A combined relay based on two small PCB relays

Abstract

The present invention discloses a combined relay based on two small PCB relays, which includes two relays with the same structure and without a housing; the relay includes a base and coil lead-out pins, moving contact lead-out pins and static contact lead-out pins distributed on the base; on one side of the base in the length direction, a groove and a protrusion are respectively provided at equal distances on both sides corresponding to the midline of the length of the base. When the two relays are spliced, one of the relays is rotated 180 degrees and then paired with the other relay, so that the grooves and protrusions of the two relays are respectively inserted and matched. The present invention can not only effectively ensure the safety distance between the static contact lead-out pins and between the moving contact lead-out pins of the two relays by using one set of molds, thus achieving the purpose of simplifying the manufacturing process and reducing the manufacturing cost; but also there is no need to set complex limiting structures on the outer shell, simplifying the structure of the outer shell and realizing the miniaturization of the product.

Description

Technical Field

[0001] The present invention relates to the technical field of relays, and particularly to a combined relay based on two small PCB relays. Background Art

[0002] A PCB relay is a relay used for mounting on a PCB (i.e., printed circuit board). Since the mounting space on the PCB is limited, the volume of the PCB relay is usually designed to be small. With the continuous expansion of the application fields of PCB relays, an application scenario of an existing PCB relay requires the use of two PCB relays. Due to the limited mounting space on the PCB, mounting two separate PCB relays on the PCB will occupy a large space. Therefore, in the prior art, two PCB relays are assembled together to form a combined relay. In order to ensure the safety distance between the static contact leads and between the moving contact leads of the two relays, the prior art needs to carefully design the layout of the leads of the two relays. That is to say, two sets of molds are required to manufacture the two relays, resulting in the disadvantages of cumbersome manufacturing processes and high manufacturing costs. In addition, in order to limit the two relays, the prior art thickens the outer shell and performs limiting by setting retaining walls or ribs, etc., resulting in the disadvantages of complex outer shell structures and increased product volume, which is not conducive to the miniaturization of the product. Summary of the Invention

[0003] An object of the present invention is to overcome the deficiencies of the prior art and provide a combined relay based on two small PCB relays. Through structural improvements, on the one hand, it is possible to effectively ensure the safety distance between the static contact leads and between the moving contact leads of the two relays by using a single set of molds, thereby achieving the purpose of simplifying the manufacturing process and reducing the manufacturing cost; on the other hand, there is no need to set a complex limiting structure on the outer shell, simplifying the structure of the outer shell and realizing the miniaturization of the product.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a combined relay based on two small PCB relays, including two relays with the same structure and without a housing; the relay includes a base; the projection of the base on the bottom plane is rectangular in shape; on one side of the base in the length direction, a groove and a convex block are respectively provided at equal distances on both sides corresponding to the median line of the length of the base, and the groove and the convex block can be correspondingly matched; when the two relays are spliced, one of the relays is rotated 180 degrees and then paired with the other relay, so that the groove and the convex block of the base of the one relay are respectively inserted and matched with the convex block and the groove of the base of the other relay, thereby mutually limiting the bases of the two relays in three-dimensional space.

[0005] The relay further includes a coil lead pin, a moving contact lead pin, and a static contact lead pin distributed on the base; the coil lead pin and the static contact lead pin are disposed at one end of the length of the base, and the moving contact lead pin is disposed at the other end of the length of the base; when the groove and the protrusion of the base of one of the relays are respectively inserted and mated with the protrusion and the groove of the base of the other relay, the coil lead pins, the moving contact lead pins, and the static contact lead pins of the two relays are misaligned in the length direction of the relay.

[0006] Arc-shaped chamfers are respectively provided on both sides of the front end of the insertion direction of the protrusion and the groove.

[0007] The relay further includes a coil bobbin, the coil bobbin has an iron core mounting hole for mounting an iron core, and the iron core mounting hole of the coil bobbin is vertically arranged; the coil bobbin has an upper flange and a lower flange, and a winding window is formed between the upper flange and the lower flange; the lower flange of the coil bobbin and the base are of an integral structure; the upper flange of the coil bobbin horizontally extends towards one end of the length of the base and is provided with a static contact mounting seat.

[0008] The relay further includes a normally open static contact terminal and a normally closed static contact terminal, and the normally open static contact terminal and the normally closed static contact terminal are respectively inserted into the static contact mounting seat and the base; the upper part of the normally open static contact terminal is bent on the upper surface of the static contact mounting seat and fixedly connected with a normally open static contact; the lower part of the normally open static contact terminal is set as a normally open static contact lead pin and is disposed under one end of the length of the base; the upper part of the normally closed static contact terminal is bent above the upper part of the normally open static contact terminal and fixedly connected with a normally closed static contact; the lower part of the normally closed static contact terminal is set as a normally closed static contact lead pin and is disposed under one end of the length of the base.

[0009] The normally open static contact lead pin and the normally closed static contact lead pin are respectively on both sides of the length of the base, and the normally closed static contact lead pin and the groove and the protrusion are on the same side.

[0010] The normally open static contact terminal and the normally closed static contact terminal are respectively inserted into the static contact mounting seat and the base from top to bottom, and insertion holes are respectively provided in the static contact mounting seat and the base; the normally open static contact terminal and the normally closed static contact terminal are respectively provided with protrusions for realizing interference fit and barbs on the protrusions for preventing withdrawal after insertion at the fitting positions of the insertion holes of the base; a clearance fit is formed between the normally open static contact terminal and the normally closed static contact terminal and the insertion holes of the static contact mounting seat; an interference fit is formed between the normally open static contact terminal and the normally closed static contact terminal and the insertion holes of the base.

[0011] The relay further includes two coil terminals; the two coil terminals are respectively inserted into the base from bottom to top in a direction perpendicular to the bottom of the base; the coil terminal includes a vertically arranged winding terminal appearing in the winding window of the coil bobbin and a vertically arranged coil lead foot appearing under the base; the winding terminal and the coil lead foot of the same coil terminal are staggeredly distributed, with the winding terminal closer to the inner side and the coil lead foot closer to the outer side.

[0012] The winding terminal and the coil lead foot of the coil terminal are inserted and fixed at the base in a staggered position; a stepped socket with a stepped surface facing downwards is provided at the corresponding position of the base, and a stepped insertion part with a stepped surface facing upwards is provided at the insertion position of the coil terminal; the upper part of the stepped surface of the stepped insertion part of the coil terminal is in clearance fit with the upper part of the stepped surface of the stepped socket of the base; the lower part of the stepped surface of the stepped insertion part of the coil terminal is in interference fit with the lower part of the stepped surface of the stepped socket of the base.

[0013] The coil lead feet of the two coil terminals are in the middle of one end of the length of the base, and are staggeredly distributed with the normally open static contact lead foot and the normally closed static contact lead foot in the length direction of the base of the relay.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] 1. In the present invention, two relays in the combined relay are designed to have the same structure; and the coil lead feet and the static contact lead feet in the relay are arranged at one end of the length of the base, and the moving contact lead feet are arranged at the other end of the length of the base; on one side of the length direction of the base, a groove and a convex block are respectively provided at equal distances on both sides corresponding to the median line of the length of the base, and the groove and the convex block can be correspondingly matched; when the two relays are spliced, one of the relays is rotated 180 degrees and then paired with the other relay, so that the groove and the convex block of the base of the one relay are respectively inserted and matched with the convex block and the groove of the base of the other relay. With this structure of the present invention, two relays with the same structure can be realized with only one set of molds, which simplifies the manufacturing process and reduces the manufacturing cost; by using the 180-degree rotation and matching of the grooves and convex blocks of the two relays, the coil lead feet, the moving contact lead feet and the static contact lead feet of the two relays are staggeredly distributed in the length direction of the relay, which can effectively ensure the safety distance between the static contact lead feet and between the moving contact lead feet of the two relays. At the same time, the cooperation of the groove and the convex block can limit the two relays in three-dimensional space, simplify the structure of the outer shell, and only need to put on an outer cover, which is beneficial to the miniaturization of the product.

[0016] 2. In the present invention, arc chamfers are respectively provided on both sides of the front end in the insertion direction of the bump and the groove. With this structure of the present invention, plastic chips can be avoided when the bump and the groove are engaged.

[0017] 3. In the present invention, the normally open static contact terminal and the normally closed static contact terminal are respectively inserted into the static contact mounting seat and the base from top to bottom, and the normally open static contact terminal and the normally closed static contact terminal are designed to have a clearance fit with the insertion holes of the static contact mounting seat and an interference fit with the insertion holes of the base. With this structure of the present invention, by using the insertion method of the static contact terminals, it is convenient to adjust the contact overtravel of the normally open static contact terminal and the contact gap of the normally closed static contact terminal, which is beneficial to the miniaturization of the relay product; by using the clearance fit with the static contact mounting seat of the upper flange of the coil bobbin and the interference fit with the base, it can not only ensure the fixation of the static contact terminals, but also avoid the generation of plastic chips around the contacts.

[0018] 4. In the present invention, the coil terminal is inserted into the base from the bottom of the base upward; and the winding terminal and the coil lead-out leg of the coil terminal are staggeredly distributed, with the winding terminal close to the inner side and the coil lead-out leg close to the outer side. With this structure of the present invention, by using the staggered distribution of the winding terminal and the coil lead-out leg, the size of the length or width of the relay product can be reduced, realizing the miniaturization of the relay product, and the insertion method of the coil terminal minimizes the mating area between the coil terminal and the coil bobbin, which is beneficial to the miniaturization of the relay product.

[0019] 5. In the present invention, the coil terminal is provided with a stepped insertion portion to cooperate with the stepped insertion hole of the base, and the upper part of the stepped surfaces of the two is in clearance fit, and the lower part of the stepped surfaces of the two is in interference fit. When the coil terminal is inserted into the base from the bottom upward, the plastic chips generated due to the interference fit between the coil terminal and the base are just received at the stepped surface of the stepped insertion hole and will not enter the interior of the relay. In addition, the winding terminal of the coil terminal needs to be bent during winding. To ensure the small size of the product, it needs to be refolded after winding. Due to the upward stepped surface of the coil terminal and the downward stepped surface of the base for positioning, the mating strength between the coil terminal and the base (the lower flange of the coil bobbin) can be ensured.

[0020] The present invention will be further described in detail below with reference to the drawings and embodiments; however, a combined relay based on a dual small-sized PCB relay of the present invention is not limited to the embodiments. Description of the Drawings

[0021] Figure 1 is a three-dimensional structural schematic diagram of an embodiment of the present invention;

[0022] Figure 2 is a three-dimensional structural exploded schematic diagram of an embodiment of the present invention;

[0023] Figure 3 is a schematic three-dimensional structure diagram (bottom up) of an embodiment of the present invention;

[0024] Figure 4 is the front view of an embodiment of the present invention;

[0025] Figure 5 is a cross-sectional view along Figure 4 the A-A line in

[0026] Figure 6 is a cross-sectional view along Figure 4 the B-B line in

[0027] Figure 7 is the side view of an embodiment of the present invention;

[0028] Figure 8 is the top view of an embodiment of the present invention;

[0029] Figure 9 is the bottom view of an embodiment of the present invention;

[0030] Figure 10 is a cross-sectional view along Figure 9 the C-C line in

[0031] Figure 11 is a schematic three-dimensional structure diagram of the bobbin of an embodiment of the present invention;

[0032] Figure 12 is a schematic three-dimensional structure diagram (bottom up) of the bobbin of an embodiment of the present invention;

[0033] Figure 13 is the front view of the bobbin of an embodiment of the present invention;

[0034] Figure 14 is the top view of the bobbin of an embodiment of the present invention;

[0035] Figure 15 is a schematic three-dimensional structure diagram of the bobbin and the coil terminal of an embodiment of the present invention;

[0036] Figure 16 is a schematic diagram of the cooperation between the bobbin and the coil terminal of an embodiment of the present invention;

[0037] Figure 17 is a cross-sectional view along Figure 16 the D-D line in Detailed implementation manners

[0038] Embodiment

[0039] Refer to Figures 1 to 17As shown in the figure, a combined relay based on two small PCB relays of the present invention includes two relays 11 and 12 with the same structure and without a housing; the relay includes a base 2 and coil lead-out pins 31, moving spring lead-out pins 41, and static spring lead-out pins distributed on the base. Among them, the number of coil lead-out pins 31 is two, and the static spring lead-out pins include normally open static spring lead-out pins 51 and normally closed static spring lead-out pins 61; the projection of the base 2 on the bottom plane is rectangular in shape; the coil lead-out pins 31 and the static spring lead-out pins 51 and 61 are arranged at one end of the length of the base 2, and the moving spring lead-out pins 41 are arranged at the other end of the length of the base 2; on one side of the base 2 in the length direction, a groove 21 and a protrusion 22 are respectively provided at equal distances on both sides corresponding to the midline of the length of the base 2, and the groove 21 and the protrusion 22 can be correspondingly matched; when the two relays 11 and 12 are spliced, one of the relays is rotated 180 degrees and paired with the other relay, so that the groove 21 and the protrusion 22 of the base of the one relay are respectively inserted and matched with the protrusion 22 and the groove 21 of the base of the other relay, so that the bases of the two relays 11 and 12 are mutually limited in three-dimensional space, and the coil lead-out pins, moving spring lead-out pins, and static spring lead-out pins of the two relays 11 and 12 are misaligned in the length direction of the relay.

[0040] In this embodiment, arc-shaped chamfers 221 are respectively provided on both sides of the front end of the insertion direction of the protrusion 22, and arc-shaped chamfers 211 are respectively provided on both sides of the front end of the insertion direction of the groove 21.

[0041] In this embodiment, the relay further includes a coil bobbin 7. The coil bobbin 7 has a core mounting hole 71 for mounting a core, and the core mounting hole 71 of the coil bobbin is arranged vertically; the coil bobbin 7 has an upper flange 72 and a lower flange, and a winding window 73 is formed between the upper flange 72 and the lower flange; the lower flange of the coil bobbin 7 and the base 2 are of an integral structure (that is, the lower flange of the coil bobbin 7 is the base); the upper flange 72 of the coil bobbin 7 horizontally extends in the direction of one end of the length of the base to be provided with a static spring mounting seat 74.

[0042] In this embodiment, the relay further includes a normally open static spring terminal 5. The normally open static spring terminal 5 is inserted into the static spring mounting seat 74 on the upper flange 72 of the coil bobbin 7 and the base 2 (that is, the lower flange of the coil bobbin 7); the upper part of the normally open static spring terminal 5 is bent on the upper surface of the static spring mounting seat 74 and fixedly connected with a normally open static contact 52; the lower part of the normally open static spring terminal 5 is the normally open static spring lead-out pin 51, which is arranged below one end of the length of the base 2.

[0043] In this embodiment, the relay further includes a normally closed static reed terminal 6, which is inserted into the static reed mounting seat 74 and the base 2; the upper part of the normally closed static reed terminal 6 is bent above the upper part of the normally open static reed terminal 5 and fixedly connected with a normally closed static contact 62; the lower part of the normally closed static reed terminal 6 is a normally closed static reed lead-out foot 61, which is arranged under one end of the length of the base 2.

[0044] In this embodiment, the normally open static reed lead-out foot 51 and the normally closed static reed lead-out foot 61 are respectively located on both sides of the length of the base 2, and the normally closed static reed lead-out foot 61 and the groove 21 and the convex block 22 are on the same side.

[0045] In this embodiment, the normally open static reed terminal 5 and the normally closed static reed terminal 6 are respectively inserted into the static reed mounting seat 74 and the base 2 from top to bottom. Plugging holes 741 and plugging holes 23 are respectively provided in the static reed mounting seat and the base; the normally open static reed terminal 5 and the normally closed static reed terminal 6 are respectively provided with convex buds 53 and 63 for achieving interference fit at the fitting positions with the plugging holes of the base, and barbs for preventing withdrawal after insertion on the convex buds; there is a clearance fit between the normally open static reed terminal 5, the normally closed static reed terminal 6 and the plugging holes 741 of the static reed mounting seat 74; there is an interference fit between the normally open static reed terminal 5, the normally closed static reed terminal 6 and the plugging holes 23 of the base 2.

[0046] In this embodiment, the relay further includes two coil terminals 3; the two coil terminals 3 are respectively inserted into the base 2 from bottom to top in a direction perpendicular to the bottom of the base 2; the coil terminal 3 includes a winding terminal 32 arranged vertically in the winding window 73 of the coil bobbin and the coil lead-out foot 31 also arranged vertically under the base; the winding terminal 32 and the coil lead-out foot 31 of the same coil terminal are staggeredly distributed, and the winding terminal 32 is close to the inner side and the coil lead-out foot 31 is close to the outer side.

[0047] In this embodiment, the staggeredly arranged winding terminal 32 and coil lead-out foot 31 of the coil terminal 3 are inserted and fixed at the base 2; a stepped jack 25 with a stepped surface 24 facing downwards is provided at the corresponding position of the base 2, and a stepped plugging portion 33 with a stepped surface 331 facing upwards is provided at the plugging position of the coil terminal 3; the upper part 332 of the stepped surface 331 of the stepped plugging portion 33 of the coil terminal 3 and the upper part 251 of the stepped surface 24 of the stepped jack 25 of the base 2 are in clearance fit; the lower part 333 of the stepped surface 331 of the stepped plugging portion 33 of the coil terminal 3 and the lower part 252 of the stepped surface 24 of the stepped jack 25 of the base 2 are in interference fit.

[0048] In this embodiment, the coil lead-out feet 31 of the two coil terminals 3 are located in the middle of one end of the length of the base 2, and are misaligned with the normally open static reed lead-out foot 51 and the normally closed static reed lead-out foot 61 in the length direction of the base 2 of the relay.

[0049] A combined relay based on two small PCB relays of the present invention adopts the design that the two relays 11 and 12 in the combined relay have the same structure; and the coil lead-out feet 31, the static reed lead-out feet 51 and 61 in the relay are arranged at one end of the length of the base 2, and the moving reed lead-out foot 41 is arranged at the other end of the length of the base 2; on one side in the length direction of the base 2, a groove 21 and a convex block 22 are respectively provided at equal distances on both sides corresponding to the midline of the length of the base 2, and the groove 21 and the convex block 22 can be correspondingly matched; when the two relays 11 and 12 are spliced, one of the relays is rotated 180 degrees and then paired with the other relay, so that the groove 21 and the convex block 22 of the base of the one relay are respectively inserted and matched with the convex block 22 and the groove 21 of the base of the other relay. With this structure of the present invention, two relays with the same structure can be realized with only one set of molds, which simplifies the manufacturing process and reduces the manufacturing cost; by using the 180-degree rotational fit of the grooves 21 and the convex blocks 22 of the two relays, the coil lead-out feet 31, the moving reed lead-out feet 41, and the static reed lead-out feet 51 and 61 of the two relays are misaligned in the length direction of the relay, which can effectively ensure the safety distance between the static reed lead-out feet and between the moving reed lead-out feet of the two relays. At the same time, the cooperation of the groove and the convex block can limit the two relays in three-dimensional space, simplify the structure of the outer shell, and only need to put on an outer cover, which is beneficial to the miniaturization of the product.

[0050] A combined relay based on two small PCB relays of the present invention adopts the design that arc-shaped chamfers 221 and 211 are respectively provided on both sides of the front end in the insertion direction of the convex block 22 and the groove 21. With this structure of the present invention, plastic chips can be avoided when the convex block 22 and the groove 21 are matched.

[0051] A combined relay based on a dual small PCB relay of the present invention adopts the method of inserting the normally open static contact terminal 5 and the normally closed static contact terminal 6 vertically downward into the static contact mounting seat 74 and the base 2 respectively, and the normally open static contact terminal 5 and the normally closed static contact terminal 6 are designed to have a clearance fit with the insertion holes 741 of the static contact mounting seat 74 and an interference fit with the insertion holes 23 of the base 2. With this structure of the present invention, by using the insertion method of the static contact terminals, it is convenient to adjust the contact overtravel of the normally open static contact terminal and the contact gap of the normally closed static contact terminal, which is beneficial to the miniaturization of the relay product; by using the clearance fit with the static contact mounting seat of the upper flange of the coil holder and the interference fit with the base, it can not only ensure the fixation of the static contact terminals, but also avoid the generation of plastic debris around the contacts.

[0052] A combined relay based on a dual small PCB relay of the present invention adopts the method of inserting the coil terminal 3 vertically upward from the lower part of the base 2 at the base 2; and the winding terminal 32 and the coil lead-out foot 31 of the coil terminal 3 are arranged in a staggered manner, with the winding terminal 32 close to the inner side and the coil lead-out foot 31 close to the outer side. With this structure of the present invention, by using the staggered distribution of the winding terminal 32 and the coil lead-out foot 31, the size of the length or width of the relay product can be reduced, realizing the miniaturization of the relay product, and the insertion method of the coil terminal makes the mating area between the coil terminal and the coil holder the smallest, which is beneficial to the miniaturization of the relay product.

[0053] A combined relay based on a dual small PCB relay of the present invention adopts the method that the coil terminal 3 is provided with a stepped insertion part 33 to cooperate with the stepped insertion hole 25 of the base 2, and the upper part of the stepped surfaces of the two is in clearance fit, and the lower part of the stepped surfaces of the two is in interference fit. When the coil terminal 3 is inserted vertically upward from the lower part of the base, the plastic debris generated due to the interference fit between the coil terminal 3 and the base is just received at the stepped surface 24 of the stepped insertion hole 25 and will not enter the interior of the relay. In addition, the winding terminal 32 of the coil terminal needs to be bent during winding. To ensure the small size of the product, it needs to be folded back after winding. Since there is the upper stepped surface 331 of the coil terminal limiting with the lower stepped surface 24 of the base, the mating strength between the coil terminal and the base (the lower flange of the coil holder) can be ensured.

[0054] The above are only the preferred embodiments of the present invention and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above in the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above, or modify it into equivalent equivalent embodiments. Therefore, all simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. A combined relay based on two small PCB relays, characterized in that: it includes two relays with the same structure and without a housing; the relay includes a base; the projection of the base on the bottom plane is rectangular; on one side of the base in the length direction, a groove and a protrusion are respectively provided at equal distances on both sides corresponding to the median line of the length of the base, and the groove and the protrusion can be correspondingly matched; when the two relays are spliced, one of the relays is rotated 180 degrees and paired with the other relay, so that the groove and the protrusion of the base of one of the relays are respectively inserted and matched with the protrusion and the groove of the base of the other relay, so that the bases of the two relays are mutually limited in three-dimensional space; the relay also includes coil lead-out pins, moving spring lead-out pins and static spring lead-out pins distributed on the base; the coil lead-out pins and the static spring lead-out pins are arranged at one end of the length of the base, and the moving spring lead-out pins are arranged at the other end of the length of the base; when the groove and the protrusion of the base of one of the relays are respectively inserted and matched with the protrusion and the groove of the base of the other relay, the coil lead-out pins, the moving spring lead-out pins and the static spring lead-out pins of the two relays are misaligned in the length direction of the relay.

2. The combined relay based on two small PCB relays according to claim 1, characterized in that: arc-shaped chamfers are respectively provided on both sides of the front end of the insertion direction of the protrusion and the groove.

3. The combined relay based on two small PCB relays according to claim 1, characterized in that: the relay also includes a coil bobbin, the coil bobbin has a core mounting hole for mounting a core, and the core mounting hole of the coil bobbin is arranged vertically; the coil bobbin has an upper flange and a lower flange, and a winding window is formed between the upper flange and the lower flange; the lower flange of the coil bobbin and the base are of an integral structure; the upper flange of the coil bobbin horizontally extends towards one end of the length of the base and is provided with a static spring mounting seat.

4. The combined relay based on two small PCB relays according to claim 3, characterized in that: the relay also includes a normally open static spring terminal and a normally closed static spring terminal, and the normally open static spring terminal and the normally closed static spring terminal are respectively inserted into the static spring mounting seat and the base; the upper part of the normally open static spring terminal is bent above the static spring mounting seat and fixedly connected with a normally open static contact; the lower part of the normally open static spring terminal is set as a normally open static spring lead-out pin and is arranged below one end of the length of the base; the upper part of the normally closed static spring terminal is bent above the upper part of the normally open static spring terminal and fixedly connected with a normally closed static contact; the lower part of the normally closed static spring terminal is set as a normally closed static spring lead-out pin and is arranged below one end of the length of the base.

5. The combined relay based on two small PCB relays according to claim 4, characterized in that: the normally open static spring lead-out pin and the normally closed static spring lead-out pin are respectively on both sides of the length of the base, and the normally closed static spring lead-out pin and the groove and the protrusion are on the same side.

6. The combined relay based on a dual small-sized PCB relay according to claim 5, characterized in that: the normally open static contact terminal and the normally closed static contact terminal are respectively inserted into the static contact mounting base and the base from top to bottom, and insertion holes are respectively provided in the static contact mounting base and the base; the normally open static contact terminal and the normally closed static contact terminal are respectively provided with convex buds for achieving interference fit and barbs on the convex buds for preventing withdrawal after insertion at the fitting positions of the insertion holes of the base; the normally open static contact terminal and the normally closed static contact terminal are in clearance fit with the insertion holes of the static contact mounting base; the normally open static contact terminal and the normally closed static contact terminal are in interference fit with the insertion holes of the base.

7. The combined relay based on a dual small-sized PCB relay according to claim 1, characterized in that: the relay further includes two coil terminals; the two coil terminals are respectively inserted into the base from bottom to top in a direction perpendicular to the bottom of the base; the coil terminal includes a vertically arranged winding terminal appearing in the winding window of the coil bobbin and the coil lead-out leg also arranged vertically and appearing under the base; the winding terminal and the coil lead-out leg of the same coil terminal are staggeredly distributed, and the winding terminal is closer to the inner side and the coil lead-out leg is closer to the outer side.

8. The combined relay based on a dual small-sized PCB relay according to claim 7, characterized in that: the staggeredly arranged positions of the winding terminal and the coil lead-out leg of the coil terminal are inserted and fixed at the base; a stepped jack with a downward-facing stepped surface is provided at the corresponding position of the base, and a stepped insertion portion with an upward-facing stepped surface is provided at the insertion position of the coil terminal; the upper part of the stepped surface of the stepped insertion portion of the coil terminal is in clearance fit with the upper part of the stepped surface of the stepped jack of the base; the lower part of the stepped surface of the stepped insertion portion of the coil terminal is in interference fit with the lower part of the stepped surface of the stepped jack of the base.

9. The combined relay based on a dual small-sized PCB relay according to claim 7, characterized in that: the coil lead-out legs of the two coil terminals are in the middle of one end of the length of the base, and are staggeredly distributed with the normally open static contact lead-out leg and the normally closed static contact lead-out leg in the length direction of the base of the relay.

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