CN103791663B - A kind of with the heating power expansion valve being unidirectionally controlled function - Google Patents

Abstract

The invention discloses a thermal expansion valve with a one-way control function, which comprises a valve body with an inlet channel and an outlet channel, a temperature-sensing component placed at one end of the valve body, and a first valve placed in the inner cavity of the valve body The core part, the first valve core part includes a valve stem abutting against the temperature sensing part, and a first valve core that cooperates with the first valve port arranged in the inner cavity to control the medium fluid flow rate from the inlet passage to the outlet passage; the valve The body also includes an accommodating portion extending from the inlet passage to the valve body, a second valve port is opened on the accommodating portion, a second valve core component is arranged in the accommodating portion, and a valve for limiting the opening of the second valve core component to the working position is also arranged in the accommodating portion. When the medium flows from the inlet channel to the outlet channel, the second valve port is closed; when the medium flows from the outlet channel to the inlet channel, the second valve port is opened. Compared with the prior art, the present invention can effectively reduce the impact on the flow capacity of the one-way valve on the basis of improving the processing technology.

Description

A thermal expansion valve with one-way control function

technical field

The invention relates to the technical field of refrigeration components, in particular to a thermal expansion valve with a one-way control function.

Background technique

The thermal expansion valve as a throttling device is widely used in the circuit of the refrigeration system to control the flow of the refrigerant by sensing the temperature and pressure of the refrigerant at a specific location; with the continuous promotion of commercial refrigeration equipment, the thermal expansion valve is used in commercial It is also widely used in large capacity refrigeration systems.

In the prior art, if the evaporator and condenser are far away from the compressor pipeline in the refrigeration system (greater than 25 meters), the thermal expansion valve is realized by connecting a check valve in parallel (the direction is opposite to that of the expansion valve). , to improve system stability. The flow direction of the one-way valve is opposite to the flow direction of the expansion valve port. When the system refrigerant flows forward (the inlet flows to the outlet), the one-way valve is closed due to the pressure difference, and the thermal expansion valve works; when the system refrigerant flows in the reverse direction, the one-way The valve opens due to differential pressure, and the thermal expansion valve does not work. However, separate check valves and bypass channels increase installation and maintenance costs, as do potential leaks.

Based on the above situation, in recent years, in order to simplify the components of the refrigeration system, the thermal expansion valve with a one-way control function has been gradually popularized in the refrigeration system instead of a single expansion valve and a one-way valve. The patent document with the Chinese application number CN200310103606 discloses a thermal expansion valve. Specifically as shown in Figure 1, the thermal expansion valve specifically includes a valve body 54', on which an inlet channel and an outlet channel are arranged, and an inner cavity communicating with the inlet channel and the outlet channel is processed in the valve body 54' 40'. A valve port 42' is provided in the inner cavity 40'. The temperature sensing component 30' is placed at one end of the valve body 54' and closes the inner cavity 40'. The valve core part is placed in the inner cavity 40', the valve stem 32' of the valve core part abuts against the temperature sensing part 30', and the valve core 33' of the valve core part cooperates with the valve port 42' to control the flow from the inlet passage to the outlet Channel media fluid flow. A nut cover 64' is also installed in the valve body 54', which has an accommodating hole 48' communicating with the inner chamber 40'. A valve core 70' is arranged in the accommodation hole 48', and an auxiliary valve port 50' is processed on the valve body 54'. When the medium flows from the inlet channel to the outlet channel, the auxiliary valve port 50' is closed; when the medium flows from the outlet channel to the inlet channel, the auxiliary valve port 50' is opened.

Apparently, although the above-mentioned structure can integrate a single expansion valve and a one-way valve into an integrated structure, since it is necessary to process an opening on the valve body to install a nut cover and install a one-way valve device, it is easy to cause leakage of the expansion valve. It directly leads to a decrease in the reliability of the product. In addition, this structure is complex and requires high processing technology. At the same time, the flow path in the prior art with a one-way opening channel is curved and complicated, and the flow resistance is relatively large, which has an adverse effect on the system.

In view of this, there is an urgent need to optimize the structure of the existing thermal expansion valve with a check valve, so as to improve the processing technology and work reliability, and reduce the influence of the check valve spool limit structure on the flow capacity of the check valve.

Contents of the invention

In view of the above defects, the technical problem solved by the present invention is to provide a thermal expansion valve with a one-way control function, which can effectively reduce the impact on the flow capacity of the one-way valve on the basis of improving the processability.

The thermal expansion valve with one-way control function provided by the present invention comprises a valve body with an inlet channel and an outlet channel, a temperature sensing component placed at one end of the valve body, and a valve body placed in the inner cavity of the valve body. The first valve core part, the first valve core part includes a valve stem abutting against the temperature sensing part, and cooperates with the first valve port provided in the inner cavity to control the flow from the inlet channel to the The first spool of the medium fluid flow of the outlet passage; the valve body also includes a receiving part extending from the inlet passage to the valve body, and a second valve port is opened on the receiving part, and in the receiving part A second valve core part is provided, and a limit pin rod that restricts the opening working position of the second valve core part is arranged in the receiving part; when the medium flows from the inlet channel to the outlet channel, the first The second valve port is closed; when the medium flows from the outlet channel to the inlet channel, the second valve port is opened.

Preferably, a guide hole communicating with the accommodating portion is opened on the valve body, and the limit pin rod is inserted and fixed in the guide hole.

Preferably, opposite to the guide hole in the axial direction, a positioning blind hole is opened on the other side wall of the accommodating portion, and the inner end of the limiting pin rod is placed in the positioning blind hole.

Preferably, in a projected plane perpendicular to the displacement direction of the second valve core component, the area ratio of the limit pin rod located in the receiving part to the receiving part is less than 0.2.

Preferably, the axis of the second spool part is arranged coaxially with the center of the inlet channel.

Preferably, an elastic member is provided at a position where the limit pin rod cooperates with the second valve core member.

Preferably, the setting direction of the limit pin rod is perpendicular to the displacement direction of the second valve core component.

In the thermal expansion valve with one-way control function provided by the present invention, the accommodating part of the second valve core part is an extension part of the inlet channel on the valve body, which does not require additional processing of holes and is convenient for structural processing; at the same time, the second The valve core part is built into the valve body, which is easy and reliable to install and reduces the hidden danger of leakage. In addition, this solution adopts the limit pin rod to limit the opening working position of the second valve core part, which can also greatly reduce the obstruction of the limit to the flow channel, and provide reliable guarantee for the poppet valve function.

In the preferred solution of the present invention, the limit pin rod is inserted and fixed in the guide hole opened on the valve body, and the process is relatively simple. Preferably, opposite to the guide hole in the axial direction, a positioning blind hole is opened on the other side wall of the receiving part to accommodate the inner end of the limit pin rod, so that the limit pin rod in a better stressed state can avoid The possible damage caused by abnormal pressure shock can further improve the working stability.

In another preferred solution of the present invention, the axis line of the second valve core part is coaxially arranged with the center line of the inlet passage, so that the fluid resistance is reduced and the environment of the flow system is improved.

Description of drawings

Fig. 1 is a schematic structural diagram of a typical thermal expansion valve with a one-way control function in the prior art;

Fig. 2 is a structural schematic diagram of a thermal expansion valve with a one-way control function described in an embodiment of the specific implementation;

Fig. 3 is a schematic diagram of the valve body structure of the thermal expansion valve shown in Fig. 2;

Fig. 4 is A-A sectional view of Fig. 3;

Fig. 5 is a schematic structural view of the second spool shown in Fig. 2;

Fig. 6 is a structural schematic diagram of a thermal expansion valve with a one-way control function described in the second embodiment of the specific implementation;

Fig. 7 is a schematic diagram of the valve body structure of the thermal expansion valve shown in Fig. 6 .

In Figure 2-Figure 7:

Valve body 1, inlet channel 11, outlet channel 12, inner cavity 13, first valve port 14, second valve port 15, housing part 16, hole 17, guide hole 191, positioning blind hole 192, temperature sensing component 2, second valve port A connecting passage 31, a second connecting passage 32, a bottom end surface 33, a first valve core part 4, a valve stem 41, a valve core 42, a second valve core part 5, a second valve core 52, a first segment 521, a second Section 522 , elastic member 53 , limit pin rod 55 , connecting pipe 6 , connecting pipe 7 , valve seat assembly 8 , valve supporting seat 81 , spring 82 , base 83 .

detailed description

The core of the present invention is to provide a structurally optimized thermal expansion valve with a one-way control function, so as to effectively reduce the influence on the flow capacity of the one-way valve on the basis of improving the processing technology. The following describes in detail through two embodiments in conjunction with the accompanying drawings.

Example 1:

Please refer to FIG. 2 and FIG. 3 , wherein FIG. 2 is a schematic structural diagram of the thermal expansion valve with one-way control function described in the first embodiment, and FIG. 3 is a schematic structural schematic diagram of the valve body of the thermal expansion valve in FIG. 2 .

As shown in Figure 2 and Figure 3. In this embodiment, the thermal expansion valve includes a valve body 1, on which an inlet channel 11 and an outlet channel 12 are arranged, and an inner cavity 13 communicating with the inlet channel 11 and the outlet channel 12 is processed in the valve body 1, The temperature sensing component 2 is placed at one end of the valve body 1 . The inner cavity 13 of the valve body 1 also includes a vertical through hole 17 communicating with the temperature sensing component 2 , the lower part of the hole 17 intersects with the inner cavity 13 to form a first valve port 14 .

The first valve core part 4 is provided through the through hole 17 in the inner cavity 13, and the first valve core part 4 includes a valve stem 41 and a valve core 42, and the valve stem 41 abuts on the temperature sensing part 2. As shown in the figure, the valve stem 41 and the valve core 42 in this embodiment are integrally formed, of course, they can also be combined after separate processing.

A valve seat assembly 8 is also provided in the inner cavity 13 of the valve body 1 , the valve seat assembly 8 includes a base 83 fixed on the valve body 1 , and a valve support seat 81 abutting against the valve core 42 through a spring 82 . In this embodiment, the connecting pipe 6 for fluid inflow and the connecting pipe 7 for fluid outflow are airtightly welded on the valve body 1 . The connecting pipe 6 communicates with the inlet passage 11 , while the connecting pipe 7 directly extends into the outlet passage 12 and directly abuts against its bottom end surface 33 . The inner chamber 13 of the valve body 1 communicates with the outlet passage 12 through a first connecting passage 31 . Preferably, the outlet channel 12 can be arranged in parallel with the first communication channel 31 , so that the resistance of fluid entering the outlet channel 12 from the first communication channel 31 can be reduced.

In addition, in order to reduce the pipe diameter of the connecting pipe 7, the cross section of the first communication channel 31 can be designed as a roughly elliptical structure, please refer to FIG. 4 for details, which is a cross-sectional view along AA of FIG. 3 . Such arrangement can reduce the axial width of the first communication channel 31 , for example, it can be designed as an ellipse or a racetrack-like structure.

Wherein, the spool 42 of the first spool part 4 cooperates with the valve port 14 to control the medium fluid flow rate flowing from the inlet passage 11 to the outlet passage 12, that is, when the pressure in the temperature-sensing member 2 increases, the transmission of the temperature-sensing member 2 The sheet pushes the first spool part 4 to move downward against the force of the spring 82, and the opening between the spool 42 and the first valve port 14 increases to increase the fluid flow; on the contrary, when the pressure in the temperature sensing part 2 When lowering, the first spool part 4 moves upward under the restoring force of the spring 82 , and the opening between the spool 42 and the first valve port 14 decreases, resulting in less fluid flow.

In the direction of the coaxial line with the inlet passage 11, a housing part 16 is formed extending into the valve body 1. In this embodiment, the housing part 16 and the inlet passage 11 are specifically set as concentric stepped holes, and are formed at the bottom of the stepped hole. The second valve port 15, the accommodating part 16 and the outlet channel 12 are connected through the second connecting channel 32, and the outlet channel 12 and the second connecting channel 32 are arranged in parallel, which can reduce the flow of fluid from the outlet channel 12 into the second valve port 15. The resistance of the two connecting channels 32 .

The second valve core part 5 is also arranged in the receiving part 16 , and the valve stem 41 traverses between the receiving part 16 and the inlet channel 11 . Of course, in the present invention, the accommodating portion 16 can also be a hole of the same diameter as the extension of the inlet passage 11, that is, the accommodating portion and the inlet passage are actually two parts of a hole, and correspondingly, the second valve port 15 can be opened in this bottom of the hole.

As shown in the figure, the second spool component 5 includes a second spool 52 and a limiting pin rod 55 built in the accommodating portion 16 . Wherein, the second valve core 52 specifically includes a first section 521 and a second section 522, please refer to Figure 5 for details, the second section 522 is the valve core body that cooperates with the limit pin rod 55, and the first section 521 is a conical structure And cooperate with the second valve port 15 ; wherein, the limit pin rod 55 is used to limit the open working position of the second valve core 52 .

During the working process, when the medium flows from the inlet passage 11 to the outlet passage 12, the expansion valve throttles, and under the action of fluid pressure, the second valve core 52 abuts against the second valve port 15, so that the valve port 15 is closed state; and when the medium flows from the outlet passage 12 to the inlet passage 11, under the fluid pressure, the second valve core 52 is away from the second valve port 15, so that the valve port 15 is in an open state. In this state, the second The second spool 52 is offset against the limit pin rod 55, and the expansion valve does not work.

The design of the above scheme makes the thermal expansion valve meet the unidirectional control function, and can greatly reduce the obstruction of the limit to the flow channel, with a compact structure and convenient processing; at the same time, the second valve core part is easy and reliable to install and does not require additional processing hole, reducing the hidden danger of leakage.

2 and 3, the valve body 1 is provided with a guide hole 191 communicating with the accommodating portion 16, so that the limit pin rod 55 is inserted and fixed in the guide hole 191; it can be understood that the limit pin The cross-sectional shape of the rod 55 and the guide hole 191 matching it can be selected arbitrarily, for example, a circular cross-section or a polygonal cross-section. Obviously, the round section is the best for craftsmanship. In fact, the outer end of the guide hole may have a reaming section (not shown in the figure), and the outer end of the limit pin rod has a limit part that matches the reaming section, so as to precisely control the relative position of the limit pin rod. The positional relationship of the valve body.

As we all know, the medium in the valve body 1 has a certain working pressure, and the outer end of the limit pin rod 55 and the guide hole 191 are sealed and connected, or a local tight fit or a plug can be used to ensure sealing. Preferably, the sealing connection is realized by applying anaerobic glue.

In addition, the inner end of the limit pin rod 55 is lower than the center line of the second valve core 52 , which is the optimal force-bearing state. Preferably, the setting direction of the limit pin rod 55 is perpendicular to the displacement direction of the second valve core component 5 , thus, the two have a larger contact area in a limit state.

In order to control the influence of the limiting pin rod 55 on the flow area of the flow channel where the second valve core component 5 is located, the limiting pin rod 55 located in the accommodating portion 16 can be controlled in the projection plane perpendicular to the displacement direction of the second valve core component 5 . The area ratio of the position pin rod 55 to the accommodating portion 16 is less than 0.2, so as to reduce the obstruction to the flow channel under the condition of ensuring the impact resistance strength. In addition, the axis line of the second valve core part 5 is arranged coaxially with the center line of the inlet channel 11, which can also effectively control the flow resistance of the flow channel where the second valve core part 5 is located.

On this basis, an elastic member 53 can also be provided at the matching position of the limit pin rod 55 and the second valve core member 5 , so that the impact of the fluid pressure at the moment when the second valve core 52 is opened can be suppressed by the elastic member 53 Appropriate absorption can prevent the second valve core 52 from directly pressing against the limit pin rod 55 to form opening noise.

Example 2:

Compared with the first embodiment, this embodiment has the same main body composition and connection relationship. The difference is that in this solution, a further positioning function is added to the inner end of the limit pin rod 55 .

Please refer to Figure 6 and Figure 7 together, wherein Figure 6 is a schematic structural diagram of a thermal expansion valve with one-way control function described in the second embodiment; Figure 7 is a valve body of the thermal expansion valve shown in Figure 6 Schematic. In order to clearly show the difference between this solution and the first embodiment, components and structures with the same function are marked with the same reference numerals.

As shown in FIGS. 6 and 7 , opposite to the guide hole 191 in the axial direction, a blind positioning hole 192 is opened on the other side wall of the receiving portion 16 , and the inner end of the limit pin rod 55 is placed in the blind positioning hole 192 . In this solution, the inwardly extending end of the limit pin rod 55 is reliably positioned, which is different from the cantilever beam stress state in the first embodiment, and further improves its working stability.

In particular, the figure of this embodiment does not show the elastic member 53 arranged at the matching position of the limit pin rod 55 and the second valve core member 5. Obviously, according to actual needs, those skilled in the art refer to the first The embodiment is realized.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (7)

1. with being unidirectionally controlled the heating power expansion valve of function, including with access road (11) and the valve of exit passageway (12) Body (1), the temperature sensing part (2) being placed in described valve body (1) one end, the first valve hole part of being placed in the inner chamber of described valve body (1) (4), described first valve hole part (4) includes the valve rod (41) abutting described temperature sensing part (2), and be arranged on described inner chamber (13) the first valve port (14) in coordinates to control to flow to the medium stream of described exit passageway (12) from described access road (11) First spool (42) of body flow；It is characterized in that, described valve body (1) also includes from described access road (11) to described valve body (1) receiving portion (16) extended in, described accommodation section (16) offer the second valve port (15), arrange in described accommodation section (16) There is the second valve hole part (5), described accommodation section (16) are additionally provided with described second valve hole part (5) of restriction and open operating position Spacing pin rod (55)；When medium flows to described exit passageway (12) from described access road (11), described second valve port (15) close；When medium flows to described access road (11) from described exit passageway (12), described second valve port (15) is opened；

The pilot hole (191) connected with described accommodation section (16), described spacing pin rod (55) plug-in mounting is offered on described valve body (1) It is fixedly installed in described pilot hole (191).

The most according to claim 1 with the heating power expansion valve being unidirectionally controlled function, it is characterised in that with described pilot hole (191) axially opposingly, another sidewall of described accommodation section (16) offers Blind locating holes (192), described spacing pin rod (55) Inner end be placed in described Blind locating holes (192) in.

It is the most according to any one of claim 1 to 2 with the heating power expansion valve being unidirectionally controlled function, it is characterised in that In the perspective plane being perpendicular to described second valve hole part (5) direction of displacement, it is positioned at the described spacer pin of described accommodation section (16) Bar (55) is less than 0.2 with the area ratio of described accommodation section (16).

The most according to claim 3 with the heating power expansion valve being unidirectionally controlled function, it is characterised in that described second spool The axial line of parts (5) is coaxially disposed with the centrage of described access road (11).

The most according to claim 4 with the heating power expansion valve being unidirectionally controlled function, it is characterised in that described spacing pin rod (55) elastomeric element (53) is set with at the cooperation position of described second valve hole part (5).

The most according to claim 3 with the heating power expansion valve being unidirectionally controlled function, it is characterised in that described spacing pin rod (55) setting direction is perpendicular with the direction of displacement of described second valve hole part (5).

The most according to claim 4 with the heating power expansion valve being unidirectionally controlled function, it is characterised in that described spacing pin rod (55) setting direction is perpendicular with the direction of displacement of described second valve hole part (5).