Anaesthesia machine and veterinary anaesthesia machine

Abstract

The anesthesia machine comprises a driving gas branch, a fresh gas branch and a breathing loop, the fresh gas branch is used for feeding fresh gas with anesthetic gas into the breathing loop, and the driving gas branch is used for pushing the fresh gas in the breathing loop to a patient. The driving gas branch comprises a fan assembly, the fan assembly comprises a machine shell, a fan and a first heat dissipation piece, the machine shell comprises a first inner cavity, a first air inlet communicated with the first inner cavity and a first air outlet communicated with the first inner cavity, and the fan is arranged in the first inner cavity and used for driving air to enter the first inner cavity from the first air inlet and be blown out from the first air outlet; the fan comprises a volute, an impeller and a motor, the impeller is rotatably installed in the volute, the motor is installed in the volute and connected with the impeller, the surface, opposite to the first air inlet, of the motor is a projection plane, and the orthographic projection of the first air inlet and the surface of the motor are at least partially overlapped.

Description

Technical Field

[0001] The present application relates to the field of medical devices, and in particular to anesthesia machines and veterinary anesthesia machines. Background Art

[0002] The fan assembly of the existing anesthesia machine uses a radiator or a heat pipe to conduct the heat generated by the motor when it is running to the outside, and the heat is forced to be dissipated through a cooling fan. The heat dissipation structure is complex and costly. Summary of the invention

[0003] In view of this, the present application proposes an anesthesia machine and a veterinary anesthesia machine.

[0004] A first aspect of the present application provides an anesthesia machine, comprising a driving gas branch, a fresh gas branch and a breathing circuit, wherein the fresh gas branch is used to deliver fresh gas with anesthetic gas into the breathing circuit, and the driving gas branch is used to push the fresh gas in the breathing circuit to the patient, and the driving gas branch comprises a fan assembly, and the fan assembly comprises a housing, a fan and a first heat sink, and the housing comprises a first inner cavity, a first air inlet connected to the first inner cavity, and a first air outlet connected to the first inner cavity, and the fan is arranged in the first inner cavity, and the fan is used to drive air from the first air inlet into the first inner cavity and blow out from the first air outlet, and the fan comprises:

[0005] snail shell;

[0006] An impeller rotatably mounted in the volute;

[0007] A motor, mounted on the volute and connected to the impeller, for driving the impeller to rotate;

[0008] Wherein, the first heat sink is installed on the motor and connected to the housing, and the first heat sink is used to conduct the heat generated by the motor to the housing.

[0009] A second aspect of the present application provides an anesthesia machine, comprising a driving gas branch, a fresh gas branch and a breathing circuit, wherein the fresh gas branch is used to deliver fresh gas with anesthetic gas into the breathing circuit, and the driving gas branch is used to push the fresh gas in the breathing circuit to the patient, the driving gas branch comprises a fan assembly, the fan assembly comprises a housing and a fan, the housing comprises a first inner cavity, a first air inlet connected to the first inner cavity, and a first air outlet connected to the first inner cavity, the fan is arranged in the first inner cavity, the fan is used to drive air from the first air inlet into the first inner cavity and blow out from the first air outlet, and the fan comprises:

[0010] snail shell;

[0011] An impeller rotatably mounted in the volute;

[0012] A motor, mounted on the volute and connected to the impeller, for driving the impeller to rotate;

[0013] The first air inlet is opposite to the motor, so that most of the gas entering the first inner cavity from the first air inlet can flow through the surface of the motor to carry away the heat generated when the motor is running.

[0014] The third aspect of the present application provides a veterinary anesthesia machine, comprising a driving gas branch, a fresh gas branch and a breathing circuit, wherein the fresh gas branch is used to deliver fresh gas with anesthetic gas into the breathing circuit, and the driving gas branch is used to push the fresh gas in the breathing circuit to a target object, the driving gas branch comprises a fan assembly, the fan assembly comprises a housing and a fan, the housing comprises a first inner cavity, a first air inlet connected to the first inner cavity, and a first air outlet connected to the first inner cavity, the fan is arranged in the first inner cavity, the fan is used to drive air from the first air inlet into the first inner cavity and blow out from the first air outlet, and the fan comprises:

[0015] snail shell;

[0016] An impeller rotatably mounted in the volute;

[0017] A motor, mounted on the volute and connected to the impeller, for driving the impeller to rotate;

[0018] The first air inlet is opposite to the motor, so that most of the gas entering the first inner cavity from the first air inlet can flow through the surface of the motor to carry away the heat generated when the motor is running.

[0019] It can be seen from the above technical solution that the anesthesia machine proposed in the first aspect of the present application, by providing a first heat sink, conducts the heat generated by the motor to the casing and dissipates it from the casing, thereby achieving a heat dissipation effect on the motor. The heat dissipation structure is simple and low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained like these drawings without paying any creative work.

[0021] Figure 1 It is a block diagram of the local structure of the anesthesia machine proposed in the embodiment of the present application;

[0022] Figure 2 It is a connection diagram of a driving gas branch, a fresh gas branch and a breathing circuit of an anesthesia machine proposed in an embodiment of the present application;

[0023] Figure 3 is a schematic structural diagram of a fan assembly proposed in an embodiment of the present application;

[0024] Figure 4 is an exploded schematic diagram of a fan assembly from a first perspective according to an embodiment of the present application;

[0025] Figure 5 is an exploded schematic diagram of a second viewing angle of a fan assembly provided in an embodiment of the present application;

[0026] Figure 6 is a schematic structural diagram of a first heat sink proposed in an embodiment of the present application;

[0027] Figure 7 is a schematic structural diagram of a first elastic support member proposed in an embodiment of the present application;

[0028] Figure 8 It is a schematic diagram of the structure of the second elastic support member proposed in an embodiment of the present application. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] It should also be understood that the terms used in this application specification are only for the purpose of describing specific embodiments and are not intended to limit the application. As used in this application specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0031] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0032] like Figures 1 to 5As shown, an embodiment of the present application provides an anesthesia machine, including a driving gas branch 100, a fresh gas branch 200 and a breathing circuit 300, wherein the fresh gas branch 200 is used to deliver fresh gas with anesthetic gas into the breathing circuit 300, the driving gas branch 100 is used to push the fresh gas in the breathing circuit 300 to the patient, the driving gas branch 100 includes a fan assembly 10, the fan assembly 10 includes a housing 11 and a fan 12, the housing 11 includes a first inner cavity 111, a first air inlet 112 connected to the first inner cavity 111 and a first air outlet 112 connected to the first inner cavity 111 3. The fan 12 is arranged in the first inner cavity 111. The fan 12 is used to drive air to enter the first inner cavity 111 from the first air inlet 112 and blow out from the first air outlet 113. The fan 12 includes a volute 121, an impeller (not shown) and a motor 123. The impeller is rotatably installed in the volute 121. The motor 123 is installed in the volute 121 and connected to the impeller to drive the impeller to rotate. The first air inlet 112 is close to the motor 123, so that most of the air entering the first inner cavity 111 from the first air inlet 112 can flow through the surface of the motor 123 to carry away the heat generated when the motor 123 is running.

[0033] Optionally, the first air inlet 112 is opposite to the motor 123. The relative includes not only that the first air inlet 112 and the motor 123 are directly opposite in the air inlet direction of the first air inlet 112, but also that the first air inlet 112 and the motor 123 partially overlap in the air inlet direction of the first air inlet 112. As long as the airflow entering the first inner cavity 111 from the first air inlet 112 can blow to the motor 123, it will be sufficient.

[0034] For example, Figure 2The diagram shows the connection relationship between the driving gas branch 100, the fresh gas branch 200 and the breathing circuit 300 in one embodiment. The breathing circuit 300 includes a machine-controlled driving component 301, a main pipeline 302, an inhalation check valve 303, a gas supply pipeline 304, an exhalation check valve 305, a return pipeline 306 and a carbon dioxide absorption tank 307. The gas supply pipeline 304 is connected to one end of the main pipeline 302, and the inhalation check valve 303 and the carbon dioxide absorption tank 307 are installed on the gas supply pipeline 304. The return pipeline 306 connects the gas supply pipeline 304 and the main pipeline 302, and the exhalation check valve 305 is installed on the return pipeline 306. The machine-controlled driving component 301 includes a bellows 3011 and a folded airbag 3012, and the folded airbag 3012 is connected to the other end of the main pipeline 302. The driving gas branch 100 is connected to the cavity enclosed by the bellows 3011 and the folded airbag 3012. The fresh gas branch 200 is connected between the inhalation check valve 303 and the carbon dioxide absorption tank 307. During operation, the gas exhaled by the patient enters the folded airbag 3012 through the exhalation check valve 305 and the main pipeline 302, and the driving gas branch 100 provides driving gas to enter the cavity formed by the bellows 3011 and the folded airbag 3012. The driving gas compresses the folded airbag 3012, thereby transporting the patient's exhaled gas to the carbon dioxide absorption tank 307 through the main pipeline 302. The carbon dioxide absorption tank 307 absorbs the carbon dioxide in the exhaled gas, and the gas coming out of the carbon dioxide absorption tank 307 is mixed with the fresh gas supplied by the fresh gas branch 200 and transported to the patient through the gas supply pipeline 304.

[0035] The anesthesia machine proposed in this embodiment sets the first air inlet 112 opposite to the motor 123. The airflow entering the first inner cavity 111 from the first air inlet 112 and blowing toward the motor 123 can carry away the heat generated by the operation of the motor 123, thereby having a heat dissipation effect on the motor 123. This implementation method cleverly utilizes the structural design of the fan assembly 10 itself, and the heat dissipation structure is simple and low-cost.

[0036] Optionally, the volute 121 includes a second inner cavity 1211, a second air inlet 1212 connected to the second inner cavity 1211, and a second air outlet 1213 connected to the second inner cavity 1211, the impeller is arranged in the second inner cavity 1211, the second air outlet 1213 is connected to the first air outlet 113, wherein the second air inlet 1212 is arranged with its back to the first air inlet 112.

[0037] By setting the second air inlet 1212 to face away from the first air inlet 112, the air entering the first inner cavity 111 from the first air inlet 112 will pass through the outer wall of the volute 121 after passing through the motor 123 and before entering the second air inlet 1212, thereby carrying away the heat transferred from the motor 123 to the volute 121, further achieving a heat dissipation effect on the motor 123. Of course, the second air inlet 1212 is not limited to being set on the side facing away from the first air inlet 112, and can be set at other positions of the volute 121, depending on actual design requirements.

[0038] like Figure 4 and Figure 6 As shown, optionally, the fan assembly 10 further includes a first heat sink 13 mounted on the motor 123. The first heat sink 13 can accelerate the heat dissipation of the motor 123, and has a simple structure and low cost.

[0039] Optionally, the first heat sink 13 includes a connection portion 131 and a heat sink 132, wherein the connection portion 131 is connected to the motor 123, and the heat sink 132 is connected to the connection portion 131, so as to increase the heat dissipation area. Of course, the first heat sink 13 may not be provided with the heat sink 132.

[0040] Optionally, the connection portion 131 and the heat sink 132 are integrally formed, for example, integrally formed by casting.

[0041] Optionally, the first heat sink 13 is made of a copper-based or aluminum-based metal material. The copper-based or aluminum-based metal material has good thermal conductivity, can form a good heat dissipation effect for the motor 123, and has low cost.

[0042] Optionally, the connecting portion 131 is annular, and the connecting portion 131 is sleeved on the motor 123 . There are multiple heat sinks 132 , and the multiple heat sinks 132 are spaced apart around the outer wall of the connecting portion 131 .

[0043] By setting the connection part 131 to be sleeved on the motor 123, the motor 123 can be evenly cooled and the cooling effect is good. Of course, the connection part 131 is not limited to being set in a ring shape, and can also be set in other shapes, as long as the connection part 131 connects the motor 123 and the heat sink 132 to achieve the cooling effect on the motor 123.

[0044] Optionally, at least one heat sink 132 includes a fixed portion 1321 and two sub-heat sinks 1322, one end of the fixed portion 1321 is connected to the connecting portion 131, and the other end of the fixed portion 1321 is connected to the two sub-heat sinks 1322. This embodiment can further expand the heat dissipation area and accelerate the heat dissipation of the motor 123.

[0045] Optionally, the fan assembly 10 further includes a second heat sink 14 , which is disposed between the first heat sink 13 and the housing 11 , and is used to transfer heat from the first heat sink 13 to the housing 11 and diffuse the heat through the housing 11 .

[0046] Optionally, the second heat sink 14 may be a flexible material, such as one of thermal paste, thermal glue, thermal pad and liquid metal. Preferably, the second heat sink 14 is a second heat sink 14 made of a flexible material, for example, the second heat sink 14 is a flexible thermal pad, and the flexible thermal pad can weaken the vibration of the motor 123 transmitted to the housing 11 through the first heat sink 13, thereby reducing the generation of noise. Furthermore, the first heat sink 13 may also be a flexible material, which can effectively prevent the vibration of the motor 123 from being transmitted to the housing 11.

[0047] Optionally, the housing 11 is made of metal material. Metal material has good thermal conductivity, and can quickly conduct the heat generated by the motor 123 to the housing 11 and diffuse it through the housing 11. Available metal materials include copper-based or aluminum-based metal materials. Of course, the housing 11 is not limited to being made of metal materials. For example, the housing 11 can also be made of thermally conductive plastics. Available thermally conductive plastics include PP (polypropylene), ABS (AcrylonitrileButadieneStyrene plastic), PC (Polycarbonate), PA (Nylon Polyamide), LCP (Liquid Crystal Polymer), PPS (Phenylenesulfide), PEEK (Peek materials).

[0048] It should be noted that the entire housing 11 does not necessarily need to be made of metal material or thermally conductive plastic. In some embodiments, only a portion of the first heat sink 13 is in contact with the housing 11 through the second heat sink 14. In this embodiment, it is also possible to configure the housing 11 so that only the side wall in contact with the second heat sink 14 is made of metal material or thermally conductive plastic.

[0049] Optionally, the heat sink 132 includes a first end 1323 and a second end 1324, the first end 1323 is connected to the connecting portion 131, the second end 1324 of at least part of the heat sink 132 is provided with a contact portion 1325 arranged at an angle to the heat sink 132, multiple contact portions 1325 are arranged in the same plane, or multiple contact portions 1325 are connected to form a contact plate, and the second heat sink 14 is clamped between the contact portion 1325 and the casing 11.

[0050] By setting the contact portion 1325 and setting multiple contact portions 1325 on the same plane or connecting them into a contact plate, the connection between the heat sink 132 and the housing 11 is facilitated. At the same time, the contact area between the heat sink 132 and the housing 11 can be expanded, and the heat sink 132 can transfer heat to the housing 11 faster.

[0051] like Figures 4 to 5 , Figures 7 to 8 As shown, optionally, the fan assembly 10 further includes a first elastic support member 15 and a second elastic support member 16, the housing 11 includes a top plate 114 and a bottom plate 115 opposite to the top plate 114, the first elastic support member 15 is sandwiched between the top plate 114 and the top of the fan 123, and the second elastic support member 16 is sandwiched between the bottom plate 115 and the bottom of the fan 123. The first elastic support member 15 and the second elastic support member 16 can play a role in shock absorption, preventing the vibration of the fan 123 during operation from being directly transmitted to the housing 11 to cause noise.

[0052] Optionally, the first elastic support member 15 and the second elastic support member 16 are made of silicone material.

[0053] Optionally, the top plate 114 of the casing 11 is provided with a mounting portion 116 protruding toward the first inner cavity 111, and the first elastic support member 15 is provided with a mounting groove 151 matching the shape of the mounting portion 116. The first elastic support member 15 is installed on the top plate 114 by embedding the mounting portion 116 in the mounting groove 151, and the top of the fan 123 abuts against the first elastic support member 15.

[0054] Exemplarily, there are four mounting portions 116 , which are evenly spaced around the circumference. The first elastic support member 15 includes a main body 152 and four petals 153 evenly spaced around the main body 152 . Each petal 153 is provided with a mounting groove 151 , and the four mounting portions 116 are respectively embedded in the four petals 153 .

[0055] Optionally, the second elastic support member 16 is arranged around the second air inlet 1212, and the side wall of the second elastic support member 16 is provided with a notch 161 connected to the second air inlet 1212. The gas enters the second air inlet 1212 through the notch 161, and enters the second inner cavity 1211 from the second air inlet 1212. In some other implementations, the side wall of the second elastic support member 16 may not be provided with the notch 161, for example, the second elastic support member 16 may be arranged to be spaced from the bottom plate 115, and the gas enters the second air inlet 1212 from the side of the second elastic support member 16 toward the bottom plate 115.

[0056] Optionally, the bottom plate 115 of the housing 11 is provided with a mounting column 117, the bottom of the second elastic support member 16 is provided with a mounting hole 162, the second elastic support member 16 is mounted on the bottom plate 115 by embedding the mounting column 117 in the mounting hole 162, and the bottom of the fan 123 abuts against the second elastic support member 16. Exemplarily, the number of the mounting columns 117 is three, the number of the mounting holes 162 is three, and the three mounting columns 117 are respectively embedded in the three mounting holes 162.

[0057] Optionally, the inner side wall of the second elastic support member 16 is provided with a plurality of spaced ridges 163, and the bottom of the fan 123 abuts against the ridges 163. The ridges 163 can reduce the contact area between the fan 123 and the second elastic support member 16, thereby reducing the vibration of the fan 123 transmitted to the bottom plate 115 through the second elastic support member 16.

[0058] Optionally, the anesthesia machine also includes a fan (not shown) disposed outside the casing 11 , and the fan is used to generate an airflow blowing toward the casing 11 . The airflow can carry away the heat of the casing 11 , accelerate the heat dissipation of the casing 11 , and thereby accelerate the heat dissipation of the motor 123 .

[0059] like Figures 3 to 5 As shown, optionally, the housing 11 further includes a third inner cavity 118 and a third air inlet 119 connected to the third inner cavity 118, and the third inner cavity 118 is connected to the first inner cavity 111 through the first air inlet 112. The fan assembly 10 further includes a first noise reduction assembly 17 disposed in the third inner cavity 118, and the first noise reduction assembly 17 is used to reduce the fan noise discharged from the third air inlet 119.

[0060] By disposing the first noise reduction component 17 in the third inner cavity 118 to reduce the fan noise discharged from the third air inlet 119, the impact of the noise on the patient can be effectively reduced.

[0061] Optionally, the first noise reduction component 17 is provided with a noise reduction channel 171, one end of the noise reduction channel 171 is connected to the first air inlet 112, and the other end of the noise reduction channel 171 is connected to the third air inlet 119. On the one hand, the noise reduction channel 171 is used to connect the first air inlet 112 and the third air inlet 119, so that the air outside the fan component 10 can enter the first inner cavity 111 through the third air inlet 119, the noise reduction channel 171 and the first air inlet 112. On the other hand, the noise reduction channel 171 is used to reduce the noise generated by the fan 123 when it is running and spread out from the third air inlet 119.

[0062] Optionally, the noise reduction channel 171 is in a spiral shape. After the noise is circling for many times in the spiral noise reduction channel 171, it can be better absorbed by the first noise reduction component 17, so that the noise can be better weakened. Of course, the noise reduction channel 171 is not limited to being set in a spiral shape. For example, the noise reduction channel 171 can also be set in a snake shape, an L shape, a straight line shape, or a honeycomb shape, depending on the actual design needs.

[0063] Optionally, the first noise reduction component 17 includes an upper clamping plate 172, a lower clamping plate 173, and a spiral structure 174 sandwiched between the upper clamping plate 172 and the lower clamping plate 173. The upper clamping plate 172, the lower clamping plate 173, and the spiral structure 174 enclose a noise reduction channel 171, and the lower clamping plate 173 is provided with an opening 1731 connecting the noise reduction channel 171 and the first air inlet 112. The first noise reduction component 17 formed by the upper clamping plate 172, the lower clamping plate 173, and the spiral structure 174 is easy to manufacture and assemble.

[0064] Optionally, the first noise reduction component 17 is a first noise reduction component made of a porous foam material. Exemplarily, the porous foam material may be a sound-absorbing sponge, which has good sound absorption effect and low cost.

[0065] Optionally, one of the first noise reduction component 17 and the top plate 114 is provided with an anti-fool hole 1732, and the other of the first noise reduction component 17 and the top plate 114 is provided with an anti-fool column (not shown), which is passed through the anti-fool hole 1732. The coordination of the anti-fool column and the anti-fool hole 1732 facilitates the assembly of the first noise reduction component 17, and can effectively prevent the first noise reduction component 17 from blocking the first air inlet 112 and the third air inlet 119 due to incorrect installation of the first noise reduction component 17.

[0066] Optionally, the housing 11 further includes a fourth inner cavity 11 a and a third air outlet 11 b communicating with the fourth inner cavity 11 a , and the fourth inner cavity 11 a communicates with the first inner cavity 111 through the first air outlet 113 .

[0067] Optionally, a second noise reduction component is provided in the fourth inner cavity 11a, and the second noise reduction component is used to reduce the fan noise discharged from the third air outlet 11b. The setting method of the second noise reduction component can refer to the first noise reduction component 17, which is not repeated here.

[0068] Optionally, a noise reduction sponge is provided on the inner wall of the first inner cavity 111 , and the noise reduction sponge is provided to further reduce the noise of the operation of the fan 123 .

[0069] like Figures 1 to 5As shown, the embodiment of the present application also proposes a veterinary anesthesia machine, including a driving gas branch 100, a fresh gas branch 200 and a breathing circuit 300, wherein the fresh gas branch 200 is used to deliver fresh gas with anesthetic gas into the breathing circuit 300, the driving gas branch 100 is used to push the fresh gas in the breathing circuit 300 to the patient, the driving gas branch 100 includes a fan assembly 10, the fan assembly 10 includes a housing 11, a fan 12 and a first heat sink 13, the housing 11 includes a first inner cavity 111, a first air inlet 112 connected to the first inner cavity 111 and a first heat sink 13 connected to the first inner cavity 111. The first air outlet 113 of the first inner cavity 111, the fan 12 is arranged in the first inner cavity 111, the fan 12 is used to drive the air to enter the first inner cavity 111 from the first air inlet 112 and blow out from the first air outlet 113, the fan 12 includes a volute 121, an impeller (not shown) and a motor 123, the impeller is rotatably installed in the volute 121, the motor 123 is installed in the volute 121 and connected to the impeller, and is used to drive the impeller to rotate, wherein the first heat sink 13 is installed on the motor 123 and connected to the casing 11, the first heat sink 13 is used to conduct the heat generated by the motor 123 to the casing 11.

[0070] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An anesthesia machine, characterized in that: The invention comprises a driving gas branch, a fresh gas branch and a breathing circuit, wherein the fresh gas branch is used to deliver fresh gas with anesthetic gas into the breathing circuit, the driving gas branch is used to push the fresh gas in the breathing circuit to the patient, the driving gas branch comprises a fan assembly, the fan assembly comprises a housing and a fan, the housing comprises a first inner cavity, a first air inlet connected to the first inner cavity and a first air outlet connected to the first inner cavity, the fan is arranged in the first inner cavity, the fan is used to drive air from the first air inlet into the first inner cavity and blow it out from the first air outlet, and the fan comprises: snail shell; An impeller rotatably mounted in the volute; A motor, mounted on the volute and connected to the impeller, for driving the impeller to rotate; Among them, the surface of the motor opposite to the first air inlet is a projection surface, and the orthographic projection of the first air inlet at least partially overlaps with the surface of the motor, so that most of the gas entering the first inner cavity from the first air inlet can flow through the motor surface to carry away the heat generated when the motor is running.

2. An anesthesia machine, characterized in that: The invention comprises a driving gas branch, a fresh gas branch and a breathing circuit, wherein the fresh gas branch is used to deliver fresh gas with anesthetic gas into the breathing circuit, the driving gas branch is used to push the fresh gas in the breathing circuit to the patient, the driving gas branch comprises a fan assembly, the fan assembly comprises a housing and a fan, the housing comprises a first inner cavity, a first air inlet connected to the first inner cavity and a first air outlet connected to the first inner cavity, the fan is arranged in the first inner cavity, the fan is used to drive air from the first air inlet into the first inner cavity and blow it out from the first air outlet, and the fan comprises: snail shell; An impeller rotatably mounted in the volute; A motor, mounted on the volute and connected to the impeller, for driving the impeller to rotate; The first air inlet is opposite to the motor, so that most of the gas entering the first inner cavity from the first air inlet can flow through the surface of the motor to carry away the heat generated when the motor is running.

3. The anesthesia machine according to claim 1 or 2, characterized in that: The fan assembly also includes a first heat sink, which is mounted on the motor and connected to the housing, and is used to conduct heat generated by the motor to the housing.

4. The anesthesia machine according to claim 3, characterized in that: The first heat dissipation element comprises: A connecting portion connected to the motor; A heat sink is connected to the connecting portion and is used to increase the heat dissipation area.

5. The anesthesia machine according to claim 4, characterized in that: The connecting portion is annular and sleeved on the motor. There are a plurality of heat sinks, which are spaced apart around the outer wall of the connecting portion.

6. The anesthesia machine according to claim 5, characterized in that: The fan assembly further includes a second heat sink, which is disposed between the first heat sink and the housing, and is used to direct the heat of the first heat sink to the housing.

7. The anesthesia machine according to claim 6, characterized in that: The heat sink includes a first end and a second end, the first end is connected to the connecting portion, and the second end of at least part of the heat sink is provided with a contact portion arranged at an angle to the heat sink, multiple contact portions are arranged in the same plane, or multiple contact portions are connected to form a contact plate, and the second heat sink is clamped between the contact portion and the casing.

8. The anesthesia machine according to claim 1 or 2, characterized in that: The volute includes a second inner cavity, a second air inlet connected to the second inner cavity, and a second air outlet connected to the second inner cavity, the impeller is arranged in the second inner cavity, the second air outlet is connected to the first air outlet, and the second air inlet is arranged close to the first air inlet.

9. The anesthesia machine according to claim 8, characterized in that: The fan assembly also includes a first elastic support member and a second elastic support member, the casing includes a top plate and a bottom plate opposite to the top plate, the first elastic support member is clamped between the top plate and the top of the fan, and the second elastic support member is clamped between the bottom plate and the bottom of the fan.

10. The anesthesia machine according to claim 9, characterized in that: The second elastic support member is arranged around the second air inlet, and a side wall of the second elastic support member is provided with a notch communicating with the second air inlet.

11. A veterinary anesthesia machine, characterized in that: The invention comprises a driving gas branch, a fresh gas branch and a breathing circuit, wherein the fresh gas branch is used to deliver fresh gas with anesthetic gas into the breathing circuit, the driving gas branch is used to push the fresh gas in the breathing circuit to the target object, the driving gas branch comprises a fan assembly, the fan assembly comprises a housing and a fan, the housing comprises a first inner cavity, a first air inlet connected to the first inner cavity and a first air outlet connected to the first inner cavity, the fan is arranged in the first inner cavity, the fan is used to drive air from the first air inlet into the first inner cavity and blow out from the first air outlet, the fan comprises: snail shell; An impeller rotatably mounted in the volute; A motor, mounted on the volute and connected to the impeller, for driving the impeller to rotate; The first air inlet is opposite to the motor, so that most of the gas entering the first inner cavity from the first air inlet can flow through the surface of the motor to carry away the heat generated when the motor is running.

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