A screw compressor expansion valve with convenient valve seat replacement

Abstract

The present invention relates to a screw machine expansion valve that facilitates valve seat replacement, which defines a first flow section, a second flow section and a connection port that interconnects the first flow section and the second flow section, an actuating mechanism includes a stepping motor and a driving shaft connected to the stepping motor, a valve mechanism includes a discharge piston connected to the driving shaft, a first sealing sleeve is provided on the valve body, the valve mechanism also includes a second sealing sleeve embedded in the first sealing sleeve, a sleeve is provided in the second sealing sleeve and located on the outer periphery of the discharge piston, and the discharge piston is provided with a head in the valve body, and the movement of the head at the connection port realizes the opening and closing of the connection port. By arranging the sleeve in the valve mechanism, the size of the valve seat and the actuating mechanism are freely combined, and valve seats of different sizes can be adapted to the same valve mechanism, which reduces the cost of product development on the one hand, and on the other hand, when the valve seat is damaged, the valve seat can be directly replaced without adapting the corresponding valve mechanism.

Description

Technical Field

[0001] The invention relates to the technical field of expansion valves, in particular to a screw machine expansion valve with convenient valve seat replacement. Background Art

[0002] The electronic expansion valve is a throttling element that can control the flow of refrigerant entering the refrigeration unit according to a preset program. In some occasions where the load changes dramatically or the operating conditions are wide, traditional throttling elements (such as capillary tubes, thermal expansion valves, etc.) can no longer meet the requirements of comfort and energy saving. The electronic expansion valve combined with the compressor variable capacity technology has been more and more widely used. As a new type of control element, the electronic expansion valve has become an important part of the intelligent refrigeration system, and it is also an important means and guarantee for the optimization of the refrigeration system to be truly realized. It is used in more and more fields. The application of electronic expansion valves will become more mature with the advancement and development of technology.

[0003] However, when the screw expansion valve in the prior art is in use, the valve seat and the valve actuator are matched one by one. When the valve seat is broken, the corresponding valve actuator needs to be replaced, resulting in high maintenance costs. Therefore, it is urgent to develop a screw expansion valve that is easy to replace the valve seat to solve the problems in the prior art. Summary of the invention

[0004] The object of the present invention is to provide a screw compressor expansion valve which is convenient for valve seat replacement, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A screw machine expansion valve with convenient valve seat replacement, comprising a valve body, which defines a first flow section, a second flow section and a connecting port connecting the first flow section with the second flow section, and also comprises a valve mechanism and an actuating mechanism, wherein the actuating mechanism comprises a stepping motor and a driving shaft connected to the stepping motor, the valve mechanism comprises a discharge piston connected to the driving shaft, a first sealing sleeve is provided on the valve body, the valve mechanism also comprises a second sealing sleeve embedded in the first sealing sleeve, a sleeve is provided in the second sealing sleeve and at the outer periphery of the discharge piston, the discharge piston is provided with a head in the valve body, and the movement of the head at the connecting port realizes the opening and closing of the connecting port.

[0007] An outer limit annular step is provided on the outer periphery of the sleeve, an inner limit annular step is provided on the end of the sleeve close to the actuating mechanism, a second movable groove is provided on the side of the second sealing sleeve close to the actuating mechanism, a first movable groove is provided on the side of the second sealing sleeve close to the first sealing sleeve, the outer limit annular step is located in the first movable groove, and the inner limit annular step is located in the second movable groove.

[0008] Preferably, an annular platform is provided on one side of the first sealing sleeve close to the valve body, and an annular sealing groove for the annular platform to be clamped is provided on one side of the valve body close to the first sealing sleeve.

[0009] Preferably, a first annular gasket is provided on a side of the head close to the first sealing sleeve.

[0010] Preferably, a first sealing ring is provided on a side of the first annular gasket close to the first sealing sleeve.

[0011] Preferably, a second sealing ring is provided on a side of the head close to the discharge piston.

[0012] Preferably, a plurality of pressure relief holes are provided on a side of the head away from the discharge piston, and a pressure relief chamber connected with the pressure relief holes is provided inside the head.

[0013] Preferably, the discharge piston is arranged to protrude from the head portion, and the length of the protruding portion is m, 0cm<m≤2.5cm.

[0014] Preferably, a pressure relief channel is provided in the discharge piston, and the pressure relief channel includes a first pressure relief channel and a second pressure relief channel, and the second pressure relief channel is provided for the channel shaft to be installed.

[0015] Preferably, the inner diameter of the second pressure relief channel is smaller than the inner diameter of the first pressure relief channel.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. By setting the sleeve in the valve actuator, the size of the valve seat and the actuator can be freely combined, so that valve seats of different sizes can be adapted to the same valve actuator. On the one hand, the cost of product development is reduced. On the other hand, when the valve seat is damaged, the valve seat can be directly replaced without adapting the corresponding valve actuator.

[0018] 2. An outer limiting annular step is provided on the outer periphery of the sleeve, the outer limiting annular step moves in the first movable groove, and an inner limiting annular step is provided at the end of the sleeve, the inner limiting annular step moves in the second movable groove, and the movable space of the sleeve is limited by the first movable groove and the second piston, thereby improving the stability of the sleeve limitation.

[0019] 3. An annular platform is provided on one side of the first sealing sleeve close to the valve body, and an annular sealing groove for the annular platform to engage is provided on one side of the valve body close to the first sealing sleeve, thereby effectively improving the sealing performance between the first sealing sleeve and the valve body.

[0020] 4. By arranging a first annular gasket on the side of the head close to the first sealing sleeve, the sealing between the head and the first sealing sleeve can be improved.

[0021] 5. By arranging the first sealing ring on the side of the first annular gasket close to the first sealing sleeve, the sealing performance between the first annular gasket and the first sealing sleeve is effectively improved.

[0022] 6. By arranging a second sealing ring on the side of the head close to the discharge piston, the sealing between the head and the discharge piston is improved.

[0023] 7. A pressure relief hole is provided on the side of the head away from the discharge piston, and a pressure relief chamber connected to the pressure relief hole is provided in the head, so that pressure can be released and noise can be reduced.

[0024] 8. Specifically in this embodiment, m is 1 cm. Such a setting can achieve noise reduction at the head of the discharge piston.

[0025] 9. By providing a pressure relief channel in the discharge piston, the pressure relief channel includes a first pressure relief channel and a second pressure relief channel, and pressure release is achieved through the first pressure relief channel and the second pressure relief channel, thereby improving the noise reduction performance.

[0026] 10. By making the inner diameter of the second pressure relief channel smaller than the inner diameter of the first pressure relief channel, the pressure relief efficiency is improved and the noise reduction performance is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the structure of the screw compressor expansion valve that facilitates valve seat replacement according to the present invention;

[0028] Figure 2 This is a cross-sectional view of the cooperation between the discharge piston and the head in the screw expansion valve for convenient valve seat replacement according to the present invention.

[0029] In the figure: 10, second sleeve; 10a, second flow section; 20, first sleeve; 20a, first flow section; 30, valve body; 40, second sealing sleeve; 50, actuating mechanism; 50a, lower shell; 50b, upper shell; 50c, stepping motor; 60, first sealing sleeve; 70, third sealing ring; 80, annular platform; 90, annular sealing groove; 100, drive shaft; 110, discharge piston; 120, sleeve; 120a, inner limit annular step; 120b, second movable groove; 120c, outer limit annular step; 130, first sealing ring; 140, first annular gasket; 150, head; 160, pressure relief hole; 170, pressure relief channel; 180, pressure relief chamber; 190, second sealing ring; 200, second annular gasket; 210, connecting port; 220, valve actuating mechanism. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] See also Figures 1-2 In an embodiment of the present invention, a screw compressor expansion valve for convenient valve seat replacement includes a valve body 30, which defines a first flow section 20a, a second flow section 10a and a connection port 210 for connecting the first flow section 20a and the second flow section 10a to each other, the lower end of the valve body 30 is provided with a first sleeve 20 and a first sleeve 10, and also includes a valve mechanism 220 and an actuating mechanism 50, the actuating mechanism 50 includes a lower shell 50a and an upper shell 50b, the actuating mechanism 50 includes a stepping motor 50c and a stepping motor 50 connected to the stepping motor 50 c connected to the drive shaft 100, the valve mechanism 220 includes a discharge piston 110 connected to the drive shaft 100, a first sealing sleeve 60 is provided on the valve body 30, the valve mechanism 220 also includes a second sealing sleeve 40 embedded in the first sealing sleeve 60, a sleeve 120 is provided in the second sealing sleeve 40 and located on the outer periphery of the discharge piston 110, the discharge piston 110 is provided with a head 150 in the valve body 30, and the movement of the head 150 at the connection port 210 realizes the opening and closing of the connection port 210. By arranging the sleeve 120 in the valve mechanism 220, the size of the valve seat and the actuator are freely combined, and valve seats of different sizes can be adapted to the same valve mechanism 220, which reduces the cost of product development on the one hand, and on the other hand, when the valve seat is damaged, the valve seat can be directly replaced without adapting the corresponding valve mechanism 220.

[0032] In this embodiment, an outer limiting annular step 120c is provided on the outer periphery of the sleeve 120, an inner limiting annular step 120a is provided on one end of the sleeve 120 close to the actuating mechanism 50, a second movable groove 120b is provided on one side of the second sealing sleeve 40 close to the actuating mechanism 50, a first movable groove is provided on one side of the second sealing sleeve 40 close to the first sealing sleeve 60, the outer limiting annular step 120c is located in the first movable groove, and the inner limiting annular step 120a is located in the second movable groove 120b. By providing an outer limiting annular step 120c on the outer periphery of the sleeve 120, the outer limiting annular step 120c moves in the first movable groove, and providing an inner limiting annular step 120a at the end of the sleeve 120, the inner limiting annular step 120a moves in the second movable groove 120b, the movable space of the sleeve 120 is limited by the first movable groove and the second piston, thereby improving the stability of the sleeve 120 limit.

[0033] In this embodiment, an annular platform 80 is provided on one side of the first sealing sleeve 60 close to the valve body 30, and an annular sealing groove 90 for the annular platform 80 to engage is provided on one side of the valve body 30 close to the first sealing sleeve 60. By providing the annular platform 80 on one side of the first sealing sleeve 60 close to the valve body 30, and providing the annular sealing groove 90 for the annular platform 80 to engage is provided on one side of the valve body 30 close to the first sealing sleeve 60, the sealing performance between the first sealing sleeve 60 and the valve body 30 can be effectively improved.

[0034] In this embodiment, a first annular gasket 140 is provided on one side of the head 150 close to the first sealing sleeve 60. By providing the first annular gasket 140 on one side of the head 150 close to the first sealing sleeve 60, the sealing performance between the head 150 and the first sealing sleeve can be improved.

[0035] In this embodiment, the first annular gasket 140 is provided with a first sealing ring 130 on one side close to the first sealing sleeve 60. By providing the first sealing ring 130 on one side of the first annular gasket 140 close to the first sealing sleeve 60, the sealing performance between the first annular gasket 140 and the first sealing sleeve 60 is effectively improved.

[0036] In this embodiment, a second sealing ring 190 is provided on one side of the head 150 close to the discharge piston 110. By providing the second sealing ring 190 on one side of the head 150 close to the discharge piston 110, the sealing between the head 150 and the discharge piston 110 is improved.

[0037] In this embodiment, a plurality of pressure relief holes 160 are provided on a side of the head 150 away from the discharge piston 110, and a pressure relief chamber 180 communicating with the pressure relief holes 160 is provided in the head 150. By providing the pressure relief holes 160 on a side of the head 150 away from the discharge piston 110, and providing the pressure relief chamber 180 communicating with the pressure relief holes 160 in the head 150, pressure can be released and noise can be reduced.

[0038] In this embodiment, the discharge piston 110 is protruded from the head 150 and the length of the protruding portion is m, 0cm<m≤2.5cm. Specifically in this embodiment, m is 1cm, and such a setting can achieve noise reduction at the head 150 of the discharge piston 110.

[0039] In this embodiment, a pressure relief channel 170 is provided in the discharge piston 110, and the pressure relief channel 170 includes a first pressure relief channel 170 and a second pressure relief channel 170, and the second pressure relief channel 170 is provided for the channel shaft to be installed. By providing the pressure relief channel 170 in the discharge piston 110, and the pressure relief channel 170 includes the first pressure relief channel 170 and the second pressure relief channel 170, pressure release is achieved through the first pressure relief channel 170 and the second pressure relief channel 170, thereby improving the noise reduction performance.

[0040] In this embodiment, the inner diameter of the second pressure relief channel 170 is smaller than the inner diameter of the first pressure relief channel 170. By making the inner diameter of the second pressure relief channel 170 smaller than the inner diameter of the first pressure relief channel 170, the pressure relief efficiency is improved and the noise reduction performance is improved.

[0041] It can be understood that a third sealing ring 70 is provided between the valve body 30 and the first sealing sleeve 60 , which can effectively improve the sealing between the valve body 30 and the first sealing sleeve 60 .

[0042] It can be understood that a second annular gasket 200 is provided between the first annular gasket 140 and the first sealing sleeve 60 , so that the sealing between the first annular gasket 140 and the first sealing sleeve 60 can be effectively improved.

[0043] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0044] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A screw compressor expansion valve for convenient valve seat replacement, comprising a valve body, which defines a first flow section, a second flow section and a connection port for interconnecting the first flow section and the second flow section, characterized in that: It also includes a valve mechanism and an actuating mechanism, the actuating mechanism includes a stepper motor and a driving shaft connected to the stepper motor, the valve mechanism includes a discharge piston connected to the driving shaft, the valve body is provided with a first sealing sleeve, the valve mechanism also includes a second sealing sleeve embedded in the first sealing sleeve, a sleeve is provided in the second sealing sleeve and located on the outer periphery of the discharge piston, the discharge piston is provided with a head in the valve body, the movement of the head at the connecting port realizes the opening and closing of the connecting port; the outer periphery of the sleeve is provided with an outer limiting annular step, the end of the sleeve close to the actuating mechanism is provided with an inner limiting annular step, the second sealing sleeve is provided with a second movable groove on the side close to the actuating mechanism, and the second sealing sleeve is close to the first sealing sleeve. A first movable groove is provided on one side, the outer limit annular step is located in the first movable groove, and the inner limit annular step is located in the second movable groove; an annular platform is provided on the side of the first sealing sleeve close to the valve body, and an annular sealing groove for the annular platform to be clamped is provided on the side of the valve body close to the first sealing sleeve; a third sealing ring is provided between the valve body and the first sealing sleeve; a first annular gasket is provided on the side of the head close to the first sealing sleeve; a second annular gasket is provided between the first annular gasket and the first sealing sleeve; a plurality of pressure relief holes are provided on the side of the head away from the discharge piston, and a pressure relief cavity connected to the pressure relief holes is provided in the head; the discharge piston protrudes from the head and the length of the protruding part is m, 0cm<m≤2.5cm.

2. A screw compressor expansion valve with convenient valve seat replacement according to claim 1, characterized in that: A first sealing ring is provided on one side of the first annular gasket close to the first sealing sleeve.

3. A screw compressor expansion valve with convenient valve seat replacement according to claim 1, characterized in that: A second sealing ring is arranged on one side of the head close to the discharge piston.

4. A screw compressor expansion valve with convenient valve seat replacement according to claim 1, characterized in that: A pressure relief channel is provided in the discharge piston, and the pressure relief channel includes a first pressure relief channel and a second pressure relief channel, and the second pressure relief channel is provided for the installation of the drive shaft.

5. A screw compressor expansion valve with convenient valve seat replacement according to claim 4, characterized in that: The inner diameter of the second pressure relief channel is smaller than the inner diameter of the first pressure relief channel.

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