing member are in interference fit with the inner surface of the main housing 20, thereby dividing the balance chamber into a first cavity 212 and a second cavity 222.

[0053] In this embodiment, to facilitate the independent inflow and outflow of liquid in the first cavity 212 and the second cavity 222, two groups of first liquid flow holes 211 are provided on the first end cap 21 and are respectively used to achieve the inflow and outflow of the first cavity 212. Two groups of second liquid flow holes 221 are provided on the second end cap 22 and are respectively used to achieve the inflow and outflow of the second cavity 222. In specific implementation, when the first cavity 212 is inflowing, the liquid in the first cavity 212 pushes the entire balance chamber sealing member to move towards the second cavity 222, and the liquid in the second cavity 222 can be extruded outwards, thereby discharging the liquid in the second cavity 222 outwards to achieve the equal-volume input and output of dialysate and waste liquid. In specific implementation, to control the inflow and outflow of the first cavity 212 and the second cavity 222, liquid conveying pipes (not shown in the figure) are provided at the first liquid flow holes 211 and the second liquid flow holes 221, and electromagnetic valves can be provided on the liquid conveying pipes to control the input and output of liquid.

[0054] In this embodiment, to control the displacement of the balance chamber seal in the balance chamber, the balance chamber assembly further includes a physical limit component. The physical limit component includes a first limit block 31 and a second limit member 32. Wherein, one end of the first limit member is fixedly connected to the inner side surface of the first end cover 21, and the other end is provided with a first contact surface 31a that can contact the balance chamber seal. One end of the second limit member 32 is fixedly connected to the inner side surface of the second end cover 22, and the other end is provided with a second contact surface 32a that can contact the balance chamber seal. When the balance chamber seal contacts the first contact surface 31a or the second contact surface 32a, the balance chamber seal stops moving, so that the balance chamber seal can reciprocally slide between the first limit member and the second limit member 32, making the liquid inflow and outflow volumes in the first chamber 212 and the second chamber 222 balanced.

[0055] In specific implementation, liquid enters the first chamber 212, and the liquid in the first chamber 212 pushes the balance chamber seal towards the second chamber 222, and squeezes the liquid in the second chamber 222 to discharge it outward through the second liquid flow hole 221, thereby achieving the balance of the liquid inflow and outflow volumes in the first chamber 212 and the second chamber 222. Vice versa, when liquid enters the second chamber 222, the liquid in the first chamber 212 can also be discharged in equal amounts.

[0056] Embodiment 3

[0057] The following is the third embodiment of the present invention. This embodiment provides a balance chamber assembly. On the basis of the balance chamber assembly provided in Embodiment 2, a power supply component and a controller are further provided. Two poles of the power supply component are respectively connected to the first end cover 21 and the second end cover 22 to form a test circuit. At the same time, a detection unit is also provided on the test circuit. The detection unit is used to detect whether an electrical signal is generated in the test circuit. The output end of the detection unit is further connected to a controller, and the output end of the controller is connected to an alarm.

[0058] Embodiment 4

[0059] The following is the fourth embodiment of the present invention. This embodiment provides a leakage detection method for a balance cavity assembly. The leakage detection method for the balance cavity assembly provided in this embodiment is used to detect possible leakage sites in the balance cavity assembly in Embodiment 3 and can issue a warning signal. Specifically, the occurrence location of the leakage site is the balance cavity seal, and specifically, it can be any one or more of the contact surfaces between the first sealing ring 112 and the first rigid sealing body 111, the contact surface between the first sealing ring 112 and the inner surface of the main housing 20, the contact surface between the second sealing ring 122 and the second rigid sealing body 121, the contact surface between the second sealing ring 122 and the inner surface of the main housing 20, and the leakage of the first sealing ring 112 and the second sealing ring 122 themselves. More specifically, the leakage detection method for the balance cavity assembly specifically includes the following steps:

[0060] S1: Connect the first rigid sealing body 111 and the second rigid sealing body 121 through the internal connecting member 13 to form the balance cavity seal, and then slidably install the balance cavity seal inside the balance cavity so that the balance cavity seal can reciprocate between the first limiting member and the second limiting member 32. Among them, an insulating layer is provided on the outer surface of the internal connecting member 13 or the internal connecting member 13 is made of insulating material as a whole, so as to block the electrical conduction between the first rigid sealing body 111 and the second rigid sealing body 121. Correspondingly, a conductive layer is provided on the outside of the first rigid sealing body 111 and the second rigid sealing body 121 or the first rigid sealing body 111 and the second rigid sealing body 121 are made of conductor material as a whole;

[0061] S2: Connect the first end cover 21 to the positive or negative pole of the power supply assembly, and connect the second end cover 22 correspondingly to the negative or positive pole of the power supply assembly to construct a test circuit. Among them, a conductive layer is provided on the outer surface of the first end cover 21 or the second end cover 22 or the first end cover 21 and the second end cover 22 are made of conductor material as a whole, and an insulating layer is provided on the outer surface of the main housing 20 or the main housing 20 is made of insulating material as a whole to block the electrical conduction between the first end cover 21 and the second end cover 22;

[0062] S3: Inject a conductive liquid into the first cavity 212 and the second cavity 222 respectively through the first liquid flow hole 211 and the second liquid flow hole 221. The conductive liquid is any one of waste liquid, dialysis liquid, water or physiological saline for treating a patient. During this process, the detection unit is used to detect in real time whether there is an electrical signal in the test circuit, so as to judge the sealing state of the first sealing ring 112 and the second sealing ring 122.

[0063] More specifically, when the balance chamber seal is slidably mounted within the main housing 20, an inner chamber independent of the first chamber 212 and the second chamber 222 is formed between the first sealing ring 112 and the second sealing ring 122. When there are no leakage sites in the balance chamber seal, both the first sealing ring 112 and the second sealing ring 122 are in good sealing condition. The conductive liquid in the first chamber 212 and the second chamber 222 cannot enter the inner chamber, and the electrical conduction between the first rigid sealing body 111 and the second rigid sealing body 121 is blocked by the internal connection member 13, forming an open circuit between the first end cap 21 and the second end cap 22. At this time, no electrical signal is generated in the test circuit. When at least one of the first sealing ring 112 and the second sealing ring 122 leaks, the liquid in the first chamber 212 and the second chamber 222 can enter the inner chamber from the leakage point. At this time, the first rigid sealing body 111 and the second rigid sealing body 121 are conducted due to the presence of conductive liquid in the inner chamber. Moreover, since there is also conductive liquid deposited in the first chamber 212 and the second chamber 222, the first end cap 21 and the second end cap 22 are conducted. Therefore, an electrical signal can be generated in the test circuit. When the detection unit detects the generation of an electrical signal, the controller controls the alarm to emit a warning signal to indicate that a leakage has occurred in the balance chamber seal and liquid has invaded the inner cavity. At this time, the sealing body needs to be replaced or repaired. The leakage detection method of the balance chamber assembly can timely detect and give an early warning of the leakage generated by the balance chamber seal during the treatment process, improving the safety of the treatment.

[0064] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention. The technologies, shapes, and structures not described in detail in the present invention are all well-known technologies.

Claims

1. A balance chamber assembly of a hemodialysis device, characterized in that: it includes a balance chamber seal, which is used to be installed in the balance chamber and is used to divide the balance chamber into independent first chamber (212) and second chamber (222). The balance chamber seal includes a first seal (11), and the first seal (11) has a first sealing end face (111a) facing the first chamber (212); a second seal (12), which can be fixed to one side of the first seal (11), and the second seal (12) has a second sealing end face (121a) facing the second chamber (222); When the second seal (12) is fixed to one side of the first seal (11), an inner chamber independent of the first chamber (212) and the second chamber (222) is formed between the first seal (11) and the second seal (12); The first seal (11) includes a first rigid seal body (111) and a first sealing ring (112) arranged around the outer peripheral surface of the first rigid seal body (111). The outer peripheral surface of the first rigid seal body (111) has a clearance fit with the inner surface of the balance chamber. The second seal (12) includes a second rigid seal body (121) and a second sealing ring (122) arranged around the outer peripheral surface of the second rigid seal body (121). The outer peripheral surface of the second rigid seal body (121) has a clearance fit with the inner surface of the balance chamber. The outer end faces of the first sealing ring (112) and the second sealing ring (122) have an interference fit with the inner surface of the balance chamber, and the first sealing ring (112) and the second sealing ring (122) are parallel to each other. The inner chamber is formed between the first sealing ring (112) and the second sealing ring (122). The balance chamber seal further includes an internal connecting member (13), the internal connecting member (13) is arranged in the inner chamber, and both ends of the internal connecting member (13) are respectively provided with a first convex portion (13a) and a second convex portion (13b), and the first rigid seal body (111) and the second rigid seal body (121) are respectively fixedly connected to the first convex portion (13a) and the second convex portion (13b); It further includes a hollow main housing (20). Both ends of the main housing (20) are respectively provided with a first end cover (21) and a second end cover (22). The balance chamber is formed between the main housing (20), the first end cover (21) and the second end cover (22). The balance chamber seal is slidably installed in the balance chamber, and the outer end faces of the first sealing ring (112) and the second sealing ring (122) have an interference fit with the inner surface of the main housing (20).

2. A balance chamber assembly according to claim 1, characterized in that: A first groove is provided on the outer peripheral surface of the first rigid sealing body (111), and a part of the first sealing ring (112) is embedded in the first groove. A second groove is provided on the outer peripheral surface of the second rigid sealing body (121), and a part of the second sealing ring (122) is embedded in the second groove.

3. A balance cavity assembly according to claim 1, characterized in that: at least one first liquid flow hole (211) communicating with the external environment is provided on the first end cover (21), and at least one second liquid flow hole (221) communicating with the external environment is provided on the second end cover (22).

4. A balance cavity assembly according to claim 1, characterized in that: The first end cover (21) and the second end cover (22) are respectively detachably mounted at both ends of the main housing (20), and sealing members are provided at the joints of the first end cover (21) and the main housing (20) and the joints of the second end cover (22) and the main housing (20).

5. A balance cavity assembly according to claim 1, characterized in that: The balance cavity assembly further includes a physical limit component, the physical limit component includes a first limit block (31) and a second limit member (32), the first limit block (31) and the second limit member (32) are respectively arranged at both ends of the balance cavity, and the balance cavity seal can slide between the first limit block (31) and the second limit member (32).

6. A balance cavity assembly according to claim 1, characterized in that: It further includes a power supply component and a controller. Two poles of the power supply component are respectively connected to the first end cover (21) and the second end cover (22) to form a test circuit, and a detection unit is provided on the test circuit, and the detection unit is used to detect whether an electrical signal is generated in the test circuit.

7. A leakage detection method for a balance cavity assembly according to any one of claims 1-6, characterized in that, including: S1: Connect the first rigid sealing body (111) and the second rigid sealing body (121) through an internal connecting member (13) to form the balance cavity seal, and then slidably mount it inside the balance cavity. Among them, the internal connecting member (13) is used to block the electrical conduction between the first rigid sealing body (111) and the second rigid sealing body (121); S2: Connect the first end cover (21) to the positive or negative pole of the power supply component, and connect the second end cover (22) to the negative or positive pole of the power supply component correspondingly to construct a test circuit. Among them, a conductive layer is provided on the outer surface of the first end cover (21) or the second end cover (22), or the first end cover (21) and the second end cover (22) are integrally made of a conductor material; S3: Inject conductive liquid into the first cavity (212) and the second cavity (222) respectively through the first liquid flow hole (211) and the second liquid flow hole (221), and the detection unit detects the electrical signal in the test circuit in real time. When there is an electrical signal in the test circuit, it is determined that at least one of the first sealing ring (112) and the second sealing ring (122) leaks.

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