Refrigerant recycling machine

Abstract

The utility model discloses a refrigerant recycling machine which comprises a box body, a motor and an air cylinder body are arranged in the box body, a valve block assembly communicated with the air cylinder body is arranged on the air cylinder body, and the valve block assembly comprises an air inlet valve cavity and an air outlet valve cavity. An air inlet assembly is arranged in the air inlet valve cavity, an air outlet assembly is arranged in the air outlet valve cavity, and valve seats are arranged at the opening ends of the air inlet valve cavity and the air outlet valve cavity. The air inlet assembly comprises a valve element and a reset spring, a limiting assembly is arranged in the air inlet valve cavity, and the limiting assembly comprises a limiting ring and a plurality of limiting rods; the limiting ring sleeves the outer layer of the valve core; the limiting rod is arranged between the reset spring and the air inlet valve cavity; a condenser is arranged on the outer side of the valve block assembly, and a pressure release valve assembly is arranged at the output end of the condenser. The valve element and the reset spring are limited and guided through the support composed of the limiting ring and the limiting rod, and the moving process of the air inlet assembly is more stable and reliable. And a pressure release valve assembly is arranged at the tail end of the condenser, so that the recycling machine works more safely and reliably.

Description

Technical Field

[0001] The utility model belongs to the technical field of recovery machines, and in particular relates to a refrigerant recovery machine. Background Art

[0002] With the strengthening of people's environmental awareness and the continuous rise in refrigerant prices, refrigerant recovery machines have become increasingly popular. One of the key components of a refrigerant recovery machine is the air intake valve. Generally, the existing air intake valve usually includes a valve block, which is provided with a valve cavity and a valve core. The outer layer of the valve core is sleeved with a return spring; the valve block is connected to the cylinder, and the piston in the cylinder will reciprocate and impact the valve core when it is working. An annular valve seat for support is often provided between the valve core and the piston, and a conical hole is provided on the annular valve seat. The existing air intake valve often only limits the upper and lower positions of the return spring. The piston works at a high frequency and for a long time, so the valve core is easy to be skewed when it is reset from the conical hole. When the valve core is skewed, it is often impacted by the piston and the return spring is often broken, resulting in the inlet valve not being able to work properly. After the piston has worked for a long time, the valve core has tilted movement and is also easy to be broken by the impact of the piston. At the same time, the valve block of the existing recovery machine is usually connected to the condenser; after the intake pressure enters the condenser, if the outlet is blocked or the valve is closed, the condenser cannot withstand the instantaneous high pressure and is easy to rupture, resulting in the recovery machine being unable to work normally. Therefore, it is necessary to design a refrigerant recovery machine to overcome the above difficulties. Summary of the invention

[0003] In view of the problems existing in the prior art, the utility model designs a refrigerant recovery machine. The utility model sets a limit assembly on the outer layer of the air intake assembly, and limits and guides the valve core and the return spring through a bracket composed of a limit ring and a limit rod, so that the valve core always moves coaxially with the piston, and the movement process of the air intake assembly is more stable and reliable. A pressure relief valve assembly is set at the end of the condenser, and the pressure is released by the pressure relief valve assembly, making the recovery machine work safer and more reliable.

[0004] The inventive object of the utility model is achieved through the following technical scheme: a refrigerant recovery machine, comprising a box body, a motor and a cylinder body are arranged in the box body, a valve block assembly connected thereto is arranged on the cylinder body, the valve block assembly comprises an air inlet valve chamber and an air outlet valve chamber; an air inlet assembly is arranged in the air inlet valve chamber, an air outlet assembly is arranged in the air outlet valve chamber, and valve seats are arranged at the open ends of the air inlet valve chamber and the air outlet valve chamber; the air inlet assembly comprises a valve core and a return spring, a limit assembly for limit guiding is arranged in the air inlet valve chamber, the limit assembly comprises a limit ring and a plurality of evenly distributed limit rods; the limit ring is arranged on the outer layer of the valve core, and the limit rod is arranged between the return spring and the air inlet valve chamber; a condenser connected thereto is arranged on the outer side of the valve block assembly, and a pressure relief valve assembly is arranged at the output end of the condenser.

[0005] Preferably, the cylinder body includes a piston, and the motor drives the piston to extend and retract relative to the valve block assembly when the motor is working; the piston is arranged adjacent to the valve seat, and is arranged in close contact with the end of the valve core; the intake assembly also includes a first seal and a positioning shaft, and the valve seat is provided with an annular groove for installing the first seal, and the first seal is arranged at the opening end of the intake valve cavity; a positioning shaft is provided between the valve seat and the valve block assembly, and the positioning shaft is arranged perpendicular to the valve seat; the limit assembly also includes a gasket, and the gasket is arranged at the end of the limit rod.

[0006] By setting the first sealing member, the air intake valve cavity and the valve seat have better sealing performance; by setting the washer to limit the end of the limit rod, the limit rod and the air intake valve cavity remain in a relatively static state. By setting the positioning shaft, the valve seat and the valve block assembly are tightly connected, so that the end faces of the valve seat and the valve block assembly are tightly fitted, and the valve core can always maintain a vertical movement state with the valve seat.

[0007] Preferably, a valve core is provided in the intake valve cavity and is coaxially arranged therewith, a first conical protrusion is provided at the end of the valve core, a conical through hole is provided on the valve seat, and the outer contour of the first conical protrusion matches the outer contour of the conical through hole; a limiting assembly is installed on the outer sleeve of the valve core, and the limiting assembly includes a plurality of limiting rods arranged side by side and distributed in a circular array; each of the limiting rods is fixedly connected to the limiting ring and the two are integrally formed, and the limiting rods and the limiting rings are combined with each other to form a bracket for limiting; the gasket is arranged at the bottom of the intake valve cavity, one end of the limiting rod is fitted with the gasket, and the other end of the limiting rod is fitted with the end face of the valve seat.

[0008] The valve core body is limited axially and radially by the limit ring, so as to ensure that the valve core moves up and down along the axial direction of the tapered through hole. Since the valve core always moves up and down relative to the axial direction of the intake valve cavity, the valve core will not be skewed, and the valve core will not be broken when the piston reciprocates to impact the valve core. At the same time, the outer layer of the limit ring is provided with a plurality of limit rods distributed in a circumferential array, each of which limits the outer side of the reset spring, and the inner side of the reset spring is already limited by the valve core, so that the reset spring is always along the axial direction of the valve core when it is extended and retracted, so the reset spring will not be skewed; the reset spring is limited by the guide when it is extended and retracted, so it has better stability and is not easy to break.

[0009] Preferably, an annular protrusion is provided on the top of the valve core, and the annular protrusion and the limit ring are coaxially arranged; a return spring is provided between the annular protrusion and the limit ring, and the return spring is a conical spring, one end of the return spring abuts against the annular protrusion, and the other end of the return spring abuts against the limit ring; the outer contour of the limit ring matches the outer contour of the valve core, and the return spring is sleeved and installed on the outer layer of the valve core.

[0010] An annular protrusion is provided on the top of the valve core, and the top of the reset spring is clamped on the annular protrusion; the bottom of the reset spring is clamped on the limit ring, and the outer layer of the reset spring is provided with a limit rod, so that the axial and radial directions of the reset spring are limited, the reset spring is not easy to skew, and the expansion and contraction process of the reset spring is more stable and reliable.

[0011] Preferably, the outer diameter of the reset spring increases gradually from top to bottom, the outer diameter of the stop ring matches the outer diameter of the bottom of the reset spring; the vertical distance from the stop ring to the annular protrusion is greater than the vertical distance from the stop ring to the valve seat. In this way, by setting the position of the stop ring, the reset spring has a larger elastic deformation stroke, and the reset effect of the valve core is better.

[0012] Preferably, the limit rod is an arc-shaped rod, and the inner wall contour of the limit rod matches the outer wall contour of the limit ring; the limit rod and the limit ring are arranged perpendicular to each other; the outer wall contour of the limit rod matches the inner wall contour of the intake valve cavity, and the outer wall of the limit rod and the inner wall of the intake valve cavity are arranged to fit each other. Since the outer wall of the limit rod fits the inner wall of the intake valve cavity, the valve core will not move radially relative to the intake valve cavity during the process of the valve core moving up and down, thus ensuring better concentricity of the valve core when moving.

[0013] Preferably, the valve block assembly is provided with an air inlet channel and an air outlet channel, the air inlet channel is communicated with the air inlet valve cavity, and the air outlet channel is communicated with the air outlet valve cavity; a passage connecting the air inlet channel and the air outlet channel is provided inside the valve block assembly; a pressure relief valve assembly is provided at the output end of the condenser, and the output end of the pressure relief valve assembly is communicated with the air inlet channel.

[0014] By providing a condenser, the medium entering the valve block assembly is cooled, thereby preventing the valve block assembly from heating up quickly, and the recovery machine can work for a long time.

[0015] Preferably, the pressure relief valve assembly includes a valve body, a sealing plug, a pressure relief spring and a top thread joint; the valve body is connected to the output end of the condenser, and the top thread joint is threadedly connected to the valve body; a sealing plug and a pressure relief spring are provided in the valve body, the sealing plug abuts against the input end of the valve body, and the pressure relief spring is arranged between the sealing plug and the top thread joint.

[0016] When the outlet passage of the valve block assembly is blocked or the valve of the external container is closed, the pressure value in the condenser will increase sharply. At this time, the intake pressure enters the pressure relief valve assembly through the output end of the condenser; the intake pressure will impact the sealing plug, and the valve body will be in a conducting state, and the pressure in the condenser will drop. When the pressure value in the condenser returns to normal, the pressure relief spring pushes the sealing plug to reset, so that the valve body is in a closed state.

[0017] Preferably, the end of the top thread joint away from the sealing plug is provided with a connector for connecting the valve block assembly; the valve body is provided with a conical pipe mouth, one end of the sealing plug is provided with a second conical protrusion, and the other end of the sealing plug is provided with a columnar protrusion; the second conical protrusion is arranged toward the conical pipe mouth, and the pressure relief spring is sleeved and installed on the outer layer of the columnar protrusion. By providing the conical pipe mouth and the second conical protrusion, the valve body has a better sealing box. By providing the connector, the valve body is conveniently connected to the valve block assembly through a pipeline.

[0018] Preferably, the limit assembly is fixedly mounted on the valve seat, the limit assembly comprises a limit ring and a limit rod, the limit rod, the limit ring and the valve seat are integrally formed; the limit rod is fixedly mounted on the upper end surface of the valve seat; the limit rod is tightly attached to the inner wall of the intake valve cavity; the return spring sleeve is installed on the outer layer of the valve core, the bottom of the return spring is arranged on the upper end surface of the limit ring, and the top of the return spring is clamped on the end of the valve core.

[0019] The limit assembly and the valve seat are integrally formed, so that the overall structural strength of the limit assembly is higher; at the same time, it is convenient to install the valve core and the return spring; when the valve seat is installed in place, the limit rod fits the inner wall of the intake valve cavity, so that when the valve seat is installed in place, the limit assembly is also installed in place; the limit ring limits the guide valve core separately, and the limiting effect is good. The limit rod is set vertically and fits the inner wall of the valve cavity, so that the valve core and the intake valve cavity have better concentricity, and the valve core and the return spring are not skewed.

[0020] Compared with the prior art, the utility model has the following beneficial effects: the utility model sets an air intake assembly in the air intake valve cavity, sets a limit assembly on the outer layer of the air intake assembly, and limits the air intake assembly axially and radially through a bracket composed of a limit ring and a plurality of limit rods, so that the valve core is always coaxially arranged with the air intake valve cavity when it moves relative to the piston, and the valve core will not be skewed when it moves. Since the valve core is limited and guided by the limit ring, the valve core can always be in a vertical working state after the piston works at a high frequency for a long time, and the valve core works stably and reliably. A reset spring is set on the outer layer of the valve core, and the inner side of the reset spring is limited by the valve core, and the outer side of the reset spring is limited by the limit rod, so that the reset spring is always in a vertical state when it is extended and retracted, and the reset spring has good stability when working and is not easy to be skewed and broken. At the same time, by setting a pressure relief valve assembly to relieve the pressure of the condenser, the generation of instantaneous high pressure inside the condenser is avoided, so that the recovery function can work stably and continuously. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional diagram of the utility model;

[0022] Figure 2 This is a schematic diagram of a hidden part of the box of the utility model;

[0023] Figure 3 This is a schematic diagram of the assembly of the valve block assembly, cylinder body and motor;

[0024] Figure 4 The internal structure diagram of the valve block assembly;

[0025] Figure 5 for Figure 4 A partial enlarged view of position A in the middle;

[0026] Figure 6 This is a schematic diagram of the assembly of the limit assembly and the air intake assembly;

[0027] Figure 7 The exploded view of the valve block assembly;

[0028] Figure 8 is a three-dimensional diagram of a valve seat;

[0029] Fig. 9 This is a schematic diagram of the assembly of the limit ring and the limit rod;

[0030] Fig.10 is the internal structure diagram of the pressure relief valve assembly;

[0031] Fig.11 It is an exploded view of the pressure relief valve assembly;

[0032] Fig.12 Schematic diagram of another installation method of the valve seat and limit stop assembly.

[0033] Markings in the figure: 1. box body; 2. motor; 3. cylinder body; 31. piston; 4. valve block assembly; 41. intake valve chamber; 42. outlet valve chamber; 5. intake assembly; 51. valve core; 52. return spring; 53. first sealing member; 54. positioning shaft; 55. first conical protrusion; 56. annular protrusion; 6. outlet assembly; 7. valve seat; 71. annular groove; 72. conical through hole; 8. limit assembly; 81. limit ring; 82. limit rod; 83. gasket; 9. pressure relief valve assembly; 91. valve body; 92. sealing plug; 93. pressure relief spring; 94. top thread joint; 95. connector; 96. conical pipe mouth; 97. second conical protrusion; 98. columnar protrusion; 10. condenser; 11. intake channel; 12. outlet channel. DETAILED DESCRIPTION

[0034] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings:

[0035] Example 1

[0036] like Figures 1 to 11As shown, the present embodiment discloses a refrigerant recovery machine, comprising a housing 1, wherein a motor 2 and a cylinder body 3 are arranged in the housing 1, and a valve block assembly 4 connected thereto is arranged on the cylinder body 3, and the valve block assembly 4 comprises an inlet valve chamber 41 and an outlet valve chamber 42; an inlet assembly 5 is arranged in the inlet valve chamber 41, and an outlet assembly 6 is arranged in the outlet valve chamber 42, and valve seats 7 are arranged at the open ends of the inlet valve chamber 41 and the outlet valve chamber 42; the inlet assembly 5 comprises a valve core 51 and a return spring 52, and a limit assembly 8 for limit guiding is arranged in the inlet valve chamber 41, and the limit assembly 8 comprises a limit ring 81 and a plurality of evenly distributed limit rods 82; the limit ring 81 is sleeved on the outer layer of the valve core 51, and the limit rod 82 is arranged between the return spring 52 and the inlet valve chamber 41; a condenser 10 connected thereto is arranged on the outer side of the valve block assembly 4, and a pressure relief valve assembly 9 is arranged at the output end of the condenser 10.

[0037] The cylinder body 3 includes a piston 31, and when the motor 2 is working, it drives the piston 31 to extend and retract relative to the valve block assembly 4; the piston 31 is arranged adjacent to the valve seat 7, and is arranged to fit together with the end of the valve core 51; the intake assembly 5 also includes a first seal 53 and a positioning shaft 54, and the valve seat 7 is provided with an annular groove 71 for installing the first seal 53, and the first seal 53 is arranged at the opening end of the intake valve chamber 41; a positioning shaft 54 ​​is provided between the valve seat 7 and the valve block assembly 4, and the positioning shaft 54 ​​is arranged perpendicular to the valve seat 7; the limit assembly 8 also includes a gasket 83, and the gasket 83 is arranged at the end of the limit rod 82. A valve core 51 is provided in the intake valve cavity 41 and is coaxially arranged therewith. A first conical protrusion 55 is provided at the end of the valve core 51. A conical through hole 72 is provided on the valve seat 7. The outer contour of the first conical protrusion 55 matches the outer contour of the conical through hole 72. A limiting assembly 8 is installed on the outer sleeve of the valve core 51. The limiting assembly 8 includes a plurality of limiting rods 82 arranged side by side and distributed in a circular array. Each limiting rod 82 is fixedly connected to a limiting ring 81 and the two are integrally formed. The limiting rod 82 and the limiting ring 81 are combined with each other to form a bracket for limiting. The gasket 83 is arranged at the bottom of the intake valve cavity 41, and one end of the limiting rod 82 is fitted with the gasket 83, and the other end of the limiting rod 82 is fitted with the end face of the valve seat 7. An annular protrusion 56 is provided on the top of the valve core 51, and the annular protrusion 56 and the limiting ring 81 are arranged coaxially; a return spring 52 is provided between the annular protrusion 56 and the limiting ring 81, and the return spring 52 is a conical spring, one end of the return spring 52 abuts on the annular protrusion 56, and the other end of the return spring 52 abuts on the limiting ring 81; the outer contour of the limiting ring 81 matches the outer contour of the valve core 51, and the return spring 52 is sleeved and installed on the outer layer of the valve core 51. The outer diameter of the return spring 52 gradually increases from top to bottom, and the outer diameter of the limiting ring 81 matches the outer diameter of the bottom of the return spring 52; the vertical distance from the limiting ring 81 to the annular protrusion 56 is greater than the vertical distance from the limiting ring 81 to the valve seat 7. The limiting rod 82 is an arc-shaped rod, and the inner wall contour of the limiting rod 82 matches the outer wall contour of the limiting ring 81; the limiting rod 82 and the limiting ring 81 are arranged perpendicular to each other; the outer wall contour of the limiting rod 82 matches the inner wall contour of the intake valve cavity 41, and the outer wall of the limiting rod 82 and the inner wall of the intake valve cavity 41 are arranged to fit each other.

[0038] The valve block assembly 4 is provided with an air inlet channel 11 and an air outlet channel 12, the air inlet channel 11 is communicated with the air inlet valve chamber 41, and the air outlet channel 12 is communicated with the air outlet valve chamber 42; a passage connecting the air inlet channel 11 and the air outlet channel 12 is provided inside the valve block assembly 4; a pressure relief valve assembly 9 is provided at the output end of the condenser 10, and the output end of the pressure relief valve assembly 9 is communicated with the air inlet channel 11. The pressure relief valve assembly 9 includes a valve body 91, a sealing plug 92, a pressure relief spring 93 and a top thread joint 94; the valve body 91 is connected to the output end of the condenser 10, and the top thread joint 94 is threadedly connected to the valve body 91; a sealing plug 92 and a pressure relief spring 93 are provided inside the valve body 91, the sealing plug 92 abuts against the input end of the valve body 91, and the pressure relief spring 93 is arranged between the sealing plug 92 and the top thread joint 94. The end of the top thread joint 94 away from the sealing plug 92 is provided with a connecting piece 95 connected to the valve block assembly 4; a conical pipe mouth 96 is provided on the valve body 91, a second conical protrusion 97 is provided at one end of the sealing plug 92, and a columnar protrusion 98 is provided at the other end of the sealing plug 92; the second conical protrusion 97 is arranged toward the conical pipe mouth 96, and the pressure relief spring 93 is sleeved and installed on the outer layer of the columnar protrusion 98.

[0039] The specific operation process of this embodiment is as follows: the container of the medium to be recovered is connected through the air inlet channel 11, and the container for storing the recovered medium is connected through the air outlet channel 12. When the motor 2 is working, it drives the cylinder body 3 to work, and the piston 31 in the cylinder body 3 will reciprocate to impact the valve seat 7, so that the valve core 51 in the intake valve chamber 41 will reciprocate and move; the air inlet channel 11 is connected to the intake valve chamber 41, and the air outlet channel 12 is connected to the outlet valve chamber 42, so that after the cylinder body 3 continues to work, the medium can be extracted into the valve block assembly 4, and then enter the container for storing the recovered medium along the air outlet channel 12. Since the outer layer of the valve core 51 is provided with a limit ring 81, and the outer layer of the limit ring 81 is provided with a limit rod 82, the limit rod 82 is in contact with the inner wall of the intake valve chamber 41, so that the valve core 51 can always move axially relative to the piston 31, and the valve core 51 will not be skewed when moving. At the same time, the outer sleeve of the valve core 51 is installed with a return spring 52; the top of the return spring 52 is limited by the annular protrusion 56, and the bottom of the return spring 52 is limited by the limit ring 81; the inner side of the return spring 52 is limited by the valve core 51, and the outer side of the return spring 52 is limited by the limit rod 82. In this way, the return spring 52 is always arranged coaxially with the valve core when it is extended and retracted, so the return spring 52 is not easily skewed or broken, and the return spring 52 can work reliably for a long time.

[0040] When the outlet passage 12 of the valve block assembly 4 is blocked or the valve of the external container is closed, the pressure value in the condenser 10 will increase sharply, and the intake pressure will enter the pressure relief valve assembly 9 through the output end of the condenser 10; the intake pressure will impact the sealing plug 92, and the valve body 91 will be in a conducting state, and the pressure in the condenser 10 will drop. When the pressure value in the condenser 10 returns to normal, the pressure relief spring 93 pushes the sealing plug 92 to reset, so that the valve body 91 is in a closed state.

[0041] Example 2

[0042] like Fig.12 As shown, this embodiment 2 discloses another installation method of the limit assembly 8. The assembly method of the valve seat 7 and the limit assembly 8 in this embodiment is different from that in the embodiment 1. The present embodiment discloses a refrigerant recovery machine, comprising a housing 1, wherein a motor 2 and a cylinder body 3 are arranged in the housing 1, wherein a valve block assembly 4 connected thereto is arranged on the cylinder body 3, wherein the valve block assembly 4 comprises an inlet valve chamber 41 and an outlet valve chamber 42; an inlet assembly 5 is arranged in the inlet valve chamber 41, and an outlet assembly 6 is arranged in the outlet valve chamber 42, and valve seats 7 are arranged at the open ends of the inlet valve chamber 41 and the outlet valve chamber 42; the inlet assembly 5 comprises a valve core 51 and a return spring 52, and a limit assembly 8 for limit guiding is arranged in the inlet valve chamber 41, and the limit assembly 8 comprises a limit ring 81 and a plurality of evenly distributed limit rods 82; the limit ring 81 is sleeved on the outer layer of the valve core 51, and the limit rod 82 is arranged between the return spring 52 and the inlet valve chamber 41; a condenser 10 connected thereto is arranged on the outer side of the valve block assembly 4, and a pressure relief valve assembly 9 is arranged at the output end of the condenser 10. The limit assembly 8 is fixedly mounted on the valve seat 7, and the limit assembly 8 includes a limit ring 81 and a limit rod 82, and the limit rod 82, the limit ring 81 and the valve seat 7 are integrally formed; the limit rod 82 is fixedly mounted on the upper end surface of the valve seat 7; the limit rod 82 is tightly attached to the inner wall of the intake valve cavity 41; the return spring 52 is sleeved and mounted on the outer layer of the valve core 51, and the bottom of the return spring 52 is arranged on the upper end surface of the limit ring 81, and the top of the return spring 52 is stuck at the end of the valve core 51.

[0043] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A refrigerant recovery machine, comprising a housing (1), wherein a motor (2) and a cylinder body (3) are arranged in the housing (1), characterized in that: A valve block assembly (4) is provided on the cylinder body (3) and is in communication with the cylinder body. The valve block assembly (4) comprises an intake valve chamber (41) and an outlet valve chamber (42). An intake assembly (5) is provided in the intake valve chamber (41), and an outlet valve chamber (6) is provided in the outlet valve chamber (42). Valve seats (7) are provided at the open ends of the intake valve chamber (41) and the outlet valve chamber (42). The intake assembly (5) comprises a valve core (51) and a return spring (52). The intake valve chamber (41) is provided with a valve core (51) and a return spring (52). ) is provided with a limit assembly (8) for limit guiding, the limit assembly (8) comprising a limit ring (81) and a plurality of evenly distributed limit rods (82); the limit ring (81) is sleeved on the outer layer of the valve core (51), and the limit rod (82) is arranged between the return spring (52) and the intake valve cavity (41); the outer side of the valve block assembly (4) is provided with a condenser (10) interconnected therewith, and the output end of the condenser (10) is provided with a pressure relief valve assembly (9).

2. The refrigerant recovery machine according to claim 1, characterized in that: The cylinder body (3) comprises a piston (31), and when the motor (2) is working, the piston (31) is driven to expand and contract relative to the valve block assembly (4); the piston (31) is arranged adjacent to the valve seat (7), and is arranged to fit with the end of the valve core (51); the intake assembly (5) also comprises a first sealing member (53) and a positioning shaft (54), and the valve seat (7) is provided with an annular groove (71) for installing the first sealing member (53), and the first sealing member (53) is arranged at the opening end of the intake valve chamber (41); a positioning shaft (54) is provided between the valve seat (7) and the valve block assembly (4), and the positioning shaft (54) is arranged perpendicular to the valve seat (7); the limit assembly (8) also comprises a gasket (83), and the gasket (83) is arranged at the end of the limit rod (82).

3. The refrigerant recovery machine according to claim 2, characterized in that: A valve core (51) coaxially arranged therewith is provided in the intake valve cavity (41), a first conical protrusion (55) is provided at the end of the valve core (51), a conical through hole (72) is provided on the valve seat (7), and the outer contour of the first conical protrusion (55) matches the outer contour of the conical through hole (72); a limiting assembly (8) is mounted on the outer sleeve of the valve core (51), and the limiting assembly (8) comprises a plurality of limiting rods (82) arranged side by side and distributed in a circumferential array; each limiting rod (82) is fixedly connected to a limiting ring (81) and the two are integrally formed, and the limiting rods (82) and the limiting ring (81) are combined to form a bracket for limiting; the gasket (83) is arranged at the bottom of the intake valve cavity (41), one end of the limiting rod (82) is mutually fitted with the gasket (83), and the other end of the limiting rod (82) is mutually fitted with the end face of the valve seat (7).

4. The refrigerant recovery machine according to claim 2, characterized in that: An annular protrusion (56) is provided on the top of the valve core (51), and the annular protrusion (56) and the limiting ring (81) are coaxially arranged; a return spring (52) is provided between the annular protrusion (56) and the limiting ring (81), and the return spring (52) is a conical spring, one end of the return spring (52) abuts against the annular protrusion (56), and the other end of the return spring (52) abuts against the limiting ring (81); the outer contour of the limiting ring (81) matches the outer contour of the valve core (51), and the return spring (52) is sleeved and installed on the outer layer of the valve core (51).

5. The refrigerant recovery machine according to claim 4, characterized in that: The outer diameter of the return spring (52) increases gradually from top to bottom, and the outer diameter of the limiting ring (81) matches the outer diameter of the bottom of the return spring (52); the vertical distance from the limiting ring (81) to the annular protrusion (56) is greater than the vertical distance from the limiting ring (81) to the valve seat (7).

6. The refrigerant recovery machine according to claim 2, characterized in that: The limiting rod (82) is an arc-shaped rod, and the inner wall contour of the limiting rod (82) matches the outer wall contour of the limiting ring (81); the limiting rod (82) and the limiting ring (81) are arranged perpendicular to each other; the outer wall contour of the limiting rod (82) matches the inner wall contour of the intake valve cavity (41), and the outer wall of the limiting rod (82) and the inner wall of the intake valve cavity (41) are arranged to fit each other.

7. The refrigerant recovery machine according to claim 1, characterized in that: The valve block assembly (4) is provided with an air inlet channel (11) and an air outlet channel (12); the air inlet channel (11) is communicated with the air inlet valve chamber (41), and the air outlet channel (12) is communicated with the air outlet valve chamber (42); a passage connecting the air inlet channel (11) and the air outlet channel (12) is provided inside the valve block assembly (4); and a pressure relief valve assembly (9) is provided at the output end of the condenser (10), and the output end of the pressure relief valve assembly (9) is communicated with the air inlet channel (11).

8. The refrigerant recovery machine according to claim 7, characterized in that: The pressure relief valve assembly (9) comprises a valve body (91), a sealing plug (92), a pressure relief spring (93) and a top thread joint (94); the valve body (91) is connected to the output end of the condenser (10), and the top thread joint (94) is threadedly connected to the valve body (91); a sealing plug (92) and a pressure relief spring (93) are arranged in the valve body (91), the sealing plug (92) abuts against the input end of the valve body (91), and the pressure relief spring (93) is arranged between the sealing plug (92) and the top thread joint (94).

9. The refrigerant recovery machine according to claim 8, characterized in that: The end of the top thread joint (94) away from the sealing plug (92) is provided with a connecting piece (95) connected to the valve block assembly (4); a conical pipe mouth (96) is provided on the valve body (91), a second conical protrusion (97) is provided at one end of the sealing plug (92), and a columnar protrusion (98) is provided at the other end of the sealing plug (92); the second conical protrusion (97) is arranged toward the conical pipe mouth (96), and the pressure relief spring (93) is sleeved and installed on the outer layer of the columnar protrusion (98).

10. The refrigerant recovery machine according to claim 1, characterized in that: The limit assembly (8) is fixedly mounted on the valve seat (7), and the limit assembly (8) comprises a limit ring (81) and a limit rod (82), wherein the limit rod (82), the limit ring (81) and the valve seat (7) are integrally formed; the limit rod (82) is fixedly mounted on the upper end surface of the valve seat (7); the limit rod (82) is tightly attached to the inner wall of the intake valve cavity (41); the return spring (52) is sleeved and mounted on the outer layer of the valve core (51), the bottom of the return spring (52) is arranged on the upper end surface of the limit ring (81), and the top of the return spring (52) is clamped on the end of the valve core (51).

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