CN210661381U

CN210661381U - Pneumatic valve and low-temperature freezing treatment equipment

Info

Publication number: CN210661381U
Application number: CN201921536019.2U
Authority: CN
Inventors: 刘翠鹄; 肖剑; 韦文生; 黄乾富
Original assignee: Hygea Medical Technology Co Ltd
Current assignee: Hygea Medical Technology Co Ltd
Priority date: 2019-09-16
Filing date: 2019-09-16
Publication date: 2020-06-02
Anticipated expiration: 2029-09-16

Abstract

The utility model relates to the technical field of fluid mechanical control, in particular to a pneumatic valve and a low-temperature freezing treatment device; the pneumatic valve provided by the utility model is arranged on the low-temperature freezing treatment equipment in the using process, the cylinder plug is made to reciprocate along the axial direction of the cylinder by injecting gas into the cylinder, and the cylinder plug drives the valve core to be far away from or close to the valve body through the transmission part, thereby realizing the switching action of the valve; the pneumatic valve is arranged on the low-temperature freezing treatment equipment, so that the phenomenon that the gas-liquid ratio of cold working medium flowing through a treatment part is increased and the treatment effect is influenced due to continuous heating of the electromagnetic coil in the working process of controlling the liquid nitrogen by the electromagnetic valve can be effectively avoided; meanwhile, the pneumatic valve is adopted, so that the reaction is more timely and the response is fast; the switch valve is more stable and reliable in operation. The utility model also provides a low temperature cryotherapy equipment owing to include foretell pneumatic valve, consequently also possesses foretell beneficial effect.

Description

Pneumatic valve and low-temperature freezing treatment equipment

Technical Field

The utility model relates to a fluid machinery control technical field especially relates to a pneumatic valve and low temperature cryotherapy equipment.

Background

The cryogenic cryoablation technology is becoming the main means of interventional tumor therapy, and the cryogenic cryotherapy equipment using liquid nitrogen as working medium is popular due to the characteristics of low use cost, wide application range and the like. However, the existing low-temperature freezing treatment equipment generally adopts an electromagnetic valve to control liquid nitrogen, and the liquid nitrogen in the pipeline is gasified due to continuous heating of an electromagnetic coil in the working process, namely, the ratio of gas to liquid of cold working medium flowing through a treatment part is increased, so that the treatment effect is influenced; in addition, because the electromagnetic coil is restricted by factors such as current, turns, electromagnetic air gap, iron core sectional area and the like, the electromagnetic force is limited, namely the sealing force of the valve is limited, and the requirement of leakage rate is difficult to meet at low temperature.

SUMMERY OF THE UTILITY MODEL

The utility model provides a pneumatic valve, which is installed in a low-temperature freezing treatment device and can effectively solve the technical problem.

The pneumatic valve provided by the utility model comprises a driving part, an executing part and a transmission part; the driving part comprises a cylinder and a cylinder plug which is connected to the inside of the cylinder in a sliding manner; the driving part is configured to reciprocate the cylinder plug in an axial direction of the cylinder by injecting gas into the cylinder; the executing part comprises a valve body and a valve core, and the valve core is movably connected to the valve body; the two ends of the transmission part are respectively connected with the cylinder plug and the valve core, and the cylinder plug drives the valve core to be far away from or close to the valve body through the transmission part.

In one embodiment, the transmission portion includes a valve neck and a cylinder shaft slidably connected in the valve neck, one end of the cylinder shaft penetrates through the cylinder plug, and the other end of the cylinder shaft is connected with the valve core.

In one embodiment, the transmission portion further comprises a transition shaft detachably connected with the cylinder shaft, the transition shaft being connected between the cylinder shaft and the valve core.

In one embodiment, the transmission part further comprises a first elastic coupling, and two ends of the first elastic coupling are respectively connected with the cylinder shaft and the transition shaft through spring pins.

In one embodiment, the actuator further comprises a valve stem slidably connected within the valve neck, one end of the valve stem being connected to the transition shaft and the other end being connected to the valve cartridge.

In one embodiment, the transmission part further comprises a second elastic coupling, and the valve rod and the transition shaft are connected through the second elastic coupling.

In one embodiment, the transmission part further comprises a shaft sleeve, the shaft sleeve is sleeved on the valve rod, and the outer peripheral wall of the shaft sleeve is movably connected with the inner wall of the valve neck.

In one embodiment, the actuator further comprises a valve core seat, and the valve rod and the valve core are connected through the valve core seat.

In one embodiment, the actuating portion further comprises a bellows, and the bellows is sleeved outside the valve rod.

In one embodiment, the driving part further comprises an elastic member, one end of the elastic member abuts against one end of the cylinder shaft away from the valve core, and the other end abuts against the top wall of the cylinder; when gas is injected into the cylinder, the cylinder plug drives one end of the cylinder, which is close to the elastic part, in the axial direction to slide so as to compress the elastic part, and the elastic part contracts under the extrusion action of the cylinder shaft and accumulates elastic restoring force.

The utility model also provides a low temperature refrigeration treatment equipment, low temperature refrigeration treatment equipment includes foretell pneumatic valve.

The utility model provides a pair of pneumatic valve compares with prior art, possesses following beneficial effect at least:

the pneumatic valve provided by the utility model is arranged on the low-temperature freezing treatment equipment in the using process, the cylinder plug is made to reciprocate along the axial direction of the cylinder by injecting gas into the cylinder, and the cylinder plug drives the valve core to be far away from or close to the valve body through the transmission part, thereby realizing the switching action of the valve; the pneumatic valve is arranged on the low-temperature freezing treatment equipment, so that the phenomenon that the gas-liquid ratio of cold working medium flowing through a treatment part is increased and the treatment effect is influenced due to continuous heating of the electromagnetic coil in the working process of controlling the liquid nitrogen by the electromagnetic valve can be effectively avoided; meanwhile, the pneumatic valve is adopted, so that the reaction is more timely and the response is fast; the switch valve is more stable and reliable in operation.

The utility model provides a low temperature cryotherapy equipment owing to include foretell pneumatic valve, consequently also possesses foretell beneficial effect.

Drawings

The present invention will be described in more detail hereinafter based on embodiments and with reference to the accompanying drawings.

Fig. 1 is a schematic view of an overall configuration of a pneumatic valve of an embodiment of the present invention at a first viewing angle;

fig. 2 is a schematic view of the internal structure of a pneumatic valve according to an embodiment of the present invention;

fig. 3 is a schematic view of the pneumatic valve of an embodiment of the present invention in its overall configuration at a second viewing angle;

fig. 4 is a schematic structural diagram of a first elastic coupling or a second elastic coupling of a pneumatic valve according to an embodiment of the present invention.

In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.

Reference numerals:

10-pneumatic valves; 11-a drive section; 111-cylinder upper cover; 111 a-vent; 111 b-detector mount; 112-set screws; 113-cylinder lower cover; 115-gas inlet end cap; 1151-an air inlet seat; 1152-gas inlet; 114-cylinder plug; 116-a locking nut; 117-an elastic member; 13-an execution section; 131-a valve body; 131 a-an inlet; 131 b-an outlet; 131 c-valve body fixing hole; 132-VCR connector structure; 133-a valve stem; 133 a-a retaining ring; 134-valve seat; 135-a bellows; 136-a compression nut; 137-a gasket; 139-a valve core; 15-a transmission part; 151-valve neck; 1511-heat transfer hole; 152-a cylinder shaft; 153-transition axis; 154-a first resilient coupling; 154 a-stress relief holes; 154 b-fixation holes; 155-spring pins; 156-a second resilient coupling; 157-shaft sleeve; 158-valve neck fixing member; 158 a-inlet cover baffle; 158 b-location pad.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

Referring to fig. 1, an air-operated valve 10 according to the present invention includes a driving portion 11, an actuating portion 13, and a transmission portion 15; the driving part 11 includes a cylinder and a cylinder plug 114 slidably coupled to an inside of the cylinder; the driving portion 11 is configured to reciprocate the cylinder plug 114 in the axial direction of the cylinder by injecting gas into the cylinder; the actuating part 13 comprises a valve body 131 and a valve core 139, wherein the valve core 139 is movably connected with the valve body 131; the two ends of the transmission part 15 are respectively connected with the cylinder plug 114 and the valve core 139, and the cylinder plug 114 drives the valve core 139 to be far away from or close to the valve body 131 through the transmission part 15.

The pneumatic valve 10 provided by the utility model, in the using process, the pneumatic valve 10 is installed on the low temperature cryotherapy equipment, the cylinder plug 114 makes reciprocating motion along the axial direction of the cylinder by injecting gas into the cylinder, the cylinder plug 114 drives the valve core 139 to be far away from or close to the valve body 131 through the transmission part 15, and further the on-off function of the valve is realized; the pneumatic valve 10 is arranged on the low-temperature freezing treatment equipment, so that the phenomenon that the gas-liquid ratio of cold working medium flowing through a treatment part is increased and the treatment effect is influenced due to continuous heating of the electromagnetic coil in the working process of controlling liquid nitrogen by the electromagnetic valve can be effectively avoided; meanwhile, the pneumatic valve 10 is adopted, so that the reaction is more timely and the response is fast; the switch valve is more stable and reliable in operation.

In one embodiment, the transmission portion 15 includes a valve neck 151 and a cylinder shaft 152 slidably connected in the valve neck 151, wherein one end of the cylinder shaft 152 penetrates the cylinder plug 114 and the other end is connected to the valve core 139. In the implementation process, gas is injected into the cylinder so that the cylinder plug 114 drives the cylinder shaft 152 to reciprocate, and then the cylinder shaft 152 drives the valve core 139 to be far away from or close to the valve body 131, thereby realizing the opening and closing of the valve.

Specifically, in this embodiment, the heat exchange hole 1511 is opened on the side wall of the valve neck 151, and the valve rod 133 and the transmission part inside can effectively exchange heat with air, thereby avoiding further transmission of cold energy. Further, a heat exchange hole 1511 is opened at the center of the valve neck 151.

Specifically, in the present embodiment, the cylinder plug 114 is connected with the cylinder shaft 152 by a lock nut 116, preferably, a K-cap lock nut having a self-locking and anti-loose function is adopted, which is particularly important for moving parts.

Specifically, in one embodiment, the transmission portion 15 further includes a transition shaft 153, the transition shaft 153 is detachably connected with the cylinder shaft 152, and the transition shaft 153 is connected between the cylinder shaft 152 and the valve core 139. The transition shaft 153 is detachably connected with the cylinder shaft 152, so that the phenomenon that the cylinder shaft 152 is simply designed to be directly driven to cause easy abrasion and short service life can be effectively avoided.

In one embodiment, the transmission part 15 further includes a first elastic coupling 154, and both ends of the first elastic coupling 154 are respectively connected to the cylinder shaft 152 and the transition shaft 153 by a spring pin 155. Since the first elastic coupling 154 is designed with the buffering gap and the stress releasing hole 154a, the sealing force can be effectively transmitted. Specifically, the first elastic coupling 154 is made of spring steel 65Mn, which has excellent mechanical properties (especially, elastic limit, strength limit, yield ratio), anti-creep properties (i.e., anti-sag properties, also referred to as anti-relaxation properties), fatigue properties, hardenability, and physicochemical properties (heat resistance, low temperature resistance, oxidation resistance, corrosion resistance, etc.). It should be noted that the specific material of the first elastic coupling 154 is not limited herein, and it is understood that in other embodiments, the first elastic coupling 154 may be made of other elastic materials according to the needs of the user.

In one embodiment, the actuator 13 further comprises a stem 133, the stem 133 being slidably coupled within the neck 151, the stem 133 being coupled at one end to the transition shaft 153 and at the other end to the spool 139. Specifically, the transmission part 15 further includes a second elastic coupling 156, and the valve rod 133 and the transition shaft 153 are connected by the second elastic coupling 156. Since the second elastic coupling 156 is designed with the buffer gap and the stress release hole 154a, the sealing force can be effectively transmitted. Specifically, the second elastic coupling 156 is made of spring steel 65Mn, which has excellent mechanical properties (especially, elastic limit, strength limit, yield ratio), anti-creep properties (i.e., anti-sag properties, also referred to as anti-relaxation properties), fatigue properties, hardenability, and physicochemical properties (heat resistance, low temperature resistance, oxidation resistance, corrosion resistance, etc.). It should be noted that the specific material of the second elastic coupling 156 is not limited herein, and it is understood that in other specific embodiments, the second elastic coupling 156 may be made of other elastic materials according to the needs of the user.

In the present embodiment, the first elastic coupling 154 and the second elastic coupling 156 are made of the same structure; has a fixing hole 154b and a stress releasing hole 154 a.

In one embodiment, the transmission portion 15 further includes a shaft sleeve 157, the shaft sleeve 157 is disposed on the valve stem 133, and an outer peripheral wall of the shaft sleeve 157 is movably connected to an inner wall of the valve neck 151. A bushing 157 is provided to improve centering during movement of the valve stem 133. Specifically, in the present embodiment, the material of the bushing 157 is PTFE (poly tetra fluoro ethylene PTFE), which is referred to as PTFE, and has good corrosion resistance, excellent low temperature resistance, self-lubricity, and a very low friction coefficient. Further, in this embodiment, the shaft sleeve 157 and the valve rod 133 are fixed in a limited manner by the retaining ring 133a, so as to further improve the stability of the connection between the shaft sleeve 157 and the valve rod 133.

In one embodiment, the actuator 13 further includes a valve core seat 134, and the valve stem 133 and the valve core 139 are connected by the valve core seat 134. That is, the valve core 139 is embedded in the valve core seat 134, and the connection between the valve core seat 134 and the valve rod 133 adopts the threaded connection, so that the valve core 139 can be conveniently replaced after being worn to a certain degree.

Specifically, in this embodiment, the valve element 139 is made of PTFE or a479 alloy, which is excellent in low-temperature performance and wear resistance; it should be noted that, the specific material of the valve core 139 is not limited herein, and it should be understood that, in other specific embodiments, the valve core 139 may also be made of other elastic materials according to the needs of users.

Specifically, in the present embodiment, the valve body 131 is made of 316 stainless steel, and it should be noted that the 316 stainless steel is an austenitic stainless steel, and the corrosion resistance and the high-temperature strength are greatly improved by adding Mo element, and the high-temperature resistance can reach 1200 and 1300 degrees, and can be used under harsh conditions. Further, a valve body fixing hole 131c is formed in the bottom of the valve body 131, and the valve body 131 is convenient to install and use due to the valve body fixing hole 131 c.

In one embodiment, the actuator 13 further includes a bellows 135, and the bellows 135 is disposed outside the valve stem 133. Specifically, the valve rod 133 has a connection convex ring, the bellows 135 is fixedly connected to the connection convex ring by welding, and the bellows 135 is arranged, so that a gas layer is formed by vaporization on the bellows 135 in the circulation process of liquid nitrogen, thereby effectively isolating the cold energy transmission between the liquid nitrogen and the transmission part 15 and reducing the influence of low temperature on the valve transmission part 15 and the driving part 11.

Specifically, in the present embodiment, the valve body 131 includes an inlet 131a and an outlet 131 b; specifically, in this embodiment, the inlet 131a and the outlet 131b of the valve body 131 are connected to the VCR joint structure 132, which has a vacuum-level sealing effect and can be conveniently connected to the pipeline; it should be noted that, the user can also select the structural style of the ordinary card sleeve according to the needs.

In one embodiment, the valve body 131 and the valve neck 151 are removably coupled by a compression nut 136. It should be noted that, the specific connection manner between the valve body 131 and the valve neck 151 is not limited herein, and it should be understood that, in other specific embodiments, the two may be detachably connected through other connections, such as clamping connection and the like.

Specifically, a gasket 137 is provided on the end surface of the neck 151 connected to the valve body 131. The sealing gasket 137 is arranged to effectively improve the sealing performance of the joint and prevent gas leakage.

In one embodiment, the driving portion 11 further includes an elastic member 117, one end of the elastic member 117 abuts against one end of the cylinder shaft 152 away from the valve core 139, and the other end abuts against the top wall of the cylinder; when gas is injected into the cylinder, the cylinder plug 114 drives the cylinder shaft 152 to slide towards one end close to the elastic member 117 to compress the elastic member 117, and the elastic member 117 contracts under the pressing action of the cylinder shaft 152 and accumulates elastic restoring force. The elastic member 117 is arranged, and when the valve needs to be closed and the gas pressure in the cylinder disappears, the cylinder shaft 152 drives the valve core 139 to move towards one end close to the valve body 131 under the elastic restoring force of the elastic member 117 so as to close the valve.

Specifically, in the present embodiment, the cylinder includes a cylinder upper cover 111, a cylinder lower cover 113, and an air inlet cover 115, and the cylinder upper cover 111, the cylinder lower cover 113, and the air inlet cover 115 are sequentially connected to form a sealed cylinder block; the cylinder upper cover 111 is connected with the cylinder lower cover 113 through a set screw 112, the cylinder upper cover 111 is provided with an exhaust hole 111a, and the exhaust hole 111a is used for releasing gas during cylinder movement, namely valve opening and closing. Specifically, the cylinder top cover 111 is further provided with a detector mounting seat 111b, and a user can configure a detection switch as required to detect the position of the cylinder shaft 152 in the cylinder as confirmation feedback of the valve switch state. Specifically, in this embodiment, a photoelectric detection switch may be adopted, which has the advantages of small size, long service life, high precision, fast response speed, and strong light, electric, and magnetic interference resistance.

Specifically, in this embodiment, the gas inlet end cap 115 and the lower end cap are connected in a nested manner and are designed to be rotatable, and an O-ring is arranged between the gas inlet end cap 115 and the lower end cap to ensure the sealing performance in the rotating process and improve the assembly performance of the product; the gas inlet end cover 115 is provided with a gas inlet seat 1151, and a corresponding gas pipe clamping sleeve connector can be selected as required to facilitate connection with a gas source pipeline. The intake port holder 1151 includes an intake port 1152, and the intake port 1152 communicates with the inside of the cylinder.

Specifically, in this embodiment, two O-ring seals are disposed between the gas inlet cover 115 and the lower end cover, and it should be noted that the specific number of the O-ring seals is not limited herein, and it can be understood that, in other specific embodiments, the specific number of the O-ring seals may also be set to be three or four according to the requirement of the user.

Specifically, in the present embodiment, a valve neck fixing member 158 is disposed between the cylinder lower cover 113 and the valve neck 151, the valve neck fixing member 158 is in threaded connection with the cylinder lower cover 113 and the valve neck 151, and a positioning block is designed between the valve neck 151 and the valve neck fixing member 158, so as to ensure consistency during assembly.

In this embodiment, the cylinder shaft 152, the inner ring of the cylinder plug 114, the inner ring of the valve neck fixing member 158, and O-ring seals are designed between the outer ring of the cylinder plug 114 and the inner ring of the cylinder, and the O-ring seals on the outer ring of the cylinder plug 114 are coated with grease to ensure the sealing performance and reliability of the cylinder plug 114 during the movement process.

Specifically, in the present embodiment, an air inlet cover baffle 158a is further disposed at the connection of the valve neck fixing member 158 and the cylinder; a positioning pad 158b is disposed at the joint of the neck fixing member 158 and the neck 151.

The utility model also provides a low temperature cryotherapy equipment, its characterized in that, low temperature cryotherapy equipment includes foretell pneumatic valve 10.

The utility model also provides a cryotherapy equipment owing to include foretell pneumatic valve 10, consequently also possesses foretell beneficial effect.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present invention is not limited to the particular embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. A pneumatic valve, characterized in that the pneumatic valve (10) comprises:

a drive unit (11), wherein the drive unit (11) comprises a cylinder and a cylinder plug (114) slidably connected to the inside of the cylinder; the driving part (11) is configured to reciprocate the cylinder plug (114) in an axial direction of the cylinder by injecting gas into the cylinder;

the actuating part (13), the actuating part (13) includes valve block (131) and valve core (139), the said valve core (139) can link to the said valve block (131) movably;

the two ends of the transmission part (15) are respectively connected with the cylinder plug (114) and the valve core (139), and the cylinder plug (114) drives the valve core (139) to be far away from or close to the valve body (131) through the transmission part (15).

2. A pneumatic valve according to claim 1, wherein said transmission portion (15) comprises a valve neck (151) and a cylinder shaft (152) slidably connected in said valve neck (151), said cylinder shaft (152) having one end extending through said cylinder plug (114) and the other end connected to said valve spool (139).

3. A pneumatic valve according to claim 2, wherein the transmission portion (15) further comprises a transition shaft (153), the transition shaft (153) being detachably connected with the cylinder shaft (152), the transition shaft (153) being connected between the cylinder shaft (152) and the spool (139).

4. A pneumatic valve according to claim 3, characterised in that the transmission portion (15) further comprises a first elastic coupling (154), the two ends of the first elastic coupling (154) being connected to the cylinder shaft (152) and to the transition shaft (153) by means of a spring pin (155), respectively.

5. A pneumatic valve according to any one of claims 3 or 4, wherein the actuator (13) further comprises a stem (133), the stem (133) being slidably connected within the neck (151), the stem (133) being connected at one end to the transition shaft (153) and at the other end to the spool (139).

6. A pneumatic valve according to claim 5, wherein the transmission portion (15) further comprises a second elastic coupling (156), the stem (133) being connected to the transition shaft (153) by means of the second elastic coupling (156).

7. The pneumatic valve according to claim 5, wherein the transmission portion (15) further includes a bushing (157), the bushing (157) is sleeved on the valve stem (133), and an outer peripheral wall of the bushing (157) is movably connected with an inner wall of the valve neck (151).

8. The pneumatic valve according to claim 5, wherein the actuator (13) further includes a valve seat (134), the stem (133) and the valve spool (139) being connected by the valve seat (134).

9. A pneumatic valve as claimed in claim 5, characterised in that said actuating portion (13) further comprises a bellows (135), said bellows (135) being housed outside said stem (133).

10. A pneumatic valve according to claim 2, wherein said driving portion (11) further comprises an elastic member (117), one end of said elastic member (117) abuts against one end of said cylinder shaft (152) away from said spool (139), and the other end abuts against said cylinder top wall; when gas is injected into the cylinder, the cylinder plug (114) drives the cylinder shaft (152) to slide towards one end close to the elastic element (117) so as to compress the elastic element (117), and the elastic element (117) contracts under the extrusion action of the cylinder shaft (152) and accumulates elastic restoring force.

11. A cryotherapeutic device comprising a pneumatic valve according to any of claims 1 to 10.